Title of Invention

A PROCESS AND SYSTEM FOR TREATING ULTRA FINE POWDER OF STEEL SLAG

Abstract This invention relates to a process and system for treating ultra fine powder steel slag, which comprises: collecting the steel slag into a tank and carrying the tank onto a tipping device by a hoisting equipment; operating the tipping device to transport the steel slag to a granulating device and granulating the steel slag in the granulating device to form granulated slag; transporting the granulated slag into a drying room with a conveyor, wherein the granulated slag is continuously dried in the drying room at a temperature between 200 — 300°C for 30-60 seconds using exhaust heat from a converter; and transporting dried granulated slag, with the conveyor, to a magnetic separation device to separate carbon metal grains from nonmetal grains contained in the granulated slag.
Full Text Field of the Invention
The present invention relates to a process and system for treating ultra fine powder
of steel slag. The process and system can separate carbon metal grains from nonmetal
grains.
Technical Background
Chinese patent application No. CN02135756 disclosed a tilting-type
water-hardening process for treating steel slag. This process uses a water-quench tank
and a stanchion beside the tank. On one side of the stanchion is a granulator. When
melted steel slag was poured into a slag jar on a truck and carried to the water-quench
tank, the slag jar is tilted by operating the drop hanger of the windlass and the
lifting-lug of the slag tar. The tipping leading arm on the slag jar will fall on the
stanchion when certain titling angle is achieved and the slag jar will slowly rotate
around the rotating shaft and pour the steel slag into the water-quench tank. At the
same time, pressurized water in the granulator will be ejected and form a water screen
to granulate the steel slag. The granulated slag is then stored in a slag storing area.
The steel slag made from this invention has the characteristics that the granularity is
small and the shape of grains is more regular. This invention does not pollute
environment because the processed steel slag can be used as raw material and does not
take a large space to store. Therefore, there is a need for a process and system for
treating ultra fine powder of steel slag.
Summary of the Invention
The aim of the invention is to provide a process and system for treating ultra fine
powder of steel slag, which can process the steel slag and separate carbon metal grains
from nonmetal grains.
The aim of the invention is realized by providing a process for treating ultra fine
powder of steel slag, characterized by:
collecting the steel slag into a tank and carrying the tank to a tipping device by a
hoisting equipment;
starting up this tipping device and pouring the steel slag into a metal granulating
device and granulating the steel slag to form granulated slag;
transporting the granulated slag into a drying room with a vertical rising conveyor
for continuously drying the granulated slag by means of exhaust heat from a converter.
The drying temperature is in the range of 200—300 °C and the drying time is in the
range of 30-60 seconds;
transporting the dried granulated slag into a magnetic extractor with the vertical
rising conveyor for magnetic-separation treatment, so as to separate carbon metal
grains from nonmetal grains in the magnetic extractor.
A system for treating ultra fine powder of steel slag is characterized in that it
comprises a hoisting equipment for transporting the slag tank to the tipping device, the
outlet of the tipping device connects with an inlet groove of a slag granulating device,
and the outlet gate of the slag granulating device connects with a vertical rising
conveyor, an exhaust-heat drying room is provided in the middle portion of the
conveyor, a first magnetic separation device is provided at an inner side of the
material flow from the outlet of the conveyor, and a second magnetic separation
device is provided at outer side of the material flow from the outlet of the conveyor
and under the first magnetic separation device. The tipping device has a tipping base,
tipping framework, a front stanchion, a winding and raising mechanism. The
exhaust-heat drying room is connected to the hot air outlet of a heat exchanger via a
pipe.
The present invention has the following advantages:
1 >, The present invention can greatly shorten the slag treating process.
2^ The present invention uses double magnetic separations which can increase the
recovery rate of metal.
3> Due to the use of exhaust heat of the converter in drying the slag grains, the
present invention can conserve energy.
4> Since the metal content is low in the slag grains obtained by the process of the
present invention, they can be recycled and reused so as to improve environment
protection.
Brief Description of Drawings
This invention is further described together with the drawings and the embodiments
as follows.
Fig. 1. is a schematic view of the system according to the invention.
Fig. 2. is a schematic view of the slag granulating device according to the invention
(rotating view in A direction of Fig. 1).
Fig. 3. is schematic view of the slag grain drying and magnetic separation device
according to invention.
Fig. 4. is schematic view of the granulating device according to the invention
(partial enlarged view of Fig. 10).
Fig. 5. is a longitudinal cross-sectional view of the granulating gear of the
granulating device according to the invention.
Fig. 6. is a schematic view of the neck portion of the granulating gear of the
granulating device according to the invention ( enlarged view of section D of Fig. 5).
Fig. 7. is a traverse cross-sectional view of the granulating gear of the granulator in
the invention C-C cutaway view of Fig. 5) .
Fig. 8. is a schematic view of the knapper according to the inventionCE view of Fig.
9)
Fig. 9. is a cross-sectional view of the knapper according to the invention.
Fig. 10. is a longitudinal cross-sectional view of the slag granulating device
according to the invention
Fig. 11. a schematic view of the drying room according to the invention (longitudinal
cross-section).
Embodiments
Example 1:
A process for treating ultra fine powder of steel slag comprises:
collecting the steel slag from a converter and placing it into a tank, and carrying the
tank onto a tipping device;operating the tipping device to pour the steel slag into a granulating device,
wherein the steel slag is treated by the granulating device to form slag grains, the
diameter of the slag grains is less than 6mm, and the processing capability of the
granulating device is 2000 Ton/day;
transporting the slag grains into a drying room with a conveyor and continuously
drying the slag grains using exhaust heat from a converter at a temperature of 200—
300"C for 30-60 seconds;
transporting the dried slag grains into a magnetic separation device with the
conveyor for magnetically separating carbon metal grains from nonmetal grains,
wherein the recovery rate of the carbon metal grains can reach 98% in this
embodiment.
Example 2:
As shown in Fig. 1, Fig.2, and Fig.3, according to the process of example 1, there is a
hoisting conveying device which carries a slag tank 24 onto a tipping device 1 in the
system for treating ultra fine powder of steel slag. The hoisting conveying device can be
a conventional overhead traveling crane 23 or gantry crane. A downspout 3 connects
the outlet of the tipping device 1 with a gully head 4 of a granulating device 8. An
outlet 82 of the granulating device 8 connects with a conveyor 9. The conveyor 9 can
be a heat resistant belt conveyor and there is a drying room 10 in the middle section of
it. A first level magnetic separation device 17 is provided at the inner side of the
materiel flow from the exit of the conveyor 9 and a second level magnetic separation
device 19 is provided at the outer side of the materiel flow and under the first level
magnetic separation device 17. There is a honeycomb duct 18 between the first and
second separation devices. The materiel flow mentioned above refers to the parabolic
locus of the granulated slag formed under the gravity when the granulated slag left the
conveyor. Because the diameter or traverse dimension of the materiel flow is quite
large and the velocity is high, the carbon metal grains near the magnetic separation
device 17 will be separated from the material flow and drop into a metal collection
container 20 through the honeycomb duct 18, while the carbon metal grains further
away from the first magnetic separation device 17 will continue to travel downward
with the material flow and, when arriving at the position of the second level magnetic
separation device 19, these'carbon metal grains will be separated from the material
flow and drop into a metal collection container 21. The refined granulated slag will
drop onto a second belt conveying device 16, and be carried into a medium speed mill
15 by the second belt conveying device 16. The refined granulated slag is processed
into fine powders in the medium speed mill 15 and, then, transported with a belt
conveying device and deposited in a storehouse 14 for future use. In this embodiment,
the granulating slag device also includes an auxiliary system that is composed of a high
pressure water supply device 2, a backwater device 7 and a control device 6.
In this embodiment, the tipping device mentioned above is consisted of a tipping
base 106, a tipping frame 107, a front stanchion 108 and a winding elevating gear 101.
The winding elevating gear 101 is consisted of a steel wire 102, a upright stanchion
103, a crown block 104 and a traveling block 105. The traveling block 105 is fixed on
the tipping frame 107.
In this embodiment, the drying room 10 is connected to a hot air outlet of a heat
exchanger 12 through a pipeline. The heat exchanger 12 is installed on a smoke
cover 11 of the converter. The heat exchanger 12 has a conventional structure and, for
example, is consisted of a shell body, a fan 13, an air input pipeline, a hot air outlet,
and pipelines for heat exchange. Therefore, it will not be described in detail here. The
drying room 10 is a box-shaped metal cover with an insulating layer provided on its
outer surface, and a plurality of hot air jet nozzles are provided on the top of the
drying room 10. The heat-resistant belt conveyor 9 travels through the drying room 10.
Furthermore, the heat exchanger 12 can provide the medium speed mill 15 and the
drying room 10 with hot air at the same time.
As shown in Fig. 11, in order to increase the drying efficiency of the granulated
slag, the drying room 10 can adopt a upright tubular structure. The drying room
includes a upright tubular body 110, a vent 112, a hot air inlet 111, and a blocking
valve 113. The drying room is connected with a first conveyor belt 91 on its top part,
and the blocking valve 113 on the bottom part is coupled to a conveyor belt for
transporting dried slag grains. The vent 112 is installed on the center of the top roof of
the tubular body 110. The hot air inlet 111 is positioned at top part of the tubular body
110 and directed along the tangent direction of the cylindrical side wall of tubular
body 110. After hot air from hot air inlet 111 enters tubular body 110, it forms a
helical hot air flow. The hot air flow fully contacts the falling granulated slag and
rapidly dries the slag grains. The exhaust gas is discharged from the vent 112 and the
dried granulated slag drops onto a dry materiel conveyor belt 92 to be transported to a
magnetic separation device.
As shown in Fig. 10, Fig.4 and Fig. 5, the granulating device 8 has a steel frame with a
support beam 84, the support beam 84 is fixed on a reinforced concrete base 25. An
evaporator 85, a granulator 5, an effuse assembly 81 and a granulated slag output
bucket 82 are provided on the support beam 84. There is a water flume 86 under the
support beam. There is a slag trap 83 at the outlet of the granulator 5 and an inlet
channel 4 at the inlet of the granulator. The upper end of the granulated slag output
bucket 82 extends into the evaporator 85 and the lower end extends onto the conveyor
belt near evaporator. There is a chimney 22 on the top of the granulating device.
As shown in Fig.4 and Fig.5, the granulating device 5 includes a granulating tube box
55, a granulating gear 56, a mechanism for driving the granulating gear, and a device for
spraying water. There are an upper hose 51, a lower hose 52 and two bottom hoses 53,54 provided on the granulating box. The mechanism for driving the granulating gear andthe device for spraying water are the same as that of prior art and, therefore, will not bedescribed in detail. The evaporator 85 includes a gyre tube, a gear ring, a support
backing ring, a carrier roller, a pinch roller and a evaporator driver. The evaporator 85
is the same as the existing one and there is no need for detailed description herein.
As shown in Fig. 5, Fig. 6, Fig. 7, Fig. 8, and Fig. 9, in order to increase the
granulating efficiency of the granulating device and to improve its durability, in the present
embodiment, each end of the granulating gear 56 is provided a terminal plate 561. A
plurality of support radial plates 566 and removable knappers 562 are provided
between the two terminal plates. A plurality of heat-radiating fins 5623 are provided
on the knappers 562. A shaft sleeve 564 is provided in the center portion of the
granulating gear 56. A half axis 565 is installed at one end of the shaft sleeve 564
and a half axis 567 is installed at the other end of shaft sleeve 564. The knapper
mentioned above comprises a straight tooth 5622. A flange 5621 is connected with
both ends of the knapper. The knapper 562 is installed on the terminal plate 561
through the flange 5621 so that it is convenient to replace the knapper. There is a
splash ring 563 provided on the shaft sleeve 564 for cooling the knapper. The cooling
water is ejected onto the splash ring from one end of the granulating gear and, then
ejected onto the knappers with the help of splash ring to cool the granulating gear.
As shown in Fig. 6, in the embodiment, an expansion absorbing trough 568 is
provided between the half axis 565 and one end of the shaft sleeve 564 and between
the half axis 567 and the other end of the shaft sleeve 564 for preventing possible
damage to the bearing due to frequent temperature change of the granulating gear in
working condition and the heat expansion of the two half axes and the shaft sleeve.








I claim:
1. A process for treating steel slag, characterized by:
collecting the steel slag into a tank (24) and carrying the tank onto a tipping device (1) by
a hoisting equipment;
operating the tipping device (1) to transport the steel slag to a granulating device (8) and
granulating the steel slag in the granulating device (8) to form granulated slag;
transporting the granulated slag into a drying room with a conveyor (9), wherein the
granulated slag is continuously dried in the drying room (10) at a temperature between
200— 300 °C for 30-60 seconds using exhaust heat from a converter; and
transporting dried granulated slag, with the conveyor (9), to a magnetic separation device
(17) to separate carbon metal grains from nonmetal grains contained in the granulated
slag.
2. A system for treating steel slag, is characterized by:
a hoisting equipment for moving a slag tank onto a tipping device (1), wherein an outlet of the tipping device (1) couples with a granulating device (8), an outlet of the granulating device (8) couples with a conveyor (9), a drying room (10) is provided in the middle portion of the conveyor (9), a first magnetic separation device (17) is provided at the inner side of a materiel flow from the exit of the conveyor (9), a second magnetic separation device (19) is provided at the outer side of the materiel flow and under the first magnetic separation device (17), the tipping device (1) comprises a tipping base (106), a tipping frame (107), a front stanchion (108), and a winding and raising mechanism (101), the drying room (10) is connected to a hot air outlet of a heat exchanger (12).
3. The system for treating steel slag as claimed in claim 2, wherein there are two
terminal plates (561) on both ends of a granulator gear (56) of the granulating device (8),
a plurality of support radial plates (566) and removable knappers (562) are provided
between the two terminal plates 561, a plurality of heat-radiating fins (5623) are provided
on
the knappers (562), a shaft sleeve (564) is provided in the center portion of the granulating gear (56), a first half axis (565) is installed at one end of the shaft sleeve (564) and a second half axis (567) is installed at the other end of shaft sleeve (564), an expansion absorbing trough (568) is provided between the half axis (565) and one end of the shaft sleeve (564) and between the half axis (567) and the other end of the shaft sleeve (564).
4. The system for treating steel slag as claimed in claim 2, wherein the drying room
(10) comprises a tubular body (110), a vent (112), a heat air inlet (111) and a blocking
valve (113), the drying room (10) is connected with a first conveyor belt (91) on its top part, and the blocking valve (113) on the bottom part is coupled to a conveyor belt for transporting dried slag grains.

Documents:

1321-delnp-2007-abstract.pdf

1321-delnp-2007-Claims-(04-11-2010).pdf

1321-delnp-2007-claims.pdf

1321-delnp-2007-Correspondence-Others-(04-11-2010).pdf

1321-DELNP-2007-Correspondence-Others-(22-11-2010).pdf

1321-DELNP-2007-Correspondence-Others.pdf

1321-delnp-2007-description (complete).pdf

1321-delnp-2007-drawings.pdf

1321-delnp-2007-form-1.pdf

1321-delnp-2007-form-2.pdf

1321-delnp-2007-Form-3-(04-11-2010).pdf

1321-DELNP-2007-Form-3.pdf

1321-delnp-2007-form-5.pdf

1321-DELNP-2007-GPA-(22-11-2010).pdf

1321-delnp-2007-pct-210.pdf

1321-delnp-2007-pct-237.pdf

1321-delnp-2007-pct-304.pdf

1321-delnp-2007-pct-373.pdf

1321-delnp-2007-Petition 137-(04-11-2010).pdf

1321-delnp-2007-Petition 138-(04-11-2010).pdf


Patent Number 245301
Indian Patent Application Number 1321/DELNP/2007
PG Journal Number 02/2011
Publication Date 14-Jan-2011
Grant Date 13-Jan-2011
Date of Filing 19-Feb-2007
Name of Patentee ZHANG,WEITIAN
Applicant Address NO.6-4-101, YUANNAN BUILDING, XIXIN VILLAGE, LUNAN DISTRICT, TANGSHAN, HEBEI 063020, CHINA
Inventors:
# Inventor's Name Inventor's Address
1 ZHANG, WEITIAN NO.6-4-101, YUANNAN BUILDING, XIXIN VILLAGE, LUNAN DISTRICT, TANGSHAN, HEBEI 063020, CHINA
PCT International Classification Number C04B 5/00
PCT International Application Number PCT/CN2004/001046
PCT International Filing date 2004-09-15
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 200410070342.7 2004-08-02 China