METHOD AND SYSTEM FOR PREPARING BATTERY-GRADE, HIGH-PURITY-GRADE LITHIUM HYDROXIDE AND LITHIUM CARBONATE FROM HIGH-IMPURITY LITHIUM SOURCE

Title:

METHOD AND SYSTEM FOR PREPARING BATTERY-GRADE, HIGH-PURITY-GRADE LITHIUM HYDROXIDE AND LITHIUM CARBONATE FROM HIGH-IMPURITY LITHIUM SOURCE

Document Type and Number:

WIPO Patent Application WO/2020/147224

Kind Code:

A1

Abstract:

Provided is a method for preparing battery-grade, high-purity-grade lithium hydroxide and lithium carbonate from high-impurity lithium source and a system therefor. The method comprises the following steps: A. preparation of a lithium salt refined liquid: removing impurities by means of a physicochemical method and deeply removing impurities using an ion exchange chelating resin; B. preparation of battery-grade lithium hydroxide: comprising composite electrodialysis treatment, evaporative concentration crystallization, cooling crystallization, and solid-liquid separation; C. preparation of a high-purity-grade lithium hydroxide: subjecting the battery-grade lithium hydroxide obtained from step B to dissolution, filtration, cooling crystallization, solid-liquid separation, and a post-treatment; D. preparation of high-purity-grade lithium carbonate: subjecting the high-purity-grade lithium hydroxide obtained from step C to dissolution and filtration, introducing carbon dioxide into the filtrate, performing solid-liquid separation, and subjecting same to a post-treatment; and E. preparation of battery-grade lithium carbonate: adding a battery-grade lithium carbonate seed crystal into a substrate, introducing carbon dioxide and a lithium hydroxide solution resulting from the mother liquors obtained in steps B and D for reaction, followed by aging, solid-liquid separation and a post-treatment. Also provided is a system for implementing the method. The method proposes a differentiated physicochemical treatment method according to the difference of impurities in different lithium sources, is adapted to the needs of lithium source quality changes, has a wide adaptability, and has recycled by-products, thus being economical and environmentally friendly.

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Inventors:

DAI YIHUA (CN)
CAI RONGFU (CN)
BAN WENJUN (CN)
YANG CHUNHUI (CN)
WANG XINGLONG (CN)
LI YUNFENG (CN)
LI YALI (CN)
ZHENG CHUANYONG (CN)
MENG QIANG (CN)
JIANG HONGJUN (CN)

Application Number:

PCT/CN2019/087170

Publication Date:

July 23, 2020

Filing Date:

May 16, 2019

Export Citation:

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Assignee:

CHENGDU CHEMPHYS CHEMICAL IND CO LTD (CN)
SINOLITHIUM MAT LIMITED (CN)

International Classes:

C01D15/02; C01D15/08; C25B9/23

Foreign References:

CN109650414A	2019-04-19
CN107298450A	2017-10-27
CN106315625A	2017-01-11
CN108341420A	2018-07-31
JP2011032151A	2011-02-17
US9034294B1	2015-05-19

Other References: