四氟铝酸钾对高锂电解质低温铝电解的影响  

The influence of KAlF_4 on low temperature aluminum electrolysis for lithium-rich electrolyte

作　　者：陈位杰 王维[1,2] 张洪涛 Chen Weijie;Wang Wei;Zhang Hongtao(College of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Collaborative innovation Center of Nonferrous Metals Henan Province,Luoyang 471023,China;Yichuan Power Group Corporation,Yichuan 471312,China)

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]有色金属共性技术河南省协同创新中心,河南洛阳471023 [3]伊川电力集团总公司,河南伊川471312

出　　处：《轻金属》2019年第1期40-43,共4页Light Metals

基　　金：国家自然科学基金资助项目(U1704154)

摘　　要：为了研究KAlF_4对高锂电解质物理化学性质的影响,分别采用步冷曲线法和旋转刚玉片质量损失法测量不同KAlF_4含量高锂电解质的初晶温度和氧化铝溶解度。通过X射线衍射和高倍电镜分析,研究了氧化铝溶解到高锂电解质的微观结构和物相成分。结果表明,电解质中的Li^+易与AlF_5^(2-)反应生成LiNa2_AlF_6,降低了氧化铝在电解质溶解度。高锂电解质中加入适量的KAlF_4能够降低初晶温度、提高氧化铝溶解度,达到低温铝电解的目的。本工作对高锂电解质低温铝电解生产具有理论指导意义。In order to study the influence of KAlF4 on the physicochemical property of lithium-rich electrolyte,the liquidus temperature and the solubility of Al2O3 were tested for lithium-rich electrolyte with different content of KAlF4 by cooling curve and the mass loss of rotating sintered corundum disc,respectively.The components and microstructure of the lithium-rich electrolyte were studied by X-ray diffraction(XRD)and scanning electron microscopy(SEM).The results show that the solubility of Al2O3 in the electrolyte could be decreased by LiNa2AlF6 generated easily through the reaction between Li^+and AlF5^2-.It could result in decreasing the liquidus temperature and improving the solubility of Al2O3 adding proper amount of KAlF4 to lithium-rich electrolyte,for low-temperature aluminum electrolysis purposes.This work has important theory guidance significance for the production of lithium-rich electrolyte during low-temperature aluminum electrolysis.

关 键 词：铝电解 高锂电解质 四氟铝酸钾添加剂 初晶温度 溶解性 

分 类 号：TF821[冶金工程—有色金属冶金]