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Electrorefining of Indium Metal From Impure In-Sn Alloy in Fluoride Molten Salt

Lee Hyun-Gyu, Choi Sang-Hoon, Sim Jae-Jin, Lim Jae-Hong, Hyun Soong-Keun, Lee Jong-Hyeon, Park Kyoung-Tae

Archives of Metallurgy and Materials

2019

Vol. 64, iss. 3

899--905

In this study, molten salt electrorefining was used to recover indium metal from In-Sn crude metal sourced from indium tin oxide (ITO) scrap. The electrolyte used was a mixture of eutectic LiF-KF salt and InF3 initiator, melted and operated at 700°C. Voltammetric analysis was performed to optimize InF3 content in the electrolyte, and cyclic voltammetry (CV) was used to de-termine the redox potentials of In metal and the electrolyte. The optimum initiator concentration was 7 wt% of InF3 , at which the diffusion coefficients were saturated. The reduction potential was controlled by applying constant current densities of 5, 10, and 15 mA/cm2 using chronopotentiometry (CP) techniques. In metal from the In-Sn crude melt was deposited on the cathode surface and was collected in an alumina crucible.