METHOD OF SEPARATING PLATINUM AND RHENIUM SULPHIDES Russian patent published in 2013 - IPC C22B61/00 C22B11/00 C22B3/14 

FIELD: chemistry.

SUBSTANCE: method involves pulping a concentrate of platinum and rhenium sulphides in aqueous ammonia solution. The pulp is then treated with hydrogen peroxide solution; the reaction mixture is acidified with sulphuric acid, heated and then aged, and the precipitate of platinum compounds is separated from the rhenium solution by filtering the reaction mixture. The pulp is treated with hydrogen peroxide solution at temperature of 25-45°C; the reaction mixture is acidified with sulphuric acid until achieving pH 0.2-2.0 without preliminary separation of the undissolved precipitate. Before filtering, the reaction mixture is further treated with hydrogen peroxide solution.

EFFECT: enabling separation of platinum and rhenium at the step for extracting rhenium from a sulphide concentrate.

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