Research and Production Practice of Crude Indium Vacuum Distillation to Remove Cadmium Wu Chengchun (Zhanjin Lingnan Shaoguan Smelter Maba Plant, Guangdong Shaoguan 512100) Pa, distillation time 2 h, except for cadmium rate up to 97%-99%. It shows that with this process, except for cadmium, the cadmium content of crude indium can be reduced to 0.01%. In addition to cadmium, indium can meet the raw material requirements of the electrolytic process.
Indium is a bright silver-white metal with an abundance of about 0.1X in the earth's crust. 106. Indium does not have an independent deposit that can be mined. It is mainly associated with zinc, lead, copper and tin. Therefore, metallic indium is generally produced as a by-product. The indium products recovered by each smelter are generally purified by electrolytic refining. For the element whose oxidation potential is more positive or negative than indium, separation of the impurity element by the control potential method has good separation effect, but it is difficult to remove elements that are close to the oxidation potential of indium such as cadmium and tellurium. For crude indium containing low cadmium, oxidizing agent can be added to remove cadmium after the electrolysis. For crude indium containing high cadmium, on the one hand, cadmium pollutes the electrolyte seriously, and it is necessary to frequently replace and treat the electrolyte, which consumes large amounts of reagents; on the other hand, the indium containing cadmium after electrolysis is still high, and when oxidizing, the oxidant is added. Complex cadmium removal still does not meet product quality requirements. In this paper, the cadmium in the crude indium was distilled by using the difference of the saturated vapor pressure of the indium-cadmium binary system. The vacuum distillation method for separation of indium and cadmium has proved to be effective in addition to cadmium, with the exception of the cadmium rate of more than 97%, simple equipment, easy operation, low reagent consumption, reduced electrolyte purification, and reduced intermediate slag The quantity is a new process and new technology with low energy consumption and no pollution.
1 The theoretical basis for vacuum distillation in addition to cadmium Wei Yong, Luo Tianjiao. Study on the removal of cadmium, zinc, gallium and lead from crude indium by vacuum method IJ Gold Industry Press, 2000.
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