Method for preparing battery-grade lithium carbonate by freezing and recycling lithium precipitation concentrated mother liquor

A technology of recycling and sinking lithium mother liquor, applied in the direction of lithium carbonate;/acid carbonate, etc., can solve the problem of low lithium content, achieve the effect of improving utilization rate, reducing production cost and improving production efficiency

Active Publication Date: 2020-12-29
JIANGXI YONGXING SPECIAL STEEL NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The content of sodium and potassium in the lepidolite leaching solution is high, and the content of lithium is low. At presen

Method used

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  • Method for preparing battery-grade lithium carbonate by freezing and recycling lithium precipitation concentrated mother liquor
  • Method for preparing battery-grade lithium carbonate by freezing and recycling lithium precipitation concentrated mother liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016](1) Lepidolite is roasted and leached to obtain a leachate, and the leachate is purified, concentrated and evaporated (MVR), lithium precipitation, and filtered to obtain lithium carbonate and lithium precipitation mother liquor;

[0017](2) Lithium precipitation mother liquor is concentrated and evaporated to obtain lithium precipitation concentrated mother liquor;

[0018](3) Add the concentrated mother liquor of lithium precipitation in step (2) to the leachate in step (1) to obtain a mixed solution. The mixed solution is purified, concentrated, evaporated, frozen at 5°C to remove potassium and sodium salts, and filtered. Import ion exchange resin to remove calcium and magnesium, and obtain battery-grade lithium carbonate and lithium precipitation mother liquor after sedimentation;

[0019](4) After being processed in step (2), the mother liquor for lithium precipitation is mixed with the leachate prepared in step (1) to perform the operation of step (3), and is recycled.

[0020]Where...

Embodiment 2

[0023](1) Lepidolite is roasted and leached to obtain a leachate, and the leachate is purified, concentrated and evaporated (MVR), lithium precipitation, and filtered to obtain lithium carbonate and lithium precipitation mother liquor;

[0024](2) Lithium precipitation mother liquor is concentrated and evaporated to obtain lithium precipitation concentrated mother liquor;

[0025](3) Add the concentrated mother liquor of lithium precipitation in step (2) to the leachate in step (1) to obtain a mixed solution. The mixed solution is purified, concentrated, evaporated, and frozen at 0°C to remove potassium and sodium salts. After filtration Import ion exchange resin to remove calcium and magnesium, and obtain battery-grade lithium carbonate and lithium precipitation mother liquor after sedimentation;

[0026](4) After being processed in step (2), the mother liquor for lithium precipitation is mixed with the leachate prepared in step (1) to perform the operation of step (3), and is recycled.

[002...

Embodiment 3

[0030](1) Lepidolite is roasted and leached to obtain a leachate, and the leachate is purified, concentrated and evaporated (MVR), lithium precipitation, and filtered to obtain lithium carbonate and lithium precipitation mother liquor;

[0031](2) Lithium precipitation mother liquor is concentrated and evaporated to obtain lithium precipitation concentrated mother liquor;

[0032](3) Add the concentrated mother liquor of lithium precipitation in step (2) to the leachate in step (1) to obtain a mixed solution. The mixed solution is purified, concentrated, evaporated, frozen at 10°C to remove potassium and sodium salts, and filtered. Import ion exchange resin to remove calcium and magnesium, and obtain battery-grade lithium carbonate and lithium precipitation mother liquor after sedimentation;

[0033](4) After being processed in step (2), the mother liquor for lithium precipitation is mixed with the leachate prepared in step (1) to perform the operation of step (3), and is recycled.

[0034]Wher...

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Abstract

The invention provides a method for preparing battery-grade lithium carbonate by freezing and recycling lithium precipitation concentrated mother liquor, and belongs to the field of lithium carbonatepreparation. The method comprises the following steps: (1) roasting and leaching lepidolite to obtain leachate, and purifying, concentrating, evaporating, lithium precipitating and filtering the leachate to obtain lithium carbonate and lithium precipitation mother liquor; (2) concentrating and evaporating the lithium precipitation mother liquor to obtain lithium precipitation concentrated mother liquor; and (3) adding the lithium precipitation concentrated mother liquor in the step (2) into the leachate to obtain a mixed solution, purifying, concentrating, evaporating and freezing the mixed solution to remove potassium and sodium salts, filtering, introducing ion exchange resin to remove calcium and magnesium, precipitating to obtain battery-grade lithium carbonate and lithium precipitation mother liquor, treating the lithium precipitation mother liquor, and recycling the lithium precipitation mother liquor in the process. According to the method, the lithium precipitation mother liquor is treated and then mixed with the leachate according to a certain volume ratio, lithium precipitation is carried out after potassium and sodium are removed through freezing, and the obtained lithium precipitation mother liquor can be recycled in the production process, so that the cost is reduced, and the production efficiency can be improved.

Description

Technical field[0001]The invention relates to the field of lithium carbonate preparation, in particular to a method for preparing battery-grade lithium carbonate by refrigerating and recycling a concentrated mother liquor of lithium precipitation.Background technique[0002]As energy issues become increasingly prominent, the research and development and industrialization of new energy materials such as lithium-ion batteries are booming. my country has a large number of lepidolite mineral resources, and the extraction of lithium, rubidium, cesium and other metals from lepidolite raw materials has good development prospects. However, the lithium content in the lepidolite raw material is about 1.7%, while the potassium and sodium content is as high as 6.5% and 1.25%. Due to the extremely high solubility of potassium and sodium salts in water, these impurities will reduce the quality of lithium carbonate products on the one hand, and on the other This will reduce production efficiency and...

Claims

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Application Information

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IPC IPC(8): C01D15/08
CPCC01D15/08C01P2006/80
Inventor 刘华峰杨鸿超刘珊珊漆小峰
Owner JIANGXI YONGXING SPECIAL STEEL NEW ENERGY TECH CO LTD
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