Title:
PREPARATION METHOD FOR BATTERY-GRADE LITHIUM CARBONATE
Document Type and Number:
WIPO Patent Application WO/2024/040907
Kind Code:
A1
Abstract:
The present invention relates to the technical field of battery-grade lithium carbonate, and disclosed is a preparation method for battery-grade lithium carbonate. The preparation method comprises: adding a sodium carbonate solution to a lithium-containing mother solution, and subjecting same to high-temperature lithium precipitation to obtain crude lithium carbonate; subjecting the crude lithium carbonate to a multi-stage cycle operation of hydrogenation reaction and thermal decomposition reaction: mixing the crude lithium carbonate with water to prepare a pure water slurry, introducing carbon dioxide thereto to perform a hydrogenation reaction until lithium carbonate is completely dissolved, and filtering same to obtain a lithium bicarbonate solution; heating the lithium bicarbonate solution until a precipitate is generated, and separating high-purity lithium carbonate and a lithium-containing filtrate; and returning the lithium-containing filtrate to mix same with another part of the crude lithium carbonate, and slurrying the filtrate to form a filtrate slurry, wherein the cycle number of the multi-section cycle operation is at least four. By repeatedly using the lithium-containing filtrate after the thermal decomposition reaction for slurrying, the present application greatly reduces the amount of pure water. Due to the problem of solubility of lithium carbonate, the less pure water there is, the less correspondingly dissolved lithium carbonate there is, thereby greatly improving the conversion rate of solid lithium carbonate.
Inventors:
ZHANG JINCHAO (CN)
LIU SHAOKUI (CN)
LIU YONGQI (CN)
GONG QINXUE (CN)
LI CHANGDONG (CN)
LIU SHAOKUI (CN)
LIU YONGQI (CN)
GONG QINXUE (CN)
LI CHANGDONG (CN)
Application Number:
PCT/CN2023/079085
Publication Date:
February 29, 2024
Filing Date:
March 01, 2023
Export Citation:
Assignee:
GUANGDONG BRUNP RECYCLING TECHNOLOGY CO LTD (CN)
HUNAN BRUNP RECYCLING TECH CO LTD (CN)
HUNAN BRUNP RECYCLING TECH CO LTD (CN)
International Classes:
C01D15/08
Foreign References:
| CN115286017A | 2022-11-04 | |||
| CN106365182A | 2017-02-01 | |||
| CN106315629A | 2017-01-11 | |||
| CN102583453A | 2012-07-18 | |||
| CN102398910A | 2012-04-04 | |||
| CN106517258A | 2017-03-22 | |||
| US6048507A | 2000-04-11 |
Other References:
HU MIN, GONG HANZHANG, WU HUADONG, GUO JIA, ZHANG LINFENG, ZHOU YUXI: "Preparation of battery-grade lithium carbonate from lithium-containing industrial waste", WUJIYAN-GONGYE = INORGANIC CHEMICALS INDUSTRY, TIANJIN HUAGONG YANJIUSUO, CN, vol. 52, no. 3, 1 March 2020 (2020-03-01), CN , pages 80 - 84, XP093143482, ISSN: 1006-4990, DOI: 10.11962/1006-4990.2019-0221
WEI HAOTIAN HUAN ZHANG MENGLONG TIAN YONGPAN YU JIANCHENG ZHAO : "Research Progress in Preparation and Purification of Battery-Grade Lithium Carbonate", MODERN CHEMICAL INDUSTRY, HUAXUE GONGYE BU KEXUE JISHU QINGBAO YANJIUSUO, BEIJING, CN, vol. 38, no. 8, 31 August 2018 (2018-08-31), CN , pages 33 - 37, XP009552976, ISSN: 0253-4320
ZHOU XIAO-DONG, YE HUA;GUO QING, SUN MING-CANG, CHEN WU-JIE: "Purification of Lithium Carbonate by Carbonation-Decomposition Method", NONFERROUS METALS(EXTRACTIVE METALLURGY)., no. 4, 1 December 2018 (2018-12-01), pages 42 - 45, XP093143490, DOI: 10.3969/j.issn.1007-7545.2018.04.010
YANRU LI, LIANG ZHU, YUAN ，, ZUOLIANG SHA, MEIJIE YANG, YUEHUA ZUO: "Research on purifying process of coarse lithium carbonate", INORGANIC CHEMICALS INDUSTRY., vol. 45, no. 8, 1 August 2013 (2013-08-01), pages 15 - 17, XP093143494
WEI HAOTIAN HUAN ZHANG MENGLONG TIAN YONGPAN YU JIANCHENG ZHAO : "Research Progress in Preparation and Purification of Battery-Grade Lithium Carbonate", MODERN CHEMICAL INDUSTRY, HUAXUE GONGYE BU KEXUE JISHU QINGBAO YANJIUSUO, BEIJING, CN, vol. 38, no. 8, 31 August 2018 (2018-08-31), CN , pages 33 - 37, XP009552976, ISSN: 0253-4320
ZHOU XIAO-DONG, YE HUA;GUO QING, SUN MING-CANG, CHEN WU-JIE: "Purification of Lithium Carbonate by Carbonation-Decomposition Method", NONFERROUS METALS(EXTRACTIVE METALLURGY)., no. 4, 1 December 2018 (2018-12-01), pages 42 - 45, XP093143490, DOI: 10.3969/j.issn.1007-7545.2018.04.010
YANRU LI, LIANG ZHU, YUAN ，, ZUOLIANG SHA, MEIJIE YANG, YUEHUA ZUO: "Research on purifying process of coarse lithium carbonate", INORGANIC CHEMICALS INDUSTRY., vol. 45, no. 8, 1 August 2013 (2013-08-01), pages 15 - 17, XP093143494
Attorney, Agent or Firm:
JIAQUAN IP LAW (CN)
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