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Method for extracting lithium from waste battery cathode material recovery dilute solution

A cathode material and waste battery technology, which is applied in the field of lithium extraction from waste battery cathode material recovery dilute solution, can solve the problems of low recovery rate of carbonate precipitation, irreparable environment, waste of resources, etc., and achieves low cost and improved recovery. rate, the effect of improving the reactivity

Active Publication Date: 2020-09-22
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large solubility product of lithium carbonate, the recovery rate of carbonate lithium precipitation is low, and the lithium content in the waste liquid after saturated sodium carbonate lithium precipitation is still very high. If it is directly treated as waste water, it will not only cause The waste of resources will also cause irreparable damage to the environment

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  • Method for extracting lithium from waste battery cathode material recovery dilute solution

Examples

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Effect test

Embodiment 1

[0056] Add phosphoric acid to the lithium-containing dilute solution (2g / L) obtained after acid dissolution, extraction and separation of metal ions (nickel, cobalt, manganese), and dropwise add 2mol / L sodium hydroxide solution to adjust the pH to 10, filter 1. Washing with water to obtain lithium phosphate precipitation, the solution is directly treated as waste water. Precipitate the obtained lithium phosphate, add deionized water (the mass ratio of lithium phosphate to deionized water is 2:1) and perform ball milling for 2 hours to prepare a slurry. The obtained slurry was dissolved in the pretreated resin, aged for 8 hours at a temperature of 50°C, and filtered to obtain the ion-exchanged resin and phosphoric acid solution, wherein the phosphoric acid solution can be reused. The filtered ion-exchanged resin was regenerated with 4 mol / L sulfuric acid solution, and the aging time was 6 hours. Filtration yielded a resin and a lithium-rich solution. The obtained resin can be...

Embodiment 2

[0059] Add phosphoric acid to the lithium-containing dilute solution (2g / L) obtained after acid dissolution, extraction and separation of metal ions (nickel, cobalt, manganese), and dropwise add 3mol / L sodium hydroxide solution to adjust the pH to 12, filter 1. Washing with water to obtain lithium phosphate precipitation, the solution is directly treated as waste water. Precipitate the obtained lithium phosphate, add deionized water (the mass ratio of lithium phosphate to deionized water is 2:1.5) and perform ball milling for 4 hours to prepare a slurry. The obtained slurry was dissolved in the pretreated resin, aged for 8 hours at a temperature of 60°C, and filtered to obtain the ion-exchanged resin and phosphoric acid solution, wherein the phosphoric acid solution can be reused. The filtered ion-exchanged resin was regenerated with 4 mol / L sulfuric acid solution, and the aging time was 8 hours. Filtration yielded a resin and a lithium-rich solution. The obtained resin can ...

Embodiment 3

[0062] Add phosphoric acid to the lithium-containing dilute solution (2g / L) obtained after acid dissolution and extraction to separate metal ions (nickel, cobalt, manganese), and dropwise add 2mol / L ammonia solution to adjust the pH to 10, filter and wash with water Lithium phosphate is precipitated, and the solution is directly treated as waste water. Precipitate the obtained lithium phosphate, add deionized water (the mass ratio of lithium phosphate to deionized water is 3:1) and perform ball milling for 4 hours to prepare a slurry. The obtained slurry was dissolved in the pretreated resin, aged for 6 hours at a temperature of 55°C, and filtered to obtain the ion-exchanged resin and phosphoric acid solution, wherein the phosphoric acid solution can be reused. The filtered ion-exchanged resin was regenerated with 8 mol / L nitric acid solution, and the aging time was 4 hours. Filtration yielded a resin and a lithium-rich solution. The obtained resin can be reused, the obtaine...

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Abstract

The invention provides a method for extracting lithium from a waste battery positive electrode material recovery dilute solution. The method comprises the following steps of recovering lithium ion precipitation in the dilute solution from a lithium-containing positive electrode material to obtain lithium salt precipitation, preparing the lithium salt precipitate into lithium salt slurry, carryingout ion exchange with strong acid type cation exchange resin, then replacing lithium ions in the resin subjected to ion exchange into a lithium-containing solution, and finally precipitating the lithium ions in the lithium-containing solution to obtain the lithium salt. The method is advantaged in that the phosphoric acid solution obtained by exchanging the lithium phosphate slurry with the resincan be continuously used as a raw material, the exchanged resin is regenerated by strong acid to obtain recyclable regenerated resin and a lithium-rich solution, and a lithium carbonate product with awider application range is further obtained, the solution for preparing the lithium salt can continuously return to the system to continuously extract lithium, therefore, the whole process forms a closed-loop lithium dilute solution treatment system which is pollution-free, low in energy consumption, low in cost and high in lithium recovery rate.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a method for extracting lithium from a dilute solution for recovering waste battery anode materials. Background technique [0002] Lithium-ion batteries, as a rechargeable battery with excellent electrochemical performance, have been widely used in mobile devices (such as mobile phones, laptops), electronic devices, and electric / hybrid electric vehicles. With the continuous growth of lithium-ion battery consumption, coupled with its limited service life (about 3-5 years), there will be a large number of end-of-life waste batteries in the future. These used batteries contain a large amount of harmful substances (such as heavy metals and electrolytes), and if they are not properly disposed of, they will be directly exposed to the ecosystem, which will pose serious risks to humans and the environment. However, there are still some valuable materials in the...

Claims

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Application Information

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IPC IPC(8): H01M10/54H01M10/0525B01J39/05B01J39/20C01D15/08
CPCB01J39/20B01J39/05C01D15/08H01M10/0525H01M10/54Y02E60/10Y02W30/84
Inventor 夏永高邓龙平常凤真
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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