Journal
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
Volume 326, Issue 2, Pages 1505-1510Publisher
SPRINGER
DOI: 10.1007/s10967-020-07367-3
Keywords
Uranium reduction; Oxalic acid electrolyte; Cation exchange membrane; Electrolytic stripping
Funding
- South African Nuclear Energy Corporation SOC Ltd
- North-West University
- Chemical Resource Beneficiation (CRB) focus area
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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.
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