Continuous rotary furnace for producing battery negative electrode material

Abstract

The invention relates to the technical field of lithium ion battery material preparation equipment, in particular to a battery negative electrode material production continuous rotary furnace which comprises a furnace body module, a segmented temperature control heating module and a spiral material guide adjusting module, a wear-resistant ceramic coating is arranged on the inner wall of a rotary furnace cylinder, and the rotary furnace cylinder is divided into multiple segments such as preheating, carbonization and heat preservation in the axial direction; a high-temperature-resistant partition plate is arranged between every two adjacent sections to achieve temperature zone isolation, an independent electric heating unit is arranged on the outer side of each section and matched with an infrared temperature measuring sensor and a temperature controller to achieve precise closed-loop temperature control, and a spiral conveying paddle penetrates through a feeding hopper, a furnace barrel and a discharging bin and is driven by a spiral motor to achieve constant-speed continuous conveying of materials. The inner barrel of the rotary furnace barrel is in meshing transmission with a reduction gear driven by a driving motor through a rotary gear ring, and operation is stable and reliable. The outer cylinder is provided with a fixed base and an expansion bolt to adapt to thermal expansion and cold contraction. The feeding bin and the discharging bin are both provided with exhaust pipes, volatile gas is exhausted in time, and the device is suitable for efficient and stable carbonization production of lithium ion battery cathode materials.

Description

Technical Field

[0001] This invention relates to the field of lithium-ion battery material preparation equipment technology, specifically a continuous rotary furnace for producing battery anode materials. Background Technology

[0002] Traditional rotary kilns often employ overall heating or simple zoned temperature control, where heat from different zones easily interferes with each other. This makes it difficult to accurately achieve the multi-stage process requirements of preheating, high-temperature carbonization, heat preservation, and gradient cooling, resulting in uneven material structure and large fluctuations in yield. Furthermore, furnace temperature monitoring relies heavily on external thermocouples, which are slow and difficult to monitor in real time, impacting product quality consistency.

[0003] Existing equipment mostly operates intermittently or semi-continuously, with materials sliding down due to the furnace's tilt and gravity. This uncontrollable propulsion speed easily leads to accumulation or dry burning, resulting in low production efficiency. The furnace cylinder inner wall is generally made of ordinary heat-resistant steel, which is prone to wear and corrosion over long-term operation, contaminating materials and shortening equipment lifespan. Furthermore, traditional rotary kilns are driven by rollers or rings, resulting in complex transmission structures, poor operational stability, and significant vibration, affecting sealing and thermal uniformity. The lack of effective venting design at the feed and discharge ends prevents timely removal of volatiles generated during the reaction, posing safety hazards. Summary of the Invention

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a continuous rotary kiln for producing battery anode materials.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: A continuous rotary kiln for producing battery negative electrode materials, comprising: The furnace body module includes a rotary furnace cylinder, a feed hopper, and a discharge bin. The feed hopper is connected to the feed end of the rotary furnace cylinder via a flange, and the discharge bin is connected to the discharge end of the rotary furnace cylinder via a flange. The inner wall of the rotary furnace cylinder is provided with a wear-resistant ceramic coating, and the outer side of the discharge bin is provided with a discharge pipe, which is equipped with an electric valve. The segmented temperature control heating module surrounds the outside of the rotary furnace cylinder. The segmented temperature control heating module includes several independent heating units, infrared temperature sensors, and temperature controllers. The independent heating units are distributed along the axial direction of the rotary furnace cylinder. Each independent heating unit uses an electric heating wire. The detection end of the infrared temperature sensor extends into the interior of the rotary furnace cylinder. The temperature controller is electrically connected to the independent heating units and the infrared temperature sensors. The spiral material guiding adjustment module includes a spiral motor and a spiral conveying paddle. The spiral conveying paddle is rotatably installed inside the feed hopper, the rotary furnace cylinder, and the discharge hopper. The spiral motor is located outside the feed hopper. The output end of the spiral motor is connected to a geared motor. The output end of the geared motor is connected to the spiral conveying paddle through a coupling.

[0006] Preferably, the rotary kiln cylinder is distributed along the kiln cylinder axis with a preheating cylinder section, a carbonization cylinder section and a heat preservation cylinder section. The preheating cylinder section includes a low temperature preheating cylinder section and a medium temperature cylinder section, and the carbonization cylinder section includes a high temperature cylinder section and a cooling transition cylinder section.

[0007] More preferably, the rotary kiln cylinder is provided with a plurality of partitioned temperature control cylinder sections, and the partitioned temperature control cylinder sections are located between each adjacent cylinder section, and the partitioned temperature control cylinder sections are made of high temperature resistant partitions.

[0008] Preferably, the low-temperature preheating cylinder section, the medium-temperature cylinder section, the high-temperature cylinder section, the cooling transition cylinder section, and the heat preservation cylinder section all include an outer cylinder and an inner cylinder. A heating layer is provided between the outer cylinder and the inner cylinder. The independent heating unit is located in the heating layer and is fixedly installed on the inner side of the outer cylinder. Guide grooves are provided at both ends of the outer cylinder. Annular grooves are provided on both sides of the temperature-controlled isolation cylinder section. The two ends of the inner cylinder are rotatably connected to the guide grooves and the annular grooves through sealing rings.

[0009] Preferably, the bottom of the outer cylinder is provided with a fixed base, and a number of expansion bolts pass through the fixed base.

[0010] More preferably, the outer cylinder has two sections, and a rotating opening is provided between the two sections of the outer cylinder. A rotating gear ring is fixedly installed on the inner cylinder, and the rotating gear ring is located at the rotating opening. The system also includes a drive motor, which is located below the outer cylinder. A reduction gear is installed at the output end of the drive motor, and the reduction gear meshes with the rotating gear ring.

[0011] Preferably, the outer cylinder is provided with a collar at its end, and the rotating toothed ring is provided with annular grooves on both sides, with the collar fitting into the annular grooves.

[0012] Preferably, both the feed hopper and the discharge hopper are equipped with exhaust pipes, and the exhaust pipes are equipped with exhaust valves.

[0013] (III) Beneficial Effects Compared with the prior art, the present invention provides a continuous rotary kiln for producing battery anode materials, which has the following beneficial effects: This technical solution includes functional sections for preheating, carbonization, and insulation, which, together with high-temperature resistant baffles, achieve physical isolation between temperature zones to prevent heat crosstalk. The inner wall is coated with a wear-resistant ceramic coating, significantly extending the furnace cylinder's service life and reducing material contamination.

[0014] The segmented temperature control heating module uses multiple independent electric heating units, combined with infrared temperature sensors and temperature controllers, to achieve precise closed-loop temperature control in each temperature zone, meeting the gradient temperature rise requirements of the anode material carbonization process.

[0015] The spiral feeding adjustment module drives the spiral conveyor paddle with a spiral motor, which, in conjunction with a geared motor, achieves uniform material propulsion. The entire process—feeding, furnace operation, and discharging—is continuous, improving production efficiency. The rotary furnace drum is driven by a motor that rotates a gear ring, which meshes with a reduction gear to achieve stable rotation of the entire drum, enhancing material tumbling and mixing, and improving heating uniformity.

[0016] The outer cylinder is equipped with a fixed base and expansion bolts to accommodate thermal expansion and contraction at high temperatures. Both the feed hopper and discharge hopper are equipped with exhaust pipes to promptly discharge reaction gases and ensure system safety. This device enables continuous and intelligent production of the anode material carbonization process, resulting in good product consistency, low energy consumption, and suitability for large-scale manufacturing of lithium-ion battery anode materials. Attached Figure Description

[0017] Figure 1 This is a top view of one side of the feed hopper structure of the present invention; Figure 2 This is a bottom view of the structure of the discharge hopper of the present invention; Figure 3 This is a cross-sectional view of the low-temperature preheating cylinder section and a schematic diagram of part of the spiral conveyor section of the present invention; In the diagram: 1. Feed hopper; 2. Discharge bin; 3. Screw motor; 4. Gear motor; 5. Low-temperature preheating section; 6. Medium-temperature section; 7. High-temperature section; 8. Cooling transition section; 9. Insulation section; 10. Isolation temperature control section; 11. Outer cylinder; 12. Inner cylinder; 13. Electric heating wire; 14. Infrared temperature sensor; 15. Temperature controller; 16. Sealing ring; 17. Rotating gear ring; 18. Reduction gear; 19. Drive motor; 20. Collar; 21. Fixed base; 22. Screw conveyor; 23. Discharge pipe; 24. Electric valve; 25. Exhaust pipe; 26. Exhaust valve. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figure 1-3 The present invention provides a continuous rotary kiln for producing battery negative electrode materials, comprising: The furnace body module includes a rotary furnace cylinder, a feed hopper 1, and a discharge bin 2. The feed hopper 1 is connected to the feed end of the rotary furnace cylinder through a flange, and the discharge bin 2 is connected to the discharge end of the rotary furnace cylinder through a flange. The inner wall of the rotary furnace cylinder is provided with a wear-resistant ceramic coating, and the outer side of the discharge bin 2 is provided with a discharge pipe 23. An electric valve 24 is provided on the discharge pipe 23. The segmented temperature control heating module surrounds the outside of the rotary furnace cylinder. The segmented temperature control heating module includes several independent heating units, an infrared temperature sensor 14, and a temperature controller 15. The independent heating units are distributed along the axial direction of the rotary furnace cylinder. Each independent heating unit uses an electric heating wire 13. The detection end of the infrared temperature sensor 14 extends into the interior of the rotary furnace cylinder. The temperature controller 15 is electrically connected to the independent heating units and the infrared temperature sensor 14. The spiral material guiding adjustment module includes a spiral motor 3 and a spiral conveying paddle 22. The spiral conveying paddle 22 is rotatably installed inside the feed hopper 1, the rotary furnace cylinder and the discharge bin 2. The spiral motor 3 is located outside the feed hopper 1. The output end of the spiral motor 3 is connected to a geared motor 4. The output end of the geared motor 4 is connected to the spiral conveying paddle 22 through a coupling.

[0020] This technical solution provides differentiated reaction spaces through segmented preheating, carbonization, and insulation of the furnace module, while the wear-resistant coating on the inner wall ensures the equipment's lifespan. The segmented temperature control heating module provides each segment with an independent heating and temperature measurement system for precise temperature control. The spiral material guiding adjustment module drives the spiral conveyor 22 via a reduction gear transmission, controlling the continuous movement and residence time of the material. High-temperature resistant partitions and sealing structures in the temperature-controlled segment 10 prevent cross-regional thermal interference, ensuring stable temperatures in each segment. The drive module rotates the inner cylinder 12, working in conjunction with the spiral conveyor 22 to achieve uniform material tumbling and heating. Simultaneously, the exhaust pipes 25 of the feed and discharge hoppers 2 collect exhaust gases, preventing pollution and abnormal pressure, ultimately achieving efficient and high-quality continuous production of negative electrode materials.

[0021] The furnace body module is the core carrier for high-temperature material treatment. Through segmented cylindrical design and sealed protection, it adapts to the needs of different process stages. The specific principle is as follows: The rotary kiln cylinder is divided along the axial direction into a low-temperature preheating section 5 → a medium-temperature section 6 → a high-temperature section 7 → a cooling transition section → a heat preservation section 9. The function of each section is precisely matched with the process requirements. Low-temperature preheating section 5, such as 300-500℃, removes moisture and low-boiling-point impurities from the material, such as residual solvents in the negative electrode precursor, to prevent moisture evaporation during subsequent high-temperature treatment, which could lead to material cracking. The intermediate temperature cylinder section 6, such as 800-1200℃, achieves preliminary carbonization of materials, such as the construction of the carbon skeleton of graphite precursors, laying the foundation for high-temperature graphitization. High-temperature section 7, such as 1800-3000℃, is the core reaction zone, where deep graphitization is completed to improve the conductivity of the material or modify silicon-based materials, such as silicon-carbon composites. The cooling transition section, such as 1000-1800℃, gradually reduces the material temperature, relieves thermal stress, and avoids internal cracking of the material caused by direct cooling from high temperature. The insulation section 9, at 800-1000℃, stabilizes the crystal structure of the material and ensures uniform performance of the negative electrode material.

[0022] The length of each cylinder section is designed according to the proportion of material residence time. For example, the high-temperature cylinder section 7 accounts for 30% of the total processing time, ensuring that each process stage reacts fully.

[0023] The wear-resistant ceramic coating on the inner wall, such as Al2O3, and the negative electrode material, such as graphite powder, are prone to wear on the furnace wall when moving inside the cylinder. This coating can reduce the wear rate of the furnace cylinder by 90% and at the same time reduce the dissolution of metal ions, thus avoiding affecting the purity of the materials. The feed hopper 1 and discharge bin 2 are connected to the furnace cylinder via flanges. High-temperature resistant fluororubber gaskets are installed between the flange faces and tightened with bolts to ensure that there is no dust overflow or high-temperature gas leakage during feeding / discharging. The discharge pipe 23 outside the discharge hopper 2 is equipped with an electric valve 24, which can precisely control the opening and closing degree according to the material discharge speed. For example, intermittent discharge can avoid accumulation, and the valve can be closed when the equipment is stopped to prevent outside air from entering and contaminating the residual material.

[0024] The segmented temperature control heating module is the core of achieving precise temperature control for each section of the cylinder. Through independent heating units and segmented design, it avoids cross-zone thermal interference. The specific principle is as follows: A heating layer is provided between the outer cylinder 11 and the inner cylinder 12 of each section. The independent heating unit uses an electric heating wire 13 fixed to the inside of the outer cylinder 11 and is configured differently according to the temperature requirements of each section. The low-temperature / medium-temperature cylinder section 6 uses a nickel-chromium alloy electric heating wire 13, and the temperature is finely adjusted by regulating the current through a temperature controller 15. The high-temperature section 7 uses molybdenum wire electric heating wire 13 to meet the high-temperature requirements of deep graphitization; Each heating unit is individually electrically connected to the temperature controller 15. For example, if the temperature of the high-temperature section 7 is lower than the set value, such as 2800℃, the temperature controller 15 will only increase the power of the heating wire in that section, without affecting other sections, thus ensuring that the temperature of each area is independent and stable.

[0025] High-temperature resistant baffles are installed between adjacent cylinder sections, preferably made of graphite. The working principle is as follows: The graphite partition has a low thermal conductivity, which can control the heat transfer between adjacent cylinder sections to ≤5W / m². For example, between the high-temperature cylinder section of 72800℃ and the cooling transition cylinder section of 2000℃, the partition can keep the temperature difference between the two sections stable at 800℃ with no obvious thermal crosstalk. The high-temperature resistant partition has annular grooves on both sides. The inner cylinder 12 is rotatably connected to the annular grooves and the guide grooves of the outer cylinder 11 through sealing rings 16, such as graphite braided strips, at both ends. This ensures that the inner cylinder 12 rotates smoothly and blocks the flow of hot air through the gap between the cylinder sections, further suppressing thermal convection interference.

[0026] The spiral feeding adjustment module enables continuous material movement and precise residence time control within the segmented drum section. The specific principle is as follows: The high-speed power output from the screw motor 3 is reduced in speed and increased in torque by the geared motor 4, and then drives the screw conveyor 22 to rotate through the coupling: The pitch of the screw conveyor 22 is designed according to the function of the cylinder section. For example, the pitch of the high-temperature cylinder section 7 is 20cm, which slows down the material movement speed and extends the residence time; the pitch of the low-temperature preheating cylinder section 5 is 30cm, which speeds up the feeding efficiency. The material moves axially along each section of the cylinder under the push of the screw conveyor 22. At the same time, the inner cylinder 12 rotates to continuously tumble the material, avoiding uneven heating in some areas, such as under-burning caused by material accumulation, and improving the uniformity of heating.

[0027] By adjusting the combination of the rotational speed and pitch of the screw conveyor 22, the material residence time can be infinitely adjusted. The spiral motor 3 changes its rotation speed through the geared motor 4 to adapt to the different needs of silicon-based materials and graphite materials; Different helical blades with different pitches can be used in different sections of the cylinder. For example, small pitch blades are used in the high-temperature cylinder section 7 to ensure that the residence time of each process stage matches the reaction requirements. There is no need to replace the entire helical structure, which reduces operating costs.

[0028] The drive module provides power for the rotation of the inner cylinder 12, while the fixed base 21 and collar 20 structure ensure the stability of the equipment. The specific principle is as follows: The power output from the drive motor 19 is reduced in speed by the reduction gear 18 and then meshes with the rotating gear ring 17 on the inner cylinder 12. The rotating gear ring 17 is fixed at the rotation port of the inner cylinder 12, and the reduction gear 18 drives the inner cylinder 12 to rotate, which, together with the screw conveyor 22, enables the material to be turned over. The collar 20 at the end of the outer cylinder 11 is embedded in the annular grooves on both sides of the rotating toothed ring 17, which not only restricts the axial displacement of the inner cylinder 12 and avoids misalignment of the cylinder section, but also reduces the radial runout during rotation, ensuring the stable rotation of the inner cylinder 12.

[0029] The fixing base 21 at the bottom of the outer cylinder 11 is fixed to the ground by expansion bolts, such as M16-M20. The expansion bolts penetrate ≥100mm into the ground, which can withstand the overall weight of the furnace body and the radial force generated by the rotation of the inner cylinder 12, thus preventing the equipment from shaking during operation. A shock-absorbing pad is installed between the base and the outer cylinder 11 to absorb the vibration generated by the rotation of the inner cylinder 12 and prevent the heating unit and temperature sensor from shifting due to vibration.

[0030] The exhaust pipes 25 on the feed hopper and discharge hopper 2 are crucial for ensuring process safety and environmental protection. The specific principle is as follows: High-temperature processing of negative electrode materials generates harmful exhaust gases such as tar and benzene. Exhaust pipe 25 is connected to the top of the feed hopper and the discharge hopper 2 respectively. Feed hopper exhaust pipe 25: collects moisture and low-boiling-point impurities volatilized during the low-temperature preheating stage to prevent gas from accumulating in the hopper and causing pressure to rise; Discharge hopper 2 exhaust pipe 25: collects the trace amount of exhaust gas remaining during the heat preservation stage to prevent exhaust gas from being discharged with the finished product and polluting the environment; Downstream of exhaust pipe 25, an exhaust gas treatment system, such as a high-temperature incinerator and activated carbon adsorption tower, can be connected to effectively remove harmful substances and meet environmental protection standards.

[0031] Pressure balance: ensuring process stability Exhaust pipe 25 regulates the exhaust volume through a control valve to maintain a slightly negative pressure environment inside the furnace. To prevent excessive pressure inside the furnace from causing high-temperature gas to leak from the flange seal and to prevent burns to operators; When no material is added, the inlet of the feed hopper 1 is sealed with a sealing cap to prevent outside air from entering the furnace and ensure the stability of the negative electrode material performance.

[0032] Detailed Workflow Phase 1: Equipment Pre-processing and Parameter Setting Check the sealing rings 16 and flange gaskets of each cylinder section to ensure they are intact and undamaged; confirm that the screw conveyor 22 and the inner cylinder 12 are not stuck, and that the rotating gear ring 17 and the reduction gear 18 are meshing normally. Check the connection status between the independent heating unit and the infrared temperature sensor 14 to ensure accurate temperature measurement; Connect the exhaust pipe 25 of the feed hopper and discharge hopper to the exhaust gas treatment system, and open the exhaust valve 26 to ensure that the exhaust gas passage is unobstructed.

[0033] The temperature controller 15 sets the temperature of each cylinder section, such as 5400℃ for the low-temperature preheating cylinder section, 61000℃ for the medium-temperature cylinder section, 72800℃ for the high-temperature cylinder section, 2000℃ for the cooling transition cylinder section, and 9900℃ for the heat preservation cylinder section. The temperature controller 15 in this technical solution can adopt the existing technical structure, such as the Shimaden SR93 series high-precision PID temperature controller 15. Set the drive motor 19 speed to 10 r / min, the inner cylinder 12 rotation speed, the screw motor 3 speed to 8 r / min, and the screw conveyor 22 speed, corresponding to a total residence time of 2 hours; Set the opening and closing cycle of the electric valve 24 on the discharge pipe 23, such as opening once every 5 minutes, with each opening lasting 30 seconds, to match the discharge speed.

[0034] Phase 2: Feeding and Low-Temperature Preheating Add artificial graphite precursor powder to feed hopper 1, start screw motor 3 and geared motor 4, and screw conveyor 22 to uniformly feed the material into low temperature preheating cylinder section 5. During the feeding process, the exhaust pipe 25 of the feed hopper continuously collects the volatilized moisture and low-boiling-point impurities. The exhaust gas is treated and discharged in compliance with standards. At the same time, a slight negative pressure is maintained inside the hopper to prevent dust from overflowing.

[0035] The independent heating unit of the low-temperature preheating cylinder section 5 is started, the electric heating wire 13 heats to 400℃, the infrared temperature sensor 14 monitors the temperature in real time, and the temperature controller 15 automatically adjusts the power. If the temperature is lower than 395℃, the power is increased to ensure temperature stability. The inner cylinder 12 rotates at a speed of 10 r / min, and the screw conveyor 22 pushes the material to move. The material is continuously turned over in the cylinder to remove moisture and avoid cracking during subsequent high-temperature treatment.

[0036] Stage 3: Intermediate-temperature carbonization and high-temperature graphitization The preheated material enters the medium-temperature cylinder section 6 via the screw conveyor 22. The independent heating unit heats it to 1000℃. The infrared temperature sensor 14 provides real-time temperature feedback. The temperature controller 15 maintains a stable temperature. The infrared temperature sensor 14 can be installed on the outer cylinder 11, and the detection end is used to sense the temperature of the outer cylinder 11. The infrared temperature sensor 14 can adopt existing technology structures, such as an MCT detector. The material undergoes preliminary carbonization in a medium-temperature environment, forming a preliminary carbon skeleton. Small molecule gases, such as CO2, generated during the carbonization process enter the exhaust pipe 25 through the gap between the cylinder sections, preventing accumulation inside the cylinder.

[0037] High-temperature graphitization The carbonized material enters the high-temperature section 7, where the molybdenum wire heating unit heats it to 2800℃. The high-temperature resistant partition of the temperature-controlled section 10 blocks heat conduction, ensuring a stable temperature difference of 800℃ between the high-temperature zone and the medium-temperature zone. The inner cylinder 12 rotates in conjunction with the screw conveyor 22, so that the material is in uniform contact with the high temperature environment and completes deep graphitization. During high-temperature processes, exhaust pipe 25 continuously collects tar and benzene-based exhaust gases to prevent pollution and abnormal pressure.

[0038] Phase 4: Cooling Transition and Thermal Stabilization After graphitization, the material enters the cooling transition section. The heating unit in this section does not actively heat the material. It is isolated from the high-temperature zone by the partition plate, and the material temperature naturally and gradually drops to 2000℃, eliminating thermal stress and preventing material cracking.

[0039] After cooling, the material enters the insulation section 9, the heating unit maintains the temperature at 900℃, and the infrared temperature sensor 14 monitors the temperature. The material stabilizes its crystal structure under heat preservation conditions to ensure uniform performance of each batch of material, such as a particle size distribution deviation of ≤5%. Meanwhile, residual gas is further discharged and collected and treated by connecting to the exhaust gas emission system through exhaust pipe 25.

[0040] Phase 5: Discharge and Equipment Cleaning Material discharge After heat preservation, the finished graphite anode material enters the discharge hopper 2. The electric valve 24 of the discharge pipe 23 is opened according to the set cycle, and the material falls into the collection tank through the discharge pipe 23, completing the production. During the discharge process, the exhaust pipe 25 of the discharge hopper 2 collects residual exhaust gas, maintains a slight negative pressure inside the hopper, and prevents outside air from entering.

[0041] Equipment cleaning After shutting down all heating units, drive motor 19 and screw motor 3, and waiting for the furnace cylinder temperature to drop to room temperature, add cleaning water and start the screw conveyor 22 at the same time to clean the residual material powder on the inner wall of the cylinder and discharge the cleaning water through the discharge pipe 23 until the discharged cleaning water is clear water. Then start each heating unit to heat and dry each section of the cylinder. Check the sealing ring 16 and heating wire for wear and replace worn parts; clean the exhaust pipe 25 and exhaust gas treatment system to ensure normal operation in the next production run.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A continuous rotary kiln for producing battery negative electrode materials, characterized in that, include: The furnace body module includes a rotary furnace cylinder, a feed hopper (1) and a discharge bin (2). The feed hopper (1) is connected to the feed end of the rotary furnace cylinder through a flange. The discharge bin (2) is connected to the discharge end of the rotary furnace cylinder through a flange. The inner wall of the rotary furnace cylinder is provided with a wear-resistant ceramic coating. The outer side of the discharge bin (2) is provided with a discharge pipe (23). An electric valve (24) is provided on the discharge pipe (23). The segmented temperature control heating module surrounds the outside of the rotary furnace cylinder. The segmented temperature control heating module includes several independent heating units, an infrared temperature sensor (14), and a temperature controller (15). The independent heating units are distributed along the axial direction of the rotary furnace cylinder. Each independent heating unit uses an electric heating wire (13). The detection end of the infrared temperature sensor (14) extends into the interior of the rotary furnace cylinder. The temperature controller (15) is electrically connected to the independent heating units and the infrared temperature sensor (14). The spiral feeding adjustment module includes a spiral motor (3) and a spiral conveying paddle (22). The spiral conveying paddle (22) is rotatably installed inside the feed hopper (1), the rotary furnace cylinder and the discharge bin (2). The spiral motor (3) is located outside the feed hopper (1). The output end of the spiral motor (3) is connected to a geared motor (4). The output end of the geared motor (4) is connected to the spiral conveying paddle (22) through a coupling.

2. The continuous rotary kiln for producing battery negative electrode materials according to claim 1, characterized in that, The rotary kiln cylinder is distributed along the kiln cylinder axis as a preheating cylinder section, a carbonization cylinder section and a heat preservation cylinder section (9). The preheating cylinder section includes a low temperature preheating cylinder section (5) and a medium temperature cylinder section (6). The carbonization cylinder section includes a high temperature cylinder section (7) and a cooling transition cylinder section (8).

3. The continuous rotary kiln for producing battery negative electrode materials according to claim 2, characterized in that, The rotary furnace cylinder is provided with several partition temperature control cylinder sections (10), and the partition temperature control cylinder sections (10) are located between each adjacent cylinder section. The partition temperature control cylinder sections (10) are made of high temperature resistant partitions.

4. The continuous rotary kiln for producing battery negative electrode materials according to claim 3, characterized in that, The low-temperature preheating cylinder section (5), the medium-temperature cylinder section (6), the high-temperature cylinder section (7), the cooling transition cylinder section (8), and the heat preservation cylinder section (9) all include an outer cylinder (11) and an inner cylinder (12). A heating layer is provided between the outer cylinder (11) and the inner cylinder (12). The independent heating unit is located in the heating layer and is fixedly installed on the inner side of the outer cylinder (11). The two ends of the outer cylinder (11) are provided with guide grooves. The two sides of the isolation temperature control cylinder section (10) are provided with annular grooves. The two ends of the inner cylinder (12) are rotatably connected to the guide groove and the annular groove through a sealing ring (16).

5. A continuous rotary kiln for producing battery negative electrode materials according to claim 4, characterized in that, The bottom of the outer cylinder (11) is provided with a fixed base (21), and several expansion bolts pass through the fixed base (21).

6. The continuous rotary kiln for producing battery negative electrode materials according to claim 5, characterized in that, The outer cylinder (11) has two sections, and a rotating opening is provided between the two sections of the outer cylinder (11). A rotating gear ring (17) is fixedly installed on the inner cylinder (12), and the rotating gear ring (17) is located at the rotating opening. The inner cylinder (12) also includes a drive motor (19), which is located below the outer cylinder (11). A reduction gear (18) is installed at the output end of the drive motor (19), and the reduction gear (18) meshes with the rotating gear ring (17).

7. A continuous rotary kiln for producing battery negative electrode materials according to claim 6, characterized in that, The outer cylinder (11) is provided with a collar (20) at its end, and the rotating toothed ring (17) is provided with ring grooves on both sides, and the collar (20) is adapted to the ring grooves.

8. The continuous rotary kiln for producing battery negative electrode materials according to claim 1, characterized in that, Both the feed hopper and the discharge hopper (2) are equipped with exhaust pipes (25), and exhaust valves (26) are provided on the exhaust pipes (25).

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