(河北理工大學 冶金與能源學院，唐山 063009)
摘 要: 用等溫飽和法研究溫度及熔鹽組分對SiO2在KCl-NaCl-NaF體系中溶解度的影響。通過對熔鹽急冷試樣的X射線衍射分析和對該體系各物質(zhì)間反應(yīng)的熱力學分析，確定了SiO2的溶解機理。結(jié)果表明：SiO2的溶解機理為6NaF(L)+3SiO2(S)=Na2SiF6(L)+2Na2SiO3(L)；SiO2的溶解度隨溫度的升高、組元NaF摩爾分數(shù)的增加而增大，并且在KCl與NaCl摩爾比為1時，SiO2的溶解度與NaF摩爾分數(shù)呈線性關(guān)系。
關(guān)鍵字: SiO2；KCl-NaCl-NaF；溶解度；溶解機理
（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
