FIELD: refining of precious metals. SUBSTANCE: method involves conversion of potassium chloroplatinate into potassium chloroplatinite. The process is carried out with the help of reduction agent, it is followed by extraction of metal platinum. To prepare insoluble Magnus salt solution of ammonium chloride in 20 % ammonia (having ratio of solid and liquid phases 1:10) is used. Then thus prepared product is affected by chemical reduction. EFFECT: improved efficiency of the method.
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