8. Electro-refining
Indium cement is used to manufacture anodes for electrorefining. This can be carried out in an aqueous or molten-salt medium. The aim is to obtain indium with a minimum purity of 99.95%.
8.1 In aqueous media
The redox half-reactions for indium are :
at the anode: In0 → In3+ + 3rd-;
at cathode: In3+ + 3e- → In0.
The faster the In3+/In0 electrochemical system, the more efficient the separation between indium and impurities. Equilibrium normal potentials (E°) with respect to the normal hydrogen electrode (ENH) are shown in Table 8.
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