PROCEDURE FOR TREATMENT OF ZINC CONTAINING GOLD-SILVER AND/OR SILVER-GOLD CAKES WITH EXTRACTION OF VALUABLE COMPONENTS Russian patent published in 2011 - IPC C22B11/00 C22B3/46 

FIELD: metallurgy.

SUBSTANCE: procedure for treatment zinc containing gold-silver and/or silver-gold cakes consists of sulphuric acid leaching with aeration by air or mixture of gases oxygen-air and in filtration of pulp with production of filtrate containing compounds of zinc, copper and selenium. Selenium is cemented from filtrate with metallic copper. Pulp is filtered and there is produced copper containing selenium cake and the second filtrate. At pH 1.0÷3.0 copper is cemented from the second filtrate with addition of at least one equivalent of metallic zinc. Upon total dissolution of zinc pulp is filtered and there is produced copper containing cake and the third filtrate containing sulphate of zinc. The third filtrate is electrolysed; there is produced cathode zinc. Spent electrolyte is returned to leaching zinc containing gold-silver and/or silver/gold cake.

EFFECT: reduced consumption of sulphuric acid and water at processing zinc containing silver-gold cyanic cakes into commodity silver-gold alloy, metal zinc, metal copper and selenium-cooper product.

16 cl, 1 tbl