低碳盐湖提锂:高渗透选择性纳滤膜和正渗透膜材料

Low Carbon Salt-lake Lithium Extraction: High Permselective Nanofiltration Membranes and Forward Osmosis Membranes

中文关键词:  盐湖提锂  镁锂分离  层层自组装纳滤膜  正渗透膜  

英文关键词:Lithium extraction from salt-lake brine  Mg2+/Li+ separation  Layer by layer nanofiltration membrane  Forward osmosis membrane

中文摘要:

      报道了联合基金项目“面向青海盐湖卤水锂提取过程强化的高性能中空纤维正渗透膜材料的设计研究”的最新进展。研究从吸附/解吸或稀释盐湖卤水出发，采用“纳滤－正渗透膜”耦合工艺纯化和浓缩Li+浓度至3 wt.%用于碳酸锂沉淀。研究重点是制备高渗透分离性能的层层自组装中空纤维纳滤膜和正渗透膜材料。通过基膜孔结构和物化性能与层层自组装纳滤膜性能和界面聚合正渗透膜性能之间的关系研究及系列技术攻关，已完成四寸中空纤维纳滤膜和正渗透膜的制备，技术指标达到项目指标。项目研究为青海盐湖锂提取提供了核心的分离和浓缩膜材料。

英文摘要:

      The paper reported the progress of our project supported by NSFC， “Hollow fiber forward osmosis membranes for process intensification of lithium recovery from Qinghai salt-lake brine”. The project targets at the lithium enriched brine after adsorption/desorption or diluted salt-lake brine. An NF-FO hybrid process is proposed to purify and concentrate Li+ up to 3 wt.% for precipitation of Li2CO3. The project focuses on high perm-selective layer-by-layer (LBL) hollow-fiber (HF) NF membranes and FO membranes. Starting from the design of the support membrane， the study aim to unravel the scientific correlation between physicochemical characteristics of the substrate as well as the pore structure and the performance of the LBL NF membrane and thin film composite FO membrane by interfacial polymerization. We have successfully prepared 4-inch HF LBL NF module as well as 4-inch FO module with properties close to the project set values. The results provide core separation and concentration membrane materials for extraction of Li+ from Qinghai salt-lake brine. Success of this project paves a solid material basis for the sustainable development of China's electric vehicle industry.