膜法盐湖提锂技术研发进展

Research progress on membrane based lithium extraction from salt lakes

膜分离技术已成为中国主流盐湖提锂技术。以2023年发表在国际顶级期刊上的研究成果为基础,从膜改性、工艺参数优化和膜法组合工艺3个方面盘点了膜法盐湖提锂领域的研究进展。分析表明,膜改性研究主要围绕增强膜正电性以及渗透性展开,以克服trade-off效应为重要目标;工艺参数的优化有利于发挥高性能膜的分离潜力,亟待进一步深入研究;多级膜法耦合工艺能够实现超高纯度的Li+富集,是膜法盐湖提锂走向工业应用的重要途径。

Membrane separation technology,the mainstream of lithium extraction from salt lake brine in China,has a great strategic significance for the development of lithium resources and new energy in China.Based on the research results published in top international journals in 2023,this paper reviews the important studies of lithium extraction from salt lake brine by membrane method from the aspects of membrane modification,process parameter optimization,and multiple membrane processes,and provides a reference for the latest developments in the field.Membrane modification research mainly focuses on enhancing the electropositivity and permeability of the membrane,which aims to overcome the trade-off effect.The optimization of process parameters,which is conducive to the separation potential of high-performance membranes,requires further in-depth research.Being capable of realizing ultra-high purity Li+enrichment,the multistage membrane coupling process is an important way for membrane lithium extraction from saline lakes towards industrial application.