METHOD OF CLEANING AND CONCENTRATING CHLORINE COMPLEXES OF PLATINUM METALS BY ELECTROLYSIS METHOD Russian patent published in 2004 - IPC

FIELD: hydrometallurgy of platinum metals; refining processes engaged in extraction and purification of platinum metals from primary raw materials and secondary materials. SUBSTANCE: proposed method includes separation of aqua solution of complex compounds of platinoids from solutions of admixtures by means of electro-membrane method. Electrolysis of working solution is performed in four-path electrodialysis converter with the use of cationite and anionite membranes and porous diaphragms mounted in such way that first cationite membrane separates circulating solutions of cationite path from working solution path and porous diaphragm separates working solution from purified solution. Process is conducted at current density of 2.4-3.0 A/sw dm and temperature of 30-60 C; grade MK-40 membrane is used as cationite membrane and grade MA-40 membrane is used as anionite membrane; perfluorinated diaphragm at average diameter of 0.1 mcm is used as porous diaphragm MFFK-1. 2 or 4% solution of NaOH is used as catholyte and anolyte. EFFECT: possibility of performing thorough purification of platinum metals at high concentration coefficients. 3 cl, 2 dwg, 4 ex