Solubility of CeO2 and Nd2O3 in LiCl-Li2O melts
- Авторлар: Zhuk S.I.1, Panyak N.S.1, Chernyshev S.V.1, Vlasov M.I.1
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Мекемелер:
- Institute of High-Temperature Electrochemistry, Ural Branch of the Russian Academy of Sciences
- Шығарылым: № 5 (2025)
- Беттер: 537-551
- Бөлім: Articles
- URL: https://bakhtiniada.ru/0235-0106/article/view/309547
- DOI: https://doi.org/10.31857/S0235010625050109
- ID: 309547
Дәйексөз келтіру
Аннотация
Modern development of the nuclear industry requires a solution for the problems of spent nuclear fuel (SNF) processing, increasing the degree of nuclear fuel burn up and separating of fission products (FP) from fissile materials (FM). A promising method for solving these problems is pyrochemical reprocessing of SNF, one of the stages of which is oxide deposition. For safety reasons, the study is conducted using FM and FM simulators, including cerium and neodymium. In this work, the dissolution of neodymium (III) and cerium (IV) oxides in lithium chloride-based melts were studied. In the LiCl-Li2O melt, with a Li2O content not more than 4 mol.%, the solubility of cerium oxide remains below the detection limit, and then it significantly increases reaching 8.4∙10-3and 2.4∙10-2mol.% at 5 and 9 mol.% Li2O respectively. In case of neodymium oxide its solubility in the LiCl-Li2O melt increases linearly from 1.5∙10-3mol.% at 2 mol.% Li2O to 6.4∙10-3mol.% at 9 mol.% Li2O. The time to reach the saturation state during the dissolution of neodymium oxide is several times less than the time to reach the saturation state during the dissolution of neodymium oxide (25 hours for Nd2O3versus 145 hours for CeO2). To analyze the mechanisms of cerium and neodymium oxides dissolution, the phase composition of the ceramic tablets of these oxides after the experiment, as well as optical absorption spectra of the obtained melts were studied. Taking into account these data the possible mechanisms of interaction of cerium and neodymium oxides with LiCl-Li2O melts (0–9 mol.%) were proposed. The dissolution of cerium oxide occurs in a two-stage process with the slow formation of intermediate insoluble cerium compounds followed by their transition to soluble forms LiCeO2(for Ce3+) and Li2CeO3(for Ce4+), whichcauses the slow kinetics and nonlinear dependence on the Li2O content. Neodymium oxide interacts with lithium oxide in the melt, forming a soluble lithium neodymate compound LiNdO2.
Авторлар туралы
S. Zhuk
Institute of High-Temperature Electrochemistry, Ural Branch of the Russian Academy of Sciences
Email: zhuk@ihte.ru
Yekaterinburg
N. Panyak
Institute of High-Temperature Electrochemistry, Ural Branch of the Russian Academy of Sciences
Email: zhuk@ihte.ru
Yekaterinburg
S. Chernyshev
Institute of High-Temperature Electrochemistry, Ural Branch of the Russian Academy of Sciences
Email: zhuk@ihte.ru
Yekaterinburg
M. Vlasov
Institute of High-Temperature Electrochemistry, Ural Branch of the Russian Academy of Sciences
Хат алмасуға жауапты Автор.
Email: zhuk@ihte.ru
Yekaterinburg
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