摘要
利用等温饱和法研究温度和熔盐组分对WO_3在KCl-Na Cl-NaF-Na_2WO_4熔盐体系中溶解度的影响。利用热力学软件Factsage6.4对该熔盐体系各物质之间可能存在的反应进行计算,结合X射线衍射对熔盐急冷试样进行分析,确定WO_3的溶解机理。结果表明,WO_3的溶解机理为52Na_2WO_4(l)+96WO_3(s)=49Na2W_2O_7(l)+2NaO_2(l)+2Na2O2(l)+50WO2.9(l),并且WO_3的溶解度随温度的升高而增大,随Na_2WO_4含量增大而减小,随Na F含量升高而先增大后减小,在xNa F=0.385时达最大值。
The influences of the temperature and the molten salt components to the solubility of WO3 in KCl-NaCl-NaF-Na2WO4 molten salt are investigated by the isothermal saturation method. The possible reactions among the materials in the molten salt system are calculated by using the thermodynamic software Factsage 6.4 and the rapid cooling samples of the molten salt are analyzed by the X-ray diffraction, and finally the dissolution mechanism of WO3 is determined. The results show that the dissolving mechanism of WO3 in KCl-NaCl-NaF-Na2WO4 molten salt is 52Na2WO4 （1） ＋ 96WO3 （s） = 49Na2W2O7（1） ＋ 2NaO2（1） ＋ 2Na2O2 （1） ＋ 50WO2.9 （1） , the solubility of WO3 is increased with the increase of the temperature, is decreased with the increase of the Na2WO4 content, and is firstly increased and then decreased with the increase of the NaF content , and the maximum value is reached at xNaF=0.185.
出处
《有色金属工程》
CAS
CSCD
北大核心
2016年第1期37-40,48,共5页
Nonferrous Metals Engineering
基金
国家自然科学基金资助项目(51274082)
