Effect of cathode material on the electrorefining of U in LiCl-KCl molten salts
- Authors
- Lee, Chang Hwa; Kim, Tack-Jin; Park, Sungbin; Lee, Sung-Jai; Paek, Seung-Woo; Ahn, Do-Hee; Cho, Sung-Ki
- Issue Date
- May-2017
- Publisher
- ELSEVIER SCIENCE BV
- Citation
- JOURNAL OF NUCLEAR MATERIALS, v.488, pp 210 - 214
- Pages
- 5
- Journal Title
- JOURNAL OF NUCLEAR MATERIALS
- Volume
- 488
- Start Page
- 210
- End Page
- 214
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/26990
- DOI
- 10.1016/j.jnucmat.2017.03.023
- ISSN
- 0022-3115
1873-4820
- Abstract
- The influence of cathode materials on the U electrorefining process is examined using electrochemical measurements and SEM-EDX observations. Stainless steel (STS), Mo, and W electrodes exhibit similar U reduction/oxidation behavior in 500 degrees C LiCl-KCl-UC13 molten salts, as revealed by the cyclic voltammo-grams. However, slight shifts are observed in the cathodic and anodic peak potentials at the STS electrode, which are related to the fast reduction/oxidation kinetics associated with this electrode. The U deposits on the Mo and W electrodes consist of uniform dendritic chains of U in rhomboidal-shaped crystals, whereas several U dendrites protruding from the surface are observed for the STS electrode. EDX mapping of the electrode surfaces reveals that simple scraping of the U dendrites from W electrodes pretreated in dilute HCI-l solutions to dissolve the residual salt, results in clear removal of the U deposits, whereas a thick U deposit layer strongly adheres to the STS electrode surface even after treatment. This result is expected to contribute to the development of an effective and continuous U recovery process using electrorefining. (C) 2017 Elsevier B.V. All rights reserved.
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