Patent ID: 6764584
Filing Date: 2004-07-20
Classification: B01D,B01J,C01D

Abstract:
A process for producing a lithium concentrate from brine comprising the following steps:a) introducing brine into an adsorbent bed so that lithium ions are more strongly adsorbed on an adsorbent of said adsorbent bed in comparison with ions of Na, K, Ca and Mg; b) introducing water into said adsorbent bed so that ions of Na, K, Ca and Mg adsorbed on said adsorbent are desorbed therefrom; c) introducing an acidic solution into said adsorbent bed so that the lithium ions more strongly adsorbed on the adsorbent are desorbed therefrom, and thus a solution having a lithium concentration of 1200-1500 ppm is obtained; d) enriching lithium ions in the solution having a lithium concentration of 1200-1500 ppm from step c) to a lithium concentration of 6000-10000 ppm by electrodialysis; and e) enriching lithium ions in the enriched solution having a lithium concentration of 6000-10000 ppm resulting from step d) to a lithium concentration of 14000-18000 ppm by electrodialysis.