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A method and equipment for decommissioning negative electrode sheets of decommissioned batteries and graphite deep impurity removal

A battery negative electrode, deep impurity removal technology, applied in separation methods, chemical instruments and methods, battery recycling, etc., to save subsequent environmental protection treatment costs, improve the degree of greening, and have obvious social benefits.

Active Publication Date: 2021-12-21
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned patents have certain characteristics in their respective recycling technologies, but they have not dealt with the operation continuity and material recycling system engineering in terms of stripping and subsequent deep removal of active materials. The large-scale treatment of waste power battery recycling in the future will be an important topic

Method used

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  • A method and equipment for decommissioning negative electrode sheets of decommissioned batteries and graphite deep impurity removal
  • A method and equipment for decommissioning negative electrode sheets of decommissioned batteries and graphite deep impurity removal
  • A method and equipment for decommissioning negative electrode sheets of decommissioned batteries and graphite deep impurity removal

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Disassemble the decommissioned power battery after it is fully discharged. The obtained negative electrode is placed in a stripping kettle for stripping. The nozzle angle is set at 30° to pre-spray the added materials. The solid-to-liquid ratio is 1:6. The showering time is 30s, then start the mechanical stirring device, keep the rotating speed at 60r / min, and the stirring time is 45s. After stirring and stripping, lift the hanging basket in the kettle, and recover the metal foil current collector from the hanging basket on the top of the kettle connected to the filter, and the active components pass through. The pipeline at the bottom of the kettle enters the impurity removal kettle; open the valves of the acid storage tank and the water storage tank on the top of the impurity removal kettle, and configure the acid removal liquid with a concentration of 0.3mol / L. The ratio of solid material to acid solid to liquid is 1:6. The active components of the negative electrode ...

Embodiment 2

[0028] Disassemble the decommissioned power battery after it is fully discharged. The obtained negative electrode is placed in a stripping kettle for stripping. The nozzle angle is set at 45° to pre-spray the added materials. The solid-to-liquid ratio is 1:6. Spray before stirring. The showering time is 30s, then start the mechanical stirring device, keep the rotating speed at 80r / min, and the stirring time is 30s. After stirring and stripping, lift the hanging basket in the kettle, and recover the metal foil current collector from the hanging basket on the top of the kettle connected to the filter. The pipeline at the bottom of the kettle naturally flows into the impurity removal kettle by gravity; open the valves of the acid storage tank and water storage tank on the top of the impurity removal kettle, and configure the acid removal solution with a concentration of 0.5mol / L, and the solid-to-acid-solid-liquid ratio is 1:6 , heating and stirring the negative electrode active c...

Embodiment 3

[0030]Disassemble the decommissioned power battery after it is fully discharged. The obtained negative electrode is placed in a stripping kettle for stripping. The nozzle angle is set at 45° to pre-spray the added materials. The solid-to-liquid ratio is 1:6. Spray before stirring. The showering time is 30s, then start the mechanical stirring device, keep the rotating speed at 80r / min, and the stirring time is 30s. After stirring and stripping, lift the hanging basket in the kettle, and recover the metal foil current collector from the hanging basket on the top of the kettle connected to the filter, and the active components pass through. The equipment pipeline enters the impurity removal kettle; open the valves of the acid storage tank and the water storage tank on the top of the impurity removal kettle, configure the acid removal liquid with a concentration of 0.5mol / L, and the ratio of solid material to acid solid to liquid is 1:8. Next, heat and stir the active components of...

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Abstract

The invention relates to the field of battery recycling, and discloses a method and equipment for peeling off negative electrode sheets of decommissioned batteries and deeply removing impurities from graphite. In this method, the negative electrode sheet of the decommissioned battery is removed and added to the stripping kettle. First, it is pre-rinsed and infiltrated by the spray device, and then the stirring system is started to stir and strip; The metal current collector, the active material is filtered to the bottom of the stripping tank, and filtered through the second-stage filter at the bottom, and the stripped negative electrode powder obtained enters the impurity removal kettle; Deep impurity removal, in which, the impurity removal waste liquid flows out through the bottom discharge pipe, and circulates into the spray pipeline of the stripping kettle through the electromagnetic pump for circulation. After the impurity removal, the graphite powder is transported in the solid pipeline at the bottom of the stripping kettle through the screw rod. The equipment system of the invention has high integration degree, low process energy consumption, and the recycling process is green and efficient.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and regeneration, and relates to recycling of battery materials. The resource utilization of waste battery negative electrode materials is realized through peeling and recycling of metal foils of negative electrodes and deep removal and recovery of active powder graphite. Background technique [0002] The current energy and environmental problems are becoming more and more prominent, and the development of new energy has become a major trend of energy strategy. As the number of new energy vehicles increases year by year, the amount of decommissioned power batteries that have reached the limit of their life will increase significantly. It is estimated that by 2025, the amount of decommissioned power batteries in China will exceed 350,000 tons. The market for decommissioned power batteries is very important great potential. [0003] At present, the recycling of lithium-ion batterie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/225C01B32/215B01D35/02H01M10/54
CPCC01B32/225C01B32/215H01M10/54B01D35/02Y02W30/84
Inventor 张锁江张海涛达昊然张家赫
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI