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Method for preparing electric vehicle-grade lithium carbonate

An electric vehicle, lithium carbonate technology, applied in the direction of lithium carbonate;/acid carbonate, etc., to achieve the effect of low magnetic substance, reduce environmental pollution, and reduce energy consumption

Active Publication Date: 2019-11-05
TIANQI LITHIUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] As can be seen from Table 1, the purity, impurity content and magnetic substance content requirements of EV grade lithium carbonate products are all higher than those of battery grades, and the existing lithium salt production methods can only obtain battery grade lithium carbonate products in large-scale production

Method used

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  • Method for preparing electric vehicle-grade lithium carbonate
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  • Method for preparing electric vehicle-grade lithium carbonate

Examples

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preparation example Construction

[0036] The preparation method of electric vehicle grade lithium carbonate 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 solution;

[0039] C. Decalcifica...

Embodiment 1

[0082] like figure 1 Shown, adopt following steps to produce and obtain EV grade lithium carbonate:

[0083] 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.

[0084] 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.

[0085] C. De...

Embodiment 2

[0095] like figure 1 Shown, adopt following steps to produce and obtain EV grade lithium carbonate:

[0096] 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.

[0097] 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.

[0098] C. Decalcif...

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Abstract

The invention relates to a method for preparing electric vehicle-grade lithium carbonate, belongs to the technical field of lithium batteries and aims to solve the technical problem of providing the method for preparing the electric vehicle-grade (EV-grade) lithium carbonate. The method comprises the following steps: performing slurry treatment, performing two times of neutralization purification,performing calcium, magnetism and organic matter removal, performing concentration so as to obtain a concentration liquid, and performing four times of refining on the concentration liquid, so as toobtain the EV-grade lithium carbonate. By adopting the method provided by the invention, a product of excellent quality can be prepared, that is, an EV-grade product, compared with a battery-grade product, the product has excellent chemical indexes, is low in magnetic substance content and not easy to aggregate, and has excellent product consistency, and solid bases are made for increasing the capacity of lithium power batteries, prolonging the service life of a battery and improving the security performance of the battery.

Description

technical field [0001] The invention relates to a preparation method of electric vehicle-grade lithium carbonate, belonging 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 119.19% and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08
CPCC01D15/08C01P2006/80
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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