钛系锂离子筛在沉锂母液锂回收上的连续离子交换工艺研究

Study on Continuous Ion Exchange Process of Titanium Lithium Ion Sieve for Lithium Recovery from Mother Liquor of Lithium Precipitation

利用钛系锂离子筛用于沉锂母液的吸附法提锂。针对青海蓝科锂业沉锂母液体系,开发了连续离子交换吸附提锂工艺,研究了操作参数对连续离子交换系统提锂性能的影响,并在优化的工艺条件下进行了长周期的稳定性评价。结果表明,在转动步进周期为10 min、卤水进料量为16.7 BV/h、淋洗水量为6 BV/h、解吸水量为12~13 BV/h,酸浓度为0.3 mol/L时,连续离子交换系统可以稳定获得钠锂质量浓度比(简称钠锂比)在0.6左右、锂质量浓度接近1.3 g/L的合格液,锂回收率为94.5%以上。

Lithium extraction by adsorption method using titanium-based lithium ion sieve for lithium precipitation mother liquor. Aiming at the mother liquor system of Lithium Precipitation in Qinghai Lanke Lithium Industry, a continuous ion exchange adsorption lithium extraction process was developed, and the influence of operating parameters on the performance of continuous ion exchange system for lithium extraction was studied, and under the optimized process conditions, a long-term stability evaluation was carried out. The results show that when the rotation steps period is 10 min, the brine feed rate is 16.7 BV/h, the rinse water rate is 6 BV/h, the resorption water rate is 12 to 13 BV/h, and the acid concentration is 0.3 mol/L, The continuous ion exchange system can stably obtain a qualified solution with a sodium-lithium mass concentration ratio(referred to as sodium-lithium ratio) around 0.6 and a lithium mass concentration close to 1.3 g/L,and the lithium recovery rate is above 94.5 %.