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首页> 外文期刊>Metallurgical and Materials Transactions >Electrolytic Reduction of Eu(Ⅲ) to Eu(Ⅱ) in Acidic Chloride Solutions with Titanium Cathode
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Electrolytic Reduction of Eu(Ⅲ) to Eu(Ⅱ) in Acidic Chloride Solutions with Titanium Cathode

机译：钛阴极在酸性氯化物溶液中将Eu（Ⅲ）电解还原成Eu（Ⅱ）

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The feasibility of a rare earth separation process by electrolytic reduction of Eu(Ⅲ) with a titanium cathode was examined by cathodic polarization characteristics of Eu(Ⅲ) on a titanium electrode and batch-type electrolytic reduction of Eu(Ⅲ) using a bipolar electrolytic cell in acidic aqueous solutions of EuCl_3. The reduction of Eu(Ⅲ) started at a cathode potential of about -0.6 V vs standard hydrogen electrode (SHE). The plateau current for the reduction of Eu(Ⅲ) was observed at around — 1.2 V vs SHE, but a further decrease in cathodic potential resulted in a decrease in the reduction current, which was caused by the hydrolysis of Eu(Ⅲ). The plateau current is a diffusion-limiting current in the reduction of Eu(Ⅲ). In the batch-type electrolytic reduction of Eu(Ⅲ) using a bipolar electrolytic cell, complete reduction of aqueous 0.1 kmol m~(-3) EuCl_3 solution with a current efficiency of over 0.6 could be achieved by keeping the catholyte pH at 2, to avoid hydrolysis of Eu(Ⅲ). The final percent Eu(Ⅲ) reduction of the solution from an industrial europium purification process, which contained other rare earths, was lower than that of a synthetic EuCl_3 single electrolyte solution probably because of a more significant hydrolysis of rare earth ions. However, the final percent reduction increased with decreasing reduction current, the concentration of rare earths, and the viscosity of solution.
机译：通过钛电极上Eu（Ⅲ）的阴极极化特性和双极电解法间歇式电解还原Eu（Ⅲ），检验了用钛阴极电解还原Eu（Ⅲ）进行稀土分离工艺的可行性。电池在EuCl_3的酸性水溶液中。与标准氢电极（SHE）相比，Eu（Ⅲ）的还原始于约-0.6 V的阴极电位。相对于SHE，在– 1.2 V左右观察到了用于还原Eu（Ⅲ）的稳定电流，但是阴极电位的进一步降低导致还原电流降低，这是由于Eu（Ⅲ）的水解所致。平台电流是Eu（Ⅲ）还原过程中的扩散限制电流。在使用双极电解池的间歇式电解还原Eu（Ⅲ）中，通过将阴极电解液的pH值保持在2，可以完全还原0.1 kmol m〜（-3）EuCl_3水溶液，电流效率超过0.6。避免Eu（Ⅲ）水解。来自工业euro纯化工艺（包含其他稀土）的最终Eu（Ⅲ）还原百分率低于合成EuCl_3单电解质溶液的百分数，这可能是由于稀土离子的水解作用更大。但是，最终还原百分率随着还原电流，稀土元素浓度和溶液粘度的降低而增加。

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