EXTRACTION OF LEAD IN FORM OF HIGH-PURITY LEAD CARBONATES FROM DEAD LEAD BATTERIES, INCLUDING ELECTRODE PASTE Russian patent published in 2012 - IPC C22B13/00 

FIELD: metallurgy.

SUBSTANCE: lead-containing raw material is leached in solution of acetic, nitric, fluoroboron or hydrofluosilicic acid for dilution of lead oxide and other soluble substance; then, hydrogen peroxide or sulphur dioxide or sulphite is added for recovery of lead dioxide not dissolved in acid leaching solution to soluble Pb (II) compounds or for formation of non-soluble lead sulphite and sulphuric acid for conversion of all dissolved lead compounds to non-dissolved lead sulphate. Solid phase consisting of lead sulphate and non-dissolved substances is separated from acid leaching solution and selective dilution of lead sulphate contained in the above separate solid phase is performed in water solution at least of one solubilising compound; after that, the solution containing the dissolved lead sulphate is separated from solid-phase residue which includes non-soluble impurities Then, to the separated lead sulphate solution there added are sodium, potassium or ammonium carbonates for formation of non-soluble lead carbonate and/or lead oxicarbonate and soluble sulphate of the same cation of the added carbonate salt, and deposited lead carbonate and/or oxicarbonate is separated from the dissolving solution which now also contains cation sulphate of the above solubilising compound

EFFECT: extraction of lead at inconsiderable effect on the environment in valuable form of high-purity lead carbonates which can be converted to high-purity lead oxide by heat treatment in the furnace at relatively low temperature suitable for production of active electrode pastes of new batteries.

19 cl, 1 tbl, 2 dwg, 13 ex