陶瓷超滤膜用于盐湖卤水提锂合格液的中试研究

为解决纳滤膜用于盐湖卤水镁锂分离中长时间运行后出现通量下降、膜污染和分离效率下降的问题,开展了将陶瓷超滤膜作为纳滤预处理措施用于盐湖卤水提锂合格液的中试研究。中试设在吸附提锂车间,进水为提锂工序中的合格液。结果表明,在冬天低温环境合格液浊度<50 NTU的条件下,以及在合格液浊度上升至50~170 NTU的极端进水水质条件下,陶瓷超滤膜均可在300 L/（m ²·h）的测试通量下稳定运行,过滤时间为30~50 min/周期。产水浊度稳定<0.1 NTU,优于后续纳滤系统进水要求。

Pilot study of ceramic ultrafiltration membrane for qualified lithium-extraction solution from salt lake brine

To solve the problem of flux depression,membrane fouling and separation efficiency decline of nanofiltration mem-brane after long term operation in the separation of Mg ²⁺/Li ⁺ from salt lake brine,the pilot-scale study using ceramic ultrafil-tration membrane as a nanofiltration pretreatment measure for qualified lithium extraction solution from salt lake brine was conducted.The pilot facility was set in the lithium extraction workshop and the qualified solution from lithium extraction pro-cess was used as influent.The results showed that,the ceramic ultrafiltration membrane continuously and stably ran under the flux of 300 L/（m ²·h） both under the normal water quality conditions of influent turbidity below 50 NTU at low temperature in winter and under the condition of extreme influent turbidity of qualified liquid rising to 50~170 NTU,the filtration time was in the range of 30~50 min/cycle.The permeate turbidity was stably below 0.1 NTU,which was better than the influent quality re-quirement of subsequent nanofiltration.