Multi-stage purification equipment for silicon carbide micro powder

Abstract

The invention belongs to the technical field of silicon carbide micro-powder purification, and particularly relates to silicon carbide micro-powder multi-stage purification equipment which comprises a pulverizer, a belt conveyor, a washing kettle, a grinding pump, an acid-base reaction kettle, a cyclone, a centrifugal machine and a drying machine, the grinding pump comprises a pump body and a supporting seat, the pump body is fixed to one end of the supporting seat, and a pump shaft is arranged on the supporting seat; an impeller is fixed to the front end of the pump shaft and located in an inner cavity of the pump body, a movable grinding ring surrounding the impeller is fixed to the back of the impeller, a fixed grinding ring surrounding the movable grinding ring is fixed to the inner cavity of the pump body, and the fixed grinding ring and the movable grinding ring are meshed with each other. Through the two steps of acid washing and alkali washing, various impurities in silicon carbide are effectively removed, and the purity of the product is improved. When the grinding pump circularly pumps materials, pumped silicon carbide is ground through the movable grinding ring and the fixed grinding ring in the pump body, the granularity of the silicon carbide is refined, and the silicon carbide is more uniform.

Description

Technical Field

[0001] The invention belongs to the technical field of silicon carbide micropowder purification, in particular to a multi-stage silicon carbide micropowder purification device. Background Art

[0002] Silicon carbide is a compound material composed of silicon and carbon. In addition to being used as an abrasive, it can also be used as a heat-resistant and corrosion-resistant material in various fields. In a resistance furnace, a mixture of quartz sand and petroleum coke with a high fixed carbon content is heated to a high temperature (such as about 2500°C) to cause a reduction reaction to occur, generating silicon carbide.

[0003] The Chinese utility model patent with publication number CN215918188U provides a silicon carbide micropowder purification and grading device, which includes a purification and grading mechanism body, a water curtain atomization treatment box, a precipitation grading export mechanism, a micropowder purification and filtering mechanism, and a grading export and screening mechanism. A water curtain atomization treatment box is provided at one end of the purification and grading mechanism body, a precipitation grading export mechanism is provided at the bottom end of the side of the water curtain atomization treatment box, a grading export and screening mechanism is provided at the bottom end of the precipitation grading export mechanism, and a micropowder purification and filtration mechanism is provided on the side of the grading export and screening mechanism.

[0004] The device mainly uses water immersion method to remove impurities in silicon carbide powder. The specific process includes: 1. Place silicon carbide powder in a water curtain atomization treatment box and suspend the powder in water through the action of water mist; 2. Using the characteristics of micro powders suspending and settling in water, micro powders of different particle sizes are preliminarily classified; 3. The purified micro powder is exported through the grading conduit, and further filtered and screened to obtain silicon carbide micro powder products of different particle sizes.

[0005] The density of silicon carbide is usually between 3.20g / cm³ and 3.25g / cm³, which is much greater than the density of water (about 1g / cm³). Therefore, the suspension and sedimentation effect of silicon carbide powder in water is not ideal, which will affect the effect of purification and classification. In addition, the water immersion method is mainly suitable for removing impurities soluble in water, but for insoluble impurities in silicon carbide powder (such as certain metal oxides, silicates, etc.), this method cannot effectively remove them. Summary of the invention

[0006] In view of the problems existing in the purification process of silicon carbide micropowder, the present invention proposes a multi-stage purification device for silicon carbide micropowder, aiming to achieve efficient purification of silicon carbide micropowder, which is specifically achieved through the following technical solutions: A multi-stage purification device for silicon carbide micropowder comprises a pulverizer, a belt conveyor, a water washing kettle, an acid-base reaction kettle, a cyclone, a centrifuge and a dryer in the order of purification of silicon carbide micropowder; a grinding pump connected to a liquid outlet of the water washing kettle is provided on one side of the water washing kettle, one end of the grinding pump is connected to a feed inlet of the acid-base reaction kettle through a delivery pipe, a three-way ball valve is provided on the delivery pipe, and the three-way ball valve is connected to a reflux port of the water washing kettle through a pipeline; an acid-base resistant pump connected to a liquid outlet of the acid-base reaction kettle is provided on one side of the acid-base reaction kettle, one end of the acid-base resistant pump is connected to a feed inlet of a cyclone through a pipeline; the grinding pump comprises a pump body and a support seat, the pump body is fixed to one end of the support seat, a pump shaft is provided on the support seat, an impeller is fixed to the front end of the pump shaft, the impeller is located in the inner cavity of the pump body, a dynamic grinding ring surrounding the impeller is fixed to the back of the impeller, a fixed grinding ring surrounding the dynamic grinding ring is fixed to one side of the inner cavity of the pump body, and the fixed grinding ring and the dynamic grinding ring are engaged with each other.

[0007] Preferably, the impeller includes an arc-shaped ring seat 1 and an arc-shaped ring seat 2 sleeved inside the impeller, the arc-shaped ring seat 2 is fixedly connected to the pump shaft, the front end face of the arc-shaped ring seat 2 is provided with a plurality of groups of fan blades connected to the arc-shaped ring seat 1, and a plurality of circumferentially distributed grinding portions 1 are provided between the outer edge of the arc-shaped ring seat 2 and the outer edge of the arc-shaped ring seat 1.

[0008] Preferably, the dynamic grinding ring includes a ring seat 1, and the outer edge of the ring seat 1 is provided with a plurality of arc-shaped grinding teeth 1 distributed circumferentially, all the arc-shaped grinding teeth 1 together constitute a grinding part 2, and an arc-shaped flow channel 3 is formed between adjacent arc-shaped grinding teeth 1.

[0009] Preferably, the fixed grinding ring includes a ring seat 2, the outer edge of the ring seat 2 is provided with a plurality of arc-shaped grinding teeth 2 distributed in a circumferential manner, all of the arc-shaped grinding teeth 2 together constitute a grinding part 3, an arc-shaped flow channel 1 is formed between adjacent arc-shaped grinding teeth 2, the inner edge of the ring seat 2 is provided with a plurality of arc-shaped grinding teeth 3 distributed in a circumferential manner, all of the arc-shaped grinding teeth 3 together constitute a grinding part 4, an arc-shaped flow channel 2 is formed between adjacent arc-shaped grinding teeth 3, a grinding cavity is formed between the grinding part 4 and the grinding part 3, and the grinding part 2 is embedded in the grinding cavity.

[0010] Preferably, the directions of flow channel 2 and flow channel 1 are consistent, and the directions of flow channel 1 and flow channel 3 are opposite.

[0011] Preferably, the width of the flow channel 2 starts from the inner edge of the ring seat 2 and gradually shrinks toward the outer edge of the ring seat 2. The widths of the flow channel 1 and the flow channel 3 are both smaller than the narrowest part of the flow channel 2, and the width of the flow channel 3 is larger than the width of the flow channel 1.

[0012] Preferably, a flow guide seat tangent to the arc-shaped ring seat is fixed to the front end of the pump shaft.

[0013] Preferably, a water inlet pipe is fixed to the front end of the pump body, an embedding groove is provided at one end of the inner cavity of the water inlet pipe, and the front end of the arc-shaped ring seat 1 is embedded in the embedding groove.

[0014] Preferably, an acid supply tank and an alkali supply tank are arranged around the acid-base reaction kettle, and the liquid adding port of the acid-base reaction kettle is connected to a three-way ball valve 2 through a delivery pipe 2, and the two valve ports of the three-way ball valve 2 are respectively connected to the acid supply tank and the alkali supply tank through pipelines.

[0015] Preferably, a belt magnetic separator is installed above the belt conveyor.

[0016] After adopting the above technical solution, the beneficial effects of the present invention are: Through the two steps of water washing and acid-base washing, various impurities in silicon carbide are effectively removed, and the purity of the product is improved. The use of cyclones and centrifuges realizes the particle size classification and dehydration of silicon carbide, ensuring that the particle size distribution of the product meets the requirements. While pumping the material, the grinding pump uses the dynamic grinding ring and fixed grinding ring in the pump body to grind the pumped silicon carbide, refining the particle size of silicon carbide and making it more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a work flow chart of the present invention; Figure 2 It is the structural schematic diagram of the grinding pump; Figure 3 for Figure 2 Another perspective of the picture; Figure 4 is a schematic diagram of the structure of the grinding assembly; Figure 5 is a schematic diagram of the structure of the impeller; Figure 6 It is a schematic diagram of the structure of the water inlet pipe; Figure 7 is a cross-sectional view of a grinding assembly; Figure 8 It is the structural schematic diagram of the fixed grinding ring; Fig. 9 This is a schematic diagram of the structure of the dynamic grinding ring.

[0019] Figure numerals: 1-crusher, 2-belt conveyor, 3-belt magnetic separator, 4-water washing kettle, 5-grinding pump, 6-three-way ball valve 1, 7-delivery pipe 1, 8-acid-base reaction kettle, 9-acid-base resistant pump, 10-delivery pipe 2, 11-three-way ball valve 2, 12-cyclone, 13-acid supply tank, 14-centrifuge, 15-alkali supply tank, 16-pump body, 17-water inlet pipe, 18-flow guide seat , 19-fixed grinding ring, 20-dynamic grinding ring, 21-pump shaft, 22-support seat, 23-rear end cover, 24-impeller, 25-grinding part one, 26-arc ring seat one, 27-arc ring seat two, 28-blade, 29-embedded groove, 30-arc grinding tooth one, 31-arc grinding tooth two, 32-arc grinding tooth three, 33-flow channel one, 34-flow channel two, 35-grinding chamber, 36-flow channel three. DETAILED DESCRIPTION

[0020] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0021] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0022] The present invention proposes a multi-stage purification device for silicon carbide micropowder, aiming to achieve efficient purification of silicon carbide micropowder. Figure 1 As shown, according to the purification sequence of silicon carbide micropowder, the silicon carbide micropowder multi-stage purification equipment includes a pulverizer 1, a belt conveyor 2, a water washing kettle 4, an acid-base reaction kettle 8, a cyclone 12, a centrifuge 14 and a dryer which are arranged in sequence.

[0023] The crusher 1 crushes the original silicon carbide block material into micro powder, providing uniform raw materials for the subsequent purification step. The belt conveyor 2 feeds the crushed silicon carbide micro powder into the feed port of the water washing kettle 4 to achieve continuous production. A belt magnetic separator 3 is set above the belt conveyor 2, which can efficiently remove ferromagnetic impurities in the silicon carbide micro powder and improve the product quality of the silicon carbide micro powder.

[0024] A grinding pump 5 connected to the liquid outlet of the water washing kettle 4 is provided on one side of the bottom thereof, and one end of the grinding pump 5 is connected to the feed port of the acid-base reaction kettle 8 through a delivery pipe 7. A three-way ball valve 6 is provided on the delivery pipe 7, and the three-way ball valve 6 is connected to the reflux port of the water washing kettle 4 through a pipeline.

[0025] The silicon carbide powder is first passed through a belt magnetic separator 3 to remove ferromagnetic impurities. After the impurities are removed, the silicon carbide powder is sent to the feed port of the water washing kettle 4 by the belt conveyor 2. According to the amount of silicon carbide powder input, add an appropriate amount of water to the water washing kettle 4. Start the stirring device in the water washing kettle 4 to fully stir the material to ensure that the silicon carbide powder can be evenly dispersed in the water to form silicon carbide slurry. During the stirring process, the grinding pump 5 starts to work, extracts the silicon carbide slurry from the water washing kettle 4, and grinds the silicon carbide slurry for the first time during the transportation process. By adjusting the opening state of the three-way ball valve 6, the silicon carbide slurry after the initial grinding is transported back to the water washing kettle 4, and then extracted and ground for the second time. Through multiple cycles of grinding, it is ensured that the silicon carbide particles can be fully refined to improve the fineness and uniformity of the product.

[0026] A pH monitor is provided inside the acid-base reactor 8, and an acid-base resistant pump 9 connected to its liquid outlet is provided on one side of its bottom, and one end of the acid-base resistant pump 9 is connected to the feed port of the cyclone 12 through a pipeline. An acid liquid supply tank 13 and an alkali liquid supply tank 15 are provided around the acid-base reactor 8, and the liquid addition port of the acid-base reactor 8 is connected to a three-way ball valve 11 through a delivery pipe 10, and the two valve ports of the three-way ball valve 11 are respectively connected to the acid liquid supply tank 13 and the alkali liquid supply tank 15 through pipelines.

[0027] By adjusting the opening state of the three-way ball valve 16, the silicon carbide slurry in the water washing kettle 4 is pumped out by the grinding pump 5 and sent to the acid-base reactor 8. Start the stirring device of the acid-base reactor 8 to stir the silicon carbide slurry. Adjust the opening state of the three-way ball valve 211, and the acid supply tank 13 sends the acid into the acid-base reactor 8 until the pH value of the silicon carbide slurry reaches the preset value of the pH monitor, and then the three-way ball valve 211 is closed. Through the pickling treatment, impurities such as metal oxides and silicates in the silicon carbide slurry can be effectively removed to improve the purity and quality of the product. After the pickling is completed, the pickling liquid is first drained, and then the opening state of the three-way ball valve 211 is adjusted, and the alkali liquid supply tank 15 sends the alkali liquid into the acid-base reactor 8 until the pH value of the silicon carbide slurry reaches the preset value of the pH monitor, and then the three-way ball valve 211 is closed. Through alkaline washing treatment, not only can the pH value of silicon carbide slurry be balanced and excess acid be neutralized, but also impurities such as free silicon and silicon dioxide can be effectively removed, further improving the purity and quality of the product.

[0028] The silicon carbide slurry after alkali washing is sent to the cyclone 12 through the acid and alkali resistant pump 9 to screen the silicon carbide powder and separate the impurities in the silicon carbide slurry. The separated silicon carbide slurry is sent to the centrifuge 14 for dehydration to remove the moisture therein. The dehydrated silicon carbide is sent to the dryer for drying to ensure that the final moisture content of the product meets the requirements.

[0029] like Figure 2 and Figure 3 As shown, the grinding pump 5 includes a pump body 16 and a support seat 22. The front and rear ends of the pump body 16 are respectively provided with an opening, the front end opening of the pump body 16 is fixedly connected to the water inlet pipe 17, and the rear end opening of the pump body 16 is fixedly connected to the rear end cover 23 for sealing. One end of the support seat 22 is fixedly connected to the rear end cover 23, and a pump shaft 21 is provided on the support seat 22. An impeller 24 is fixed to the front end of the pump shaft 21, and the rear end of the pump shaft 21 is connected to the motor through a coupling. The impeller 24 is located in the inner cavity of the pump body 16, and a dynamic grinding ring 20 surrounding the impeller 24 is fixed to the back of the impeller 24, and a fixed grinding ring 19 surrounding the dynamic grinding ring 20 is fixed to one side of the inner cavity of the pump body 16, and the fixed grinding ring 19 and the dynamic grinding ring 20 are engaged with each other.

[0030] The impeller 24 includes an arc-shaped ring seat 1 26 and an arc-shaped ring seat 27 sleeved therein. The arc-shaped ring seat 27 is fixedly connected to the pump shaft 21. The front end surface of the arc-shaped ring seat 27 is provided with a plurality of groups of fan blades 28 connected to the arc-shaped ring seat 1 26. A plurality of grinding parts 1 25 distributed around the outer edge of the arc-shaped ring seat 27 and the outer edge of the arc-shaped ring seat 1 26 are provided. An interlocking groove 29 is provided at one end of the inner cavity of the water inlet pipe 17, and the front end of the arc-shaped ring seat 1 26 is embedded in the interlocking groove 29. The close fit between the interlocking groove 29 and the arc-shaped ring seat 1 26 reduces the obstruction of the fluid before entering the impeller 24, ensuring the smooth flow of the fluid. The front end of the pump shaft 21 is fixed with a guide seat 18 tangent to the arc-shaped ring seat 27, which plays the role of "breaking the flow", helps to reduce the impact and vortex of the fluid at the entrance of the impeller 24, and guides the fluid to enter the impeller 24 at a specific angle and direction.

[0031] The movable grinding ring 20 includes a ring seat 1. The outermost edge of the ring seat 1 is provided with a plurality of arc-shaped grinding teeth 1 30 distributed around, and these arc-shaped grinding teeth 1 30 together constitute the grinding part 2 of the movable grinding ring 20. Between adjacent arc-shaped grinding teeth 1 30, an arc-shaped flow channel 3 36 is formed to guide the flow of fluid medium (such as silicon carbide slurry) between the movable grinding ring 20 and the fixed grinding ring 19.

[0032] The fixed grinding ring 19 includes a ring seat 2. The outermost edge of the ring seat 2 is provided with a plurality of arc-shaped grinding teeth 2 31 distributed around, and these arc-shaped grinding teeth 2 31 together constitute the grinding part 3 of the fixed grinding ring 19, and an arc-shaped flow channel 1 33 is formed between adjacent arc-shaped grinding teeth 2 31. The innermost edge of the ring seat 2 is provided with a plurality of arc-shaped grinding teeth 3 32 distributed around, and these arc-shaped grinding teeth 3 32 together constitute the grinding part 4 of the fixed grinding ring 19, and an arc-shaped flow channel 2 34 is formed between adjacent arc-shaped grinding teeth 3 32. A grinding cavity 35 is formed between the grinding part 4 and the grinding part 3, and the grinding part 2 is embedded in the grinding cavity 35.

[0033] The impeller 24 rotates at high speed, and the suction force generated sucks the silicon carbide slurry into the interior of the pump body 16. At the same time, the rotation of the impeller 24 also drives the dynamic grinding ring 20 connected thereto to rotate synchronously. The sucked silicon carbide slurry is thrown out from the opening between the adjacent grinding parts 25, and the silicon carbide slurry then enters the grinding area between the grinding part 25 and the grinding part 4 for the first grinding. The silicon carbide slurry after the first grinding passes through the flow channel 2 34 and enters the grinding area between the grinding part 4 and the grinding part 2 for the second grinding. The silicon carbide slurry after the second grinding passes through the flow channel 3 36 and enters the grinding area between the grinding part 2 and the grinding part 3 for the third grinding. After three grindings, the silicon carbide slurry has become very fine and uniform. Finally, the silicon carbide slurry is thrown out of the grinding area from the flow channel 1 33 to complete the entire grinding process.

[0034] In order to improve the grinding effect, the spacing between grinding section 1 25 and grinding section 4, the spacing between grinding section 4 and grinding section 2, and the spacing between grinding section 2 and grinding section 3 are reduced in sequence. The spacing between grinding section 1 25 and grinding section 4 is the first grinding spacing. Too large a spacing may lead to insufficient grinding, too large slurry particles or uneven grinding; too small a spacing may cause blockage. After the first grinding, the particle size of the silicon carbide slurry has been reduced. By reducing the spacing between grinding section 4 and grinding section 2, the grinding effect can be further enhanced and the slurry particles can be further refined. In the final stage of the grinding process, the slurry particles are already relatively small. In order to obtain the final high-quality and uniformly fine silicon carbide product, the spacing between grinding section 2 and grinding section 3 needs to be set to the minimum value. In this way, the slurry will be subjected to the strongest shearing and grinding action, thereby achieving the best grinding effect.

[0035] The direction of flow channel 2 34 is consistent with that of flow channel 1 33, and the direction of flow channel 1 33 is opposite to that of flow channel 3 36. The width of flow channel 2 34 starts from the inner edge of ring seat 2 and gradually shrinks toward the outer edge of ring seat 2. The widths of flow channel 1 33 and flow channel 3 36 are both smaller than the narrowest part of flow channel 2 34, and the width of flow channel 3 36 is larger than the width of flow channel 1 33. By extending the residence time of silicon carbide slurry in each grinding area, it is subjected to more shearing and grinding, thereby improving the grinding efficiency. A longer residence time helps the slurry to be more evenly distributed and flow in the grinding area, thereby improving the grinding uniformity.

[0036] According to the embodiments of the present invention as described above, these embodiments do not describe all the details in detail, nor do they limit the invention to specific embodiments. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and the modified use based on the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-stage purification device for silicon carbide micropowder, comprising, in order of purification of silicon carbide micropowder, a pulverizer (1), a belt conveyor (2), a water washing kettle (4), an acid-base reaction kettle (8), a cyclone (12), a centrifuge (14) and a dryer; characterized in that: A grinding pump (5) connected to the liquid outlet of the water washing kettle (4) is provided on one side of the water washing kettle (4); one end of the grinding pump (5) is connected to the feed port of the acid-base reaction kettle (8) via a delivery pipe (7); a three-way ball valve (6) is provided on the delivery pipe (7); the three-way ball valve (6) is connected to the reflux port of the water washing kettle (4) via a pipeline; an acid-base resistant pump (9) connected to the liquid outlet of the acid-base reaction kettle (8) is provided on one side of the acid-base reaction kettle (8); one end of the acid-base resistant pump (9) is connected to the feed port of the cyclone (12) via a pipeline; the grinding pump (5) comprises a pump body (16) and a support seat (22), the pump body (16) being fixed to one end of the support seat (22), the support seat (22) being provided with a pump shaft (21), the front end of the pump shaft (21) being fixed with an impeller (24), the impeller (24) being located in the inner cavity of the pump body (16), the back of the impeller (24) being fixed with a dynamic grinding ring (20) surrounding the impeller (24), and one side of the inner cavity of the pump body (16) being fixed with a fixed grinding ring (19) surrounding the dynamic grinding ring (20), the fixed grinding ring (19) and the dynamic grinding ring (20) being engaged with each other.

2. The multi-stage purification equipment for silicon carbide micropowder according to claim 1, characterized in that: The impeller (24) comprises an arc-shaped ring seat 1 (26) and an arc-shaped ring seat 2 (27) sleeved therein, the arc-shaped ring seat 2 (27) being fixedly connected to the pump shaft (21), a front end surface of the arc-shaped ring seat 2 (27) being provided with a plurality of groups of blades (28) connected to the arc-shaped ring seat 1 (26), and a plurality of circumferentially distributed grinding portions 1 (25) being provided between the outer edges of the arc-shaped ring seat 2 (27) and the outer edges of the arc-shaped ring seat 1 (26).

3. The multi-stage purification equipment for silicon carbide micropowder according to claim 2, characterized in that: The dynamic grinding ring (20) comprises a ring seat 1, the outer edge of which is provided with a plurality of arc-shaped grinding teeth 1 (30) distributed in a circumferential manner, all of which together form a grinding portion 2, and arc-shaped flow channels 3 (36) are formed between adjacent arc-shaped grinding teeth 1 (30).

4. The multi-stage purification equipment for silicon carbide micropowder according to claim 3, characterized in that: The fixed grinding ring (19) includes a ring seat 2, the outer edge of the ring seat 2 is provided with a plurality of arc-shaped grinding teeth 2 (31) distributed in a circumferential manner, all the arc-shaped grinding teeth 2 (31) together form a grinding portion 3, an arc-shaped flow channel 1 (33) is formed between adjacent arc-shaped grinding teeth 2 (31), the inner edge of the ring seat 2 is provided with a plurality of arc-shaped grinding teeth 3 (32) distributed in a circumferential manner, all the arc-shaped grinding teeth 3 (32) together form a grinding portion 4, an arc-shaped flow channel 2 (34) is formed between adjacent arc-shaped grinding teeth 3 (32), a grinding cavity (35) is formed between the grinding portion 4 and the grinding portion 3, and the grinding portion 2 is embedded in the grinding cavity (35).

5. The multi-stage purification equipment for silicon carbide powder according to claim 4, characterized in that: The direction of the flow channel 2 (34) is consistent with that of the flow channel 1 (33), and the direction of the flow channel 1 (33) is opposite to that of the flow channel 3 (36).

6. The multi-stage purification equipment for silicon carbide powder according to claim 5, characterized in that: The width of the flow channel 2 (34) starts from the inner edge of the ring seat 2 and gradually shrinks towards the outer edge of the ring seat 2. The widths of the flow channel 1 (33) and the flow channel 3 (36) are both smaller than the narrowest part of the flow channel 2 (34). The width of the flow channel 3 (36) is larger than the width of the flow channel 1 (33).

7. The multi-stage purification equipment for silicon carbide micropowder according to claim 2, characterized in that: A flow guide seat (18) tangential to the second arc-shaped ring seat (27) is fixed to the front end of the pump shaft (21).

8. The multi-stage purification equipment for silicon carbide powder according to claim 7, characterized in that: A water inlet pipe (17) is fixed to the front end of the pump body (16), an embedding groove (29) is provided at one end of the inner cavity of the water inlet pipe (17), and the front end of the arc-shaped ring seat (26) is embedded in the embedding groove (29).

9. The multi-stage purification equipment for silicon carbide powder according to claim 1, characterized in that: An acid liquid supply tank (13) and an alkali liquid supply tank (15) are arranged around the acid-base reaction kettle (8); a liquid filling port of the acid-base reaction kettle (8) is connected to a three-way ball valve (11) via a second delivery pipe (10); and two valve ports of the second three-way ball valve (11) are respectively connected to the acid liquid supply tank (13) and the alkali liquid supply tank (15) via pipelines.

10. The multi-stage purification equipment for silicon carbide powder according to claim 1, characterized in that: A belt-type magnetic separator (3) is mounted above the belt conveyor (2).

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