用于盐湖卤水吸附法提锂的连续离子交换工艺研究

采用连续离子交换技术用于盐湖卤水的吸附法提锂。针对青海一里坪盐湖老卤体系,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20 min、卤水进料量为3.2 BV/h、淋洗水量为2.9 BV/h、解吸水量为9.3 BV/h、解吸温度为15~25 ℃时,连续离子交换系统可以稳定获得镁锂质量浓度比（简称镁锂比）在3左右、锂质量浓度接近1.1 g/L的合格液,锂回收率为98.5%以上。

Study on continuous ion exchange process applied in lithium extraction from salt lake brine with adsorption method

The continuous ion exchange technology was used to extract lithium from the salt lake brine with adsorption method.Aiming at the tailing brine system from Yiliping Salt Lake in Qinghai,a continuous ion exchange adsorption process was developed to extract lithium.The effect of operating parameters on the lithium extraction performance of the continuous ion exchange system was studied.In addition,the long-term stability evaluation was carried out under optimized process conditions.Results showed that,when the stepping rotation period was 20 min,the brine feed flow was 3.2 BV/h,the rinsing water volume was 2.9 BV/h,the desorption water volume was 9.3 BV/h and the desorption temperature range was at 15~25 ℃,a lithium recovery of above 98.5%,a Mg/Li mass concentration ratio of about 3 and a lithium mass concentration of about 1.1 g/L were stably obtained in the performance of the qualified solution with the continuous ion exchange system.