Pyrohydrolysis of Li3AlF6 Molten Salt
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Graphical Abstract
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Abstract
Here, Li3AlF6 was adopted as a substitute salt for LiF-BeF2 to study its pyrohydrolysis behavior in the mixed molten salts. Different molar rations of Li3AlF6 was firstly prepared, with its structure being characterized using X-ray diffraction (XRD), raman spectroscopy, thermogravimetry (TG), and differential scanning calorimetry (DSC) respectively. The pyrohydrolysis behavior of Li3AlF6 was carried out on our self-made apparatus. The results indicate that Li3AlF6 with different crystal structures can be synthesized by varying the conditions like temperature and LiF/AlF3 molar ratio. LiAlO2 in the absence of F- ions is confirmed to be the pyrohydrolysis product of Li3AlF6, indicating that the complete conversion of the fluorides into the corresponding oxides, which can provide fundamental information for the following experiments in the aqueous-reprocessing process.
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