Vacuum distillation refining of crude lithium (Ⅱ)──Kinetics on vacuum distillation of crude lithium

来源期刊：中国有色金属学报(英文版)2002年第1期

论文作者：陈为亮 柴立元 闵小波 杨斌 戴永年 于霞 张传福

文章页码：152 - 155

Key words：lithium;refining;vacuum distillation;kinetics

Abstract: Kinetics on vacuum refining process of crude lithium was studied by using maximum evaporation rate,critical pressure and mean free path of elements in the crud e lithium at different temperatures. Behaviors of impurities in the vacuum distillation process have been examined in detail.The results show that fractional vacuum distillation should be taken to obtain lithium with high purity; if the mass loss amount of lithium is 3%～5%, metal K, Na, Mg and Ca can be eliminated at lower temperature of 673～873K at pressure of less than 1.30Pa;the maximum rate of lithium distillation reaches 1.492×10^-1～8.2 44×10^-1g·cm^-2·min^-1 at higher temperature of 973～1073K at the pressure of 3.0～3.2Pa, which ensure complete separation of lithium from Al,Si,Fe and Ni.