System for recovering positive electrode material from battery positive electrode plate

Abstract

The utility model discloses a system for recovering a positive pole material from a battery positive pole piece, which comprises a first disassembling device, a pyrolysis device, a second disassembling device, a screening assembly, a rinsing bath and a solid-liquid separation assembly which are sequentially connected along the material conveying direction, and the rinsing bath is provided with an ultrasonic generator; the system further comprises a first pipeline and a tail gas treatment system; the tail gas treatment system is connected with the first disassembling device, the pyrolysis device and the second disassembling device through the first pipeline; the first disassembling device and the second disassembling device are respectively arranged at the upstream and the downstream of the pyrolysis device, so that most pole piece powder can be recovered by the screening assembly, and the working pressure of the rinsing bath is reduced; the separated aluminum foil can be subjected to ultrasonic water washing through the water washing tank and is matched with the solid-liquid separation assembly, so that residual pole piece powder in the aluminum foil can be easily recycled; and by arranging the tail gas treatment system, the remaining pole piece powder in the gas is recycled.

Description

Technical Field

[0001] The utility model relates to the technical field of battery material recycling, in particular to a system for recycling positive electrode materials from positive electrode sheets of batteries. Background Art

[0002] In recent years, with the steady growth of lithium-ion battery market demand, lithium-ion battery production capacity has continued to expand, and a large number of waste lithium battery electrodes have appeared during production and use.

[0003] The existing method for recycling waste lithium battery pole pieces is: pyrolysis treatment of waste lithium battery pole pieces to obtain pyrolysis electrode materials, then ultrasonic acid treatment of the pyrolysis electrode materials to obtain leaching solution and leaching residues, and then screening the leaching residues to obtain positive pole pieces. The above treatment method will concentrate the treatment of the pole pieces in the ultrasonic acid treatment, making the recovery pressure of the ultrasonic acid treatment relatively high, and flammable and explosive hydrogen will be generated during the ultrasonic acid treatment process. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a system for recovering positive electrode materials from positive electrode sheets of batteries.

[0005] The technical scheme of the utility model is as follows, comprising a first disassembling device, a pyrolysis device, a second disassembling device, a screening component, a washing tank and a solid-liquid separation component for solid-liquid separation of the mixed material after washing, which are sequentially connected along the material conveying direction, wherein the screening component is used to screen the crushed waste battery pole pieces and screen out the pole piece powder and aluminum foil, the washing tank is equipped with an ultrasonic generator, and the washing tank is used to wash the aluminum foil; and further comprising an exhaust gas treatment system for dust recovery, wherein the exhaust gas treatment system is connected to the first disassembling device, the pyrolysis device and the second disassembling device through a first pipeline.

[0006] According to the system for recovering positive electrode materials from positive electrode sheets of a battery of the utility model, at least the following technical effects are achieved: the first disassembling device is located upstream of the pyrolysis device, ensuring that the sheet can be broken into pieces before entering the pyrolysis device, so that the sheet can be pyrolyzed more fully, and in addition, the initial crushing also helps the sheet powder to be more easily separated from the aluminum foil; the second disassembling device is located downstream of the pyrolysis device, and the second disassembling device can further crush the sheet after pyrolysis is completed, so that most of the sheet powder is separated from the aluminum foil, so that the screening component can recover most of the sheet powder, thereby reducing the working pressure of the water washing tank; the separated aluminum foil can be ultrasonically washed in the water washing tank, and cooperated with the solid-liquid separation component to easily recover the remaining sheet powder in the aluminum foil, and no flammable and explosive hydrogen will be generated; by setting up an exhaust gas treatment system, the remaining sheet powder in the gas can be recovered, and it is combined with the recovery of the screening component and the recovery of the solid-liquid separation component, so that the system is divided into three parts to recover the sheet powder, ensuring the recovery rate of the sheet powder and avoiding dust spillage.

[0007] Furthermore, the exhaust gas treatment system includes at least one dust collector and a first fan connected in sequence along the gas conveying direction.

[0008] Furthermore, the screening assembly includes a first vibrating screen and a cyclone collector, the cyclone collector is respectively connected to the discharge port of the second disassembling device, the feed port of the first vibrating screen and the exhaust gas treatment system, and a second fan is connected between the cyclone collector and the exhaust gas treatment system.

[0009] Furthermore, it also includes a second pipeline, the cyclone collector is connected to the first pipeline through the second pipeline, and the second fan is arranged on the second pipeline.

[0010] Furthermore, the solid-liquid separation component includes a plurality of solid-liquid separation devices connected in sequence.

[0011] Furthermore, the liquid outlet of the last solid-liquid separation device is connected to the water inlet of the washing tank.

[0012] Furthermore, two solid-liquid separation devices are provided, and the two solid-liquid separation devices are respectively a second vibrating screen and a filter press, and the filter press is located downstream of the second vibrating screen.

[0013] Furthermore, the first pipeline includes at least one corner portion, and the side wall of the corner portion has a connecting hole connected to the outside, and a blocking member is installed in the connecting hole, and the blocking member is used to open or close the connecting hole.

[0014] Furthermore, the corner portion includes an air inlet pipe section and an air outlet pipe section, an angle is formed between the air inlet pipe section and the air outlet pipe section, and the connecting hole is arranged at the corner between the air inlet pipe section and the air outlet pipe section.

[0015] Furthermore, a first pipe is connected at a corner between the air inlet pipe section and the air outlet pipe section, and the communicating hole is arranged on the first pipe.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Additional aspects and advantages of the present invention will become apparent and easily understood from the description of the technical solution in conjunction with the following drawings, in which:

[0018] Figure 1 This is a schematic diagram of the structure of a system for recovering positive electrode materials from positive electrode sheets of a battery according to the technical solution of the utility model;

[0019] Figure 2 A schematic diagram of the structure of the corner portion after the blocking member opens the communicating hole;

[0020] Figure 3 This is a schematic structural diagram of the connection between the corner portion and the pyrolysis device of the first embodiment;

[0021] Figure 4 It is a schematic diagram of the structure of the corner portion after the blocking member closes the connecting hole;

[0022] Figure 5 This is a schematic structural diagram of the connection between the corner portion and the pyrolysis device of the second embodiment;

[0023] Figure 6 It is a structural schematic diagram of the exhaust gas treatment system;

[0024] Figure 7 It is a structural schematic diagram of the connection between the water washing tank and the solid-liquid separation device;

[0025] Figure 8 It is a structural schematic diagram in which a first disassembling device, a pyrolysis device, a second disassembling device and a screening assembly are connected in sequence.

[0026] Reference numerals:

[0027] The first disassembling device 100, the feeding hopper 110, the feeding belt 120, the cooling spiral 130, the pyrolysis device 200, the second disassembling device 300, the screening assembly 400, the first vibrating screen 410, the cyclone collector 420, the second fan 430, the second pipeline 440, the conveyor belt 450, the washing tank 500, the ultrasonic generator 510, the solid-liquid separation assembly 600, the solid-liquid separation device 610, the second vibrating screen 611, the filter press 612, the first storage tank 613, the first pump 614, the second storage tank 615, the second pump 616, the first pipeline 700, the corner portion 710, the connecting hole 720, the blocking member 730, the air inlet pipe section 740, the air outlet pipe section 750, the extension pipe section 760, the exhaust gas treatment system 800, the dust collector 810, the first fan 820, the spray tower 830, and the chimney 840. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is described in detail below, and examples of the technical solution are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The technical solution described below with reference to the accompanying drawings is exemplary and is only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] In the description of the utility model, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0031] Reference Figure 1 As shown, the technical solution of the utility model is as follows: a system for recovering positive electrode materials from positive electrode sheets of batteries includes: Figure 1 The system further comprises a first disassembling device 100, a pyrolysis device 200, a second disassembling device 300, a screening component 400, a washing tank 500 and a solid-liquid separation component 600 for performing solid-liquid separation on the mixed material after washing (in the left and right direction) connected in sequence, the screening component 400 is used to screen the crushed waste battery pole pieces and screen out the pole piece powder and aluminum foil, the washing tank 500 is equipped with an ultrasonic generator 510, and the washing tank 500 is used to wash the aluminum foil; the system also includes an exhaust gas treatment system 800 for dust recovery, and the exhaust gas treatment system 800 is connected to the first disassembling device 100, the pyrolysis device 200 and the second disassembling device 300 through a first pipeline 700.

[0032] The first disassembling device 100 is located upstream of the pyrolysis device 200, ensuring that the electrode can be broken into pieces before entering the pyrolysis device 200, so that the electrode can be pyrolyzed more fully. In addition, the initial crushing also helps the electrode powder to be more easily separated from the aluminum foil; the second disassembling device 300 is located downstream of the pyrolysis device 200. The second disassembling device 300 can further crush the electrode after pyrolysis, so that most of the electrode powder is separated from the aluminum foil, so that the screening component 400 can recover most of the electrode powder, the recovery rate can reach 80%, and the aluminum content in the electrode powder is less than 0.5%, thereby reducing the working pressure of the washing tank 500, thereby The total recovery rate (the total recovery rate refers to the electrode powder recovered by the screening component 400 + the remaining electrode powder recovered by subsequent water washing) can reach more than 87%; the separated aluminum foil can be ultrasonically washed through the washing tank 500, and cooperated with the solid-liquid separation component 600 to easily recover the remaining electrode powder in the aluminum foil, and no flammable and explosive hydrogen will be produced, which is safer and more reliable; by setting up the exhaust gas treatment system 800, the remaining electrode powder in the gas can be recovered, and it is combined with the recovery of the screening group and the recovery of the solid-liquid separation component, so that the system is divided into three parts to recover the electrode powder, thereby ensuring the recovery rate of the electrode powder and avoiding dust spillage.

[0033] Specifically, variable-frequency ultrasonic generators 510 are installed around the water washing tank 500 , and a stirring device is installed inside the water washing tank 500 to prevent the mixture in the water washing tank 500 from settling.

[0034] Furthermore, if Figure 1 As shown, the tail gas treatment system 800 includes a gas transport direction ( Figure 1 At least one dust collector 810 and a first fan 820 are connected in sequence (in the left and right directions).

[0035] For example, Figure 1 , 6 As shown, there can be two dust collectors 810, and the two dust collectors 810 can be a cyclone dust collector and a bag dust collector respectively. When working, the dust generated by the first disassembling device 100, the dust generated by the pyrolysis device 200, and the dust generated by the second disassembling device 300 are sucked into the exhaust gas treatment system 800 under the action of the first fan 820. The two dust collectors 810 filter the gas in turn, and the dust collectors 810 recycle and collect the dust collected by the gas. After filtering, the first fan 820 can transport the gas to the outside. Specifically, since harmful exhaust gas is generated during the pyrolysis process of the waste battery pole pieces, such as Figure 6As shown, the utility model is provided with a spray tower 830 between the last dust collector 810 and the first fan 820. The spray tower 830 can process the gas to make the gas meet the emission requirements and avoid waste gas pollution of the environment. The first fan 820 can transport the gas to the chimney 840 for emission.

[0036] Furthermore, if Figure 1 As shown, the screening assembly 400 includes a first vibrating screen 410 and a cyclone collector 420. The cyclone collector 420 is respectively connected to the discharge port of the second disassembling device 300, the feed port of the first vibrating screen 410 and the exhaust gas treatment system 800. A second fan 430 is connected between the cyclone collector 420 and the exhaust gas treatment system 800.

[0037] During operation, the material crushed by the second disassembling device 300 is transported to the cyclone collector 420 under the action of the second fan 430. The fan at the lower end of the cyclone collector 420 is turned on or off, so that the material with larger particles entering the cyclone collector 420 is separated from the gas under the action of its own gravity and settles to the lower end of the cyclone collector 420, and then falls into the first vibrating screen 410 for screening, and the gas is discharged into the exhaust gas treatment system 800 for treatment under the action of the first fan 820 and the second fan 430; by providing the cyclone collector 420 upstream of the first vibrating screen 410, the cyclone collector 420 can perform the initial screening of the crushed material, and the first vibrating screen 410 can perform the secondary screening of the crushed material, thereby reducing the working pressure of the first vibrating screen 410, and further improving the recovery rate of the recovered electrode powder, and at the same time avoiding the exhaust gas from being discharged from the discharge end of the first vibrating screen 410, thereby improving the safety performance of the entire system.

[0038] Furthermore, if Figure 1 As shown, it also includes a second pipeline 440, and the cyclone collector 420 is connected to the first pipeline 700 through the second pipeline 440. The second fan 430 is arranged on the second pipeline 440 to ensure that the first disassembling device 100, the pyrolysis device 200, the second disassembling device 300 and the cyclone collector 420 are all in a negative pressure state, and the conveying wind force of the second fan 430 and the exhaust wind force of the first fan 820 are independent of each other, so that the interference is small, so that the wind balance of the whole system is stable and the fluctuation is small, ensuring that the equipment will not leak powder or emit powder.

[0039] Furthermore, if Figure 1 As shown, the solid-liquid separation assembly 600 includes a plurality of sequentially connected solid-liquid separation devices 610. When there are a plurality of solid-liquid separation devices 610, the mixture after washing can be gradually separated into solid and liquid, thereby improving the recovery rate of the electrode powder.

[0040] Furthermore, if Figure 1As shown, the liquid outlet of the last solid-liquid separation device 610 is connected to the water inlet of the washing tank 500. Since the aluminum foil is washed with ultrasonic water, the main metal elements of the electrode powder are almost insoluble in the washing liquid. The filtrate produced by the solid-liquid separation device 610 can be returned to the washing tank 500 for multiple recycling, thereby reducing costs.

[0041] Specifically, when there is one solid-liquid separation device 610 (not shown in the figure), the feed port of the solid-liquid separation device 610 is connected to the discharge port of the water washing tank 500, and the liquid outlet of the solid-liquid separation device 610 is connected to the water inlet of the water washing tank 500, and the liquid after solid-liquid separation by the solid-liquid separation device 610 is directly transported to the water washing tank 500 for recycling; Figure 1 , 7 As shown, two solid-liquid separation devices 610 are provided, and the two solid-liquid separation devices 610 are respectively a second vibrating screen 611 and a filter press 612, the filter press 612 is located downstream of the second vibrating screen 611, the feed port of the second vibrating screen 611 is connected to the discharge port of the water washing tank 500, the discharge port of the second vibrating screen 611 is connected to the drying device, the liquid outlet of the second vibrating screen 611 is connected to the liquid inlet of the filter press 612, and the liquid outlet of the filter press 612 is connected to the water washing tank 500. The water inlet of the filter press 612 is connected, and the discharge port of the filter press 612 is connected to the external ton bag; when working, the mixed material discharged from the washing tank 500 enters the second vibrating screen 611 for solid-liquid separation, the screened material is aluminum foil, and the aluminum foil is packaged after drying, and the screened material is the washing liquid mixed with the electrode powder. The washing liquid enters the filter press 612 for filtration to obtain the electrode powder and the filtrate. The filtrate flows back to the washing tank 500 through the water inlet of the washing tank 500 for recycling, and the electrode powder is packaged in ton bags; Figure 7 As shown, preferably, a first storage tank 613 and a first pump 614 are provided between the second vibrating screen 611 and the filter press 612, and a second storage tank 615 and a second pump 616 are provided between the filter press 612 and the water inlet of the washing tank 500, so that the first storage tank 613 can temporarily store the liquid screened out by the second vibrating screen 611, and the second storage tank 615 can temporarily store the filtrate, and a stirring paddle can be installed in the first storage tank 613 to prevent the mixture in the first storage tank 613 from settling.

[0042] Furthermore, if Figure 1 As shown, the first pipe 700 includes at least one corner portion 710. Specifically, as shown in FIG. Figure 1 As shown at A and B in FIG. 1 , there are two corner portions 710 , corresponding to the first disassembling device 100 and the pyrolysis device 200 , respectively. It can be understood that the first pipeline 700 may have multiple corner portions 710 due to the limited space of the plant. Figure 1 This is just one example; Figure 1 , 2As shown in Figures 4 and 5, the side wall of the corner portion 710 has a connecting hole 720 connected to the outside, so that a large amount of air can enter the corner portion 710 from the connecting hole 720 under the action of the first fan 820, and then the gas entering the first pipe 700 can take away the ash at the corner and the ash settled on the straight section of the first pipe 700, thereby avoiding blockage of the first pipe 700. A blocking member 730 is installed in the connecting hole 720, and the blocking member 730 is used to open or close the connecting hole 720, so that the connecting hole 720 does not affect the normal operation of the system.

[0043] For example, Figure 1 , 3 As shown, the first pipeline 700 connected to the pyrolysis device 200 includes a corner portion 710. By providing a connecting hole 720 at the corner of the first pipeline 700, when dust cleaning is required, the user can drive the blocking member 730 to open the connecting hole 720 and operate the first fan 820 at maximum power, so that the gas in the pyrolysis device 200 is sucked into the first pipeline 700, and the external air enters the first pipeline 700 through the connecting hole 720. Since the first disassembling device 100 and the first pipeline 700 are also provided upstream of the pyrolysis device 200, they can be directly connected to the outside through the connecting hole 720, so that the gas in the pyrolysis device 200 enters the first pipeline 700. 0 is lower than the smoothness of external air entering the first pipe 700, so a large amount of air can enter the first pipe 700 through the connecting hole 720 and flow toward the first fan 820. During the gas flow, the gas can take away the ash at the corner of the first pipe 700 and the ash settled on the straight section of the first pipe 700, and be recovered to the exhaust gas treatment system 800, thereby avoiding blockage of the first pipe 700; when the connecting hole 720 does not need to be cleaned, the blocking member 730 can close the connecting hole 720, so that the gas generated by the pyrolysis device 200 can be normally processed by the exhaust gas treatment system 800 without affecting normal operation.

[0044] Furthermore, if Figure 2 As shown, the corner portion 710 includes an air inlet pipe section 740 and an air outlet pipe section 750 , an angle is formed between the air inlet pipe section 740 and the air outlet pipe section 750 , and the connecting hole 720 is arranged at the corner between the air inlet pipe section 740 and the air outlet pipe section 750 .

[0045] For example, Figure 1 , 3 As shown, the air inlet pipe section 740 is connected to the pyrolysis device 200, and the air outlet pipe section 750 is connected to the tail gas treatment system 800. During normal operation, the blocking member 730 closes the connecting hole 720, and the gas only enters from the air inlet pipe section 740 and then exits from the air outlet pipe section 750. Figure 3As shown, when dust cleaning is required, the blocking member 730 is driven to move and the connecting hole 720 is opened. The gas can enter from the air inlet pipe section 740 and the connecting hole 720 and then exit from the air outlet pipe section 750. Since the connecting hole 720 is located at the corner between the air inlet pipe section 740 and the air outlet pipe section 750, a large amount of wind can blow away the dust at the corner between the air inlet pipe section 740 and the air outlet pipe section 750, thereby preventing the first pipeline 700 from being blocked.

[0046] Furthermore, if Figure 2 , 4 As shown, an extension pipe section 760 is connected to the corner between the air inlet pipe section 740 and the air outlet pipe section 750, and the connecting hole 720 is arranged on the extension pipe section 760, that is, a pipe section is extended outward from the corner between the air inlet pipe section 740 and the air outlet pipe section 750 to ensure that the blocking member 730 can be driven, thereby ensuring that the connecting hole 720 can be opened, and making it easier for a large amount of wind to blow away the ash in the sedimentation pipe wall and the ash at the corner; specifically, the extension pipe section 760 is an integrated structure with the air inlet pipe section 740 or the air outlet pipe section 750, as shown in FIG. Figure 3 As shown, the outlet pipe section 750 is located between the two ends of the inlet pipe section 740, or, as shown in FIG. Figure 5 As shown, the air inlet pipe section 740 is located between the two ends of the air outlet pipe section 750 .

[0047] Furthermore, it also includes a control device (not shown in the figure), such as Figure 2 , 4 As shown, the blocking member 730 can be rotatably installed in the connecting hole 720, and the control device is used to drive the blocking member 730 to rotate. The blocking member 730 is circular in shape. When working, the blocking member 730 is controlled to rotate by the control device to automatically control the opening and closing of the connecting hole 720; specifically, the blocking member 730 can be a flap valve, and the control device can be an electromagnetic controller.

[0048] Specifically, Figure 8 As shown, a feeding hopper 110 and a feeding belt 120 are provided upstream of the first dismantling device 100, and a dust collecting port at the upper end of the feeding hopper 110 is connected to an exhaust gas treatment system 800 through a first pipe 700, so that the system is not connected to the outside during feeding, first crushing, pyrolysis and second crushing, so as to avoid dust discharge during the treatment process, which causes environmental pollution and further improves the recovery rate of recovered electrode powder; a cooling spiral 130 is provided between the pyrolysis device 200 and the second dismantling device 300; Figure 1 As shown, a conveyor belt 450 is provided between the first vibrating screen 410 and the washing tank 500; Figure 8 As shown, the first disassembling device 100 is a double-shaft shredder, and the end of the feed belt 120 extends into the interior of the double-shaft shredder; the first vibrating screen 410 can be a 60-mesh circular vibrating screen; Figure 8As shown, the pyrolysis device 200 is a rotary kiln, the feed port at the top of the front end of the rotary kiln is connected to the discharge port at the bottom of the double-shaft shredder, the end of the rotary kiln is connected to the feed port of the cooling spiral 130, and the discharge port of the cooling spiral 130 extends into the cavity of the hammer crusher; Figure 1 As shown, the discharge port of the first vibrating screen 410 is connected to a feed pipe, and a clamp is installed on the feed pipe. The clamp is used to clamp a ton bag, and the ton bag collects the electrode powder.

[0049] The system's working steps are:

[0050] 1. If Figure 8 As shown, a weight of 1 ton of waste lithium iron phosphate positive electrode sheets is put into the feeding hopper 110, and the materials are transported to the first dismantling device 100 through the feeding belt 120 for preliminary crushing, and the initial crushing into 30-50 mm flakes is then subjected to high-temperature pyrolysis, so that when it is heated in the pyrolysis device 200, it can be pyrolyzed more fully and the effect is better;

[0051] 2. The crushed materials automatically fall into the pyrolysis device 200 for pyrolysis. The pyrolysis conditions are: temperature 450°C, time 2h, to obtain pyrolysis pole pieces. Considering the composition of the pole pieces, high-temperature pyrolysis is used to remove the conductive agent and the binder, so that the adhesion between the pole piece powder and the current collector is greatly reduced, making it easier to fall off, which can greatly improve the powder collection rate and reduce the pressure of subsequent ultrasonic water washing to separate the pole piece powder and the current collector;

[0052] 3. The pyrolysis electrode is transported to the cooling spiral 130, and the cooling circulating water in the cooling spiral 130 cools the pyrolysis electrode;

[0053] 4. The cooled pyrolysis electrode is transported to the second disassembling device 300 by the cooling spiral 130 for crushing, and a large amount of electrode powder falls off from the aluminum foil. Specifically, when the pyrolysis electrode is hammered in the hammer crusher, a large amount of electrode powder will fall off from the current collector, and the recovery rate can reach 80%, and the aluminum content in the electrode powder is less than 0.5%. Combined with the subsequent water washing to recover the remaining electrode powder, the total recovery rate can reach more than 87% (the electrode powder in the incoming material accounts for about 88% of the total electrode);

[0054] 5. If Figure 1 As shown, the crushed material is transported to the cyclone collector 420 by the second fan 430, and a large amount of material falls into the first vibrating screen 410 for screening. The screened material falls into the ton bag due to its own weight. The screened material is 855.8 kg of pole piece powder, and the one-time powder recovery rate is 85.58%. The aluminum content in the pole piece powder is 0.099%, and the screened material is aluminum foil that has not completely shed the pole piece powder.

[0055] 6. The aluminum foil falls onto the conveyor belt 450, which conveys it to the water washing tank 500. The water washing tank 500 uses an ultrasonic generator 510 to wash the aluminum foil. Ultrasonic washing is used to treat the aluminum foil to avoid hydrogen production during acid washing, which is safer and more reliable.

[0056] 7. If Figure 7 As shown, the water outlet of the washing tank 500 is opened, and the mixed material after washing flows to the second vibrating screen 611 for solid-liquid separation. The material on the screen is aluminum foil, which is packaged after drying. The material under the screen is the washing liquid mixed with the electrode powder, and the washing liquid automatically flows into the first storage tank 613. The first pump 614 is turned on, and the first pump 614 conveys the washing liquid to the filter press 612 for filtration to obtain the electrode powder and the filtrate. The electrode powder is packaged in a ton bag, and the filtrate flows into the second storage tank 615. The second pump 616 conveys the filtrate to the return water washing tank 500 for multiple recycling. Among them, the final byproduct aluminum is a flake material with high safety.

[0057] 8. The gas generated by the hopper 110, the first disassembling device 100, the pyrolysis device 200, the second disassembling device 300, and the cyclone collector 420 is sucked into the tail gas treatment system 800 by the first fan 820, filtered by the dust collector 810 and the spray tower 830, and then discharged through the chimney 840. The dust collected by the dust collector 810 is packed in ton bags;

[0058] 9. Take samples of pole piece powder, dust collecting powder, aluminum slag and filtrate of each product for testing and obtain the test data;

[0059] After the above steps, the electrode powder can be effectively separated from the current collector, and finally 876.41 kg of electrode powder is obtained. The aluminum content in the electrode powder is 0.0986%, the electrode powder recovery rate is 87.64%, and the purity is 99.9%.

[0060] Although the technical solutions of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the technical solutions without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A system for recovering positive electrode material from a positive electrode sheet of a battery, characterized in that: The invention comprises a first disassembling device (100), a pyrolysis device (200), a second disassembling device (300), a screening component (400), a water washing tank (500) and a solid-liquid separation component (600) for performing solid-liquid separation on the mixed material after water washing, the screening component (400) being used to screen the crushed waste battery pole pieces and screen out pole piece powder and aluminum foil, the water washing tank (500) being equipped with an ultrasonic generator (510), and the water washing tank (500) being used to wash the aluminum foil; It also includes an exhaust gas treatment system (800) for dust recovery, wherein the exhaust gas treatment system (800) is connected to the first disassembling device (100), the pyrolysis device (200) and the second disassembling device (300) via a first pipeline (700).

2. The system for recovering positive electrode materials from positive electrode sheets of batteries according to claim 1, characterized in that: The exhaust gas treatment system (800) comprises at least one dust collector (810) and a first fan (820) which are sequentially connected along a gas conveying direction.

3. The system for recovering positive electrode materials from positive electrode sheets of batteries according to claim 1 or 2, characterized in that: The screening assembly (400) comprises a first vibrating screen (410) and a cyclone collector (420); the cyclone collector (420) is respectively connected to the discharge port of the second disassembling device (300), the feed port of the first vibrating screen (410) and the exhaust gas treatment system (800); and a second fan (430) is connected between the cyclone collector (420) and the exhaust gas treatment system (800).

4. The system for recovering positive electrode material from positive electrode sheets of a battery according to claim 3, characterized in that: It also includes a second pipeline (440), the cyclone collector (420) is connected to the first pipeline (700) through the second pipeline (440), and the second fan (430) is arranged on the second pipeline (440).

5. The system for recovering positive electrode materials from positive electrode sheets of batteries according to claim 1, characterized in that: The solid-liquid separation component (600) comprises a plurality of solid-liquid separation devices (610) connected in sequence.

6. The system for recovering positive electrode material from positive electrode sheets of a battery according to claim 5, characterized in that: The liquid outlet of the last solid-liquid separation device (610) is connected to the water inlet of the water washing tank (500).

7. The system for recovering positive electrode material from positive electrode sheets of a battery according to claim 5 or 6, characterized in that: The solid-liquid separation devices (610) are provided in two numbers, and the two solid-liquid separation devices (610) are respectively a second vibrating screen (611) and a filter press (612), and the filter press (612) is located downstream of the second vibrating screen (611).

8. The system for recovering positive electrode materials from positive electrode sheets of batteries according to claim 2, characterized in that: The first pipe (700) includes at least one corner portion (710), the side wall of the corner portion (710) has a connecting hole (720) connected to the outside, and a blocking member (730) is installed in the connecting hole (720), and the blocking member (730) is used to open or close the connecting hole (720).

9. The system for recovering positive electrode material from positive electrode sheets of a battery according to claim 8, characterized in that: The corner portion (710) comprises an air inlet pipe section (740) and an air outlet pipe section (750), an angle is formed between the air inlet pipe section (740) and the air outlet pipe section (750), and the connecting hole (720) is arranged at the corner between the air inlet pipe section (740) and the air outlet pipe section (750).

10. The system for recovering positive electrode materials from positive electrode sheets of batteries according to claim 9, characterized in that: An extension pipe section (760) is connected at the corner between the air inlet pipe section (740) and the air outlet pipe section (750), and the communication hole (720) is arranged on the extension pipe section (760).

Images