Method for recycling lithium chloride from waste lithium iron phosphate

A technology of lithium ferrous phosphate and lithium chloride, which is applied in the field of lithium chloride recovery, can solve the problems of unsatisfactory lithium ferrous phosphate and difficulty in ensuring product consistency, and achieve the effect of solving the problem of resource recycling and low cost

Active Publication Date: 2013-01-23
天齐锂业(江苏)有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the great variation in the quality of raw materials, it is difficult to guarantee the consistency of the product, which cannot meet the needs of industrialized large-scale production and recovery of lithium iron phosphate

Method used

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  • Method for recycling lithium chloride from waste lithium iron phosphate
  • Method for recycling lithium chloride from waste lithium iron phosphate
  • Method for recycling lithium chloride from waste lithium iron phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Embodiment 1 adopts the method of the present invention to comprehensively recycle and utilize lithium ferrous phosphate waste material

[0054] Discharge the residual power of the waste lithium ferrous phosphate power battery, disassemble the battery, take out the positive electrode sheet, and recycle the battery shell according to the classification of aluminum shell, steel shell, plastic, etc.; roast the lithium iron phosphate positive electrode sheet at 400°C for 1 hour, crush it and sieve it Separately recover the positive aluminum sheet; 100kg of lithium ferrous phosphate waste, lithium content 3.50%.

[0055] Roast lithium iron phosphate waste at 800°C for 1 hour, then add water to adjust the slurry, add 20% hydrochloric acid to adjust the pH value to 0.5, filter to obtain a mixed solution of iron phosphate, lithium phosphate, and ferric chloride; heat the mixed solution to 80°C, add Alkali adjusted the pH value to 2.0, reacted for 4 hours, filtered to obtain cru...

Embodiment 2

[0061] Embodiment 2 adopts the method of the present invention to comprehensively recycle lithium iron phosphate waste

[0062] Get 100kg of lithium ferrous phosphate waste produced in the battery production process, with a lithium content of 3.53%. Roast lithium iron phosphate waste at 600°C for 2 hours, then add water to adjust the slurry, add 30% hydrochloric acid to adjust the pH value to 0.8, filter to obtain a mixed solution of iron phosphate, lithium phosphate, and ferric chloride; heat the mixed solution to 90°C, add Adjust the pH value to 2.3 with alkali, react for 2 hours, filter to obtain crude iron phosphate, then wash with water at 60°C, and dry to obtain iron phosphate; adjust the pH value of the filtrate to 7, add 100 g of calcium chloride, and then filter to remove impurities; after removing impurities, the filtrate Lithium chloride was obtained by evaporation, concentration, crystallization, washing and drying, and 17.98kg of lithium chloride was obtained by w...

Embodiment 3

[0068] Embodiment 3 adopts the method of the present invention to comprehensively recycle lithium ferrous phosphate waste

[0069] Get 100kg of lithium iron phosphate waste produced in the production process of lithium iron phosphate, and the lithium content is 4.38%. Roast lithium iron phosphate waste at 500°C for 4 hours, then add water to adjust the slurry, add 35% hydrochloric acid to adjust the pH value to 1, filter to obtain a mixed solution of ferric phosphate, lithium phosphate, and ferric chloride; heat the mixed solution to 100°C, add Alkali adjusted the pH value to 2.5, reacted for 1 hour, filtered to obtain crude ferric phosphate, then washed with water at 80°C, and dried to obtain ferric phosphate; the filtrate was adjusted to a pH value of 6, 100g of calcium chloride was added, and then filtered to remove impurities; after removal of impurities, the filtrate Lithium chloride was obtained by evaporation, concentration, crystallization, washing and drying, and 17.3...

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Abstract

The invention relates to a method for recycling lithium chloride from waste lithium iron phosphate, belongs to the technical field of waste and old lithium ion battery recycle, and solves the technical problem that the method for recycling lithium chloride from the waste lithium iron phosphate is provided. The method comprises the following steps of: roasting the waste lithium iron phosphate for 1-4hours under the temperature of 500-800 DEG C; leaching the materials after roasting by using hydrochloric acid, wherein the pH value is controlled to be within 0.5-1 during leaching; filtering so as to obtain a mixing liquid of lithium phosphate, iron phosphate and ferric chloride; heating the obtained mixing liquid to be at 80-100 DEG C; adjusting the pH value to be 2-2.5; reacting for 1-4hours; filtering; washing; drying so as to obtain the iron phosphate; adjusting the pH value of obtained filtrate to be 6-7; adding calcium chloride to perform phosphorous removal; and filtering; evaporating, concentrating, crystallizing, washing and drying the obtained filtrate to obtain lithium chloride.

Description

technical field [0001] The invention relates to a method for recovering lithium chloride from lithium ferrous phosphate waste, and belongs to the technical field of recovery and utilization of waste lithium ion batteries. Background technique [0002] Lithium-ion battery is a green battery with a series of excellent properties. It has been widely used since it came out more than 10 years ago. Lithium iron phosphate (LiFePO 4 ) materials have become the preferred material for lithium-ion power batteries because of their high safety, high environmental protection, low price, and long life. Electric bicycles, mopeds, golf carts, airplane model toys, miner's lamps and other power battery fields. Car manufacturers are also repeatedly experimenting with lithium iron phosphate materials in starting power lithium-ion batteries (12V / 24V 50Ah). In the future, this material also has room for development in the fields of mobile communication base stations and energy storage equipment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCY02E60/12Y02W30/84
Inventor 王平熊仁利黄春莲金鹏何霞
Owner 天齐锂业(江苏)有限公司
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