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Method for comprehensive recycling waste lithium iron phosphate battery cathode material

A technology of lithium iron phosphate battery and positive electrode material, applied in battery recycling, waste collector recycling, positive electrode and other directions, can solve the problems of complex process route, increase production cost, acid can not be recycled, etc., achieve wide source, reduce Cost recovery, high leaching efficiency

Active Publication Date: 2019-11-19
贵州红星电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has a high leaching rate, it requires a large amount of lye to neutralize the excess acid in the later stage and the acid used cannot be recycled, so the process route is complicated and the production cost is increased.

Method used

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  • Method for comprehensive recycling waste lithium iron phosphate battery cathode material
  • Method for comprehensive recycling waste lithium iron phosphate battery cathode material
  • Method for comprehensive recycling waste lithium iron phosphate battery cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] (1) 100g mass fraction of 93.27% lithium iron phosphate waste was pulverized and sieved, and then 1.875mol / L ferric sulfate solution was added for stirring reaction, wherein, 500g lithium iron phosphate waste was added to every liter of ferric sulfate solution, and the reaction temperature was 25°C. The reaction time is 23min, and a solution containing metal ions such as lithium and iron is obtained;

[0066] (2) filter step (1) gained solution, obtain ferric phosphate slag and lithium, iron solution;

[0067] (3) washing the ferric phosphate slag obtained in step (2) with water to obtain crude ferric phosphate;

[0068] (4) Add 5mol / L sodium hydroxide solution to the lithium-containing and iron-containing solution gained in step (2), and feed oxygen, filter after the reaction to obtain iron hydroxide slag and lithium-containing solution;

[0069] (5) in step (4) gained iron hydroxide slag, add in 2mol / L sulfuric acid solution, the iron salt solution that obtains can b...

Embodiment 2

[0072] (1) 100g mass fraction of 93.27% lithium iron phosphate waste was pulverized and sieved, and then 1.5mol / L iron sulfate solution was added to stir the reaction, wherein, 400g lithium iron phosphate waste was added to every liter of iron sulfate solution, and the reaction temperature was 70°C. The reaction time is 40min, and a solution containing metal ions such as lithium and iron is obtained;

[0073] (2) filter step (1) gained solution, obtain ferric phosphate slag and lithium, iron solution;

[0074] (3) washing the ferric phosphate slag obtained in step (2) with water to obtain crude ferric phosphate;

[0075] (4) Add 4mol / L potassium hydroxide solution to the lithium-containing and iron-containing solution gained in step (2), and feed oxygen, filter after the reaction to obtain iron hydroxide slag and lithium-containing solution;

[0076] (5) adding in the 1.5mol / L sulfuric acid solution in the iron hydroxide slag gained in step (4), the iron salt solution obtaine...

Embodiment 3

[0079] (1) 100g mass fraction of 93.27% lithium iron phosphate waste was pulverized and sieved, and then 0.12mol / L iron sulfate solution was added to stir the reaction. Wherein, 40g lithium iron phosphate waste was added to every liter of iron sulfate solution, and the reaction temperature was 25°C. The reaction time is 30min, and a solution containing metal ions such as lithium and iron is obtained;

[0080] (2) filter step (1) gained solution, obtain ferric phosphate slag and lithium, iron solution;

[0081] (3) washing the ferric phosphate slag obtained in step (2) with water to obtain crude ferric phosphate;

[0082] (4) adding 2mol / L sodium hydroxide solution to the lithium-containing and iron-containing solution obtained in step (2), and feeding oxygen, and filtering after the reaction to obtain iron hydroxide slag and lithium-containing solution;

[0083] (5) adding in the 1mol / L sulfuric acid solution in the iron hydroxide slag gained in step (4), the iron salt soluti...

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Abstract

The invention belongs to the technical field of waste lithium battery resource recycling and particularly relates to a method for comprehensive recycling a waste lithium iron phosphate battery cathodematerial, comprising the following steps of (1) putting a pulverized and sieved waste lithium iron phosphate battery cathode material into a ferric salt solution, and performing filtration after a reaction to obtain a first filtrate and a first filter cake; (2) adding a base and an oxidizing agent to the first filtrate, and performing filtration after a reaction to obtain a second filtrate and asecond filter cake; (3) adding a lithium salt precipitant to the second filtrate, and performing filtration after a reaction to obtain a third filtrate and a coarse lithium salt, and supplementing thethird filtrate with ferric ions and then cyclically utilizing the third filtrate for the step (1). The method of the present invention uses the ferric salt as a leaching reagent, causes no pollutionand achieves high lithium leaching efficiency (>96%).

Description

technical field [0001] The invention belongs to the technical field of resource recovery of waste lithium batteries, and in particular relates to a comprehensive recovery method for positive electrode materials of waste lithium iron phosphate batteries. Background technique [0002] With the rapid development of the new energy vehicle industry, the demand for power lithium batteries will reach 125GWh by 2020, and the amount of scrap will reach 32.2GWh, about 500,000 tons; by 2023, the amount of scrap will reach 101GWh, about 1.16 million tons. According to the calculation that the installed capacity of lithium iron phosphate batteries accounts for about 1 / 3 of the total lithium batteries, my country will produce about 200,000 to 400,000 tons of waste lithium iron phosphate batteries in the next few years. If the scrapped lithium iron phosphate battery is not properly disposed of, it will cause huge pollution to the environment. Waste lithium iron phosphate batteries have si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54C01B25/37C01B25/30C01D15/08C22B26/12C22B7/00
CPCH01M10/54C01B25/375C01B25/30C01D15/08C22B7/006C22B26/12H01M2004/028Y02W30/84
Inventor 代杨许兆东曹玉欣张琦华东
Owner 贵州红星电子材料有限公司
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