FIELD: hydrometallurgical processing of sludges, for example electrolysis sludges of copper-nickel process.
SUBSTANCE: proposed method includes treatment of sludges by oxidant in acid medium for converting silver into solution. Prior to treatment of sludges, they are reduced for converting silver and platinoids into metal powders; treatment is carried out in sulfamic acid medium. Used as oxidant is hydrogen peroxide of potassium or ammonium persulfate; treatment is accompanied by heating. Proposed method makes it possible to separate and clean silver from non-noble metals and accompanying metal of platinum group and gold due to obtaining selective solutions concentrated in silver.
EFFECT: chemically and ecologically safe technology; low cost of reagents.
2 cl, 2 tbl, 2 ex
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