CN115709978A - Method for recovering positive plate material in lithium iron phosphate battery - Google Patents
Method for recovering positive plate material in lithium iron phosphate battery Download PDFInfo
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- CN115709978A CN115709978A CN202211517857.1A CN202211517857A CN115709978A CN 115709978 A CN115709978 A CN 115709978A CN 202211517857 A CN202211517857 A CN 202211517857A CN 115709978 A CN115709978 A CN 115709978A
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- China
- Prior art keywords
- positive plate
- iron phosphate
- lithium iron
- recycling method
- phosphate battery
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- 239000000463 material Substances 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 44
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 title claims abstract description 25
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 28
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 19
- 239000010935 stainless steel Substances 0.000 claims abstract description 19
- 239000011888 foil Substances 0.000 claims abstract description 17
- 239000002245 particle Substances 0.000 claims abstract description 15
- 239000000126 substance Substances 0.000 claims abstract description 15
- 238000007873 sieving Methods 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 13
- 238000002791 soaking Methods 0.000 claims abstract description 10
- 239000008213 purified water Substances 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 238000004064 recycling Methods 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 238000012216 screening Methods 0.000 abstract description 8
- 238000011084 recovery Methods 0.000 abstract description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 229910052744 lithium Inorganic materials 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 abstract description 5
- 238000002309 gasification Methods 0.000 abstract description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910010710 LiFePO Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229910000398 iron phosphate Inorganic materials 0.000 description 1
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/84—Recycling of batteries or fuel cells
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- Manufacture And Refinement Of Metals (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a method for recovering positive plate materials in a lithium iron phosphate battery, which comprises the following steps: splitting the positive plate containing the aluminum foil from the lithium iron phosphate battery; soaking the positive plate in purified water, and then sequentially draining and drying; after the dried positive plate is cooled, crushing by using a stainless steel crusher to obtain a crushed material; sieving the crushed material to remove aluminum particles, and baking the undersize product to obtain a baked material; and (3) sieving the baked material to remove aluminum powder, and removing magnetic substances in undersize materials to obtain the positive plate material. The recovery method of the invention naturally separates and drops the positive plate and the aluminum foil through a physical reaction process, removes aluminum particles in a screener through particle size treatment, decomposes organic matters in a gasification body through high temperature, and finally obtains a finished product through fine screening and magnetic substance removal; the recovery method has the advantages of low process cost, high efficiency and practical and simple process, and can effectively meet the raw material requirements of middle-low-end lithium battery manufacturers.
Description
Technical Field
The invention relates to the technical field of waste resource recycling, in particular to a method for recycling a positive plate material in a lithium iron phosphate battery.
Background
A lithium iron phosphate battery is a lithium iron phosphate (LiFePO) 4 ) The lithium ion battery using carbon as a cathode material has a cell rated voltage of 3.2V and a charge cut-off voltage of 3.6V to 3.65V. In the charging process, part of lithium ions in the lithium iron phosphate are removed, transferred to a negative electrode through an electrolyte and embedded into a negative electrode carbon material; meanwhile, electrons are released from the anode and reach the cathode from an external circuit, so that the balance of chemical reaction is maintained. During the discharging process, lithium ions are extracted from the negative electrode and reach the positive electrode through the electrolyte, meanwhile, electrons are released from the negative electrode and reach the positive electrode from an external circuit,providing energy for the outside. The lithium iron phosphate battery has the advantages of high working voltage, high energy density, long cycle life, good safety performance, small self-discharge rate and no memory effect.
At present, the safety and the stability of the iron phosphate battery are recognized by groups and are widely applied to the field of new energy automobiles, and various elements in the anode sheet are scarce, so that various elements are still in a state of supply and demand shortage, and the strength of the resource recovery industry needs to be increased. Technical routes of some regeneration mechanisms in the industry are generally based on acid wet recovery, and a large amount of chemical materials are required to be added for extraction, so that the production cost is high, and certain pollution is caused to the environment.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a method for recovering positive plate materials in lithium iron phosphate batteries, which has the advantages of low cost, high efficiency and practical and simple process and can effectively meet the raw material requirements of middle-and-low-end lithium battery manufacturers.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
the invention provides a method for recovering positive plate materials in a lithium iron phosphate battery, which comprises the following steps:
(a) Splitting the positive plate containing the aluminum foil from the lithium iron phosphate battery;
(b) Soaking the positive plate in purified water, and then sequentially draining and drying;
(c) After the dried positive plate is cooled, crushing the positive plate by using a stainless steel crusher to obtain a crushed material;
(d) Sieving the crushed material to remove aluminum particles, and baking the undersize product to obtain a baked material;
(e) And sieving the baked material to remove aluminum powder, and removing magnetic substances in undersize materials to obtain the positive plate material.
Preferably, in the step (c), the control parameters of the stainless steel crusher are as follows: the rotating speed is 1500r/min; the aperture of the screen mesh is 9mm.
Preferably, in the step (d), the crushed material is sieved by a 55-65 mesh sieve to remove aluminum particles.
Preferably, in the step (e), the roasted material is sieved by a 380-420 mesh sieve to remove aluminum powder.
Preferably, in the step (b), the soaking time is 3-5 h.
Preferably, in the step (b), the drying temperature is 350-400 ℃.
Preferably, in the step (d), the baking temperature is 460-500 ℃, and the baking time is 3-5 h.
Preferably, in the step (e), the roasted material is sieved by using a stainless steel rotary vibration sieve.
Preferably, in the step (e), a 20000GS dry full-automatic powder iron remover is used to remove magnetic substances in the undersize material.
Compared with the prior art, the invention has the beneficial effects that at least:
according to the method for recovering the positive plate material in the lithium iron phosphate battery, the positive plate and aluminum foil are naturally separated and fall off through a physical reaction process, then the positive plate and the aluminum foil are purified in a screening machine through particle size treatment to obtain high-purity black powder, organic matters in a gasification body are cracked at high temperature to further improve the purity, and then a finished product is finally obtained through fine screening and magnetic substance removal; the recovery method has the advantages of low process cost, high efficiency, practical and simple process and high purity of recovered products, and can effectively meet the raw material requirements of middle-low-end lithium battery manufacturers.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the following examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only used as examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention belongs.
The embodiment of the invention provides a method for recovering a positive plate material in a lithium iron phosphate battery, which comprises the following steps:
(a) Splitting the positive plate containing the aluminum foil from the lithium iron phosphate battery;
(b) Soaking the positive plate in purified water, and then sequentially draining and drying to enable the positive plate to be naturally separated from the aluminum foil;
(c) After the dried positive plate is cooled, crushing by using a stainless steel crusher to obtain a crushed material, and layering the crushing granularity of the aluminum foil and the positive plate by crushing to realize sieving separation of the aluminum foil and the positive plate;
(d) Sieving the crushed material to remove aluminum particles, and baking the undersize product to obtain a baked material;
(e) And sieving the baked material to remove aluminum powder, and removing magnetic substances in undersize materials to obtain the positive plate material.
According to the method for recovering the positive plate material in the lithium iron phosphate battery, the positive plate and aluminum foil are naturally separated and fall off through a physical reaction process, then the positive plate and the aluminum foil are purified in a screening machine through particle size treatment to obtain high-purity black powder, organic matters in a gasification body are cracked at high temperature to further improve the purity, and then a finished product is finally obtained through fine screening and magnetic substance removal; the recovery method has the advantages of low process cost, high efficiency, practical and simple process and high purity of recovered products, and can effectively meet the raw material requirements of middle-low-end lithium battery manufacturers.
In one embodiment, in the step (c), the control parameters of the stainless steel crusher are: the rotating speed is 1500r/min; the aperture of the screen mesh is 9mm.
In one embodiment, in step (d), the crushed material is sieved through a 55-65 mesh sieve to remove aluminum particles.
In a real-time mode, in the step (e), the roasted material is sieved by a 380-420 mesh sieve to remove aluminum powder.
In a real-time mode, the soaking time in the step (b) is 3-5 h.
In a real-time mode, in the step (b), the drying temperature is 350-400 ℃.
In a real-time mode, in the step (d), the baking temperature is 460-500 ℃, and the baking time is 3-5 h.
In a real-time mode, in the step (e), a stainless steel rotary vibration sieve is adopted to sieve the roasted material through a 380-420 mesh sieve.
In a real-time mode, in the step (e), a 20000GS dry full-automatic powder iron remover is adopted to remove the magnetic substances in the undersize materials.
The technical solution of the present invention is further described in detail by the following specific examples.
Example 1
The embodiment is a method for recovering a positive electrode sheet material in a lithium iron phosphate battery, and the method comprises the following steps:
(a) Splitting an anode plate containing an aluminum foil from a lithium iron phosphate battery;
(b) Soaking the positive plate in purified water for 3 hours, and then sequentially draining and drying, wherein the drying temperature is 350 ℃;
(c) After the dried positive plate is cooled, crushing by using a stainless steel crusher to obtain a crushed material, wherein the control parameters of the stainless steel crusher are as follows: the rotating speed is 1500r/min; the aperture of the screen mesh is 9mm;
(d) Sieving the crushed material with a 55-mesh sieve to remove aluminum particles, and baking the undersize material at 460 ℃ for 5 hours to obtain a baked material;
(e) And (3) sieving the roasted material through a 420-mesh sieve by using a stainless steel rotary vibration sieve to remove aluminum powder, and removing magnetic substances in undersize materials by using a 20000GS dry-method full-automatic powder iron remover to obtain the positive plate material.
Example 2
The embodiment is a method for recovering a positive electrode sheet material in a lithium iron phosphate battery, and the method comprises the following steps:
(a) Splitting an anode plate containing an aluminum foil from a lithium iron phosphate battery;
(b) Placing the positive plate in purified water, soaking for 5 hours, and then sequentially draining and drying, wherein the drying temperature is 400 ℃;
(c) After the dried positive plate is cooled, a stainless steel crusher is adopted for crushing to obtain a crushed material, wherein the control parameters of the stainless steel crusher are as follows: the rotating speed is 1500r/min; the aperture of the screen mesh is 9mm;
(d) Sieving the crushed material with a 65-mesh sieve to remove aluminum particles, and baking the undersize material at 500 ℃ for 3 hours to obtain a baked material;
(e) And (3) screening the baked material through a 380-mesh sieve by using a stainless steel rotary vibration sieve to remove aluminum powder, and removing magnetic substances in undersize materials by using a 20000GS dry-method full-automatic powder iron remover to obtain the positive plate material.
Example 3
The embodiment is a method for recovering a positive electrode sheet material in a lithium iron phosphate battery, and the method comprises the following steps:
(a) Splitting the positive plate containing the aluminum foil from the lithium iron phosphate battery;
(b) Soaking the positive plate in purified water for 4 hours, and then sequentially draining and drying, wherein the drying temperature is 380 ℃;
(c) After the dried positive plate is cooled, crushing by using a stainless steel crusher to obtain a crushed material, wherein the control parameters of the stainless steel crusher are as follows: the rotating speed is 1500r/min; the aperture of the screen mesh is 9mm;
(d) Sieving the crushed material with a 60-mesh sieve to remove aluminum particles, and baking the undersize material at 480 ℃ for 4 hours to obtain a baked material;
(e) And (3) sieving the baked material with a 400-mesh sieve by using a stainless steel rotary vibration sieve to remove aluminum powder, and removing magnetic substances in undersize materials by using a 20000GS dry-method full-automatic powder iron remover to obtain the positive plate material.
According to the method for recovering the positive plate material in the lithium iron phosphate battery, the positive plate and aluminum foil are naturally separated and fall off through a physical reaction process, then the positive plate and the aluminum foil are purified in a screening machine through particle size treatment to obtain high-purity black powder, organic matters in a gasification body are cracked at high temperature to further improve the purity, and then a finished product is finally obtained through fine screening and magnetic substance removal; the recovery method has the advantages of low process cost, high efficiency, practical and simple process and high purity of recovered products, and can effectively meet the raw material requirements of middle-and-low-end lithium battery manufacturers.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being covered by the appended claims and their equivalents.
Claims (9)
1. A method for recovering positive plate materials in a lithium iron phosphate battery is characterized by comprising the following steps:
(a) Splitting an anode plate containing an aluminum foil from a lithium iron phosphate battery;
(b) Soaking the positive plate in purified water, and then sequentially draining and drying;
(c) After the dried positive plate is cooled, crushing by using a stainless steel crusher to obtain a crushed material;
(d) Sieving the crushed material to remove aluminum particles, and baking the sieved material to obtain a baked material;
(e) And sieving the baked material to remove aluminum powder, and removing magnetic substances in undersize materials to obtain the positive plate material.
2. The recycling method according to claim 1, wherein in the step (c), the control parameters of the stainless steel crusher are: the rotating speed is 1500r/min; the aperture of the screen mesh is 9mm.
3. A recycling method according to claim 1, wherein in step (d), the crushed material is passed through a 55-65 mesh sieve to remove aluminum particles.
4. The recycling method according to claim 1, wherein in the step (e), the roasted material is sieved with a 380 to 420 mesh sieve to remove the aluminum powder.
5. The recycling method according to claim 1, wherein the soaking time in the step (b) is 3 to 5 hours.
6. The recycling method according to claim 1, wherein the drying temperature in the step (b) is 350 to 400 ℃.
7. The recycling method according to claim 1, wherein in the step (d), the baking temperature is 460 to 500 ℃ and the baking time is 3 to 5 hours.
8. A recycling method according to claim 1, wherein in step (e), the roasted material is sieved using a stainless steel rotary vibrating sieve.
9. The recycling method according to claim 1, wherein in the step (e), magnetic substances in undersize materials are removed by using a dry full-automatic powder iron remover of 20000 GS.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211517857.1A CN115709978A (en) | 2022-11-30 | 2022-11-30 | Method for recovering positive plate material in lithium iron phosphate battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211517857.1A CN115709978A (en) | 2022-11-30 | 2022-11-30 | Method for recovering positive plate material in lithium iron phosphate battery |
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| CN115709978A true CN115709978A (en) | 2023-02-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101383441A (en) * | 2007-09-06 | 2009-03-11 | 深圳市比克电池有限公司 | Synthetic recovering method for positive pole waste tablet from ferric phosphate lithium cell |
| US20180212282A1 (en) * | 2017-01-25 | 2018-07-26 | Lg Chem, Ltd. | Method for recovering positive electrode active material from lithium secondary battery |
| CN109256595A (en) * | 2018-08-06 | 2019-01-22 | 株洲冶炼集团股份有限公司 | A kind of method that the useless powder pyrogenic method directly reparation of LiFePO4 prepares battery-grade iron phosphate lithium |
| CN113083848A (en) * | 2021-03-10 | 2021-07-09 | 深圳清研装备科技有限公司 | Sorting and recycling method for positive and negative electrode materials of waste lithium iron phosphate batteries |
| CN114204150A (en) * | 2021-12-03 | 2022-03-18 | 安徽南都华铂新材料科技有限公司 | Method for recycling lithium iron phosphate anode material from lithium iron phosphate anode plate |
| CN114784271A (en) * | 2022-04-26 | 2022-07-22 | 威尔能环保科技(苏州)有限公司 | Regenerated lithium iron phosphate positive electrode material, preparation method and application |
| CN115064803A (en) * | 2022-07-22 | 2022-09-16 | 北辰先进循环科技(青岛)有限公司 | Method for efficiently recovering waste lithium iron phosphate battery positive electrode material with low energy consumption |
| CN115156243A (en) * | 2022-07-18 | 2022-10-11 | 中国地质科学院郑州矿产综合利用研究所 | Recovery process of anode and cathode materials of waste battery |
-
2022
- 2022-11-30 CN CN202211517857.1A patent/CN115709978A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101383441A (en) * | 2007-09-06 | 2009-03-11 | 深圳市比克电池有限公司 | Synthetic recovering method for positive pole waste tablet from ferric phosphate lithium cell |
| US20180212282A1 (en) * | 2017-01-25 | 2018-07-26 | Lg Chem, Ltd. | Method for recovering positive electrode active material from lithium secondary battery |
| CN109256595A (en) * | 2018-08-06 | 2019-01-22 | 株洲冶炼集团股份有限公司 | A kind of method that the useless powder pyrogenic method directly reparation of LiFePO4 prepares battery-grade iron phosphate lithium |
| CN113083848A (en) * | 2021-03-10 | 2021-07-09 | 深圳清研装备科技有限公司 | Sorting and recycling method for positive and negative electrode materials of waste lithium iron phosphate batteries |
| CN114204150A (en) * | 2021-12-03 | 2022-03-18 | 安徽南都华铂新材料科技有限公司 | Method for recycling lithium iron phosphate anode material from lithium iron phosphate anode plate |
| CN114784271A (en) * | 2022-04-26 | 2022-07-22 | 威尔能环保科技(苏州)有限公司 | Regenerated lithium iron phosphate positive electrode material, preparation method and application |
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