溶融塩電解によるスズ, インジウム混合アマルガムからインジウムの分離
スズ, インジウムのアマルガム電解精錬に関する研究 (第6報)
1971 年 87 巻 994 号 p. 33-37
詳細
1971 年 87 巻 994 号 p. 33-37
A new refining method, a fused salt electrolysis with amalgam, has been proposed in this investigation to obtain high-purity indium from a mixed amalgam of tin and indium. It was known that high-purity indium was separated efficiently from the mixed amalgam. The following results were obtained.
1) The most suitable electrolyte composition for the electrolysis was 51.6 mole% AICl3, 4.6 mole% InCl and 43.8 mole% NaCl. In this electrolyte, In-Hg was greatly lessnoble than Sn-Hg or Hg, and In was much noble than Al or Na; therefore, it was suggested that only indium was dissolved at the anode and deposited at the cathode during the electrolysis.
2) The fused salt electrolysis with amalgam was performed at 180°C in the electrolyte mentioned above by use of the mixed amalgam (Sn: 1.0wt%, In: 10wt%) as the anode and indium as the cathode. As we suggested above, pure indium could be obtained from this mixed amalgam at high current densities (17.6-26.5 A/dm2). The current efficiencies were 100% at the anode and were 76-78% at the cathode.
