METHOD OF GOLD-SILVER ALLOY PROCESSING Russian patent published in 2008 - IPC C22B11/00 C22B3/06 C22B3/20 

FIELD: metallurgy.

SUBSTANCE: invention refers to hydrometallurgy of noble metals and can be used at processing of gold-silver alloys. The method includes dissolving of granulated gold-silver alloy with chloronitric acid and separation of silver chloride. Before sediment of gold out of the produced solution it is treated with carbamide powder, then settled during 12-24 hours and the sediment of silver chloride is repeatedly separated. The settled gold is washed with concentrated hydrochloric acid during 4-5 hours at the temperature of 50-60°, and after cooling of the washing solution, washed with water.

EFFECT: reduction of "back remaining" of gold in the process, increased output of available product, including reduction of material and labour consumption required for obtaining of final product.

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