METHOD OF PRODUCING METALLIC LEAD FROM SWEET PASTE MAKING ACTIVE PART OF LEAD-ACID ACCUMULATOR Russian patent published in 2012 - IPC C22B13/00 C22B7/00 C22B3/04 C25C1/18 

FIELD: metallurgy.

SUBSTANCE: invention relates to electrolytic production of metallic lead from sweet lead paste that makes active part lead-acid accumulator. Method comprises the following steps: a) leaching of sweet paste by bringing it in contact with solution containing ammonium chloride to obtain solution after leaching and discharge of CO₂ gas; b) separation of first solid residue and first clarified solution after leaching from step (a); c) leaching solid residue separated at step (b) by bringing it in contact with solution comprising ammonium chloride and hydrogen peroxide; d) separation of second solid residue and second clarified solution after leaching from solution after leaching from step (c); e) combining first clarified solution after leaching from step (b) with second clarified solution after leaching from step (d) to produce single solution; f) electrolysis of solution from step (e) in flow-through cell at current density of 50 to 10000 A/m². Note here that electrolysis brings about mossy lead. Invention relates also to method of desulfonation of said paste.

EFFECT: higher yield and efficiency, simplified process.

26 cl, 6 dwg, 2 ex