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Method for producing battery-grade lithium hydroxide by utilizing battery-grade lithium carbonate lithium-depositing mother liquid

A lithium precipitation mother liquor, lithium hydroxide technology, applied in the direction of lithium oxide;/hydroxide, etc., can solve the problems of complex technology, large steam consumption, large evaporation, etc., to achieve simple and practical process, high resource utilization rate , the effect of low production cost

Inactive Publication Date: 2018-05-04
GANFENG LITHIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This treatment method also consumes a lot of steam, and the part returning to the mine leaching lithium system will increase the loss of lithium due to the circulation route.
[0008] Invention patent (ZL201110122564.9) discloses a treatment method for battery-grade lithium carbonate mother liquor, which uses steps such as acidification of lithium carbonate mother liquor, evaporation and concentration, sodium analysis, lithium precipitation, and recycling to recover battery-grade lithium carbonate mother liquor to prepare battery-grade carbonic acid Lithium, this process has a large amount of evaporation, high evaporation energy consumption, and the recovery rate of lithium precipitation is not high
The process technology is complicated, the comprehensive recovery rate of lithium is not high, and the treatment cost is also high
[0010] This patent aims at the problem of battery-grade lithium carbonate lithium precipitation mother liquor treatment and the high production cost of battery-grade lithium hydroxide, and develops the battery-grade lithium carbonate lithium precipitation mother liquor to prepare battery-grade lithium hydroxide technology

Method used

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  • Method for producing battery-grade lithium hydroxide by utilizing battery-grade lithium carbonate lithium-depositing mother liquid
  • Method for producing battery-grade lithium hydroxide by utilizing battery-grade lithium carbonate lithium-depositing mother liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A, precision filtration: 10m 3 The battery-grade lithium carbonate lithium precipitation mother liquor is passed through a 1um precision filter to remove insoluble matter and obtain 10m 3 precision filter fluid;

[0035] B, sulfuric acid acidification: add the H of 98% (wt%) in the precision filtrate in step A 2 SO 4 35Kg, adjust the pH of the solution to 1, stir the reaction for 0.5h, and then pump the solution into the acid stripping tower (Hangzhou Jietian Environmental Protection Technology Co., Ltd., model JT-007) for deep CO removal 3 2- Ions, stripping temperature 60-100°C, operating pressure 0.1Mpa, stripping tower gas velocity 1.3m / s, to obtain acidified liquid;

[0036] C. Chelating resin to remove calcium and magnesium: pass the acidified solution obtained in step B through a chelating resin tower (Xi'an Lanxiao Technology New Materials Co., Ltd., model LSC-300) to remove Ca in the solution 2+ , Mg 2+ , the velocity of the control solution is 50m 3 / h,...

Embodiment 2

[0043] A, precision filtration: 10m 3 The battery-grade lithium carbonate lithium precipitation mother liquor is passed through a 2um precision filter to remove insoluble matter and obtain 10m 3 precision filter fluid;

[0044] B, sulfuric acid acidification: add the H of 60% (wt%) in the precision filtrate in step A 2 SO 4 54Kg, adjust the pH of the solution to 2, stir the reaction for 3 hours, and then pump the solution into the acid stripping tower (Hangzhou Jietian Environmental Protection Technology Co., Ltd., model JT-007) for deep removal of CO 3 2- Ions, stripping temperature 60-100°C, operating pressure 0.1Mpa, stripping tower gas velocity 1.3m / s, to obtain acidified liquid;

[0045] C. Chelating resin to remove calcium and magnesium: pass the acidified solution obtained in step B through a chelating resin tower (Xi'an Lanxiao Technology New Materials Co., Ltd., model LSC-300) to remove Ca in the solution 2+ , Mg 2+ , the velocity of the control solution is 120...

Embodiment 3

[0052] A, precision filtration: 10m 3 The battery-grade lithium carbonate lithium precipitation mother liquor is passed through a 3um precision filter to remove insoluble matter and obtain 10m 3 precision filter fluid;

[0053] B, sulfuric acid acidification: add the H of 98% (wt%) in the precision filtrate in step A 2 SO 4 33Kg, adjust the pH of the solution to 3, stir the reaction for 2 hours, and then pump the solution into the acid stripping tower (Hangzhou Jietian Environmental Protection Technology Co., Ltd., model JT-007) for deep CO removal 3 2- Ions, stripping temperature 60-100°C, operating pressure 0.1Mpa, stripping tower gas velocity 1.3m / s, to obtain acidified liquid;

[0054] C. Chelating resin to remove calcium and magnesium: pass the acidified solution obtained in step B through a chelating resin tower (Xi'an Lanxiao Technology New Materials Co., Ltd., model LSC-300) to remove Ca in the solution 2+ , Mg 2+ , the velocity of the control solution is 120m ...

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Abstract

The invention discloses a method for producing battery-grade lithium hydroxide by utilizing battery-grade lithium carbonate lithium-depositing mother liquid. The method comprises the following steps:(1) accurately filtering the lithium-depositing mother liquid to remove undissolved substances; (2) adding sulfuric acid into the solution and removing carbonate radical through a stripping tower; (3)enabling the solution to flow through a chelate resin system to remove calcium and magnesium; (4) adding NaOH into the solution and transforming Li2SO4 into LiOH; (5) performing evaporation and concentration on the solution until the crystal slurry is 10 to 40 percent and performing centrifugal separation to obtain LiOH concentrated liquid; (6) cooling the LiOH concentrated liquid to 10 to 5 DEGC and separating out sodium to obtain LiOH purified liquid; (7) performing evaporation and concentration on the LiOH purified liquid and performing centrifugal separation to obtain a LiOH crystal; (8)recrystallizing the LiOH crystal to obtain the battery-grade lithium hydroxide. By the method, the battery-grade lithium hydroxide can be produced by circularly recovering the lithium-depositing mother liquid, the recovery rate of the lithium is increased and the production cost is reduced.

Description

technical field [0001] The invention relates to a production method of lithium salts, in particular to a method for producing battery-grade lithium hydroxide by using battery-grade lithium carbonate lithium precipitation mother liquor. Background technique [0002] Lithium carbonate and lithium hydroxide are the basic materials of the lithium salt industry. They have a variety of industrial uses. They can not only be used directly, but also can be used as raw materials to prepare various lithium salts and their compounds with high added value. Widely used in battery industry, ceramic industry, glass industry, aluminum industry, lubricant, refrigerant, nuclear industry and optoelectronic industry and other emerging application fields. Battery-grade lithium carbonate and battery-grade lithium hydroxide are mainly used in the production of lithium cobaltate, lithium iron phosphate, lithium nickelate, lithium manganate, ternary materials, nickel-cobalt lithium manganate and othe...

Claims

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Application Information

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IPC IPC(8): C01D15/02
CPCC01D15/02C01P2006/80C22B26/12
Inventor 李良彬王彬符龙傅利华陈超郁兴国黄小强李忠朱志全彭爱平李芳芳
Owner GANFENG LITHIUM CO LTD
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