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Method for recovering lithium from low-lithium-content battery waste

A technology for recovering lithium and batteries, which is applied in the field of lithium recovery, can solve the problems of low lithium recovery rate, high recovery cost, and high processing cost, so as to reduce production cost and operation requirements, avoid the use of extraction agents, and avoid alkali metal pollution Effect

Active Publication Date: 2022-07-22
广东芳源新材料集团股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of wet treatment is that the recovery rate is high, which can reach about 90%, but the treatment process is complicated and the treatment cost is relatively high
And in the wet recovery process, lithium can usually be extracted last. Generally, after extracting metal ions such as cobalt, manganese, and nickel, most of the remaining lithium elements are in the raffinate, because the lithium content in the raffinate is low at this time. (Generally 1.5~2.0g / L), making it more difficult to enrich again, the recovery cost is high by means of evaporation, concentration and crystallization, and it is often not recovered, and the tail water is discharged after treatment, causing environmental pollution and waste of resources
The fire method refers to adding the positive electrode powder to the slagging agent and then melting the slag at a high temperature above 1300°C to separate valuable metals. Although the fire method has a large amount of treatment and a simple process, the recovery rate of lithium is very low. The current industry basically no use
[0003] Therefore, in addition to the extraction method, how to separate lithium and ternary metal ions M (nickel, cobalt, manganese, aluminum, etc.) The efficient separation of ions M, further and how to realize lithium recovery from the source of battery waste and low content (generally 1.5~2.0g / L) lithium recovery related technologies and recovery devices have not yet been reported.

Method used

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  • Method for recovering lithium from low-lithium-content battery waste
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  • Method for recovering lithium from low-lithium-content battery waste

Examples

Experimental program
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Effect test

Embodiment approach 1

[0093] Lithium sulfate solution containing ternary metal ion M (nickel), nickel concentration of 120g / L, lithium concentration of 18.0g / L, lithium sulfate solution containing ternary metal ion M (nickel) together with sodium hydroxide solution and ammonia water Enter the synthesis reaction kettle, control the stirring speed to be 160 rpm, the pH value to be 12.0, and the synthesis temperature to be 60 ° C. After the reaction kettle is full, it overflows normally, and the overflowed slurry is separated from solid and liquid by a centrifuge, and the ternary metal ion M is realized. (Ni) effective separation of M and lithium in lithium sulfate solution, and detection of residual lithium in the obtained spherical nickel hydroxide and residual M content in lithium sulfate solution.

Embodiment approach 2

[0095] Lithium sulfate solution containing ternary metal ion M (nickel), nickel concentration of 120g / L, lithium concentration of 25.0g / L, lithium sulfate solution containing ternary metal ion M (nickel) together with sodium hydroxide solution and ammonia water Enter the synthesis reaction kettle, control the stirring speed to be 160 rpm, the pH value to be 12.0, and the synthesis temperature to be 60 ° C. After the reaction kettle is full, it overflows normally, and the overflowed slurry is separated from solid and liquid by a centrifuge, and the ternary metal ion M is realized. (Ni) effective separation of M and lithium in lithium sulfate solution, and detection of residual lithium in the obtained spherical nickel hydroxide and residual M content in lithium sulfate solution.

Embodiment approach 3

[0097] Lithium sulfate solution containing ternary metal ion M (cobalt), cobalt concentration of 110g / L, lithium concentration of 30.0g / L, lithium sulfate solution containing ternary metal ion M (cobalt), potassium hydroxide solution, ammonia water together Enter the synthesis reaction kettle, control the stirring speed to be 160 rpm, the pH value to be 12.0, and the synthesis temperature to be 60 ° C. After the reaction kettle is full, it overflows normally, and the overflowed slurry is separated from solid and liquid by a centrifuge, and the ternary metal ion M is realized. The effective separation of M and lithium in the lithium sulfate solution of (cobalt), and the detection of the residual lithium in the obtained spherical cobalt hydroxide and the residual M content in the lithium sulfate solution.

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Abstract

The invention provides a method for recovering lithium from low-lithium-content battery waste, most of lithium elements are in extraction raffinate of cobalt, manganese, nickel and other metal ions recovered by a wet method from the source of the battery waste, and due to the fact that the lithium content in the extraction raffinate is low (generally 1.5-2.0 g / L), low-cost recovery of lithium is achieved. And the problems of environmental pollution and resource waste caused by the fact that the recovery cost is high by adopting evaporation, concentration and crystallization means and the like on the residual lithium at present, or the residual lithium is not recovered and the tail water is directly discharged after being treated are solved.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a method for recovering lithium from battery waste with low lithium content. Background technique [0002] Lithium-ion batteries have developed rapidly in the battery market due to their special energy storage properties, but as lithium batteries are charged and discharged in cycles, they need to be recycled after their lifespan expires. At present, the general steps of recycling waste lithium-ion batteries are disassembly, screening, crushing and extraction, and the crushed cathode powder is then subjected to wet or fire processing to obtain the desired product. The advantage of wet treatment is that the recovery rate is high, up to about 90%, but the treatment process is complicated and the treatment cost is relatively large. In the wet recovery process, lithium is usually extracted last. Generally, after the extraction of cobalt, manganese, nickel and other met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B26/12C22B23/00H01M10/54C22B3/38
CPCC22B7/007C22B26/12C22B23/0453H01M10/54
Inventor 龙全安吴楚明姚心宇吴芳罗爱平
Owner 广东芳源新材料集团股份有限公司
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