Method for extracting lithium and battery-grade lithium hydroxide monohydrate

A lithium-rich, brine technology, applied in the direction of lithium oxide;/hydroxide, lithium carbonate;/acid carbonate, etc., can solve the problem of low lithium ion yield, lithium hydroxide monohydrate and lithium carbonate Low purity and other problems, to achieve the effect of improving purity, low production cost, and reducing content

Active Publication Date: 2021-01-12
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present disclosure is to overcome the problems of low purity and low yield of lithium ions of lithium hydroxide monohydrate and lithium carbonate when preparing

Method used

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  • Method for extracting lithium and battery-grade lithium hydroxide monohydrate

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specific Embodiment approach

[0044] As a specific embodiment, the method may further include: returning the second recrystallization mother liquor to step S4 to mix with the evaporative crystallization precipitate to perform the first dissolution and recrystallization treatment. In another specific embodiment, the method may further include: returning the first recrystallization mother liquor to step S3 to mix with the mixed lye to perform the evaporative crystallization treatment. The recovery rate of comprehensive lithium can be effectively improved by reusing the two times of dissolution and recrystallization mother liquor as the stock solution of the upper stage evaporation crystallization and / or dissolution crystallization.

[0045] According to the present disclosure, the temperature of evaporative crystallization treatment can be 50-100°C, and the crystallization rate is 40-200g / h; preferably, the temperature is 60-85°C, and the crystallization rate is 50-150g / h, so as to further reduce impurities i...

Embodiment 1

[0054] S1. Use the lithium-rich concentrated solution obtained from salt lake brine through aluminum salt lithium adsorbent-nanofiltration-reverse osmosis-nanofiltration-electrodialysis-resin treatment as raw material. The Li ion concentration in the lithium-rich concentrated solution is 7000ppm, and the Na ion concentration is . 4500ppm, K ion concentration is 1685ppm, Ca ion concentration is lower than 1ppm, Mg ion concentration is lower than 1ppm.

[0055] S2. Lithium-rich concentrated solution enters the raw material room in the bipolar membrane system as the original solution. The voltage of a single pair of membranes is 2V, and the membrane current density is 800A / m 2 The bipolar membrane alkali-making treatment is carried out under certain conditions, and the mixed alkali solution of lithium hydroxide, sodium hydroxide and potassium hydroxide with a total alkali molar concentration of 2.1mol / L is obtained, wherein the concentration of lithium hydroxide is 4.06%, and the ...

Embodiment 2

[0061] Prepared by the same method as in Example 1, the only difference is that in step S1, the lithium-rich concentrated solution obtained from salt lake brine through aluminum salt lithium adsorbent-nanofiltration-reverse osmosis-electrodialysis-resin treatment is used as raw material, rich The Ca ion concentration in the lithium concentrated solution is 0.7ppm, the Mg ion concentration is 0.9ppm, the Li ion concentration is 4500ppm, the Na ion concentration is 2890ppm, and the K ion concentration is 1083ppm.

[0062] In step S3, the concentration of Na ions in the mother liquor at the end point of evaporation and crystallization is 8% by weight, and the concentration of K ions is 4.5% by weight.

[0063] In step S4, the concentration of Na ions in the first recrystallization mother liquor is 3.5% by weight, and the concentration of K ions is 2% by weight.

[0064] In step S5, the Na ion concentration in the second recrystallization mother liquor is 0.25% by weight, and the ...

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Abstract

The invention relates to a lithium extraction method and battery-grade lithium hydroxide monohydrate, and the method comprises the following steps: carrying out the impurity removal and concentrationof lithium-containing brine, and obtaining a lithium-rich concentrated solution; carrying out bipolar membrane alkali making treatment on the lithium-rich concentrated solution to obtain a mixed alkali solution and a hydrochloric acid solution; carrying out evaporative crystallization treatment on the mixed alkali solution to obtain an evaporative crystallization precipitate and evaporative crystallization endpoint mother liquor; carrying out first dissolution recrystallization treatment on the evaporative crystallization precipitate to obtain a first recrystallization precipitate and first recrystallization mother liquor; and carrying out second dissolution recrystallization treatment on the first recrystallization precipitate to obtain the lithium hydroxide monohydrate and second recrystallization mother liquor; according to the method disclosed by the invention, the high-purity battery-grade lithium hydroxide monohydrate can be prepared, and the recovery rate of lithium ions is high.

Description

technical field [0001] The present disclosure relates to the field of lithium ion extraction, in particular, to a method for extracting lithium and battery-grade lithium hydroxide monohydrate. Background technique [0002] In recent years, the rapid development of the new energy industry has greatly stimulated the demand for upstream lithium resources. Battery-grade lithium hydroxide monohydrate and lithium carbonate are the main raw materials for the synthesis of lithium-ion battery ternary cathode materials and lithium iron phosphate materials, and their demand has also greatly increased. [0003] At present, the sources of lithium salt products in my country are mainly the extraction of lithium from lithium ore and the extraction of lithium from salt lake brine. The technology of extracting lithium from lithium ore has been developed for a long time and the technology is relatively mature. However, the reserves of lithium ore resources in my country are very limited, and ...

Claims

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Application Information

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IPC IPC(8): C01D15/02C01D15/08
CPCC01D15/02C01D15/08C01P2006/82C01P2006/80
Inventor 徐云玲李阳曹文玉刘祖荣杨明升
Owner BYD CO LTD
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