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Method for selectively separating lithium from leaching solution of cathode material for waste lithium-ion batteries

A technology for lithium-ion batteries and positive electrode materials, which is applied in the field of regeneration of useful parts of waste batteries, can solve the problems of low recovery rate, unstable properties of lithium-ion sieve adsorbent, and weak selectivity, and achieve low solubility and high precipitation rate. The effect of high and low cost of use

Active Publication Date: 2019-03-08
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
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Problems solved by technology

[0009] Aiming at the problems that the recovery rate is not high, the selectivity is not strong, and the properties of the lithium ion sieve adsorbent are unstable when recovering lithium from the leach solution of the positive electrode material of the waste lithium ion battery in the existing method, the present invention provides a A method for selectively separating lithium from the leaching solution of positive electrode materials. This method uses a crown ether compound that has a selective recognition effect on lithium ions as an adsorbent, dissolves it in a certain organic solvent to extract lithium ions, and realizes the selective separation of lithium ions. It can extract lithium ions from complex solutions containing cobalt, nickel, manganese, iron and other metal ions, with high recovery rate and strong selectivity, and the extracted organic phase can be reused after stripping

Method used

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  • Method for selectively separating lithium from leaching solution of cathode material for waste lithium-ion batteries

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Embodiment 1

[0037] The sulfuric acid leaching solution of the positive electrode material of the waste lithium-ion battery is used as the raw material, the pH value is 6, and the composition is Li 0.5g / L, Co 4.2g / L. A certain amount of benzo15-crown-5 was dissolved in sulfonated kerosene to prepare an extracted organic phase with a mass fraction of crown ether of 10%. A single extraction was performed at a temperature of 80°C and a phase ratio of 2:1, and the extraction time was 10 minutes. After the organic phase was separated from the aqueous phase, the temperature was 25°C, and the volume ratio of the saturated sodium carbonate solution to the organic phase was 2:1, and the volume ratio of the saturated sodium carbonate solution to the organic phase was back-extracted for 10 minutes to obtain a white lithium carbonate precipitate, and the recovery rate of lithium reached 95.3%. Such as figure 2 Shown is the XRD spectrum of gained lithium carbonate, as can be seen from the figure, whe...

Embodiment 2

[0039] The hydrochloric acid leaching solution of the positive electrode material of the waste lithium ion battery is used as the raw material, the hydrogen ion concentration is 6mol / L, and the composition is Li 8.3g / L, Co 22.5g / L, Ni 23.8g / L, Mn 21.3g / L. A certain amount of 4-aminobenzo15-crown-5 was dissolved in sulfonated kerosene to prepare an extracted organic phase with a crown ether mass fraction of 30%. At a temperature of 25°C and a ratio of 1:5, a 10-stage cross-flow extraction was carried out, and the extraction time was 60 minutes. After the organic phase was separated from the aqueous phase, the temperature was 95°C, and the volume ratio of the saturated sodium carbonate solution to the organic phase was 2:1, and the volume ratio of the saturated sodium carbonate solution to the organic phase was back-extracted for 60 minutes to obtain a white lithium carbonate precipitate, and the recovery rate of lithium reached 98.1%.

Embodiment 3

[0041] The sulfuric acid leaching solution of the positive electrode material of the waste lithium-ion battery is used as the raw material, the pH value is 1, the composition is Li 5.3g / L, and Mn 80g / L. A certain amount of 4-hydroxybenzo15-crown-5 was dissolved in dichloromethane to prepare an extracted organic phase with a mass fraction of crown ether of 15%. At a temperature of 30°C, a 10-stage countercurrent extraction was carried out under the condition of ratio 2:1, and the extraction time was 45 minutes. After the organic phase was separated from the aqueous phase, the temperature was 25°C, and the volume ratio of the saturated sodium carbonate solution to the organic phase was 1:2, and the volume ratio of the saturated sodium carbonate solution to the organic phase was back-extracted for 50 minutes to obtain a white lithium carbonate precipitate, and the recovery rate of lithium reached 96.6%.

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Abstract

The invention discloses a method for selectively separating lithium from a leaching solution of a cathode material for waste lithium-ion batteries, and belongs to the field of regeneration of useful components of waste batteries. A crown ether compound which has the selective recognition action to lithium-ion is adopted as an adsorbent to dissolve in a certain organic solvent to extract the lithium-ion, and selective separation of the lithium-ion is realized; the lithium-ion can be separated from cobalt, nickel and manganese, steel and other organic solvent, the recovery ratio is high, the selectivity is high, and the extraction organic phase can be reused after stripping.

Description

technical field [0001] The invention belongs to the field of regeneration of useful parts of waste storage batteries, and in particular relates to a method for selectively separating lithium from leachate of positive electrode materials of waste lithium ion batteries. Background technique [0002] Lithium-ion batteries are widely used in mobile phones, notebook computers, portable tools and other fields due to their many advantages such as high energy density, long cycle life, low self-discharge rate, good safety and no memory effect. Since the commercialization of lithium-ion batteries in the 1990s, a large number of waste lithium-ion batteries have been produced so far, and with the rapid development of electric vehicles in recent years, my country will usher in a large-scale power lithium-ion battery after 2020 Scale obsolescence cycle. The positive electrode materials of waste lithium-ion batteries contain lithium, cobalt, nickel, manganese, iron and other valuable metal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B26/12
CPCC22B7/007C22B26/12Y02P10/20
Inventor 姚永林朱美英童碧海赵卓樊友奇
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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