ELECTROLYTIC METHOD FOR PURIFYING CONCENTRATED HYDROCHLORIC ACID SOLUTIONS OF ALLOYS OF PLATINUM WITH RHODIUM, IRIDIUM, AND/OR PALLADIUM Russian patent published in 1997 - IPC

FIELD: electrolytic processes. SUBSTANCE: invention focuses on recovering high-purity platinum from solutions of its alloys and simultaneously exhausting other precious and alkali metal impurities. Process is carried out in electrolytic cell separated by cation-exchange membrane under potentiostatic conditions or controlled voltage within 8 to 16 V range and current density ranged from 12.5 to 37.5 A/sq.dm, after which exhausted metals of platinum alloy are isolated. Content of platinum alloy in its hydrochloric acid solutions is varied over 50 to 700 g/l range, and summary impurity content is less than 5000 ppm. EFFECT: reduced expenses and environmental damage.