铝电解质中的锂盐浓度限值的探讨  

Discussion on the concentration limit of lithium in aluminum electrolyte

作　　者：张延利 邱仕麟 Zhang Yanli;Qiu Shilin(Zhengzhou Non-ferrous Metals Research Institute Limited Company of CHALCO,Zhengzhou 450041 ,China)

机构地区：[1]中铝郑州有色金属研究院有限公司

出　　处：《轻金属》2019年第8期32-35,共4页Light Metals

摘　　要：本文通过过剩鼠化铝及电解温度与电流效率的关系研究,确定了电解槽能获得较高电流效率的过剩氟化铝和能保证氧化铝溶解的电解温度范围,在此范围内,要获得较高的电流效率,电解质中锂盐含量应控制在2%以下,随着锂盐的富集,要保证电解槽正常运行其锂盐浓度限值范围大致为5.6%~7.0%,此范围随电解质成分不同略有变化。若电解质中锂盐的富集量超过此限值时,将会影响电解槽的正常运行,则需寻找可行方法控制电解质中锂盐的进一步富集。Based on analysis of the relationship between excess aluminium fluoride, electrolyte temperature and current efficiency in this paper, the range of electrolyte temperature is determined in which excess aluminium fluoride with high current efficiency can be obtained and alumina can be dissolved. In this range, in order to obtain high current efficiency, the lithium salt concentration in electrolyte should be controlled below 2%. Along with the enrich ment of lithium salt, and in order to ensure the normal operation of reduction cells, the limit range of lithium salt concentration should be about 5.6%~ 7. 0%, which varies slightly with the electrolyte composition. If the lithium salt concentration in the electrolyte exceeds this limit, it will affect the normal operation of reduction cells. It is then necessary to find out a feasible method to control the further enrichment of lithium salt in the electrolyte.

关 键 词：铝电解 锂 电流效率 

分 类 号：TF821[冶金工程—有色金属冶金]