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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 6    December 2001

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Vacuum distillation refining of crude lithium (Ⅰ)
──Thermodynamics on separating impurities from lithium
CHEN Wei-liang(陈为亮)1, YANG Bin(杨  斌)2, CHAI Li-yuan(柴立元)1,
MIN Xiao-bo(闵小波)1, DAI Yong-nian(戴永年)2,  YU Xia(于  霞

1. Department of Metallurgical Science & Engineering,
Central South University, Changsha 410083, P.R.China;
2. Research Institute of Vacuum Metallurgy & Material, Kunming University of
Science and Technology, Kunming 650093, P.R.China

Abstract: Thermodynamics on vacuum refining process of the crude lithium has been studied by using separation coefficients of impurities in the crude lithium and vapor-liquid equilibrium composition diagrams of Li-i binary alloy (i stands for an impurity) at different temperatures. Behaviors of impurities in the vacuum distillation process have been examined. The results show that fractional vacuum distillation should be taken to obtain metal lithium with high purity more than 99.99% Li, in which metal K, Na and partial Mg are volatilized at lower temperature of 673~873K.Lithium is distilled from the residual liquid containing other impurities, such as Ca, Mg, Al, Si, Fe and Ni at higher temperature of 873~1073Kand the chamber pressure is less than the critical pressure of lithium.

 

Key words:  lithium; refining; vacuum distillation; thermodynamics

ISSN 1672-7029
CN 43-1423/U

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