Production device for preparing silicon carbide powder through carbothermal synthesis method

Abstract

The invention discloses a production device for preparing silicon carbide powder through a carbothermal synthesis method, and relates to the technical field of carbothermal synthesis equipment, the production device comprises a reaction tank body, a motor body arranged at the top of the reaction tank body, a stirring rod body movably connected with the output end of the motor body, and an air pump body arranged on one side of the reaction tank body, the reaction tank comprises an air pump body, a gas concentration tank arranged on one side of the air pump body, a gas circulation mechanism arranged at the top of the outer wall of the reaction tank body, a cleaning and recycling mechanism arranged in the gas circulation mechanism, and an exhaust purification structure which is formed through a filter screen in the gas circulation mechanism and is capable of rotating, self-cleaning and multi-stage sealing gas backflow. Therefore, the problems that a traditional fixed filter screen is easy to block and the reaction atmosphere is damaged due to gas leakage are solved, inert atmosphere leakage and air entering can be effectively avoided, the stability of an inert protection environment in the reaction tank body is ensured, material oxidation is prevented, the process continuity is improved, the equipment shutdown maintenance frequency is reduced, and the service life of a core component is prolonged.

Description

Technical Field

[0001] This invention relates to the field of carbothermal synthesis equipment technology, specifically to a production apparatus for producing silicon carbide powder by carbothermal synthesis. Background Technology

[0002] The carbothermal synthesis method for producing silicon carbide powder is a production device that synthesizes pretreated carbon powder and silicon powder into silicon carbide powder. Its workflow is generally "hydrolysis - drying - high-temperature reduction", which can be broken down into four steps:

[0003] 1. Raw material feeding and inert atmosphere replacement: Pretreated high-purity carbon powder (fixed carbon content ≥90%) and silicon powder (purity ≥99.5%) are fed into a carbothermal synthesis reactor at a preset molar ratio (C:Si≈3.15~3.45:1); after the reactor is closed, the atmosphere control system is started to introduce inert gas to replace the air in the reactor until the oxygen content in the reactor is ≤10ppm, thus creating an inert reaction environment.

[0004] 2. High-purity water is precisely injected into the reactor through the reactor feeding system to form a uniform slurry by mixing carbon powder and silicon powder; the heating system is started to raise the temperature to 100~150℃, and the stirring device is turned on simultaneously (speed 300~500r / min) to promote the hydrolysis reaction of silicon powder (core reaction: Si+2H2O→SiO2+2H2↑); during the stirring process, the gas film on the surface of the slurry is continuously broken, and the H2 generated by hydrolysis and the evaporated water vapor are discharged through the exhaust port with a filter device to ensure full contact between the solid and liquid phases and ensure that the silicon powder is completely converted into amorphous SiO2.

[0005] 3. Keep the stirring state unchanged and raise the temperature of the reactor to 150~300℃ for constant temperature drying; control the evaporation rate of water by gradient heating to avoid the formation of a hard shell on the surface of the slurry, which would cause internal water retention; the drying endpoint is when the moisture content of the material in the reactor is ≤0.5%, and finally dry, loose SiO2-C composite powder (carbon powder uniformly coated on the surface of SiO2 particles) is obtained.

[0006] 4. After drying, maintain a continuous supply of inert atmosphere and gradually increase the reactor temperature to 1600~2500℃ to enter the high-temperature carbothermic reduction stage; maintain the stirring device at a low speed (50~100r / min) to ensure uniform heating of the material and promote the core reaction (SiO2+3C→SiC+2CO↑); keep the temperature for 2~6 hours in the later stage of the reaction to ensure that SiO2 is completely converted into SiC crystals, and finally generate loose SiC crude product, which can be cooled and then entered into the subsequent crushing and purification process.

[0007] Under an inert atmosphere, when water is injected into the reactor and the stirring device is started, the moisture in the material continues to evaporate and form water vapor as the stirring and temperature rise. This water vapor will carry some fine particles of SiO2-C composite powder (intermediate products of the hydrolysis stage, not the final SiC particles), which are discharged through the exhaust pipe with the airflow and are intercepted and purified by the built-in filter screen in the pipe. During long-term operation, the entrained fine particles will continue to adhere to the outer surface of the filter screen, gradually causing the filter screen pores to become blocked and affecting the exhaust efficiency. At the same time, the fine particles intercepted by the filter screen are effective materials that can participate in the subsequent carbothermic reduction reaction. When cleaning the filter screen, this part of the material is easily lost, resulting in resource waste.

[0008] To address the aforementioned issues, there is an urgent need for innovative designs to be developed based on the existing production equipment for silicon carbide powder produced by carbothermal synthesis. Summary of the Invention

[0009] The present invention addresses the problem of overly simplistic solutions in existing technologies by providing a significantly different solution. Specifically, the present invention aims to provide a production apparatus for producing silicon carbide powder via carbothermal synthesis, thereby solving the problems of filter clogging, cleaning difficulties, and resource waste caused by loss of effective materials mentioned in the background.

[0010] To achieve the above objectives, the present invention provides the following technical solution: a production apparatus for producing silicon carbide powder by carbothermal synthesis, comprising a reaction vessel body, a motor body disposed on the top of the reaction vessel body, a stirring rod body movably connected to the output end of the motor body, a gas pump body disposed on one side of the reaction vessel body, a gas collection tank disposed on one side of the gas pump body, and further comprising:

[0011] A gas circulation mechanism is installed on the top of the outer wall of the reaction vessel body;

[0012] A cleaning and recovery mechanism installed inside the gas circulation mechanism;

[0013] The gas circulation mechanism includes a sealed chamber located on the top of the outer wall of the reaction vessel body. A filter screen is movably installed on the inner wall of the sealed chamber. A main exhaust pipe is installed on one side of the filter screen, and the filter screen passes through the main exhaust pipe. Gas guide plates are installed on both sides of the outer wall of the main exhaust pipe.

[0014] The filter screen is circular in shape;

[0015] The cleaning and recycling mechanism includes a recycling plate located at the bottom of the filter screen, and a pressure plate is movably installed at the bottom of the recycling plate.

[0016] Preferably, a gas recovery pipe is provided on one side of the inner wall of the sealed chamber, and the gas recovery pipes are symmetrically distributed;

[0017] A side gas pipe is provided on one side of the gas recovery pipe;

[0018] The filter screen has sealing rings at both the top and bottom of its outer wall;

[0019] The outer wall of the stirring rod body is provided with a linkage wheel.

[0020] Preferably, each of the sealing rings is provided with a clamping block at the top, and a brush is provided at the bottom of the outer wall of the clamping block;

[0021] A spring is connected to the bottom of the outer wall of the pressure plate;

[0022] The pressure plate is provided with a feed pipe on its exterior.

[0023] Preferably, the main exhaust pipe is provided with a cavity;

[0024] Both the filter and the sealing ring penetrate the cavity of the main exhaust pipe;

[0025] The gas guide plate covers the outside of the main exhaust pipe cavity.

[0026] Preferably, the gas guide plate is provided with a cavity;

[0027] The filter and sealing ring extend through the cavity of the gas guide plate;

[0028] One end of the gas recovery pipe is located between the gas guide plate and the main exhaust pipe.

[0029] Preferably, the other end of the gas recovery pipe is connected to the main exhaust pipe;

[0030] One end of the side air tube passes through the sealed chamber;

[0031] The other end of the side air pipe is connected to the main exhaust pipe.

[0032] Preferably, the sealing ring is clamped to the inner wall of the clamping block;

[0033] The sealing ring is movably connected to the clamping block;

[0034] The clamping block is connected to the inner wall of the sealing chamber.

[0035] Preferably, the outer wall of the sealing ring is in contact with the outer wall of the linkage wheel;

[0036] Both the sealing ring and the linkage wheel are made of flexible graphite.

[0037] Preferably, one side of the outer wall of the brush is in contact with the outer wall of the filter screen;

[0038] The recycling plate is aligned with the bottom of the brush.

[0039] Preferably, the two sides of the outer wall of the pressure plate are arc-shaped;

[0040] The arc-shaped angles on both sides of the outer wall of the pressure plate are opposite;

[0041] The feed pipe is connected to the inner wall of the reaction vessel body.

[0042] Compared with the prior art, the beneficial effects of the present invention are:

[0043] 1. By forming an exhaust purification structure of "rotational self-cleaning and multi-stage sealed gas reflux" through the filter screen in the gas circulation mechanism, the problems of easy clogging and gas leakage that damage the reaction atmosphere of traditional fixed filters are solved. In traditional carbothermal synthesis processes, exhaust filters are mostly fixedly installed. Fine particles carried by water vapor tend to continuously adhere to the filter surface, causing pore blockage and requiring frequent shutdowns for cleaning. Moreover, the gaps in the cavity where the filter is installed can easily cause gas leakage, compromising inert protection. In this invention, when the stirring rod body rotates, the friction between the linkage wheel and the sealing ring drives the filter screen to rotate synchronously, allowing the particles adsorbed on the outer wall of the filter screen to be held in place when it rotates to a fixed position. The filter screen is scraped off in real time at the block and brush locations, preventing filter screen blockage at the source. No downtime cleaning is required, ensuring continuous and stable exhaust efficiency. The sealing chamber can completely seal the filter screen installation cavity. In conjunction with the inclined gas guide plate, leaked gas is blocked and guided back to the main exhaust pipe through the gas recovery pipe. A small amount of gas that does not return is reintroduced into the main exhaust pipe through the side gas pipe, forming a full-process gas-sealed return loop. This effectively prevents inert atmosphere leakage and air ingress, ensuring a stable inert protective environment inside the reaction tank and preventing material oxidation. This not only improves process continuity but also reduces the frequency of equipment downtime maintenance and extends the service life of core components.

[0044] 2. By setting up a cleaning and recycling mechanism, particles can be directionally recycled and reused, solving the problem of resource waste caused by the loss of effective materials during the traditional filter cleaning process. When cleaning filters with traditional equipment, the intercepted SiO2-C composite powder fine particles are mostly discarded with the waste, resulting in raw material loss and increased costs. In this invention, the particles scraped off by the brush slide onto the pressure plate via an inclined recycling plate. When the weight of the accumulated particles compresses the pressure plate and rotates downwards, the particles flow directly back into the reaction tank body through the discharge pipe to participate in the carbothermic reduction reaction again. The arc-shaped design at both ends of the pressure plate allows it to rotate only downwards in one direction, preventing gas from rising inside the reaction tank and causing sealing failure. After discharge, the spring can drive the pressure plate to quickly reset. The returned particles, as effective intermediate products in the hydrolysis stage, participate in the reaction again without affecting the quality of the final product. At the same time, a small amount of gas entering the sealed chamber during the return process can be reintroduced into the main exhaust pipe through the side gas pipe and finally collected in the gas collection tank, realizing dual recovery of materials and gases. This design significantly improves the utilization rate of raw materials, reduces resource waste, and lowers production costs. Attached Figure Description

[0045] Figure 1This is a schematic diagram of the overall structure of the present invention.

[0046] Figure 2 This is a front view of the overall structure of the present invention.

[0047] Figure 3 This is a cross-sectional view of the internal structure of the reaction vessel body, gas circulation mechanism, and cleaning and recovery mechanism of the present invention.

[0048] Figure 4 This is a schematic diagram of the gas circulation mechanism of the present invention.

[0049] Figure 5 This is a schematic diagram of the internal structure of the gas circulation mechanism of the present invention;

[0050] Figure 6 This is a top view of the internal structure of the gas circulation mechanism of the present invention;

[0051] Figure 7 This is a schematic diagram of the internal structure of the gas circulation mechanism of the present invention;

[0052] Figure 8 This is a partial structural schematic diagram of the gas circulation mechanism of the present invention;

[0053] Figure 9 This is a schematic diagram of the structure of the filter screen, sealing ring, and linkage wheel of the present invention;

[0054] Figure 10 This is a schematic diagram of the connection structure of the clamping block, brush, sealing ring and filter screen of the present invention;

[0055] Figure 11 This is a schematic diagram of the structure of the clamping block and brush of the present invention;

[0056] Figure 12 This is a schematic diagram of the structure of the recycling plate and the pressure plate of the present invention;

[0057] Figure 13 This is a schematic diagram of the structure of the recycling plate, pressure plate, and spring of the present invention;

[0058] Figure 14 This is a cross-sectional plan view of the internal structure of the cleaning and recycling mechanism of the present invention.

[0059] In the diagram: 1. Reactor body; 2. Motor body; 3. Stirring rod body; 4. Gas circulation mechanism; 401. Sealed chamber; 402. Filter screen; 403. Main exhaust pipe; 404. Gas guide plate; 405. Gas recovery pipe; 406. Side gas pipe; 407. Sealing ring; 408. Linkage wheel; 5. Cleaning and recovery mechanism; 501. Clamping block; 502. Brush; 503. Recovery plate; 504. Pressure plate; 505. Spring; 506. Discharge pipe; 6. Air pump body; 7. Gas collection tank. Detailed Implementation

[0060] 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.

[0061] Please see Figures 1 to 14 This invention provides a technical solution: a production apparatus for producing silicon carbide powder by carbothermal synthesis, comprising a reaction tank body 1, a motor body 2 disposed on the top of the reaction tank body 1, a stirring rod body 3 movably connected to the output end of the motor body 2, a gas pump body 6 disposed on one side of the reaction tank body 1, a gas collection tank 7 disposed on one side of the gas pump body 6, and further comprising:

[0062] Gas circulation mechanism 4 is installed on the top of the outer wall of the reaction vessel body 1;

[0063] Cleaning and recycling mechanism 5 is installed inside gas circulation mechanism 4;

[0064] The gas circulation mechanism 4 includes a sealed chamber 401 located on the top of the outer wall of the reaction vessel body 1. A filter screen 402 is movably arranged on the inner wall of the sealed chamber 401. A main exhaust pipe 403 is arranged on one side of the filter screen 402. The filter screen 402 passes through the main exhaust pipe 403. Gas guide plates 404 are arranged on both sides of the outer wall of the main exhaust pipe 403.

[0065] Filter 402 is circular;

[0066] The cleaning and recycling mechanism 5 includes a recycling plate 503 located at the bottom of the filter screen 402, and a pressure plate 504 is movably provided at the bottom of the recycling plate 503.

[0067] In this embodiment, the filter 402 in the gas circulation mechanism 4 forms an exhaust purification structure of "rotational self-cleaning and multi-stage sealed gas reflux," thereby solving the problems of easy clogging and gas leakage that damages the reaction atmosphere in traditional fixed filters. In traditional carbothermal synthesis processes, exhaust filters are mostly fixedly installed, and fine particles carried by water vapor tend to continuously adhere to the filter surface, causing pore blockage and requiring frequent shutdowns for cleaning. Furthermore, the gaps in the cavity where the filter is installed can easily cause gas leakage, compromising inertial protection. In this invention, when the stirring rod body 3 rotates, the friction between the linkage wheel 408 and the sealing ring 407 drives the filter 402 to rotate synchronously, allowing the particles adsorbed on the outer wall of the filter 402 to rotate freely between the fixed clamping block 501 and the filter. The brush 502 is scraped in real time, preventing the filter 402 from clogging at the source. No downtime cleaning is required, ensuring continuous and stable exhaust efficiency. At the same time, the sealing chamber 401 can completely seal the filter 402 installation cavity. With the inclined gas guide plate 404, leaked gas is blocked and guided back to the main exhaust pipe 403 through the gas recovery pipe 405. A small amount of gas that does not return is reintroduced into the main exhaust pipe 403 through the side gas pipe 406, forming a full-process gas sealed return loop. This effectively prevents inert atmosphere leakage and air entry, ensuring a stable inert protection environment inside the reaction tank body 1, preventing material oxidation, improving process continuity, reducing equipment downtime maintenance frequency, and extending the service life of core components.

[0068] A gas recovery pipe 405 is provided on one side of the inner wall of the sealed chamber 401, and the gas recovery pipes 405 are symmetrically distributed.

[0069] A side gas pipe 406 is provided on one side of the gas recovery pipe 405;

[0070] Sealing rings 407 are provided at the top and bottom of the outer wall of filter screen 402;

[0071] The outer wall of the stirring rod body 3 is provided with a linkage wheel 408.

[0072] In this embodiment, the cleaning and recycling mechanism 5 enables the targeted recycling and reuse of particles, solving the problem of resource waste caused by the loss of effective materials during traditional filter cleaning. In traditional equipment, the intercepted SiO2-C composite powder particles are often discarded with the waste, resulting in raw material loss and increased costs. However, in this invention, the particles scraped off by the brush 502 slide onto the pressure plate 504 via the inclined recycling plate 503. When the weight of the accumulated particles presses the pressure plate 504 downwards, the particles flow directly back into the reaction tank body 1 through the feed pipe 506 to participate in the carbothermic reduction reaction again. Furthermore, the arc-shaped design at both ends of the pressure plate 504 allows it to rotate only downwards in one direction, preventing gas from being pushed up inside the reaction vessel body 1 and causing sealing failure. After discharge, the spring 505 can drive the pressure plate 504 to quickly reset. The refluxed particles, as effective intermediate products in the hydrolysis stage, can re-participate in the reaction without affecting the quality of the final product. At the same time, a small amount of gas entering the sealed chamber 401 during the reflux process can be reintroduced into the main exhaust pipe 403 through the side gas pipe 406 and finally collected in the gas collection tank 7, realizing the dual recovery of materials and gases. This design significantly improves the utilization rate of raw materials, reduces resource waste, and lowers production costs.

[0073] Each sealing ring 407 is provided with a clamping block 501 on its top, and a brush 502 is provided on the bottom of the outer wall of the clamping block 501.

[0074] A spring 505 is connected to the bottom of the outer wall of the pressure plate 504;

[0075] The pressure plate 504 is provided with a feed pipe 506 on its exterior.

[0076] In this embodiment, toner, silicon powder, and water are all stirred by the stirring rod body 3. During stirring, the water evaporates and is discharged through the main exhaust pipe 403. When the motor body 2 drives the stirring rod body 3 to stir, the stirring rod body 3 will rotate. The outer wall of the stirring rod body 3 is provided with a linkage wheel 408. When the linkage wheel 408 rotates, it will drive the sealing ring 407 to rotate through friction. The filter screen 402, which is disposed between the sealing rings 407, will also be driven to rotate. When the gas is discharged through the main exhaust pipe 403, the gas will pass through the outer wall of the filter screen 402, and the particles in the gas will be filtered by the filter screen 402 (the annular arrangement of the filter screen 402 allows it to carry out the particles by rotation, while performing adaptive cleaning).

[0077] The main exhaust pipe 403 is provided with a cavity;

[0078] Both the filter 402 and the sealing ring 407 penetrate the cavity of the main exhaust pipe 403;

[0079] The gas guide plate 404 covers the outside of the cavity of the main exhaust pipe 403.

[0080] In this embodiment, the gas passes through the outer wall of the filter screen 402, and the particles in the gas are filtered by the filter screen 402. At the same time, the filter screen 402 is rotating. After the particles are adsorbed on the outer wall of the filter screen 402, it rotates to the clamping block 501. Since the clamping block 501 and the brush 502 are fixed, the brush 502 can scrape the particles on the outer wall of the filter screen 402 and let them fall into the inner wall of the recovery plate 503. Because a cavity is opened in the main exhaust pipe 403 and the filter screen 402 passes through the cavity of the main exhaust pipe 403, even if the air pump body 6 is started to generate suction to draw out the gas (the overall sealing of the sealing chamber 401, and the gas recovery pipe 405 and the side air pipe 406 form an overall sealed circulation, making it difficult for the gas to leak).

[0081] The gas guide plate 404 is provided with a cavity;

[0082] The filter screen 402 and the sealing ring 407 pass through the cavity of the gas guide plate 404;

[0083] One end of the gas recovery pipe 405 is located between the gas guide plate 404 and the main exhaust pipe 403.

[0084] In this embodiment, even if the air pump body 6 is activated to generate suction and draw out the gas, a small portion of the gas will still leak out from the cavity, i.e., the outer wall of the filter screen 402. This leaked gas will be discharged into the space between the gas guide plate 404 and the main exhaust pipe 403. Because the gas guide plate 404 is set at an angle, the gas will be blocked by the outer wall of the gas guide plate 404 and flow back. The flow-back gas will be discharged back into the inner wall of the main exhaust pipe 403 through the gas recovery pipe 405. However, because the filter screen 402 is permeable, a small portion of the gas will still be discharged from the cavity of the gas guide plate 404. Therefore, a sealing chamber 401 is set on the outside for sealing. The excess small portion of gas will be continuously discharged into the interior of the main exhaust pipe 403 through the side air pipe 406.

[0085] The other end of the gas recovery pipe 405 is connected to the main exhaust pipe 403;

[0086] One end of the side air tube 406 penetrates the sealed chamber 401;

[0087] The other end of the side air pipe 406 is connected to the main exhaust pipe 403.

[0088] In this embodiment, since the filter 402 is permeable, a small amount of gas will still be discharged from the cavity of the gas guide plate 404. Therefore, a sealing chamber 401 is set on the outside for sealing. The excess small amount of gas will be continuously discharged into the interior of the main exhaust pipe 403 through the side air pipe 406. After the particles fall into the inner wall of the recovery plate 503, because the outer wall of the recovery plate 503 is inclined, the particles will slide into the outer wall of the pressure plate 504. As the particles accumulate, the weight of the particles will compress the pressure plate 504 to rotate. At this time, these particles will be discharged into the inner wall of the reaction tank body 1 through the feed pipe 506 for reuse.

[0089] The sealing ring 407 is clamped to the inner wall of the clamping block 501;

[0090] The sealing ring 407 is movably connected to the clamping block 501;

[0091] The clamping block 501 is connected to the inner wall of the sealing chamber 401.

[0092] In this embodiment, because the two ends of the pressure plate 504 are arc-shaped, the arc shape allows the pressure plate 504 to rotate downwards only, and it will not be pushed upwards by the gas inside the reaction vessel body 1. After the pressure plate 504 finishes discharging, the spring 505 will drive the pressure plate 504 to reset. Since these particles are essentially reactants after the hydrolysis of carbon powder and silicon powder, re-discharging them into the inner wall of the reaction vessel body 1 will not affect the existing particles. At the same time, because the discharge pipe 506 and the reaction vessel body 1 are interconnected when the pressure plate 504 discharges, some gas will enter the inner wall of the sealed chamber 401. This gas will be discharged back into the main exhaust pipe 403 through the side gas pipe 406, and then discharged into the air pump body 6 through the main exhaust pipe 403.

[0093] The outer wall of the sealing ring 407 fits against the outer wall of the linkage wheel 408;

[0094] Both the sealing ring 407 and the linkage wheel 408 are made of flexible graphite.

[0095] In this embodiment, because a cavity is opened in the main exhaust pipe 403 and the filter screen 402 passes through the cavity of the main exhaust pipe 403, even if the air pump body 6 is activated to generate suction to draw out the gas, a small portion of the gas will still leak out from the cavity, that is, the outer wall of the filter screen 402. This leaked gas will be discharged into the space between the gas guide plate 404 and the main exhaust pipe 403. Because the gas guide plate 404 is set in an inclined shape, the gas will be blocked by the outer wall of the gas guide plate 404 and flow back. The flowed gas will be discharged back into the inner wall of the main exhaust pipe 403 through the gas recovery pipe 405. However, because the filter screen 402 is permeable, a small portion of the gas will still be discharged from the cavity of the gas guide plate 404.

[0096] One side of the outer wall of brush 502 is in contact with the outer wall of filter screen 402;

[0097] The bottoms of the recycling plate 503 and the brush 502 are aligned.

[0098] In this embodiment, as the particles accumulate, their weight compresses the pressure plate 504, causing it to rotate. At this time, these particles are discharged into the inner wall of the reaction vessel body 1 through the discharge pipe 506 for reuse. Since the two ends of the pressure plate 504 are arc-shaped, the arc shape allows the pressure plate 504 to rotate downwards only, and it will not be pushed upwards by the gas inside the reaction vessel body 1. After the pressure plate 504 finishes discharging, the spring 505 will drive the pressure plate 504 to reset. Since these particles are essentially reactants after the hydrolysis of carbon powder and silicon powder, their re-discharge into the inner wall of the reaction vessel body 1 for reaction will not affect the existing particles. At the same time, the discharge pipe 506 and the reaction vessel body 1 are in a state of communication when the pressure plate 504 is discharging.

[0099] The outer walls of the 504 bearing plate are rounded on both sides;

[0100] The arc-shaped angles on both sides of the outer wall of the 504 bearing plate are opposite;

[0101] The feed pipe 506 is connected to the inner wall of the reaction vessel body 1.

[0102] In this embodiment, a cavity is opened in the main exhaust pipe 403 and the filter screen 402 passes through the cavity of the main exhaust pipe 403. At this time, even if the air pump body 6 is started to generate suction to draw out the gas, a small part of the gas will still leak out from the cavity, that is, the outer wall of the filter screen 402. This leaked gas will be discharged into the space between the gas guide plate 404 and the main exhaust pipe 403. Because the gas guide plate 404 is set in an inclined shape, the gas will be blocked by the outer wall of the gas guide plate 404 and flow back. The flowed gas will be discharged back into the inner wall of the main exhaust pipe 403 through the gas recovery pipe 405. However, because the filter screen 402 is permeable, a small part of the gas will still be discharged from the cavity of the gas guide plate 404. Therefore, a sealing chamber 401 is set on the outside for sealing.

[0103] Working principle: When using this production equipment for producing silicon carbide powder via carbothermal synthesis, such as... Figure 1 , Figure 2 , Figure 3 The diagram shows that the pre-treated silicon powder and carbon powder have been added into the interior of the reaction vessel 1 and the heating and stirring have begun. Water has been injected to start the hydrolysis and heating reaction. The motor body 2 and the air pump body 6 are both on. The hydrolysis reaction is taking place inside the reaction vessel 1.

[0104] First, the toner, silicon powder, and water are all stirred by the stirring rod body 3. During stirring, the water evaporates and is discharged through the main exhaust pipe 403. When the motor body 2 drives the stirring rod body 3 to stir, the stirring rod body 3 will rotate. The outer wall of the stirring rod body 3 is provided with a linkage wheel 408. When the linkage wheel 408 rotates, it will drive the sealing ring 407 to rotate through friction. The filter screen 402, which is located between the sealing rings 407, will also be driven to rotate. When the gas is discharged through the main exhaust pipe 403, the gas will pass through the outer wall of the filter screen 402, and the particles in the gas will be filtered by the filter screen 402. At the same time, the filter screen 402 is rotating. After the particles are adsorbed on the outer wall of the filter screen 402, it will rotate to the clamping block 501. Since the clamping block 501 and the brush 502 are fixed, the brush 502 can scrape the particles on the outer wall of the filter screen 402 and let them fall into the inner wall of the recovery plate 503.

[0105] See also Figure 6 Because a cavity is opened in the main exhaust pipe 403 and the filter 402 passes through the cavity of the main exhaust pipe 403, even if the air pump body 6 is activated to generate suction to draw out the gas, a small amount of gas will still leak out from the cavity, that is, the outer wall of the filter 402. This leaked gas will be discharged into the space between the gas guide plate 404 and the main exhaust pipe 403. Because the gas guide plate 404 is set at an angle, the gas will be blocked by the outer wall of the gas guide plate 404 and flow back. The returned gas will be discharged back into the inner wall of the main exhaust pipe 403 through the gas recovery pipe 405. However, because the filter 402 is permeable, a small amount of gas will still be discharged from the cavity of the gas guide plate 404. Therefore, a sealing chamber 401 is set on the outside to seal it. The excess small amount of gas will be continuously discharged into the interior of the main exhaust pipe 403 through the side air pipe 406.

[0106] After the particles fall into the inner wall of the recovery plate 503, because the outer wall of the recovery plate 503 is inclined, the particles will slide onto the outer wall of the pressure plate 504. As the particles accumulate, their weight will force the pressure plate 504 to rotate. At this time, these particles will be discharged into the inner wall of the reaction tank body 1 through the discharge pipe 506 for reuse. Meanwhile, because the two ends of the pressure plate 504 are arc-shaped, the arc-shaped design means that the pressure plate 504 can only rotate downwards and will not be pushed upwards by the gas inside the reaction tank body 1. After the pressure plate 504 has finished discharging, the spring 5 05 will cause the pressure plate 504 to reset. Since these particles are essentially reactants after the hydrolysis of carbon powder and silicon powder, their re-discharge into the inner wall of the reaction tank body 1 will not affect the existing particles. At the same time, because the discharge pipe 506 and the reaction tank body 1 are interconnected when the pressure plate 504 discharges, some gas will enter the inner wall of the sealed chamber 401. This gas will be discharged back into the main exhaust pipe 403 through the side gas pipe 406, and then discharged into the gas pump body 6 through the main exhaust pipe 403, and finally enter the gas collection tank 7 for storage.

[0107] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A production apparatus for producing silicon carbide powder by carbothermal synthesis, comprising a reaction vessel body (1), a motor body (2) disposed on the top of the reaction vessel body (1), a stirring rod body (3) movably connected to the output end of the motor body (2), a gas pump body (6) disposed on one side of the reaction vessel body (1), and a gas collection tank (7) disposed on one side of the gas pump body (6), characterized in that, Also includes: Gas circulation mechanism (4) is installed on the top of the outer wall of the reaction vessel body (1); Cleaning and recycling mechanism (5) is installed inside the gas circulation mechanism (4); The gas circulation mechanism (4) includes a sealed chamber (401) disposed on the top of the outer wall of the reaction vessel body (1). A filter screen (402) is movably disposed on the inner wall of the sealed chamber (401). A main exhaust pipe (403) is disposed on one side of the filter screen (402). The filter screen (402) passes through the main exhaust pipe (403). Gas guide plates (404) are disposed on both sides of the outer wall of the main exhaust pipe (403). The filter screen (402) is circular; The cleaning and recycling mechanism (5) includes a recycling plate (503) disposed at the bottom of the filter screen (402), and a pressure plate (504) is movably disposed at the bottom of the recycling plate (503).

2. The production apparatus for silicon carbide powder by carbothermal synthesis according to claim 1, characterized in that: A gas recovery pipe (405) is provided on one side of the inner wall of the sealed chamber (401), and the gas recovery pipes (405) are symmetrically distributed. A side gas pipe (406) is provided on one side of the gas recovery pipe (405). The top and bottom of the outer wall of the filter screen (402) are provided with sealing rings (407). The outer wall of the stirring rod body (3) is provided with a linkage wheel (408).

3. The production apparatus for producing silicon carbide powder by carbothermal synthesis according to claim 2, characterized in that: Each of the sealing rings (407) is provided with a clamping block (501) at the top, and a brush (502) is provided at the bottom of the outer wall of the clamping block (501). A spring (505) is connected to the bottom of the outer wall of the pressure plate (504); The pressure plate (504) is provided with a feed pipe (506) on its outside.

4. The production apparatus for silicon carbide powder by carbothermal synthesis according to claim 1, characterized in that: The main exhaust pipe (403) is provided with a cavity; The filter (402) and the sealing ring (407) both penetrate the cavity of the main exhaust pipe (403); The gas guide plate (404) covers the outside of the cavity of the main exhaust pipe (403).

5. A production apparatus for producing silicon carbide powder by carbothermal synthesis according to claim 2, characterized in that: The gas guide plate (404) is provided with a cavity; The filter (402) and the sealing ring (407) penetrate the cavity of the gas guide plate (404); One end of the gas recovery pipe (405) is located between the gas guide plate (404) and the main exhaust pipe (403).

6. The production apparatus for silicon carbide powder by carbothermal synthesis according to claim 2, characterized in that: The other end of the gas recovery pipe (405) is connected to the main exhaust pipe (403); One end of the side air tube (406) passes through the sealed chamber (401). The other end of the side air pipe (406) is connected to the main exhaust pipe (403).

7. A production apparatus for producing silicon carbide powder by carbothermal synthesis according to claim 3, characterized in that: The sealing ring (407) is clamped to the inner wall of the clamping block (501); The sealing ring (407) is movably connected to the clamping block (501); The clamping block (501) is connected to the inner wall of the sealing chamber (401).

8. A production apparatus for producing silicon carbide powder by carbothermal synthesis according to claim 2, characterized in that: The outer wall of the sealing ring (407) is in contact with the outer wall of the linkage wheel (408); The sealing ring (407) and the linkage wheel (408) are both made of flexible graphite.

9. A production apparatus for producing silicon carbide powder by carbothermal synthesis according to claim 3, characterized in that: One side of the outer wall of the brush (502) is in contact with the outer wall of the filter screen (402); The bottom of the recycling plate (503) is aligned with the bottom of the brush (502).

10. A production apparatus for producing silicon carbide powder by carbothermal synthesis according to claim 3, characterized in that: The outer walls of the pressure plate (504) are rounded on both sides; The arc angles on both sides of the outer wall of the pressure plate (504) are opposite; The feed pipe (506) is in communication with the inner wall of the reaction vessel body (1).

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