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Preparation method of electric vehicle grade lithium hydroxide monohydrate

A lithium hydroxide monohydrate, electric vehicle technology, applied in the direction of lithium oxide;/hydroxide, etc., to achieve the effect of excellent product consistency, reduced material consumption, and not easy to agglomerate

Active Publication Date: 2022-01-25
TIANQI LITHIUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] It can be seen from Table 1 that the requirements for the purity, impurity content and magnetic substance content of EV grade lithium hydroxide monohydrate products are higher than those of battery grade, and the existing industrial production methods can only obtain battery grade products

Method used

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  • Preparation method of electric vehicle grade lithium hydroxide monohydrate
  • Preparation method of electric vehicle grade lithium hydroxide monohydrate
  • Preparation method of electric vehicle grade lithium hydroxide monohydrate

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preparation example Construction

[0036] The method for the preparation method of electric vehicle grade lithium hydroxide monohydrate of the present invention, comprises the steps:

[0037] A. Slurry treatment: After filtering the lithium sulfate slurry, add calcium carbonate to the filtrate, and separate the solid and liquid to obtain calcium sulfate dihydrate solid and slightly acidic liquid, wherein the lithium sulfate slurry is obtained by leaching after acidification and roasting of lithium ore The leaching slurry, the pH value of the lithium sulfate slurry is 1-2, the specific gravity is 1.2-1.4, and the concentration is Li 2 The O content is calculated as 30-32g / L;

[0038] B. Twice neutralization and purification: adjust the pH of the slightly acidic liquid in step A to 6.5 to 7.5, react for 30 to 40 minutes, and filter to obtain a neutral liquid; then add sodium carbonate to the neutral liquid and adjust the pH to 11 to 7.5 12. React for 30-40 minutes, filter to obtain a primary purification solutio...

Embodiment 1

[0080] Such as figure 1 As shown, adopt the following steps to produce EV grade lithium hydroxide monohydrate:

[0081] A. Slurry treatment: After filtering the lithium sulfate slurry, add 12kg / m3 to the filtrate 3 calcium carbonate, solid-liquid separation to obtain calcium sulfate dihydrate solid and slightly acidic liquid, wherein, the lithium sulfate slurry is the leaching slurry obtained by leaching lithium ore after acidification and roasting, the pH value of the lithium sulfate slurry is 1, and the specific gravity is 1.2 , the concentration is Li 2 The O content was calculated as 30 g / L.

[0082] B. Twice neutralization and purification: adjust the pH of the slightly acidic solution in step A to 6.5, react for 30 minutes, and filter to obtain a neutral solution; then add a concentration of 300 ± 10g / L sodium carbonate solution 1.5 liters / Prepare a neutral solution, adjust the pH to 11, react for 30 minutes, and filter to obtain a primary purification solution.

[...

Embodiment 2

[0093] Such as figure 1 As shown, adopt the following steps to produce EV grade lithium hydroxide monohydrate:

[0094] A. Slurry treatment: After filtering the lithium sulfate slurry, add 16kg / m3 to the filtrate 3 calcium carbonate, solid-liquid separation to obtain calcium sulfate dihydrate solid and slightly acidic liquid, wherein, the lithium sulfate slurry is the leaching slurry obtained by leaching lithium ore after acidification and roasting, the pH value of the lithium sulfate slurry is 2, and the specific gravity is 1.4 , the concentration is Li 2 The O content was calculated as 32 g / L.

[0095] B. Twice neutralization and purification: adjust the pH of the slightly acidic solution in step A to 7.5, react for 40 minutes, filter to obtain a neutral solution; then add a concentration of 300 ± 10g / L sodium carbonate solution 2 liters / Prepare a neutral solution, adjust the pH to 12, react for 40 minutes, and filter to obtain a primary purification solution.

[0096] ...

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Abstract

The invention relates to a preparation method of electric vehicle grade lithium hydroxide monohydrate and belongs to the technical field of lithium batteries. The technical problem solved by the present invention is to provide a preparation method for electric vehicle grade lithium hydroxide monohydrate. This method obtains EV grade lithium hydroxide monohydrate through slurry treatment, two neutralization purifications, calcium removal, demagnetization and organic matter removal, concentration, conversion and refining. The method of the present invention can successfully prepare EV-grade lithium hydroxide monohydrate and realize the industrial production of EV-grade lithium hydroxide monohydrate. The entire process flow is a closed cycle, which reduces material consumption and production costs. The loss of lithium is small and the product The yield is high, the total yield is not less than 90%, there is no three waste emissions, it is environmentally friendly, and the obtained product has excellent quality. Compared with battery-grade products, it has better chemical indicators, lower magnetic substances, is less likely to agglomerate, and has Excellent product consistency lays a solid foundation for improving the capacity, battery life and safety performance of lithium power batteries.

Description

technical field [0001] The invention relates to a method for preparing electric vehicle-grade lithium hydroxide monohydrate, and belongs to the technical field of lithium batteries. Background technique [0002] Under the background of energy constraints and environmental pollution, the world will regard the development of new energy as an important measure to improve the environment and save costs. Among them, new energy vehicles (electric vehicles) have become the development direction of the future automobile industry due to their incomparable advantages such as low cost of use, easy maintenance, low manufacturing difficulty, stable driving, strong power, low carbon and environmental protection. According to the data released by the China Association of Automobile Manufacturers, from January to November 2017, the production and sales of pure electric vehicles were 526,000 and 502,000, a year-on-year increase of 56.5% and 60.9%. 34,420 vehicles, a year-on-year increase of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/02
CPCC01D15/02C01P2006/80
Inventor 涂明江李隆君夏光友邓玉松刘长春陈福怀刘卫东曹乃珍李超邓红云徐川高宜宝
Owner TIANQI LITHIUM CORP
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