Vacuum refining and electrowinning experiments of indium metal with 99.97% purity have been performed to compare the behavior of impurity metals during refining. When indium metal was vacuum refined at 1000degreesC and 1.32 x 10(-8) atm for one hour, the major impurity elements, Pb and Bi, were effectively removed while Al, Cu and Sn were not removed. During electrowinning, solution pH, temperature and NaCl concentration had negligible effects on the current efficiency of electrowinning from the chloride solutions in the experimental ranges. However, a high concentration of indium and NaCl was important in achieving high energy efficiency. By employing electrowinning, the impurity metals in the indium such as Bi, Pb, Al, Mg and Cd were removed while copper was not removed. (C) 2003 Kluwer Academic Publishers. [References: 12]
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机译：进行了纯度为99.97％的铟金属的真空精炼和电积实验，以比较精炼过程中杂质金属的行为。将铟金属在1000℃和1.32 x 10（-8）atm真空精炼1小时后，主要杂质元素Pb和Bi被有效去除，而Al，Cu和Sn没有被去除。在电解沉积过程中，溶液pH，温度和NaCl浓度对实验范围内氯化物溶液电解沉积的电流效率的影响可以忽略不计。但是，高浓度的铟和氯化钠对于实现高能效很重要。通过电沉积，除去了铟中的Bi，Pb，Al，Mg和Cd等杂质金属，而没有除去铜。 （C）2003 Kluwer学术出版社。 [参考：12]
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