NaF-AlF3-LiF熔盐结构的Raman光谱研究
Study on ionic structure of NaF-AlF3-LiF melts by Raman spectroscopy
低温铝电解是降低铝电解能耗的有效途径，富集锂盐技术是重要的低温铝电解技术。本文采用紫外Raman光谱法研究了不同分子比以及不同LiF含量的NaF-AlF3-LiF熔盐结构，分析了熔盐中离子团的存在状态，以及离子团的结构、"寿命"及相对含量等与温度与配重组成的关系。研究结果表明，在NaF-AlF3-LiF熔盐中，存在着AlF63-和AlF4-结构，当温度升高时，两种结构变得更为松散，离子团内部离子间作用力变大，且"寿命"缩短。AlF63-在高温下更容易分解为AlF4-；而随着熔盐配重组成中LiF含量的增加，AlF4-的相对含量减少，这是由于F-的引入与AlF4-反应生成AlF63-所致的。
Low-temperature aluminum electrolysis is an effective way to decrease the energy consumption of aluminum industry, and enrichment of lithium salts is one of the important technologies of low-temperature aluminum electrolysis. In the present study, molten structure of NaF-AlF3-LiF with different cryolite ratio(CR) and content of LiF was studied by Raman spectroscopy, and the form, structure, "life time" and relative content of the complex ions existing in the melts were researched. The results have shown that AlF63- and AlF4- are existing in NaF-AlF3-LiF melts. When temperature increases, the ionic structure turns loose and "lift time" grows shorter. AlF63 is easier to decompose at higher temperature. With the increase of LiF content, the count of AlF4- is decreased, while AlF63 is increased, which is caused by the shift of balance of the Al-F entities after addition of LiF.
王兆文、刘敬敬、高炳亮、胡宪伟、黄椿森、石忠宁、于江玉
化学冶金技术有色金属冶炼
有色金属冶金NaF-AlF3-LiF熔盐低温铝电解Raman光谱离子结构
nonferrous metallurgyNaF-AlF3-LiF meltslow-temperature aluminum electrolysisRaman spectroscopyionic structure
王兆文,刘敬敬,高炳亮,胡宪伟,黄椿森,石忠宁,于江玉.NaF-AlF3-LiF熔盐结构的Raman光谱研究[EB/OL].(2014-01-17)[2025-08-02].http://www.paper.edu.cn/releasepaper/content/201401-830.点此复制
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