METHOD OF EXTRACTION OF PLATINUM FROM HYDROCHLORIC ACID SOLUTIONS OF COMPLEX COMPOSITION Russian patent published in 2007 - IPC C22B11/00 C22B3/24 

FIELD: hydrometallurgy of platinum; extraction of platinum from hydrochloric acid solutions of complex composition, for example from mother liquor of platinum refining process by sorption.

SUBSTANCE: proposed method includes sorption of platinum on complexion of ionite which is selective to platinum; complexion of ionite contains thiourea functional groups; then, ionite is washed with acidulous water and platinum is desorbed by thiourea solution acidified by hydrochloric acid. Prior to sorption, oxidation-reduction potential of initial solution is brought to magnitude equal to or lesser than magnitude determined by the following equation: E=0.62-0.591 g C_Cl, where E is oxidation-reduction potential of solution relative to hydrogen electrode, V; C_Cl is total concentration of chloride ion in solution, mole/l. Sorption is performed by treatment with reductant.

EFFECT: high degree of extraction of platinum; increased productivity of process; increased yield of platinum; increased concentration of platinum.

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