System for firstly pulverizing and then pyrolyzing and recycling positive pole piece

Abstract

The invention discloses a system for firstly pulverizing and then pyrolyzing and recovering a positive pole piece. The system comprises a conveyor; the crushing system is connected with the conveyor; the screening device is connected with the crushing system; a first sending cabin; a third vacuum conveying system; a second sending cabin; a first vacuum delivery system; an aluminum bin; the black powder trapping system is connected with the crushing system; the third sending bin and the fourth sending bin are connected with the black powder trapping system; the black powder temporary storage bin is communicated with the third vacuum conveying system; the pyrolysis system is connected with the black powder temporary storage bin; a second vacuum conveying system; the tail gas flying dust treatment system is connected with the pyrolysis system; a fifth sending bin; a sixth sending bin; a material processing system; a fourth vacuum conveying system; and a black powder bin. Compared with the prior art, the technical scheme provided by the invention has the advantages that the pyrolysis efficiency can be improved, the energy consumption can be reduced, and the pole piece material recovery rate and the product purity can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery material recycling, and more specifically, to a positive electrode plate powdering and then pyrolysis recovery system. Background Art

[0002] Lithium batteries have the characteristics of high energy density, long cycle life, safety and environmental protection. They are widely used in production and life. From small electronic devices such as Bluetooth headsets to large energy storage systems such as power station energy storage, lithium batteries are indispensable. In the production process of lithium batteries, a large number of pole pieces and unqualified pole pieces are generated. These scraps and unqualified materials not only take up a lot of storage space, but also are a valuable resource library. Therefore, battery pole piece recycling is of great significance.

[0003] However, the existing electrode recycling process usually adopts the method of "pyrolysis first and then de-powdering", which has the following defects: direct heating of the electrode, long pyrolysis time, low pyrolysis efficiency and high energy consumption; during the pyrolysis process, high-temperature pyrolysis will cause part of the positive electrode material to volatilize or degrade, resulting in low material recovery rate; during the separation process of the pyrolyzed material, it is difficult to completely remove the base material and other impurities, resulting in low product purity.

[0004] Therefore, how to provide a positive electrode plate powdering and then pyrolysis recovery system, which can improve pyrolysis efficiency, reduce energy consumption, and increase the recovery rate of plate materials and product purity, has become a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a positive electrode plate powdering and then pyrolysis recovery system, which can improve the pyrolysis efficiency, reduce energy consumption, and improve the recovery rate of the plate material and the product purity.

[0006] The technical solution provided by the present invention is as follows:

[0007] The present invention provides a positive electrode plate first pulverizing and then pyrolyzing recovery system, comprising: a conveyor, the conveyor is used to convey the recovered positive electrode plates; a pulverizing system connected to the conveyor, the pulverizing system is used to pulverize the positive electrode plates and divide the pulverized positive electrode plate particles into light materials and heavy materials; a screening device connected to the pulverizing system, the screening device is used to separate aluminum particles and black powder in the heavy materials; a first sending bin connected to the screening device, the first sending bin is used to temporarily store the separated black powder; a third vacuum conveying system connected to the first sending bin; a second sending bin connected to the screening device, the second sending bin is used to temporarily store the separated aluminum particles; a first vacuum conveying system connected to the second sending bin; an aluminum bin connected to the first vacuum conveying system; a black powder capturing system connected to the pulverizing system, the black powder capturing system is used to separate black powder particles and air carried by the light materials during the conveying process; a third sending bin and a fourth sending bin connected to the black powder capturing system, the third sending bin and the fourth sending bin The sending bin is used for temporarily storing the captured black powder; the exhaust dust treatment system connected to the black powder capturing system; the third sending bin and the fourth sending bin are also connected to the third vacuum conveying system; the sixth sending bin connected to the exhaust dust treatment system, the sixth sending bin is used for temporarily storing the black powder separated by dust removal; the sixth sending bin is also connected to the third vacuum conveying system; the black powder buffer bin connected to the third vacuum conveying system, the black powder buffer bin is used for centralized separation of the black powder particles carried during the conveying process; the pyrolysis system connected to the black powder buffer bin; the second vacuum conveying system connected to the black powder buffer bin; the exhaust dust treatment system connected to the pyrolysis system; the fifth sending bin connected to the exhaust dust treatment system, the fifth sending bin is used for temporarily storing the black powder separated by dust removal; the fifth sending bin is also connected to the second vacuum conveying system; the material handling system connected to the pyrolysis system; the fourth vacuum conveying system connected to the material handling system; the black powder bin connected to the fourth vacuum conveying system.

[0008] Furthermore, in a preferred embodiment of the present invention, the pulverizing system includes: a single-axis shredder connected to the conveyor, the single-axis shredder is used to shred the positive electrode sheets into blocks; a grinding and powdering main machine connected to the single-axis shredder, the grinding and powdering main machine is used to grind the shredded positive electrode sheets into mixed particles of aluminum particles and black powder.

[0009] Furthermore, in a preferred embodiment of the present invention, the pyrolysis system includes: a pyrolysis furnace feeder connected to the black powder buffer bin, the pyrolysis furnace feeder is used to continuously convey black powder; a pyrolysis rotary furnace connected to the pyrolysis furnace feeder, the pyrolysis rotary furnace is used to decompose organic matter in the black powder.

[0010] Furthermore, in a preferred embodiment of the present invention, the material processing system includes: a cooling device connected to the pyrolysis rotary furnace, the cooling device is used to cool the black powder after pyrolysis; wherein, after the black powder is cooled by the cooling device, it is transported to the black powder bin through the fourth vacuum conveying system.

[0011] Furthermore, in a preferred embodiment of the present invention, it further comprises: a nitrogen supply system connected to the pyrolysis rotary kiln, wherein the nitrogen supply system is used to continuously supply nitrogen to the pyrolysis rotary kiln.

[0012] Furthermore, in a preferred embodiment of the present invention, the black powder collection system includes: a cyclone collector connected to the crushing system, the cyclone collector is used to capture black powder during the conveying process; the cyclone collector is also connected to the third sending bin; a pulse collector connected to the cyclone collector, the pulse collector is used to capture black powder during the conveying process; the pulse collector is also connected to the fourth sending bin; a material high-pressure fan connected to the pulse collector, the material high-pressure fan is used to provide high-pressure air, and the generated airflow blows the black powder into the cyclone collector.

[0013] Furthermore, in a preferred embodiment of the present invention, the exhaust gas and dust treatment system comprises: a high-temperature dust collector connected to the pyrolysis system, wherein the high-temperature dust collector is used to recover black powder in the exhaust gas generated by pyrolysis and dust generated during the pyrolysis process.

[0014] Further, in a preferred embodiment of the present invention, the first vacuum conveying system includes: a first vacuum conveying device connected to the aluminum warehouse; a first vacuum pump connected to the first vacuum conveying device; the second vacuum conveying system includes: a second vacuum conveying device connected to the fifth sending warehouse; a second vacuum pump connected to the second vacuum conveying device; the third vacuum conveying system includes: a third vacuum conveying device connected to the first sending warehouse, the third sending warehouse, the fourth sending warehouse, and the sixth sending warehouse; a third vacuum pump connected to the third vacuum conveying device; the fourth vacuum conveying system includes: a fourth vacuum conveying device connected to the black powder warehouse; and a fourth vacuum pump connected to the fourth vacuum conveying device.

[0015] Furthermore, in a preferred embodiment of the present invention, the exhaust gas dust treatment system includes: a pulse dust collector connected to the material high-pressure blower; the pulse dust collector is used to recover black powder in the exhaust gas generated by the first vacuum pump, the second vacuum pump, the third vacuum pump and the fourth vacuum pump; and an exhaust chimney connected to the pulse dust collector is used to discharge the exhaust gas treated by the pulse dust collector.

[0016] Furthermore, in a preferred embodiment of the present invention, it also includes: an exhaust gas treatment system connected to the high-temperature dust collector, the exhaust gas treatment system including: an incinerator connected to the high-temperature dust collector, the incinerator is used for high-temperature incineration of organic matter in the exhaust gas; a quenching tower connected to the incinerator, the quenching tower is used to reduce the exhaust gas temperature; a first spray tower connected to the quenching tower; a second spray tower connected to the first spray tower; a demister connected to the second spray tower, the demister is used to remove moisture and droplets in the exhaust gas; an activated carbon adsorption tower connected to the demister, the activated carbon adsorption tower is used to adsorb harmful gases in the exhaust gas; an exhaust gas high-pressure fan connected to the activated carbon adsorption tower, the exhaust gas high-pressure fan is used to provide the airflow power required for exhaust gas treatment; an exhaust chimney connected to the exhaust gas high-pressure fan.

[0017] A system for recovering positive electrode sheets by first pulverizing them and then pyrolyzing them, provided in an embodiment of the present invention, comprises: a conveyor, the conveyor being used to convey recovered positive electrode sheets; a pulverizing system connected to the conveyor, the pulverizing system being used to pulverize positive electrode sheets and to separate the pulverized positive electrode sheet particles into light materials and heavy materials; a screening device connected to the pulverizing system, the screening device being used to separate aluminum particles and black powder from heavy materials; a first sending bin connected to the screening device, the first sending bin being used to temporarily store the separated black powder; a third vacuum conveying system connected to the first sending bin; a second sending bin connected to the screening device, the second sending bin being used to temporarily store the separated aluminum particles; a first vacuum conveying system connected to the second sending bin; an aluminum bin connected to the first vacuum conveying system; a black powder capturing system connected to the pulverizing system, the black powder capturing system being used to separate black powder particles and air carried by light materials during conveying; a third sending bin and a fourth sending bin connected to the black powder capturing system, the third sending bin and the The fourth sending bin is used for temporarily storing the captured black powder; the third sending bin and the fourth sending bin are also connected to the third vacuum conveying system; the exhaust gas dust treatment system is connected to the black powder capture system; the sixth sending bin is connected to the exhaust gas dust treatment system, and the sixth sending bin is used for temporarily storing the separated black powder; the sixth sending bin is also connected to the third vacuum conveying system; the black powder buffer bin communicated with the third vacuum conveying system, and the black powder buffer bin is used for centralized separation of black powder particles carried during the conveying process; the pyrolysis system connected to the black powder buffer bin; the second vacuum conveying system connected to the black powder buffer bin; the exhaust gas dust treatment system is connected to the pyrolysis system; the fifth sending bin is connected to the exhaust gas dust treatment system, and the fifth sending bin is used for temporarily storing the black powder separated by dust removal; the fifth sending bin is also connected to the second vacuum conveying system; the material handling system is connected to the pyrolysis system; the fourth vacuum conveying system is connected to the material handling system; the black powder bin connected to the fourth vacuum conveying system.

[0018] Among them, the technical solution involved in the present invention adopts the process of first powdering and then pyrolysis, and the conveyor conveys the recovered positive electrode plates into the crushing system, and the crushing system tears the positive electrode plates into pieces, de-powders them and separates them into heavy materials and light materials; the heavy materials are screened into aluminum particles and black powder by the screening device, and the screened black powder enters the first sending bin, and the screened aluminum particles enter the second sending bin, and enter the aluminum bin for storage through the first vacuum conveying system; the black powder particles in the light materials are captured by the black powder capture system, and the captured black powder is temporarily stored in the third sending bin and the fourth sending bin; the exhaust gas generated by the first vacuum conveying system, the second vacuum conveying system, the third vacuum conveying system and the fourth vacuum conveying system is separated from the black powder by the exhaust gas dust treatment system The particles and black powder particles enter the fifth sending bin; at the same time, the exhaust gas and dust generated by the pyrolysis system enter the exhaust gas and dust treatment system, and the separated black powder particles enter the fifth sending bin; the exhaust gas generated by the vacuum pump enters the exhaust gas and dust treatment system, and the separated black powder particles enter the sixth sending bin; the black powder temporarily stored in the first sending bin, the third sending bin, the fourth sending bin, and the sixth sending bin enters the black powder buffer bin through the third vacuum conveying system, and the black powder temporarily stored in the fifth sending bin enters the black powder buffer bin through the second vacuum conveying system; the black powder buffer bin conveys the black powder into the pyrolysis system for pyrolysis; the black powder after pyrolysis enters the material handling system for processing; and finally enters the black powder bin through the fourth vacuum conveying system. Through the processing of the pulverizing system, the positive electrode sheet material is completely separated from the substrate during the pulverizing stage, which avoids the volatilization and degradation of the material during the high-temperature pyrolysis process, reduces material loss, and improves the material recovery rate; at the same time, pulverizing first and then pyrolyzing, the powdered material has a large contact area, a shorter heating time, and improves the pyrolysis efficiency and reduces energy consumption. Compared with the prior art, the positive electrode plate powdering and then pyrolysis recovery system provided by the present invention can improve pyrolysis efficiency, reduce energy consumption, and increase the recovery rate of the plate material and product purity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of a system for first pulverizing a positive electrode sheet and then pyrolyzing and recovering it provided by an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of an exhaust gas treatment system involved in an embodiment of the present invention;

[0022] Figure 3 is a schematic diagram of a pulverizing system according to an embodiment of the present invention;

[0023] Figure 4 is a schematic diagram of a vacuum conveying system involved in an embodiment of the present invention;

[0024] Figure 5 is a schematic diagram of a pyrolysis system involved in an embodiment of the present invention;

[0025] Figure 6 A schematic diagram of an exhaust gas dust treatment system according to an embodiment of the present invention;

[0026] Figure 7 A schematic diagram of an exhaust gas and dust treatment system provided by an embodiment of the present invention;

[0027] Figure 8 A schematic diagram of a material processing system provided in an embodiment of the present invention.

[0028] Reference numerals:

[0029] Conveyor 1; crushing system 2; single-axis shredder 201; grinding and powder removal host 202; first sending bin 301; second sending bin 302; third sending bin 303; fourth sending bin 304; fifth sending bin 305; sixth sending bin 306; black powder buffer bin 307; first vacuum conveying system 31; first vacuum conveying device 312; first vacuum pump 313; second vacuum conveying system 32; second vacuum conveying device 308; second vacuum pump 309; third vacuum conveying system 33; third vacuum conveying device 310; third vacuum pump 311; fourth vacuum conveying system 34; fourth vacuum conveying device 314; fourth vacuum pump 315 15; pyrolysis system 4; pyrolysis furnace feeder 401; pyrolysis rotary kiln 402; black powder collection system 51; cyclone collector 501; pulse collector 502; material high-pressure fan 503; tail gas dust treatment system 52; pulse dust collector 504; tail gas dust treatment system; high-temperature dust collector 505; exhaust chimney 600; tail gas treatment system 6; incinerator 601; quenching tower 602; first spray tower 603; second spray tower 604; demister 605; activated carbon adsorption tower 606; tail gas high-pressure fan 607; tail gas chimney 608; aluminum warehouse 7; black powder warehouse 8; screening device 9; material handling system 10; cooling equipment 403. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0032] It should be understood that the terms "length", "width", "up", "down", "front", "back", "first", "second", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" and "several" is two or more, unless otherwise clearly and specifically defined.

[0034] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0035] like Figures 1 to 8As shown, a positive electrode sheet powdering and then pyrolysis recovery system provided by an embodiment of the present invention comprises: a conveyor 1, the conveyor 1 is used to convey the recovered positive electrode sheets; a crushing system 2 connected to the conveyor 1, the crushing system 2 is used to crush the positive electrode sheets and separate the crushed positive electrode sheet particles into light materials and heavy materials; a screening device 9 connected to the crushing system 2, the screening device 9 is used to separate aluminum particles and black powder in the heavy materials; a first sending bin 301 connected to the screening device 9, the first sending bin 301 is used to temporarily store the separated black powder; a first sending bin 301 connected to the first sending bin 301 three vacuum conveying systems 33; a second delivery bin 302 connected to the screening device 9, the second delivery bin 302 is used to temporarily store the separated aluminum particles; a first vacuum conveying system 31 connected to the second delivery bin 302; an aluminum bin 7 connected to the first vacuum conveying system 31; a black powder capture system 51 connected to the crushing system 2, the black powder capture system 51 is used to separate the black powder particles and air carried by the light material during the conveying process; a third delivery bin 303 and a fourth delivery bin 304 connected to the black powder capture system 51, the third delivery bin 303 and the fourth delivery bin 304 are used to collect the black powder particles and air carried by the light material during the conveying process; for temporarily storing captured black powder; the third sending bin 303 and the fourth sending bin 304 are also connected to the third vacuum conveying system 33; the exhaust gas dust treatment system 53 is connected to the black powder capture system 51; the sixth sending bin 306 is connected to the exhaust gas dust treatment system 53, and the sixth sending bin 306 is used for temporarily storing dust-removed and separated black powder; the sixth sending bin 306 is also connected to the third vacuum conveying system 33; the black powder buffer bin 307 connected to the third vacuum conveying system 33, and the black powder buffer bin 307 is used for centralized separation of black powder particles carried during the conveying process; and the A pyrolysis system 4 connected to a black powder buffer bin 307; a second vacuum conveying system 32 connected to the black powder buffer bin 307; an exhaust gas dust treatment system 52 connected to the pyrolysis system 4; a fifth sending bin 305 connected to the exhaust gas dust treatment system 52, the fifth sending bin 305 being used to temporarily store dust-removed and separated black powder; the fifth sending bin 305 is also connected to the second vacuum conveying system 32; a material handling system 10 connected to the pyrolysis system 4; a fourth vacuum conveying system 34 connected to the material handling system 10; and a black powder bin 8 connected to the fourth vacuum conveying system 34.

[0036] Among them, the technical solution involved in the present invention adopts the process of first powdering and then pyrolysis, and the conveyor 1 conveys the recovered positive electrode sheets into the crushing system 2, and the crushing system 2 tears the positive electrode sheets and de-powders them into heavy materials and light materials; the heavy materials are screened by the screening device 9 into aluminum particles and black powder, and the screened black powder enters the first sending bin 301, and the screened aluminum particles enter the second sending bin 302, and enter the aluminum bin 7 for storage through the first vacuum conveying system 31; the black powder particles in the light material are captured by the black powder capture system 51, and the captured black powder is temporarily stored in the third sending bin 303 and the fourth sending bin 304; the exhaust gas generated by the first vacuum conveying system 31, the second vacuum conveying system 32, the third vacuum conveying system 33 and the fourth vacuum conveying system 34 is separated into black powder particles through the exhaust gas dust treatment system 53, and the black powder particles enter Enter the fifth sending warehouse 305; at the same time, the exhaust gas and dust generated by the pyrolysis system 4 enter the exhaust gas and dust treatment system 52, and the separated black powder particles enter the fifth sending warehouse 305; the exhaust gas generated by the vacuum pump enters the exhaust gas dust treatment system 53, and the separated black powder particles enter the sixth sending warehouse 306; the black powder temporarily stored in the first sending warehouse 301, the third sending warehouse 303, the fourth sending warehouse 304, and the sixth sending warehouse 306 enters the black powder buffer warehouse 307 through the third vacuum conveying system 33, and the black powder temporarily stored in the fifth sending warehouse 305 enters the black powder buffer warehouse 307 through the second vacuum conveying system 32; the black powder buffer warehouse 307 conveys the black powder to the pyrolysis system 4 for pyrolysis; the black powder after pyrolysis enters the material handling system 10 for processing; finally, it enters the black powder warehouse 8 through the fourth vacuum conveying system 34. Through the processing of the pulverizing system 2, the positive electrode sheet material is completely separated from the substrate during the pulverizing stage, which avoids the volatilization and degradation of the material during the high-temperature pyrolysis process, reduces material loss, and improves the material recovery rate; at the same time, pulverizing first and then pyrolyzing, the powdered material has a large contact area, and the heating time is shorter, which improves the pyrolysis efficiency and reduces energy consumption. Compared with the prior art, the positive electrode sheet first pulverizing and then pyrolyzing recovery system provided by the present invention can improve the pyrolysis efficiency, reduce energy consumption, and improve the recovery rate of the electrode sheet material and the purity of the product.

[0037] More specifically, in the embodiment of the present invention, the screening device 9 is a disc screen.

[0038] More specifically, in an embodiment of the present invention, the black powder is a metal mixture composed of crushed waste battery materials, and the black powder includes lithium, manganese, cobalt and nickel.

[0039] More specifically, the heavy material is a mixture of aluminum material and a small amount of black powder; the light material is air carrying black powder particles.

[0040] Specifically, in an embodiment of the present invention, the pulverizing system 2 includes: a single-axis shredder 201 connected to the conveyor 1, and the single-axis shredder 201 is used to tear the positive electrode sheets into blocks; a grinding and powdering host 202 connected to the single-axis shredder 201, and the grinding and powdering host 202 is used to grind the shredded positive electrode sheets into mixed particles of aluminum particles and black powder.

[0041] Among them, the conveyor 1 conveys the recycled positive electrode sheets to the single-shaft shredder 201 of the pulverizing system 2, and the single-shaft shredder 201 shreds the positive electrode sheets into blocks. The shredded blocks enter the grinding and de-powdering main machine 202 through the conveying system, and the grinding and de-powdering main machine 202 further grinds the shredded positive electrode sheets into mixed particles of aluminum particles and black powder. The high-speed rotating blades of the single-shaft shredder 201 shred the positive electrode sheets into uniform blocks, avoiding agglomeration to facilitate grinding and separation, thereby improving the overall operating efficiency; the shredded blocks are further ground into particles by the grinding and de-powdering main machine 202 to ensure that the positive electrode material, i.e., black powder, and the substrate, i.e., aluminum particles, are completely separated, and the size of the mixed particles after grinding is uniform, which is conducive to subsequent separation and processing, thereby improving the purity of the recycled materials. The entire process ensures the efficient shredding, grinding, separation and processing of the positive electrode sheets, and realizes high-purity recovery of materials.

[0042] Specifically, in an embodiment of the present invention, the pyrolysis system 4 includes: a pyrolysis furnace feeder 401 connected to the black powder buffer bin 307, and the pyrolysis furnace feeder 401 is used to continuously convey black powder; a pyrolysis rotary furnace 402 connected to the pyrolysis furnace feeder 401, and the pyrolysis rotary furnace 402 is used to decompose organic matter in the black powder.

[0043] The pyrolysis furnace feeder 401 continuously and evenly feeds the black powder into the pyrolysis rotary furnace 402. The pyrolysis rotary furnace 402 pyrolyzes the black powder at a high temperature, usually 500-800°C, to decompose the organic matter therein, thereby ensuring that the organic matter in the black powder is completely removed and improving the purity of the black powder.

[0044] Specifically, in an embodiment of the present invention, the material processing system 10 includes: a cooling device 403 connected to the pyrolysis rotary furnace 402, and the cooling device 403 is used to cool the black powder after pyrolysis; wherein, after the black powder is cooled by the cooling device 403, it is transported to the black powder bin 8 through the fourth vacuum conveying system 34.

[0045] Among them, the temperature of the black powder after pyrolysis is relatively high. The cooling device 403 reduces the temperature of the black powder after pyrolysis to a safe range by cooling water or air. The cooled black powder is sent to the black powder bin through the conveying system to ensure the stability of the physical properties of the black powder, which is convenient for subsequent storage and use. The whole process realizes the high-purity recovery of materials, improves the continuity and stability of the system, and ensures the production efficiency and the quality of the recycled materials.

[0046] Specifically, in the embodiment of the present invention, it also includes: a nitrogen supply system connected to the pyrolysis rotary furnace 402 , and the nitrogen supply system is used to continuously supply nitrogen to the pyrolysis rotary furnace 402 .

[0047] Among them, the nitrogen supply system continuously supplies nitrogen to the pyrolysis rotary kiln to ensure that the pyrolysis process is carried out in an inert gas environment, prevent oxidation reactions, and improve pyrolysis efficiency. At the same time, the continuous supply of nitrogen ensures that the pyrolysis process is carried out in an oxygen-free environment, avoids the oxidation reaction of organic matter, reduces the generation of harmful gases, and improves the purity of the pyrolysis products.

[0048] Specifically, in an embodiment of the present invention, the black powder collection system 51 includes: a cyclone collector 501 connected to the crushing system 2, and the cyclone collector 501 is used to capture black powder during transportation; the cyclone collector 501 is also connected to the third sending bin 303; a pulse collector 502 connected to the cyclone collector 501, and the pulse collector 502 is used to capture black powder during transportation; the pulse collector 502 is also connected to the fourth sending bin 304; a material high-pressure fan 503 connected to the pulse collector 502, and the material high-pressure fan 503 is used to provide high-pressure air, and the generated airflow blows the black powder into the cyclone collector 501.

[0049] Specifically, in the embodiment of the present invention, the exhaust gas and dust treatment system 52 includes: a high-temperature dust collector 505 connected to the pyrolysis system 4, and the high-temperature dust collector 505 is used to recover the exhaust gas generated by pyrolysis and the black powder in the dust generated during the pyrolysis process.

[0050] Specifically, in an embodiment of the present invention, the exhaust gas dust treatment system 53 includes: a pulse dust collector 504 connected to the material high-pressure fan 503; the pulse dust collector 504 is used to recover black powder in the exhaust gas generated by the first vacuum pump 313, the second vacuum pump 309, the third vacuum pump 311 and the fourth vacuum pump 315; an exhaust chimney 600 connected to the pulse dust collector 504, and the exhaust chimney 600 is used to discharge the exhaust gas treated by the pulse dust collector 504.

[0051] The exhaust gas discharged by the vacuum pump is processed by the pulse dust collector 504 before being discharged, ensuring that the exhaust gas meets the requirements of environmental protection regulations.

[0052] Among them, the black powder capture system 51 and the exhaust dust treatment system 52 ensure the efficient capture and recovery of black powder during the entire transportation and processing process. The dual capture mechanism of the cyclone collector 501 and the pulse collector 502 ensures that the black powder is effectively captured during the transportation process, reducing the loss of black powder. The high-pressure airflow provided by the material high-pressure fan 503 blows the captured black powder back into the cyclone collector 501, further improving the recovery rate of the black powder. The pulse dust collector 504 and the high-temperature dust collector 505 respectively capture the black powder in the dust generated during the transportation process and the pyrolysis process, ensuring the cleanliness and efficient operation of the entire system.

[0053] Specifically, in an embodiment of the present invention, the first vacuum conveying system 31 includes: a first vacuum conveying device 312 connected to the aluminum warehouse 7; a first vacuum pump 313 connected to the first vacuum conveying device 312; the second vacuum conveying system 32 includes: a second vacuum conveying device 308 connected to the fifth sending warehouse 305; a second vacuum pump 309 connected to the second vacuum conveying device 308; the third vacuum conveying system 33 includes: a third vacuum conveying device 310 connected to the first sending warehouse 301, the third sending warehouse 303, the fourth sending warehouse 304, and the sixth sending warehouse 306; a third vacuum pump 311 connected to the third vacuum conveying device 310; the fourth vacuum conveying system 34 includes: a fourth vacuum conveying device 314 connected to the black powder warehouse 8; and a fourth vacuum pump 315 connected to the fourth vacuum conveying device 314.

[0054] Among them, through multiple vacuum conveying devices, it is ensured that the material has a stable intermediate storage point during the conveying process, reducing the pressure fluctuation during the conveying process and improving the stability of the conveying; through the negative pressure conveying of the vacuum pump, the material is conveyed from the matching vacuum conveying device to the target storage bin, ensuring the efficient transmission of the material during the conveying process and reducing the generation of dust. At the same time, through the conveying system, the closed conveying of the material is realized, the leakage of the material during the conveying process is reduced, and the material recovery rate is improved.

[0055] Specifically, in the embodiment of the present invention, it also includes: an exhaust gas treatment system 6 connected to the high-temperature dust collector 505, and the exhaust gas treatment system 6 includes: an incinerator 601 connected to the high-temperature dust collector 505, and the incinerator 601 is used to incinerate organic matter in the exhaust gas at high temperature; a quenching tower 602 connected to the incinerator 601, and the quenching tower 602 is used to reduce the exhaust gas temperature; a first spray tower 603 connected to the quenching tower 602; a second spray tower 603 connected to the first spray tower 603 Tower 604; a demister 605 connected to the second spray tower 604, the demister 605 is used to remove moisture and droplets in the exhaust gas; an activated carbon adsorption tower 606 connected to the demister 605, the activated carbon adsorption tower 606 is used to adsorb harmful gases in the exhaust gas; an exhaust gas high-pressure fan 607 connected to the activated carbon adsorption tower 606, the exhaust gas high-pressure fan 607 is used to provide the airflow power required for exhaust gas treatment; an exhaust gas chimney 608 connected to the exhaust gas high-pressure fan 607.

[0056] Among them, through high-temperature incineration, the organic matter in the tail gas is completely decomposed, reducing the emission of harmful substances; through rapid cooling, the tail gas temperature is rapidly reduced, avoiding the damage of high-temperature tail gas to subsequent treatment equipment; through spraying water, the particulate matter and some harmful gases in the tail gas are removed, and the tail gas is initially purified; through secondary spraying, the particulate matter and harmful gases in the tail gas are further removed, and the tail gas is further purified; through demisting, the tail gas humidity is avoided to be too high, thereby affecting the subsequent treatment equipment; through the adsorption of activated carbon, harmful gases in the tail gas are removed; through the operation of the high-pressure fan 607, the smooth flow of the tail gas in the treatment system is ensured, and the tail gas treatment efficiency is improved; through the tail gas chimney 608, the treated tail gas is discharged into the atmosphere, ensuring that the discharged tail gas meets the environmental protection standards. Through the multi-stage purification of the quenching tower 602, the first spray tower 603, the second spray tower 604, the demister 605 and the activated carbon adsorption tower 606, it is ensured that the harmful substances in the tail gas are effectively removed, the discharged tail gas meets the environmental protection standards, and at the same time, the corrosion and damage of the equipment are reduced, and the service life of the equipment is extended.

[0057] More specifically, in an embodiment of the present invention, the pyrolysis rotary furnace 402 includes: a rotary furnace body connected to the outlet of the pyrolysis furnace feeder 401, the rotary furnace body including two structures: a preheating section structure located at one end of the rotary furnace body close to the pyrolysis furnace feeder 401; a main pyrolysis section structure located at one end of the rotary furnace body away from the pyrolysis furnace feeder 401; a temperature control system provided on the rotary furnace body, the temperature control system including: a preheating section temperature sensor provided on the inner wall of the preheating section structure; a preheating section heating element provided on the inner wall of the preheating section structure; a main pyrolysis section temperature sensor provided on the inner wall of the main pyrolysis section structure; and a main pyrolysis section heating element provided on the inner wall of the main pyrolysis section structure.

[0058] More specifically, in an embodiment of the present invention, the target temperature range of the preheating section structure is 200°C-400°C, and the target temperature range of the main pyrolysis section is 500°C-800°C.

[0059] Among them, directly sending room temperature materials into the high-temperature main pyrolysis section will cause thermal shock to the equipment, causing deformation or damage to the equipment. The preheating section can gradually increase the material temperature, reduce thermal shock, protect the service life of the equipment, and make the temperature of the material more uniform when entering the main pyrolysis section, ensure the uniformity of the pyrolysis process, reduce the side reactions of the material in the main pyrolysis section, such as excessive carbonization or coking, ensure the purity and quality of the pyrolysis products, and improve the quality of the product. In addition, the temperature required for preheating is relatively low, and the energy required is also less, which reduces the overall energy consumption. The main pyrolysis section structure performs high-temperature pyrolysis on the preheated material, decomposes the organic matter therein, and generates gas and dust. The temperature control system ensures that the temperature of the preheating section and the main pyrolysis section is within the set range, realizes precise temperature control, and improves the pyrolysis efficiency and product quality. Through segmented heating, this system shortens the heating time of the main pyrolysis section, thereby shortening the time of the entire pyrolysis process, reducing production energy consumption, and improving production efficiency.

[0060] More specifically, in an embodiment of the present invention, it also includes: a multi-stage grinding device arranged inside the grinding and de-powdering main machine 202, the multi-stage grinding device includes: a main machine feed port; a grinding and de-powdering main machine body; a first-level grinding mechanism connected to the main machine feed port, the first-level grinding mechanism includes: a first-level rotating grinding roller arranged on the inner wall of the grinding and de-powdering main machine body; a first-level grinding plate arranged below the first-level rotating grinding roller; a first-level screen arranged at the outlet of the first-level grinding mechanism; a second-level grinding mechanism connected to the first-level grinding mechanism, the second-level grinding mechanism includes: a second-level rotating grinding roller arranged on the inner wall of the grinding and de-powdering main machine body; a second-level grinding plate arranged below the second-level rotating grinding roller; a second-level screen arranged at the outlet of the second-level grinding mechanism; a third-level grinding mechanism connected to the second-level grinding mechanism, the third-level grinding mechanism includes: a third-level rotating grinding roller arranged on the inner wall of the grinding and de-powdering main machine body; a third-level grinding plate arranged below the third-level rotating grinding roller; a third-level screen arranged at the outlet of the third-level grinding mechanism; a main machine discharge port connected to the third-level grinding mechanism.

[0061] More specifically, in the embodiment of the present invention, it also includes: a protruding structure provided on the primary grinding plate, the secondary grinding plate and the tertiary grinding plate.

[0062] Among them, the shredded materials enter the grinding and de-powdering main machine from the main machine feed port, and are processed by the first-level grinding mechanism. The first-level rotating grinding roller performs preliminary grinding on the incoming materials through high-speed rotation. The first-level grinding plate cooperates with the first-level rotating grinding roller to further refine the materials through shearing and extrusion. The materials that have completed the first-level grinding process are screened through the first-level screen, and the materials that do not meet the standards are returned to the first-level grinding mechanism for further grinding; the materials that have completed the first-level grinding process are processed by the second-level grinding mechanism, and the second-level rotating grinding roller further grinds the incoming materials through high-speed rotation. The second-level grinding plate cooperates with the second-level rotating grinding roller to further refine the materials through shearing and extrusion. The materials that have completed the second-level grinding process are screened through the second-level screen, and the materials that do not meet the standards are returned to the second-level grinding mechanism for further grinding; the materials that have completed the second-level grinding process are processed by the third-level grinding mechanism, and the third-level rotating grinding roller performs final grinding on the incoming materials through high-speed rotation. The third-level grinding plate cooperates with the third-level rotating grinding roller to further refine the materials through shearing and extrusion. The materials that have completed the third-level grinding process are screened through the third-level screen, and the materials that do not meet the standards are returned to the third-level grinding mechanism for further grinding. In addition, the raised structure on the grinding plate increases the roughness of the grinding plate, improves grinding efficiency, and reduces grinding time and energy consumption; the screens at the exits of each level of grinding mechanism ensure that only materials that reach the specified particle size can pass through, and materials that do not meet the standard return to the grinding mechanism for further grinding, ensuring the grinding effect. Through the step-by-step refinement of the multi-level grinding mechanism, dynamic powder removal is achieved, ensuring that the positive electrode material is completely separated from the substrate, reducing impurities, improving the purity of the recycled material, and improving the material recovery rate. At the same time, the design of the multi-level grinding mechanism reduces the load of a single grinding mechanism and extends the service life of the equipment.

[0063] More specifically, in the embodiment of the present invention, it also includes: a waste heat recovery device disposed between the pyrolysis rotary furnace 402 and the cooling device 403; and an opening structure disposed on the preheating section structure and connected to the outlet of the waste heat recovery device.

[0064] More specifically, in an embodiment of the present invention, the waste heat recovery device includes: a heat exchanger connected to the outlet of the pyrolysis rotary furnace 402, the heat exchanger is used to recover heat in the high-temperature gas discharged from the pyrolysis rotary furnace 402; a heat exchange tube arranged inside the heat exchanger, the heat exchange tube is used to transfer heat; a fan connected to the heat exchange tube, the fan is used to introduce the high-temperature gas discharged from the pyrolysis rotary furnace 402 into the heat exchanger.

[0065] Among them, the suction effect of the fan ensures that the high-temperature gas can smoothly enter the heat exchanger, thereby improving the efficiency of heat exchange; through the heat exchange process, the heat in the high-temperature gas is transferred to the material that needs to be preheated, realizing energy recycling, and at the same time, by introducing the recovered heat into the preheating section, the heating efficiency of the preheating section is improved and energy consumption is reduced.

[0066] To elaborate more specifically, lithium batteries have the characteristics of high energy density, long cycle life, safety and environmental protection, and are widely used in production and life. From small electronic devices such as Bluetooth headsets to large energy storage systems such as power station energy storage, lithium batteries are indispensable. In the production process of lithium batteries, a large number of pole pieces and unqualified pole pieces are generated. These scraps and unqualified materials not only take up a lot of storage space, but also are a valuable resource library, so battery pole piece recycling is of great significance.

[0067] The production line of a positive electrode plate powdering and then pyrolysis recovery system provided by the present invention is divided into three major sections: crushing and powdering, pyrolysis recovery, and tail gas treatment. First, the plate material is crushed, scattered and powdered, and ground to remove powder. The black powder that falls off the plate is collected and then pyrolyzed. Finally, the pyrolyzed material is cooled and packaged. The plate is manually put into the conveyor, and the aluminum particles and black powder are peeled off in the crushing and powdering section. The aluminum particles are then transported to the aluminum bin and the black powder is transported to the black powder buffer bin through the vacuum conveying system; the black powder in the black powder buffer bin is sent to the pyrolysis system through the conveyor, and the pyrolyzed material is cooled by the cooling equipment and then transported to the black powder bin for collection through the vacuum conveying system. By optimizing the process flow, the problems of the traditional pyrolysis followed by powdering process, such as large floor space occupation, high energy consumption, low material recovery rate, and easy material leakage at the connection between each equipment, are solved. The technical solution involved in the present invention can ensure that the positive electrode sheet material is cleanly stripped, the recovered positive electrode sheet material is of high purity, the pyrolysis efficiency is high, the equipment occupies a small area, the recovered positive electrode material can meet the battery grade standard, and the whole process adopts closed transportation, without dust leakage and low energy consumption.

[0068] Compared with the prior art, the positive electrode sheet powdering and pyrolysis recovery system provided by the present invention has low energy consumption and improved the recovery rate of the electrode sheet material through dust-free crushing, dynamic powder removal and segmented pyrolysis. At the same time, the equipment occupies a small area. By optimizing the process, the recovered materials can be used as battery-grade black powder without purification treatment, which reduces the operating cost. At the same time, the tail gas is dust-free and no harmful gas is emitted, so that the system meets environmental protection requirements.

[0069] Specifically, the positive electrode sheet is manually put into the conveyor 1, and the conveyor 1 uniformly conveys the material to the single-axis shredder 201. The shredded material is uniform in size and has no agglomeration. Subsequently, the material enters the grinding and de-powdering main machine 202. The material after grinding and de-powdering is divided into light material and heavy material. The heavy material is a mixture of aluminum material and a small amount of black powder. It enters the screening device 9 to screen out aluminum particles and black powder. The black powder enters the first sending bin 301, and the aluminum particles enter the second sending bin 302. The first vacuum pump 313 is started to generate a negative pressure vacuum, and the aluminum material is sucked into the first vacuum conveying device 312. The first vacuum conveying device 312 has the function of sucking and unloading. After unloading, the material enters the aluminum bin 7. At the same time, the light material is sent to the cyclone collector 501 and the pulse collector 502 respectively through pneumatic conveying, and enters the third sending bin 303 and the fourth sending bin 304 respectively. The dust collected by the pulse dust collector 504 enters the sixth sending bin 306. Next, the third vacuum pump 311 is started to generate negative pressure vacuum, and the black powder in the sending bin is sucked into the third vacuum conveying device 310. After the third vacuum conveying device 310 is unloaded, the black powder enters the black powder buffer bin 307. After the black powder in the black powder buffer bin 307 enters the pyrolysis furnace feeder 401, it is sent to the pyrolysis rotary kiln 402, and the pyrolysis rotary kiln 402 works under nitrogen protection. The tail gas and dust generated during the pyrolysis process enter the high-temperature dust collector 505 together, and the dust remains in the high-temperature dust collector 505, and then enters the fifth sending bin 305. Subsequently, the dust is sucked into the second vacuum conveying device 308. After the second vacuum conveying device 308 is unloaded, the black powder enters the black powder buffer bin 307 again. The exhaust gas after dust removal enters the exhaust gas treatment system 6, and is treated in turn by the incinerator 601, the quenching tower 602, the first spray tower 603, the second spray tower 604, the demister 605 and the activated carbon adsorption tower 606, and then sucked out by the exhaust high-pressure fan 607 and discharged through the exhaust chimney 608. The exhaust gas treated by the exhaust gas treatment system meets the relevant national emission standards. The pyrolyzed material enters the cooling equipment 403, and the black powder is sucked into the fourth vacuum conveying device 314 after cooling. After the fourth vacuum conveying device 314 is unloaded, the black powder enters the black powder bin for collection. In addition, the exhaust gas discharged by the vacuum pump is treated by the pulse dust collector 504 and then discharged through the exhaust chimney 600. This series of steps ensures the high efficiency, dust-free, low energy consumption and environmental friendliness of the entire system.

[0070] Among them, the technical solution involved in the present invention ensures that the positive electrode sheet material is completely separated from the substrate through the process of first powdering and then pyrolysis, avoids volatilization and degradation of materials during high-temperature pyrolysis, reduces material loss, and improves material recovery rate. This system is mainly divided into two stages: in the de-powdering stage, the conveyor 1 continuously conveys the recovered positive electrode sheets to the single-axis shredder 201, and the single-axis shredder 201 tears the positive electrode sheets into blocks, and then the grinding and de-powdering host 202 further grinds the shredded materials to completely separate the positive electrode sheet material from the substrate, generating light material, i.e., black powder, and heavy material, i.e., a mixture of aluminum material and part of the black powder; through multi-stage capture coordinated by the cyclone collector 501 and the pulse collector 502, the black powder in the light material is further collected to improve the recovery rate; the material high-pressure blower 5 03 provides the high-pressure air required for pneumatic conveying to ensure the efficient transmission of materials during the conveying process; ensures the purity of the positive electrode material by separating the screening device 9 and multiple sending bins; the conveying system transports the black powder and aluminum particles from each sending bin to the target storage bin through negative pressure to ensure that the material does not generate dust during the transmission process and keep the working environment clean; the aluminum bin 7 stores the aluminum particles transported by the conveying system, ready for further processing or sales; the black powder buffer bin 307 stores the black powder transported by the conveying system, ready to be fed into the pyrolysis furnace feeder 401. During the pyrolysis stage, the pyrolysis furnace feeder 401 continuously conveys black powder into the pyrolysis rotary furnace 402 to ensure that the pyrolysis process is stable and continuous; the organic matter in the black powder is decomposed by the high-temperature pyrolysis of the pyrolysis rotary furnace 402; the dust generated during the transportation process is captured by the high-temperature dust collector 505 and the pulse dust collector 504 to ensure the cleanliness of the transportation process; the pyrolyzed black powder is cooled by the cooling equipment 403 to ensure that the material temperature drops to a safe range; the black powder bin 8 stores the cooled black powder for further processing or sale. Compared with the prior art, the positive electrode plate first powdering and then pyrolysis recovery system provided in the embodiment of the present invention adopts the method of first crushing the plate material, breaking up the powder, grinding and powdering, and collecting the black powder that falls off the plate, and then pyrolyzing the collected material, cooling and packaging the pyrolyzed material, which can improve the pyrolysis efficiency, reduce energy consumption, and improve the recovery rate of the plate material and the purity of the product.

[0071] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A positive electrode sheet first powdering and then pyrolysis recovery system, characterized in that: include: A conveyor (1), wherein the conveyor (1) is used to convey recovered positive electrode sheets; A pulverizing system (2) connected to the conveyor (1), the pulverizing system (2) being used to pulverize the positive electrode sheets and to separate the pulverized positive electrode sheet particles into light materials and heavy materials; A screening device (9) connected to the pulverizing system (2), the screening device (9) being used to separate aluminum particles and black powder from heavy materials; a first sending bin (301) connected to the screening device (9), the first sending bin (301) being used for temporarily storing the separated black powder; a third vacuum conveying system (33) connected to the first sending bin (301); a second sending bin (302) connected to the screening device (9), the second sending bin (302) being used for temporarily storing the separated aluminum particles; a first vacuum conveying system (31) connected to the second sending bin (302); an aluminum warehouse (7) connected to the first vacuum conveying system (31); A black powder collecting system (51) connected to the pulverizing system (2), the black powder collecting system (51) being used to separate black powder particles and air carried by light materials during transportation; An exhaust dust treatment system (53) connected to the black powder collection system (51); a sixth sending bin (306) connected to the exhaust dust treatment system (53), the sixth sending bin (306) being used to temporarily store the black powder separated by dust removal; the sixth sending bin (306) is also connected to the third vacuum conveying system (33); A third sending bin (303) and a fourth sending bin (304) connected to the black powder capturing system (51), the third sending bin (303) and the fourth sending bin (304) being used to temporarily store the captured black powder; the third sending bin (303) and the fourth sending bin (304) are also connected to the third vacuum conveying system (33); a black powder buffer bin (307) in communication with the third vacuum conveying system (33), the black powder buffer bin (307) being used for centrally separating black powder particles carried during the conveying process; A pyrolysis system (4) connected to the black powder buffer (307); A second vacuum conveying system (32) connected to the black powder buffer (307); An exhaust dust treatment system (52) connected to the pyrolysis system (4); a fifth sending bin (305) connected to the exhaust dust treatment system (52), the fifth sending bin (305) being used to temporarily store the black powder separated by dust removal; the fifth sending bin (305) is also connected to the second vacuum conveying system (32); a material handling system (10) connected to the pyrolysis system (4); a fourth vacuum conveying system (34) connected to the material handling system (10); A black powder bin (8) connected to the fourth vacuum conveying system (34).

2. The positive electrode sheet powdering and then pyrolysis recovery system according to claim 1 is characterized in that: The pulverizing system (2) comprises: A single-shaft shredder (201) connected to the conveyor (1), the single-shaft shredder (201) being used to shred the positive electrode sheets into blocks; A grinding and powder removal main machine (202) connected to the single-shaft shredder (201), the grinding and powder removal main machine (202) is used to grind the shredded positive electrode sheets into mixed particles of aluminum particles and black powder.

3. The positive electrode sheet powdering and then pyrolysis recovery system according to claim 1 is characterized in that: The pyrolysis system (4) comprises: A pyrolysis furnace feeder (401) connected to the black powder buffer bin (307), the pyrolysis furnace feeder (401) being used to continuously convey black powder; A pyrolysis rotary kiln (402) is connected to the pyrolysis furnace feeder (401), and the pyrolysis rotary kiln (402) is used to decompose organic matter in black powder.

4. The positive electrode sheet powdering and then pyrolysis recovery system according to claim 3 is characterized in that: The material processing system (10) comprises: A cooling device (403) connected to the pyrolysis rotary kiln (402), wherein the cooling device (403) is used to cool the black powder after pyrolysis; After the black powder is cooled in the cooling device (403), it is transported to the black powder bin (8) through the fourth vacuum transport system (34).

5. The positive electrode sheet powdering and then pyrolysis recovery system according to claim 4 is characterized in that: Also includes: A nitrogen supply system connected to the pyrolysis rotary furnace (402), wherein the nitrogen supply system is used to continuously supply nitrogen to the pyrolysis rotary furnace (402).

6. The positive electrode sheet powdering and then pyrolysis recovery system according to claim 5 is characterized in that: The tail gas and dust treatment system (52) comprises: a high temperature dust collector (505) connected to the pyrolysis system (4), wherein the high temperature dust collector (505) is used to recover the tail gas generated by the pyrolysis and the black powder in the dust generated during the pyrolysis process.

7. The positive electrode sheet powdering and then pyrolysis recovery system according to claim 1 is characterized in that: The black powder collecting system (51) comprises: a cyclone collector (501) connected to the pulverizing system (2), the cyclone collector (501) being used to capture black powder during transportation; the cyclone collector (501) is also connected to the third sending bin (303); a pulse collector (502) connected to the cyclone collector (501), the pulse collector (502) being used to capture black powder during the conveying process; the pulse collector (502) is also connected to the fourth sending bin (304); A material high-pressure blower (503) connected to the pulse collector (502) is used to provide high-pressure air, and the generated airflow blows the black powder into the cyclone collector (501).

8. The positive electrode sheet powdering and then pyrolysis recovery system according to claim 7 is characterized in that: The first vacuum conveying system (31) comprises: A first vacuum conveying device (312) connected to the aluminum warehouse (7); a first vacuum pump (313) connected to the first vacuum conveying device (312); The second vacuum conveying system (32) comprises: A second vacuum conveying device (308) connected to the fifth sending bin (305); a second vacuum pump (309) connected to the second vacuum conveying device (308); The third vacuum conveying system (33) comprises: a third vacuum conveying device (310) connected to the first sending chamber (301), the third sending chamber (303), the fourth sending chamber (304), and the sixth sending chamber (306); a third vacuum pump (311) connected to the third vacuum conveying device (310); The fourth vacuum conveying system (34) comprises: a fourth vacuum conveying device (314) connected to the black powder bin (8); A fourth vacuum pump (315) connected to the fourth vacuum conveying device (314).

9. The positive electrode sheet powdering and then pyrolysis recovery system according to claim 8, characterized in that: The tail gas dust treatment system (53) comprises: A pulse dust collector (504) connected to the material high-pressure blower (503); the pulse dust collector (504) is used to recover black powder in the tail gas generated by the first vacuum pump (313), the second vacuum pump (309), the third vacuum pump (311) and the fourth vacuum pump (315); An exhaust chimney (600) is connected to the pulse dust collector (504), and the exhaust chimney (600) is used to discharge the exhaust gas processed by the pulse dust collector (504).

10. The positive electrode sheet powdering and then pyrolysis recovery system according to claim 9, characterized in that: Also includes: An exhaust gas treatment system (6) connected to the high-temperature dust collector (505), the exhaust gas treatment system (6) comprising: An incinerator (601) connected to the high-temperature dust collector (505), the incinerator (601) being used for high-temperature incineration of organic matter in the tail gas; A quenching tower (602) connected to the incinerator (601), the quenching tower (602) is used to reduce the temperature of the tail gas; a first spray tower (603) connected to the quenching tower (602); a second spray tower (604) connected to the first spray tower (603); a demister (605) connected to the second spray tower (604), the demister (605) being used to remove moisture and mist droplets from the tail gas; an activated carbon adsorption tower (606) connected to the demister (605), the activated carbon adsorption tower (606) being used to adsorb harmful gases in the tail gas; A tail gas high pressure blower (607) connected to the activated carbon adsorption tower (606), the tail gas high pressure blower (607) is used to provide air flow power required for tail gas treatment; An exhaust gas chimney (608) connected to the exhaust gas high pressure blower (607).

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