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A method for extracting high-purity lithium carbonate or lithium hydroxide from lithium-containing phosphate waste residue

A high-purity lithium carbonate, lithium hydroxide technology, applied in lithium oxide;/hydroxide, lithium carbonate;/acid carbonate, waste collector recycling, etc., can solve the lack of value-added recycling processing technology , There are few reports on the efficient recovery of lithium, to achieve the effect of improving the utilization efficiency, realizing efficient value-added utilization, and low energy consumption

Active Publication Date: 2019-10-25
湖南永杉锂业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in order to achieve the purpose of resource recycling, domestic and foreign countries have also paid more attention to the process technology of recovering valuable metals from waste lithium-ion batteries, but a large number of research and production technology work mainly revolves around the recovery of Co, Ni and other metals. However, there are few reports on technical research on efficient lithium recovery
Especially when dismantling and cleaning waste batteries, a large amount of waste electrolyte enters the cleaning water and undergoes hydrolysis, resulting in waste residue containing a large amount of transition metal phosphate, lithium phosphate, binder, conductive agent, etc., which still lacks effective value-added Recycling Technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]Weigh 100g of lithium phosphate waste residue, grind it fully and disperse it, mix it with a hydrochloric acid solution with a concentration of 8mol / L to form a slurry with a liquid-solid ratio of 3:1, and carry out stirring and leaching treatment at room temperature. After leaching for 30 minutes, filter to obtain acid Dip. Heat the obtained pickling solution to 40°C, add dephosphorizing agent R and continue to stir at this temperature for 1 hour to fully react completely, cool to room temperature and filter to remove the phosphate radical. Add 10 mL of 2M KOH solution to the filtrate obtained after removing the phosphate group while stirring, and continue stirring for 30 minutes, then add 5 mL of 1M potassium oxalate, and obtain a purified solution after filtration. Heat the purified solution to 80°C and add 400mL of 2.8M sodium carbonate solution while stirring, continue to stir for 60 minutes, filter immediately, and wash the lithium carbonate obtained three times wi...

Embodiment 2

[0041] The operation process is the same as in Example 1, except that acetic acid is used instead of hydrochloric acid, the concentration of acetic acid solution is 4.5mol / L, the leaching liquid-solid ratio is 5:1, the leaching temperature is 55°C, the reaction time is 30 minutes after adding the dephosphorization agent and the reaction is complete After cooling to 5°C for filtration, add 80 g of NaOH to the purified solution to prepare lithium hydroxide monohydrate, wash the obtained lithium hydroxide with normal temperature water three times, and dry at 120°C to obtain a lithium hydroxide monohydrate sample. The content of lithium hydroxide monohydrate in the sample was 99.03%, and the phosphorus content was 1.9ppm.

Embodiment 3

[0043] The operation process is the same as in Example 1, except that sulfuric acid is used instead of hydrochloric acid, the acid solution concentration is 1mol / L, the leaching liquid-solid ratio is 8:1, the reaction temperature after adding the dephosphorization agent is 80°C, the reaction time is 5 hours and the reaction is complete Cool to -5°C and filter. The content of lithium carbonate in the obtained sample was 99.09%, and the phosphorus content was 6.6ppm.

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Abstract

The invention relates to a method for extracting high-purity lithium carbonate or lithium hydroxide from lithium phosphate-containing waste residues and belongs to the technical field of recycling oflithium ion battery materials and resources. The method for extracting the high-purity lithium carbonate or lithium hydroxide from the lithium phosphate-containing waste residues, provided by the invention, has the benefits that the emphasis is on acid leaching treatment performed on the lithium phosphate-containing waste residues, a phosphate radical is selectively removed from the lithium phosphate-containing waste residues through a phosphorus removal agent so as not to cause lithium loss, and finally, a solution after phosphorus removal is deeply purified to remove heavy metals and other impurities and then is subjected to lithium deposition, so that the high-purity lithium carbonate or the lithium hydroxide is obtained. Therefore, the purpose of the efficient value-added utilization of the lithium phosphate-containing waste residues is achieved.

Description

technical field [0001] The invention relates to a method for extracting high-purity lithium carbonate or lithium hydroxide from waste residue containing lithium phosphate; it belongs to the technical field of lithium ion battery materials and resource recycling. [0002] technical background [0003] Lithium-ion batteries are widely used in the mobile electronic communication market due to their advantages such as high specific energy, long cycle life, and no memory effect, and have also become one of the preferred power batteries for pure electric vehicles. With the rapid development of the lithium-ion battery industry, the demand for related battery materials continues to grow. When preparing electrode materials for lithium-ion batteries, whether it is the early LiCoO 2 Or the LiMn that was gradually developed in the later stage 2 o 4 、LiFePO 4 Or ternary materials, without exception, must use high-purity lithium salts as raw materials, mainly lithium carbonate or lithi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/08C01D15/02H01M10/54
CPCC01D15/02C01D15/08C01P2006/80H01M10/54Y02W30/84
Inventor 陈亚甘辉曹利涛关杰豪陈白珍石西昌
Owner 湖南永杉锂业有限公司
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