US 12,264,382 B2
Method for extracting lithium using resin adsorbent to pretreat low-grade deep brines
Yuqing Zhao, Qinghai Province (CN); Yongpeng Ying, Qinghai Province (CN); Xin Xiong, Qinghai Province (CN); Hongshu Fang, Qinghai Province (CN); He Jiao, Qinghai Province (CN); Liping Wu, Qinghai Province (CN); Fang Jin, Qinghai Province (CN); Dao Liu, Qinghai Province (CN); and Haiming Li, Qinghai Province (CN)
Assigned to Qinghai Geological and Mineral Testing Center, Qinghai Province (CN)
Filed by Qinghai Geological and Mineral Testing Center, Qinghai Province (CN)
Filed on Jan. 14, 2022, as Appl. No. 17/576,348.
Prior Publication US 2023/0227937 A1, Jul. 20, 2023
Int. Cl. C22B 3/42 (2006.01); C22B 26/12 (2006.01)
CPC C22B 3/42 (2013.01) [C22B 26/12 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for extracting lithium using a resin adsorbent to pretreat low-grade deep brines, including the following steps:
(1) concentrating a low-grade deep brine to obtain a concentrated brine;
(2) subjecting the concentrated brine obtained in step (1) to a first adsorption with a resin adsorbent to obtain a lithium extraction mother liquor;
(3) subjecting the lithium extraction mother liquor obtained in step (2) to a secondary adsorption with a manganese-based lithium adsorbent to obtain an adsorbed manganese-based lithium adsorbent;
(4) desorbing the adsorbed manganese-based lithium adsorbent obtained in step (3) using a desorbent to obtain a lithium precipitation mother liquor;
(5) sequentially subjecting the lithium precipitation mother liquor obtained in step (4) to impurity removal, concentration by evaporation, and lithium precipitation with sodium carbonate to obtain lithium carbonate.