CN115637329B - Recovery process of lithium ion battery negative electrode material - Google Patents
Recovery process of lithium ion battery negative electrode material Download PDFInfo
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- CN115637329B CN115637329B CN202211661294.3A CN202211661294A CN115637329B CN 115637329 B CN115637329 B CN 115637329B CN 202211661294 A CN202211661294 A CN 202211661294A CN 115637329 B CN115637329 B CN 115637329B
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- 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
Abstract
The invention discloses a recovery process of a lithium ion battery cathode material, which comprises the following steps: mixing a waste graphite cathode material of a lithium ion battery and refined asphalt, putting the mixture into a kneading machine provided with a heat-insulating sleeve for kneading, wherein the heat-insulating sleeve is connected with a refrigerator, and extruding and separating the materials simultaneously in the kneading process to obtain a mixed material; sieving the mixed material through a screen to obtain oversize material; mixing the oversize material and the organic polymer in a stirring kettle, mixing and stirring, and then carrying out centrifugal separation to obtain a washing material; and (3) placing the washing material in a screen, repeatedly washing the washing material with water until the waste liquid is clear, and then drying the washing material to obtain the high-purity copper metal. The invention can effectively recover the copper metal in the lithium ion battery cathode material, has high recovery efficiency, increases the byproducts of battery recovery, and reduces the waste of resources.
Description
Technical Field
The invention belongs to the technical field of lithium ion battery cathode material recovery, and particularly relates to a recovery process of a lithium ion battery cathode material.
Background
The improvement of resource utilization rate through recycling of various parts of the battery has attracted extensive attention. Currently, much research is focused on recycling high cost cathode materials (e.g., liCoO) 2 、LiFePO 4 Etc.) are extremely small in the recovery of graphite negative electrode materials which are inexpensive and abundant in reserves. When the positive electrode is recovered, the negative electrode is used as a reducing agent or an accessory product, so that the recovery efficiency of the negative electrode is not high, and the loss rate of graphite and copper foil in the negative electrode is high. The method has the advantages that valuable metal copper with high value and high content in the waste battery cathode material is recycled, and the method has very important significance for realizing energy conservation and emission reduction, environmental protection and sustainable development.
The copper source in the graphite cathode material of the retired lithium ion battery mainly comes from a cathode current collector-copper foil, and because the battery-grade copper foil has the characteristic of high purity and is difficult to oxidize in the storage process, the copper in the scrapped graphite powder still exists mainly in the form of elemental copper. The traditional copper recovery process route in the graphite cathode of the retired lithium ion battery is as follows: disassembling a battery, disassembling and selecting an electrode, mechanically grinding a negative plate, and grading to obtain copper powder, wherein the copper powder obtained by the process has poor quality and the purity is generally lower than 99%; moreover, the process has large abrasion to a mechanical grinding machine, and the obtained copper powder contains a large amount of scrap iron generated by equipment abrasion.
The invention patent CN106207301A discloses a method for recovering negative electrode material and copper foil of waste lithium ion battery by electrolysis, which is characterized in that the waste lithium ion battery is disassembled and then taken out of the negative electrode plate, then the negative electrode plate is taken as the anode of the electrolytic cell, the conductive plate is taken as the cathode of the electrolytic cell, meanwhile, a certain content of electrolyte is added into the electrolytic cell, and the copper foil is dissolved by adopting electrification electrolysis and then transferred to the cathode conductive plate, thereby completing the recovery of copper. However, the procedure involves the separation of the negative electrode material from the whole battery core, the design of the procedure will inevitably increase the procedure of sorting the negative electrode material, the requirement on the process is more strict, and further, the production efficiency is reduced, and the procedure is not suitable for real production popularization and application, and the problem is also unexpected because the electrolytic method is used for separating copper, which is only available for the negative electrode and is also a current collector of the negative electrode material, and if the purpose of separating copper is to be achieved, only such measures can be taken.
The invention patent CN107293820A discloses a method for recovering metals from waste lithium ion batteries, which uses an electrode slice made of anode waste as a cathode and an inert electrode as a counter electrode to carry out electrochemical reaction in an acid electrolyte to leach the metals to obtain a solution containing metal ions, thereby completing the recovery of the metals such as copper, nickel, cobalt, manganese and the like. The process involved in this patent is overly complicated, including: the procedures of preparing electrodes, assembling an electrochemical reaction tank, adjusting pH, stirring, centrifuging, adding 1,2,4, 5-benzenetetracarboxylic acid and the like are determined by the essence of the electrochemical reaction.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a process for recovering a negative electrode material of a lithium ion battery, which can avoid the wear of copper metal on equipment during the stripping process of a graphite negative electrode material, and effectively improve the quality of the recovered copper powder.
In order to achieve the purpose, the invention adopts the following technical scheme:
a recovery process of a lithium ion battery negative electrode material comprises the following steps:
s1, mixing the waste graphite cathode material of the lithium ion battery and refined asphalt according to the mass ratio of 10: 1-3, mixing and kneading in a kneading machine provided with a heat-insulating sleeve, wherein the heat-insulating sleeve is connected with a refrigerator, and in the kneading process, materials are simultaneously extruded and separated to obtain a mixed material;
s2, sieving the mixed material obtained in the step S1 through a 200-250-mesh sieve to obtain oversize material;
s3, mixing the oversize material in the step S2 with the organic polymer according to the volume ratio of 1: 3-5, mixing and stirring in a stirring kettle, and then performing centrifugal separation to obtain a washing material;
and S4, placing the washing material obtained in the step S3 into a 300-400-mesh screen, repeatedly washing with water until the waste liquid is clear, and then drying the washing material to obtain the high-purity copper metal.
Further, in the step S1, the waste graphite negative electrode material of the lithium ion battery includes one or more of scrap materials generated in the processing process of the graphite negative electrode plate of the lithium ion battery, a graphite negative electrode plate disassembled from a scrapped battery cell, and a disassembled negative electrode plate of the waste lithium ion battery with a short cycle life.
Further, in the step S1, the softening point of the refined asphalt is 110-150 ℃, and the ash content is less than or equal to 0.1%; the refrigerating temperature of the refrigerating machine is-20-0 ℃, the kneading speed of the kneading machine is 10-20 rpm, and the stripping time is 1-3 h.
In step S3, the organic polymer has a QI (quinoline insoluble) content of 0.1% or less and an aromatic hydrocarbon content of 40% or more.
Further, the organic polymer is a liquid organic polymer having a strong affinity with graphite, including but not limited to residual oil, ethylene tar, and coal tar.
Further, in the step S3, the stirring speed is 30-70 rpm, and the stirring time is 1-3 h; the centrifugal speed is 500-2000 rpm, and the centrifugal time is 3-10 min.
Further, in the step S4, the washed material is dried in an oven at 120-180 ℃ for 2-4 h.
Furthermore, according to the recovery process of the lithium ion battery cathode material, the purity of the obtained metal copper is more than or equal to 99%, the content of Fe is less than or equal to 40ppm, and the recovery rate is more than or equal to 98%.
Due to the adoption of the technical scheme, the invention has the following advantages:
the recovery process of the lithium ion battery cathode material is simple in process flow and easy to operate, a kneader is used as copper foil stripping equipment, and the integrity of the copper foil is ensured as much as possible through a kneading process, so that the separation efficiency of the copper foil and graphite powder is improved, and the purity of the copper foil is improved; in the stripping process, refined asphalt with the softening point of 110-150 ℃ is selected as a stripping medium, and the copper foil in the pole piece can be stripped in a short time through the friction of asphalt powder on the waste graphite pole piece and the rubbing action of the kneader; in order to ensure the friction effect of the asphalt in the kneading process, the kneading temperature is-20-0 ℃, and the asphalt particles are always in a full solid state; the freezing treatment can also utilize the difference of the thermal expansion coefficients of the graphite powder and the copper metal to reduce the adhesive force between the graphite powder and the copper foil and reduce the difficulty of stripping the graphite powder from the copper foil; the asphalt powder can also be used as a buffering agent of a kneading process, so that the abrasion of the copper foil to the kneader equipment is weakened, and the iron content in the copper foil is reduced; through the affinity of the organic polymer and the graphite powder and the rapid stirring process, the residual graphite powder on the copper foil can be thoroughly cleaned, so that the copper metal in the lithium ion battery negative electrode material is effectively recovered, the recovery efficiency is high, the by-products of battery recovery are increased, and the waste of resources is reduced; the recovery process provided by the invention has small abrasion to equipment, so that the content of the introduced Fe is small, the recovery requirement of the lithium ion battery cathode material is met, and the recovery process has good popularization and application values.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to examples.
Example 1
A recovery process of a lithium ion battery negative electrode material comprises the following steps:
s1, mixing the waste graphite negative electrode sheet of the lithium ion battery and refined asphalt in a mass ratio of 10:1, mixing and kneading in a kneading machine provided with a heat-insulating sleeve, wherein the heat-insulating sleeve is connected with a refrigerating machine, and during the kneading process, materials are simultaneously extruded and separated (kneaded and blended) to obtain a mixed material; the softening point of the refined asphalt is 123.7 ℃, and the ash content is 0.02%; the kneading speed is 10rpm, the refrigeration temperature is 0 ℃, and the stripping time is 1h;
s2, sieving the mixed material obtained in the step S1 through a 200-mesh sieve to obtain oversize materials;
s3, mixing the oversize material and the residual oil in the step S2 according to the volume ratio of 1:3, mixing and stirring the mixture in a stirring kettle at the stirring speed of 30rpm for 1h, and then carrying out centrifugal separation to obtain a washing material, wherein the centrifugal speed is 500rpm, and the centrifugal time is 10min; the physical and chemical indexes of the residual oil are QI =0.05%, and the aromatic hydrocarbon content is 57%;
and S4, placing the washing material obtained in the step S3 into a 320-mesh screen, repeatedly washing the washing material with water until the waste liquid is clear, and drying the washing material in an oven at 120 ℃ for 4 hours to obtain the high-purity copper metal.
Example 2
A recovery process of a lithium ion battery negative electrode material comprises the following steps:
s1, mixing the waste graphite negative electrode sheet of the lithium ion battery and refined asphalt in a mass ratio of 10:2, mixing and kneading the mixture in a kneading machine provided with a heat-insulating sleeve, wherein the heat-insulating sleeve is connected with a refrigerating machine, and in the mixing process, the materials are simultaneously extruded and separated (kneaded and blended) to obtain a mixed material; the softening point of the refined asphalt is 123.7 ℃, and the ash content is 0.02%; the kneading speed is 15rpm, the refrigeration temperature is-10 ℃, and the stripping time is 2h;
s2, sieving the mixed material obtained in the step S1 through a 225-mesh sieve to obtain oversize material;
s3, mixing the oversize material and the residual oil in the step S2 according to the volume ratio of 1:4, mixing and stirring in a stirring kettle at a stirring speed of 50rpm for 2 hours, and then performing centrifugal separation to obtain a washing material, wherein the centrifugal speed is 1000rpm, and the centrifugal time is 8min; the physical and chemical indexes of the residual oil are QI =0.05%, and the aromatic hydrocarbon content is 57%;
and S4, placing the washing material obtained in the step S3 into a 320-mesh screen, repeatedly washing the washing material with water until the waste liquid is clear, and drying the washing material in an oven at 150 ℃ for 3 hours to obtain the high-purity copper metal.
Example 3
A recovery process of a lithium ion battery negative electrode material comprises the following steps:
s1, mixing the waste graphite negative electrode sheet of the lithium ion battery and refined asphalt in a mass ratio of 10:3 mixing and kneading the mixture in a kneading machine provided with a heat-insulating sleeve, wherein the heat-insulating sleeve is connected with a refrigerating machine, and during the kneading process, the materials are simultaneously extruded and separated (kneading and blending) to obtain a mixed material; the softening point of the refined asphalt is 123.7 ℃, and the ash content is 0.02%; the kneading speed is 20rpm, the refrigeration temperature is-20 ℃, and the stripping time is 3h;
s2, sieving the mixed material obtained in the step S1 through a 250-mesh sieve to obtain oversize materials;
s3, mixing the oversize material and the residual oil in the step S2 according to the volume ratio of 1:5, mixing the materials in a stirring kettle, stirring at the stirring speed of 70rpm for 3 hours, and then performing centrifugal separation to obtain a washing material, wherein the centrifugal speed is 1500rpm, and the centrifugal time is 5min; the physical and chemical indexes of the residual oil are QI =0.05%, and the aromatic hydrocarbon content is 57%;
and S4, placing the washing material obtained in the step S3 into a 400-mesh screen, repeatedly washing with water until the waste liquid is clear, and drying the washing material in an oven at 180 ℃ for 2 hours to obtain the high-purity copper metal.
Example 4
A recovery process of a lithium ion battery negative electrode material comprises the following steps:
s1, mixing the waste graphite negative electrode sheet of the lithium ion battery and refined asphalt according to the mass ratio of 10:1, mixing and kneading in a kneading machine provided with a heat-insulating sleeve, wherein the heat-insulating sleeve is connected with a refrigerating machine, and during the kneading process, materials are simultaneously extruded and separated (kneading and blending) to obtain a mixed material; the softening point of the refined asphalt is 123.7 ℃, and the ash content is 0.02%; the kneading speed is 10rpm, the refrigeration temperature is 0 ℃, and the stripping time is 1h;
s2, sieving the mixed material obtained in the step S1 through a 200-mesh sieve to obtain oversize material;
s3, mixing the oversize material obtained in the step S2 with ethylene tar according to the volume ratio of 1:3, mixing and stirring in a stirring kettle at the stirring speed of 30rpm for 1h, and then performing centrifugal separation to obtain a washing material, wherein the centrifugal speed is 1000rpm, and the centrifugal time is 8min; the physical and chemical indexes of the ethylene tar are QI = ND, and the aromatic hydrocarbon content is 42%;
and S4, placing the washing material obtained in the step S3 in a 300-mesh screen, repeatedly washing with water until waste liquid is clear, and drying the washing material in an oven at the temperature of 120 ℃ for 4 hours to obtain the high-purity copper metal.
Example 5
A recovery process of a lithium ion battery negative electrode material comprises the following steps:
s1, mixing the waste graphite negative electrode sheet of the lithium ion battery and refined asphalt in a mass ratio of 10:1, mixing and kneading in a kneading machine provided with a heat-insulating sleeve, wherein the heat-insulating sleeve is connected with a refrigerating machine, and during the kneading process, materials are simultaneously extruded and separated (kneading and blending) to obtain a mixed material; the softening point of the refined asphalt is 123.7 ℃, and the ash content is 0.02%; the kneading speed is 10rpm, the refrigeration temperature is 0 ℃, and the stripping time is 1h;
s2, sieving the mixed material obtained in the step S1 through a 200-mesh sieve to obtain oversize material;
s3, mixing the oversize material obtained in the step S2 with the coal tar according to the volume ratio of 1:3, mixing and stirring the mixture in a stirring kettle at the stirring speed of 30rpm for 1h, and then carrying out centrifugal separation to obtain a washing material, wherein the centrifugal rotation speed is 1000rpm, and the centrifugal time is 8min; the physicochemical indexes of the coal tar are QI =0.07%, and the aromatic hydrocarbon content is 81%;
and S4, placing the washing material obtained in the step S3 into a 300-mesh screen, repeatedly washing with water until the waste liquid is clear, and drying the washing material in an oven at 120 ℃ for 4 hours to obtain the high-purity copper metal.
Example 6
A recovery process of a lithium ion battery negative electrode material comprises the following steps:
s1, mixing the waste graphite negative electrode sheet of the lithium ion battery and refined asphalt according to the mass ratio of 10:1, mixing and kneading in a kneading machine provided with a heat-insulating sleeve, wherein the heat-insulating sleeve is connected with a refrigerating machine, and during the kneading process, materials are simultaneously extruded and separated (kneaded and blended) to obtain a mixed material; the refined asphalt has a softening point of 112.5 ℃ and ash content of 0.05%; the kneading speed is 15rpm, the refrigeration temperature is-10 ℃, and the stripping time is 1h;
s2, sieving the mixed material obtained in the step S1 through a 200-mesh sieve to obtain oversize materials;
s3, mixing the oversize material and the residual oil in the step S2 according to the volume ratio of 1:3, mixing and stirring the mixture in a stirring kettle at the stirring speed of 30rpm for 2 hours, and then carrying out centrifugal separation to obtain a washing material, wherein the centrifugal rotation speed is 800rpm, and the centrifugal time is 10min; the physical and chemical indexes of the residual oil are QI =0.05%, and the aromatic hydrocarbon content is 57%;
and S4, placing the washing material obtained in the step S3 into a 320-mesh screen, repeatedly washing the washing material with water until the waste liquid is clear, and drying the washing material in an oven at 120 ℃ for 4 hours to obtain the high-purity copper metal.
Example 7
A recovery process of a lithium ion battery negative electrode material comprises the following steps:
s1, mixing the waste graphite negative electrode sheet of the lithium ion battery and refined asphalt according to the mass ratio of 10:1, mixing and kneading in a kneading machine provided with a heat-insulating sleeve, wherein the heat-insulating sleeve is connected with a refrigerating machine, and during the kneading process, materials are simultaneously extruded and separated (kneading and blending) to obtain a mixed material; the refined asphalt has a softening point of 112.5 ℃ and ash content of 0.05%; the kneading speed is 10rpm, the refrigeration temperature is 0 ℃, and the stripping time is 2h;
s2, sieving the mixed material obtained in the step S1 through a 220-mesh sieve to obtain oversize materials;
s3, mixing the oversize material obtained in the step S2 with ethylene tar according to the volume ratio of 1:4, mixing and stirring the mixture in a stirring kettle at the stirring speed of 50rpm for 1.5h, and then carrying out centrifugal separation to obtain a washing material, wherein the centrifugal rotation speed is 1000rpm, and the centrifugal time is 5min; the physical and chemical indexes of the ethylene tar are QI = ND, and the aromatic hydrocarbon content is 42%;
and S4, placing the washing material obtained in the step S3 into a 350-mesh screen, repeatedly washing with water until the waste liquid is clear, and drying the washing material in an oven at 180 ℃ for 2 hours to obtain the high-purity copper metal.
Example 8
A recovery process of a lithium ion battery negative electrode material comprises the following steps:
s1, mixing the waste graphite negative electrode sheet of the lithium ion battery and refined asphalt in a mass ratio of 10:1, mixing and kneading in a kneading machine provided with a heat-insulating sleeve, wherein the heat-insulating sleeve is connected with a refrigerating machine, and during the kneading process, materials are simultaneously extruded and separated (kneading and blending) to obtain a mixed material; the softening point of the refined asphalt is 145.8 ℃, and the ash content is 0.07%; the kneading speed is 10rpm, the refrigeration temperature is 0 ℃, and the stripping time is 1h;
s2, sieving the mixed material obtained in the step S1 through a 200-mesh sieve to obtain oversize material;
s3, mixing the oversize material and the residual oil in the step S2 according to the volume ratio of 1:3, mixing and stirring in a stirring kettle at the stirring speed of 30rpm for 1h, and then performing centrifugal separation to obtain a washing material, wherein the centrifugal speed is 500rpm, and the centrifugal time is 10min; the physical and chemical indexes of the residual oil are QI =0.05%, and the aromatic hydrocarbon content is 57%;
and S4, placing the washing material obtained in the step S3 into a 320-mesh screen, repeatedly washing the washing material with water until the waste liquid is clear, and drying the washing material in an oven at 120 ℃ for 4 hours to obtain the high-purity copper metal.
Example 9
A recovery process of a lithium ion battery negative electrode material comprises the following steps:
s1, mixing the waste graphite negative electrode sheet of the lithium ion battery and refined asphalt according to the mass ratio of 10:1, mixing and kneading in a kneading machine provided with a heat-insulating sleeve, wherein the heat-insulating sleeve is connected with a refrigerating machine, and during the kneading process, materials are simultaneously extruded and separated (kneading and blending) to obtain a mixed material; the softening point of the refined asphalt is 145.8 ℃, and the ash content is 0.07%; the kneading speed is 20rpm, the refrigeration temperature is-20 ℃, and the stripping time is 3h;
s2, sieving the mixed material obtained in the step S1 through a 250-mesh sieve to obtain oversize material;
s3, mixing the oversize material obtained in the step S2 with coal tar according to the volume ratio of 1:5, mixing the materials in a stirring kettle, stirring at the stirring speed of 70rpm for 1h, and then performing centrifugal separation to obtain a washing material, wherein the centrifugal speed is 1500rpm, and the centrifugal time is 5min; the physicochemical indexes of the coal tar are QI =0.07%, and the aromatic hydrocarbon content is 81%;
and S4, placing the washing material obtained in the step S3 in a 400-mesh screen, repeatedly washing with water until waste liquid is clear, and drying the washing material in an oven at 180 ℃ for 2 hours to obtain the high-purity copper metal.
In the above-mentioned embodiments 1 to 8, the used waste graphite negative electrode sheet of the lithium ion battery is a graphite negative electrode sheet disassembled from a scrapped battery cell.
Comparative example
The commercial copper powder belongs to the copper powder recovered by the traditional mechanical grinding method.
Test example
The copper metal obtained by the recovery process of the above examples 1 to 9 and the copper powder in the comparative example were subjected to physical and chemical index tests, and the specific test results are shown in table 1.
TABLE 1 Performance parameters of examples 1 to 9 and comparative examples
From the examples 1 to 9, the recovery process of the lithium ion battery cathode material can obtain copper metal with the purity of more than or equal to 99 percent, the recovery rate of the copper metal is more than or equal to 98 percent, and the content of Fe is less than or equal to 40ppm; the higher the refined pitch softening point, the higher the copper metal recovery.
From examples 1 to 3, it is seen that the reaction conditions and parameters of the recovery process of the lithium ion battery negative electrode material of the present invention can affect the yield and Fe content of the recovered copper metal, and have little effect on the purity.
From examples 1, 4 and 5, it can be seen that the aromatic content of the organic polymer affects the purity and Fe content of the recovered copper metal with little effect on the yield.
The commercial copper powder is selected as a comparative example, and belongs to the copper powder recovered by the traditional mechanical grinding method; compared with each embodiment of the invention, the purity and the yield are low, and the content of Fe is obviously higher.
According to the above embodiments and test examples, it can be confirmed that the recovery process of the lithium ion battery negative electrode material of the present invention is a new process for recovering copper metal mildly and effectively; in addition, the aromatic content of the organic polymer has a large influence on the washing effect of copper.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all equivalent changes and modifications made in the claims of the present invention should fall within the protection scope of the present invention.
Claims (7)
1. A recovery process of a lithium ion battery cathode material is characterized by comprising the following steps: which comprises the following steps:
s1, mixing the waste graphite cathode material of the lithium ion battery and refined asphalt according to the mass ratio of 10: 1-3, mixing and kneading in a kneading machine provided with a heat-insulating sleeve, wherein the heat-insulating sleeve is connected with a refrigerator, and in the mixing and kneading process, materials are simultaneously extruded and separated to obtain a mixed material;
s2, sieving the mixed material obtained in the step S1 through a 200-250-mesh sieve to obtain oversize material;
s3, mixing the oversize material obtained in the step S2 with one of residual oil, ethylene tar and coal tar in a volume ratio of 1: 3-5, mixing and stirring in a stirring kettle, and then performing centrifugal separation to obtain a washing material;
and S4, placing the washing material obtained in the step S3 into a 300-400-mesh screen, repeatedly washing with water until the waste liquid is clear, and then drying the washing material to obtain the high-purity copper metal.
2. The recovery process of the negative electrode material of the lithium ion battery as claimed in claim 1, wherein: in the step S1, the waste graphite negative electrode material of the lithium ion battery includes one or more of scrap material generated in the processing process of the graphite negative electrode plate of the lithium ion battery, a graphite negative electrode plate disassembled from a scrapped battery cell, and a disassembled negative electrode plate of the waste lithium ion battery with a short cycle life.
3. The recovery process of the negative electrode material of the lithium ion battery as claimed in claim 1, wherein: in the step S1, the softening point of the refined asphalt is 110-150 ℃, and the ash content is less than or equal to 0.1%; the refrigerating temperature of the refrigerating machine is-20-0 ℃, the kneading speed of the kneading machine is 10-20 rpm, and the stripping time is 1-3 h.
4. The recovery process of the lithium ion battery negative electrode material according to claim 1, characterized in that: in step S3, the residual oil, the ethylene tar or the coal tar has a QI content of less than or equal to 0.1% and an aromatic hydrocarbon content of more than or equal to 40%.
5. The recovery process of the negative electrode material of the lithium ion battery as claimed in claim 1, wherein: in the step S3, the stirring speed is 30-70 rpm, and the stirring time is 1-3 h; the centrifugal speed is 500-2000 rpm, and the centrifugal time is 3-10 min.
6. The recovery process of the negative electrode material of the lithium ion battery as claimed in claim 1, wherein: in the step S4, the washed material is dried in an oven at 120-180 ℃ for 2-4 h.
7. The recovery process of the negative electrode material of the lithium ion battery as claimed in claim 1, wherein: according to the recovery process of the lithium ion battery cathode material, the purity of the obtained metal copper is more than or equal to 99%, the content of Fe is less than or equal to 40ppm, and the recovery rate is more than or equal to 98%.
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| CN100449011C (en) * | 2007-05-18 | 2009-01-07 | 北京矿冶研究总院 | Method for recovering valuable metal in invalid lithium ion battery |
| CN102005559B (en) * | 2009-09-01 | 2013-06-05 | 天津爱敏特电池材料有限公司 | Method for preparing artificial graphite cathode material for lithium ion batteries |
| CN101710632B (en) * | 2009-12-18 | 2012-05-02 | 湖南邦普循环科技有限公司 | Method for recovering and restoring anode material graphite of waste lithium ion battery |
| KR101708360B1 (en) * | 2011-10-05 | 2017-02-21 | 삼성에스디아이 주식회사 | Negative active material and lithium battery containing the material |
| JP5657730B2 (en) * | 2013-03-29 | 2015-01-21 | Jx日鉱日石金属株式会社 | Method for recovering valuable materials from lithium-ion batteries |
| CN104779372A (en) * | 2015-04-24 | 2015-07-15 | 深圳市斯诺实业发展有限公司 | Cyclic utilization method for using graphite fine powder as negative pole material of lithium-ion batteries |
| CN106129522A (en) * | 2016-08-31 | 2016-11-16 | 合肥国轩高科动力能源有限公司 | A kind of preparation method utilizing lithium ion battery negative to reclaim graphite |
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