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Method for recycling lithium hydrate from lithium iron phosphate waste

A technology of lithium ferrous phosphate and lithium hydroxide, which is applied in the field of lithium hydroxide recovery, can solve problems such as difficulty in ensuring product consistency and failure to meet lithium iron phosphate, and achieve the effect of solving recycling problems

Active Publication Date: 2013-01-16
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 hydrate from lithium iron phosphate waste
  • Method for recycling lithium hydrate from lithium iron phosphate waste
  • Method for recycling lithium hydrate from lithium iron phosphate waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Embodiment 1 Using the method of the present invention to comprehensively recycle lithium iron phosphate waste

[0058] 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 iron phosphate waste, lithium content 3.51%.

[0059] Roast lithium iron phosphate waste at 800°C for 1 hour, then add water to adjust the slurry, add 98% concentrated sulfuric acid to adjust the pH value to 0.5, filter to obtain a mixed solution of ferric phosphate, lithium phosphate, and ferric sulfate; heat the mixed solution to 80°C, add Alkali adjusted the pH value to 2.0, reacted for 4 hours, filtered to obtain crude ferric phosphat...

Embodiment 2

[0065] Embodiment 2 Using the method of the present invention to comprehensively recycle lithium iron phosphate waste

[0066] Get 100kg of lithium ferrous phosphate waste produced in the battery production process, with a lithium content of 3.52%. Roast lithium iron phosphate waste at 600°C for 2 hours, then add water to adjust the slurry, add 98% concentrated sulfuric acid to adjust the pH value to 0.8, filter to obtain a mixed solution of ferric phosphate, lithium phosphate, and ferric sulfate; 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 Add sodium hydroxide to adjust SO 4 2- / Na + The molar ratio is 1:1, and cooled to -5°C under stirring conditions to obtain a mixed slu...

Embodiment 3

[0072] Embodiment 3 Using the method of the present invention to comprehensively recycle lithium iron phosphate waste

[0073] Get 100kg of lithium iron phosphate waste produced in the production process of lithium iron phosphate, and the lithium content is 4.40%. Roast lithium iron phosphate waste at 500°C for 4 hours, then add water to adjust the slurry, add 98% concentrated sulfuric acid to adjust the pH value to 1, filter to obtain a mixed solution of ferric phosphate, lithium phosphate, and ferric sulfate; 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 Add sodium hydroxide to adjust SO 4 2- / Na +The molar ratio is 1.1:1, and cooled to -2°C under stir...

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Abstract

The invention relates to a method for recycling lithium hydrate from lithium iron phosphate waste, and belongs to the technical field of waste lithium ion battery recycling. The invention provides a method for recycling lithium hydrate from lithium iron phosphate waste, which comprises the following steps: the lithium iron phosphate waste is roasted for 1-4h at the temperature of 500-800 DEG C; sulfuric acid is added into the roasted material for leaching, and the mixed solution of lithium phosphate, ferric phosphate and ferric sulfate is obtained after filtration; the mixed solution is heated to 80-100 DEG C, the pH value of the mixed solution is adjusted to be 2-2.5, reaction is carried out for 1-4h, and the ferric phosphate is obtained after filtration, washing and drying; the pH value of filtrate obtained through filtration is adjusted to be 6-7, and calcium chloride is added for dephosphorization; and sodium hydroxide is added into the filtrate obtained through filtration after the dephosphorization, the molar ratio of SO42- / Na+ is adjusted to be (0.9-1.1):1, the mixture is cooled to -5+ / -3 DEG C under a stirring condition, the obtained filtrate is heated and evaporated until the liquid-solid ratio is (0.8-1.1):1, and then a lithium hydroxide crude product is obtained through cooling, crystallization and filtration.

Description

technical field [0001] The invention relates to a method for recovering lithium hydroxide 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 equipmen...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCY02E60/12Y02W30/84
Inventor 王平熊仁利黄春莲金鹏吴利苹
Owner 天齐锂业(江苏)有限公司
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