无水氯化铝电解过程电解质体系物性研究  

Study on physical properties of electrolyte systemin aluminum trichloride electrolysis process

作　　者：徐志铭 吕国志[1] 王龙[1] 张廷安[1] Xu Zhiming;Lv Guozhi;Wang Long;Zhang Tingan(Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Ministry of Education,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学多金属共生矿生态化冶金教育部重点实验室,辽宁沈阳110819

出　　处：《轻金属》2024年第9期21-26,共6页Light Metals

基　　金：国家自然科学基金(52374353);国家自然科学基金(52304364)

摘　　要：本文对NaCl-KCl-LiCl熔盐体系的物理性质进行了系统研究,实验通过拟合曲线分析了电解质体系内各组分变化对电解质物理性质的影响。实验结果表明:NaCl-KCl-LiCl熔盐体系初晶温度为570~650℃,低于铝的熔点,相对于拜耳-霍尔-埃鲁特法降低了约30%的能耗。与金属铝的密度差为1.49~1.52 g/cm^(3),可以保证电解质与铝液之间良好分离。粘度低于1.2 mPa·s,熔盐流动性较好。在此基础上应该调节电解质配比以增强电解质的电导率,综上,实验得出最佳电解质配比为NaCl(50%)-KCl(10%)-LiCl(40%)。In this paper,the physical properties of NaCl-KCl-LiCl molten salt system are systematically studied,and the effects of the changes of components in electrolyte system on the physical properties of electrolyte are analyzed by fitting curves.The experimental results show that the liquidus temperature of NaCl-KCl-LiCl molten salt system is 570~650℃,which is lower than the melting point of aluminum,and the energy consumption is reduced by about 30%compared with Bayer-Hall-Erut method.The density difference between electrolyte and aluminum is 1.49~1.52 g/cm^(3),which can ensure the good separation between electrolyte and aluminum liquid.When the viscosity is lower than 1.2 mPa·s,the molten salt has good fluidity.On this basis,the electrolyte ratio should be adjusted to enhance the conductivity of the electrolyte.In summary,the best electrolyte ratio is NaCl(50%)-KCl(10%)-LiCl(40%).

关 键 词：氯化物熔盐 初晶温度 密度 粘度 电导率 

分 类 号：TF821[冶金工程—有色金属冶金]