METHOD OF SEPARATION OF NON-FERROUS AND NOBLE METALS AT PROCECCING MATERIALS CONTAINING THEM Russian patent published in 2009 - IPC C22B11/00 C22B3/04 C22B3/20 

FIELD: metallurgy.

SUBSTANCE: method consists in diluting material with water and in treating pulp with nitric acid. Further, not dissolved material is separated, washed and chlorinated in hydrochloric acid and pulp is filtrated. Upon filtration hydrochloric acid solution is neutralised; sediment of impurities of non-ferrous metals is separated from solution containing noble metals. Also upon diluting pulp is treated with nitric acid to redox potential of 800-900 mV. Sodium chloride is introduced into obtained hydrochloric acid solution first, then formed silver salt is separated, solution is treated with sodium sulphate and lead salt is filtered off. Further, redox potential of solution is reduced to 300-450 mV by introducing light alloy containing copper for reduction of palladium and its precipitation. Then sediment is separated, and solution is neutralised with alkali; formed sediment containing copper is filtered.

EFFECT: upgraded degree of separation of non-ferrous and noble metals and extracting of silver, copper, and lead into selective product with low contents of platinum metals.

1 ex