公开(公告)号：US20210139339A1

公开(公告)日：2021-05-13

申请号：US16605127

申请日：2018-04-13

Applicant: Ecostar-Nautech Co., Ltd.

Inventor： Aleksandr Dmitriyevich RIABTSEV ,  Natalya Pavlovna KOTCUPALO ,  Valeriy Ivanovich TITARENKO ,  Larisa Timofeyevna MENZHERES ,  Elena Viktorovna MAMYLOVA ,  Aleksandr Aleksandrovich KURAKOV ,  Nikolay Mikhaylovich NEMKOV ,  Andrey Aleksandrovich KURAKOV ,  Sergei Aleksandrovich ANTONOV ,  Elizaveta Petrovna GUSHCHINA

IPC: C01D15/04 ,  B01J47/02 ,  C01D15/08

Abstract: Method for preparing lithium concentrate from natural lithium-bearing brines was developed. The brine is first subjected to purification from the suspended solids, then filtered through a static layer of the granulated sorbent based on the LiCl-2Al(OH)3-mH20, where m=3-5, to obtain primary lithium concentrate. The process is carried out in sorption-desorption units consisting of 4 columns, two of which are in the process of lithium chloride from the brine, one column is in the process of washing the sorbent saturated with lithium chloride from the brine, and one column is in the process of lithium chloride desorption. Primary lithium concentrate is converted to a secondary lithium concentrate by concentration in evaporative pools or reverse-osmotic concentration-desalination. Secondary lithium concentrate is used for further production of lithium chloride or lithium carbonate. Invention increases recovery of lithium chloride during sorption enrichment of natural lithium brines, improves the quality of lithium chloride and lithium carbonate obtained, widens the range of lithium-bearing hydromineral raw materials suitable for the production of lithium compounds, by using lithium-bearing natural brines containing suspended particles.