摘要
低温铝电解是铝电解工艺的重要研究方向,熔盐体系的组成对电解温度和电流效率影响较大.为了获得较优的低温熔盐体系组成,在NaF-AlF_(3)-CaF_(2)-Al_(2)O_(3)熔盐体系中添加NaCl和LiF,在840~880℃下电解4 h,分别分析添加剂和Al_(2)O_(3)的质量分数对电流效率的影响.结果表明:添加10%(质量分数,下同)NaCl时电流效率为72.5%,与传统NaF-AlF_(3)-CaF_(2)-Al_(2)O_(3)熔盐体系电解4 h的电流效率相比提高了16.4%;添加2.5%NaCl-7.5%LiF,5%NaCl-5%LiF,7.5%NaCl-2.5%LiF时电流效率约为68%;添加10%LiF时电流效率为57.8%;当Al_(2)O_(3)质量分数为2%时,NaF-AlF_(3)-5%CaF_(2)-10%NaCl-5%LiF熔盐体系电解2 h的电流效率为48.1%,与Al_(2)O_(3)质量分数为3%时的电流效率相比提高了5.2%.
Low temperature aluminum electrolysis is an important research area for energy saving in aluminum electrolysis technology.The composition of the molten salt has a significant effect on the electrolysis temperature and current efficiency.In order to obtain the optimal low-temperature molten salt systems,NaCl and LiF have been added to the NaF-AlF_(3)-CaF_(2)-Al_(2)O_(3)molten salt systems,and the electrolysis has been conducted at 840~880℃for 4 h.The influences of additive and alumina mass fraction on the current efficiency have been analyzed.The results show that when 10%(mass fraction,the same as below)NaCl is added the current efficiency is 72.5%,which is 16.4%higher than that of the traditional NaF-AlF_(3)-CaF_(2)-Al_(2)O_(3)molten salt system.When 2.5%NaCl-7.5%LiF,5%NaCl-5%LiF,and 7.5%NaCl-2.5%LiF are added,the current efficiency is approximately 68%.When 10%LiF is added,the current efficiency is 57.8%.When the mass fraction of Al_(2)O_(3)is 2%,the current efficiency during NaF-AlF_(3)-5%CaF_(2)-10%NaCl-5%LiF molten salt systems electrolysis for 2 h is 48.1%,which is 5.2%higher than that of the Al_(2)O_(3)with the mass fraction of 3%.
作者
薛正铎
郭不拘
牛子儒
张元坤
刘爱民
石忠宁
Xue Zhengduo;Guo Buju;Niu Ziru;Zhang Yuankun;Liu Aimin;Shi Zhongning(Northeastern University School of Metallurgy,Shenyang 110819,China;Northeastern University State Key Laboratory of Rolling and Automation,Shenyang 110819,China)
出处
《材料与冶金学报》
CAS
北大核心
2024年第1期16-22,共7页
Journal of Materials and Metallurgy
基金
国家自然科学基金项目(52074084)。
关键词
低温铝电解
电流效率
NACL
LIF
low temperature aluminum electrolysis
current efficiency
NaCl
LiF
作者简介
薛正铎(1998-),男,硕士研究生,E-mail:980813133@qq.com;通讯作者:石忠宁(1975-),男,教授,博士生导师,E-mail:znshi@mail.neu.edu.cn。
