(河北理工大学 冶金与能源学院，唐山 063009)
摘 要: 用等温饱和法研究温度及熔盐组分对SiO2在KCl-NaCl-NaF体系中溶解度的影响。通过对熔盐急冷试样的X射线衍射分析和对该体系各物质间反应的热力学分析，确定了SiO2的溶解机理。结果表明：SiO2的溶解机理为6NaF(L)+3SiO2(S)=Na2SiF6(L)+2Na2SiO3(L)；SiO2的溶解度随温度的升高、组元NaF摩尔分数的增加而增大，并且在KCl与NaCl摩尔比为1时，SiO2的溶解度与NaF摩尔分数呈线性关系。
关键字: SiO2；KCl-NaCl-NaF；溶解度；溶解机理
（School of Metallurgy and Energy, Hebei Polytechnic University, Tangshan 063009, China）
Abstract:The influence of temperature and component to solubility of SiO2 in KCl-NaCl-NaF molten salt was researched by isothermal saturation method. The dissolving mechanism of SiO2 was confirmed by X-ray diffraction to quench sample of molten salt and thermodynamic analysis to the system. The results show that dissolving mechanism of SiO2 is 6NaF(L)+3SiO2(S)=Na2SiF6(L)+2Na2SiO3(L), the solubility of SiO2 increases with the increase of temperature and of NaF content and appears linearity relation to NaF content at x(KCl)׃x(NaCl)=1.
Key words: SiO2; KCl-NaCl-NaF; solubility; dissolving mechanism
