TiO_2在NaCl-KCl-NaF熔盐体系中的初晶温度及溶解机理研究
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摘要
采用差热分析法测定KCl-NaCl-NaF-(TiO_2)体系的初晶温度,根据测定的数据得出了KCl-NaClNa F-(TiO_2)熔盐体系初晶温度,分析了组元NaF对KCl-NaCl-NaF-(TiO_2)体系初晶温度的影响。通过HSC热力学计算出该体系在高温下的反应,并通过XRD物相分析出在KCl-NaCl-NaF体系下TiO_2的溶解机理。结果表明:KCl-NaCl-NaF-(TiO_2)体系初晶温度随着组元Na F摩尔含量的增加而增大,同时通过对熔盐的X射线衍射分析及各物质间反应的热力学分析,表明TiO_2对KCl-NaCl-NaF体系初晶温度影响很小,TiO_2在KCl-NaCl-NaF体系的溶解行为为化学溶解。
The primary crystal temperature of KCl-NaCl-NaF-(TiO_2) system was determined by differential thermal analysis. According to the measured data, the initial temperature of KCl-NaCl-NaF-(TiO_2) molten salt system was obtained, and the influence of NaF on the initial temperature of KCl-NaCl-NaF-(TiO_2) system was analyzed. The reaction of the system was calculated by HSC thermodynamics at high temperature, and the dissolution mechanism of TiO_2 in the KCl-NaCl-NaF system was analyzed by XRD phase. The results show that KCl-NaCl-NaF-(TiO_2) system of liquidus temperature with increasing element molar concentration of Na F increases, while the thermodynamic X ray diffraction analysis of molten salt and the material response thermodynamics analysis showed that the influence of the liquidus temperature of TiO_2 in the KCl-NaCl-NaF system is little, the dissolution behavior of TiO_2 in KCl-NaCl-NaF system is chemical dissolution.
The primary crystal temperature of KCl-NaCl-NaF-(TiO_2) system was determined by differential thermal analysis. According to the measured data, the initial temperature of KCl-NaCl-NaF-(TiO_2) molten salt system was obtained, and the influence of NaF on the initial temperature of KCl-NaCl-NaF-(TiO_2) system was analyzed. The reaction of the system was calculated by HSC thermodynamics at high temperature, and the dissolution mechanism of TiO_2 in the KCl-NaCl-NaF system was analyzed by XRD phase. The results show that KCl-NaCl-NaF-(TiO_2) system of liquidus temperature with increasing element molar concentration of Na F increases, while the thermodynamic X ray diffraction analysis of molten salt and the material response thermodynamics analysis showed that the influence of the liquidus temperature of TiO_2 in the KCl-NaCl-NaF system is little, the dissolution behavior of TiO_2 in KCl-NaCl-NaF system is chemical dissolution.
引文
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