Title of Invention	A STYTEM FOR BATCH PRODUCTION OF SPONGE IRON FROM IRON ORE AND A METHOD FOR PRODUCING SPONGE IRON USING SUCH SYSTEM.
Abstract	A system and method for bateh manufacture of Sponge Iron from Iron Ore and in particular to a low cost simple system and method of batch manufacture of such Sponge Iron from Iron Ore involving low capital cost and yet suitable for manufacture of Sponge Iron from both Hematite (Fe2O3) Iron Ore as well as Magnetite (Fe3O4) Iron Ore and even from iron ore fines of less than 5 mm apart from the usual sponge grade iron ore of 5-18mm sizes. The system and the method basically simply requires at least one Jala adapted for heating the iron ore in me presence of a reductant and container means adapted to be disposed inside said kiln to ensure compact and atmospheric oxygen / air free contact of said iron ore and reductant in said containers in the kiln in the temperature sufficient to thereby effect the reduction of iron ore to sponge iron. The system and the method used is environment friendly and advantageously can be adapted and used even in remote locations with scarcity or even no power supply .The invention is thus directed to a cost effective alternative to the complex and capital intensive rotary kiln based or gas based manufacture of Sponge Iron presently in use.

Title of Invention

A STYTEM FOR BATCH PRODUCTION OF SPONGE IRON FROM IRON ORE AND A METHOD FOR PRODUCING SPONGE IRON USING SUCH SYSTEM.

Abstract

A system and method for bateh manufacture of Sponge Iron from Iron Ore and in particular to a low cost simple system and method of batch manufacture of such Sponge Iron from Iron Ore involving low capital cost and yet suitable for manufacture of Sponge Iron from both Hematite (Fe2O3) Iron Ore as well as Magnetite (Fe3O4) Iron Ore and even from iron ore fines of less than 5 mm apart from the usual sponge grade iron ore of 5-18mm sizes. The system and the method basically simply requires at least one Jala adapted for heating the iron ore in me presence of a reductant and container means adapted to be disposed inside said kiln to ensure compact and atmospheric oxygen / air free contact of said iron ore and reductant in said containers in the kiln in the temperature sufficient to thereby effect the reduction of iron ore to sponge iron. The system and the method used is environment friendly and advantageously can be adapted and used even in remote locations with scarcity or even no power supply .The invention is thus directed to a cost effective alternative to the complex and capital intensive rotary kiln based or gas based manufacture of Sponge Iron presently in use.

Full Text	Field of the Invention The present invention relates to a system for batch manufacture of Sponge lion from iron Ore and in particular to a low cost simple system and method of batch manufacture of such Sponge Iron from Iron Ore involving tow capital cost and yet suitable for manufacture of Sponge Iron from both Hematite (Fe2O3) Iron Ore as well as Magnetite (Fe3O4) Iron Ore and even from iron ore fines of less than 5 mm apart from the usual sponge grade iron ore of 5-18mm sizes The system and the method used is environment friendly and advantageously can be adapted and used even in remote locations with scarcity or even no power supply .The invention is thus directed to a cost effective alternative to the complex and capital intensive rotary kiln based or gas based manufacture of Sponge Iron presently in use. Background Art Sponge lion is basically Direct Reduced Iron (DRI) and is the product obtained from direct reduction of Iron Ore. Usually, in the reduction process the Oxygen in the Iron Ore is eliminated leaving void space and the whole mass becomes porous and spongy. Sponge Iron is widely applicable in the Steel Industry as an important raw material for steel making via the Electric Arc Furnace (EAF) and the Induction Furnace (IF) routes substituting and supplementing scrap of iron and steel. Presently there are two main technologies for producing Sponge Iron (i) Gas based and pi) Coal based. The gas-based method involves several alternative technologies and any generalization of the gas based method is not possible. In one such process popularly known as "Midrex process", the gas based system is continuous, moving bed process which converts Iron Oxide (Lump/pellets) into Direct Reduced Iron (DRI) at elevated pressure and predetermined temperature under the reducing action of a hydrogen and carbon monoxide (CO) gas mixture produced by natural gas / steam reforming. IN 191425 discloses a process for producing Sponge Iron from particulate iron oxide containing ore characterized by the steps of reducing the iron ore containing ore to Sponge Iron in a reduction zone by reacting the iron oxide containing material with a reducing gas, withdrawing the gas formed during reduction from the reduction zone as a top gas, subjecting the top gas to CO2 purification thereby forming a CQ2 containing off gas and purified top gas, mixing the CO2 containing off gas and a purified top gas and burning it, supplying the thermal energy produced by the CO2 containing off gas to a consumer and recovering the sponge iron obtained in the first step from the reduction zone. In the coal based method of producing Sponge Iron the same involves reducing iron ore (lump/pellets) with carbonations material like coal or lignite. The reduction process is carried out in a shaft furnace or rotary furnace at stipulated temperature in the range of 850°C-1050°C. The reduced iron from the furnace is cooled and the cool product alter being discharged is next subjected to product separation and handling. Magnetic separators are used to separate the magnetic component from the non-magnetic ingredients. US 4.362554 disclose a method and apparatus for manufacturing sponge iron by the continuous reduction of iron oxides in a shaft utilizing recirculation gases. Reaction gas is removed from the shaft furnace, substantially cleaned of all CO2 and H2O and then divided into at least two flow portions one of which is passed to a gas generator comprising a plasma burner A reducing agent such as pit coal is injected together with an oxidant into the hot gas from the plasma burner so as to form a gas mixture comprised primarily of CO and H2, which gas mixture is then mixed with the other flow portion of the cleaned reaction gas in such proportion that the temperature of the resulting reduction gas is suitable for the reduction of iron oxides in the shaft furnace. US 4,362,555 discloses a method and apparatus for manufacturing sponge iron by the continuous reduction of iron oxides in a shaft utilizing recirculation gases. Reaction gas is removed from the shaft furnace, substantially cleaned of all CO2 and H2O, and then divided into at least two flow portions one of which is passed to a gas generator comprising a gas generating shaft substantially filled with a solid reducing agent and a plasma burner arranged in the lower portion of said shaft. An oxidant is injected into the hot gas from the plasma burner so as to form a gas mixture comprised primarily of CO and H 2, which gas mixture is then mixed with the other flow portion of the cleaned reaction gas in such proportion that the temperature of the resulting reduction gas is suitable for the reduction of iron oxides in the shaft furnace. 4 IN 191759 discloses a device for producing Sponge Iron from lumps of Iron Oxide in a reduction shaft comprising (1) using a hot dust containing an Carbon Monoxide(CO) rich reduction gas, the reduction is produced in a gas generator by partial oxidation of solid carbon containing material and introduced via a plurality of lateral reduction gas inlets arranged at the same level on the circumference of the reduction shaft, into the reduction shaft at the tower end of the reduction zone and iron oxide lumps are entered in the upper area of the reduction shaft and its lower end discharged as Sponge iron characterized in that below the level of lateral gas inlets are provided additional reduction gas inlets in the form of at least one channel which is over its length downwardly opened and extends from the outside into the radically central area of the reduction shaft. US4469509 discloses operation of the rotary kitn provided at its charging end with a central burner, solid reducing agents having a high content of volatile constituents are used and the charge and the gas atmosphere are conducted in cocurrent streams. To avoid a high heat bad per unit of volume in the heating-up zone and yet to increase the heating-up rate, a solid carbonaceous reducing agent having a high content of volatile constituents is charged together with the iron oxide-containing material into the charging end of the rotary kiln, oxygen-containing gases are blown through nozzle blocks into the free gas space and into the charge in the heating-up zone, and oxygen-containing gases are blown through nozzle blocks into the free kiln space in the reducing zone. WO 02/064844 A1 discloses a method for producing sponge iron wherein iron oxide is reduced through heating together with a solid reducing agent to form sponge iron, characterized in that a mixed powder of a hematite powder and an iron ore powder or a mixed powder of hematite powder and a mill scale powder is used as iron oxide and the hematite powder has a specific surface area of 2.0 m2/g or more and is used in an amount of 5 to 45mass % based on the total amount of the iron oxide. Swedish Pat. No. 73 04 322-5, describes of directly gassifying coal in solid form using a plasma generator. This process essentially requires that the supply of coal must be extremely accurately adjusted and for some grades of coal there are problems in handling the ash. Moreover, the gas produced has a hydrogen content which is lower than the ideal for reduction purposes. 5 The drawbacks with the above known coal based methods of producing sponge iron are primarily the extremely high investment cost and also the exceptionally high energy consumption or the limitations in charge characteristics for effective reduction of the ore. In particular the rotary furnace method involves pit coal together with the ore to be reduced, in an inclined rotary furnace. Such rotary furnace involving coal based system of manufacture of Sponge Iron from Iron Ore is complex and cost extensive and essential involves lot of power consumption by way of achieving the rotary motion of the kiln in the continuous process of reduction of the Ore. Moreover, apart from being capital intensive such coal based method / system involving the rotary kiln is essentially also complex to install involving huge installation space and skilled manpower to handle and iise. The demands of the steel industry for sponge iron which is ever increasing make it essential to look for alternative methods and system of manufacture of sponge iron which could avoid the complexities and capital intensive approach to manufacture of sponge iron by way of some simple and cost effective system / technique which could be widely adapted and used even in remote locations with scarcity or even no power sources/supply. Objects of the Invention It is thus the basic object of the present invention, to provide a simple and cost effective alternative to the complex and capital extensive rotary kiln based manufacture of sponge iron which would be simple, cost effective and convenient to operate / use and can be provided in remote locations for wide scale cost effective manufacture of Sponge Iron to meet the present day growing demands of sponge iron in the Steel Industry. The other object of the present invention is to provide for a system and the method for batch production of sponge iron from a iron ore which would be simple and cost effective and at the same time workable to produce sponge iron from both the iron ore sources Hematite (Fe2O3) and Magnetite (Fe3O4). Another object of the present invention is to provide for a system and method for batch producing of sponge iron from iron ore, which can be adapted by the small scale industry with -6- low investments and favour advantageous use of cost effective kilns such as low cost coal fired down draft kilns. Yet another object of the present invention is to provide for the much required system and method for small scale batch production of sponge iron involving less risk by way of smaller charge and also adapted for generation of sponge iron from low cost iron ore such as those available in sizes of 3-5 mm which are cheaper than the usual sponge grade iron ore of 5-18 mm which are expensive thereby favoring the use of iron ore fines and waste in generation of sponge iron. Yet further object of the present invention is directed to a system and method for manufacture of sponge iron, which would yield greater realization value in terms of conversion of cost effective 3-5 mm size Sponge Iron as compared to 5-18 mm size Sponge Iron. Yet further object is to provide for a system and method for generation of Sponge Iron, which would enable advantageous utilizes of cost effective labour in lieu of capital and cost extensive power consumption in remote locations having scarcity of power and skilled manpower. Yet another object of the present invention is to provide for a method and system for batch manufacture of sponge Iron in batches such as 1-10 Tons per day depending upon the intended capacity. Yet further object of the present invention is to provide a system and the method for use in manufacture of sponge iron, which can be carried out in remote locations involving low power or less consumption of power. Yet further object is directed to provide for a system and method for manufacture of sponge iron, which would be the environment friendly and would be less polluting. Summary of the Invention Thus in accordance with the basic aspect of the present invention there is provided A system for batch production of sponge iron from iron ore comprising : a kiln adapted for heating at temperature sufficient to thereby effect the reduction of the iron ore to sponge iron in the presence of reductant such as hereindescribed; plurality of atmospheric oxygen/air proof refractory container disposed in vertically aligned column or plurality of columns inside the kiln to ensure uniform heating and compact and atmospheric oxygen /air free contact of said iron ore and reductant in said vertically aligned containers inside the kiln at temperature sufficient to thereby effect the said reduction of the Iron ore to sponge iron. oxygen / air proof refractory containers. Depending upon the characteristic of the charge and the contents, and to meet the requirement of uniform heating of the charge, the charge can be loaded and selectively disposed in plurality of such refractory containers in said kiln. Importantly, to ensure effective heating and atmospheric oxygen / air proof characteristic, the said refractory containers and in particular the internal face thereof is coated with ceramic glaze to reduce pores and to ensure proper reducing atmosphere. Moreover, as a further precaution / protection, a protective internal wall member is provided to further prevent entry of atmospheric air / oxygen into the container. Such protective internal wall can be selected from cardboard , Mild Steel Sheet (MS Sheet), and the like of dimensions preferably of thickness in the range of 2 to 10 mm. In accordance with one aspect the refractory container can comprise saggers having a diameter in range of 4-24 inches and the height in the range of 3-24 inches. The kiln can be selected from any conventional kiln preferably coal fired down draft kilns, coal fire up draft kilns, clown draft chamber kilns, oil fired or gas fired tunnel kilns and shuttle kilns. The reductant charge can comprise coal dust with or without other additives selected from Dolomite or Umestone,NaNO3 (Sodium Nitrate) and K2CO3(Potassiurrr carbonate) in desired proportions. The coal dust used is preferably coal dust having carbon content 25-70% or any other fixed carbon content materials like Graphite and Charcoal having carbon content 25-70%. The iron ore and the reductant charge are mixed and loaded in the container saggers in selective proportions. In accordance with a preferred aspect 62% - 66% Fe, 50-70% coal dust is mixed with iron ore by weight along with 5%-10% of Dolomite or Lime stone. The system further involves means for unloading of the refractory containers saggers containing the reduced sponge iron. In accordance with one aspect such means for unloading of the sponge iron comprise: 8 at least bne container means for collecting the sponge iron dispensed from the respective saggers under gravity; at least one stand means having the sponge iron release platform with gate / cut out portion selectively disposed such that the saggerifmsans>hen traversed over said platform the sponge iron is dispensed under gravity through the cut out portion in said platform into the said sponge iron container. In accordance with another aspect the means for unloading of the of the sponge iron comprises atias one movable stand means having a sponge-iron release platform with gates/cut out portionfor selective disposition inside said kiln with respect to the sagger columns comprising mostly of baseless saggers arranged one above the other and only the lowermost sagger having a base such that the respective baseless sagger means when traversed over said platform one by one starting from the topmost the sponge iron is discharged under gravity through the gate/cut out portion in said platform of the unloading means. In accordance with another aspect the said stand means for unloading can be adapted such that sponge iron from a plurality of vertically aligned saggers can be unloaded by first unloading the topmost sagger followed by the saggers there under one by one, said platform being adapted for height adjustment at the level of the base of the sagger to be unloaded. The system for batch production of sponge iron further includes means for magnetic separation of the sponge iron, ash and un-bumt coat dust- In accordance with a preferred aspect, the system for batch production of sponge iron from iron ore in accordance with the invention comprises: at least ,dne kiln adapted for heating the iron ore in the presence of a reductant; means for ensuring compact and at atmospheric oxygen / air free contact of the said iron ore and reductant comprising providing the said iron ore and the reductant in said kiln loaded in plurality of atmospheric oxygen / air proof refractory containers / staggers in vertically aligned columns within said kiln; the refractory containers / saggers having an internal space coated with ceramic glaze to reduce pores and ensure proper reducing atmosphere inside and a protective internal wall member selectively obtained of card board, Mild Steel sheet and the like of dimension preferably of thickness in the range of 2 to 10 mm; 9 moans for unloading of the reduced sponge iron from the said refractory containers / saggers outside said kilns; and means-for magnetic separation of the reduced sponge iron from ash and un-bumt coal dust. In accordance with yet another aspect, the system for batch production of sponge iron from iron ore comprises: at least one kiln adapted for heating the iron ore in the presence of the reductant; said means for ensuring compact and atmospheric oxygen / air free contact of the said iron ore and the reductant comprising providing the said iron ore and reductant in said kiln loaded in plurality of atmospheric oxygen / air proof refractory containers/saggers in vertically aligned columns within said kiln; said refractory container having an internal face coated with ceramic glazed to reduced pores and to ensure proper reducing atmosphere inside and the protective wall member selectively obtained of cardboard, Mild Steel sheet, and the like of dimensions preferably of thickness in the range of 2to10mm; means for mechanized pneumatic and/ or gravity based material handling for loading of charge into said refractory containers / saggers and / or unloading of Ihe reduced sponge iron from the said refractory containers / saggers to outside said kiln; means,for magnetic separation of the reduced sponge iron from ash, and un-bumt coal dust. In accordance with another aspect of the present invention the system for batch production of sponge iron comprises: atleastone kiln adapted for heating the iron ore in the presence! of a reductant; container means adapted to be disposed inside said kiln to ensure compact and atmospheric oxygenlair free contact of said iron ore and the reductant in said container in the kiln in the temperature range of 900-1180°C or less if use of K2CQ3 (Potassium Carbonate) or NaNO3 (Sodium Nitrate ) is made comprising an arrangement of atleast one column of vertically aligned and disposed plurality of saggers positioned one over the other such that only the lowermost of the saggers is provided with a base member while the other saggers above said lowermost sagger are free of any base to together define a hollow cylindrical internal space for storage of said iron ore and the reductant mix therein; atleast one of the said saggers atop the lowermost within the lower half of the sagger column preferably between the 2-4th saggers from the lower end provided with a releasable opening adapted to be opened or closed by refractory based stopper means; 10 means tor unloading of the sponge iron generated in said saggers comprising said reteasable stoppered sagger adapted for release of the stopper on cooling of the contents for gravity based release of the contents through said opening within said kiln and release of the contents from the saggers thereunder said stoppered sagger by manual upside down unloading; and means for subjecting the sponge iron generated to magnetic separation and screening. In the above embodiment the stopper means is preferably selected of refractory material such as siiicone carbide based materials to ensure compact housing of the content inside the saggers for the reduction at elevated temperature Following the above system it is possible to make the batch process of the invention less labour intensive by way of a semi-continuous and effective manner of handling of charge and the produce of sponge irons In accordance with yet another aspect of the present invention there is provided a method for batch production of sponge iron from iron ore using the above system comprising: providing at least one kiln adapted for heating the iron ore in the presence of reductent and providing the charge of iron ore and reductant in a compact and atmospheric oxygen / air free contact in container means inside said kiln and heating in the temperature range sufficient to thereby effect the reduction of iron ore to sponge iron. In the above method the iron ore and the reductant charge are mixed and loaded in said refractory container / saggers in selective proportion / ranges. In accordance with the preferred aspect 62%-66% Fe, 50%-70% Coal dust is mixed with Iron Ore by weight along with 5%-10% of Dolomite or Limestone and contained in said refractory containers / saggers. The heating of the charge in the above method can be carried out in the kilns by operating the kilns at varying firing cycles from 17 hrs. to 32 hrs. After the firing is completed upon completion of the reduction, the reduced sponge iron is allowed to cool for cooling cycle of 10-50 hrs. After the cooling the saggers are taken out of the kiln and the contents unloaded using the unloading means. Finally, the sponge iron is separated from ash and un-bumt coal dust by magnetic separation means and the sponge iron is packed in bags. 11 In accordance with another aspect of the invention the method for batch production of sponge iron comprises providing at least one kiln adapted for heating the iron ore in presence of reductant; providing compact refractory container / sagger means containing the charge of iron ore and the reductant means in desired proportion inside said kiln and heating in the temperature range of 900°C - 1180°C or less if use of K2CO3 (Potassium Carbonate) or NaNO3 (Sodium Nitrate) is made to effect the reduction of iron ore to sponge iron; pneumatic and/or gravity feed material handling for initial loading of charge into said refractory container / saggers disposed in kiln and / or subsequent unloading of the reduced sponge iron from said refractory containers / saggers to outside said kiln; and magnetic separation of the sponge iron from the ash and un-bumt coal. In the above system and method of the invention It is also possible to introduce the saggers loaded with the ore-charge mix in the kilns by hand driven or motor driven trollies. Similarly, after the reduction is over the saggers for the purpose of unloading can be taken out of the kilns also by use of such hand or motor driven trollies., Brief description in relation to the accompanying figures The details of the invention is objects and advantages are explained hereunder in greater detail in relation to non-limiting exemplary illustrations of the system tor batch production of sponge iron from iron ore as per the accompanying figures wherein: Figure 1 illustrates in section a kiln for use in the system for such batch production of Sponge Iron; Figure 2 is an isometric view of a down draft kiln also showing the disposition of saggers in plurality of vertical columns inside the kiln tor effective loading of charge for the reduction. Figure 3 illustrates the ring sagger, handi sagger and tile used in the system tor loading of charge Figure 4 is a schematic illustration of an embodiment of the unloading device in accordance with present invention; 12 Figure 5 is an illustration of arrangement of saggers involving atleast one stoppered sagger for unloading in accordance with an aspect of the invention; Figures 5A and 5B show embodiments of stoppered sagger having the stopper means to facilitate the unloading by gravity and the stopper for such stoppered saggers, As illustrated in said figure 1 the refractory kiln can be any conventional kiln such as coal fired down draft kiln, coal fire up draft kiln, down draft chamber kilns, oil fire or gas fire tunnel kiln and shuttle kilns. The kiln should be adapted for firing cycles of 17 hrs. to 32 hrs. in the temperature range preferably of 900°C to 1180°C or less if use of K2CO3 (Potassium Carbonate) or NaNO3 (Sodium Nitrate) is made, As also illustrated in said figure 1, the kiln is basically a dome shaped housing provided with refractory linings (RL) .A flue gas passage (FGP) is shown which is operativefy connected to a chimney means (CM).The kiln is provided with door means (DM) for allowing the containers/saggers into the kiln for reduction and to be taken out when the reduction process is over. The fire box (FB) for heating of the kiln is also shown in the figure.The kiln height, wall thickness, sizes of fire boxes ,door height and chimney height can be selected based on the kiln performance desired). The method of batch production of sponge iron using the above kiln involves providing of the iron ore, Dolomite or Limestone and coal dust having carbon content 25-70%1x any other fixed carbon containing material like Graphite and charcoal having carbon content 25-70% as reductant in refractory containers / saggers within said kiln. The iron ore and coal dust along with Limestone / Dolomite are mixed with suitable composition within the given range to form the charge and mixture is then placed in said refractory containers known as saggers and loaded inside the kiln. Importantly, as clearly illustrated in Figure 2, for effective heating of the charge and reductant, the saggers (SG) are placed one above the other in vertically aligned columns within the kiln. The saggers are usually can have diameters varying from 4-24 inches and height of 3-24 inches depending on the characteristic of the ore and the reductant used to provide atmospheric air / oxygen proof containment of the charged in the saggers. The saggers are 13 further coated with ceramic glazed to reduce the pones of the saggers to make proper reducing atmosphere. Also prior to loading of the saggers, a protective wait obtained of cardboard or Mild Steel sheet is provided along with internal face. Illustrations of such saggers are provided in the accompanying Figure 3.Figure 2 also illustrates the door means (DM) and the refractory linings obtained of refractory bricks (RB).Further, the fire place (FP), the fire box (FB) and the openings at the top of the dome shaped kiln top are illustrated in the figure. After completion of loading of the charge in said refractory containers in vertically aligned columns inside the kiln as shown in figure 2, the doors of the kiln are closed with refractories and firing is done by charging of coal in the fire boxes (FB) attached with kilns. The firing cycle can vary from 17 hrs. - 32 hrs. and after the reduction is completed, the content in the refractory containers / saggers are allowed to cool following a cooling cycle in the range of 10-50 hrs. depending upon the size of kiln and the process involved. Alter the cooling is achieved the unloading the saggers can be done manually, by using an unloading means as also illustrated in Figure 4. As shown in Figure 4 the unloading means comprises of the container (CO) for containing the gravity based unloading of the contents from the saggers (SG) .For the purpose the unloading means includes a stand means (SM). The stand means (SM) involves a sponge iron release platform (PF) with gate / cut out (COUJ portion selectively disposed such that the sagger means (SG) when traversed over said platform (PF) ,the sponge iron is dispensed under gravity through the cut out (COU) portion of the said platform (PF) into the said sponge iron container fn accordance with another aspect, the stand means used can be adapted such that the sponge iron from plurality of vertically aligned saggers can be unloaded one after the other by first unloading the topmost sagger followed by me saggers there under one by one, said platform being adapted lor height adjustment at the level of the base of sagger to be unloaded. To facilitate the unloading process, the platform of the stand means having said gate / cut out is provided with an outer edge facing the saggers of a semi-circular type matching the outer profile of the saggers. 14 After the unloading is completed, the contents are passed through screens and magnetic separation of sponge iron, ash and un-bumt coal dust Thereafter the sponge iron is packed in bags and transported for subsequent application. As also discussed, the manual process of loading and unloading can be further attended, if required, following a mechanical process to make it less labor intensive. For the purpose the bins can be prepared at top of the kiln for gravity discharge and after firing by using pneumatic material handling system removal of material from the saggers can be attended. Reference is now invited to figure 5 which shows an arrangement of vertically aligned sagger (SG)column involving a stoppered sagger (SSG). The stoppered sagger is shown more clearly in accompanying figure 5A with the stopper removed and the stopper opening (SO) being, visible. The stopper means is shown in greater detail in figure 5B.ln such arrangement involving stoppered saggers, while unloading subsequent to cooling, the stopper (ST) is simply opened when the contents from the stoppered sagger and above are released by gravity through the said opening(SO). After the major portion of the contents in the sagger column is thus unloaded the saggers are manually removed and the contents from the saggers below the stoppered sagger is /are unloaded simply by manually displacement /turning up side down It is thus possible by way of the above disclosed system and method of batch process for manufacture of sponge iron to provide for a simple, cost effective and user friendly manufacturing of sponge iron in the small scale sector to meet the large scale present day demand of sponge iron by way of an alternative to the capital intensive and complex rotary kiln based reduction system presently in use. The system can be provided in remote locations where there is scarcity or even no availability of power to operate complex and capital intensive rotary kilns to favour wide scale cost effective manufacture of sponge iron to meet the present day growing demands of sponge iron in the Steel Industry.Importantly, the system is workable to produce sponge iron from both the iron ore sources Hematite (Fe2O3)and Magnetite (Fe3O4) and even favours utilization of iron ore fines and waste in generation of sponge iron Importantly, the system and method for manufacture of sponge iron disclosed above would also be environment friendly. We Claim: 1. A (system for batch production of sponge iron from iron ore comprising : a kiln adapted for heating at temperature sufficient to thereby effect the reduction of the iron ore to sponge iron in the presence of reductant such as hereindescribed; plurality of atmospheric oxygen/air proof refractory container disposed in vertically aligned column or plurality of columns inside the kiln to ensure uniform heating and compact and atmospheric oxygen /air free contact of said iron ore and reductant in said vertically aligned containers inside the kiln at temperature sufficient to thereby effect the said reduction of the iron ore to sponge iron. 2. A system for batch production of sponge iron from iron ore as claimed in claim 1 wherein said refractory containers have a protective internal wall member to prevent entry of atmospheric air /oxygen into the container preferably an internal face coated with ceramic glaze to reduce pores and ensure proper reducing atmosphere inside. 3. A system for batch production of sponge iron from iron ore as claimed in anyone of " claims 1 or 2 wherein said internal wall member of said refractory containers are selectively obtained of card board. Mild Steel sheet and the like of dimensions preferably of thickness in the range of 2 to 10 mm. 4. A system for batch production of sponge iron from iron ore as claimed in anyone of claims 1 to 3 wherein said refractory containers comprise saggers. 5. A system for batch production of sponge Iron from iron ore as claimed in claim 4 wherein said saggers have a diameter in the range of 4 to 24 inches and height in the range of 3 to 24 inches . 6. A system for batch production of sponge iron from iron ore as claimed in anyone of claims 1 to 5 wherein said kilns are selected from coal fired kilns, down draft kilns , coal fired up draft kilns, down draft": chamber kilns , oil fired or gas fired tunnel kilns and shuttle kilns. - 15 - 7. A system for batch production of sponge iron from iron ore as claimed in anyone of claims 1 to 6 wherein the kilns are adapted to vary the firing cycle from 17 Hrs. to 32 Hrs. 8. A system for batch production of sponge iron from iron ore as claimed in anyone of claims l to 7 wherein said means for unloading of the sponge iron from the saggers comprise: sponge iron collection container for collecting the sponge iron dispensed from the respective saggers under gravity ; stand means having a sponge iron release platform with gate/cut out portion selectively disposed such that the sagger means when traversed over said platform the sponge iron is dispensed under gravity through the cut out portion in said platform into the said sponge iron container. 9. A system for batch production of sponge iron from iron ore as claimed In claim 8 wherein said means for unloading of the sponge iron from the saggers comprise; means for adjusting the height of the said platform such that the sponge iron from a plurality of vertically aligned saggers can be unloaded by first aligning the platform at the level of the base of the topmost sagger to be first unloaded followed by aligning the platform with the saggers thereunder one by one for unloading from top to bottom the vertically aligned saggers. 10. A system for batch production of sponge iron from iron ore as claimed in anyone of claims 1 to 9 wherein the vertically aligned containers comprise saggers arranged one above the other with only the lowermost sagger having a base to together define a hollow cylindrical internal space for storage of said iron ore and the reductant mix therein; means for unloading of the of the sponge iron comprises atleast one movable stand means having a sponge-iron release platform with gates/cut out portion for selective disposition inside said kiln with respect to the sagger columns comprising mostly of said baseless saggers arranged one above the other and only the lowermost sagger having a base such that the respective baseless sagger means when traversed over said platform one by one starting from the topmost the sponge iron is discharged under gravity through the gate/cut out portion in said platform of the unloading means. - 16 - 11. A system for batch production of sponge Iron from iron ore as claimed in anyone of claims 7 to 8 wherein said cut out platform of said stand has an outer edge facing the saggers adapted to match the outer profile of the saggers. 12. A system for batch production of sponge iron from iron ore as claimed in anyone of claims 7 to 11 wherein said saggers are cylindrical in shape and said cut out platform of said stand has an outer edge facing the saggers a semi circular shape matching the outer profile of the saggers. 13. A system for batch production of sponge iron from iron ore as claimed in anyone of claims 1 to 12 comprising means for magnetic separation and screening adapted to separate the sponge iron, ash and unburnt coal dust. 14. A system for batch production of sponge iron from iron ore as claimed in anyone of claims 1 to 13 comprising: means Yor pneumatic material and/or gravity based handling for loading of charge into said refractory containers/saggers and/or unloading of the reduced sponge Iron form said refractory containers /saggers to outside said kiln 15. A system for batch production of sponge iron as claimed in anyone of claims 8 to 14 wherein said plurality of saggers positioned one over the other are such that only the lowermost of the saggers is provided with a base member while the other saggers above said lowermost sagger are free of any base to together define a hollow cylindrical internal space for storage of said iron ore and the reductant mix therein ; atleast one of the said saggers atop the lowermost within the lower half of the sagger column preferably between the 2-4th saggers from the lower end provided with a releasable opening adapted to be opened or closed by refractory based stopper means ; means for unloading of the sponge iron generated in said saggers comprising said releasable stoppered sagger adapted for release of the stopper on cooling of the contents for gravity based release of the contents through said opening within said kiln and release of the contents from the saggers thereunder said stoppered sagger by manual upside down unloading. 16. A system for batch production of sponge iron from iron ore as claimed in claim 15 wherein the stopper means is preferably selected of refractory material such as - 17- silicone carbide based materials to ensure compact housing of the content inside the saggers for the reduction at elevated temperature. 17. A system for batch production of sponge iron from iron ore as claimed in anyone of claims 1 to 16 comprising hand driven and/or motor driven trolly means ror introducing the loaded saggers into the kiln and for taking out the same from the kiln post reduction. 18. A method for batch production of sponge iron from iron ore using the system as claimed in anyone of claims 1 to 17 comprising: providing a kiln adapted for heating at temperature sufficient to thereby effect the reduction of the iron ore to sponge iron in the presence of reductant such as hereindescribed ;; providing plurality of atmospheric oxygen/air proof refractory containers with iron ore and reductant charge such as hereindescribed and arranging the same in vertically aligned column or plurality of columns inside the kiln and heating the kiln to ensure compact and atmospheric oxygen /air free contact of said iron ore and reductant in said vertically aligned containers inside the kiln at temperature sufficient to thereby effect the said reduction of the iron ore to sponge iron. 19. A method for batch production of sponge iron from iron ore as claimed in claim 18 wherein the said iron ore and reductant in said plurality of atmospheric oxygen /air proof refractory containers in vertically aligned columns of said refractory containers are arranged for effective uniform heating for the reduction of the ore. 20. A method for batch production of sponge iron from iron ore as claimed in anyone of the preceding claims wherein the internal wall of said refractory containers prior to loading are selectively lined with protective layer selected from card board, Mild Steel sheet and the like of dimensions preferably of thickness in the range of 2 to 10 mm. 21. A method for batch production of sponge iron from iron ore as daimed In anyone of preceding claims wherein said refractory containers used are saggers. 22. A method for batch production of sponge iron from iron ore as daimed in anyone of preceding daims wherein said kilns used are selected from coal fired kilns, down -18- draft kilns, coal fired up draft kilns, down draft chamber kilns, oil fired or gas fired tunnel kilns and shuttle kilns. 23. A method for batch production of sponge iron from iron ore as claimed in anyone of preceding claims wherein said reductant charge comprise coal dust having carbon content 25-70% and/or any other fixed carbon content materials like Graphite and charcoal having carbon content 25-70% with or without other additives selected from Dolomite or Limestone, NaNO3 (Sodium Nitrate) and K2CO3 (Potassium Carbonate). 24. A method for batch production of sponge iron from iron ore as claimed in anyone of preceding claims wherein 62% to 66 % Fe , 50 to 70 % coal dust having carbon content 25-70% and/or any other fixed carbon content materials like Graphite and charcoal leaving carbon content 25-70% is mixed with Iron Ore by weight alongwith 5 to 10 % of Dolomite or Limestone ,and contained in said refractory container/saggers. 25. A method for batch production of sponge iron from iron ore as claimed in anyone of preceding claims wherein the kilns are operated at varying firing cycles from 17 Hrs. to 32 Hrs. 26. A method for batch production of sponge iron from iron ore as claimed in anyone of preceding claims wherein the reduced sponge iron is allowed to cool for a cooling cycle from 10 to 50 Hrs. 27. A method for batch production of sponge iron from iron ore as claimed in anyone of preceding daims wherein the unloading of the sponge iron from the refractory containers/saggers comprise: providing sponge iron collection container for collecting the sponge iron dispensed from the respective saggers under gravity ; providing stand means having a sponge iron release platform with gate/cut out portion selectively disposed such that the respective sagger means when traversed over said platform the sponge iron is dispensed under gravity through the gate/cut out portion in said platform into the said sponge iron container. - 19 - 28. A method for batch production of sponge iron from iron ore as claimed in anyone of preceding claims wherein said unloading of the sponge iron from the saggers comprises: providing saud stand means having sponge iron release platform; adjusting the height of the said platform such that the sponge iron from a plurality of vertically aligned saggers can be unloaded by first aligning the platform at the level of the base of the topmost sagger to be first unloaded followed by aligning the platform with the saggers thereunder one by one for unloading from top to bottom the vertically aligned saggers. 29. A method for batch production of sponge iron from iron ore as claimed in anyone of preceding claims comprising magnetic separation and screening of the reduced sponge iron from ash and unbumt coal dust. 30. A method for batch production of sponge iron from iron ore as claimed in any preceding claims comprising: providing compart refractory container means containing the charge of iron ore and the reductant mix inside said kiln and heating in the temperature range of 900° C to 118O°C or less if use of K2CO3 (Potassium Carbonate) or NaNO3 (Sodium Nitrate ) is made to effect the reduction of the iron ore to sponge iron; pneumatic and /or gravity based material handling for Initial loading of charge Into said refractory containers/saggers and/or subsequent unloading of the reduced sponge iron form said refractory containers /saggers to outside said kiln; and magnetic separation of the sponge iron from the ash and unbumt coal. 31. A method for batch production of sponge iron as claimed in anyone of daims 17 to 30 comprising: arranging atleast one column of vertically aligned and disposed plurality of saggers positioned one over the other with only the lowermost of the saggers provided with a base member while the other saggers above said lowermost sagger used free of any base to together define a hollow cylindrical Internal space for storage of said iron ore and the reductant mix therein ; selecting atleast one of the said saggers -20 - atop the lowermost within the lower half of the sagger column preferably between the 2-4th saggers from the lower end provided with a releasable stoppered opening adapted to be opened or closed by refractory based stopper means ; unloading the sponge iron generated in the saggers by release of the stopper on cooling of the contents for gravity based release of the contents through said opening within said kiln and release of the contents from the saggers thereunder said stoppered sagger by manual displacement/upside down unloading; and subjecting the sponge iron generated to magnetic separation and screening. -21- 32. A method for batch production of sponge iron from Iron ore as claimed in anyone of preceding claims comprising using hand driven and/or motor driven trolly means for introducing the loaded saggers into the kiln and/or for taking out the same from the kiln post reduction. 33. A system for batch production of sponge Iron from iron ore and a method for carrying out such reduction using such system substantially as hereindescribed and illustrated with reference to the accompanying figures. A system and method for bateh manufacture of Sponge Iron from Iron Ore and in particular to a low cost simple system and method of batch manufacture of such Sponge Iron from Iron Ore involving low capital cost and yet suitable for manufacture of Sponge Iron from both Hematite (Fe2O3) Iron Ore as well as Magnetite (Fe3O4) Iron Ore and even from iron ore fines of less than 5 mm apart from the usual sponge grade iron ore of 5-18mm sizes. The system and the method basically simply requires at least one Jala adapted for heating the iron ore in me presence of a reductant and container means adapted to be disposed inside said kiln to ensure compact and atmospheric oxygen / air free contact of said iron ore and reductant in said containers in the kiln in the temperature sufficient to thereby effect the reduction of iron ore to sponge iron. The system and the method used is environment friendly and advantageously can be adapted and used even in remote locations with scarcity or even no power supply .The invention is thus directed to a cost effective alternative to the complex and capital intensive rotary kiln based or gas based manufacture of Sponge Iron presently in use.

Full Text

Field of the Invention
The present invention relates to a system for batch manufacture of Sponge lion from iron Ore and in particular to a low cost simple system and method of batch manufacture of such Sponge Iron from Iron Ore involving tow capital cost and yet suitable for manufacture of Sponge Iron from both Hematite (Fe2O3) Iron Ore as well as Magnetite (Fe3O4) Iron Ore and even from iron ore fines of less than 5 mm apart from the usual sponge grade iron ore of 5-18mm sizes The system and the method used is environment friendly and advantageously can be adapted and used even in remote locations with scarcity or even no power supply .The invention is thus directed to a cost effective alternative to the complex and capital intensive rotary kiln based or gas based manufacture of Sponge Iron presently in use.
Background Art
Sponge lion is basically Direct Reduced Iron (DRI) and is the product obtained from direct reduction of Iron Ore. Usually, in the reduction process the Oxygen in the Iron Ore is eliminated leaving void space and the whole mass becomes porous and spongy. Sponge Iron is widely applicable in the Steel Industry as an important raw material for steel making via the Electric Arc Furnace (EAF) and the Induction Furnace (IF) routes substituting and supplementing scrap of iron and steel.
Presently there are two main technologies for producing Sponge Iron (i) Gas based and pi) Coal based.
The gas-based method involves several alternative technologies and any generalization of the gas based method is not possible. In one such process popularly known as "Midrex process", the gas based system is continuous, moving bed process which converts Iron Oxide (Lump/pellets) into Direct Reduced Iron (DRI) at elevated pressure and predetermined temperature under the reducing action of a hydrogen and carbon monoxide (CO) gas mixture produced by natural gas / steam reforming.
IN 191425 discloses a process for producing Sponge Iron from particulate iron oxide containing ore characterized by the steps of reducing the iron ore containing ore to Sponge Iron in a reduction zone by reacting the iron oxide containing material with a reducing gas, withdrawing

the gas formed during reduction from the reduction zone as a top gas, subjecting the top gas to CO2 purification thereby forming a CQ2 containing off gas and purified top gas, mixing the CO2 containing off gas and a purified top gas and burning it, supplying the thermal energy produced by the CO2 containing off gas to a consumer and recovering the sponge iron obtained in the first step from the reduction zone.
In the coal based method of producing Sponge Iron the same involves reducing iron ore (lump/pellets) with carbonations material like coal or lignite. The reduction process is carried out in a shaft furnace or rotary furnace at stipulated temperature in the range of 850°C-1050°C. The reduced iron from the furnace is cooled and the cool product alter being discharged is next subjected to product separation and handling. Magnetic separators are used to separate the magnetic component from the non-magnetic ingredients.
US 4.362554 disclose a method and apparatus for manufacturing sponge iron by the continuous reduction of iron oxides in a shaft utilizing recirculation gases. Reaction gas is removed from the shaft furnace, substantially cleaned of all CO2 and H2O and then divided into at least two flow portions one of which is passed to a gas generator comprising a plasma burner A reducing agent such as pit coal is injected together with an oxidant into the hot gas from the plasma burner so as to form a gas mixture comprised primarily of CO and H2, which gas mixture is then mixed with the other flow portion of the cleaned reaction gas in such proportion that the temperature of the resulting reduction gas is suitable for the reduction of iron oxides in the shaft furnace.
US 4,362,555 discloses a method and apparatus for manufacturing sponge iron by the continuous reduction of iron oxides in a shaft utilizing recirculation gases. Reaction gas is removed from the shaft furnace, substantially cleaned of all CO2 and H2O, and then divided into at least two flow portions one of which is passed to a gas generator comprising a gas generating shaft substantially filled with a solid reducing agent and a plasma burner arranged in the lower portion of said shaft. An oxidant is injected into the hot gas from the plasma burner so as to form a gas mixture comprised primarily of CO and H 2, which gas mixture is then mixed with the other flow portion of the cleaned reaction gas in such proportion that the temperature of the resulting reduction gas is suitable for the reduction of iron oxides in the shaft furnace.

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IN 191759 discloses a device for producing Sponge Iron from lumps of Iron Oxide in a reduction shaft comprising (1) using a hot dust containing an Carbon Monoxide(CO) rich reduction gas, the reduction is produced in a gas generator by partial oxidation of solid carbon containing material and introduced via a plurality of lateral reduction gas inlets arranged at the same level on the circumference of the reduction shaft, into the reduction shaft at the tower end of the reduction zone and iron oxide lumps are entered in the upper area of the reduction shaft and its lower end discharged as Sponge iron characterized in that below the level of lateral gas inlets are provided additional reduction gas inlets in the form of at least one channel which is over its length downwardly opened and extends from the outside into the radically central area of the reduction shaft.
US4469509 discloses operation of the rotary kitn provided at its charging end with a central burner, solid reducing agents having a high content of volatile constituents are used and the charge and the gas atmosphere are conducted in cocurrent streams. To avoid a high heat bad per unit of volume in the heating-up zone and yet to increase the heating-up rate, a solid carbonaceous reducing agent having a high content of volatile constituents is charged together with the iron oxide-containing material into the charging end of the rotary kiln, oxygen-containing gases are blown through nozzle blocks into the free gas space and into the charge in the heating-up zone, and oxygen-containing gases are blown through nozzle blocks into the free kiln space in the reducing zone.
WO 02/064844 A1 discloses a method for producing sponge iron wherein iron oxide is reduced through heating together with a solid reducing agent to form sponge iron, characterized in that a mixed powder of a hematite powder and an iron ore powder or a mixed powder of hematite powder and a mill scale powder is used as iron oxide and the hematite powder has a specific surface area of 2.0 m2/g or more and is used in an amount of 5 to 45mass % based on the total amount of the iron oxide.
Swedish Pat. No. 73 04 322-5, describes of directly gassifying coal in solid form using a plasma generator. This process essentially requires that the supply of coal must be extremely accurately adjusted and for some grades of coal there are problems in handling the ash. Moreover, the gas produced has a hydrogen content which is lower than the ideal for reduction purposes.

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The drawbacks with the above known coal based methods of producing sponge iron are primarily the extremely high investment cost and also the exceptionally high energy consumption or the limitations in charge characteristics for effective reduction of the ore.
In particular the rotary furnace method involves pit coal together with the ore to be reduced, in an inclined rotary furnace. Such rotary furnace involving coal based system of manufacture of Sponge Iron from Iron Ore is complex and cost extensive and essential involves lot of power consumption by way of achieving the rotary motion of the kiln in the continuous process of reduction of the Ore. Moreover, apart from being capital intensive such coal based method / system involving the rotary kiln is essentially also complex to install involving huge installation space and skilled manpower to handle and iise.
The demands of the steel industry for sponge iron which is ever increasing make it essential to look for alternative methods and system of manufacture of sponge iron which could avoid the complexities and capital intensive approach to manufacture of sponge iron by way of some simple and cost effective system / technique which could be widely adapted and used even in remote locations with scarcity or even no power sources/supply.
Objects of the Invention
It is thus the basic object of the present invention, to provide a simple and cost effective alternative to the complex and capital extensive rotary kiln based manufacture of sponge iron which would be simple, cost effective and convenient to operate / use and can be provided in remote locations for wide scale cost effective manufacture of Sponge Iron to meet the present day growing demands of sponge iron in the Steel Industry.
The other object of the present invention is to provide for a system and the method for batch production of sponge iron from a iron ore which would be simple and cost effective and at the same time workable to produce sponge iron from both the iron ore sources Hematite (Fe2O3) and Magnetite (Fe3O4).
Another object of the present invention is to provide for a system and method for batch producing of sponge iron from iron ore, which can be adapted by the small scale industry with

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low investments and favour advantageous use of cost effective kilns such as low
cost coal fired down draft kilns.
Yet another object of the present invention is to provide for the much required
system and method for small scale batch production of sponge iron involving less
risk by way of smaller charge and also adapted for generation of sponge iron from
low cost iron ore such as those available in sizes of 3-5 mm which are cheaper
than the usual sponge grade iron ore of 5-18 mm which are expensive thereby
favoring the use of iron ore fines and waste in generation of sponge iron.
Yet further object of the present invention is directed to a system and method for
manufacture of sponge iron, which would yield greater realization value in terms
of conversion of cost effective 3-5 mm size Sponge Iron as compared to 5-18 mm
size Sponge Iron.
Yet further object is to provide for a system and method for generation of Sponge
Iron, which would enable advantageous utilizes of cost effective labour in lieu of
capital and cost extensive power consumption in remote locations having scarcity
of power and skilled manpower.
Yet another object of the present invention is to provide for a method and system
for batch manufacture of sponge Iron in batches such as 1-10 Tons per day
depending upon the intended capacity.
Yet further object of the present invention is to provide a system and the method
for use in manufacture of sponge iron, which can be carried out in remote
locations involving low power or less consumption of power.
Yet further object is directed to provide for a system and method for manufacture
of sponge iron, which would be the environment friendly and would be less
polluting.
Summary of the Invention
Thus in accordance with the basic aspect of the present invention there is
provided A system for batch production of sponge iron from iron ore comprising :
a kiln adapted for heating at temperature sufficient to thereby effect the
reduction of the iron ore to sponge iron in the presence of reductant such as
hereindescribed;
plurality of atmospheric oxygen/air proof refractory container disposed in
vertically aligned column or plurality of columns inside the kiln to ensure uniform
heating and compact and atmospheric oxygen /air free contact of said iron ore
and reductant in said vertically aligned containers inside the kiln at temperature
sufficient to thereby effect the said reduction of the Iron ore to sponge iron.

oxygen / air proof refractory containers. Depending upon the characteristic of the charge and the contents, and to meet the requirement of uniform heating of the charge, the charge can be loaded and selectively disposed in plurality of such refractory containers in said kiln. Importantly, to ensure effective heating and atmospheric oxygen / air proof characteristic, the said refractory containers and in particular the internal face thereof is coated with ceramic glaze to reduce pores and to ensure proper reducing atmosphere. Moreover, as a further precaution / protection, a protective internal wall member is provided to further prevent entry of atmospheric air / oxygen into the container. Such protective internal wall can be selected from cardboard , Mild Steel Sheet (MS Sheet), and the like of dimensions preferably of thickness in the range of 2 to 10 mm.
In accordance with one aspect the refractory container can comprise saggers having a diameter in range of 4-24 inches and the height in the range of 3-24 inches.
The kiln can be selected from any conventional kiln preferably coal fired down draft kilns, coal fire up draft kilns, clown draft chamber kilns, oil fired or gas fired tunnel kilns and shuttle kilns.
The reductant charge can comprise coal dust with or without other additives selected from Dolomite or Umestone,NaNO3 (Sodium Nitrate) and K2CO3(Potassiurrr carbonate) in desired proportions. The coal dust used is preferably coal dust having carbon content 25-70% or any other fixed carbon content materials like Graphite and Charcoal having carbon content 25-70%. The iron ore and the reductant charge are mixed and loaded in the container saggers in selective proportions. In accordance with a preferred aspect 62% - 66% Fe, 50-70% coal dust is mixed with iron ore by weight along with 5%-10% of Dolomite or Lime stone.
The system further involves means for unloading of the refractory containers saggers containing the reduced sponge iron. In accordance with one aspect such means for unloading of the sponge iron comprise:

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at least bne container means for collecting the sponge iron dispensed from the respective saggers under gravity;
at least one stand means having the sponge iron release platform with gate / cut out portion selectively disposed such that the saggerifmsans>hen traversed over said platform the sponge iron is dispensed under gravity through the cut out portion in said platform into the said sponge iron container.
In accordance with another aspect the means for unloading of the of the sponge iron comprises atias one movable stand means having a sponge-iron release platform with gates/cut out portionfor selective disposition inside said kiln with respect to the sagger columns comprising mostly of baseless saggers arranged one above the other and only the lowermost sagger having a base such that the respective baseless sagger means when traversed over said platform one by one starting from the topmost the sponge iron is discharged under gravity through the gate/cut out portion in said platform of the unloading means.
In accordance with another aspect the said stand means for unloading can be adapted such that sponge iron from a plurality of vertically aligned saggers can be unloaded by first unloading the topmost sagger followed by the saggers there under one by one, said platform being adapted for height adjustment at the level of the base of the sagger to be unloaded.
The system for batch production of sponge iron further includes means for magnetic separation of the sponge iron, ash and un-bumt coat dust-
In accordance with a preferred aspect, the system for batch production of sponge iron from iron ore in accordance with the invention comprises:
at least ,dne kiln adapted for heating the iron ore in the presence of a reductant; means for ensuring compact and at atmospheric oxygen / air free contact of the said iron ore and reductant comprising providing the said iron ore and the reductant in said kiln loaded in plurality of atmospheric oxygen / air proof refractory containers / staggers in vertically aligned columns within said kiln;
the refractory containers / saggers having an internal space coated with ceramic glaze to reduce pores and ensure proper reducing atmosphere inside and a protective internal wall member selectively obtained of card board, Mild Steel sheet and the like of dimension preferably of thickness in the range of 2 to 10 mm;

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moans for unloading of the reduced sponge iron from the said refractory containers / saggers
outside said kilns; and
means-for magnetic separation of the reduced sponge iron from ash and un-bumt coal dust.
In accordance with yet another aspect, the system for batch production of sponge iron from iron
ore comprises:
at least one kiln adapted for heating the iron ore in the presence of the reductant;
said means for ensuring compact and atmospheric oxygen / air free contact of the said iron ore
and the reductant comprising providing the said iron ore and reductant in said kiln loaded in
plurality of atmospheric oxygen / air proof refractory containers/saggers in vertically aligned
columns within said kiln;
said refractory container having an internal face coated with ceramic glazed to reduced pores
and to ensure proper reducing atmosphere inside and the protective wall member selectively
obtained of cardboard, Mild Steel sheet, and the like of dimensions preferably of thickness in
the range of 2to10mm;
means for mechanized pneumatic and/ or gravity based material handling for loading of charge
into said refractory containers / saggers and / or unloading of Ihe reduced sponge iron from the
said refractory containers / saggers to outside said kiln;
means,for magnetic separation of the reduced sponge iron from ash, and un-bumt coal dust.
In accordance with another aspect of the present invention the system for batch production of sponge iron comprises:
atleastone kiln adapted for heating the iron ore in the presence! of a reductant; container means adapted to be disposed inside said kiln to ensure compact and atmospheric oxygenlair free contact of said iron ore and the reductant in said container in the kiln in the temperature range of 900-1180°C or less if use of K2CQ3 (Potassium Carbonate) or NaNO3 (Sodium Nitrate ) is made comprising an arrangement of atleast one column of vertically aligned and disposed plurality of saggers positioned one over the other such that only the lowermost of the saggers is provided with a base member while the other saggers above said lowermost sagger are free of any base to together define a hollow cylindrical internal space for storage of said iron ore and the reductant mix therein; atleast one of the said saggers atop the lowermost within the lower half of the sagger column preferably between the 2-4th saggers from the lower end provided with a releasable opening adapted to be opened or closed by refractory based stopper means;

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means tor unloading of the sponge iron generated in said saggers comprising said reteasable stoppered sagger adapted for release of the stopper on cooling of the contents for gravity based release of the contents through said opening within said kiln and release of the contents from the saggers thereunder said stoppered sagger by manual upside down unloading; and
means for subjecting the sponge iron generated to magnetic separation and screening.
In the above embodiment the stopper means is preferably selected of refractory material such as siiicone carbide based materials to ensure compact housing of the content inside the saggers for the reduction at elevated temperature
Following the above system it is possible to make the batch process of the invention less labour intensive by way of a semi-continuous and effective manner of handling of charge and the produce of sponge irons
In accordance with yet another aspect of the present invention there is provided a method for batch production of sponge iron from iron ore using the above system comprising: providing at least one kiln adapted for heating the iron ore in the presence of reductent and providing the charge of iron ore and reductant in a compact and atmospheric oxygen / air free contact in container means inside said kiln and heating in the temperature range sufficient to thereby effect the reduction of iron ore to sponge iron.
In the above method the iron ore and the reductant charge are mixed and loaded in said refractory container / saggers in selective proportion / ranges. In accordance with the preferred aspect 62%-66% Fe, 50%-70% Coal dust is mixed with Iron Ore by weight along with 5%-10% of Dolomite or Limestone and contained in said refractory containers / saggers.
The heating of the charge in the above method can be carried out in the kilns by operating the kilns at varying firing cycles from 17 hrs. to 32 hrs. After the firing is completed upon completion of the reduction, the reduced sponge iron is allowed to cool for cooling cycle of 10-50 hrs. After the cooling the saggers are taken out of the kiln and the contents unloaded using the unloading means. Finally, the sponge iron is separated from ash and un-bumt coal dust by magnetic separation means and the sponge iron is packed in bags.

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In accordance with another aspect of the invention the method for batch production of sponge
iron comprises
providing at least one kiln adapted for heating the iron ore in presence of reductant;
providing compact refractory container / sagger means containing the charge of iron ore and
the reductant means in desired proportion inside said kiln and heating in the temperature range
of 900°C - 1180°C or less if use of K2CO3 (Potassium Carbonate) or NaNO3 (Sodium Nitrate)
is made to effect the reduction of iron ore to sponge iron;
pneumatic and/or gravity feed material handling for initial loading of charge into said refractory
container / saggers disposed in kiln and / or subsequent unloading of the reduced sponge iron
from said refractory containers / saggers to outside said kiln; and
magnetic separation of the sponge iron from the ash and un-bumt coal.
In the above system and method of the invention It is also possible to introduce the saggers
loaded with the ore-charge mix in the kilns by hand driven or motor driven trollies. Similarly,
after the reduction is over the saggers for the purpose of unloading can be taken out of the
kilns also by use of such hand or motor driven trollies.,
Brief description in relation to the accompanying figures
The details of the invention is objects and advantages are explained hereunder in greater detail in relation to non-limiting exemplary illustrations of the system tor batch production of sponge iron from iron ore as per the accompanying figures wherein:
Figure 1 illustrates in section a kiln for use in the system for such batch production of Sponge Iron;
Figure 2 is an isometric view of a down draft kiln also showing the disposition of saggers in plurality of vertical columns inside the kiln tor effective loading of charge for the reduction.
Figure 3 illustrates the ring sagger, handi sagger and tile used in the system tor loading of charge
Figure 4 is a schematic illustration of an embodiment of the unloading device in accordance with present invention;

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Figure 5 is an illustration of arrangement of saggers involving atleast one stoppered sagger for unloading in accordance with an aspect of the invention;
Figures 5A and 5B show embodiments of stoppered sagger having the stopper means to facilitate the unloading by gravity and the stopper for such stoppered saggers,
As illustrated in said figure 1 the refractory kiln can be any conventional kiln such as coal fired down draft kiln, coal fire up draft kiln, down draft chamber kilns, oil fire or gas fire tunnel kiln and shuttle kilns. The kiln should be adapted for firing cycles of 17 hrs. to 32 hrs. in the temperature range preferably of 900°C to 1180°C or less if use of K2CO3 (Potassium Carbonate) or NaNO3 (Sodium Nitrate) is made,
As also illustrated in said figure 1, the kiln is basically a dome shaped housing provided with refractory linings (RL) .A flue gas passage (FGP) is shown which is operativefy connected to a chimney means (CM).The kiln is provided with door means (DM) for allowing the containers/saggers into the kiln for reduction and to be taken out when the reduction process is over. The fire box (FB) for heating of the kiln is also shown in the figure.The kiln height, wall thickness, sizes of fire boxes ,door height and chimney height can be selected based on the kiln performance desired).
The method of batch production of sponge iron using the above kiln involves providing of the iron ore, Dolomite or Limestone and coal dust having carbon content 25-70%1x any other fixed carbon containing material like Graphite and charcoal having carbon content 25-70% as reductant in refractory containers / saggers within said kiln. The iron ore and coal dust along with Limestone / Dolomite are mixed with suitable composition within the given range to form the charge and mixture is then placed in said refractory containers known as saggers and loaded inside the kiln.
Importantly, as clearly illustrated in Figure 2, for effective heating of the charge and reductant, the saggers (SG) are placed one above the other in vertically aligned columns within the kiln. The saggers are usually can have diameters varying from 4-24 inches and height of 3-24 inches depending on the characteristic of the ore and the reductant used to provide atmospheric air / oxygen proof containment of the charged in the saggers. The saggers are

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further coated with ceramic glazed to reduce the pones of the saggers to make proper reducing atmosphere. Also prior to loading of the saggers, a protective wait obtained of cardboard or Mild Steel sheet is provided along with internal face. Illustrations of such saggers are provided in the accompanying Figure 3.Figure 2 also illustrates the door means (DM) and the refractory linings obtained of refractory bricks (RB).Further, the fire place (FP), the fire box (FB) and the openings at the top of the dome shaped kiln top are illustrated in the figure.
After completion of loading of the charge in said refractory containers in vertically aligned columns inside the kiln as shown in figure 2, the doors of the kiln are closed with refractories and firing is done by charging of coal in the fire boxes (FB) attached with kilns.
The firing cycle can vary from 17 hrs. - 32 hrs. and after the reduction is completed, the content in the refractory containers / saggers are allowed to cool following a cooling cycle in the range of 10-50 hrs. depending upon the size of kiln and the process involved.
Alter the cooling is achieved the unloading the saggers can be done manually, by using an unloading means as also illustrated in Figure 4. As shown in Figure 4 the unloading means comprises of the container (CO) for containing the gravity based unloading of the contents from the saggers (SG) .For the purpose the unloading means includes a stand means (SM). The stand means (SM) involves a sponge iron release platform (PF) with gate / cut out (COUJ portion selectively disposed such that the sagger means (SG) when traversed over said platform (PF) ,the sponge iron is dispensed under gravity through the cut out (COU) portion of the said platform (PF) into the said sponge iron container
fn accordance with another aspect, the stand means used can be adapted such that the sponge iron from plurality of vertically aligned saggers can be unloaded one after the other by first unloading the topmost sagger followed by me saggers there under one by one, said platform being adapted lor height adjustment at the level of the base of sagger to be unloaded. To facilitate the unloading process, the platform of the stand means having said gate / cut out is provided with an outer edge facing the saggers of a semi-circular type matching the outer profile of the saggers.

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After the unloading is completed, the contents are passed through screens and magnetic separation of sponge iron, ash and un-bumt coal dust Thereafter the sponge iron is packed in bags and transported for subsequent application.
As also discussed, the manual process of loading and unloading can be further attended, if required, following a mechanical process to make it less labor intensive. For the purpose the bins can be prepared at top of the kiln for gravity discharge and after firing by using pneumatic material handling system removal of material from the saggers can be attended.
Reference is now invited to figure 5 which shows an arrangement of vertically aligned sagger (SG)column involving a stoppered sagger (SSG). The stoppered sagger is shown more clearly in accompanying figure 5A with the stopper removed and the stopper opening (SO) being, visible. The stopper means is shown in greater detail in figure 5B.ln such arrangement involving stoppered saggers, while unloading subsequent to cooling, the stopper (ST) is simply opened when the contents from the stoppered sagger and above are released by gravity through the said opening(SO). After the major portion of the contents in the sagger column is thus unloaded the saggers are manually removed and the contents from the saggers below the stoppered sagger is /are unloaded simply by manually displacement /turning up side down
It is thus possible by way of the above disclosed system and method of batch process for manufacture of sponge iron to provide for a simple, cost effective and user friendly manufacturing of sponge iron in the small scale sector to meet the large scale present day demand of sponge iron by way of an alternative to the capital intensive and complex rotary kiln based reduction system presently in use. The system can be provided in remote locations where there is scarcity or even no availability of power to operate complex and capital intensive rotary kilns to favour wide scale cost effective manufacture of sponge iron to meet the present day growing demands of sponge iron in the Steel Industry.Importantly, the system is workable to produce sponge iron from both the iron ore sources Hematite (Fe2O3)and Magnetite (Fe3O4) and even favours utilization of iron ore fines and waste in generation of sponge iron Importantly, the system and method for manufacture of sponge iron disclosed above would also be environment friendly.

We Claim:
1. A (system for batch production of sponge iron from iron ore comprising :
a kiln adapted for heating at temperature sufficient to thereby effect the reduction of the iron ore to sponge iron in the presence of reductant such as hereindescribed;
plurality of atmospheric oxygen/air proof refractory container disposed in vertically aligned column or plurality of columns inside the kiln to ensure uniform heating and compact and atmospheric oxygen /air free contact of said iron ore and reductant in said vertically aligned containers inside the kiln at temperature sufficient to thereby effect the said reduction of the iron ore to sponge iron.
2. A system for batch production of sponge iron from iron ore as claimed in claim 1
wherein said refractory containers have a protective internal wall member to
prevent entry of atmospheric air /oxygen into the container preferably an internal
face coated with ceramic glaze to reduce pores and ensure proper reducing
atmosphere inside.
3. A system for batch production of sponge iron from iron ore as claimed in anyone of
" claims 1 or 2 wherein said internal wall member of said refractory containers are
selectively obtained of card board. Mild Steel sheet and the like of dimensions preferably of thickness in the range of 2 to 10 mm.
4. A system for batch production of sponge iron from iron ore as claimed in anyone of
claims 1 to 3 wherein said refractory containers comprise saggers.
5. A system for batch production of sponge Iron from iron ore as claimed in claim 4
wherein said saggers have a diameter in the range of 4 to 24 inches and height in
the range of 3 to 24 inches .
6. A system for batch production of sponge iron from iron ore as claimed in anyone of
claims 1 to 5 wherein said kilns are selected from coal fired kilns, down draft kilns ,
coal fired up draft kilns, down draft": chamber kilns , oil fired or gas fired tunnel kilns
and shuttle kilns.
- 15 -

7. A system for batch production of sponge iron from iron ore as claimed in anyone of
claims 1 to 6 wherein the kilns are adapted to vary the firing cycle from 17 Hrs. to
32 Hrs.
8. A system for batch production of sponge iron from iron ore as claimed in anyone of
claims l to 7 wherein said means for unloading of the sponge iron from the saggers
comprise:
sponge iron collection container for collecting the sponge iron dispensed from the respective saggers under gravity ;
stand means having a sponge iron release platform with gate/cut out portion selectively disposed such that the sagger means when traversed over said platform the sponge iron is dispensed under gravity through the cut out portion in said platform into the said sponge iron container.
9. A system for batch production of sponge iron from iron ore as claimed In claim 8
wherein said means for unloading of the sponge iron from the saggers comprise;
means for adjusting the height of the said platform such that the sponge iron from a plurality of vertically aligned saggers can be unloaded by first aligning the platform at the level of the base of the topmost sagger to be first unloaded followed by aligning the platform with the saggers thereunder one by one for unloading from top to bottom the vertically aligned saggers.
10. A system for batch production of sponge iron from iron ore as claimed in anyone of
claims 1 to 9 wherein the vertically aligned containers comprise saggers arranged
one above the other with only the lowermost sagger having a base to together
define a hollow cylindrical internal space for storage of said iron ore and the
reductant mix therein; means for unloading of the of the sponge iron comprises
atleast one movable stand means having a sponge-iron release platform with
gates/cut out portion for selective disposition inside said kiln with respect to the
sagger columns comprising mostly of said baseless saggers arranged one above the
other and only the lowermost sagger having a base such that the respective
baseless sagger means when traversed over said platform one by one starting from
the topmost the sponge iron is discharged under gravity through the gate/cut out
portion in said platform of the unloading means.
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11. A system for batch production of sponge Iron from iron ore as claimed in anyone of
claims 7 to 8 wherein said cut out platform of said stand has an outer edge facing
the saggers adapted to match the outer profile of the saggers.
12. A system for batch production of sponge iron from iron ore as claimed in anyone of
claims 7 to 11 wherein said saggers are cylindrical in shape and said cut out
platform of said stand has an outer edge facing the saggers a semi circular shape
matching the outer profile of the saggers.
13. A system for batch production of sponge iron from iron ore as claimed in anyone of
claims 1 to 12 comprising means for magnetic separation and screening adapted to
separate the sponge iron, ash and unburnt coal dust.
14. A system for batch production of sponge iron from iron ore as claimed in anyone of
claims 1 to 13 comprising:
means Yor pneumatic material and/or gravity based handling for loading of charge into said refractory containers/saggers and/or unloading of the reduced sponge Iron form said refractory containers /saggers to outside said kiln
15. A system for batch production of sponge iron as claimed in anyone of claims 8 to 14
wherein said plurality of saggers positioned one over the other are such that only
the lowermost of the saggers is provided with a base member while the other
saggers above said lowermost sagger are free of any base to together define a
hollow cylindrical internal space for storage of said iron ore and the reductant mix
therein ; atleast one of the said saggers atop the lowermost within the lower half of
the sagger column preferably between the 2-4th saggers from the lower end
provided with a releasable opening adapted to be opened or closed by refractory
based stopper means ;
means for unloading of the sponge iron generated in said saggers comprising said releasable stoppered sagger adapted for release of the stopper on cooling of the contents for gravity based release of the contents through said opening within said kiln and release of the contents from the saggers thereunder said stoppered sagger by manual upside down unloading.
16. A system for batch production of sponge iron from iron ore as claimed in claim 15
wherein the stopper means is preferably selected of refractory material such as
- 17-

silicone carbide based materials to ensure compact housing of the content inside the saggers for the reduction at elevated temperature.
17. A system for batch production of sponge iron from iron ore as claimed in anyone of
claims 1 to 16 comprising hand driven and/or motor driven trolly means ror
introducing the loaded saggers into the kiln and for taking out the same from the
kiln post reduction.
18. A method for batch production of sponge iron from iron ore using the system as
claimed in anyone of claims 1 to 17 comprising:
providing a kiln adapted for heating at temperature sufficient to thereby effect the reduction of the iron ore to sponge iron in the presence of reductant such as hereindescribed ;;
providing plurality of atmospheric oxygen/air proof refractory containers with iron ore and reductant charge such as hereindescribed and arranging the same in vertically aligned column or plurality of columns inside the kiln and heating the kiln to ensure compact and atmospheric oxygen /air free contact of said iron ore and reductant in said vertically aligned containers inside the kiln at temperature sufficient to thereby effect the said reduction of the iron ore to sponge iron.
19. A method for batch production of sponge iron from iron ore as claimed in claim 18
wherein the said iron ore and reductant in said plurality of atmospheric oxygen /air
proof refractory containers in vertically aligned columns of said refractory containers
are arranged for effective uniform heating for the reduction of the ore.
20. A method for batch production of sponge iron from iron ore as claimed in anyone of
the preceding claims wherein the internal wall of said refractory containers prior to
loading are selectively lined with protective layer selected from card board, Mild
Steel sheet and the like of dimensions preferably of thickness in the range of 2 to
10 mm.
21. A method for batch production of sponge iron from iron ore as daimed In anyone of
preceding claims wherein said refractory containers used are saggers.
22. A method for batch production of sponge iron from iron ore as daimed in anyone of
preceding daims wherein said kilns used are selected from coal fired kilns, down
-18-

draft kilns, coal fired up draft kilns, down draft chamber kilns, oil fired or gas fired tunnel kilns and shuttle kilns.
23. A method for batch production of sponge iron from iron ore as claimed in anyone of
preceding claims wherein said reductant charge comprise coal dust having carbon
content 25-70% and/or any other fixed carbon content materials like Graphite and
charcoal having carbon content 25-70% with or without other additives selected
from Dolomite or Limestone, NaNO3 (Sodium Nitrate) and K2CO3 (Potassium
Carbonate).
24. A method for batch production of sponge iron from iron ore as claimed in anyone of
preceding claims wherein 62% to 66 % Fe , 50 to 70 % coal dust having carbon
content 25-70% and/or any other fixed carbon content materials like Graphite and
charcoal leaving carbon content 25-70% is mixed with Iron Ore by weight alongwith
5 to 10 % of Dolomite or Limestone ,and contained in said refractory
container/saggers.
25. A method for batch production of sponge iron from iron ore as claimed in anyone of
preceding claims wherein the kilns are operated at varying firing cycles from 17 Hrs.
to 32 Hrs.
26. A method for batch production of sponge iron from iron ore as claimed in anyone of
preceding claims wherein the reduced sponge iron is allowed to cool for a cooling
cycle from 10 to 50 Hrs.
27. A method for batch production of sponge iron from iron ore as claimed in anyone of
preceding daims wherein the unloading of the sponge iron from the refractory
containers/saggers comprise:
providing sponge iron collection container for collecting the sponge iron dispensed from the respective saggers under gravity ;
providing stand means having a sponge iron release platform with gate/cut out portion selectively disposed such that the respective sagger means when traversed over said platform the sponge iron is dispensed under gravity through the gate/cut out portion in said platform into the said sponge iron container.
- 19 -

28. A method for batch production of sponge iron from iron ore as claimed in anyone of
preceding claims wherein said unloading of the sponge iron from the saggers
comprises:
providing saud stand means having sponge iron release platform;
adjusting the height of the said platform such that the sponge iron from a plurality of vertically aligned saggers can be unloaded by first aligning the platform at the level of the base of the topmost sagger to be first unloaded followed by aligning the platform with the saggers thereunder one by one for unloading from top to bottom the vertically aligned saggers.
29. A method for batch production of sponge iron from iron ore as claimed in anyone of
preceding claims comprising magnetic separation and screening of the reduced
sponge iron from ash and unbumt coal dust.
30. A method for batch production of sponge iron from iron ore as claimed in any
preceding claims comprising:
providing compart refractory container means containing the charge of iron ore and the reductant mix inside said kiln and heating in the temperature range of 900° C to 118O°C or less if use of K2CO3 (Potassium Carbonate) or NaNO3 (Sodium Nitrate ) is made to effect the reduction of the iron ore to sponge iron;
pneumatic and /or gravity based material handling for Initial loading of charge Into said refractory containers/saggers and/or subsequent unloading of the reduced sponge iron form said refractory containers /saggers to outside said kiln; and
magnetic separation of the sponge iron from the ash and unbumt coal.
31. A method for batch production of sponge iron as claimed in anyone of daims 17 to
30 comprising:
arranging atleast one column of vertically aligned and disposed plurality of saggers positioned one over the other with only the lowermost of the saggers provided with a base member while the other saggers above said lowermost sagger used free of any base to together define a hollow cylindrical Internal space for storage of said iron ore and the reductant mix therein ; selecting atleast one of the said saggers
-20 -

atop the lowermost within the lower half of the sagger column preferably between the 2-4th saggers from the lower end provided with a releasable stoppered opening adapted to be opened or closed by refractory based stopper means ;
unloading the sponge iron generated in the saggers by release of the stopper on cooling of the contents for gravity based release of the contents through said opening within said kiln and release of the contents from the saggers thereunder said stoppered sagger by manual displacement/upside down unloading; and
subjecting the sponge iron generated to magnetic separation and screening.
-21-
32. A method for batch production of sponge iron from Iron ore as claimed in anyone of
preceding claims comprising using hand driven and/or motor driven trolly means for
introducing the loaded saggers into the kiln and/or for taking out the same from the
kiln post reduction.
33. A system for batch production of sponge Iron from iron ore and a method for
carrying out such reduction using such system substantially as hereindescribed and
illustrated with reference to the accompanying figures.

A system and method for bateh manufacture of Sponge Iron from Iron Ore and in particular to a low cost simple system and method of batch manufacture of such Sponge Iron from Iron Ore involving low capital cost and yet suitable for manufacture of Sponge Iron from both Hematite (Fe2O3) Iron Ore as well as Magnetite (Fe3O4) Iron Ore and even from iron ore fines of less than 5 mm apart from the usual sponge grade iron ore of 5-18mm sizes. The system and the method basically simply requires at least one Jala adapted for heating the iron ore in me presence of a reductant and container means adapted to be disposed inside said kiln to ensure compact and atmospheric oxygen / air free contact of said iron ore and reductant in said containers in the kiln in the temperature sufficient to thereby effect the reduction of iron ore to sponge iron. The system and the method used is environment friendly and advantageously can be adapted and used even in remote locations with scarcity or even no power supply .The invention is thus directed to a cost effective alternative to the complex and capital intensive rotary kiln based or gas based manufacture of Sponge Iron presently in use.

Documents:

00310-kol-2004 abstract.pdf

00310-kol-2004 claims.pdf

00310-kol-2004 correspondence.pdf

00310-kol-2004 description(complete).pdf

00310-kol-2004 drawings.pdf

00310-kol-2004 form-1.pdf

00310-kol-2004 form-18.pdf

00310-kol-2004 form-2.pdf

00310-kol-2004 form-3.pdf

00310-kol-2004 letters patent.pdf

00310-kol-2004 p.a.pdf

310-KOL-2004-CORRESPONDENCE 1.1.pdf

310-KOL-2004-FORM 27.pdf

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Patent Number

206196

Indian Patent Application Number

310/KOL/2004

PG Journal Number

16/2007

Publication Date

20-Apr-2007

Grant Date

20-Apr-2007

Date of Filing

10-Jun-2004

Name of Patentee

MAYUR ELECTRO CERAMICS PVT. LTD.

Applicant Address

GORUMAHISANI-757042. DIST:MAYURBHANJ. ORISSA

Inventors:

#	Inventor's Name	Inventor's Address
1	MISRA JAGADISH	MAYUR ELECTRO CERAMICS PVT. LTD. GORUMAHISANI-757042. DIST:MAYURBHANJ. ORISSA

PCT International Classification Number

N/A

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA