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Solubility and precipitation investigations of UO2 in LiF-BeF2 molten salt
Peng, H; Huang, W; Xie, LD; Li, QN
2020
Source PublicationJOURNAL OF NUCLEAR MATERIALS
ISSN0022-3115
Volume531Pages:-
Subtype期刊论文
AbstractThe solubility of UO2 in molten LiF-BeF2 (2:1 mol) (FLiBe) eutectic salt at 600 degrees C was studied by chemical and electrochemical methods. The results of dissolution experiment showed that the saturated solubility of UO2 in this melt was 2.37 x 10(-3) mol/kg and its corresponding apparent solubility product (K'(sp)) was approximately 1.67 x 10(-5) mol(3)/kg(3). When more Li2O were added to the FLiBe-UF4 system, the cathodic peak current of U(IV) in the electrochemical cyclic voltammetry (CV) curve accordingly decreased because of precipitate formation. The precipitate corresponded to UO2 as determined by stoichiometric ratio (concentration variation of U4+ and O2-) and X-ray diffraction (XRD) analysis. Compared to the chemical analysis method, the CV technique was confirmed to be more feasible for accurate determination of concentration of U(IV). Meanwhile, the K'(sp) value was also obtained to be 1.33 x 10(-5) mol(3)/kg(3) during the whole oxide titration procedure, which was highly consistent with that from the dissolution experiment. With the value of K'(sp), the allowable amount of dissolved oxide ions (oxide tolerance) can be theoretically estimated in the FLiBe-UF4 system. (C) 2020 Elsevier B.V. All rights reserved.
KeywordLIF-NAF-KF ELECTROCHEMICAL SEPARATION URANIUM THERMODYNAMICS ADSORPTION REDUCTION FLUORIDES CHEMISTRY REACTORS THORIUM
DOI10.1016/j.jnucmat.2020.152004
Indexed BySCI ; EI
Language英语
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/33144
Collection中科院上海应用物理研究所2011-2020年
AffiliationChinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China
Recommended Citation
GB/T 7714
Peng, H,Huang, W,Xie, LD,et al. Solubility and precipitation investigations of UO2 in LiF-BeF2 molten salt[J]. JOURNAL OF NUCLEAR MATERIALS,2020,531:-.
APA Peng, H,Huang, W,Xie, LD,&Li, QN.(2020).Solubility and precipitation investigations of UO2 in LiF-BeF2 molten salt.JOURNAL OF NUCLEAR MATERIALS,531,-.
MLA Peng, H,et al."Solubility and precipitation investigations of UO2 in LiF-BeF2 molten salt".JOURNAL OF NUCLEAR MATERIALS 531(2020):-.
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