Performance comparison of lithium fractionation from magnesium via continuous selective nanofiltration/electrodialysis

作     者：Yong Xu Qingbai Chen Yang Gao Jianyou Wang Huiqing Fan Fei Zhao Yong Xu;Qingbai Chen;Yang Gao;Jianyou Wang;Huiqing Fan;Fei Zhao

作者机构：Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media PollutionCollege of Environmental Science and EngineeringNankai UniversityTianjin 300350China College of Chemical Engineering and MaterialQuanzhou Normal UniversityQuanzhou 362000China Center for Water and EcologyState Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2023年第59卷第7期

页      面：42-50页

核心收录：

学科分类：08[工学] 0822[工学-轻工技术与工程] 

基　　金：financial support by the National Key Research and Development Program of China(2017YFC0404003) the Tianjin Natural Science Foundation(21JCZDJC00270) the China Postdoctoral Science Foundation(2021M701875) the Tianjin Special Project of Ecological Environment Management Science and Technology(18ZXSZSF00050) the Tianjin Science and Technology Support Project(19YFZCSF00760) the Fundamental Research Funds for the Central Universities(63221312) 

主　　题：High Mg/Li brine Purification Membrane Nanofiltration Electrodialysis Lithium recovery 

摘      要：Although selective nanofiltration(SNF)and selective electrodialysis(SED)have been widely adopted in the field of Mg^(2+)/Li^(+)separation,their differences have not been illustrated *** this study,for the first time,SNF and SED processes in continuous mode were studied for Li+fractionation from the same brine with high Mg/Li ratios and their differences were discussed in *** a fair analysis of the two processes,typical factors were ***,the optimal operating pressure and feed flow rate for SNF were 2.4 MPa and 140 L·h^(-1),respectively,while the optimal cell-pair voltage and replenishment flow rate for SED were 1.0 V and 14 L·h^(-1),*** the Li^(+)fractionation capacity of the two processes were similar,the selectivity coefficient of SNF was 24.7% higher than that of SED and,thus,the Mg/Li ratio in purified stream of the former was 19.0% lower than that of the *** to higher ion driving force,SED had clear advantages in recovery ratio and concentration ***,the specific energy consumption of SED was 20.1% lower than that of *** study provided a better understanding and guidance for the application and improvement of the two technologies.