高镁锂比盐湖卤水镁锂分离工艺

以酸化提硼后卤水为原料,采用饱和氯化钾溶液作为沉镁剂,使用三步结晶法进行了沉淀镁并富集锂的研究。结果表明,通过3段蒸发结晶析出光卤石,可以有效地实现镁锂分离:添加95%理论用量的氯化钾可以把原卤水中的镁锂质量比由10.1∶1降低到0.39∶1,锂在滤液中总回收率为77.90%,并使锂浓度从10 g/L富集到49.30 g/L。

Technique for Separating Magnesium and Lithium from Salt Lake Brine with High Mg/Li Ratio

With the salt lake brine after boron recovery as raw material and saturated solution of potassium chloride for magnesium precipitation, research was carried out on separating lithium from magnesium by the process of three?step evaporation crystallization. The experimental results show that the separation between lithium and magnesium could be attained after carnallite precipitation through three?step evaporation crystallization. The mass ratio of magnesium to lithium was reduced from 10.1∶1 to 0.39∶1 with the addition of potassium chloride at 95% of theoretical amount, resulting in the total Li+ recovery from the filtrate reaching 77.90%, and Li+ concentration enriched from 10 g/L to 49.30 g/L.