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Method for preparing battery grade lithium hydroxide monohydrate

A technology of monohydrate lithium hydroxide and lithium hydroxide, applied in the direction of lithium oxide;/hydroxide, etc., can solve the problem of cumbersome process, etc., and achieve the effect of rich sources, improved electrolysis current efficiency, and fewer types

Inactive Publication Date: 2019-11-08
JIANGXI RUIDA NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is low in cost, environmentally friendly and fast, the process is relatively cumbersome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) The purity of crude lithium carbonate is calculated as 90%. Weigh 840g of crude lithium carbonate and add 1L of deionized water to stir. Slowly add 1030g of sulfuric acid with an excess coefficient of about 1.05 into the crude lithium carbonate slurry;

[0046] (2) After metathesis, the solution is filtered with NaOH and sodium carbonate solution to adjust the pH to 9, and the filtrate is obtained with a nanofiltration membrane to obtain a preliminary impurity-removed liquid;

[0047] (3) After preliminary impurity removal, the liquid is deeply purified through a chelating resin column;

[0048] (4) After deep purification, the liquid is concentrated by evaporation and crystallization. The components of the concentrated liquid are: Li content 11.5g / L, Ca 2+ The content is 0.28mg / L, Mg 2+ The content is 0.36mg / L, Ni 2+ The content is 0.26mg / L, Na + 8.5g / L, SO 4 2- 97.3g / L;

[0049] (5) Pump the concentrated liquid into the ion membrane electrolysis system, and ...

Embodiment 2

[0053] (1) The purity of crude lithium carbonate is calculated as 90%. Weigh 1250g of crude lithium carbonate and add 1L of deionized water to stir. Slowly add 1540g of sulfuric acid with an excess coefficient of about 1.05 into the crude lithium carbonate slurry;

[0054] (2) After metathesis, the solution is filtered with LiOH and sodium carbonate solution to adjust the pH to 9.5, and the filtrate is obtained after preliminary removal of impurities with a nanofiltration membrane;

[0055] (3) After preliminary impurity removal, the liquid is deeply purified through a chelating resin column;

[0056] (4) After deep purification, the liquid is concentrated by evaporation and crystallization. The components of the concentrated liquid are: Li content 13.4g / L, Ca 2+ The content is 0.36mg / L, Mg 2+ The content is 0.27mg / L, Ni 2+ The content is 0.19mg / L, Na + 7.3g / L, SO 4 2- 107.5g / L;

[0057] (5) Pump the concentrated liquid into the ion membrane electrolysis system, and pump...

Embodiment 3

[0061] (1) The purity of crude lithium carbonate is 90%. Weigh 2380g of crude lithium carbonate and add 1L of deionized water to stir. Slowly add 2930g of sulfuric acid with an excess coefficient of about 1.05 into the crude lithium carbonate slurry.

[0062] (2) The solution after metathesis is adjusted to pH 9.5 with LiOH and sodium carbonate solution, and then filtered, and the filtrate is obtained after preliminary removal of impurities with a nanofiltration membrane.

[0063] (3) After preliminary impurity removal, the liquid is deeply purified through a chelating resin column.

[0064] (4) After deep purification, the liquid is concentrated by evaporation and crystallization. The components of the concentrated liquid are: Li content 14.5g / L, Ca 2+ The content is 0.41mg / L, Mg 2+ The content is 0.32mg / L, Ni 2+ The content is 0.36mg / L, Na + 9.1g / L, SO 4 2- It is 119.6g / L.

[0065] (5) Pump the concentrated liquid into the ion membrane electrolysis system, and pump Li ...

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Abstract

The invention provides a method for preparing battery grade lithium hydroxide monohydrate. The method utilizes crude lithium carbonate as a raw material, and includes the following steps: acid dissolution, preliminary impurity removal, deep impurity removal, evaporation concentration, preparation of lithium hydroxide by ion-exchange membrane electrolysis, evaporation crystallization, and recrystallization. The method is rich in source of raw material and has the advantages of recycling and utilizing resources, and being less in type of contained impurities and easy to remove; chlorine gas polluting the environment is not produced and product sulfuric acid can be reused to dissolve, and consumption of raw materials is reduced; and the pH of an anolyte is controlled by controlling a circulation anolyte to increase the efficiency of current.

Description

technical field [0001] The invention relates to a technical method for preparing lithium hydroxide, in particular to a method for preparing battery-grade lithium hydroxide monohydrate using crude lithium carbonate as a raw material. Background technique [0002] Lithium hydroxide is widely used in lithium-based greases, electrolytes for alkaline storage batteries, and the like. With the requirements of new energy vehicles for battery life and power, higher requirements are put forward for the energy density and charge and discharge performance of lithium-ion batteries. High energy density materials such as NCM811, NCM622, and NCA have gradually become the mainstream of battery cathode materials in the future. At present, the synthesis of ternary positive electrodes NCM811, NCM622, NCA and some lithium iron phosphate (LFP) products mainly use lithium hydroxide as the lithium source. With the rapid development of the new energy industry, the demand gap for battery-grade lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/02
CPCC01D15/02C01P2006/80
Inventor 陈华根李森刘水发魏银伟李锋铎张冠儒蒋文青黄心荣肖培南
Owner JIANGXI RUIDA NEW ENERGY TECH CO LTD
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