CN115007614A - Sorting method for broken materials of positive and negative pole pieces of waste lithium ion battery - Google Patents
Sorting method for broken materials of positive and negative pole pieces of waste lithium ion battery Download PDFInfo
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- CN115007614A CN115007614A CN202210868310.XA CN202210868310A CN115007614A CN 115007614 A CN115007614 A CN 115007614A CN 202210868310 A CN202210868310 A CN 202210868310A CN 115007614 A CN115007614 A CN 115007614A
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- 239000000463 material Substances 0.000 title claims abstract description 46
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 45
- 239000002699 waste material Substances 0.000 title claims abstract description 33
- 239000007788 liquid Substances 0.000 claims abstract description 18
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 16
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 238000000227 grinding Methods 0.000 claims abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000004380 ashing Methods 0.000 claims abstract description 10
- 229910052802 copper Inorganic materials 0.000 claims abstract description 10
- 239000010949 copper Substances 0.000 claims abstract description 10
- 239000007774 positive electrode material Substances 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000007873 sieving Methods 0.000 claims abstract description 6
- 238000004064 recycling Methods 0.000 claims abstract description 3
- 239000002245 particle Substances 0.000 claims description 23
- 239000000203 mixture Substances 0.000 claims description 20
- 239000011230 binding agent Substances 0.000 claims description 12
- 239000011812 mixed powder Substances 0.000 claims description 10
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 8
- 239000011889 copper foil Substances 0.000 claims description 6
- 239000011888 foil Substances 0.000 claims description 6
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 4
- 238000011068 loading method Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 239000002356 single layer Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical group [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 2
- 230000010349 pulsation Effects 0.000 claims description 2
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 claims 1
- 230000001070 adhesive effect Effects 0.000 claims 1
- 238000012216 screening Methods 0.000 claims 1
- 229910002804 graphite Inorganic materials 0.000 abstract description 5
- 239000010439 graphite Substances 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 239000006183 anode active material Substances 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 239000002033 PVDF binder Substances 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 3
- 239000007773 negative electrode material Substances 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000005119 centrifugation Methods 0.000 description 2
- 238000010494 dissociation reaction Methods 0.000 description 2
- 230000005593 dissociations Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 229910012820 LiCoO Inorganic materials 0.000 description 1
- 229910015643 LiMn 2 O 4 Inorganic materials 0.000 description 1
- 229910013290 LiNiO 2 Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010332 dry classification Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 150000002696 manganese Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000001698 pyrogenic effect Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
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- 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
- B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
-
- 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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Secondary Cells (AREA)
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Abstract
The invention discloses a sorting method of broken materials of positive and negative pole pieces of a waste lithium ion battery, which comprises the following steps: (1) carrying out low-temperature plasma ashing on the broken materials of the positive and negative pole pieces of the waste lithium ion battery; (2) grinding the incinerated material by using a dry stirring mill to obtain an ultrafine material; (3) sieving the superfine powder by using an ultrasonic vibration sieve to obtain oversize and undersize products; (4) sorting the oversize products by using a pulsating micro-airflow sorting machine to obtain copper and aluminum; (5) preparing heavy liquid, and separating undersize products by using a centrifugal machine to obtain light and heavy products; (6) and respectively heating the light and heavy products, and condensing and recovering steam. The invention has the beneficial effects that: the physical crushing and sorting technology is used for recycling the crushed materials of the positive and negative pole pieces of the waste lithium ion battery to finally obtain copper, aluminum, a positive active material and negative graphite.
Description
Technical Field
The invention relates to the technology of the field of waste lithium ion battery recovery, in particular to a method for sorting broken materials of positive and negative pole pieces of a waste lithium ion battery.
Background
China is a large country for lithium ion battery production and consumption, and since the commercialization of lithium ion batteries, the lithium ion battery yield in China is continuously and rapidly increased. Recent data show that the yield of lithium ion power batteries exceeds 120 hundred million in 2018. Generally, the service life of the lithium ion power battery is 2-3 years, and after the lithium ion power battery is used for hundreds of times, the electrode expands, the capacity is reduced, and the lithium ion power battery is scrapped. Except for a new energy automobile power battery, portable equipment such as electronics, communication and the like is also a large household consumed by a lithium ion battery, and the product is rapidly updated, so that the service life of the lithium ion battery is shortened, and the lithium ion battery is scrapped in advance. From the viewpoint of environmental protection or from the dilemma of relieving the shortage of important strategic metal resources in China, the resource treatment is urgently needed.
The lithium ion battery positive electrode comprises an aluminum foil current collector with the thickness of 20 mu m and a positive electrode active material (LiCoO) with the mass fraction of 90 percent uniformly coated on the aluminum foil current collector 2 、LiNiO 2 、LiMn 2 O 4 Etc.), 3% -4% of polyvinylidene fluoride (PVDF) binder and 6% -7% of electrolyte; the negative electrode mainly comprises a copper foil current collector with the thickness of 15 mu m, a negative active material uniformly coated on the copper foil current collector, 6-7% of PVDF binder and 4-5% of electrolyte. In the recovery process of the lithium ion battery, black powder obtained by grading the crushed product is a mixture of positive and negative active materials, and contains a large amount of undissociated and complete copper foil and aluminum foil, which makes further use of the black powder difficult, so that the crushed materials of the positive and negative electrode plates of the waste lithium ion battery need to be further sorted.
At present, various methods are used for recovering crushed materials of positive and negative pole pieces of waste lithium ion batteries, such as removing graphite and organic matters by using a pyrogenic process to obtain a positive active material, obtaining lithium battery material precursors of lithium, nickel, cobalt, manganese salts and the like by using wet acid leaching-fractional extraction, obtaining positive and negative active material concentrates by using a high-gradient magnetic separation method or foam flotation, and the like.
The invention aims to comprehensively recover various valuable components in the crushed materials of the positive and negative electrode plates of the waste lithium ion battery by combining the methods of plasma low-temperature treatment, dry ultrafine crushing, dry grading, dry sorting, heavy liquid centrifugal separation and the like according to the physicochemical characteristics and the composition structure of the crushed materials of the positive and negative electrode plates of the waste lithium ion battery.
Disclosure of Invention
In view of the above, the present invention provides a method for sorting waste lithium ion battery positive and negative plate broken materials, which takes the waste lithium ion battery positive and negative plate broken materials as a research object, and adopts methods such as plasma low-temperature treatment, dry ultrafine grinding, dry classification, dry sorting and heavy liquid centrifugal separation to realize effective recovery of various valuable components in the waste lithium ion battery positive and negative plate broken materials.
In order to achieve the purpose, the invention adopts the following technical scheme:
a sorting method for broken materials of positive and negative pole pieces of a waste lithium ion battery mainly comprises the following steps:
(1) carrying out low-temperature plasma ashing on the broken materials of the positive and negative pole pieces of the waste lithium ion battery to obtain a material without the binder;
(2) grinding the material without the binder by using a dry stirring mill to obtain superfine mixed powder;
(3) sieving the superfine mixed powder by using an ultrasonic vibration sieve to obtain a copper-aluminum particle mixture and a positive and negative electrode powder mixture;
(4) sorting the copper-aluminum mixture by using a pulsating micro-airflow sorting machine to obtain copper particles and aluminum particles;
(5) preparing heavy liquid, and separating the positive and negative electrode powder mixture by using a centrifugal machine to obtain a light product and a heavy product;
(6) and respectively heating the light and heavy products, condensing the organic steam, recovering and recycling the organic steam, and finally obtaining the pure anode active material and the pure cathode graphite powder.
Further, in the step 1, ashing treatment is carried out on the crushed materials of the positive and negative pole pieces of the waste lithium ion battery by using a low-temperature radio frequency plasma ashing instrument, and the surfaces of particles, binders between the particles and copper foil and aluminum foil and other organic components are decomposed, wherein in the process, the equipment is set to have the power of 20-25 w, and the oxygen flow is 40-50 cm 3 Min, the vacuum degree is 0.8-1.0 mbar, the temperature is maintained at 70-80 ℃, and the holding time is 5 hours.
The low-temperature radio frequency plasma ashing instrument selects the parameters, and the removal rate of the binder and the organic components is higher than 98%.
Further, in the step 2, the materials from which the binder and other organic matters are removed are ground by using a dry stirring mill, so as to obtain the superfine mixed powder. In the grinding process, the stirring speed is 250r/min, the grinding medium is zirconium oxide, the ball loading rate is 40%, and the treatment time is 30 min.
The dry type stirring mill selects the parameters, and the material dissociation efficiency is higher than 96%.
Further, in the step 3, an ultrasonic vibration sieve is used for sieving the superfine mixed powder discharged from the stirring mill to obtain a copper-aluminum particle mixture and a positive and negative electrode powder mixture, wherein in the sieving process, a single-layer sieve is used, the diameter of the sieve surface is 50cm, the size of the sieve pore is 0.05mm, the ultrasonic vibration frequency is 30kHz, and the feeding speed is 2 kg/min.
Further, in the step 4, a pulsating micro-airflow separator is used for separating the copper-aluminum mixture to obtain copper particles and aluminum particles. In the separation process, the feeding speed is 5Kg/min, the pulsation frequency is 3-5 Hz, and the air flow speed is 4-6 cm/s.
The pulsating micro-airflow separator selects the parameters, and the separation efficiency of copper and aluminum particles is higher than 95%.
Further, in the step 5, a heavy liquid is prepared, and a centrifuge is used to separate the positive and negative electrode powder mixture to obtain a light product and a heavy product. In the separation process, the heavy liquid is prepared by mixing carbon tetrachloride and No. 6 solvent oil, and the density of the prepared heavy liquid is 1.2g/cm 3 The concentration of the ore pulp is 200g/L, and the rotating speed of a centrifugal machine is 1500 r/min.
Further, in the step 6, the light and heavy products are respectively heated, and the organic steam is condensed and recycled, so that pure anode powder and graphite powder products are finally obtained. In the process, the heating temperature is 100 ℃, and the condensed and refluxed heavy liquid is reused.
Compared with the prior art, the invention has obvious advantages and beneficial effects, specifically as follows:
the method provided by the invention starts from the structural characteristics of the crushed materials of the positive and negative pole pieces of the waste lithium ion battery, and adopts the methods of plasma low-temperature treatment, dry ultrafine crushing, dry grading, dry sorting, heavy liquid centrifugation and the like to effectively recover various valuable components in the crushed materials of the positive and negative pole pieces of the waste lithium ion battery according to the physical and chemical properties of the crushed materials.
To more clearly illustrate the process features and efficacy of the present invention, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments:
drawings
FIG. 1 is a schematic process flow diagram of the process of the present invention.
Detailed Description
Referring to fig. 1, a method for sorting broken materials of positive and negative electrode plates of a waste lithium ion battery according to a preferred embodiment of the present invention is shown, and the specific process flow includes the following steps:
(1) sending the crushed materials of the positive and negative pole pieces of the waste lithium ion battery into a low-temperature radio frequency plasma ashing instrument, introducing high-purity oxygen, and performing ashing treatment, wherein the set power of the equipment is 20-25 w, and the oxygen flow is 40-50 cm 3 Min, vacuum degree of 0.8-1.0 mbar, temperature of 70-80 deg.C, and maintaining timeThe time is 5 hours. In the process, the binder and other organic components on the surfaces of the particles and between the particles and the copper foil and the aluminum foil are decomposed and removed in a plasma atmosphere, so that the binding force among the components of the material is reduced, and the removal rate of the binder and other organic components is higher than 98%.
(2) The zirconia balls are used as grinding media, and the materials from which the binder and other organic matters are removed are sent into a dry stirring mill for grinding, so that the superfine mixed powder consisting of the anode active material, graphite, copper and aluminum is obtained. In the grinding process, the stirring speed is 250r/min, the ball loading rate is 40%, the grinding time is 30min, and the material dissociation efficiency is higher than 96%.
(3) And (2) feeding the superfine mixed powder discharged by the stirring mill into an ultrasonic vibration sieve for sieving, wherein a single-layer sieve with the sieve surface diameter of 50cm and the sieve pore size of 0.05mm is used as a grading sieve, the ultrasonic vibration frequency is 30kHz, the feeding speed is 2Kg/min, the product with the diameter of 0.05mm is a copper-aluminum particle mixture, and the product with the diameter of 0.05mm is a positive electrode active material and graphite mixture.
(4) And (3) sorting the products with the diameter of +0.05mm in the step (3) by using a pulsating micro-airflow sorting machine to obtain a heavy product copper particle concentrate and a light product aluminum particle concentrate, feeding by using a screw feeder at a feeding speed of 5Kg/min, and obtaining pulsating airflow by using a butterfly valve, wherein the pulsating frequency is 3-5 Hz, the airflow speed is 4-6 cm/s, and the separation efficiency of copper and aluminum particles is higher than 95%.
(5) Carbon tetrachloride and No. 6 solvent oil are used for preparing the solvent oil with the density of 1.2g/cm 3 Mixing the mixed product of the anode powder and the cathode powder with the diameter of-0.05 mm in the step (3) with the heavy liquid, and separating the mixed product by using a centrifugal machine to obtain the light product graphite and the heavy product anode active material, wherein in the process, the concentration of ore pulp is 200g/L, and the rotating speed of the centrifugal machine is 1500 r/min.
(6) And (4) respectively heating the light and heavy products obtained in the step (5), removing residual heavy liquid to obtain pure anode active material powder and graphite powder products, condensing and recovering the organic steam, and reusing the organic steam in the centrifugal separation process. In the process, the heating temperature is 100 ℃, and the condensed reflux heavy liquid is reused.
The method has the key design points that the effective recovery of each valuable component in the crushed materials of the positive and negative pole pieces of the waste lithium ion battery is realized by adopting methods such as plasma low-temperature treatment, dry-method ultrafine crushing, dry-method grading, dry-method sorting, heavy liquid centrifugation and the like according to the physical and chemical properties of the crushed materials of the positive and negative pole pieces of the waste lithium ion battery from the structural characteristics of the crushed materials of the positive and negative pole pieces of the waste lithium ion battery, and the method has the advantages of simple process, low cost, high efficiency and no secondary pollution to the environment.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (7)
1. A sorting method for broken materials of positive and negative pole pieces of a waste lithium ion battery is characterized by mainly comprising the following steps:
step 1, performing plasma ashing on the crushed materials of the positive and negative pole pieces of the waste lithium ion battery at 70-80 ℃ to obtain a material without a binder;
step 2, grinding the material without the binder by using a dry stirring mill to obtain-0.1 mm mixed powder;
step 3, screening the superfine mixed powder by using an ultrasonic vibration screen to obtain a copper-aluminum particle mixture and a positive and negative electrode powder mixture;
step 4, sorting the copper-aluminum mixture by using a pulsating micro-airflow sorting machine to obtain copper particles and aluminum particles;
step 5, preparing heavy liquid, and separating the positive and negative electrode powder mixture by using a centrifugal machine to obtain a light product and a heavy product;
and 6, respectively heating the light and heavy products, and condensing and recycling the organic steam to finally obtain pure positive active materials and pure negative graphite powder.
2. The method for sorting the waste lithium ion battery positive and negative plate broken materials according to claim 1, wherein in the step (1), the waste lithium ion battery positive and negative plate broken materials are subjected to ashing treatment by using a low-temperature radio frequency plasma ashing instrument, the surfaces of particles, adhesives between the particles and copper foil and aluminum foil and other organic components are decomposed, in the process, the equipment is set to have the power of 20-25W, and the oxygen flow is 40-50 cm 3 Min, the vacuum degree is 0.8-1.0 mbar, the temperature is maintained at 70-80 ℃, and the holding time is 5 hours.
3. The method for sorting the crushed materials of the positive and negative pole pieces of the waste lithium ion battery according to claim 1, wherein in the step (2), the materials from which the binder and other organic substances are removed are ground by a dry stirring mill to obtain the ultrafine mixed powder. In the grinding process, the stirring speed is 250r/min, the grinding medium is zirconium oxide, the ball loading rate is 40%, and the treatment time is 30 min.
4. The method for sorting the crushed materials of the positive and negative pole pieces of the waste lithium ion battery according to claim 1, wherein in the step (3), the superfine mixed powder discharged by the stirring mill is sieved by using an ultrasonic vibration sieve to obtain a copper-aluminum particle mixture and a positive and negative pole powder mixture, and in the sieving process, a single-layer sieve is used, the diameter of the sieve surface is 50cm, the size of the sieve pore is 0.05mm, the ultrasonic vibration frequency is 30kHz, and the feeding speed is 2 kg/min.
5. The method for sorting the crushed materials of the positive and negative pole pieces of the waste lithium ion battery as claimed in claim 1, wherein in the step (4), a pulsating micro-airflow sorting machine is used for sorting the copper-aluminum mixture to obtain copper particles and aluminum particles. In the sorting process, the feeding speed is 5kg/min, the pulsation frequency is 3-5 Hz, and the air flow speed is 4-6 cm/s.
6. The method for sorting the crushed materials of the positive and negative pole pieces of the waste lithium ion battery in claim 1, which is characterized in thatCharacterized in that in the step (5), heavy liquid is prepared, and a centrifuge is used for separating the mixture of the anode powder and the cathode powder to obtain a light product and a heavy product. In the separation process, the heavy liquid is prepared by mixing carbon tetrachloride and No. 6 solvent oil, and the density of the heavy liquid is 1.2g/cm 3 The concentration of the ore pulp is 200g/L, and the rotating speed of a centrifugal machine is 1500 r/min.
7. The method for sorting the crushed materials of the positive and negative electrode plates of the waste lithium ion battery according to claim 1, wherein in the step (6), the light and heavy products are respectively heated, and organic steam is condensed and recycled to finally obtain pure positive active materials and pure negative graphite powder. In the process, the heating temperature is 100 ℃, and the condensed and refluxed heavy liquid is reused.
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| CN117046864A (en) * | 2023-08-28 | 2023-11-14 | 国能龙源环保有限公司 | Photovoltaic module recycling method and device |
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| CN107293818A (en) * | 2017-06-08 | 2017-10-24 | 深圳市恒创睿能环保科技有限公司 | A kind of method of copper foil aluminium foil in recovery waste lithium ion |
| 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 |
| CN113426804A (en) * | 2021-06-23 | 2021-09-24 | 上海第二工业大学 | Physical separation and enrichment method for resource components of waste lithium ion battery |
| CN114094224A (en) * | 2022-01-20 | 2022-02-25 | 河北顺境环保科技有限公司 | High-efficiency treatment method for high-voltage waste lithium battery |
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| CN117046864A (en) * | 2023-08-28 | 2023-11-14 | 国能龙源环保有限公司 | Photovoltaic module recycling method and device |
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