High purity indium with total content of impurities 10~(-3) -10~(-6) percent is required for the application in radio electronics, semiconductors, special alloys. For the refining of crude indium produced by means of solution cementation various procedures are used in particular electrolytic refining in salt low-melting point melts that has been successfully developing lately. A fundamentally new design of thin layer electrolyzer has been developed and implemented to a commercial scale The optimal electrolysis conditions: temperature 220-230 deg C; cathode current density 0.2-0.4 A/cm~2; discharge of cathode metal and additional feed of anode metal - once per day. Bath efficiency 4-5 kg/day. Quantity of electrolyte 30 g.
展开▼
