The feasibility of electrolytic stripping of U(VI) using an electrolytic separation cell with anode and cathode compartments, separated by a cation exchange membrane (CEM), was investigated as a possible final step in a traditional solvent extraction process to recover uranium. The reduction mechanism of U(VI)–U(IV) in oxalic acid was compared with the well-known nitric acid and hydrazine mechanism. It was shown that a similar mechanism was followed in both electrolytes, forming a U(V) intermediate followed by disproportionation to U(IV) and U(VI). Measurable amounts of U(IV) were produced and the transfer of U(VI) through the CEM with simultaneous electro-reduction to U(IV) was confirmed.

中文翻译：

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使用电解 CEM 分离池电还原草酸中 U(VI) 的可行性

使用带有阳极和阴极隔室并由阳离子交换膜 (CEM) 隔开的电解分离池对 U(VI) 进行电解汽提的可行性进行了研究，作为传统溶剂萃取工艺中回收铀的可能的最后一步。U(VI)–U(IV) 在草酸中的还原机理与众所周知的硝酸和肼机理进行了比较。结果表明，两种电解质都遵循类似的机制，形成 U(V) 中间体，然后歧化为 U(IV) 和 U(VI)。产生了可测量的 U(IV)，并确认了 U(VI) 通过 CEM 的转移，同时电还原为 U(IV)。