|Title of Invention||
A PROCESS OF EFFLUENT TREATMENT OF ANY GALVANIZING INDUSTRIES
|Abstract||This invention relates to the process of effluent treatment of galvanizing and iron pickling industries to which adding of freshly prepared ferrous hydroxide results into neutralization of acid traces in ferrous chloride effluent and also results into precipitation of impurities, further separation of precipitate, again adding of Barium Sulphide solution to ferrous chloride upto neutralization PH7, results into Barium Chloride and ferrous sulphide precipitate, after separation of the precipitate, heat the left over solution for crystallization of pure Barium Chloride or adding equal amount of dilute sulphuric acid to Barium Chloride results into Barium Sulphate precipitate and Hydrochloric acid, other wise adding of sodium sulphide to ferrous chloride efficient results into sodium chloride and ferrous sulphide.|
The most precious nation building metal of black gold, iron is used world over. It is used as a base metal in nail to steamer preparation. Iron is oxidized by air and water of both together results more damage to the iron just by rusting. The iron alloys also get effected by air and water, however, to stop rusting the iron and even iron alloys are also employed for rust proof coatings by various non-rusting metals like zinc and tin and other. However, for proper coating by 'hot dipping' or elctrolysis results generation of effluents nitric and sulphuric acids, which are extensively used for the pretreatment is carried out with Dilute hydrochloric acid or nitric acid or sulphuric acid.
The iron / iron alloys are washed then itched by dilute Hydrochloric acid / Sulphuric acid / rarely Nitric acid so that the surface blemishes are removed then, the extrusions are heated then dipped in hot liquefied Zinc / Stannous and kept in for some time for coating on extrusions then cooled and packed for different usage of the articles.
The diluted (Hydrochloric Acid) / Nitric Acid) used for itching will be derived out as an effluent, which will be 1-3 pH or it varies but the effluent will be in the form of concentrated and dense, hence the total acidity will not be removed or utilized, therefore, ferrous hydroxide must be added to the effluent so that it will remove extra acid and
By the absorption of the acids the ferrous hydroxide become ferrous chloride, thus the total solution become neutral and it should not get exposed to air or O2, where by it gets oxidized and get converted into ferric chloride. But the impurities get precipitated due to adding of ferrous hydroxide which will be
removed by the filtration, the supernatant is (mother liquid) taken into a big vessel according to the required quantity then fill it with the same (ferrous chloride) liquid and neutralize the solution with basic Barium Sulphide by achieving 7.8-8 pH so that the total ferrous chloride will be converted into ferrous sulphide and the Barium Sulphide will be converted into Barium Chloride. This reaction is a displacement reaction in between acid and basic compounds hence the reaction will be faster and vigorous but to have purity of the compounds, stir the compounds while reacting, then separate the precipitate by centrifuge or by any means after separation of the ferrous sulphide heat the supernatant liquid for crystallization of pure Barium Chloride crystals.
Thus the treatment of ferrous chloride effluent as well as getting useful compounds out of effluent treatment this will whow a zero discharge of effluents. The ferrous sulphide is used in ceramic tiles Barium Chloride will be a good, commercial product to be used in many applications.
1. The process of effluent treatment of galvanizing and iron pickling
industries in/to which adding of freshly prepared ferrous
hydroxide results into neutralization of extra acidic traces present
in and removal of impurities as precipitation then after separation
of the precipitate from the liquid, adding of Barium sulphide to
supernatant Ferrous Chloride result into displacement reaction
which results into conversion of ferrous chloride into ferrous
sulphide precipitate and the Barium Sulphide into Barium
Chloride liquid, after filtration heating the Barium Chloride
supernatant solution results into Barium Chloride crystallization,
again adding of dilute sulphuric acid results in to Barium Sulphate
precipitate and Hydro Chloric acid in addition for simplification
directly adding Sodium Sulphide to ferrous Chloride results into
ferrous sulphide and soudium Chloride.
2. The process as claimed in claim 1 where in the ferrous chloride
effluent after adding freshly prepared ferrous hydroxide and after
removal of precipitate of impurities adding sodium sulphide to
ferrous chloride results into ferrous sulphide precipitate and
sodium chloride after separation the both chemicals are used for
3. The process as claimed in claim 1 and 2 where in the process
claimed for ferrous chloride conversion of effluence generated in
various iron pickling industries it also includes the process for
conversion of ferrous nitrate as adding of Barium Sulphide to
ferrous nitrate results displacement reaction reulting into Barium
nitrate and ferrous sulphide precipitate after filtration / separtion
heating the Barium nitrate solution for crystalization, but if dilute sulphuric acid is added immediately it results into Barium sulphate and nitric acid in the case of treatment followed with Barium Sulphide where as adding sodium sulphide to ferrous nitrate results into sodium nitrate and ferrous sulphide precipitate.
4. The process as claimed in claim 1,2 and 3 where in it also includes that the process for conversion of ferrous sulphate as adding of Barium sulphide to ferrous sulphate results into displacement reaction resulting into Barium sulphate and ferrous sulphide both get precipitated leaving water, after separation adding hydrochloric acid to both precipitates results into generation of hydrogen sulphide gas which is reacted with sodium hydroxide to obtain sodium sulphide and ferrous chloride solution leaving Barium sulphate, where as directly adding sodium sulphide to ferrous sulphate leads to displacement reaction resulting to sodium sulphate and ferrous sulphide precipitate, the ferrous chloride formed in the above reaction to which again adding of Barium sulphide results into displacement reaction resulting into Barium chloride and ferrous sulphide after separation adding of dilute sulphuric acid to Barium chloride results into Barium sulphate and hydrochloric acid generation, where as directly adding sodium sulphide to ferrous chloride results into sodium chloride and ferrous sulphide precipitate, after separation both can be used for various purposes.
|Indian Patent Application Number||627/CHE/2007|
|PG Journal Number||36/2010|
|Date of Filing||28-Mar-2007|
|Name of Patentee||DR. CHINNA VENKATESHWAR|
|Applicant Address||Son of Late C. Laxmaiah, Asso. Professor, Dept. of Environmental Science/Botany, University College of Science, Osmania University, Hyderabad.|
|PCT International Classification Number||C02F 01/00|
|PCT International Application Number||N/A|
|PCT International Filing date|