METHOD OF PROCESSING ZINC CAKES Russian patent published in 2001 - IPC

FIELD: non-ferrous metallurgy, particularly, processing of silver-captaining zinc cakes to recover silver into quality standard product. SUBSTANCE: method is carried out by processing zinc cakes in successive stages: flotation, roasting of flotoconcentrate, sulfuric acid leaching of roasted products, including high-temperature digesting in sulfuric acid at solid high-temperature residue to acid ratio of 1:0.7- 1:1.5 at temperatures between 150 and 170 C, leaching of digested product in aqueous solution has chlorine concentration of 0.3- 1 g/l and melting of silver-containing product to prepare Dope alloy. EFFECT: decreased yield of silver-containing product to be melted, greater recovery of silver into metal and reduced cost. 1 ex, 1 tbl