粗锂真空蒸馏脱钠的实验研究

Vacuum Distillation of Crude Lithium to Eliminate Sodium

从理论上分析了真空蒸馏分离粗锂中杂质钠的可行性。在内热式真空炉内进行了粗锂脱钠的小型实验研究．考察了蒸馏温度和蒸馏时间对脱钠效果的影响，得到了最佳工艺条件：原料量为10g左右，真空度控制在10Pa以下，当原料含钠量为0．66％时，在673K下蒸馏2个小时，残余物含钠量降至0．0018％，远低于电池级精锂含钠量不大于0．02％的要求。良好的实验结果表明，粗锂真空蒸馏脱钠具有工艺流程简单、改善劳动环境及提高生产率等优点．是一种去除粗锂中杂质钠的有效方法。

t Feasibility of eliminating sodium of crude lithium by vacuum distillation was theoretically studied and experimentally tested. The small-scale experiments were carried through in internal-heating vacuum furnace, the influence of temperature and time upon eliminating sodium were inspected. The optimized conditions are found to be the following： 10g crude Lithium, at distillation temperature of 673K and a distillation time of 2 hours under the pressure of 10Pa. The content of sodium in crude lithium is reduced from 0.66% to 0.0018% in a single stage distillation process. The results show many strengths of the technique, such as high efficiency ,environment friendliness and simple operation.