Abstract
Electro-refining of rough indium by method of reactionary electrolysis from the chloride solutions containing InCl3 was carried out. The research of ionization of rough and modified indium anodes showed a decrease in an overvoltage of dissolution of indium when using the anodes containing bismuth. The values of the activation energy of the ionization stage of rough to 7.3 kJ / mole and the indium anodes modified by bismuth with 5- and 10-fold excess of depressor in relation to the total content of impurities, amounted to 5.6 and 3.7 kJ / mole, respectively. Results of the analysis of the refined indium by ICP-OES and ICP-MS methods showed that use of bismuth as a depressor additive allowed reducing impurity (Zn, Pb, Cd, Cu, Fe, Ni, As, Tl) level to 1.1 ppm.
Highlights
Indium is a rare and trace elements, with a number of unique properties
In [8, 9] oxidation of indium in sulphate and chloride electrolytes at various temperatures to determine the optimal conditions for the electrochemical refining of rough indium was investigated
The anodic dissolution of indium in chloride electrolytes proceeds with a lower overvoltage, than in the perchlorate and sulphate, that is explained by an activating effect of chloride ions and the higher stability of chloride complexes of indium
Summary
Indium is a rare and trace elements, with a number of unique properties. For use in a variety of industries: production of screens LCD monitors, TVs, and LED, fiber optics and electronics indium of high purity with a total impurity content of 10-0.01ppm is required [1]. The authors of papers [6, 7] developed a highly effective method of reactionary electrolysis with electrolyte pre-refining This method is based on the principle of binding the impurities, contained in the purified metal in electrochemically inactive compounds by antimony additives. For purification of rough indium the method of reactionary electrolysis was used, with high productivity, the ability to process automation, ease of hardware design and the lack of multi-stage. This method allows reducing the total impurity content in the reduced indium.
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