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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >Solubility and precipitation investigations of UO2 in LiF-BeF2 molten salt
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Solubility and precipitation investigations of UO2 in LiF-BeF2 molten salt

机译：UO2在LiF-BeF2熔盐中的溶解度和沉淀研究

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摘要

The 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.
机译：通过化学和电化学方法研究了UO2在600℃下熔融LiF-BEF2（2：1mol）（荷兰）共晶盐的溶解度。溶解实验结果表明，UO2在该熔体中的饱和溶解度为2.37×10（-3）mol / kg，其相应的表观溶解度产品（k'（sp））约为1.67×10（ - 5）摩尔（ 3）/ kg（3）。当加入更多的Li 2 O向浮选-UF4系统中时，由于沉淀形成，电化学环状伏安法（CV）中的U（IV）的阴极峰值电流降低。通过化学计量比（U4 +和O2-）和X射线衍射（XRD）分析确定的化学计量比确定的沉淀物对应于UO 2。与化学分析方法相比，CV技术被证实更加可行，可用于精确测定U（IV）的浓度。同时，在整个氧化物滴定方法中也可以获得k'（sp）值在整个氧化物滴定过程中为1.33×10（3）摩尔（3）/ kg（3），这与来自溶出实验的高度一致。利用K'（SP）的值，可以在PELIBE-UF4系统中理论上估计溶解量的溶解量（氧化物耐受性）。 （c）2020 Elsevier B.v.保留所有权利。

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