Removal of cadmium from raw indium by physical and chemical methods

Minerals & Metallurgical Processing | August 1, 2007| | Copyright

Abstract

It is difficult to remove cadmium from raw indium using only electrolytic refining because their standard potentials are similar. In this paper, physical and chemical methods were used to remove Cd from raw indium. Indium metal is vacuum refined for two hours at 400°C with a vacuum pressure of 20 Pa. In this process, 99.70% of the Cd can be removed. The removal rate of Cd reaches 90% to 95% when indium is further smelted for 10 minutes in a 20% glycerin solution of KI and I^sub 2^ at 180°C. When pre-indium is electrolytic refined in an In^sub 2^(SO^sub 4^)^sub 3^-H^sub 2^SO^sub 4^ ...

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