V_2O_5在NaCl-KCl-NaF熔盐体系中溶解度及溶解机理
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摘要
利用等温饱和法分别研究温度和熔盐组分对V2O5在Na Cl-KCl-Na F熔盐体系中溶解度的影响。并利用热力学软件Factsage7.0对熔盐体系各组分之间可能发生的化学反应进行计算,着重结合X射线衍射对熔盐急冷试样进行分析,确定了V2O5的溶解机理。结果表明:在该熔盐体系中V2O5优先与Na F发生反应,其溶解机理为4V2O5+6Na F=6Na VO3+2VF3+O2;V2O5的溶解度随温度的升高而增大,随组元Na F摩尔分数的增大而增大。
The influence of temperature and molten salt component on the solubility of V_2O_5 in Na Cl-KCl-Na F molten salt system was researched by isothermal saturation method. The possible reactions between the materials in the molten salt system were calculated by using the thermodynamic software Factsage7. 0,and the dissolution mechanism of V2O5 was finally determined by combination with the X-ray diffraction analysis of the rapid cooling samples of molten salt. The results show that V_2O_5 preferentially reacts with Na F in the molten salt system by the following dissolving mechanism of 4V_2O_5+ 6Na F = 6Na VO3+ 2VF3+ O_2. The solubility of V_2O_5 increases with increase in temperature and Na F content in the molten salt system.
The influence of temperature and molten salt component on the solubility of V_2O_5 in Na Cl-KCl-Na F molten salt system was researched by isothermal saturation method. The possible reactions between the materials in the molten salt system were calculated by using the thermodynamic software Factsage7. 0,and the dissolution mechanism of V2O5 was finally determined by combination with the X-ray diffraction analysis of the rapid cooling samples of molten salt. The results show that V_2O_5 preferentially reacts with Na F in the molten salt system by the following dissolving mechanism of 4V_2O_5+ 6Na F = 6Na VO3+ 2VF3+ O_2. The solubility of V_2O_5 increases with increase in temperature and Na F content in the molten salt system.
引文
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[2]Wang Xiaoli,Zhang Yu,Zhang Huamin.Latest progresses in vanadium flow battery technologies and applications[J].Journal of Electrochemistry,2015,21(5):433-440.(王晓丽,张宇,张华民.全钒液流电池储能技术开发与应用进展[J].电化学,2015,21(5):433-440.)
[3]Yang Biao,Wang Lige,Wang Enze.Research progress in fusion of V-Cr-Ti alloy[J].Materials Review,2014,28(3):143-146.(杨彪,王丽阁,王恩泽.聚变用V-Cr-Ti合金的研究进展[J].材料导报,2014,28(3):143-146.)
[4]Cai Xiaochu.Discussing the main difficulties and development prospects of refractory metal smelting[J].Chinese Journal of Rare Metals,1979(4):30-38.(蔡小初.试论难熔金属熔盐电解的主要困难与发展前景[J].稀有金属,1979(4):30-38.)
[5]Liu Jianmin,Lu Xionggang,Li Qian,et al.Prospect and retrospect of fused salt electrolysis process for producing refractory metals[J].Rare Metals Letters,2006,25(9):1-6.(刘建民,鲁雄刚,李谦,等.熔盐电解制备难熔金属的现状与展望[J].稀有金属快报,2006,25(9):1-6.)
[6]Prabhat Kumar Tripathy,Jag Mohan Juneja.Preparation of high purity vanadium metal by silicothermic reduction of oxides followed by electrorefining in a fused salt bath[J].High Temperature Materials and Processes,2004,23:237-245.
[7]Du Jihong,Li Qingyu,Yang Shenghong,et al.Preparation of Ti V alloy by electrolysis-deoxidization in molten salt[J].Rare Metal Materials and Engineering,2009,38(12):2230-2233.(杜继红,李晴雨,扬升红,等.熔盐电解脱氧制备Ti V合金[J].稀有金属材料与工程,2009,38(12):2230-2233.)
[8]Wang Shulan,Li Shichao,Gu Dongyan.Preparation of vanadium metal by moltal salt electrolysis[J].Iron Steel Vanadium Titanium,2012,33(1):20-23.(王淑兰,李世超,顾东燕.熔盐电解制备金属钒[J].钢铁钒钛,2012,33(1):20-23.)
[9]He Xiaofeng,Li Yungang,Tian Wei,et al.Solubility and dissolving mechanism of Si O2in KCl-Na Cl-Na F molten salt[J].The Chinese Journal of Nonferrous Metals,2008,18(5):929-933.(何小凤,李运刚,田薇,等.Si O2在KCl-Na Cl-Na F体系中的溶解度及溶解机理[J].中国有色金属学报,2008,18(5):929-933.)
[10]Yang Sheng,Li Qiang,Gu Songqing.Solubility of Sc2O3in n Na F·Al F3-Al2O3melts[J].Chinese Journal of Rare Metals,2003,27(3):418-420.(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.)
[11]Lu Guimin,Liu Xueshan.Dissolution of Sc2O3in fluoride molten salt[J].The Chinese Journal of Nonferrous Metals,1999,9(3):624-626.(路贵民,刘学山.氧化钪在n Na F·Al F3-Sc2O3熔盐体系中的溶解[J].中国有色金属学报,1999,9(3):624-626.)
[12]Chen Jinzhong,Li Bing,Wang Jing,et al.Solubility of molten salt of Nd Cl3-Na Cl-KCl-Mg Cl2[J].Chinese Journal of Rare Metals,2006,30(2):158-163.(陈金钟,李冰,汪瑾,等.氧化镁在Nd Cl3-Na Cl-KCl-Mg Cl2熔盐中的溶解行为[J].稀有金属,2006,30(2):158-163.)
[13]Gao Yunming,Zengzhi,Pan Jinhua.Solubility of Fe2O3in molten salts of borax[J].Journal of Wuhan University of Science and Technology(Natural Science Edition),2006,29(6):552-554.(高运明,曾智,潘金华.氧化铁在硼砂熔盐中溶解度研究[J].武汉科技大学学报:自然科学版,2006,29(6):552-554.)
[14]Ren Wanzhong,Chen Xiaoping,Yu Weiqian,et al.Solubility of rare earth oxychloride in melt of cryolite[J].Journal of the Chinese Society of Rare Earths,2001,19(4):343-345.(任万忠,陈小平,于维谦,等.稀土氧氯化物在冰晶石-氧化铝熔体中的溶解度[J].中国稀土学报,2001,19(4):343-345.)