- PII
- S30345715S0235010625050109-1
- DOI
- 10.7868/S3034571525050109
- Publication type
- Article
- Status
- Published
- Authors
- Volume/ Edition
- Volume / Issue number 5
- Pages
- 537-551
- Abstract
- 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-LiO melt, with a LiO 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 and 2.4∙10 mol.% at 5 and 9 mol.% LiO respectively. In case of neodymium oxide its solubility in the LiCl-LiO melt increases linearly from 1.5∙10 mol.% at 2 mol.% LiO to 6.4∙10 mol.% at 9 mol.% LiO. 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 NdO versus 145 hours for CeO). 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-LiO 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 LiCeO (for Ce) and LiCeO (for Ce), which causes the slow kinetics and nonlinear dependence on the LiO content. Neodymium oxide interacts with lithium oxide in the melt, forming a soluble lithium neodymate compound LiNdO2.
- Keywords
- оксид церия оксид неодима хлорид лития оксид лития растворимость метод изотермического насыщения спектроскопия оптического поглощения
- Date of publication
- 01.05.2025
- Year of publication
- 2025
- Number of purchasers
- 0
- Views
- 11
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