Abstract
The fluorination of UF4 by F2 in LiF-NaF-KF(46.5-11.5-42 mol%, FLiNaK), FLiNaK-ThF4(88.0–12.0 mol.%) and KF-ZrF4(58–42 mol%, FKZr) at 550 °C was investigated, and the results indicated the conversion rate of UF4 to UF6 was different in FLiNaK with the other two molten salts. Raman spectroscopy and X-ray diffraction (XRD) were used to study the influence of the fluoroacidity on the coordination structure of Zr (IV) and U(IV) in FLiNaK with various contents of ZrF4. The results indicated that the concentration of free F− decreased and the molten salt became more acidic with the increase of ZrF4 content. The main Zr(IV) complex present changed from ZrF73−, ZrF62− to ZrF5− as the U(IV) complex changed from UF84− or UF73− to UF62−. The fluorination of UF4 in FLiNaK with various fluoroacidity suggested that a higher fluoroacidity of molten salts resulted in relatively low coordination numbers of Zr-F and U-F, a higher conversion rate and average reaction rate of UF4 to UF6, and less corrosive of the structural material.
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