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Ion concentration polarization (ICP) is a promising mechanism for concentrating and/or separating charged molecules. This work simulates the extraction of Li + ions in a diluted high Mg 2+ /Li + ratio salt lake brines based on free flow ICP focusing (FF-ICPF). The model solution of diluted brine continuously flows through the system with Li + slightly concentrated and Mg 2+ significantly removed by ICP driven by external pressure and perpendicular electric field. In a typical case, our results showed that this system could focus Li + concentration by ~1.28 times while decreasing the Mg 2+ /Li + ratio by about 85% (from 40 to 5.85). Although Li + and Mg 2+ ions are not separated as an end product, which is preferably required by the lithium industry, this method is capable of decreasing the Mg 2+ /Li + ratio significantly and has great potential as a preprocessing technology for lithium extraction from salt lake brines.

membranes

Numerical Simulation of Continuous Extraction of Li+ from High Mg2+/Li+ Ratio Brines Based on Free Flow Ion Concentration Polarization Microfluidic System