METHOD AND DEVICE FOR SEPARATING LITHIUM FROM MAGNESIUM AND ENRICHING LITHIUM IN SALT LAKE BRINE

摘要

Provided are a method and a supporting device for separating lithium from magnesium and enriching lithium in salt lake brine. The method comprises the following steps: separating an electrodialysis device into a lithium salt chamber (5) and a brine chamber (4) by an anion exchange membrane (l), filling the brine chamber (4) with salt lake brine, feeding a supporting electrolyte solution free of MgZ⁺ into the lithium salt chamber (5); placing a conductive base material coated with an ion sieve as a cathode (2) in the brine chamber (4); placing a conductive base material coated with a lithium-intercalated ion sieve as an anode (3) in the lithium salt chamber (5); under the drive of external electric potential, enabling Li+ in the brine in the brine chamber (4) to be intercalated into the ion sieve, to form a lithium-intercalated ion sieve, and enabling the lithium intercalated ion sieve in the lithium salt chamber (5) to be restored to an ion sieve after releasing Li⁺ to the conductive solution; after lithium intercalation, discharging the liquid in the brine chamber (4), and adding salt lake brine again, exchanging the electrodes in the two chamber, and repeating the cycle operation, thereby achieving high-efficiency separation of lithium from other ions, and obtaining a lithium-enriched solution. The method has the advantages of short process flow, simple operation, low production cost, continuous operation, and easy industrial application.