Method for jointly preparing electric vehicle grade lithium carbonate and lithium hydroxide monohydrate

A monohydrate lithium hydroxide, electric vehicle technology, applied in the direction of lithium oxide;/hydroxide, lithium carbonate;/acid carbonate, etc., to achieve low magnetic substance, high product yield and product quality excellent effect

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] As can be seen from Table 1, the requirements for EV-grade lithium carbonate products and EV-grade lithium hydroxide monohydrate products are higher than those for battery grade products, and the existing lithium salt production methods can only obtain battery-grade lithium salt products

Method used

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  • Method for jointly preparing electric vehicle grade lithium carbonate and lithium hydroxide monohydrate
  • Method for jointly preparing electric vehicle grade lithium carbonate and lithium hydroxide monohydrate
  • Method for jointly preparing electric vehicle grade lithium carbonate and lithium hydroxide monohydrate

Examples

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Effect test

Embodiment 1

[0110] Such as figure 1 Shown, adopt following steps to produce and obtain EV grade lithium carbonate and EV grade lithium hydroxide monohydrate:

[0111] A. Slurry treatment: After filtering the lithium sulfate slurry, add 12kg / m3 to the filtrate 3calcium 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.

[0112] 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 p...

Embodiment 2

[0129] Such as figure 1 Shown, adopt following steps to produce and obtain EV grade lithium carbonate and EV grade lithium hydroxide monohydrate:

[0130] 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.

[0131] 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 primar...

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Abstract

The invention relates to a method for jointly preparing electric vehicle grade lithium carbonate and lithium hydroxide monohydrate, and belongs to the technical field of lithium batteries. The technical problem solved by the present invention is to provide a method for jointly preparing electric vehicle grade lithium carbonate and lithium hydroxide monohydrate. This method obtains a primary concentrate and a secondary concentrate through slurry treatment, two neutralization purifications, calcium removal, demagnetization and organic matter removal, and two membrane concentrations. The secondary concentrate is refined four times to obtain EV grade lithium carbonate. The concentrated liquid is converted and refined to obtain EV grade lithium hydroxide monohydrate. The method of the present invention organically combines the process flow of EV-grade lithium carbonate and EV-grade lithium hydroxide monohydrate, which can reduce the investment in equipment for the new production line, shorten the process flow, realize the industrial production of EV-grade lithium salt products, and improve the efficiency of lithium power batteries. capacity, battery life and safety performance.

Description

technical field [0001] The invention relates to a method for jointly preparing electric vehicle-grade lithium carbonate and 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 vehicl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/08C01D15/02
CPCC01D15/08C01D15/02C01P2006/80
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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