Ultra-high temperature roller kiln and battery material sintering process

Abstract

The present invention discloses an ultra-high temperature roller kiln and a battery material sintering process, which belongs to the field of battery material sintering equipment. The kiln comprises an inlet displacement chamber, a low temperature section, a high temperature section, a cooling section and an outlet displacement chamber connected in sequence. The high temperature section comprises side heating elements and a supporting furnace wall member. The side heating elements are movably connected to the supporting furnace wall member, and the side heating elements extend into both sides of the high temperature section with adjustable depth. By arranging the side heating elements with adjustable insertion depth on the side of the high temperature section, high-density heat input is achieved, and the empty roller kiln can be stably operated at an ultra-high temperature above 1400°C, while meeting the needs of mass production of large-sized roller kilns.

Description

Technical Field

[0001] The present invention relates to the field of battery material sintering equipment, and in particular to an ultra-high temperature roller kiln and a battery material sintering process. Background Art

[0002] The rapid development of the new energy vehicle and energy storage industries is driving demand for high-performance batteries, such as lithium-ion and sodium-ion batteries. The production of battery positive and negative electrode materials (such as sodium cathodes and hard carbon anodes) requires a high-temperature sintering process, and sintering temperatures continue to rise with material upgrades. Some battery materials must be sintered in kilns above 1400°C, placing higher demands on the temperature limit, uniformity, and stability of the sintering equipment. The current mainstream high-temperature sintering equipment is the electric roller kiln, but its heating elements have drawbacks. For example, the long-term operating temperature of electric heating alloy wire typically does not exceed 1000°C, making it suitable only for low-temperature sintering. While silicon carbon rods can withstand higher temperatures, their maximum tolerance is approximately 1300°C, which still cannot meet the ultra-high temperature process requirements above 1400°C. In addition, although silicon molybdenum rods can withstand high-temperature sintering at 1600°C, their high-temperature expansion characteristics make it impossible to install them horizontally. They need to be installed vertically to the ground. Their heating area is limited to the side of the furnace, and it is difficult to form a uniform heating temperature field inside the entire furnace. Therefore, their adaptability is poor and they are only suitable for heating in small test furnaces. They cannot be used in roller kilns for mass production.

[0003] The large-scale production of lithium battery materials needs to meet the requirements of ultra-high temperature stability and temperature uniformity at the same time: on the one hand, it needs to operate for a long time above 1400°C and the temperature control accuracy must be controlled within ±5°C; on the other hand, it is necessary to ensure that the temperature difference in the kiln cross section does not exceed 10°C to avoid fluctuations in material properties. However, traditional roller kilns are limited by the temperature upper limit and heating method of the heating elements. The application scenarios of side heating of silicon-molybdenum rods are limited to test furnaces, and it is difficult to achieve a uniform temperature field in large-scale kilns. In addition, during the mass production of battery materials, the atmosphere disturbance in the furnace caused by the continuous entry and exit of saggers further aggravates the temperature fluctuations in the furnace, resulting in the inability of existing equipment to take into account both high-temperature performance and mass production requirements. Therefore, there is a need for a roller kiln structure with ultra-high temperature tolerance and uniform temperature in the kiln. Summary of the Invention

[0004] One of the purposes of the present invention is to provide an ultra-high temperature roller kiln, which solves the problems of insufficient heating temperature and uneven internal temperature distribution in the existing battery material roller kiln using electric heating.

[0005] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows:

[0006] An ultra-high temperature roller kiln comprises an inlet displacement chamber, a low temperature section, a high temperature section, a cooling section, and an outlet displacement chamber, which are connected in sequence. The high temperature section comprises side heating elements and a supporting furnace wall member. The side heating elements are movably connected to the supporting furnace wall member and extend into both sides of the interior of the high temperature section with adjustable depth.

[0007] The side heating element is a silicon-molybdenum rod. An electric heating element is provided in the low-temperature section. A protective layer is provided on the outer wall of the electric heating element. The electric heating element is one of a heating wire or a silicon-carbon rod. Different heating elements are arranged according to the temperature requirements of different sections to achieve ultra-high temperature heating and ensure the service life of the kiln.

[0008] The high-temperature section includes an atmosphere system, which includes a left air inlet chamber, a bottom air inlet chamber and a right air inlet chamber. The left air inlet chamber is arranged on the left side wall of the high-temperature section, the right air inlet chamber is arranged on the right side wall of the high-temperature section, the bottom air inlet chamber is arranged at the bottom of the high-temperature section, and the left air inlet chamber is arranged in the upper half of the high-temperature section, and the right air inlet chamber is arranged in the lower half of the high-temperature section. The bottom air inlet pipe on the bottom air inlet chamber is oriented towards the left air inlet chamber, so that a clockwise atmosphere circulation is formed in the high-temperature section. Through the circulation of the atmosphere, the heat generated by the side heating element is evenly distributed to various places in the section, ensuring uniform heating temperature. By arranging the side heating element with adjustable insertion depth on the side of the high-temperature section, high-density heat input is achieved, and the empty roller kiln can be stably operated at an ultra-high temperature of more than 1400°C, while adapting to the needs of mass production of large-size roller kilns.

[0009] Furthermore, the side heating element is an electrically heated U-shaped tube, which has a simple structure and is easy to arrange.

[0010] Furthermore, an installation groove is provided on the supporting furnace wall member, and the installation groove is arranged to pass through the supporting furnace wall member. The installation groove is arranged as a longitudinal groove parallel to the moving direction of the sagger or a transverse groove perpendicular to the moving direction of the sagger. The side heating element passes through the installation groove and extends into the high-temperature section. According to different usage requirements, the side heating elements are arranged in different directions to meet the requirements of usage space or heat density.

[0011] Furthermore, a plurality of first heat insulation panels are provided in the low-temperature section, and the plurality of first heat insulation panels are arranged at the inlet and outlet and inside the low-temperature section to prevent the airflow in the low-temperature section, thereby realizing gradient temperature rise within the section, making the temperature control more accurate and the temperature during internal heating more uniform.

[0012] Furthermore, the high-temperature section includes a high-temperature heating chamber, and the cooling section includes a buffer chamber. An upper insulation plate and a lower insulation plate are provided at the connection between the buffer chamber and the high-temperature heating chamber, which are used to separate the upper and lower parts of the chamber, block the flow of hot air atmosphere in the buffer chamber, and block the high-temperature gas in the high-temperature section from flowing to the buffer chamber and the cooling section, thereby avoiding affecting the cooling effect and improving the quality of the sintered battery material.

[0013] Preferably, the left air intake chamber includes a left air intake pipe and a left preheating chamber, one end of the left air intake pipe is connected to the left preheating chamber, and the other end is connected to the interior of the high-temperature section. The left air intake chamber has the same structure as the right air intake chamber, and the bottom air intake chamber includes a bottom air intake pipe and a bottom preheating chamber, one end of the bottom air intake pipe is connected to the bottom preheating chamber, and the other end is connected to the interior of the high-temperature section, so as to actively circulate the atmosphere in the section.

[0014] As a better option, it also includes a conveying system and a smoke exhaust system. The conveying system includes multiple conveying rollers. The outer walls of the conveying rollers in the high-temperature section are provided with an insulating coating. The top of the low-temperature section is provided with a smoke exhaust port. The smoke exhaust system is connected to the smoke exhaust port to increase the arrangement density of the side heating elements and discharge the waste gas generated by sintering.

[0015] The second purpose of the present invention is to provide a sintering process for battery material production, which solves the problem of uneven internal temperature distribution during high-temperature molding of existing battery material battery sintering processes.

[0016] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows:

[0017] A battery material sintering process, implemented by the ultra-high temperature roller kiln, comprises the following steps:

[0018] S1. The battery materials are loaded from the sagger and then enter the low-temperature section for preheating after the air is exhausted from the inlet displacement chamber;

[0019] S2. The exhaust gas generated by the battery materials in the preheating sagger in the low-temperature section is discharged to the outside through the smoke exhaust system on the low-temperature section. The battery materials are preheated to above 1250°C and then sent to the high-temperature section;

[0020] S3, the high-temperature section generates heat by the side heating element, and the heat is driven by the atmosphere system in the high-temperature section to circulate around the direction of travel of the sagger, uniformly heating the battery material to 1250℃-1600℃, so that the battery material is sintered and formed at high temperature;

[0021] S4. The sintered battery materials enter the cooling section and are cooled to 120°C-130°C. They are then replaced in the outlet replacement chamber and taken out of the furnace. The battery materials are evenly sintered in a high-temperature kiln to achieve batch production of battery materials.

[0022] The beneficial effects of the present invention are:

[0023] (1) The ultra-high temperature roller kiln is equipped with side heating elements in the high temperature section. The side heating elements are inserted into the high temperature section by means of movable connections. The insertion depth of each side heating element is adjustable and the arrangement is uniform. This solves the installation stability problem caused by the high temperature expansion of the silicon-molybdenum rod and breaks through the limitation of the traditional vertical lifting method on the furnace size, achieving ultra-high temperature stable operation above 1400℃ and adapting to the needs of mass production of large-scale roller kilns.

[0024] (2) The low temperature section of the ultra-high temperature roller kiln is equipped with an electric heating element, which is one of an electric heating wire or a silicon carbon rod, and the outer wall has a protective layer to prevent the battery material in the low temperature section from being corroded by the internal gas and damaging the electric heating element. The side heating element in the high temperature section is a silicon molybdenum rod, which has a high heating temperature and can be used for high temperature sintering of battery materials.

[0025] (3) The ultra-high temperature roller kiln is provided with left and right air inlet chambers with the left side higher and the right side lower in the high temperature section, and a bottom air inlet chamber arranged at the bottom of the kiln. The air inlet direction of the bottom air inlet chamber is toward the left air inlet chamber. When the three air inlet chambers take in air, the atmosphere in the kiln is pushed to rotate clockwise around the direction of movement of the sagger, so that the heat generated by the side heating elements can circulate in the kiln, and the heat generated by the side heating elements is evenly distributed to the battery materials in the kiln to heat the sagger until the atmosphere temperature is uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A simplified structural diagram of the ultra-high temperature roller kiln provided by the present invention;

[0027] Figure 2 A structural diagram of the low-temperature section, high-temperature section, and cooling section of the ultra-high-temperature roller kiln provided by the present invention;

[0028] Figure 3 A cross-sectional structural diagram of the low-temperature section of the ultra-high-temperature roller kiln provided by the present invention;

[0029] Figure 4 A cross-sectional structural diagram of the high-temperature section of the ultra-high-temperature roller kiln provided by the present invention;

[0030] Figure 5 A cross-sectional structural diagram of the cooling section of the ultra-high temperature roller kiln provided by the present invention;

[0031] Figure 6 for Figure 4 A partial enlarged view of part A above;

[0032] Figure 7 for Figure 4 A partial enlarged view of part B above;

[0033] Figure 8 for Figure 4 A partial enlarged view of the upper C part;

[0034] Figure 9 for Figure 4 A partial enlarged view of the upper D part;

[0035] Figure 10 for Figure 4 A partial enlarged view of part E above;

[0036] Figure 11 The side heating element method provided by the present invention Figure 1 ;

[0037] Figure 12 The side heating element method provided by the present invention Figure 2 ;

[0038] Figure 13 A structural diagram of the inlet displacement chamber provided by the present invention;

[0039] Figure 14 This is a diagram of the installation structure of the fixing clip provided by the present invention.

[0040] Reference numerals:

[0041] 1. Entrance displacement chamber; 11. Conveying system; 111. Conveying roller; 112. Insulating coating; 12. Displacement chamber; 13. First sealing door; 14. Second sealing door; 15. Third sealing door; 2. Low-temperature section; 21. First heat shield; 22. Smoke exhaust port; 23. Top sealing box; 24. Electric heating element; 25. Bottom air intake device; 26. Heating box sealing chamber; 27. First transmission sealing chamber; 28. Side air intake device; 3. High-temperature section; 31. Second heat shield; 32. High-temperature heating chamber; 33. Atmosphere system; 34. Right air intake chamber; 341. Right air intake pipe; 342 , right preheating chamber; 35, second transmission sealing chamber; 36, left air inlet chamber; 361, left air inlet pipe; 362, left preheating chamber; 37, side heating element; 371, insulation part; 3711, mounting groove; 372, extension part; 373, supporting furnace wall part; 38, bottom air inlet chamber; 381, bottom air inlet pipe; 382, ​​bottom preheating chamber; 4, cooling section; 41, bottom aeration device; 42, heat exhaust port; 43, buffer chamber; 431, upper insulation board; 432, lower insulation board; 44, heat exchange tube; 5, outlet replacement chamber; 6, smoke exhaust system; 7, heat extraction system; 8, sagger. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the application without making any creative efforts shall fall within the scope of protection of the present invention.

[0043] Example 1

[0044] like Figures 1-14 As shown, this embodiment discloses an ultra-high temperature roller kiln, comprising an inlet displacement chamber 1, a low temperature section 2, a high temperature section 3, a cooling section 4 and an outlet displacement chamber 5 connected in sequence, the high temperature section 3 comprising a side heating element 37 and a supporting furnace wall member 373, the side heating element 37 being movably connected to the supporting furnace wall member 373, and the side heating element 37 extending into both sides of the interior of the high temperature section 3 with adjustable depth, a plurality of side heating elements 37 being evenly arranged at certain intervals on both sides of the high temperature section 3, heating the battery material entering the high temperature section 3 by means of heated air and heat radiation, the insertion depth of each side heating element 37 being adjustable, solving the installation stability problem caused by the high temperature expansion of the silicon molybdenum rod, and having a higher arrangement density, thereby achieving stable operation at ultra-high temperatures above 1400°C.

[0045] The high temperature section 3 includes an atmosphere system 33, which includes a left air inlet chamber 36, a bottom air inlet chamber 38, and a right air inlet chamber 34. The left air inlet chamber 36 is arranged on the left side wall of the high temperature section 3, the right air inlet chamber 34 is arranged on the right side wall of the high temperature section 3, the bottom air inlet chamber 38 is arranged at the bottom of the high temperature section 3, and the left air inlet chamber 36 is arranged in the upper half of the high temperature section 3, the right air inlet chamber 34 is arranged in the lower half of the high temperature section 3, and the bottom air inlet pipe 381 on the bottom air inlet chamber 38 is oriented towards the direction of the left air inlet chamber 36, so that a clockwise rotation is formed in the high temperature section 3. In order to realize the atmosphere circulation, according to different specific circumstances, the left air inlet chamber 36 can be set at the lower part of the high-temperature section 3, the right air inlet chamber 34 can be set at the lower part of the high-temperature section 3, and the bottom air inlet chamber 38 faces the right air inlet chamber 34, so as to realize the counterclockwise circulation of the internal high-temperature atmosphere around the sagger 8, and the heat generated by the side heating elements 37 is evenly distributed in the high-temperature section 3 through the blown atmosphere. A stable and uniform high-temperature environment is formed in the entire high-temperature section 3, and the side heating elements 37 vertically hoisted on both sides provide heat to perform ultra-high-temperature heating on the battery materials by radiation and convection.

[0046] Preferably, a fixing clamp is provided at the end of the side heating element 37, and the fixing clamp and the side heating element 37 can slide relative to each other. A bolt is provided on the fixing clamp for applying the clamping force of the fixing clamp to clamp the side heating element 37. The fixing clamp is connected to the supporting furnace wall member 373 and is used to adjust the depth of the side heating element 37 entering the kiln.

[0047] Preferably, the side heating elements 37 extend vertically into the high-temperature section 3 , which can increase the arrangement density of the side heating elements 37 .

[0048] Furthermore, the side heating element 37 is an electrically heated U-shaped tube, which has a simple structure and a large heating area and is easy to install.

[0049] The side heating element 37 is a silicon-molybdenum rod. The low-temperature section 2 is provided with an electric heating element 24, which has a protective layer on its outer wall. The electric heating element 24 is either an electric heating wire or a silicon-carbon rod. The electric heating wire and silicon-carbon rod are suitable for heating below 1250°C, while the silicon-molybdenum rod is suitable for heating above 1250°C. By rationally arranging the spacing between the heating elements, the stable operation of the heating elements is ensured. By using the electric heating element 24 and the side heating element 37 in a zoned manner, the purpose of achieving ultra-high temperature stable heating of battery materials at 1400°C is achieved, avoiding the long-term use of the electric heating alloy wire at temperatures exceeding 1000°C. This also avoids the maximum temperature tolerance of the silicon-carbon rod, which is approximately 1300°C and cannot meet the requirements of the ultra-high temperature sintering process above 1400°C. Although the silicon-molybdenum rod can withstand high-temperature sintering at 1600°C, its high-temperature expansion characteristics prevent it from being installed horizontally. Instead, the stability of ultra-high temperature heating is ensured by installing it perpendicular to the ground.

[0050] Specifically, the electric heating elements 24 are horizontally inserted from both side walls of the low-temperature section 2 , and the electric heating elements 24 are respectively arranged above and below the sagger 8 to surround and heat the sagger 8 .

[0051] Furthermore, a mounting groove 3711 is provided on the supporting furnace wall member 373. The mounting groove 3711 is arranged to pass through the supporting furnace wall member 373 and be horizontal to the ground. The mounting groove 3711 is arranged to be a longitudinal groove parallel to the moving direction of the sagger 8. The side heating element 37 passes through the mounting groove 3711 and extends into the high-temperature section 3. The side heating element 37 can adjust the length of the extension into the high-temperature section 3 through the mounting groove 3711, thereby ensuring heating efficiency.

[0052] Preferably, the supporting furnace wall member 373 is an integral part of the furnace wall, and the insertion of the side heating element 37 is achieved by constructing a special-shaped structural member.

[0053] Preferably, it also includes an extension piece 372 and an insulation piece 371. One end of the extension piece 372 is connected to the supporting furnace wall piece 373, and the other end is connected to the insulation piece 371. The side heating element 37 passes through the insulation piece 371 and the extension piece 372 and enters the high-temperature section 3 from the installation groove 3711. The insulation piece 371 prevents the heat of the side heating element 37 from leaking from the tail, thereby improving the energy utilization rate. The extension piece 372 is used to adjust the length of the side heating element 37 extending into the high-temperature section 3 and surround the excess part to prevent heat overflow.

[0054] Furthermore, a plurality of first heat insulation plates 21 are provided in the low-temperature section 2. The plurality of first heat insulation plates 21 are arranged at the inlet and outlet and inside the low-temperature section 2, which serve to separate the low-temperature section 2 and reduce the temperature disturbance caused by the airflow. The hot air atmosphere in the section is difficult to flow, so that the temperature during heating is stable and the temperature rise curve of the battery material is stable, which facilitates the gradient control of the temperature rise and helps to control the exhaust gas generated by the battery material to be discharged in advance.

[0055] Preferably, the low temperature section 2 includes a top sealing box 23 surrounding the furnace wall, a heating box sealing cavity 26 and a first transmission sealing cavity 27, which realize the sealing and heat insulation of the kiln, prevent heat loss in the heating part and the transmission part, and improve energy utilization.

[0056] Preferably, a bottom air intake device 25 and a side air intake device 28 are provided at the bottom and side of the low-temperature section 2, respectively, for inputting hot atmosphere into the low-temperature section 2, which can replace the exhaust gas generated in the section and ensure the quality of the preheated battery material.

[0057] Furthermore, the high-temperature section 3 includes a high-temperature heating chamber 32, and the cooling section 4 includes a buffer chamber 43. An upper heat insulation plate 431 and a lower heat insulation plate 432 are provided at the connection between the buffer chamber 43 and the high-temperature heating chamber 32, which are used to separate the upper and lower parts of the buffer chamber 43, prevent the hot air in the high-temperature heating chamber 32 from entering the buffer chamber 43, control the cooling speed, and block the high-temperature gas in the high-temperature section from flowing to the buffer chamber 43 and the cooling section 4, so as to avoid affecting the cooling effect.

[0058] Preferably, a sealing structure and a second transmission sealing cavity 35 are also provided on the outside of the kiln of the high-temperature section 3 to seal the kiln and isolate the transmission part to achieve heat preservation.

[0059] Preferably, the left air intake chamber 36 includes a left air intake pipe 361 and a left preheating chamber 362, one end of the left air intake pipe 361 is connected to the left preheating chamber 362, and the other end is connected to the interior of the high-temperature section 3. The left air intake chamber 36 has the same structure as the right air intake chamber 34, and the right air intake chamber 34 includes a right air intake pipe 341 and a right preheating chamber 342, one end of the right air intake pipe 341 is connected to the right preheating chamber 342, and the other end is connected to the high-temperature section 3. The bottom air intake chamber 38 includes a bottom air intake pipe 381 and a bottom preheating chamber 382, ​​one end of the bottom air intake pipe 381 is connected to the bottom preheating chamber 382, ​​and the other end is connected to the interior of the high-temperature section 3. Each air intake chamber preheats the input atmosphere through the preheating chamber and then blows it into the high-temperature section 3 through the air intake pipe. By controlling the direction of the blown gas, the heat of each temperature zone in the high-temperature section 3 can be evenly distributed. By blowing the hot air generated by the side heating elements 37 on both sides of the high-temperature section 3, circulating heating of the high-temperature atmosphere is achieved.

[0060] More preferably, the inlet replacement chamber 1 includes a replacement chamber 12 and a first sealing door 13, a second sealing door 14 and a third sealing door 15 which are sequentially telescopically arranged along the length direction of the replacement chamber 12. The structure of the inlet replacement chamber 1 is the same as that of the outlet replacement chamber 5. The sagger 8 enters the replacement chamber 12 through the first sealing door 13. The first sealing door 13 is closed to form an enclosed space. Inert gas is blown into the replacement chamber 12 to replace the air, preventing the air from following the sagger 8 into the interior of the kiln and causing oxidation of the battery material. The second sealing door 14 and the third sealing door 15 are opened in sequence to separate the environment inside the kiln from the external environment, preventing heat leakage during feeding, and saving energy.

[0061] Preferably, it also includes a conveying system 11 and a smoke exhaust system 6. The conveying system 11 includes a plurality of conveying rollers 111. The outer wall of the conveying roller 111 in the high-temperature section 3 is provided with an insulating coating 112 to prevent the side heating element 37 from being too close to the conveying roller 111 to generate an arc. The insulating coating 112 can increase the length of the side heating element 37 entering the high-temperature section 3, thereby increasing the energy density of heating and achieving the effect of increasing the upper limit of temperature rise. A smoke exhaust port 22 is provided on the top of the low-temperature section 2, and the smoke exhaust system 6 is connected to the smoke exhaust port 22. When the low-temperature section 2 preheats the battery material in the sagger 8, the battery material will generate exhaust gas when heated, and the exhaust gas will corrode the inside of the kiln. The outer layer of the electric heating element 24 is covered with a protective layer. The protective layer uses a quartz tube or a ceramic tube to prevent exhaust gas corrosion. After the exhaust gas is generated, it is input into the smoke exhaust system 6 through the smoke exhaust port 22. The smoke exhaust system 6 treats the exhaust gas harmlessly and then discharges it outward.

[0062] Preferably, a heat exchange pipe 44 is provided in the cooling section 4, and the heat exchange pipe 44 is horizontally inserted into the kiln. The heat exchange pipe 44 is filled with a heat exchange medium to exchange the heat in the cooling section 4 to the outside through contact until the cooling effect is achieved.

[0063] Preferably, a heat extraction system 7 is provided on the cooling section 4 , and the heat extraction system 7 extracts hot air from the heat exhaust port 42 through a fan to reduce the temperature in the cooling section 4 .

[0064] Preferably, a bottom aeration device 41 is provided at the bottom of the cooling section 4 , and the bottom aeration device 41 inputs cooling gas into the cooling section 4 to accelerate the cooling of the sagger 8 .

[0065] Preferably, a second heat insulation board 31 is provided at one end of the high temperature section 3 opposite to the low temperature section 2 to prevent the temperature atmosphere in the low temperature section 2 from entering the high temperature section 3 and causing temperature fluctuations in the high temperature section 3 .

[0066] Example 2

[0067] See also Figure 11 and Figure 12This embodiment discloses an ultra-high temperature roller kiln, in which the mounting groove 3711 is arranged as a horizontal groove perpendicular to the travel direction of the sagger 8. The side heating element 37 extends into the high-temperature section 3 through the mounting groove 3711. By reducing the longitudinal space occupied by the side heating elements 37 in the longitudinal direction of the kiln, the arrangement density of the side heating elements 37 is increased, thereby increasing the heating speed and the upper limit of the heating temperature, thereby improving the production efficiency of the kiln. The side heating elements 37 are heated by silicon molybdenum rods, which can provide more heat to the sagger 8. Reasonable distribution of spacing can avoid arcing of the silicon molybdenum rods.

[0068] Example 3

[0069] This embodiment also discloses a battery material sintering process, which is implemented by an ultra-high temperature roller kiln and includes the following steps:

[0070] S1, the battery material is loaded from the sagger 8, and then enters the low temperature section 2 for preheating after the air is exhausted from the inlet displacement chamber 1;

[0071] S2, the waste gas generated by the preheating of the battery materials in the sagger 8 in the low temperature section 2 is discharged to the outside by the smoke exhaust system 6 on the low temperature section 2, and the battery materials are preheated to above 1250℃ and then sent to the high temperature section 3;

[0072] S3, the high temperature section 3 generates heat by the side heating element 37, and the heat is driven by the atmosphere system 33 in the high temperature section 3 to circulate around the direction of travel of the sagger 8, uniformly heating the battery material to 1250℃-1600℃, so that the battery material is sintered and formed at high temperature;

[0073] S4. The sintered battery material enters the cooling section 4 and is cooled to 120°C-130°C. It is then replaced in the outlet replacement chamber 5 and taken out of the furnace. The temperature of the battery material in the outlet replacement chamber 5 is further reduced to 80°C-90°C.

[0074] The specific working process of the ultra-high temperature roller kiln for battery materials is as follows:

[0075] After the battery material is loaded into the sagger 8, it enters the entrance replacement chamber 1. The first sealed door 13, the second sealed door 14 and the third sealed door 15 on the entrance replacement chamber 1 are opened in sequence to separate the replacement chamber 12 from the external environment, and the air replacement is achieved by the injection of inert gas. After the replacement is completed, the sagger 8 enters the low-temperature section 2, and the electric heating element 24 in the low-temperature section 2 heats the sagger 8. The exhaust gas generated after the battery material is preheated is treated by the exhaust system 6 on the exhaust port 22 and discharged outward. During heating, the first heat insulation board 21 divides the low-temperature section 2 into multiple shorter temperature zones to ensure that the heating temperature rise transition of the heating sagger 8 in the low-temperature section 2 is uniform and the temperature is stable during heating, so that the heating temperature can be controlled more accurately. When the temperature is heated to 1000℃-1250℃, the sagger 8 enters the high-temperature section 3 from the low-temperature section 2, and the side heating element 37 in the high-temperature section 3 generates heat for During heating, the second heat insulation board 31 in the high temperature section 3 is opened. During heating, the left air inlet chamber 36, the right air inlet chamber 34 and the bottom air inlet chamber 38 on the atmosphere system 33 are opened to blow hot air, so that the hot atmosphere in the high temperature section 3 rotates around the sagger 8, and the heat generated by the side heating element 37 is evenly distributed, so as to achieve uniform heating of the sagger 8. The sagger 8 is sintered and formed within a temperature range of 1250°C-1600°C. After sintering is completed, the sagger 8 enters the buffer chamber 43 in the cooling section 4. The upper heat insulation board 431 and the lower heat insulation board 432 in the buffer chamber 43 are opened to prevent hot air from entering the cooling section 4. The heat exchange pipe 44 in the cooling section 4 exchanges the heat in the sagger 8, and the heat extraction system 7 extracts the hot air atmosphere in the cooling section 4 from the heat exhaust port 42 on the cooling section 4. After the sagger 8 is lowered to a predetermined temperature, the sagger 8 is replaced through the outlet replacement chamber 5 and sent out of the kiln.

[0076] Based on the disclosure and teachings of the above description, those skilled in the art may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and any modifications and variations of the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although certain specific terms are used in this description, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims

1. An ultra-high temperature roller kiln comprising an inlet displacement chamber (1), a low temperature section (2), a high temperature section (3), a cooling section (4) and an outlet displacement chamber (5) connected in sequence, characterized in that: The high-temperature section (3) comprises a side heating element (37) and a supporting furnace wall member (373), wherein the side heating element (37) is movably connected to the supporting furnace wall member (373), and the side heating element (37) extends into both sides of the interior of the high-temperature section (3) in an adjustable depth; The side heating element (37) is a silicon molybdenum rod, an electric heating element (24) is provided in the low temperature section (2), a protective layer is provided on the outer wall of the electric heating element (24), and the electric heating element (24) is one of an electric heating wire or a silicon carbon rod; The high temperature section (3) includes an atmosphere system (33), and the atmosphere system (33) includes a left air inlet chamber (36), a bottom air inlet chamber (38) and a right air inlet chamber (34). The left air inlet chamber (36) is arranged on the left side wall of the high temperature section (3), the right air inlet chamber (34) is arranged on the right side wall of the high temperature section (3), the bottom air inlet chamber (38) is arranged at the bottom of the high temperature section (3), and the left air inlet chamber (36) is arranged in the upper half of the high temperature section (3), and the right air inlet chamber (34) is arranged in the lower half of the high temperature section (3). The bottom air inlet pipe (381) on the bottom air inlet chamber (38) faces the direction of the left air inlet chamber (36), so that a clockwise atmosphere circulation is formed in the high temperature section (3).

2. The ultra-high temperature roller kiln according to claim 1, characterized in that: The side heating element (37) is an electrically heated U-shaped tube.

3. The ultra-high temperature roller kiln according to claim 1, characterized in that: The supporting furnace wall member (373) is provided with a mounting groove (3711), and the mounting groove (3711) is arranged to pass through the supporting furnace wall member (373). The mounting groove (3711) is arranged to be a longitudinal groove parallel to the moving direction of the sagger (8) or a transverse groove perpendicular to the moving direction of the sagger (8). The side heating element (37) passes through the mounting groove (3711) and extends into the high-temperature section (3).

4. The ultra-high temperature roller kiln according to any one of claims 1 to 3, characterized in that: A plurality of first heat insulation panels (21) are provided in the low-temperature section (2), and the plurality of first heat insulation panels (21) are arranged at the inlet and outlet and inside of the low-temperature section (2) to prevent the flow of air in the low-temperature section (2).

5. The ultra-high temperature roller kiln according to claim 1, characterized in that: The high-temperature section (3) includes a high-temperature heating chamber (32), and the cooling section (4) includes a buffer chamber (43). An upper heat insulation plate (431) and a lower heat insulation plate (432) are provided at the connection between the buffer chamber (43) and the high-temperature heating chamber (32) for separating the upper and lower parts of the buffer chamber (43).

6. The ultra-high temperature roller kiln according to claim 1, characterized in that: The left air intake chamber (36) includes a left air intake pipe (361) and a left preheating chamber (362); one end of the left air intake pipe (361) is in communication with the left preheating chamber (362), and the other end is in communication with the interior of the high-temperature section (3); the left air intake chamber (36) has the same structure as the right air intake chamber (34); the bottom air intake chamber (38) includes a bottom air intake pipe (381) and a bottom preheating chamber (382); one end of the bottom air intake pipe (381) is in communication with the bottom preheating chamber (382), and the other end is in communication with the interior of the high-temperature section (3).

7. The ultra-high temperature roller kiln according to any one of claims 1 to 3, characterized in that: It also includes a conveying system (11) and a smoke exhaust system (6), wherein the conveying system (11) includes a plurality of conveying rollers (111), an insulating coating (112) is provided on the outer wall of the conveying rollers (111) in the high-temperature section (3), a smoke exhaust port (22) is provided at the top of the low-temperature section (2), and the smoke exhaust system (6) is connected to the smoke exhaust port (22).

8. A battery material sintering process, characterized in that: The ultra-high temperature roller kiln according to any one of claims 1 to 7 is realized, comprising the following steps: S1, the battery material is loaded from the sagger (8), passes through the inlet displacement chamber (1), and then enters the low-temperature section (2) for preheating; S2, the waste gas generated by the battery materials in the preheating sagger (8) in the low-temperature section (2) is discharged to the outside by the smoke exhaust system (6) on the low-temperature section (2), and the battery materials are preheated to above 1250°C and then sent to the high-temperature section (3); S3, the high-temperature section (3) generates heat by the side heating element (37), and the heat is driven by the atmosphere system (33) in the high-temperature section (3) to circulate around the moving direction of the sagger (8), uniformly heating the battery material to 1250°C-1600°C, so that the battery material is sintered and formed at high temperature; S4. The sintered battery material enters the cooling section (4) and is cooled to 120°C-130°C, and then is replaced in the outlet replacement chamber (5) before being taken out of the furnace.

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