公开(公告)号：US20240218483A1

公开(公告)日：2024-07-04

申请号：US18556060

申请日：2022-08-09

Applicant: SUNRESIN NEW MATERIALS CO .LTD

Inventor： Suidang LI ,  Xiaokang KOU ,  Fumin GUO ,  Jia YU ,  Wenjin GAO ,  Lili FAN ,  Kaile CHU ,  Weina BIAN ,  Yao WANG ,  Peng XIANG ,  Qiong LIU

IPC: C22B26/12 ,  C22B3/24 ,  C22B3/42

CPC classification number: C22B26/12 ,  C22B3/24 ,  C22B3/42

Abstract: The present application discloses a lithium extraction method for an alkaline solution, in which a lithium adsorption material is used in an alkaline environment. Lithium ions in the alkaline solution are adsorbed, the lithium adsorption material is replaced with an alkaline high-lithium low-impurity solution, and then an acid solution is used for desorption, so that a high-lithium salt solution having higher lithium content can be obtained. Lithium concentration can reach 5 g/L or more, and the high-lithium salt solution can enter a bipolar membrane system for electrolysis, thereby preparing an alkaline high-lithium low-impurity solution and an acid solution for replacement and desorption of the lithium adsorption material. In the method provided by the present application, lithium in an alkaline solution is adsorbed by resin, and the lithium is preliminarily separated from sodium and potassium. Then, the sodium and the potassium are gradually removed from the resin according to the difference of the retention characteristics of the lithium, the sodium and the potassium on the resin, so that the function of lithium purification is achieved, and lithium concentration is ensured.