CN115367906A - Method for recovering NMP cleaning waste liquid of lithium battery - Google Patents
Method for recovering NMP cleaning waste liquid of lithium battery Download PDFInfo
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- CN115367906A CN115367906A CN202210787310.7A CN202210787310A CN115367906A CN 115367906 A CN115367906 A CN 115367906A CN 202210787310 A CN202210787310 A CN 202210787310A CN 115367906 A CN115367906 A CN 115367906A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D207/00—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom
- C07D207/02—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D207/18—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having one double bond between ring members or between a ring member and a non-ring member
- C07D207/22—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having one double bond between ring members or between a ring member and a non-ring member with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D207/24—Oxygen or sulfur atoms
- C07D207/26—2-Pyrrolidones
- C07D207/263—2-Pyrrolidones with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to other ring carbon atoms
- C07D207/267—2-Pyrrolidones with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to other ring carbon atoms with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to the ring nitrogen atom
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/44—Time
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- 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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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Inorganic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a method for recovering a lithium battery NMP cleaning waste liquid, which comprises the steps of preparation of a flocculation solution, flocculation of the NMP waste liquid and solid-liquid separation. The flocculation solution can flocculate the conductive agent and the main material in the NMP cleaning waste liquid, and clear NMP is extracted from the NMP cleaning waste liquid through solid-liquid separation, wherein the extracted NMP contains a small amount of water and partial salt substances, and the original NMP is not deteriorated and does not influence the purification of a chemical plant. The method has the advantages of simple process flow and low cost, and can be used as pretreatment for preparing high-purity NMP in a chemical plant.
Description
Technical Field
The invention relates to the technical field of lithium batteries, relates to NMP cleaning waste liquid, and particularly relates to a method for recovering the NMP cleaning waste liquid of a lithium battery.
Background
NMP (N-methyl pyrrolidone) is a colorless transparent liquid, has good chemical stability and thermal stability, high polarity and low volatility, can be infinitely mixed with water and a plurality of organic solvents, and is one of the most common and very important lithium ion battery auxiliary materials. The solvent which is commonly used in the process of proportioning at the front section of the lithium ion battery is used as a PVDF solvent to participate in slurry dispersion to form slurry which is uniform in medium and stable for a long time in a certain viscosity range, the slurry is used as a main liquid carrier of the slurry in a coating stage, and NMP (N-methyl pyrrolidone) plays a role in pore forming in a coating and baking stage. In addition, NMP is a relatively good polar solvent and is often used as a cleaning agent, especially in the production of lithium ion batteries and in cleaning agents for printed circuit boards and electronic devices.
NMP is used as a lithium ion battery electrolyte solvent, the purity of the NMP has a large influence on the performance of a lithium ion battery in the using process, as is well known, the NMP has an industrial grade product and an electronic grade product, the purity quality of the NMP has a large influence on the electrolyte and the performance of the lithium ion battery, and the charge-discharge, cycle efficiency, reversible specific capacity and other performances of the lithium ion battery can be influenced if the purity quality of the NMP is low (if the non-soluble separation reaction of PVDF during dispersion can be directly caused, the PVDF is separated out, the stability and dispersion effect of slurry are influenced, the electrochemical performance is reduced due to the reaction with lithium, safety problems occur and the like), and the improvement of the purity quality by 0.01% has a large influence on the improvement of the overall performance of the lithium ion battery. NMP is produced by conventional rectification, but the quality and purity of NMP can be improved to a certain extent by the conventional NMP rectification, and on the basis, certain contents of impurities still exist, such as water (NMP is easy to absorb water), GBL, homologues of NMP and the like, and the impurities have similar boiling points with the NMP, so that the impurities cannot be separated by a conventional mode of increasing a rectifying tower and the like, and the purification difficulty is very high on the basis, particularly the preparation of production electronic grade (99.99%) NMP, and the requirements on system and process design are a serious challenge.
In the production process of the lithium battery, when models or materials are switched or the cleaning is carried out regularly, the pipelines, the die heads, the dispersion kettles, the stirring tanks and the like are cleaned by NMP, the NMP cleaning waste liquid mainly contains solids such as lithium iron phosphate, a conductive agent, a binder, a dispersing agent and the like, and is different from the NMP cleaning waste liquid collected in the recovery tower, so that the solids are generally sold to a treatment plant at an extremely low price (waste material) in a lithium battery enterprise, a large amount of resource waste is caused, and the load and difficulty of subsequent sewage treatment are increased.
Disclosure of Invention
In order to solve the problems, the invention provides a method for recovering the NMP cleaning waste liquid of the lithium battery, no new substance is introduced, the solid content range of the NMP cleaning waste liquid is wide, the purity of the extracted NMP is high, the process flow is simple, the cost is low, and the method can be used as the pretreatment for preparing high-purity NMP in a chemical plant.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for recovering a lithium battery NMP cleaning waste liquid comprises the following steps:
1) Preparing a flocculation solution: adding a flocculating agent into water, adjusting the pH value, and uniformly stirring to obtain a flocculating solution;
2) Flocculation of NMP cleaning waste liquid: adding the flocculation solution obtained in the step 1) into NMP cleaning waste liquid in batches, and stirring for a period of time;
3) Solid-liquid separation: and 2) carrying out solid-liquid separation on the flocculated waste liquid, and filtering and purifying the filtrate to obtain an NMP aqueous solution.
In the invention, the flocculant adopted by the invention can realize that no new substances are introduced, so that the solid content range of the NMP cleaning waste liquid treated by the invention is wider and covers 0-30%.
The NMP solution recovered by the method has high purity which can reach 80 percent, and the extraction rate is high.
As a preferred scheme of the present invention, in step 1), water is deionized water, and the mass ratio of the deionized water to the flocculant is: 20, adjusting the pH value to 6.0-8.0, and stirring for 0.5-4h.
As a preferable scheme of the invention, in the step 2), the adding amount of the flocculation solution is 0.1-0.4 time of the quality of the NMP cleaning waste liquid, and the stirring time is 0.5-4h.
As a preferable scheme of the invention, in the step 1) and the step 2), the stirring speed is 0-500r/min, and the linear speed is less than or equal to 5m/min.
As a preferable scheme of the invention, the solid-liquid separation comprises at least one or more of filter pressing, disc sheet net filtration, scraper filtration, pipeline filtration or disposable filter filtration.
As a preferable scheme of the invention, the solid content of the NMP clear solution waste liquid is 0-30%.
As a preferred embodiment of the present invention, the steps 2) and 3) can be repeated several times.
As a preferable scheme of the invention, the flocculating agent is selected from at least one or more of polyaluminium chloride, polyferric sulfate, polyaluminium ferric silicate, aluminium sulfate, alum, aluminium potassium sulfate, potassium ferrate, ferric chloride, ferrous sulfate, magnesium chloride, calcium chloride, magnesium aluminium silicate or ferrous chloride.
In a preferable embodiment of the present invention, the solid-liquid separation is performed by pressure filtration using a filter press, and the mesh number of the filter cloth used in the filter press is 300 to 1000.
In a preferable embodiment of the present invention, in the step 3), the mesh number of the filter is 0.1 to 50 μm in the filtration purification.
Compared with the prior art, the invention has the following beneficial effects:
1) The preparation method of the flocculation solution is simple, the operation is simple, no special requirements are required on equipment, and a common lithium power plant is provided with a filter press for water treatment, so that the method is easy to industrialize;
2) The flocculant adopted by the invention can realize that no new substance is introduced, and the range of solid content of the treated NMP is wider and covers 0-30%;
3) The purity of NMP extracted by the method is high and can reach 80%, and the extraction rate is also high and reaches 80%;
4) Compared with the original waste liquid, the price of the NMP separated by the method can be increased by 7 times; meanwhile, the solid separation material mainly contains lithium iron phosphate and a conductive agent, and can be supplied to a lithium battery recovery plant and is increased to 2 times of the original waste liquid.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The raw materials used in the present invention are all commercially available.
Example 1
The embodiment provides a method for recovering a lithium battery NMP cleaning waste liquid, which comprises the following steps:
(1) Adding 200kg of deionized water into a stirring tank, adding 10kg of polyaluminum chloride under the condition of low-speed stirring, adjusting the pH value to 6, and stirring at low speed for 0.5h to obtain a flocculation solution; wherein: the low-speed stirring speed is 25r/min, and the linear speed is less than or equal to 5m/min.
(2) Adding 500kg of NMP cleaning waste liquid into a stirring tank, adding 200kg of flocculating solution in batches, and stirring at a low speed for 0.5h; wherein: the solid content of the NMP cleaning waste liquid is 0-30%, the low-speed stirring speed is 25r/min, and the linear speed is less than or equal to 5m/min.
(3) And pressing the flocculated NMP waste liquid into a filter press by using power, and filtering and purifying the filtrate by using a disposable filter to obtain a clear NMP aqueous solution. Wherein: the material of the filter press cloth of the filter press is corrosion-resistant, such as terylene material, the mesh number is 1000 meshes, and the particle size of the filter is 1 mu m.
Example 2
The embodiment provides a method for recovering a lithium battery NMP cleaning waste liquid, which comprises the following steps:
(1) Adding 200kg of deionized water into a stirring tank, adding 50kg of polyaluminum chloride under the condition of low-speed stirring, adding alkali, adjusting the pH value to 6.5, and stirring at low speed for 4 hours to obtain a flocculation solution, wherein: the low-speed stirring speed is 50r/min, and the linear speed is less than or equal to 5m/min.
(2) Adding 500kg of NMP cleaning waste liquid into a stirring tank, adding 50kg of flocculating solution in batches, and stirring at a low speed for 4 hours; wherein: the solid content of the NMP cleaning waste liquid is 0-30%, the low-speed stirring speed is 75r/min, and the linear speed is less than or equal to 5m/min.
(3) And pressing the flocculated NMP waste liquid into a filter press by using a diaphragm pump to obtain NMP filtrate. Wherein: the filter press cloth of the filter press is made of terylene with 1000 meshes and a 1 mu m mesh of a purifying filter.
(4) Adding the filtrate obtained in the step (3) into a stirring tank, adding 10kg of flocculation solution in batches, and stirring at a low speed for 4 hours; wherein: the low-speed stirring speed is 75r/min, and the linear speed is less than or equal to 5m/min.
(5) And pressing the NMP filtrate subjected to the secondary flocculation treatment into a filter press by using power, and filtering and purifying the filtrate to obtain a clear NMP aqueous solution. Wherein: the purification filter is corrosion resistant and has the precision of 1 mu m.
Example 3
The embodiment provides a method for recovering a lithium battery NMP cleaning waste liquid, which comprises the following steps:
(1) Adding 200kg of deionized water into a stirring tank, adding 10kg of ferric trichloride under the condition of low-speed stirring, adjusting the pH value to 8, and stirring at low speed for 4 hours to obtain a flocculation solution, wherein: the low-speed stirring speed is 100r/min, and the linear speed is less than or equal to 5m/min.
(2) Adding 500kg of NMP cleaning waste liquid into a stirring tank, adding 100kg of flocculating solution in batches, and stirring at a low speed for 2 hours; wherein: the solid content of the NMP cleaning waste liquid is 0-30%, the low-speed stirring speed is 75r/min, and the linear speed is less than or equal to 5m/min;
(3) And pressing the flocculated NMP waste liquid into a filter press by using power, and filtering and purifying the filtrate to obtain a clear NMP aqueous solution. Wherein: the filter press cloth of the filter press is made of terylene, the mesh number is 1000 meshes, and the purifying filter is 1 mu m.
Example 4
The embodiment provides a method for recovering a lithium battery NMP cleaning waste liquid, which comprises the following steps:
(1) Adding 200kg of deionized water into a stirring tank, adding 30kg of polyaluminum chloride under the condition of low-speed stirring, adjusting the pH value to 6, and stirring at low speed for 3 hours to obtain a flocculation solution, wherein: the low-speed stirring speed is 15r/min, and the linear speed is less than or equal to 5m/min.
(2) Adding 500kg of NMP cleaning waste liquid into a stirring tank, adding 75kg of flocculating solution in batches, and stirring at a low speed for 2 hours; wherein: the solid content of the NMP cleaning waste liquid is 0-30%, the low-speed stirring speed is 55r/min, and the linear speed is less than or equal to 5m/min.
(3) And filtering the flocculated NMP waste liquid by using a vibrating screen, and filtering and purifying the filtrate to obtain a clear NMP aqueous solution. Wherein: the filter screen of the vibration sieve is made of stainless steel, the mesh number is 150, and the purifying filter is 1 mu m.
Example 5
The embodiment provides a method for recovering a lithium battery NMP cleaning waste liquid, which comprises the following steps:
(1) Adding 200kg of deionized water into a stirring tank, adding 20kg of polyaluminum chloride and 10kg of ferric chloride under the condition of low-speed stirring, adjusting the pH value to 7, and stirring at low speed for 3 hours to obtain a flocculation solution, wherein: the low-speed stirring speed is 100r/min, and the linear speed is less than or equal to 5m/min.
(2) Adding 500kg of NMP cleaning waste liquid into a stirring tank, adding 150kg of flocculating solution in batches, and stirring at a low speed for 2.5 hours; wherein: the solid content of the NMP cleaning waste liquid is 0-30%, the low-speed stirring speed is 65r/min, and the linear speed is less than or equal to 5m/min.
(3) And pressing the flocculated NMP waste liquid into a filter press by using power, and filtering and purifying the filtrate to obtain a clear NMP aqueous solution. Wherein: the filter press cloth of the filter press is made of terylene, the mesh number is 1000 meshes, and the purifying filter is 1 mu m.
Comparative example 1 (floc high speed agitation):
the difference between the comparative example 1 and the embodiment 1 is that the flocculating constituent is prepared by high-speed stirring, the stirring speed is 1000r/min, the linear speed is more than or equal to 5m/min, and the rest is the same.
Comparative example 2 (first step of solid-liquid separation directly using low solids containing filter)
Comparative example 2 is different from example 1 in that, in the solid-liquid separation, filtration was performed using a disposable filter.
Comparative example 3 (non-flocculated, direct solid-liquid separation)
Comparative example 3 differs from example 1 in that it was not flocculated and was filtered by direct pressure filtration, the rest being identical.
Using examples 1 to 5 and comparative examples 1 to 3, respectively, the conditions of treating NMP cleaning waste liquid were compared as shown in Table 1:
table 1. Test results:
| extracting the index | Solid-liquid separation | Purity of | Extraction rate |
| Example 1 | Non-blocking net | 83％ | 81.8％ |
| Example 2 | Non-blocking net | 82.6％ | 81.6％ |
| Example 3 | Non-blocking net | 82.1％ | 82.1％ |
| Example 4 | Non-blocking net | 81.8％ | 80.8％ |
| Example 5 | Non-blocking net | 82.3％ | 81.3％ |
| Comparative example 1 | Non-blocking net | 60.5％ | 60.5％ |
| Comparative example 2 | Plugging net | / | 0％ |
| Comparative example 3 | Non-blocking net | / | 0％ |
As can be seen from Table 1, by comparing the data of comparative example 1 and examples 1 to 5, it can be seen that the purity of NMP extracted by the method of the present invention is high and the solid-liquid extraction rate of NMP is also high; as can be seen by comparing the data of comparative example 2 and examples 1 to 5, the method of the present invention has a large treatment capacity and does not block the net during solid-liquid separation; as can be seen by comparing the data of comparative example 3 and examples 1 to 5, the solid and NMP can be rapidly separated during solid-liquid separation by adopting the method of the invention, and the value of the NMP and the solid can be commonly embodied.
While the invention has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that the foregoing and other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention. Those skilled in the art can make various changes, modifications and equivalent arrangements, which are equivalent to the embodiments of the present invention, without departing from the spirit and scope of the present invention, and which may be made by utilizing the techniques disclosed above; meanwhile, any changes, modifications and variations of the above-described embodiments, which are equivalent to those of the technical spirit of the present invention, are within the scope of the technical solution of the present invention.
Claims (10)
1. A recovery method of a lithium battery NMP cleaning waste liquid is characterized by comprising the following steps:
1) Preparing a flocculation solution: adding a flocculating agent into water, adjusting the pH value, and uniformly stirring to obtain a flocculating solution;
2) Flocculation of NMP cleaning waste liquid: adding the flocculation solution obtained in the step 1) into NMP cleaning waste liquid in batches, and stirring for a period of time;
3) Solid-liquid separation: and 2) carrying out solid-liquid separation on the flocculated waste liquid, and filtering and purifying the filtrate to obtain an NMP aqueous solution.
2. The method for recovering the lithium battery NMP cleaning waste liquid according to claim 1, wherein in the step 1), the water is deionized water, and the mass ratio of the deionized water to the flocculating agent is as follows: 20, adjusting the pH value to 6.0-8.0, and stirring for 0.5-4h.
3. The method for recovering the lithium battery NMP cleaning waste liquid according to claim 1, wherein in the step 2), the addition amount of the flocculation solution is 0.1-0.4 times of the mass of the NMP cleaning waste liquid, and the stirring time is 0.5-4h.
4. The method for recovering the lithium battery NMP cleaning waste liquid according to claim 1, wherein in the step 1) and the step 2), the stirring speed is 0-500r/min, and the linear speed is less than or equal to 5m/min.
5. The method for recovering the lithium battery NMP cleaning waste liquid according to claim 1, wherein the solid-liquid separation comprises at least one or more of filter pressing, disc sheet net filtering, scraper filtering, pipeline filtering or disposable filter filtering.
6. The method for recovering the waste liquid of the lithium battery NMP cleaning solution as recited in claim 1, wherein the solid content of the waste liquid of the NMP clear solution is 0-30%.
7. The method for recovering the lithium battery NMP cleaning waste liquid according to claim 1, wherein the steps 2) and 3) can be repeated for a plurality of times.
8. The method for recovering the waste liquid from the lithium battery NMP cleaning process as claimed in any one of claims 1 to 7, wherein the flocculating agent is selected from at least one or more of polyaluminium chloride, polyferric sulfate, polyaluminium ferric silicate, aluminium sulfate, alum, aluminium potassium sulfate, potassium ferrate, ferric chloride, ferrous sulfate, magnesium chloride, calcium chloride, magnesium aluminium silicate or ferrous chloride.
9. The method for recovering the lithium battery NMP cleaning waste liquid according to claim 5, wherein the solid-liquid separation adopts a filter press, and the filter cloth used by the filter press has 300-1000 meshes.
10. The method for recovering a lithium battery NMP cleaning waste liquid according to claim 1, wherein in the step 3), the mesh number of the filter is 0.1-50 μm during the filtration and purification.
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| CN102544627A (en) * | 2010-12-29 | 2012-07-04 | 比亚迪股份有限公司 | Method for recycling N-methyl-2-pyrrolidone from lithium battery electrode material |
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| CN111018768A (en) * | 2019-04-01 | 2020-04-17 | 赣州中能实业有限公司 | Recovery method of N-methyl pyrrolidone |
| KR102109401B1 (en) * | 2019-07-08 | 2020-05-12 | 재원산업 주식회사 | METHOD FOR PURYFING WASTED SOLUTION COMPRISING N-methyl-2-pyrrolidone |
| CN113690502A (en) * | 2021-07-23 | 2021-11-23 | 广东邦普循环科技有限公司 | Method for recycling waste battery slurry |
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2022
- 2022-07-04 CN CN202210787310.7A patent/CN115367906A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102544627A (en) * | 2010-12-29 | 2012-07-04 | 比亚迪股份有限公司 | Method for recycling N-methyl-2-pyrrolidone from lithium battery electrode material |
| CN111018768A (en) * | 2019-04-01 | 2020-04-17 | 赣州中能实业有限公司 | Recovery method of N-methyl pyrrolidone |
| KR102109401B1 (en) * | 2019-07-08 | 2020-05-12 | 재원산업 주식회사 | METHOD FOR PURYFING WASTED SOLUTION COMPRISING N-methyl-2-pyrrolidone |
| CN110436592A (en) * | 2019-08-16 | 2019-11-12 | 金为环保科技(常州)有限公司 | A kind of processing method of lithium cell cathode waste liquid |
| CN110436593A (en) * | 2019-08-16 | 2019-11-12 | 金为环保科技(常州)有限公司 | A method of N methyl pyrrolidone in recycling Anode of lithium cell waste liquid |
| CN113690502A (en) * | 2021-07-23 | 2021-11-23 | 广东邦普循环科技有限公司 | Method for recycling waste battery slurry |
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