FIELD: hydrometallurgy. SUBSTANCE: osmium in extractant is concentrated at simultaneous extractive rhenium extraction with technical trialkylamine. Extract containing rhenium and osmium is heated up to 50-80 C and exposed for 20-30 min following by cooling. After rhenium reextraction regenerated extractant containing osmium is fed to extraction. After osmium accumulation extractant is removed from the process. EFFECT: improved method of osmium preparing.
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