Method for recycling lithium iron phosphate batteries

A lithium iron phosphate battery, iron sulfate technology, applied in the direction of improving process efficiency, can solve problems such as high cost and large consumption of organic acids, and achieve the effects of reducing water consumption, reducing sewage discharge, and high lithium recovery rate

Active Publication Date: 2020-11-13
天齐锂业(江苏)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The core of this method is to use acidic substances to corrode lithium ferrous phosphate to form water-soluble complexes. The consumption of organic acids is relatively high and the cost is high, and the recovery rate of lithium is 97.1%, which needs to be further improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Manually disassemble the lithium iron phosphate battery, separate the positive electrode, negative electrode, diaphragm, and iron shell to obtain the battery positive electrode powder. The ferric nitrate and positive electrode powder were mixed and ball-milled, the ball-to-material ratio was 2:1, and the ball-milling time was 2 hours (30 minutes of ball milling, 30 minutes of shutdown). Wherein, the molar ratio of ferric nitrate to iron in the powder is 1:1. The mixed powder is passed through a 200-mesh sieve, and the undersize is taken. The oversize is returned to the previous step for re-ball milling; the undersize is roasted in an air atmosphere at a roasting temperature of 600°C for 2 hours. Crush the roasted product and leaching with deionized water, the ratio of solid to liquid is 1:3. Filter the mixed slurry, and the filtrate is used as the lithium sinking mother liquor. According to analysis and testing, under this condition, 99.1% of lithium can be effective...

Embodiment 2

[0059] Manually disassemble the lithium iron phosphate battery, separate the positive electrode, negative electrode, diaphragm, and iron shell to obtain the battery positive electrode powder. The ferric acetate and the positive electrode powder were mixed and ball-milled, the ball-to-material ratio was 3:2, and the ball-milling time was 2h (30min ball milling, 30min shutdown). Wherein, the molar ratio of iron acetate to iron in the powder is 1:1. The mixed powder is passed through a 200-mesh sieve, and the undersize is taken. The oversize is returned to the previous step for re-ball milling; the undersize is roasted in an air atmosphere at a roasting temperature of 550°C for 3 hours. Crush the roasted product and leaching with deionized water, the ratio of solid to liquid is 1:4. Filter the mixed slurry, and the filtrate is used as the lithium sinking mother liquor. Through analysis and testing, under this condition, the recovery rate of lithium is 99.5%.

Embodiment 3

[0061] Manually disassemble the lithium iron phosphate battery, separate the positive electrode, negative electrode, diaphragm, and iron shell to obtain the battery positive electrode powder. The ferric sulfate heptahydrate and the positive electrode powder were mixed and ball-milled, the ball-to-material ratio was 2:1, and the ball-milling time was 3 hours (30 minutes of ball milling, 30 minutes of shutdown). Wherein, the molar ratio of ferric sulfate heptahydrate to iron in the powder is 1:1. The mixed powder is passed through a 200-mesh sieve, and the undersize is taken. The oversize is returned to the previous step for re-ball milling; the undersize is roasted in an air atmosphere at a roasting temperature of 550°C for 4 hours. Crush the roasted product and leaching with deionized water, the solid-to-liquid ratio is 1:3.5. Filter the mixed slurry, and the filtrate is used as the lithium sinking mother liquor. Through analysis and testing, under this condition, the recov...

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Abstract

The invention relates to a method for recycling lithium iron phosphate batteries, and belongs to the technical field of battery recycling. The method for recycling the lithium iron phosphate batteriesconsumes less water, and comprises the following steps of a, splitting the batteries to obtain positive electrode powder; b, mixing the positive electrode powder with metal salt powder, performing ball milling, performing screening, and taking screen underflow; c, roasting the screen underflow in an oxygen-containing atmosphere, enabling the roasting temperature to range from 550 DEG C to 600 DEGC, enabling the roasting time to range from 2-4 hours, and obtaining a roasted product; and d, leaching, crushing the roasted product, leaching with water, and filtering to obtain a filtrate, namelythe lithium precipitation mother liquor. By adopting a dry ball milling technology, more waste water generated by a wet method is avoided, lithium is leached only by using water finally, the filteredwater in the step can be reused after lithium precipitation, the water consumption is low, the raw material is wide in source and low in cost, oxidizing agents such as H2O2 and O3 do not need to be added, a small amount of ferric salt and manganese salt are not needed, the lithium leaching efficiency of 99% or above can be obtained, and lithium recovery rate is high.

Description

technical field [0001] The invention relates to a method for recycling lithium iron phosphate batteries, belonging to the technical field of battery recycling. Background technique [0002] In recent years, with the rapid growth of the application of lithium-ion batteries in electric vehicles, 3C digital products and other fields, the overall production and market size of lithium-ion batteries in the world have rapidly increased. In 2015, the overall global output of lithium-ion batteries reached 100.75GWh, a year-on-year increase of 39.45%. From 2005 to 2015, the global lithium battery market size increased from US$5.6 billion to US$22.1 billion, with a compound annual growth rate of 14.7%; it is expected that the global lithium battery market will reach US$36.3 billion in 2020 and will continue to maintain a relatively high level . [0003] Focusing on lithium iron phosphate batteries, according to the calculation of the five-year retirement period of lithium iron phosph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/02C22B26/12
CPCC22B1/02C22B7/006C22B26/12Y02P10/20
Inventor 周复胡曦李超赵莉徐川肇巍臧成杰
Owner 天齐锂业(江苏)有限公司
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