Novel lithium iron phosphate roasting device
The design of a novel lithium iron phosphate roasting device has solved the problems of material accumulation and thermal stress deformation, achieving uniform material mixing and efficient heat transfer, thereby improving the roasting effect and equipment lifespan.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-05
- Publication Date
- 2026-04-03
AI Technical Summary
In traditional lithium iron phosphate roasting equipment, material accumulation leads to wear, thermal stress deformation, dust escape, and uneven heating of materials, which affects the roasting effect and equipment life.
A new type of lithium iron phosphate roasting device is adopted, including a lithium iron phosphate kiln, a silo and a heat exchanger. The inner kiln is equipped with a drive mechanism, a feeding mechanism and a cooling mechanism. The material is conveyed by an integral propulsion method. The inner kiln is designed with a spiral guide plate and heat dissipation nails to achieve uniform mixing of materials and efficient heat transfer.
It reduces friction and wear between materials and propulsion components, improves the uniformity of material heating and heat transfer efficiency, reduces dust escape, extends equipment life and optimizes roasting effect.
Smart Images
Figure CN121782853A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery cathode material technology, and more specifically, to a novel lithium iron phosphate calcination apparatus. Background Technology
[0002] Cathode materials are crucial to battery performance, requiring high operating voltage, high ion diffusion coefficient, high capacity, and excellent cycle stability. Among them, lithium iron phosphate with olivine structure has become one of the mainstream cathode materials for power batteries due to its good stability, high safety, and low cost. Among the many preparation methods, the technical route combining solid-state method and carbothermal reduction method has significant application advantages due to its simple process and low cost. In the current lithium iron phosphate roasting process, the main technology is to mix iron phosphate and lithium carbonate, incorporate organic carbon, and roast to form a carbon-coated shell.
[0003] However, the traditional screw feeding method has significant drawbacks. Material easily accumulates at the bottom of the screw structure, and this accumulation layer continuously compacts and hardens over time, causing severe wear on the screw blades and the inner wall of the feeding cylinder. Detached metal fragments, acting as magnetic foreign matter, mix into the material, significantly affecting the subsequent roasting and electrochemical performance of lithium iron phosphate. Furthermore, when processing high-temperature materials, the screw blades are prone to deformation due to thermal stress, further shortening the equipment's lifespan. Simultaneously, during material transfer within the kiln, insufficiently heated material may escape as dust, and the low heating time and rate prevent the material from forming an ideal crystal structure.
[0004] Therefore, a novel lithium iron phosphate roasting device is proposed to address the above problems. Summary of the Invention
[0005] The purpose of this application is to provide a novel lithium iron phosphate roasting apparatus.
[0006] The novel lithium iron phosphate roasting apparatus provided in this application adopts the following technical solution:
[0007] A novel lithium iron phosphate roasting apparatus includes a lithium iron phosphate kiln, a silo, and a heat exchanger. The surface of the lithium iron phosphate kiln is provided with a kiln heating section, a kiln constant temperature section, and a kiln cooling section. An inner kiln is rotatably connected inside the kiln heating section, the kiln constant temperature section, and the kiln cooling section. The interior of the lithium iron phosphate kiln is provided with a drive mechanism for driving the rotation of the inner kiln. The interior of the inner kiln is provided with a material feeding mechanism to improve the heating time and rate of the material. One end of the inner kiln is provided with a cooling mechanism for cooling the material. One end of the lithium iron phosphate kiln is provided with a piston pusher device for conveying the material in an integral propulsion manner.
[0008] Preferably, the driving mechanism includes a drive motor, a connecting rod, a gear, and a gear ring. The drive motor is fixedly connected inside the lithium iron phosphate kiln. A connecting rod is fixedly connected to one end of the drive motor. A gear is fixedly connected to one end of the connecting rod. A gear ring is fixedly connected to the surface of the inner kiln. The gear meshes with the gear ring.
[0009] By adopting the above technical solution, the start-up drive motor can drive the gear to rotate through the connecting rod, so that the gear can drive the inner kiln to rotate through the gear ring.
[0010] Preferably, the material-lifting mechanism includes a spiral guide plate, a spiral ribbon intermittent guide plate, and a lifting plate. Multiple sets of spiral guide plates are fixedly connected to one end of the inner kiln, and multiple sets of lifting plates are fixedly connected to the inside of the inner kiln.
[0011] By adopting the above technical solution, the intermittent feeding plate design inside the kiln ensures that the material moves forward in a spiral pulsation while increasing the material contact area. In this coupled process of movement and heating, it can increase the residence time of the material in the kiln, ensuring the heating time and rate of the material. At the same time, the intermittent feeding plate can enhance the structural stability of the high-temperature cylinder kiln and the movement and mixing of the material, effectively improving the heat transfer efficiency. Meanwhile, during the gas flow inside the cylinder, the wind speed on the cylinder wall is reduced, dust is greatly reduced, and the probability of insufficiently heated material escaping in the form of dust is reduced.
[0012] Preferably, the cooling mechanism includes heat dissipation pins, cooling grooves, water pipes, and nozzles. Multiple sets of heat dissipation pins are provided inside one end of the inner kiln, and cooling grooves are formed on the surface of the heat dissipation pins. Water pipes are provided inside the kiln cooling section, and multiple sets of nozzles are fixedly connected to the surface of the water pipes.
[0013] By adopting the above technical solution, the heat dissipation nails stir and exchange heat with the material during the rotation of the inner kiln, and more frequently turn the material, further enhancing the mixing degree and consistency of the material. With the help of the rotation of the inner kiln, cooling water is sprayed out from the nozzle through the water pipe. When the heat dissipation nails are in the upper part, the cooling water flows into the cooling tank and when they are in the lower part, it is automatically discharged from the cooling tank by gravity, forming a self-circulating cooling mechanism. While strengthening the stirring and mixing and improving the uniformity of the material, it greatly increases the heat dissipation area and improves the cooling efficiency.
[0014] Preferably, a spiral plate is fixedly connected to one end surface of the inner kiln, a gas guide pipe is provided at the bottom of the kiln heating section, multiple sets of first gas supply pipes are fixedly connected to the surfaces of the kiln heating section and the kiln constant temperature section, and a conversion pipe is provided on the surfaces of the kiln heating section and the kiln constant temperature section.
[0015] Preferably, a feeder is provided on one end surface of the lithium iron phosphate kiln, a piston pusher is provided on one end of the lithium iron phosphate kiln, a first nitrogen connection pipe is provided on the surface of the piston pusher, and a nitrogen tank is provided at one end of the first nitrogen connection pipe.
[0016] Preferably, the surface of the feeder is provided with a hopper, the surface of the hopper is provided with a second nitrogen connection pipe, one end of the second nitrogen connection pipe is matched with a nitrogen tank, the surface of the hopper is provided with a hopper inlet, the surface of the feeder is provided with a first dust suction pipe, and the surface of the hopper is provided with a second dust suction pipe.
[0017] Preferably, a bag filter is fixedly connected to one end of the first and second suction pipes, the surface of the bag filter is provided with an exhaust pipe, and one end of the exhaust pipe is provided with an exhaust fan.
[0018] Preferably, one end of the lithium iron phosphate kiln is provided with a first recovery pipe, one end of multiple sets of first gas supply pipes is fixedly connected to a second gas delivery pipe, one end of the second gas delivery pipe is fixedly connected to a heat exchanger, the surface of the heat exchanger is provided with a first gas delivery pipe and a natural gas inlet, one end of the first gas delivery pipe is connected to a silo, and one end of the guide gas outlet pipe is provided with a cooling fan, the cooling fan is in cooperation with the heat exchanger.
[0019] Preferably, a second recovery pipe is provided at one end of the kiln cooling section, a water processor is provided at one end of the second recovery pipe, and a discharge box is provided at one end of the lithium iron phosphate kiln.
[0020] The technical effects and advantages of this application are as follows:
[0021] Compared with existing technologies, this new lithium iron phosphate roasting device uses a piston pusher to transport materials in an integral propulsion manner, which greatly reduces friction and wear between the material and the propulsion components and cylinder wall. It also has better pressure resistance and high temperature resistance. The nitrogen gas required to drive the piston can be recovered to the upstream silo through the second nitrogen connection pipe after the feeding is completed, and reused as a protective atmosphere. This not only reduces nitrogen consumption, but also realizes the recycling of resources.
[0022] Compared with existing technologies, this novel lithium iron phosphate roasting device, through its feeding mechanism and the intermittent feeding plate design inside the kiln, ensures that the material moves forward in a spiral pulsating manner while increasing the material contact area. In this coupled process of movement and heating, it can increase the residence time of the material in the inner kiln, ensuring the heating time and rate of the material. Furthermore, through the intermittent guide plate of the spiral ribbon, it can enhance the structural stability of the high-temperature cylinder kiln and the movement and mixing of the material, effectively improving the heat transfer efficiency. At the same time, it reduces the wind speed on the cylinder wall during the gas flow inside the cylinder, greatly reducing dust and lowering the probability of insufficiently heated material escaping in the form of dust. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the overall structure of this application;
[0024] Figure 2 This is a schematic diagram of the structure of the lithium iron phosphate kiln and the kiln heating section in this application.
[0025] Figure 3 This is a schematic diagram of the structure of the lithium iron phosphate kiln and the constant temperature section of the kiln in this application;
[0026] Figure 4 This is a schematic diagram of the drive mechanism of this application;
[0027] Figure 5 This is a schematic diagram of the material copying mechanism of this application;
[0028] Figure 6 This is a schematic diagram of the cooling mechanism of this application.
[0029] The attached figures are labeled as follows: 1. Lithium iron phosphate kiln; 2. Kiln heating section; 3. Kiln constant temperature section; 4. Kiln cooling section; 5. Inner kiln; 6. Drive mechanism; 601. Drive motor; 602. Connecting rod; 603. Gear; 604. Gear ring; 7. Spiral plate; 8. Air outlet pipe; 9. Material lifting mechanism; 901. Spiral guide plate; 902. Spiral ribbon intermittent guide plate; 903. Material lifting plate; 10. First air supply pipe; 11. Conversion pipe; 12. Cooling mechanism; 1201. Heat dissipation nail; 1202. Cooling tank; 1203. Water pipe; 204. Nozzle; 13. Feeder; 14. Piston pusher; 15. First nitrogen connection pipe; 16. Nitrogen tank; 17. Hopper; 18. Second nitrogen connection pipe; 19. Hopper inlet; 20. First dust suction pipe; 21. Second dust suction pipe; 22. Bag filter; 23. Exhaust pipe; 24. Exhaust fan; 25. First recovery pipe; 26. Heat exchanger; 27. First air supply pipe; 28. Natural gas inlet; 29. Cooling fan; 30. Second air supply pipe; 31. Second recovery pipe; 32. Water processor; 33. Discharge box. Detailed Implementation
[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0031] Example 1
[0032] like Figures 1 to 6The novel lithium iron phosphate roasting apparatus shown includes a lithium iron phosphate kiln 1, a hopper 17, and a heat exchanger 26. The surface of the lithium iron phosphate kiln 1 is provided with a kiln heating section 2, a kiln constant temperature section 3, and a kiln cooling section 4. An inner kiln 5 is rotatably connected inside the kiln heating section 2, the kiln constant temperature section 3, and the kiln cooling section 4. The interior of the lithium iron phosphate kiln 1 is provided with a drive mechanism 6 for driving the inner kiln 5 to rotate. The interior of the inner kiln 5 is provided with a material feeding mechanism 9 to increase the material's heating time and rate, thereby increasing the material's residence time in the inner kiln 5 and thus improving the material's heating time and rate. One end of the inner kiln 5 is provided with a cooling mechanism 12 for cooling the material, which improves the material's uniformity and significantly increases the heat dissipation area, thereby improving the cooling efficiency. One end of the lithium iron phosphate kiln 1 is provided with a piston pusher device 14 for conveying the material in an integral propulsion manner, which greatly reduces the friction and wear between the material and the propulsion components and the cylinder wall.
[0033] In a preferred embodiment, the drive mechanism 6 includes a drive motor 601, a connecting rod 602, a gear 603, and a gear ring 604. The drive motor 601 is fixedly connected inside the lithium iron phosphate kiln 1. One end of the drive motor 601 is fixedly connected to the connecting rod 602, and one end of the connecting rod 602 is fixedly connected to the gear 603. The gear ring 604 is fixedly connected to the surface of the inner kiln 5. The gear 603 meshes with the gear ring 604. When the drive motor 601 is started, it can drive the gear 603 to rotate through the connecting rod 602, so that the gear 603 can drive the inner kiln 5 to rotate through the gear ring 604.
[0034] In a preferred embodiment, the material lifting mechanism 9 includes a spiral guide plate 901, a spiral ribbon intermittent guide plate 902, and a lifting plate 903. Multiple sets of spiral guide plates 901 are fixedly connected to one end of the inner kiln 5, and multiple sets of lifting plates 903 are fixedly connected inside the inner kiln 5. The intermittent lifting plate 903 inside the inner kiln 5 ensures that the material moves forward in a spiral pulsating manner while increasing the material contact area. In this coupled process of movement and heating, it can increase the residence time of the material in the inner kiln 5, ensuring the heating time and rate of the material. At the same time, the spiral ribbon intermittent guide plate 902 can enhance the structural stability of the high-temperature cylinder kiln and the movement and mixing of the material, effectively improving the heat transfer efficiency. Meanwhile, during the gas flow inside the cylinder, the wind speed on the cylinder wall is reduced, dust is greatly reduced, and the probability of insufficiently heated material escaping in the form of dust is reduced.
[0035] In a preferred embodiment, the cooling mechanism 12 includes heat dissipation nails 1201, cooling tanks 1202, water pipes 1203, and nozzles 1204. Multiple sets of heat dissipation nails 1201 are provided inside one end of the inner kiln 5. Cooling tanks 1202 are formed on the surface of the heat dissipation nails 1201. Water pipes 1203 are provided inside the kiln cooling section 4. Multiple sets of nozzles 1204 are fixedly connected to the surface of the water pipes 1203. The heat dissipation nails 1201 stir and exchange heat with the material during the rotation of the inner kiln 5, and more frequently turn the material, further enhancing the mixing degree and consistency of the material. With the help of the rotation of the inner kiln 5, cooling water is sprayed out from the nozzles 1204 through the water pipes 1203. When the heat dissipation nails are in the upper part, the cooling water flows into the cooling tank 1202, and when they are in the lower part, it is automatically discharged from the cooling tank 1202 by gravity, forming a self-circulating cooling mechanism. While strengthening the stirring and mixing and improving the uniformity of the material, it greatly increases the heat dissipation area and improves the cooling efficiency.
[0036] In a preferred embodiment, a spiral plate 7 is fixedly connected to one end surface of the inner kiln 5, which can effectively change the flow direction of flue gas in the outer kiln, increase its residence time in the kiln, and ensure the preheating effect. A guide gas outlet pipe 8 is provided at the bottom of the kiln heating section 2 to exhaust the gas in the kiln heating section 2. Multiple sets of first gas supply pipes 10 are fixedly connected to the surfaces of the kiln heating section 2 and the kiln constant temperature section 3. A conversion pipe 11 is provided on the surfaces of the kiln heating section 2 and the kiln constant temperature section 3.
[0037] In a preferred embodiment, a feeder 13 is provided on one end surface of the lithium iron phosphate kiln 1 for adding material into the lithium iron phosphate kiln 1 through the feeder 13. A piston pushing device 14 is provided on one end of the lithium iron phosphate kiln 1 to transport the material into the inner kiln 5 in an integral pushing manner. A first nitrogen connecting pipe 15 is provided on the surface of the piston pushing device 14, and a nitrogen tank 16 is provided at one end of the first nitrogen connecting pipe 15 for supplying gas to the piston pushing device 14. The piston is pushed by high-pressure nitrogen, so that the material is directly pushed into the inner kiln 5 for roasting.
[0038] In a preferred embodiment, the surface of the feeder 13 is provided with a hopper 17, and the surface of the hopper 17 is provided with a second nitrogen connection pipe 18. One end of the second nitrogen connection pipe 18 is connected to the nitrogen tank 16. After the feeding is completed, the nitrogen required to push the piston can be recovered to the upstream hopper 17 through the second nitrogen connection pipe 18 and reused as a protective atmosphere. This not only reduces nitrogen consumption but also realizes the recycling of resources. The hopper 17 is filled with nitrogen to protect the ferrous ions in the material from oxidation. The surface of the hopper 17 is provided with a hopper inlet 19 for adding material into the hopper 17 through the hopper inlet 19. The surface of the feeder 13 is provided with a first dust suction pipe 20, and the surface of the hopper 17 is provided with a second dust suction pipe 21.
[0039] In a preferred embodiment, a bag filter 22 is fixedly connected to one end of the first suction pipe 20 and the second suction pipe 21. Dust generated during feeding can pass through the bag filter 22. An exhaust pipe 23 is provided on the surface of the bag filter 22. An exhaust fan 24 is provided at one end of the exhaust pipe 23. When the exhaust fan 24 is started, the gas and material are separated by the bag filter 22, and the material directly enters the feeder 13 and the hopper 17.
[0040] In a preferred embodiment, a first recovery pipe 25 is provided at one end of the lithium iron phosphate kiln 1, and a second gas supply pipe 30 is fixedly connected to one end of multiple sets of first gas supply pipes 10. A heat exchanger 26 is fixedly connected to one end of the second gas supply pipe 30. The heat exchanger 26 can send heated natural gas into the kiln heating section 2 and the kiln constant temperature section 3 through the second gas supply pipe 30 and the first gas supply pipe 10. The surface of the heat exchanger 26 is provided with a first gas supply pipe 27 and a natural gas inlet 28, so that natural gas can be added into the heat exchanger 26 through the natural gas inlet 28. In order to heat the natural gas, one end of the first gas supply pipe 27 is connected to the silo 17, which can be used for tail gas recycling. The waste heat tail gas generated by the heat exchanger 26 can enter the silo 17 through the first gas supply pipe 27 to preheat the material. One end of the guide gas outlet pipe 8 is equipped with a cooling fan 29. The cooling fan 29 works with the heat exchanger 26 to send the preheated gas in the kiln heating section 2 into the heat exchanger 26 through the guide gas outlet pipe 8 and the cooling fan 29 for heat recovery and utilization, thereby effectively improving the heat utilization efficiency and reducing energy consumption.
[0041] In a preferred embodiment, a second recovery pipe 31 is provided at one end of the kiln cooling section 4, and a water processor 32 is provided at one end of the second recovery pipe 31. A discharge box 33 is provided at one end of the lithium iron phosphate kiln 1. When the cooling water in the kiln cooling section 4 is used up, it will be discharged into the water processor 32 through the second recovery pipe 31 so as to recycle the cooling water.
[0042] Example 2
[0043] Lithium iron phosphate data
[0044] Key parameters:
[0045] Feed rate: 2t / h
[0046] Feed moisture content: 3%
[0047] Natural gas consumption: 80 Nm3 / h
[0048] Natural gas to combustion air ratio: 1:10
[0049] Rotary kiln feed temperature: 25℃±5℃
[0050] Cooling kiln discharge temperature: 60℃-80℃
[0051] Rotary motor operating frequency: 15Hz~20Hz
[0052] The exhaust gas temperature of the roasting furnace is 700℃;
[0053] Preheating section kiln outlet air temperature: 500℃;
[0054] Recycled flue gas exhaust temperature: 300℃;
[0055] Nitrogen consumption: 400 Nm3 / h
[0056] Nitrogen purity: 99.99%
[0057] Smoke exhaust temperature of the cloth bag: 220℃
[0058] Temperature settings for each zone:
[0059] Temperature zone 1 2 3 4 5 6 7 8 9 10 Temperature (°C) 220 300 480 590 700 780 780 780 780 500
[0060] The data for calcined lithium iron phosphate are shown in the table below:
[0061] sample Ti content w(Ti) / % Fe / P molar ratio n(Fe) / n(P) Physicochemical properties Specific surface area / (m²·g⁻¹) Powder resistivity / (Ω·cm) Compacted density / (g·cm⁻³) Ti-0 0.0005 0.969 12.075 10.580 2.43 Ti-1 0.0510 0.968 12.851 11.550 2.47 Ti-2 0.0850 0.966 13.291 12.535 2.51 Ti-3 0.1130 0.965 13.621 14.570 2.48
[0062] Electrochemical performance (specific capacity at initial discharge) 0.1C / (mA·h·g⁻¹) 2.0C / (mA·h·g⁻¹) Capacity reduction / % Ti-0 151.7 129.5 14.63 Ti-1 157.5 142.1 9.78 Ti-2 160.9 142.6 11.37 Ti-3 154.0 121.5 21.10
[0063] The effect of titanium doping on lithium iron phosphate materials was investigated. As the Ti doping concentration increased from Ti-0 to Ti-3, the specific surface area of the material continuously increased, indicating that Ti... 4 The addition of ⁺ effectively refined the grains, but excessively fine particles also increased the interfacial contact resistance, leading to a simultaneous increase in powder resistivity. Regarding compaction density, the change showed a trend of first increasing and then decreasing, reaching a peak of 2.51 g·cm⁻³ in the Ti-2 sample. This is due to the optimized particle size distribution resulting from appropriate doping, while excessive doping (Ti-3) caused particle agglomeration due to excessively fine particles, thus disrupting the packing effect. The electrochemical performance closely matched the aforementioned physicochemical properties: the Ti-2 sample exhibited the highest discharge specific capacity (160.9 mA·h·g⁻¹) at 0.1C, while showing the smallest capacity decrease at a high rate of 2.0C (only 11.37%), demonstrating optimal overall performance. Conversely, the Ti-3 sample suffered from significant lattice distortion and excessively high resistivity due to excessive doping, resulting in severely deteriorated electrochemical performance. In summary, when n(Fe):n(Ti) is approximately 1:0.019 (corresponding to the Ti-2 sample), the material achieves the optimal balance between compaction density and electrochemical performance.
[0064] The working process of this application is as follows: The material is added into the feed hopper 17 through the feed port 19, and then fed into the feeder 13 through the feed hopper 17. The feeder 13 feeds the material into one end of the lithium iron phosphate kiln 1. The piston pushing device 14 is started, so that the material is transported in an overall pushing manner, which greatly reduces the friction and wear between the material and the pushing parts and the cylinder wall, and at the same time has better pressure resistance and high temperature resistance. The nitrogen required to push the piston can be recovered to the upstream feed hopper 17 through the second nitrogen connection pipe 18 after the feeding is completed, and reused as a protective atmosphere. This not only reduces nitrogen consumption, but also realizes the recycling of resources. The start of the drive motor 601 can drive the gear 603 to rotate through the connecting rod 602, so that the gear 603 can drive the inner kiln 5 to rotate through the gear ring 604. The intermittent lifting plate 903 inside the inner kiln 5 ensures that the material moves forward in a spiral pulsating manner while increasing the material contact area. In this coupled process of movement and heating, the residence time of the material in the inner kiln 5 can be increased, ensuring the heating time and rate of the material. The intermittent guide plate 902 with a spiral ribbon enhances the structural stability of the high-temperature cylindrical kiln and the mixing of materials, effectively improving heat transfer efficiency. Simultaneously, it reduces the wind speed on the kiln wall during gas flow, significantly reducing dust and lowering the probability of insufficiently heated materials escaping as dust. After heating, the material is fed into the kiln cooling section 4. The heat dissipation nails 1201, through the rotating inner kiln 5, stir and exchange heat with the material, more frequently turning it over, further enhancing the mixing degree and consistency. With the rotation of the inner kiln 5, cooling water is sprayed from the nozzles 1204 through the water pipes 1203. When the heat dissipation nails are at the top, the cooling water flows into the cooling tank 1202; when at the bottom, it is automatically discharged from the cooling tank 1202 by gravity, forming a self-circulating cooling mechanism. This strengthens mixing and improves material uniformity while significantly increasing the heat dissipation area and improving cooling efficiency. After cooling, the material is discharged through the discharge box 33 for subsequent use. This is the working principle of this new lithium iron phosphate roasting device.
Claims
1. A novel lithium iron phosphate roasting apparatus, comprising a lithium iron phosphate kiln (1), a silo (17), and a heat exchanger (26), wherein the surface of the lithium iron phosphate kiln (1) is provided with a kiln heating section (2), a kiln constant temperature section (3), and a kiln cooling section (4), and an inner kiln (5) is rotatably connected inside the kiln heating section (2), the kiln constant temperature section (3), and the kiln cooling section (4), characterized in that: The lithium iron phosphate kiln (1) is equipped with a drive mechanism (6) for driving the inner kiln (5) to rotate. The inner kiln (5) is equipped with a material feeding mechanism (9) to improve the heating time and rate of the material. One end of the inner kiln (5) is equipped with a cooling mechanism (12) for cooling the material. One end of the lithium iron phosphate kiln (1) is equipped with a piston pushing device (14) for conveying the material in an overall pushing manner.
2. The novel lithium iron phosphate roasting apparatus according to claim 1, characterized in that: The drive mechanism (6) includes a drive motor (601), a connecting rod (602), a gear (603), and a gear ring (604). The drive motor (601) is fixedly connected inside the lithium iron phosphate kiln (1). One end of the drive motor (601) is fixedly connected to the connecting rod (602). One end of the connecting rod (602) is fixedly connected to the gear (603). The gear ring (604) is fixedly connected to the surface of the inner kiln (5). The gear (603) meshes with the gear ring (604).
3. The novel lithium iron phosphate roasting apparatus according to claim 1, characterized in that: The material-lifting mechanism (9) includes a spiral guide plate (901), a spiral ribbon intermittent guide plate (902), and a material-lifting plate (903). Multiple sets of spiral guide plates (901) are fixedly connected to one end of the inner kiln (5). A spiral ribbon intermittent guide plate (902) is fixedly connected to the inside of the inner kiln (5). Multiple sets of material-lifting plates (903) are fixedly connected to the inside of the inner kiln (5).
4. The novel lithium iron phosphate roasting apparatus according to claim 1, characterized in that: The cooling mechanism (12) includes heat dissipation nails (1201), cooling grooves (1202), water pipes (1203) and nozzles (1204). Multiple sets of heat dissipation nails (1201) are provided inside one end of the inner kiln (5). Cooling grooves (1202) are opened on the surface of the heat dissipation nails (1201). Water pipes (1203) are provided inside the kiln cooling section (4). Multiple sets of nozzles (1204) are fixedly connected to the surface of the water pipes (1203).
5. The novel lithium iron phosphate roasting apparatus according to claim 1, characterized in that: A spiral plate (7) is fixedly connected to one end of the inner kiln (5). A gas outlet pipe (8) is provided at the bottom of the kiln heating section (2). Multiple sets of first gas supply pipes (10) are fixedly connected to the surfaces of the kiln heating section (2) and the kiln constant temperature section (3). A conversion pipe (11) is provided on the surfaces of the kiln heating section (2) and the kiln constant temperature section (3).
6. The novel lithium iron phosphate roasting apparatus according to claim 1, characterized in that: The lithium iron phosphate furnace (1) has a feeder (13) on one end surface and a piston pusher device (14) on one end. The piston pusher device (14) has a first nitrogen connection pipe (15) on its surface and a nitrogen tank (16) on one end of the first nitrogen connection pipe (15).
7. The novel lithium iron phosphate roasting apparatus according to claim 6, characterized in that: The surface of the feeder (13) is provided with a hopper (17), the surface of the hopper (17) is provided with a second nitrogen connection pipe (18), one end of the second nitrogen connection pipe (18) is connected to a nitrogen tank (16), the surface of the hopper (17) is provided with a hopper inlet (19), the surface of the feeder (13) is provided with a first dust suction pipe (20), and the surface of the hopper (17) is provided with a second dust suction pipe (21).
8. The novel lithium iron phosphate roasting apparatus according to claim 7, characterized in that: A bag filter (22) is fixedly connected to one end of the first suction pipe (20) and the second suction pipe (21). The surface of the bag filter (22) is provided with an exhaust pipe (23), and one end of the exhaust pipe (23) is provided with an exhaust fan (24).
9. The novel lithium iron phosphate roasting apparatus according to claim 1, characterized in that: The lithium iron phosphate furnace (1) is provided with a first recovery pipe (25) at one end, and a second gas supply pipe (30) is fixedly connected to one end of multiple sets of first gas supply pipes (10). A heat exchanger (26) is fixedly connected to one end of the second gas supply pipe (30). The surface of the heat exchanger (26) is provided with a first gas supply pipe (27) and a natural gas inlet (28). A silo (17) is connected to one end of the first gas supply pipe (27). A cooling fan (29) is provided at one end of the guide gas outlet pipe (8). The cooling fan (29) cooperates with the heat exchanger (26).
10. The novel lithium iron phosphate roasting apparatus according to claim 1, characterized in that: The furnace cooling section (4) is provided with a second recovery pipe (31) at one end, and a water processor (32) is provided at one end of the second recovery pipe (31). The lithium iron phosphate furnace (1) is provided with a discharge box (33) at one end.