WO_3在NaCl-KCl-NaF-Na_2WO_4熔盐体系中的溶解度及溶解机理
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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-Na Cl-Na F-Na_2WO_4 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 WO_3 in KCl-Na Cl-Na F-Na_2WO_4 molten salt is 52Na_2WO_4( l) + 96WO_3( s) =49Na_2W_2O_7( l) + 2NaO_2( l) + 2Na_2O_2( l) + 50WO2. 9( l),the solubility of WO_3 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 Na F content,and the maximum value is reached at xNa F= 0. 185.
The influences of the temperature and the molten salt components to the solubility of WO3 in KCl-Na Cl-Na F-Na_2WO_4 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 WO_3 in KCl-Na Cl-Na F-Na_2WO_4 molten salt is 52Na_2WO_4( l) + 96WO_3( s) =49Na_2W_2O_7( l) + 2NaO_2( l) + 2Na_2O_2( l) + 50WO2. 9( l),the solubility of WO_3 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 Na F content,and the maximum value is reached at xNa F= 0. 185.
引文
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[3]Davis G L,Gentry C H R.The electrodeposition of tungsten[J].Metallurgia,1956,53(1):3-17.
[4]Senderoff S,Mellors G W.Coherent coatings of regractory metals[J].Science,1966,153:1475-1479.
[5]马瑞新,李国勋.熔盐镀钨的历史与发展趋势[J].材料保护,1999,32(2):4-6.
[6]杨昇,李强,顾松青.氧化钪在冰晶石-氧化铝体系中的溶解性能研究[J].稀有金属,2003,27(3):418-420.
[7]路贵民,刘学山.氧化钪在n Na F·Al F3-Sc F3熔盐体系中的溶解[J].中国有色金属学报,1999,9(3):624-626.
[8]陈金钟,李冰,汪瑾,等.氧化镁在Nd Cl3-Na ClKCl-Mg Cl2熔盐中的溶解行为[J].稀有金属,2006,30(2):158-163.
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