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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  • Abstract
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  • 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 har

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

Example Embodiment

[0025] Example one:

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

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

[0028] (3) The coarse lithium iron phosphate powder of step 2 is separated by an airflow separator to obtain carbon powder and lithium iron phosphate refined powder; the iron content in the lithium iron phosphate refined powder is 28.5%, the phosphorus content is 19.7%, and the lithium content is determined by analysis 3.9%, carbon content 5.8%;

...

Example Embodiment

[0031] Embodiment two:

[0032] (1) Take 100 scrap lithium iron phosphate batteries, put them into a box-type atmosphere resistance furnace, seal the inlet, and let in nitrogen with a gas flow rate of 15m 3 / h, after 80min, the temperature is raised to 500℃ for high-temperature calcination, and the temperature is naturally cooled after being kept for 4 hours. After the furnace temperature drops to 50℃, the waste lithium iron phosphate battery slag is taken out;

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

[0034] (3) The coarse lithium iron phosphate powder of step 2 is separated by an airflow separator to obtain carbon powder and lithium iron phosphate refined powder; the iron content in the lithium iron phosphate refined powder is 28.5%, the phosphorus content is 19.7%, and the lithium content is determined by analysis 3.9%, carbon content 5.8%;

[0035] (4...

Example Embodiment

[0037] Embodiment three:

[0038] (1) Take 200 scrapped lithium iron phosphate batteries, put them into a box-type atmosphere resistance furnace, seal the inlet, and let in nitrogen with a gas flow of 25m 3 / h, after 90 minutes, the temperature is raised to 650°C for high-temperature calcination, and the temperature is naturally cooled after holding for 0.5 hours. After the furnace temperature drops to 40°C, the waste lithium iron phosphate battery slag is taken out;

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

[0040] (3) The coarse lithium iron phosphate powder of step 2 is separated by an airflow separator to obtain carbon powder and lithium iron phosphate refined powder; the iron content in the lithium iron phosphate refined powder is 28.5%, the phosphorus content is 20%, and the lithium content is determined by analysis 4%, carbon content 6%;

[0041] (4...

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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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