Lithium extraction from high magnesium salt lake brine with an integrated membrane technology

作者：Ashraf, Muhammad Awais^*; Usman, Muhammad; Hussain, Iftikhar; Ahmad, Faraz; Guo, Shiwei; Zhang, Lu

来源：SEPARATION AND PURIFICATION TECHNOLOGY, 2022, 302: 122163.

DOI：10.1016/j.seppur.2022.122163

• Integrated membrane
• Lithium extraction
• Nanofiltration
• Mg 2+
• Li plus ratio

Lithium extraction is a great challenge from the high magnesium content salt solution. In this work, an integrated polyamide tight ultrafiltration (UF) and nanofiltration (NF) membranes are systematically investigated to separate Li+ from a high magnesium salt solution. Tight ultrafiltration UA001 and nanofiltration NF270 mem-branes in the integrated-cascade system not only increased Li+ permeation to 82.5 % but also enhanced the high Mg2+ retention to 94.6 % from the ternary salt solution of LiCl and MgCl2. The solution-diffusion transport model was also developed to calculate the real retention of Li+ and Mg2+, under constant pressure mode. The separation efficiency SFLi/Mg for the ternary salt solution of LiCl + MgCl2 + H2O was more than 15 at a constant pressure of 25 bars with an integrated membrane process, which was higher as compared to single-stage UF and NF270 membranes. Moreover, the high Mg2+/Li+ ratio was also reduced from 30 to 1.9 in the integrated-cascade membrane process.

• 单位
  1; 复旦大学; 6; 中国科学院; 中国科学院研究生院