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Recycling method of lithium iron phosphate waste battery

A lithium iron phosphate battery, lithium iron phosphate technology, used in battery recycling, waste collector recycling, battery electrodes, etc., can solve the problems of electrolyte volatility and toxicity to people and the environment, and achieve comprehensive utilization and cleaning. Production, improve production efficiency, and facilitate the effect of exhaust gas treatment

Pending Publication Date: 2020-04-14
宁夏百川新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the volatility and toxicity of the electrolyte in the dismantling process are extremely harmful to people and the environment, there are still certain flaws in the current recycling process

Method used

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  • Recycling method of lithium iron phosphate waste battery
  • Recycling method of lithium iron phosphate waste battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Take 100 discarded lithium iron phosphate batteries, put them into a box-type atmosphere resistance furnace, close the inlet, feed nitrogen, and the gas flow rate is 10m 3 / h, after 60 minutes, the temperature was raised to 300°C for high-temperature calcination, and after 6 hours of heat preservation, the temperature was naturally lowered, and the waste lithium iron phosphate battery slag was taken out after the furnace temperature dropped to 60°C;

[0027] (2) The residue in the above step 1 is separated from the shell and the powder by crushing and screening, and the shell is removed to obtain lithium iron phosphate coarse powder;

[0028] (3) The lithium iron phosphate coarse powder in step 2 is separated by an air flow separation device to obtain carbon powder and lithium iron phosphate fine powder; the iron content in the lithium iron phosphate fine powder is determined by analysis 28.5%, phosphorus content 19.7%, and lithium content 3.9%, carbon content 5.8%;...

Embodiment 2

[0032] (1) Take 100 discarded lithium iron phosphate batteries, put them into a box-type atmosphere resistance furnace, close the inlet, feed nitrogen, and the gas flow rate is 15m 3 / h, after 80 minutes, the temperature was raised to 500°C for high-temperature calcination, and after 4 hours of heat preservation, the temperature was naturally lowered, and the waste lithium iron phosphate battery slag was taken out after the furnace temperature dropped to 50°C;

[0033] (2) The residue in the above step 1 is separated from the shell and the powder by crushing and screening, and the shell is removed to obtain lithium iron phosphate coarse powder;

[0034] (3) The lithium iron phosphate coarse powder in step 2 is separated by an air flow separation device to obtain carbon powder and lithium iron phosphate fine powder; the iron content in the lithium iron phosphate fine powder is determined by analysis 28.5%, phosphorus content 19.7%, and lithium content 3.9%, carbon content 5.8%;...

Embodiment 3

[0038] (1) Take 200 discarded lithium iron phosphate batteries, put them into a box-type atmosphere resistance furnace, close the inlet, feed nitrogen, and the gas flow rate is 25m 3 / h, after 90 minutes, the temperature was raised to 650°C for high-temperature calcination, and after 0.5 hours of heat preservation, the temperature was naturally lowered, and the waste lithium iron phosphate battery slag was taken out after the furnace temperature dropped to 40°C;

[0039] (2) The residue in the above step 1 is separated from the shell and the powder by crushing and screening, and the shell is removed to obtain lithium iron phosphate coarse powder;

[0040] (3) The lithium iron phosphate coarse powder in step 2 is separated by an air flow separation device to obtain carbon powder and lithium iron phosphate fine powder; by analyzing and determining iron content in lithium iron phosphate fine powder 28.5%, phosphorus content 20%, and lithium content 4%, carbon content 6%;

[0041...

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Abstract

The invention belongs to the field of resource utilization and environmental protection of waste electronic devices, and particularly relates to a recycling method of a waste lithium iron phosphate battery. The method comprises the following specific steps: high-temperature calcination, separation, burdening and grinding, and secondary calcination. According to the method, the waste lithium iron phosphate battery is subjected to high-temperature calcination in a closed environment; and the method is convenient for tail gas treatment, solves the pollution problem in the waste lithium battery disassembling process, improves the production efficiency, does not need acid, alkali and other control substances in the subsequent production process, obtains a lithium iron phosphate positive electrode material only by adding raw materials and additives for regeneration, and realizes comprehensive utilization and clean production of the waste lithium iron phosphate positive electrode material.

Description

Technical field: [0001] The invention belongs to the field of resource utilization of waste electronic devices and environmental protection, and in particular relates to a method for recycling waste lithium iron phosphate batteries. Background technique: [0002] According to GGII data, the sales of new energy vehicles in my country have increased significantly since 2012, from 12,000 to 780,000 in 2017; The output value accounted for 54%, surpassing the scale of digital lithium batteries, and becoming the largest area in the lithium battery consumption structure. According to the plan, the cumulative production and sales of new energy vehicles in my country will reach 5 million in 2020, and my country's power battery market will continue to maintain a high-speed development trend in the medium and long term. [0003] The service life of lithium batteries is limited. For traditional digital lithium batteries, the service life is about 300 times. After one year of normal use,...

Claims

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Application Information

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IPC IPC(8): C01B25/45C01B32/05H01M4/58H01M10/54
CPCC01B25/45C01B32/05H01M10/54H01M4/5825Y02W30/84Y02E60/10
Inventor 郑铁江蒋国强曹圣平陈电华蒋华锋肖春生马俊华
Owner 宁夏百川新材料有限公司
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