FIELD: metallurgy. SUBSTANCE: invention relates to processing alloys of noble metals with lead (crude lead). Concentration is carried out by oxidation of lead alloy with air oxygen. Lead oxides and contaminants were obtained by covering addition - sodium hydroxide melt on the surface of metallized phase and system stirring at 600-700 C. EFFECT: improved method of alloy processing. 2 cl, 3 tbl
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