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A kind of recycling method of waste lithium iron phosphate battery

A technology of lithium iron phosphate battery and recycling method, applied in the direction of waste collector recycling, lithium carbonate;/acid carbonate, etc., can solve problems such as difficulty, complex cathode material, complicated separation and purification process, etc., and achieve high The effect of high recovery rate and purity

Active Publication Date: 2019-08-27
廖智华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing technology can realize the recovery of metals such as cobalt, nickel, manganese, lithium, iron and aluminum, but due to the complexity of the existing lithium-ion battery cathode materials, the subsequent separation and purification process becomes complicated and difficult, making the obtained The final metal product is not very pure

Method used

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  • A kind of recycling method of waste lithium iron phosphate battery

Examples

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Effect test

Embodiment 1

[0029] Example 1 Recycling method of waste lithium iron phosphate battery

[0030] (1) After dismantling the waste lithium iron phosphate battery, take the positive pole piece and wash it, and then perform high temperature treatment;

[0031] (2) Pulverize the positive pole piece after the high-temperature treatment in step (1); then place it in an organic acid solution system, and react at 95° C. for 1.5 hours to obtain a reaction solution;

[0032] (3) adding the extract to the reaction solution described in step (2) to extract, and separating the extract after the extraction;

[0033] (4) adding mineral acid solution to the extract and fully shaking, separating the mineral acid solution after shaking;

[0034] (5) add saturated sodium carbonate solution in mineral acid solution, get precipitate lithium carbonate;

[0035] The high temperature treatment described in step (1) refers to treatment at 300°C for 1.5h;

[0036] The organic acid solution system (aqueous solution...

Embodiment 2

[0044] Example 2 Recycling method of waste lithium iron phosphate battery

[0045] (1) After dismantling the waste lithium iron phosphate battery, take the positive pole piece and wash it, and then perform high temperature treatment;

[0046] (2) Pulverize the positive pole piece after the high-temperature treatment in step (1); then place it in an organic acid solution system, and react at 95° C. for 1.5 hours to obtain a reaction solution;

[0047] (3) adding the extract to the reaction solution described in step (2) to extract, and separating the extract after the extraction;

[0048] (4) adding mineral acid solution to the extract and fully shaking, separating the mineral acid solution after shaking;

[0049](5) add saturated sodium carbonate solution in mineral acid solution, get precipitate lithium carbonate;

[0050] The high temperature treatment described in step (1) refers to treatment at 300°C for 1.5h;

[0051] The organic acid solution system described in step ...

Embodiment 3

[0059] Example 3 Recovery method of waste lithium iron phosphate battery

[0060] (1) After dismantling the waste lithium iron phosphate battery, take the positive pole piece and wash it, and then perform high temperature treatment;

[0061] (2) Pulverizing the positive pole piece after the high-temperature treatment in step (1); placing it in an organic acid solution system, and reacting at 90° C. for 2 hours to obtain a reaction solution;

[0062] (3) adding the extract to the reaction solution described in step (2) to extract, and separating the extract after the extraction;

[0063] (4) adding mineral acid solution to the extract and fully shaking, separating the mineral acid solution after shaking;

[0064] (5) add saturated sodium carbonate solution in mineral acid solution, get precipitate lithium carbonate;

[0065] The high temperature treatment described in step (1) refers to treatment at 200°C for 2h;

[0066] The organic acid solution system described in step (2...

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Abstract

The invention relates to the technical field of battery recycling, in particular to a recycle method of a waste lithium iron phosphate battery. The method comprises the following steps of (1) taking a positive pole plate for washing after the waste lithium iron phosphate battery is disassembled, and performing high-temperature processing; (2) smashing the positive pole plate subjected to high-temperature processing in the step (1), placing the smashed positive pole plate in an organic acid solution system for reaction for 1-2 hours at 90-100 DEG C to obtain a reaction liquid; (3) adding an extraction liquid into the reaction liquid of the step (2) for extraction, and separating the extraction liquid after extraction is completed; (4) adding an inorganic acid solution into the extraction liquid, performing full vibration, and separating the inorganic acid solution after vibration is completed; and (5) adding a saturated sodium carbonate solution into the inorganic acid solution to obtain a precipitate lithium carbonate. The data of an embodiment shows that by the method, the recycle rate of lithium ions is larger than 99%, the purity of the obtained lithium carbonate is larger than 99.5%, and the purity thereof reaches a national standard of battery lithium carbonate.

Description

technical field [0001] The invention relates to the technical field of battery recycling, in particular to a recycling method for waste lithium iron phosphate batteries. Background technique [0002] Lithium iron phosphate battery refers to a lithium ion battery that uses lithium iron phosphate as the positive electrode material. Lithium iron phosphate has the advantages of safety, environmental protection, good stability, high specific capacity, and low price, and is widely used as a battery cathode material. [0003] But lithium-ion battery life is generally 1-3 years. According to statistics, from 2002 to 2006, the number of waste lithium-ion batteries in my country was about 200-500 tons per year. It is predicted that by 2020, the number of used lithium-ion batteries in the world will be about 25 billion, with a weight of 500,000 tons. However, waste lithium-ion batteries contain a variety of harmful substances, such as organic solvents, heavy metals and toxic gases, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54C01D15/08
Inventor 陈洪波刘少北
Owner 廖智华
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