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Method for recovering lithium from waste lithium battery positive electrode material and application

A technology for waste lithium batteries and positive electrode materials, which is applied in the field of comprehensive recycling of waste lithium battery resources, can solve the problems of low recovery rate and purity, inability to selectively recycle, high management and operation costs, and achieve low process energy consumption, avoid loss, The effect of reducing equipment investment

Active Publication Date: 2021-02-12
BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first purpose of the present invention is to provide a method for recovering lithium from waste lithium battery positive electrode materials, so as to solve the existing problems in the prior art, such as high energy consumption, high management and operation costs, inability to selectively recover, relatively complicated technical routes, and problems in recycling. Technical problems of low yield and purity

Method used

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Examples

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Effect test

Embodiment 1

[0068] This embodiment provides a method for recovering lithium from waste lithium battery cathode materials, which specifically includes the following steps:

[0069] (1) Take 100g of waste lithium battery cathode material powder, add 500mL of sodium sulfide solution with a mass concentration of 30%, the leaching temperature is 30°C, the pH value of the leaching system is 8-9, and the leaching time is 4h. Lithium solution and leach residue.

[0070] (2) Add a saturated sodium carbonate solution to the lithium-containing solution obtained in step (1), stir to form a precipitate, and then filter to obtain the precipitate lithium carbonate. Lithium carbonate was washed with deionized water and then dried to collect lithium carbonate.

Embodiment 2

[0072] This embodiment provides a method for recovering lithium from waste lithium battery cathode materials, which specifically includes the following steps:

[0073] (1) Take 100g of waste lithium battery cathode material powder, add 500mL of potassium sulfide solution with a mass concentration of 40%, the leaching temperature is 30°C, the pH value of the leaching system is 5-7, and the leaching time is 4h. Lithium solution and leach residue.

[0074] (2) Add a saturated sodium carbonate solution to the lithium-containing solution obtained in step (1), stir to form a precipitate, and then filter to obtain the precipitate lithium carbonate. Lithium carbonate was washed with deionized water and then dried to collect lithium carbonate.

Embodiment 3

[0076] This embodiment provides a method for recovering lithium from waste lithium battery cathode materials, which specifically includes the following steps:

[0077](1) Take 100g of waste lithium battery cathode material powder, add 400mL of ammonium sulfide solution with a mass concentration of 20%, the leaching temperature is 50°C, the pH value of the leaching system is 5-7, and the leaching time is 4h. Lithium solution and leach residue.

[0078] (2) Add a saturated sodium carbonate solution to the lithium-containing solution obtained in step (1), stir to form a precipitate, and then filter to obtain the precipitate lithium carbonate. Lithium carbonate was washed with deionized water and then dried to collect lithium carbonate.

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Abstract

The invention provides a method for recovering lithium from a positive electrode material of a waste lithium battery and application, and relates to the technical field of comprehensive recovery of waste lithium battery resources. The method for recovering lithium from the waste lithium battery positive electrode material comprises the steps that the waste lithium battery positive electrode material is leached and separated in a soluble sulfide solution to obtain a lithium-containing solution, the pH of a leaching system is 5-10, the leaching temperature is 20-100 DEG C, the leaching time is 1-6h, and the ratio of the volume of the soluble sulfide solution to the mass of the positive electrode material of the waste lithium battery is 1-20mL / g; and a precipitant is added into the lithium-containing solution to recover the lithium-containing precipitate. According to the method for recovering lithium from the waste lithium battery positive electrode material, the technical problems thatin the prior art, energy consumption is high, management and operation cost is high, selective recycling cannot be achieved, the technical route is relatively complex, and the recycling rate and purity are not high are solved, the loss of valuable metal is avoided, and the harm of waste lithium batteries to the environment is reduced.

Description

technical field [0001] The invention relates to the technical field of comprehensive recovery of waste lithium battery resources, in particular to a method and application for recovering lithium from waste lithium battery positive electrode materials. Background technique [0002] At present, the lithium recovery methods in the positive electrode materials of waste lithium batteries include fire recovery and wet recovery. When recycling lithium-ion battery cathode materials by the fire method, a reducing agent is added, mixed evenly, and roasted at high temperature. The technological process is relatively simple, but the energy consumption is high, the management and operation costs are high, and the selective recovery of valuable metals cannot be realized. The recovery rate and purity are not high, and the energy consumption is large, which is easy to cause secondary pollution to the environment. [0003] Wet recovery is to pretreat the waste battery, and then use organic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 李达蒋训雄汪胜东赵峰冯林永蒋伟张登高孙旭东
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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