CN118060299B - Recovery method of waste battery negative electrode graphite - Google Patents
Recovery method of waste battery negative electrode graphite Download PDFInfo
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- CN118060299B CN118060299B CN202410504977.0A CN202410504977A CN118060299B CN 118060299 B CN118060299 B CN 118060299B CN 202410504977 A CN202410504977 A CN 202410504977A CN 118060299 B CN118060299 B CN 118060299B
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 61
- 239000010439 graphite Substances 0.000 title claims abstract description 61
- 238000011084 recovery Methods 0.000 title claims abstract description 18
- 239000010926 waste battery Substances 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000012535 impurity Substances 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000002253 acid Substances 0.000 claims abstract description 14
- 238000000227 grinding Methods 0.000 claims abstract description 12
- 238000002386 leaching Methods 0.000 claims abstract description 12
- 238000004064 recycling Methods 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 36
- BKIMMITUMNQMOS-UHFFFAOYSA-N nonane Chemical compound CCCCCCCCC BKIMMITUMNQMOS-UHFFFAOYSA-N 0.000 claims description 24
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 22
- 238000005188 flotation Methods 0.000 claims description 22
- 239000012141 concentrate Substances 0.000 claims description 20
- 239000006260 foam Substances 0.000 claims description 18
- WJTCGQSWYFHTAC-UHFFFAOYSA-N cyclooctane Chemical compound C1CCCCCCC1 WJTCGQSWYFHTAC-UHFFFAOYSA-N 0.000 claims description 12
- 239000004914 cyclooctane Substances 0.000 claims description 12
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 11
- 229910017604 nitric acid Inorganic materials 0.000 claims description 11
- 238000005406 washing Methods 0.000 claims description 11
- 238000001035 drying Methods 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 238000009423 ventilation Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- WUOACPNHFRMFPN-UHFFFAOYSA-N alpha-terpineol Chemical compound CC1=CCC(C(C)(C)O)CC1 WUOACPNHFRMFPN-UHFFFAOYSA-N 0.000 claims description 3
- SQIFACVGCPWBQZ-UHFFFAOYSA-N delta-terpineol Natural products CC(C)(O)C1CCC(=C)CC1 SQIFACVGCPWBQZ-UHFFFAOYSA-N 0.000 claims description 3
- 229940116411 terpineol Drugs 0.000 claims description 3
- 239000002002 slurry Substances 0.000 abstract description 4
- 238000000926 separation method Methods 0.000 abstract description 3
- 150000002500 ions Chemical class 0.000 abstract description 2
- 239000007791 liquid phase Substances 0.000 abstract description 2
- 239000007787 solid Substances 0.000 abstract description 2
- 150000007513 acids Chemical class 0.000 abstract 1
- 238000004090 dissolution Methods 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 229910044991 metal oxide Inorganic materials 0.000 abstract 1
- 150000004706 metal oxides Chemical class 0.000 abstract 1
- 238000007781 pre-processing Methods 0.000 abstract 1
- 239000002699 waste material Substances 0.000 description 7
- 239000010665 pine oil Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 229910021383 artificial graphite Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 239000011331 needle coke Substances 0.000 description 1
- 239000006253 pitch coke Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
- B03B1/04—Conditioning for facilitating separation by altering physical properties of the matter to be treated by additives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/02—Froth-flotation processes
- B03D1/025—Froth-flotation processes adapted for the flotation of fines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
- B09B3/35—Shredding, crushing or cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/70—Chemical treatment, e.g. pH adjustment or oxidation
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/20—Graphite
- C01B32/21—After-treatment
- C01B32/215—Purification; Recovery or purification of graphite formed in iron making, e.g. kish graphite
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/54—Reclaiming serviceable parts of waste accumulators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B2101/00—Type of solid waste
- B09B2101/15—Electronic waste
- B09B2101/16—Batteries
-
- 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
Landscapes
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Electrochemistry (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a method for recycling waste battery negative electrode graphite. Firstly, finely grinding and preprocessing the negative electrode graphite to enable the graphite and impurities to be dissociated as far as possible. Transferring the finely ground fine fraction graphite slurry into an acid-resistant container, adding water, and then adding one or more acids to the finely ground fine fraction graphite slurry for impurity leaching. Impurities (metal and metal oxide) dissolved in acid in the leached negative electrode graphite enter a liquid phase in the form of ions, so that separation of graphite and acid-soluble impurities is realized; in addition, dissolution of acid-soluble impurities also accelerates separation of insoluble impurities from graphite. The acid-insoluble impurities are finely ground and leached, then dissociated from the graphite, and dispersed in the slurry as solids. Finally, separating acid-insoluble impurities and soluble impurities in graphite and ore pulp by a floatation method to obtain high-purity graphite, and integrally purifying and separating the negative electrode graphite. The process can effectively solve the problems of low product purity, long treatment flow and high cost in the recovery of the negative graphite.
Description
Technical Field
The invention relates to the field of batteries, in particular to a method for recycling waste battery negative electrode graphite.
Background
Currently, the global new energy automobile industry is rapidly developing. The scrapped amount of the waste lithium ion battery is rapidly increased while the new energy automobile industry is rapidly developed.
The waste graphite is reasonably recycled to realize the reutilization of resources and the environmental protection in the face of huge battery scrappage and wide power battery demand. Heretofore, waste batteries have been generally disposed of in incinerated or buried forms, which can have an irreversible effect on the environment and also be a waste of resources. For recycling of waste graphite negative electrode resources, the atmospheric pollution generated in the traditional treatment process can be effectively reduced, unnecessary waste of available resources such as graphite and the like is reduced, and therefore sustainable development of the battery industry is facilitated. In addition, the graphitization treatment of the artificial graphite consumes 1.25 ten thousand DEG of electricity in one working procedure, and the prices of needle coke and pitch coke which are raw materials of the artificial graphite are high, so that huge energy consumption, low carbon and environmental protection are brought, and huge cost pressure is brought to battery manufacturers at the downstream. The method can recycle the battery cathode graphite, not only can relieve a great deal of demands on graphite in the market, but also can solve the problems of high pollution and high energy consumption in the purification of natural graphite. Therefore, the reasonable and effective recycling of the waste graphite is achieved. At present, the recovery of the graphite of the negative electrode of the waste battery is mainly carried out by combining flotation and metallurgy. The flotation method is to perform flotation separation on the waste graphite cathode by utilizing the floatability difference between graphite and impurities, but the purity of the recovered product is insufficient for commercial application. Thus, the concentrate after flotation often needs to be purified by means of acid leaching, resulting in a longer electrode recovery process.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a method for purifying and separating negative graphite, which realizes the efficient recycling of the negative graphite.
The technical scheme of the invention is as follows:
the method for recycling the graphite of the negative electrode of the waste battery comprises the following steps:
Taking 100-150g of waste battery cathode graphite and 100-150mL of water, placing in a planetary mill, finely grinding for 5-10min, washing out the ore, transferring to a 1-1.2L beaker, and adding 500-600g of water for stirring; adding mixed acid liquor of hydrochloric acid and nitric acid according to the volume ratio of 5-7:1, regulating the pH value to 1.2-3.0, and stirring and leaching for 30-60min; then adding a collector and stirring for 5-10min, and adding 300-400g/t of terpineol oil and stirring for 3-10min, wherein the composition of the collector is 150-360g/t of n-nonane and 150-360g/t of cyclooctane; pouring the leached ore pulp into a flotation column, and carrying out ventilation flotation to obtain foam concentrate and impurity tailings; and finally, filtering, washing and drying the foam concentrate to obtain the high-purity graphite.
Preferably, the fine grinding time is 5min.
Preferably, the volume ratio of the hydrochloric acid to the nitric acid is 5:1.
Preferably, the pH is 1.2.
Preferably, the n-nonane is 241g/t.
Preferably, the cyclooctane is 283g/t.
Preferably, the recovery of graphite is over 90%.
Preferably, the recovery of graphite is in excess of 97%.
The invention develops an integrated process for purifying and separating the negative electrode graphite by utilizing the characteristics of good natural floatability of the graphite and good acid resistance of a graphite collector. Leaching the negative graphite before floatation, transferring acid-soluble solid-phase impurities into a liquid phase in the form of ions, and dissociating acid-insoluble impurities into slurry in the form of solids; and then separating graphite from impurities through floatation to obtain high-purity graphite concentrate.
On the other hand, conventional graphite collectors such as heavy oil, diesel oil, kerosene and the like are hydrocarbon oil mixtures with complex components, and it is difficult to achieve uniform components and uniform collecting results. The invention selects n-nonane (C 9H20) and cyclooctane (C 8H16) as composite collectors, avoids the problem that the components of the collectors are difficult to determine, and can effectively recycle graphite in electrode materials.
Detailed Description
The technical effects of the present invention are verified by the following specific examples, but the embodiments of the present invention are not limited thereto.
The impurity types and contents before the negative electrode graphite treatment in the examples and comparative examples of the present invention are shown in table 1.
Example 1
100G of waste battery cathode graphite and 100ml of water are taken and placed in a planetary mill, after fine grinding of 5min, the ore is washed out, transferred into a 1L beaker, and 500g of water is added for stirring. Then adding mixed acid liquor of hydrochloric acid and nitric acid according to the volume ratio of 5:1, regulating the pH value to 1.2, and stirring and leaching for 30min. Then adding a collector and stirring for 5min, and adding 300g/t of pine oil and stirring for 3min, wherein the composition of the collector is 150g/t of n-nonane and 150g/t of cyclooctane. And pouring the leached ore pulp into a flotation column, and performing ventilation flotation to obtain foam concentrate and impurity tailings. And finally, filtering, washing and drying the foam concentrate to obtain the high-purity graphite.
Example 2
100G of waste battery cathode graphite and 100ml of water are taken and placed in a planetary mill, after fine grinding of 5min, the ore is washed out, transferred into a 1L beaker, and 500g of water is added for stirring. Then adding mixed acid liquor of hydrochloric acid and nitric acid according to the volume ratio of 5:1, regulating the pH value to 1.2, and stirring and leaching for 30min. Then adding a collector and stirring for 5min, and adding 300g/t of pine oil and stirring for 3min, wherein the composition of the collector is 200g/t of n-nonane and 200g/t of cyclooctane. And pouring the leached ore pulp into a flotation column, and performing ventilation flotation to obtain foam concentrate and impurity tailings. And finally, filtering, washing and drying the foam concentrate to obtain the high-purity graphite.
Example 3
100G of waste battery cathode graphite and 100ml of water are taken and placed in a planetary mill, after fine grinding of 5min, the ore is washed out, transferred into a 1L beaker, and 500g of water is added for stirring. Then adding mixed acid liquor of hydrochloric acid and nitric acid according to the volume ratio of 5:1, regulating the pH value to 1.2, and stirring and leaching for 30min. Then adding a collector and stirring for 5min, and adding 300g/t of pine oil and stirring for 3min, wherein the composition of the collector is 241g/t of n-nonane and 283g/t of cyclooctane. And pouring the leached ore pulp into a flotation column, and performing ventilation flotation to obtain foam concentrate and impurity tailings. And finally, filtering, washing and drying the foam concentrate to obtain the high-purity graphite.
Example 4
100G of waste battery cathode graphite and 100ml of water are taken and placed in a planetary mill, after fine grinding of 5min, the ore is washed out, transferred into a 1L beaker, and 500g of water is added for stirring. Then adding mixed acid liquor of hydrochloric acid and nitric acid according to the volume ratio of 5:1, regulating the pH value to 1.2, and stirring and leaching for 30min. Then adding a collector and stirring for 5min, and adding 300g/t of pine oil and stirring for 3min, wherein the composition of the collector is 300g/t of n-nonane and 300g/t of cyclooctane. And pouring the leached ore pulp into a flotation column, and performing ventilation flotation to obtain foam concentrate and impurity tailings. And finally, filtering, washing and drying the foam concentrate to obtain the high-purity graphite.
Example 5
100G of waste battery cathode graphite and 100ml of water are taken and placed in a planetary mill, after fine grinding of 5min, the ore is washed out, transferred into a 1L beaker, and 500g of water is added for stirring. Then adding mixed acid liquor of hydrochloric acid and nitric acid according to the volume ratio of 5:1, regulating the pH value to 1.2, and stirring and leaching for 30min. Then adding a collector and stirring for 5min, and adding 300g/t of pine oil and stirring for 3min, wherein the composition of the collector is 360g/t of n-nonane and 360g/t of cyclooctane. And pouring the leached ore pulp into a flotation column, and performing ventilation flotation to obtain foam concentrate and impurity tailings. And finally, filtering, washing and drying the foam concentrate to obtain the high-purity graphite.
Comparative example 1
100G of waste battery cathode graphite and 100ml of water are taken and placed in a planetary mill, after fine grinding of 5min, the ore is washed out, transferred into a 1L beaker, and 500g of water is added for stirring. Then adding mixed acid liquor of hydrochloric acid and nitric acid according to the volume ratio of 5:1, regulating the pH value to 1.2, and stirring and leaching for 30min. Then adding a collector and stirring for 5min, and adding 300g/t of pine pollen oil and stirring for 3min, wherein the collector is 524g/t of n-nonane. And pouring the leached ore pulp into a flotation column, and performing ventilation flotation to obtain foam concentrate and impurity tailings. And finally, filtering, washing and drying the foam concentrate to obtain the high-purity graphite.
Comparative example 2
100G of waste battery cathode graphite and 100ml of water are taken and placed in a planetary mill, after fine grinding of 5min, the ore is washed out, transferred into a 1L beaker, and 500g of water is added for stirring. Then adding mixed acid liquor of hydrochloric acid and nitric acid according to the volume ratio of 5:1, regulating the pH value to 1.2, and stirring and leaching for 30min. Then adding a collector and stirring for 5min, and adding 300g/t of terpineol oil and stirring for 3min, wherein the collector is 524g/t of cyclooctane. And pouring the leached ore pulp into a flotation column, and performing ventilation flotation to obtain foam concentrate and impurity tailings. And finally, filtering, washing and drying the foam concentrate to obtain the high-purity graphite.
The inventors measured the recovery rate of negative electrode graphite in examples 1 to 5 and comparative examples 1 to 2, and experimental data of each sample are shown in table 2.
From the experimental results in table 2, it can be seen that the present invention can effectively recover the negative graphite material of the waste battery using n-nonane and cyclooctane as composite collectors, and in the most preferred embodiment, the recovery rate is as high as 97.26%.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (8)
1. The method for recycling the graphite of the negative electrode of the waste battery is characterized by comprising the following steps of:
Taking 100-150g of waste battery cathode graphite and 100-150mL of water, placing in a planetary mill, finely grinding for 5-10min, washing out the ore, transferring to a 1-1.2L beaker, and adding 500-600g of water for stirring; adding mixed acid liquor of hydrochloric acid and nitric acid according to the volume ratio of 5-7:1, regulating the pH value to 1.2-3.0, and stirring and leaching for 30-60min; then adding a collector and stirring for 5-10min, and adding 300-400g/t of terpineol oil and stirring for 3-10min, wherein the composition of the collector is 150-360g/t of n-nonane and 150-360g/t of cyclooctane; pouring the leached ore pulp into a flotation column, and carrying out ventilation flotation to obtain foam concentrate and impurity tailings; and finally, filtering, washing and drying the foam concentrate to obtain the high-purity graphite.
2. The recovery method of claim 1, wherein the fine grinding time is 5 minutes.
3. The recovery method of claim 1, wherein the volume ratio of hydrochloric acid to nitric acid is 5:1.
4. The recovery method of claim 1, wherein the pH is 1.2.
5. A recovery process according to claim 1, wherein the n-nonane is 241g/t.
6. The recovery process of claim 5, wherein the cyclooctane is 283g/t.
7. A recovery process according to claim 1, wherein the recovery of graphite exceeds 90%.
8. A recovery process according to claim 1, wherein the recovery of graphite exceeds 97%.
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| CN108039530A (en) * | 2017-10-16 | 2018-05-15 | 深圳市沃特玛电池有限公司 | A kind of reclaiming technique of old and useless battery graphite material |
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| CA3209653A1 (en) * | 2017-05-30 | 2018-12-06 | Li-Cycle Corp. | A process, apparatus, and system for recovering materials from batteries |
| DE102019006084A1 (en) * | 2019-02-12 | 2020-08-13 | Elke Münch | Mechanochemical process |
| EP3766982A1 (en) * | 2019-07-18 | 2021-01-20 | Delft Advanced Biofuels B.V. | Integrated system for biocatalytically producing and recovering an organic substance |
| CN112157107A (en) * | 2020-08-28 | 2021-01-01 | 威立雅新能源科技(江门)有限公司 | Method for separating positive and negative electrode materials from waste lithium batteries |
| WO2023227032A1 (en) * | 2022-05-25 | 2023-11-30 | 巴斯夫欧洲公司 | Method for preparing battery-grade graphite by using mixed waste of positive and negative electrode materials of failed lithium-ion battery as raw material |
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| 湖南鲁塘隐晶质石墨矿选矿试验研究;贺国帅;陈代雄;杨建文;曾惠明;;矿产保护与利用;20181109(第05期);全文 * |
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