METHOD OF THE COMPLEX REPROCESSING OF THE LEAD-ACID ACCUMULATORS SCRAP Russian patent published in 2006 - IPC C22B7/00 

FIELD: hydrometallurgy of non-ferrous metals; methods of the complex reprocessing of lead-acid accumulators scrap.

SUBSTANCE: the invention is pertaining to hydrometallurgy of non-ferrous metals, and may be used for the complex reprocessing of lead-acid accumulators scrap. The invention presents the method providing for: desulfatation of the sulfate-oxide fraction with production of the solid desulfated product and the solution of salts; the subsequent leaching of lead with production of the concentrate of antimony and the intermediate products in the form of solutions for production of tribasic lead sulfate (TBLS), in which lixiviation of lead is performed in two phases. At that at the first stage the desulfated product together with metallic fraction of the lead scrap is treated with the solution of nitric acid with production of the antimony-lead cake and the intermediate solution of lead nitrate, which is later treated with a sulfuric solution with production of the reverse solution of the nitric acid, which is fed into the first stage of lixiviation, and the intermediate product in the form of lead sulfate, which is treated with the ammonia solutions with production of the commercial products - TBLS and the ammonia solution of the ammonium sulfate. At the second stage of the lixiviation of lead the antimony-lead cake is treated with the ammonia solution of ammonium sulfate with production of the commercial antimonic concentrate and the ammonia solution of the lead fed to production of TBLS. At that the treatment of lead sulfate with production of TBLS is performed with utilization of the ammoniac solution of lead from the second stage of the lixiviation conducted with utilization of the ammonia solution of the ammonium sulfate formed at production of TBLS, the method ensures reduction of power input, consumption of the reactants and operational costs, and also improved ecological compatibility of the production process.

EFFECT: the invention ensures reduction of power input and consumption of the reactants and operational costs, improved ecological compatibility of the production process.

4 cl, 1 dwg, 2 ex