Abstract
The kinetics and mechanism of the formation of complex Cd (I) ions via the reaction of metallic cadmium with Cd2+ ions in the Cdo-CdCl2-ZnCl2-NH4Cl system are studied spectroscopically. The formation of Cd2 2+ and Cd2 3+ is evidenced by absorption bands around 270 and 335 nm, respectively, in the electronic spectrum of the melt. The anode current efficiency is determined for cadmium electrorefining in a chloride melt. A method is proposed for electrolytic cadmium refining in molten cadmium chloride with the use of bipolar Cd electrodes. The effect of electrolysis conditions on the refining process is analyzed, and the distribution ratios of typical metallic impurities in Cd are evaluated. The results demonstrate that high-purity Cd can be obtained in a single electrolysis cycle.
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