Lithium ion battery black powder reduction roasting furnace and method

Abstract

The invention belongs to the technical field of recovery devices, and particularly discloses a lithium ion battery black powder reduction roasting furnace and method.The lithium ion battery black powder reduction roasting furnace comprises a heating cavity, a rotating rod and a transmission rod are rotationally arranged on the heating cavity, a mounting rod is fixed between the rotating rod and the transmission rod, a plurality of mounting pipes are fixed to the mounting rod at equal intervals, and plow type paddles are fixed to the ends of the mounting pipes; a side plate is fixed on the plow-type blade, the side plate abuts against the inner wall of the heating cavity, a filter plate is fixed at the joint of the plow-type blade and the mounting pipe, a pore plate is fixed in the middle of the inner wall of the mounting pipe, a sliding rod penetrates through the pore plate, a balancing weight is fixed at one end, deviating from the filter plate, of the sliding rod, and a piston is fixed at one end, deviating from the balancing weight, of the sliding rod. And the caked black powder and the solid reducing agent are crushed through the plow-type blades, and meanwhile, the crushed black powder and the crushed solid reducing agent are driven to move, so that roasting reduction processing of the black powder in the heating cavity is realized.

Description

Technical Field

[0001] This invention belongs to the field of recycling equipment technology, and specifically discloses a lithium-ion battery black powder reduction roasting furnace and method. Background Technology

[0002] With the rapid development of electric vehicles and portable electronic devices, the use of lithium-ion batteries has increased dramatically, leading to a large-scale problem of disposing of waste lithium-ion batteries. Waste lithium-ion batteries contain abundant valuable metals, such as lithium, cobalt, nickel, and manganese, and have high recycling value. Among these, black powder (i.e., electrode material powder) is a key material in the recycling process, requiring reduction roasting to achieve the reduction of metal oxides and subsequent efficient extraction.

[0003] Currently, the reduction roasting of lithium-ion battery black powder mostly uses equipment such as fixed beds or rotary kilns. However, existing roasting equipment often has the following problems during the process: First, the black powder and solid reducing agent (such as carbon powder) are not mixed evenly, resulting in insufficient reduction reaction of the black powder; second, the black powder is prone to agglomeration, affecting the heat conduction and gas diffusion of the black powder, thereby reducing the reaction efficiency of the black powder; third, traditional stirring devices are prone to dust generation or wear on the inner wall of the equipment, affecting the life of the equipment and the operating environment.

[0004] Furthermore, the existing technologies for introducing gaseous reducing agents are relatively simple, often making it difficult to achieve sufficient contact with solid materials, which further limits the rate and completeness of the reduction reaction. Therefore, there is an urgent need to develop a reduction roasting apparatus and method that can achieve efficient mixing of black powder and reducing agent, prevent agglomeration, improve reaction efficiency, and reduce energy consumption. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a lithium-ion battery black powder reduction roasting furnace to solve the problems mentioned above.

[0006] To achieve the above objectives, the present invention provides a lithium-ion battery black powder reduction roasting furnace, including a heating chamber, a heating structure, a material inlet structure, and a stirring structure. Multiple mounting tubes are fixed at equal intervals on the stirring structure. Each mounting tube is a tubular structure sealed at one end. A plow-type blade is fixed to the end of the mounting tube, and a filter plate is fixed at the connection between the plow-type blade and the mounting tube. A side plate is fixed on the plow blade. The inner cavity of the mounting tube is connected to the inner cavity formed by the plow blade through the filter plate and the side plate. The side plate abuts against the inner wall of the heating chamber. A perforated plate is fixed in the middle of the inner wall of the mounting tube. A reciprocating pushing structure is connected to the perforated plate. The reciprocating pushing structure includes a piston. A slide rod passes through the perforated plate. A counterweight is fixed at the end of the slide rod away from the filter plate. The piston is fixed at the end of the slide rod away from the counterweight. A limit ring is fixed on the inner wall of the mounting tube. The limit ring abuts against the piston. The mounting tube and the plow blade are perpendicularly distributed. A jet nozzle is fixed in the middle of the heating chamber, and a gas supply pipe is fixed in the upper part of the heating chamber. Multiple nozzles are fixed on both the gas supply pipe and the jet nozzle. The discharge end of the nozzle is opposite to the filter plate, and the nozzles on the jet nozzle are distributed obliquely downward. When the stirring structure rotates, the plow-type blades drive the material to move, and at the same time, the counterweight drives the slide rod and piston to reciprocate in the mounting tube under the action of gravity, thereby periodically drawing in or discharging the gaseous reducing agent through the filter plate, realizing the forced dispersion and dynamic circulation of the gaseous reducing agent in the material layer.

[0007] In the above technical solution, the stirring structure further includes a rotating rod and a transmission rod rotating on the heating chamber, an installation rod fixed between the rotating rod and the transmission rod, an installation tube fixed on the installation rod, a support fixed at the lower part of the heating structure, a transmission motor fixed on the support, the output end of the transmission motor fixed to the transmission rod, and the cross-section of the plow blade is an isosceles triangular structure.

[0008] In the above technical solution, further, there are multiple mounting rods, which are evenly distributed between the rotating rod and the transmission rod, and the mounting rods have a U-shaped structure.

[0009] In the above technical solution, the material outlet structure further includes a first filling outlet and a second filling outlet fixed on the upper part of the heating chamber, a discharge outlet fixed at the lower end of the heating chamber away from the second filling outlet, and an exhaust outlet fixed on the upper part of the heating chamber.

[0010] In the above technical solution, the heating structure is further fitted outside the heating chamber, and the exhaust port, the first packing port, the second packing port, and the discharge port all penetrate the heating structure. The wiring terminal of the jet nozzle also penetrates the heating structure.

[0011] In the above technical solution, the jet nozzle and the gas delivery pipe have the same structure, and the outer ends of the gas delivery pipe and the jet nozzle pass through the heating structure.

[0012] In the above technical solution, the side of the plow blade near the side plate is inclined, and the surfaces of the plow blade and the side plate are both smooth.

[0013] A method for reducing black powder in lithium-ion batteries includes the following steps: S1. Filler: The treated recycled black powder is added to the interior of the heating chamber through the first filler port, and the solid reducing agent is added to the interior of the heating chamber through the second filler port. Then the heating structure is turned on to heat the heating chamber. S2. Stirring: Start the drive motor. The output shaft of the drive motor drives the mounting rod on the rotating rod to rotate through the transmission rod, so that the plow blades on the mounting rod can impact, crush and mix the black powder and solid reducing agent. S3. Reduction: During the mixing and crushing process of black powder and solid reducing agent, the black powder can continuously absorb heat from the inner wall of the heating chamber. Then, gaseous reducing agent is transported into the interior of the heating chamber through the gas supply pipe and the jet nozzle, so that the gaseous reducing agent works with the solid reducing agent to reduce the black powder.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. In actual use, the operator injects solid reducing agent, gaseous reducing agent and black powder recovered from lithium-ion batteries into the heating chamber in advance. The end of the transmission rod away from the mounting rod is connected to the transmission motor. When the transmission motor is working, the output shaft of the transmission motor can drive the mounting rod to rotate through the transmission rod. The mounting rod can drive the plow blades through the mounting tube to impact, crush and stir the solid reducing agent and black powder inside the heating chamber, thereby realizing the mixing of solid reducing agent and black powder, which facilitates the mixing of black powder and reducing agent.

[0015] 2. The tip of the plow blade in the roasting furnace can impact the black powder and solid reducing agent, thereby crushing the agglomerated black powder and solid reducing agent. At the same time, the plow blade can also drive the crushed black powder and solid reducing agent upward, realizing the rapid dispersion and mixing of black powder and solid reducing agent inside the heating chamber. When the black powder and solid reducing agent inside the heating chamber move, the installation pipe can drive the gaseous reducing agent inside the heating chamber to transport to the black powder, realizing the rapid reduction treatment of black powder inside the heating chamber.

[0016] 3. Both the jet nozzle and the gas delivery pipe in the roasting furnace can deliver gaseous reducing agent to the interior of the heating chamber. The jet nozzle is located on the side of the heating chamber where the plow blade rotates in the forward direction. When the mounting rod drives the plow blade to move from the jet nozzle to the gas delivery pipe, the gaseous reducing agent sprayed from the jet nozzle through the nozzle can blow away the solid reducing agent and black powder around the filter plate, thereby quickly separating the solid reducing agent and black powder from the plow blade. This prevents the solid reducing agent and black powder from clogging the filter plate and affecting the installation pipe's ability to draw gaseous reducing agent into the heating chamber. It also facilitates the transport of gaseous reducing agent inside the heating chamber by the installation pipe, thus achieving contact between the pulverized black powder and the gaseous reducing agent. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Cross-sectional structural diagram; Figure 3 This is a structural diagram showing the connection between the gas delivery pipe and the jet nozzle and the heating chamber in this invention; Figure 4 This is a structural diagram showing the connection between the filter plate, the plow-type impeller, and the mounting pipe in this invention. Figure 5 for Figure 2 Enlarged view of A in the middle; Figure 6 This is a diagram showing the connection structure between the mounting tube and the mounting rod in this invention; Figure 7 This is a schematic diagram showing the penetration of the slide bar and the perforated plate in this invention; Figure 8 This is a diagram showing the connection structure between the mounting pipe and the plow blade in this invention.

[0018] 1. Heating structure; 11. Gas supply pipe; 12. First packing port; 13. Second packing port; 14. Discharge port; 15. Support; 16. Exhaust port; 17. Air jet port; 18. Nozzle; 19. Heating chamber; 2. Drive motor; 3. Rotating rod; 31. Mounting rod; 32. Transmission rod; 4. Plow blade; 41. Side plate; 42. Filter plate; 5. Mounting pipe; 51. Piston; 52. Limiting ring; 53. Orifice plate; 54. Slide rod; 55. Counterweight. Detailed Implementation

[0019] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0021] Example 1: Please refer to Figures 1-8 As shown, the present invention provides a technical solution: The present invention is a lithium-ion battery black powder reduction roasting furnace, including a heating chamber 19, a heating structure 1, a material inlet structure and a stirring structure. Multiple mounting tubes 5 are fixed at equal intervals on the stirring structure. The mounting tubes 5 are tubular structures sealed at one end. A plow blade 4 is fixed at the end of the mounting tube 5. A filter plate 42 is fixed at the connection between the plow blade 4 and the mounting tube 5. A side plate 41 is fixed on the plow blade 4. The inner cavity of the mounting tube 5 is connected to the inner cavity formed by the plow blade 4 through the filter plate 42 and the side plate 41. The side plate 41 abuts against the inner wall of the heating chamber 19. A perforated plate 53 is fixed in the middle of the inner wall of the mounting tube 5. A reciprocating pushing structure is connected to the perforated plate 53. The reciprocating pushing structure includes a piston 51. A slide rod 54 passes through the perforated plate 53. A counterweight 55 is fixed at the end of the slide rod 54 away from the filter plate 42. The piston 51 is fixed at the end of the slide rod 54 away from the counterweight 55. A limit ring 52 is fixed on the inner wall of the mounting tube 5. The limit ring 52 abuts against the piston 51. The mounting tube 5 and the plow blade 4 are vertically distributed. A jet nozzle 17 is fixed in the middle of the heating chamber 19, and an air supply pipe 11 is fixed in the upper part of the heating chamber 19. Multiple nozzles 18 are fixed on both the air supply pipe 11 and the jet nozzle 17. The discharge end of the nozzle 18 is opposite to the filter plate 42, and the nozzles 18 on the jet nozzle 17 are distributed downward at an angle. The stirring structure includes a rotating rod 3 and a transmission rod 32 rotating on the heating chamber 19. An installation rod 31 is fixed between the rotating rod 3 and the transmission rod 32. An installation tube 5 is fixed on the installation rod 31. A support 15 is fixed at the lower part of the heating structure 1. A transmission motor 2 is fixed on the support 15. The output end of the transmission motor 2 is fixed to the transmission rod 32. When the stirring structure rotates, the plow blade 4 drives the material to move. At the same time, the counterweight 55 drives the slide rod 54 and the piston 51 to reciprocate in the installation tube 5 under the action of gravity, thereby periodically drawing in or discharging the gas reducing agent through the filter plate 42, realizing the forced dispersion and dynamic circulation of the gas reducing agent in the material layer. In actual use, the staff injects solid reducing agent, gaseous reducing agent and black powder recovered from lithium-ion batteries into the heating chamber 19 in advance. The end of the transmission rod 32 away from the mounting rod 31 is connected to the transmission motor 2. When the transmission motor 2 is working, the output shaft of the transmission motor 2 can drive the mounting rod 31 to rotate through the transmission rod 32. The mounting rod 31 can drive the plow blade 4 through the mounting tube 5 to impact, crush and stir the solid reducing agent and black powder inside the heating chamber 19, thereby achieving the mixing of solid reducing agent and black powder. According to the existing process of reducing and roasting lithium-ion battery recycled black powder, the stirring speed of the stirrer should not be too fast during the reduction and roasting of the recycled black powder. The stirring speed should be just enough to mix the black powder with the solid reducing agent or gaseous reducing agent. The advantage of this design is that it can avoid dust generation inside the roasting furnace and also avoid excessive wear on the inner wall of the roasting furnace. In order to achieve this process, the following structure is proposed.

[0022] Example 2: Please refer to Figures 1-8As shown, based on Embodiment 1, the present invention provides a technical solution. Unlike Embodiment 1, in this embodiment, the tip of the plow-type blade 4 can impact the black powder and solid reducing agent, thereby crushing the agglomerated black powder and solid reducing agent. At the same time, the plow-type blade 4 can also drive the crushed black powder and solid reducing agent upward, realizing the rapid dispersion and mixing of black powder and solid reducing agent inside the heating chamber 19. When the black powder and solid reducing agent inside the heating chamber 19 move, the mounting pipe 5 can drive the gaseous reducing agent inside the heating chamber 19 to be transported to the black powder, realizing the rapid reduction treatment of black powder inside the heating chamber 19.

[0023] When the black powder is reduced and roasted inside the heating chamber 19, the black powder will have a certain stickiness. As the black powder is heated inside the heating chamber 19, the stickiness of the black powder will gradually decrease, so that the black powder and solid reducing agent are distributed in the heating chamber 19 in a loose manner. In order to avoid a lot of black powder adhering to the filter plate 42, the plow blade 4 is in use with the side plate 41 abutting against the inner wall of the heating chamber 19. There are multiple mounting rods 31, which are evenly distributed between the rotating rod 3 and the transmission rod 32. The mounting rods 31 have a U-shaped structure. The plow blade 4 has an isosceles triangular cross-section. The mounting tube 5 is a tubular structure sealed at one end. The filter plate 42 is embedded in the open end of the mounting tube 5. The inner cavity of the mounting tube 5 is connected to the inner cavity formed by the plow blade 4 through the filter plate 42 and the side plate 41.

[0024] The material inlet structure includes a first filling inlet 12 and a second filling inlet 13 fixed on the upper part of the heating chamber 19. A discharge outlet 14 is fixed at the lower end of the heating chamber 19 away from the second filling inlet 13, and an exhaust outlet 16 is fixed on the upper part of the heating chamber 19. To ensure thorough mixing of the black powder with the solid reducing agent and the gaseous reducing agent, multiple mounting rods 31 are provided inside the heating chamber 19. Each mounting rod 31 is connected to multiple plow blades 4. When the mounting rod 31 drives the plow blades 4 to contact the black powder and the solid reducing agent, the tip of the plow blades 4 can impact the black powder and the solid reducing agent, thereby crushing the agglomerated black powder and the solid reducing agent. At the same time, the plow blades 4 can also drive the crushed black powder and the solid reducing agent to move upward, thereby rapidly dispersing and mixing the crushed black powder and the solid reducing agent. As the mounting rod 31 drives the plow blade 4 upward, the black powder and solid reducing agent inside the heating chamber 19 will also separate from the plow blade 4. At this time, the counterweight 55, the sliding rod 54 and the piston 51 can also move downward under the action of gravity. This can achieve a negative pressure state at the top of the mounting tube 5, thereby allowing the gaseous reducing agent inside the heating chamber 19 to enter the interior of the mounting tube 5, and then allowing the gaseous reducing agent above the heating chamber 19 to flow downward, so that the black powder driven upward by the plow blade 4 can contact the gaseous reducing agent flowing downward by the mounting tube 5. When the mounting rod 31 moves the plow blade 4 downward, the black powder and solid reducing agent inside the heating chamber 19 will also come into contact with the plow blade 4. At this time, the counterweight 55, the sliding rod 54 and the piston 51 can also move downward under the action of gravity, thereby causing the gaseous reducing agent inside the mounting tube 5 to be discharged, so as to achieve the mixing of the gaseous reducing agent and black powder inside the mounting tube 5.

[0025] Example 3: Please refer to Figures 1-8 As shown, based on Embodiment 1, the present invention provides a technical solution. Unlike Embodiment 1, in this embodiment, both the jet nozzle 17 and the gas delivery pipe 11 can deliver gaseous reducing agent to the interior of the heating chamber 19. The jet nozzle 17 is located on the side of the plow blade 4 rotating in the forward direction on the heating chamber 19. When the mounting rod 31 drives the plow blade 4 to move from the jet nozzle 17 to the gas delivery pipe 11, the gaseous reducing agent sprayed by the nozzle 18 through the jet nozzle 17 can blow away the solid reducing agent and black powder around the filter plate 42, thereby causing the solid reducing agent and black powder to quickly separate from the plow blade 4, avoiding the solid reducing agent and black powder from clogging the filter plate 42 and affecting the installation pipe 5's suction of the gaseous reducing agent in the heating chamber 19, thus facilitating the transport of the gaseous reducing agent inside the heating chamber 19 by the installation pipe 5.

[0026] The heating structure 1 is sleeved on the outside of the heating chamber 19. The exhaust port 16, the first packing port 12, the second packing port 13, and the discharge port 14 all penetrate the heating structure 1. The wiring terminal of the jet port 17 also penetrates the heating structure 1.

[0027] The jet nozzle 17 and the gas supply pipe 11 have the same structure, and the outer ends of the gas supply pipe 11 and the jet nozzle 17 pass through the heating structure 1.

[0028] The side of the plow blade 4 closest to the side plate 41 is an inclined surface, and both the plow blade 4 and the side plate 41 have a smooth surface structure. The processed recycled black powder is added to the interior of the heating chamber 19 through the first filling port 12, and the solid reducing agent is added to the interior of the heating chamber 19 through the second filling port 13. Then, the heating structure 1 is turned on to heat the heating chamber 19. When the black powder and the solid reducing agent are mixed and crushed inside the heating chamber 19, the black powder and the solid reducing agent can continuously absorb the heat from the inner wall of the heating chamber 19. Subsequently, the gas reducing agent is delivered to the interior of the heating chamber 19 through the gas pipe 11 and the jet port 17 by the external gas reducing agent delivery structure, so that the gas reducing agent works with the solid reducing agent to reduce the black powder. It should be noted that, in order to ensure the stable reduction of black powder inside the heating chamber 19, control valves need to be installed on the first filling port 12, the second filling port 13, the exhaust port 16, and the discharge port 14. When the black powder is reduced inside the heating chamber 19, the staff connects the air extraction structure to the exhaust port 16, so that the air extraction structure can draw in the exhaust gas inside the heating chamber 19 through the exhaust port 16.

[0029] Both the jet nozzle 17 and the gas delivery pipe 11 can deliver gaseous reducing agent to the interior of the heating chamber 19. The jet nozzle 17 is located on the side of the plow blade 4 that rotates in the forward direction on the heating chamber 19. When the mounting rod 31 drives the plow blade 4 to move from the jet nozzle 17 to the gas delivery pipe 11, the gaseous reducing agent sprayed by the nozzle 18 through the jet nozzle 17 can blow away the solid reducing agent powder and black powder around the filter plate 42, thereby causing the solid reducing agent and black powder to be quickly separated from the plow blade 4, avoiding the solid reducing agent and black powder from clogging the filter plate 42 and affecting the installation pipe 5 to draw gaseous reducing agent into the heating chamber 19, thus facilitating the transport of gaseous reducing agent inside the heating chamber 19 by the installation pipe 5.

[0030] A method for reducing black powder in lithium-ion batteries includes the following steps: S1. Filler: The treated recycled black powder is added to the interior of the heating chamber 19 through the first filler port 12, and the solid reducing agent is added to the interior of the heating chamber 19 through the second filler port 13. Then the heating structure 1 is turned on to heat the heating chamber 19. S2. Stirring, start the drive motor 2 to work, the output shaft of the drive motor 2 drives the mounting rod 31 on the rotating rod 3 to rotate through the drive rod 32, so that the plow blade 4 on the mounting rod 31 can impact, crush and mix the black powder and solid reducing agent. S3. Reduction: During the mixing and crushing process of black powder and solid reducing agent, the black powder can continuously absorb heat from the inner wall of the heating chamber 19. Then, gaseous reducing agent is transported into the heating chamber 19 through the gas supply pipe 11 and the jet nozzle 17, so that the gaseous reducing agent works with the solid reducing agent to reduce the black powder.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A lithium ion battery black powder reduction roaster, comprising a heating cavity (19), a heating structure (1), a charging port structure and a stirring structure, characterized in that: A plurality of installation pipes (5) are fixed on the stirring structure at equal intervals, the installation pipe (5) is a tubular structure with one end sealed, the end of the installation pipe (5) is fixed with a plow blade (4), and the part where the plow blade (4) and the installation pipe (5) are connected is fixed with a filter plate (42); The inner cavity of the installation pipe (5) is communicated with the inner cavity formed by the plow blade (4), the filter plate (42) and the side plate (41), the side plate (41) abuts against the inner wall of the heating cavity (19), the middle part of the inner wall of the installation pipe (5) is fixed with a hole plate (53), the hole plate (53) is connected with a reciprocating pushing structure, the reciprocating pushing structure comprises a piston (51), the hole plate (53) penetrates the slide rod (54), one end of the slide rod (54) away from the filter plate (42) is fixed with a counterweight (55), the piston (51) is fixed at one end of the slide rod (54) away from the counterweight (55), the inner wall of the installation pipe (5) is fixed with a limiting ring (52), the limiting ring (52) abuts against the piston (51), and the installation pipe (5) and the plow blade (4) are vertically distributed. The middle part of the heating cavity (19) is fixed with a gas injection port (17), the upper part of the heating cavity (19) is fixed with a gas conveying pipe (11), a plurality of spray heads (18) are fixed on the gas conveying pipe (11) and the gas injection port (17), the discharge end of the spray head (18) is opposite to the filter plate (42), and the spray heads (18) on the gas injection port (17) are inclined downward. When the stirring structure rotates, the plow blade (4) moves with the material, and at the same time, the counterweight (55) drives the slide rod (54) and the piston (51) to reciprocate in the installation pipe (5) under the action of gravity, so as to periodically suck or discharge the gas reducing agent through the filter plate (42), so as to realize the forced dispersion and dynamic circulation of the gas reducing agent in the material layer.

2. The lithium ion battery black powder reduction roaster of claim 1, wherein, The stirring structure comprises a rotating rod (3) and a transmission rod (32) rotating on the heating cavity (19), a mounting rod (31) is fixed between the rotating rod (3) and the transmission rod (32), the installation pipe (5) is fixed on the mounting rod (31), the lower part of the heating structure (1) is fixed with a support (15), the support (15) is fixed with a transmission motor (2), the output end of the transmission motor (2) is fixed with the transmission rod (32), and the cross section of the plow blade (4) is an isosceles triangular structure.

3. The lithium-ion battery black powder reduction roaster of claim 2, wherein, A plurality of mounting rods (31) are distributed, and the plurality of mounting rods (31) are distributed at equal intervals between the rotating rod (3) and the transmission rod (32), and the mounting rod (31) is a U-shaped structure.

4. The lithium-ion battery black powder reduction roaster of claim 3, wherein, The material port structure comprises a first filling port (12) and a second filling port (13) fixed on the upper part of the heating cavity (19), the lower part of the heating cavity (19) is fixed with a discharge port (14) away from the second filling port (13), and the upper part of the heating cavity (19) is fixed with an exhaust port (16).

5. The lithium-ion battery black powder reduction roaster of claim 4, wherein the reduction roaster is characterized by: The heating structure (1) is sleeved outside the heating cavity (19), the exhaust port (16), the first filler port (12), the second filler port (13), the discharge port (14) are all penetrated by the heating structure (1), and the wiring end of the air jet port (17) is also penetrated by the heating structure (1).

6. The lithium-ion battery black powder reduction roaster of claim 5, wherein the reduction roaster is characterized by: The air jet port (17) and the gas conveying pipe (11) are of the same structure, and the external connecting end of the gas conveying pipe (11) and the air jet port (17) penetrates the heating structure (1).

7. The lithium-ion battery black powder reduction roaster of claim 6, wherein the reduction roaster is characterized by: The side of the plough blade (4) close to the side plate (41) is a slope, and the surfaces of the plough blade (4) and the side plate (41) are smooth structures.

8. A method for reducing lithium-ion battery black powder, using the lithium-ion battery black powder reduction roaster of claim 7, characterized in that, The method comprises the following steps: S1, filling, adding the treated recycled black powder into the inside of the heating cavity (19) through the first filler port (12), and adding the solid reducing agent into the inside of the heating cavity (19) through the second filler port (13), and then starting the heating structure (1) to heat the heating cavity (19); S2, stirring, starting the transmission motor (2) to work, and the output shaft of the transmission motor (2) drives the installation rod (31) on the rotating rod (3) to rotate through the transmission rod (32), so as to realize the impact, crushing and mixing of the plough blade (4) on the installation rod (31) on the black powder and the solid reducing agent; S3, reduction, in the process of mixing and crushing, the black powder and the solid reducing agent can continuously absorb the heat of the inner wall of the heating cavity (19), and then the gas reducing agent is conveyed into the inside of the heating cavity (19) through the gas conveying pipe (11) and the air jet port (17), so as to make the gas reducing agent cooperate with the solid reducing agent to reduce the black powder.

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