Silicon carbide grinding system and method for producing silicon carbide micro powder

Abstract

The silicon carbide grinding system of the present application is composed of a grinding assembly, a transfer bin and a settling assembly, so that the silicon carbide slurry forms a self-grinding cycle and a recycled material cycle in the system, and the silicon carbide raw material is 800-2000 mesh silicon carbide, preferably D 50 The particle size is 6.7-14 um, the silicon carbide slurry is adjusted in the transfer bin, at least 90% of the silicon carbide slurry is ground to the process particle size in the grinding assembly, the ground silicon carbide slurry is settled and layered in the settling assembly, the bottom layer is recycled material, and the upper layer is process material, the recycled material enters the transfer bin through the recycled material pipe, the process material is extracted through the extraction outlet, and the recycled material enters a new round of grinding after being introduced into the transfer bin. The final silicon carbide particles are all process materials, thus reducing the waste of silicon carbide and greatly reducing the cost of enterprises.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of silicon carbide grinding, and particularly relates to a silicon carbide grinding system and a production method of silicon carbide micro powder. BACKGROUND

[0002] Silicon carbide is a "three-resistant" material. Due to the characteristics of silicon carbide, such as corrosion resistance, high temperature resistance, high strength, good heat conduction performance and impact resistance, silicon carbide is widely used. Some enterprises have special requirements for the classification of silicon carbide micro powder, and need to ensure the uniformity of the particle size of the silicon carbide micro powder.

[0003] In the prior art, a silicon carbide micro powder grinding system and a use method thereof are disclosed in Chinese Patent No. CN113546728A. The system comprises a storage tank, a feeding pipe is arranged on the lower end side wall of the storage tank, a first feeding pump is arranged on the feeding pipe, a grinding mechanism is connected to the feeding pipe, a discharge pipe is arranged between the upper end of the grinding mechanism and the upper end of the storage tank, an air inlet pipe is connected to the lower end of the grinding mechanism, a fan is arranged on the air inlet pipe, a plurality of medium storage tanks are arranged in parallel on the air inlet pipe between the fan and the grinding mechanism, different medium storage tanks are used to store carbonized silicon media with different particle sizes, a control box is arranged on one side of the grinding mechanism, a control panel is connected to the control box, and the control box is electrically connected to the first feeding pump, the grinding mechanism and the fan. The above grinding system adopts a dry method to grind silicon carbide. However, in the dry grinding process, the grinding of silicon carbide is insufficient. If 0.5 um to 0.7 um silicon carbide is obtained, the silicon carbide will be wasted, thereby increasing the cost of enterprises. SUMMARY

[0004] Therefore, the application provides a silicon carbide grinding system and a production method of silicon carbide micro powder, which solves the technical problem that in the dry grinding process, the grinding of silicon carbide is insufficient, if 0.5 um to 0.7 um silicon carbide is obtained, the silicon carbide will be wasted, thereby increasing the cost of enterprises.

[0005] The technical scheme for solving the above technical problem is as follows:

[0006] A silicon carbide grinding system comprises

[0007] The transfer bin is provided with a feeding pipe and a discharge pipe, and is used for adjusting silicon carbide slurry;

[0008] The grinding assembly comprises a cylinder and a dispersion mechanism arranged in the cylinder, the cylinder is provided with a feeding end and a discharge end, the discharge end is connected to the feeding pipe, and the feeding end is connected to the discharge pipe;

[0009] The settling assembly is provided with a feeding inlet connected with the discharging pipe, and a return pipe provided at the bottom of the settling assembly and connected with the feeding pipe, and the return pipe is provided with a sampling outlet.

[0010] The ground silicon carbide slurry is settled and stratified in the settling assembly, with the bottom layer being recycled material and the upper layer being process material, the recycled material enters the transfer bin through the return pipe, and the process material is sampled through the sampling outlet.

[0011] The dispersion mechanism comprises a middle shaft, at least two first dispersion discs are mounted on the upper part of the middle shaft, and a first mounting part is formed between adjacent two first dispersion discs; at least two second dispersion discs are mounted on the lower part of the middle shaft, and a second mounting part is formed between adjacent two second dispersion discs; a third mounting part is formed between adjacent first and second dispersion discs; and a plurality of third dispersion discs are mounted in the first, second and third mounting parts.

[0012] The first dispersion disc comprises a first disc body, a plurality of first dispersion components are uniformly arranged along the circumferential direction of the edge of the first disc body, and the first dispersion component has at least one first flow guide slope, so that the medium can receive a vertical downward and horizontal outward component force when colliding with the first flow guide slope.

[0013] The second dispersion disc comprises a second disc body, the second disc body is conical, a plurality of second dispersion components are arranged on the slope of the conical shape in a circumferential direction, and the second dispersion component has at least one second flow guide slope, so that the medium can receive a vertical upward and horizontal outward component force when colliding with the second flow guide slope.

[0014] The third dispersion disc comprises a third disc body, a plurality of isolation columns are arranged on the third disc body, the isolation columns are arranged on the same circumference, and the isolation columns form a double-channel isolation membrane on both sides of the third dispersion disc under high-speed rotation.

[0015] The settling assembly comprises a settling barrel, at least one grading screen is arranged in the settling barrel, the grading screen is arranged obliquely and has intersecting third and fourth flow guide slopes, a flow guide groove is formed at the intersection of the third and fourth flow guide slopes, the settling barrel is provided with a return port, the return port is connected with the feeding pipe, and the bottom end of the flow guide groove is opposite to the return port.

[0016] Preferably, the feeding assembly comprises a first feeding pump and a second feeding pump, the feeding end is connected with the discharging pipe through the first feeding pump, and the feeding pipe is connected with the return pipe through the second feeding pump.

[0017] A method for producing silicon carbide powder, applied to the silicon carbide grinding system of any one of the preceding claims, the method comprising the following steps:

[0018] S1. Preparing silicon carbide slurry in the intermediate bin and detecting the solid content of the silicon carbide slurry until the solid content of the silicon carbide slurry reaches a preset value;

[0019] S2. Slowly injecting the silicon carbide slurry in the intermediate bin into the grinding assembly through the discharge pipe;

[0020] S3. Adding grinding media in the grinding assembly, the grinding media being silicon carbide particles, and the particle size of the silicon carbide particles being 1 mm to 10 mm;

[0021] S4. Grinding the silicon carbide slurry in the grinding assembly, and the ground silicon carbide slurry overflowing from the discharge end of the grinding assembly and entering the intermediate bin through the feeding pipe, continuously circulating until at least 90 % of the silicon carbide slurry in the intermediate bin is ground to a process particle size;

[0022] S5. Introducing the silicon carbide slurry in the intermediate bin into the settling assembly for settling;

[0023] S6. After settling for a preset time, the ground silicon carbide slurry is settled and stratified in the settling assembly, the bottom layer being recycled material and the upper layer being process material, the recycled material entering the intermediate bin through the recycled material pipe, and the process material being extracted through the extraction outlet.

[0024] Preferably, in the S1 step, the preset value is 10 % to 40 %.

[0025] Preferably, in the S1 step, the preparation of the silicon carbide slurry in the intermediate bin comprises the following steps:

[0026] A1. Mixing silicon carbide raw material and water in the intermediate bin, adding a pH adjuster to adjust the pH value to 9 to 12 to obtain an alkaline silicon carbide slurry;

[0027] A2. Adding a dispersing agent in the intermediate bin, mixing and stirring with the alkaline silicon carbide slurry to obtain the silicon carbide slurry.

[0028] Preferably, in the A1 step, the pH adjuster is at least one of NaOH, KOH, and sodium alcoholate.

[0029] Preferably, in the A2 step, the dispersing agent is TMAH.

[0030] The technical scheme adopted in the application can achieve the following beneficial effects:

[0031] The silicon carbide grinding system of the application is composed of a grinding assembly, a transfer bin and a settling assembly, so that the silicon carbide slurry forms a self-grinding cycle and a recycled material cycle in the system, the raw material is 800-2000 mesh silicon carbide, preferably D 50 The particle size is 6.7-14 um, the silicon carbide slurry is adjusted in the transfer bin, at least 90% of the silicon carbide slurry is ground to a process particle size in the grinding assembly, the ground silicon carbide slurry is settled and layered in the settling assembly, the bottom layer is recycled material, and the upper layer is process material, the recycled material enters the transfer bin through the recycled material pipe, the process material is extracted through the extraction outlet (i.e. 0.5-0.7 um silicon carbide particles), the recycled material enters a new round of grinding after being introduced into the transfer bin, and finally all the silicon carbide particles are process material, thereby reducing the waste of silicon carbide and greatly reducing the cost of enterprises. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a schematic diagram of the process of the silicon carbide grinding system equipment.

[0033] Figure 2 It is a schematic diagram of the structure of the settling assembly.

[0034] Figure 3 It is a schematic diagram of the cross-sectional structure of the first dispersing disc.

[0035] Figure 4 It is a schematic diagram of the cross-sectional structure of the second dispersing disc.

[0036] Figure 5 It is a schematic diagram of the structure of the first dispersing disc.

[0037] Figure 6 It is a schematic diagram of the structure of the second dispersing disc.

[0038] Figure 7 It is a schematic diagram of the structure of the third dispersing disc.

[0039] Figure 8 It is a schematic diagram of the structure of the fourth dispersing disc.

[0040] Figure 9 It is a schematic diagram of the cross-sectional structure of the fourth dispersing disc.

[0041] Figure 10 It is a schematic diagram of the structure of the settling assembly.

[0042] Figure 11 It is a schematic diagram of the cross-sectional structure of the settling assembly.

[0043] Figure 12Fig. 1 is a schematic diagram of a classification screen structure.

[0044] Wherein: the grinding assembly 100, the discharge end 101, the feeding end 102, the barrel 103, the middle shaft 104, the first dispersion disc 110, the first disc body 111, the first flow guide slope 112, the second dispersion disc 120, the second disc body 121, the second flow guide slope 122, the third dispersion disc 130, the third disc body 131, the isolation column 132, the fourth dispersion disc 140, the fourth disc body 141, the upper disc body 142, the lower disc body 143, the flow compensation slider 144, the traction shaft 145, the traction connecting rod 146, the first outer shaft 147, the second outer shaft 148, the avoidance cavity 151, the traction cavity 152, the transfer bin 200, the feeding pipe 201, the discharge pipe 202, the settling assembly 300, the feeding inlet 301, the return pipe 302, the sampling outlet 303, the return port 304, the settling barrel 305, the transition barrel 306, the classification screen 310, the third flow guide slope 311, the fourth flow guide slope 312, the flow guide groove 313, the first feeding pump 401, the second feeding pump 402. DETAILED DESCRIPTION

[0045] For the purpose of clarity, the present application will be described in greater detail with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be realized in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the application to those skilled in the art.

[0046] It should be noted that when a device is referred to as being "connected" to another device, it can be directly connected to the other device or can exist through an intermediate device. The terms "inner", "top", "upper", "lower", "up", "down", and similar expressions used herein are for illustrative purposes only and are not intended to be limiting.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0048] The present application will be further described with reference to the drawings and examples.

[0049] Reference will now be made to Figures 1 to 12 The embodiments of the present application disclose, including the transfer bin 200, the grinding assembly 100 and the settling assembly 300, wherein:

[0050] The transfer bin 200 is provided with a feeding pipe 201 and a discharging pipe 202, and is used for adjusting the silicon carbide slurry; wherein the transfer bin 200 is a transfer device, which is provided with the feeding pipe 201 and the discharging pipe 202, and is used for adjusting the silicon carbide slurry, so as to realize the orderly transportation and reasonable distribution of raw materials in the production process.

[0051] The grinding assembly 100 comprises a barrel 103 and a dispersion mechanism arranged in the barrel 103, the barrel 103 is provided with a feeding end 102 and a discharging end 101, the discharging end 101 is connected with the feeding pipe 201, and the feeding end 102 is connected with the discharging pipe 202; wherein the grinding assembly 100 is a grinding device, the barrel 103 is provided with the feeding end 102 and the discharging end 101, the discharging end 101 is connected with the feeding pipe 201 of the transfer bin 200, and the feeding end 102 is connected with the discharging pipe 202 of the transfer bin 200, so that the cyclic grinding and effective transmission of the material can be realized, and the efficiency and stability in the production process are ensured.

[0052] The settling assembly 300 is provided with a feeding inlet 301 connected with the discharging pipe 202, and is provided at the bottom with a return pipe 302 connected with the feeding pipe 201 and provided with a sampling outlet 303; wherein the settling assembly 300 is a settling device, which is internally provided with the feeding inlet 301 connected with the discharging pipe 202 of the transfer bin 200, and is provided at the bottom with the return pipe 302 connected with the feeding pipe 201 of the transfer bin 200 and provided with the sampling outlet 303, so that part of the material can be conveniently recycled and reused in the material settling process, the resource utilization efficiency is improved, and the economy and environmental protection of the production process are ensured.

[0053] The silicon carbide slurry after grinding is settled and stratified in the settling assembly 300, the bottom layer is the recycled material, and the upper layer is the process material, the recycled material enters the transfer bin 200 through the return pipe 302, and the process material is sampled out through the sampling outlet 303.

[0054] In the specific work: first, the silicon carbide slurry is prepared in the transfer bin 200, and the prepared silicon carbide slurry is slowly introduced into the grinding assembly 100 through the discharge pipe 202. After grinding, a small amount of silicon carbide grinding medium is added for continuous grinding. During the grinding process, the silicon carbide with a smaller particle size in the silicon carbide slurry overflows from the discharge end 101 of the grinding assembly 100, enters the transfer bin 200 through the feeding pipe 201, and at the same time, the ungrounded silicon carbide slurry in the transfer bin 200 enters the grinding assembly 100 through the discharge pipe 202. This cycle continues until at least 90% of the silicon carbide slurry in the transfer bin 200 is ground to the process particle size; then the entire silicon carbide slurry in the transfer bin 200 is introduced into the settling assembly 300 through the discharge pipe 202. After settling for a predetermined time, the ground silicon carbide slurry is settled and stratified in the settling assembly 300. The bottom layer is the recovered material, and the upper layer is the process material. First, the recovered material is introduced into the transfer bin 200 through the return pipe 302, and then the process material is extracted through the extraction outlet 303.

[0055] For accurate quantification, as a preferred embodiment, a transition barrel 306 can be installed between the bottom of the settling assembly 300 and the return pipe 302. The recovered material at the bottom of the settling assembly 300 is first introduced into the transition barrel 306. When the transition barrel 306 is filled with silicon carbide slurry, the recovered material is completely discharged from the settling assembly 300. Then the recovered material in the transition barrel 306 is introduced into the transfer bin 200 through the return pipe 302. The volume ratio of the settling barrel 305 to the transition barrel 306 is (25 to 100): 1.

[0056] It should be noted that first, during the grinding process of the silicon carbide slurry, the grinding assembly 100 has a small capacity, so the transfer bin 200 is provided. The preferred volume capacity ratio of the grinding assembly 100 to the transfer bin 200 in the present patent is 1:8. Second, during the settling process of the silicon carbide slurry, the settling time of the settling assembly 300 is 1 h to 200 h, and the preferred settling time in the present patent is 24 h. After settling, the bottom of the settling assembly 300 accumulates silicon carbide particles with a larger particle size. When discharging, a drive valve with metering (flow) can be used, preferably a flow valve. The remaining is the required silicon carbide particles (i.e. process material). Then, the transfer bin 200 is provided with a slurry stirring component for stirring the silicon carbide slurry in the transfer bin 200 to prevent the silicon carbide slurry at the bottom of the transfer bin 200 from being too concentrated or aggregated into a block, causing the slurry to be unable to flow.

[0057] The above-mentioned silicon carbide grinding system enables the silicon carbide slurry to form a self-grinding cycle and a recycled material cycle in the system. The silicon carbide raw material is adjusted into a silicon carbide slurry in the intermediate bin 200, introduced into the grinding assembly 100, and ground to at least 90% of the silicon carbide slurry to a process particle size. The ground silicon carbide slurry is settled and stratified in the settling assembly 300, with the bottom layer being recycled material and the upper layer being process material. The recycled material enters the intermediate bin 200 through the recycled material pipe 302 and enters a new round of grinding. The final silicon carbide particles are all process material, thereby reducing the waste of silicon carbide and greatly reducing the cost of enterprises.

[0058] It should be noted that the self-grinding cycle refers to the raw material being silicon carbide particles and the grinding medium also being silicon carbide particles, only the particle sizes of the two are different. The biggest advantage of self-grinding is that it can reduce impurities. The recycled material cycle refers to generally discarded or useless garbage of large particle size silicon carbide particles. In the present application, the large particle size silicon carbide particles screened out are returned to the grinding assembly 100 through the pipe for continuous grinding, thereby greatly reducing the waste of materials.

[0059] Please refer to Figure 2 、 3 , 5, 6, 7, in a specific embodiment, the dispersion mechanism includes a shaft 104, at least two first dispersion discs 110 are installed on the upper part of the shaft 104, and a first mounting part is formed between adjacent two first dispersion discs 110; at least two second dispersion discs 120 are installed on the lower part of the shaft 104, and a second mounting part is formed between adjacent two second dispersion discs 120; the first dispersion disc 110 and the second dispersion disc 120 have a third mounting part between them; a plurality of third dispersion discs 130 are installed in the first mounting part, the second mounting part and the third mounting part;

[0060] Please refer to Figure 5 , the first dispersion disc 110 includes a first disc body 111, a plurality of first dispersion components are uniformly arranged along the circumferential direction of the edge of the first disc body 111, the first dispersion component has at least one first flow guide slope 112, when the medium collides with the first flow guide slope 112, the medium can receive a vertical downward and horizontal outward force along the first flow guide slope 112, wherein the inclination angle of the first flow guide slope 112 is 1° to 89°, preferably the inclination angle of the flow guide slope is 30° to 60°.

[0061] As preferred, the first dispersion disc 110 is made of a circular cake, i.e. a first disc body 111, which is uniformly cut along the outer edge of the first disc body 111 at equal intervals, so that the outer edge of the first disc body 111 forms a plurality of equidistant sawteeth, which are rectangular or square, and the sawteeth are the first dispersion components of the present application, and the number of the dispersion components is 2 to 12. A cutting machine is used to cut off one corner of the rectangular or square outwardly, so that each dispersion component has a flow guide slope.

[0062] When the flow guide slope is cut by the cutting machine, it is preferred to cut downward along the diagonal of the rectangular or square of the first dispersion component, and the cut flow guide slope is a quadrilateral, wherein two non-adjacent sides of the quadrilateral are parallel lines, and the whole quadrilateral is a trapezoidal shape.

[0063] The first dispersion disc 110 can be installed on the upper part or middle part of the cylinder body 103 during use, and the first flow guide slope 112 is downward.

[0064] Please refer to Figure 6 The second dispersion disc 120 includes a second disc body 121, which is conical, and a plurality of second dispersion components are arranged on the inclined surface of the cone along the vertex at intervals in the circumferential direction, and the second dispersion component has at least one second flow guide slope 122, so that the medium can be subjected to vertical upward and horizontal outward components when colliding with the second flow guide slope 122; wherein the second dispersion disc 120 is mainly installed at the bottom of the cylinder body 103 to prevent the material from depositing on the wheel body, therefore, the second disc body 121 of the second dispersion disc 120 is conical, and the cone angle of the cone is 30 ° to 180 °, and the size of the cone angle is determined by different materials, and the cone angle is different for different materials; a plurality of second dispersion components are arranged on the inclined surface of the cone along the vertex at intervals in the circumferential direction, and the interval between the dispersion components forms a flow guide groove, which can prevent the slurry from depositing on the dispersion disc, and the dispersion components can be uniformly or non-uniformly distributed on the dispersion disc, and the present application preferably uniformly distributes the dispersion components on the second disc body 121, and the number of the dispersion components is 2 to 12.

[0065] The second dispersion component is an irregular polyhedron, wherein one face is combined with the conical surface of the second disc body 121, one side of the second dispersion component is a plane, and the other side is an inclined surface or an inclined surface plus a straight surface, and the second dispersion component has at least one second flow guide slope 122, and the inclination angle of the second flow guide slope 122 is 1 ° to 89 °, and preferably the inclination angle of the flow guide slope is 30 ° to 60 °.

[0066] As a preferred, when the second dispersion part of the second dispersion disc 120 is a right trapezoid, the right trapezoid corresponds to be inverted on the second disc body 121, the slope of the trapezoid combines with the slope of the second disc body 121 correspondingly, and a slope is cut on the surface with four right angles as the second flow guide slope 122.

[0067] When the second dispersion disc 120 is viewed from the front, the dispersion parts are arranged along the circumferential direction of the center and are combined with the second disc body 121, the dispersion parts are in a triangular shape, one angle of the triangle is gathered to the center, and a slope in a quadrilateral shape is beside the triangle; when the dispersion disc is viewed from the top, the second disc body 121 is in a conical shape, and the upper surfaces of the dispersion parts are on the same horizontal line.

[0068] The second dispersion disc 120 is generally installed at the bottom of the cylinder body 103, the slope of the second flow guide slope 122 is installed upward, and can be used with other dispersion discs, when the medium in the cylinder body 103 circulates to the bottom, under the condition that the flow guide dispersion disc rotates at a high speed, when the medium collides with the second flow guide slope 122, the medium can be subjected to a vertical upward and horizontal outward force along the second flow guide slope 122, so as to provide a lifting force for the material, make the rotating flow flow upward, and can carry the material upward, without remaining at the bottom of the cylinder body 103, and the material will not be deposited on the flow guide dispersion disc when the grinding assembly 100 does not work.

[0069] Please refer to Figure 7 The third dispersion disc 130 includes a third disc body 131, a plurality of isolation columns 132 are arranged on the third disc body 131, the isolation columns 132 are arranged on the same circumference, under the high-speed rotation of the isolation columns 132, the grinding liquid forms a double-channel isolation film on both sides of the third dispersion disc 130. Among them, under the high-speed rotation of the isolation columns 132, a double-channel isolation film with one big and one small, one inside and one outside is formed, which can prevent the internal and external medium from interacting at will, form an internal turbulent interval and an external turbulent interval, so that the turbulent flow is orderly and controllable, and the purpose of isolation and order is achieved. The isolation columns 132 penetrate the third disc body 131, form upper isolation columns 132 above the third disc body 131, and form lower isolation columns 132 below the third disc body 131.

[0070] As preferred, the process of the third dispersion disc 130 is as follows: a plurality of isolation columns 132 are prepared, the isolation columns 132 are cylindrical, each isolation column 132 is equal in size, and the two ends of the isolation column 132 are polished into round corners; a round cake, i.e., a third disc body 131, is prepared, the mounting positions of the isolation columns 132 are positioned along the same circumferential track of the third disc body 131, each position is labeled, the distance between each position is equal, and an isolation hole is punched at the labeled position, the size of the isolation hole is just enough for the isolation column 132 to pass through; the prepared isolation column 132 is mounted on the third disc body 131 through the isolation hole, and the upper part of the third disc body 131 is the upper isolation column 132, and the lower part of the third disc body 131 is the lower isolation column 132.

[0071] The height of the isolation column 132 is 0.5 to 1 times the thickness of the third disc body 131, and the diameter of the isolation column 132 is 5% to 20% of the diameter of the third disc body 131. For example, when the diameter of the third disc body 131 is 40 cm and the thickness is 5 cm, the height of the isolation column 132 is preferably 4 cm, and the diameter is 2.5 cm, which is optimal.

[0072] The number of isolation columns 132 is 2 to 12, and preferably 4 to 8, and the two ends of the isolation column 132 are polished into round corners, which can improve the wear resistance of the isolation column 132 and reduce the loss of the third dispersion disc 130, and the isolation column 132 is preferably a round corner of 0 mm to 2 mm.

[0073] As preferred, the third dispersion disc 130 is installed inside the barrel 103 during use, and when the third dispersion disc 130 is running at high speed, the grinding liquid forms two channels of inside and outside and size on both sides of the third dispersion disc 130, so that the medium slurry cannot flow randomly, but only circulates with the turbulent flow in the barrel 103, and therefore the turbulent flow is orderly and controllable, achieving the purpose of isolation and control.

[0074] In one case, for example, a first dispersion disc 110 is installed at the uppermost end of the central shaft 104, a second dispersion disc 120 is installed at the lowermost end of the central shaft 104, and a plurality of third dispersion discs 130 are installed between the first dispersion disc 110 and the second dispersion disc 120. It is worth emphasizing that in this case, since there is only one first dispersion disc 110 and one second dispersion disc 120 in the barrel 103, there is no first mounting portion and no second mounting portion.

[0075] In another case, when the middle shaft 104 is longer, in order to further strengthen the turbulent flow velocity, a first dispersion disc 110 is installed at the uppermost end and the middle of the middle shaft 104, and a second dispersion disc 120 is installed at the lowermost end of the middle shaft 104, at this time, the first dispersion disc 110 installed at the uppermost end and the middle of the middle shaft 104 constitutes a first installation part, and the first dispersion disc 110 installed at the middle of the middle shaft 104 and the second dispersion disc 120 installed at the lowermost end constitute a third installation part, because there is only one second dispersion disc 120, there is no second installation part, and a plurality of third dispersion discs 130 are installed between the first installation part and the third installation part, respectively.

[0076] In another case, in order to further improve the grinding effect of the material, a first dispersion disc 110 is installed at the uppermost end of the middle shaft 104 from top to bottom; a first dispersion disc 110 is installed at one fourth of the middle shaft 104; a second dispersion disc 120 is installed at three fourths of the middle shaft 104; a second dispersion disc 120 is installed at the bottom of the middle shaft 104; the first installation part is constituted between two adjacent first dispersion discs 110, the second installation part is constituted between two adjacent second dispersion discs 120, and the third installation part is constituted between the first dispersion disc 110 at one fourth of the middle shaft 104 and the second dispersion disc 120 at three fourths of the middle shaft 104, and a plurality of third dispersion discs 130 are installed on the first installation part, the second installation part and the third installation part, respectively.

[0077] The center of the disc body of the first dispersion disc 110, the second dispersion disc 120 and the third dispersion disc 130 is provided with a shaft hole and a plurality of medium through holes. The shaft hole is provided with a key groove hole, and the shaft hole can be any one of a polygon, a circle, a square or a triangle. When the shaft hole is a polygon, a square or a triangle, the key groove hole can be omitted. When the shaft hole is a circle, at least one key groove hole is provided, and preferably three key groove holes are provided. The medium through holes can be uniformly distributed or not, and there can be one or more medium through holes. The medium through holes can be any one of a circle, a square, a sector, a polygon, an ellipse or a rounded square. The medium through holes are provided to enable the medium to flow fully in the cylinder body 103, and in combination with the rotation of the dispersion disc, the material grinding is more uniform, and the grinding efficiency is improved.

[0078] It should be noted that the middle shaft 104 is further provided with a shaft sleeve between two adjacent dispersion discs, so that the distance between the dispersion discs is maintained, and the size of the distance is determined by the size of the shaft sleeve, which can protect the middle shaft 104 and reduce the impact of the material on the middle shaft 104.

[0079] In a specific embodiment, for example in grinding silicon carbide, the prepared silicon carbide raw material is slowly fed into the barrel 103 from the raw material feeding end 102, and after the slurry is fully stirred, a small amount of silicon carbide grinding medium is introduced into the grinding assembly 100 for multiple times, and the grinding assembly 100 continues to operate to fully grind the raw material and the grinding medium in the grinding assembly 100. The uppermost end of the middle shaft 104 is provided with a first dispersion disc 110, and a shaft sleeve is further sleeved between each dispersion disc to ensure the distance between each dispersion disc. When the dispersion disc in the barrel 103 rotates at high speed during the operation of the grinding assembly 100, the first dispersion disc 110 provided at the uppermost end is provided with a first flow guide slope 112, and the slope is installed downward, which can give the material a vertical downward and horizontal outward force, so that the material moves downward as a whole. The second dispersion disc 120 provided at the lowermost end of the middle shaft 104 is provided with a second flow guide slope 122, and the slope is installed upward, which can give the material a vertical upward and horizontal outward force, so that the material moves upward as a whole. The material moving downward under the action of the first dispersion disc 110 collides with the material moving upward under the action of the second dispersion disc 120, forming a vortex to promote the large circulation in the barrel 103. Meanwhile, the third dispersion disc 130 is further installed between the first dispersion disc 110 and the second dispersion disc 120, and the material inside the isolation column 132 moves upward and in the direction of the middle shaft 104 under the influence of the isolation column 132 provided on the third dispersion disc 130, and the material is bounced when colliding with the shaft sleeve. The material outside the isolation column 132 moves upward and in the direction of the inner wall of the barrel 103, and the material is bounced when colliding with the inner wall, thereby forming vortexes with different sizes inside and outside. The large silicon carbide particles in the circulation are thrown out by centrifugal force and enter the large circulation or the small circulation for further grinding, while the small silicon carbide particles overflow the barrel 103 through the gap between the middle shaft 104 and the cover plate, enter the discharge bin, flow out from the raw material discharge end 101, and enter the transfer bin 200 through the feeding pipe 201. The silicon carbide that does not meet the process standard continues to circulate in the barrel 103, and under the close cooperation of the small circulation and the large circulation, multiple violent vortexes are formed in the barrel 103, which greatly increases the collision probability between the medium and the raw material, and between the raw materials, thereby making the material grinding more fully and rapidly.

[0080] It should be noted that the installation positions of the first dispersion disc 110, the second dispersion disc 120 and the third dispersion disc 130 can be freely combined according to the type of the grinding assembly 100, the size of the barrel 103, the grinding material and the different needs of the work, and are not limited to the above installation methods.

[0081] Please refer to Figure 2 , 4, 8, 9, in another specific embodiment, the dispersion mechanism is formed by a plurality of fourth dispersion discs 140 connected end to end in sequence, the fourth dispersion disc 140 includes a fourth disc body 141, a variable flow compensation slider 144 and a variable flow driving assembly. The fourth disc body 141 includes an upper disc body 142 and a lower disc body 143, a plurality of sliding grooves are formed on the upper disc body 142 and / or the lower disc body 143 in the radial direction. When the upper disc body 142 and the lower disc body 143 are superimposed, mounting cavities are formed at the sliding grooves. The variable flow compensation slider 144 is slidingly arranged in the mounting cavity, and the end of the variable flow compensation slider 144 can extend out of the edge of the fourth disc body 141. The variable flow driving assembly is connected to the variable flow compensation slider 144 for driving the variable flow compensation slider 144 to reciprocate along the sliding groove.

[0082] Please refer to Figures 8 to 9 In some embodiments, the dispersion mechanism includes a main shaft and a plurality of fourth dispersion discs 140 mounted on the main shaft, the main shaft is connected to a driving motor, and the driving motor drives the fourth dispersion disc 140 to rotate at high speed through the main shaft, realizing the dispersion of the material. In some embodiments, the dispersion mechanism is formed by at least two fourth dispersion discs 140, for example, the upper and lower of the fourth dispersion disc 140 are provided with sub-shafts for connecting to form a main shaft, the sub-shafts of the two fourth dispersion discs 140 can be fixedly connected, for example, the sub-shafts of the two fourth dispersion discs 140 are welded; they can also be detachably connected, for example, the sub-shafts of the two fourth dispersion discs 140 are connected by screw connection, riveting or buckle connection and the like.

[0083] Specifically, the fourth dispersion disc 140 includes an upper disc body 142 and a lower disc body 143 superimposed on each other, at least one of the upper disc body 142 and the lower disc body 143 is provided with a plurality of sliding grooves in the radial direction. The variable flow compensation slider 144 is arranged in the sliding groove and can slide along the sliding groove. The variable flow driving assembly is connected to the variable flow compensation slider 144 for driving the variable flow compensation slider 144 to reciprocate along the sliding groove. For example, the variable flow compensation slider 144 is in the shape of a long strip, and the variable flow driving assembly is a reciprocating motion mechanism arranged on the upper disc body 142 or the lower disc body 143, such as a reciprocating motor.

[0084] As preferred, the variable flow driving assembly comprises a traction shaft 145 and a plurality of traction connecting rods 146, the traction shaft 145 is arranged perpendicularly to the upper disc body 142, one end of the traction connecting rod 146 is hingedly connected to the traction shaft 145, and the other end is hingedly connected to the variable flow compensation slider 144. Specifically, the traction shaft 145 is arranged perpendicularly to the fourth disc body 141 and coaxially to the fourth disc body 141, the upper end or the lower end of the plurality of traction connecting rods 146 is hingedly connected to the traction shaft 145, forming a "umbrella" shape, and the other end of the plurality of traction connecting rods 146 is hingedly connected to the variable flow compensation slider 144. The traction shaft 145 reciprocates up and down perpendicularly to the fourth disc body 141, and through the traction connecting rods 146, pulls the variable flow compensation slider 144 to reciprocate along the sliding groove.

[0085] In some embodiments, the traction shaft 145 can be independently arranged, that is, one reciprocating traction shaft 145 is arranged in each fourth dispersion disc 140. In a preferred embodiment, a first outer shaft 147 is connected to the upper disc body 142, and a second outer shaft 148 is connected to the lower disc body 143, the first outer shaft 147 and the second outer shaft 148 are hollow to form a traction cavity 152, and the traction shaft 145 is arranged in the traction cavity 152. At this time, a plurality of traction shafts 145 pass through the traction cavity 152 and are fixedly or detachably connected to form a complete traction shaft 145. At this time, only the mechanism for driving the traction shaft 145 to reciprocate up and down, such as a reciprocating motor, a reciprocating gear structure, etc., needs to be connected to the upper end or the lower end of the complete traction shaft 145, so that the entire traction shaft 145 can reciprocate up and down, and at the same time drive a plurality of traction connecting rods 146 to drive the variable flow compensation slider 144 to reciprocate along the sliding groove.

[0086] On the one hand, the variable flow compensation slider 144 is arranged, and the end of the variable flow compensation slider 144 can extend beyond the outer edge of the upper disc body 142, so that during the rotation of the upper disc body 142, the part of the variable flow compensation slider 144 extending beyond the edge of the upper disc body 142 collides with the grinding medium and the material, thereby increasing the shear force between the fourth disc body 141 and the ground material, and improving the grinding efficiency. On the other hand, the variable flow compensation slider 144 is arranged and reciprocates along the radial direction of the upper disc body 142 under the action of the variable flow driving assembly, thereby actively changing the turbulent state of the grinding medium and the material near the edge of the upper disc body 142, significantly increasing the collision probability between the grinding medium and the material, and further significantly improving the grinding efficiency. Compared with the grinding assembly 100 with a fixed structure of the fourth dispersion disc 140, the double variable flow grinding assembly 100 provided by the present application improves the grinding efficiency of silicon carbide by 20% to 40%.

[0087] In some preferred embodiments, the upper disc body 142 and / or the lower disc body 143 is provided with a clearance cavity 151, and the traction connecting rod 146 is arranged in the clearance cavity 151. That is, in order to adapt to the movement track of the traction connecting rod 146 and ensure that the traction connecting rod 146 is located in a relatively closed environment to prevent the connection of the traction connecting rod 146 from being jammed, at least one of the upper disc body 142 and the lower disc body 143 is provided with a clearance cavity 151 capable of not affecting the movement of the traction connecting rod 146, for example, the clearance cavity 151 is conical or square. The position of the clearance cavity 151 forms a space for the movement of the traction connecting rod 146. Only the connection between the upper disc body 142 and the lower disc body 143 needs to be disassembled, and the maintenance and replacement of the variable flow compensation slider 144 and the traction connecting rod 146 can be realized, which is convenient to operate.

[0088] In some embodiments, the end of the variable flow compensation slider 144 is provided with a wear-resistant part to slow down the wear rate of the variable flow compensation slider 144 and further reduce the production cost.

[0089] In yet some embodiments, the number of the variable flow compensation sliders 144 is 3 to 12.

[0090] According to a specific embodiment, the upper part of the barrel 103 is provided with a raw material discharge end 101 and a grinding medium feeding port, and the lower part of the barrel 103 is provided with a raw material feeding end 102. Arranging the raw material feeding end 102 at the lower end of the barrel 103 can make the material slowly enter from the bottom. If the feeding end 102 is arranged above the barrel 103, the material will be affected by gravity when entering the barrel 103, which will cause impact on the shaft or the dispersion disc in the barrel 103. Long-term impact will damage the shaft and the dispersion disc or make the dispersion disc skew after being impacted, which will disturb the vortex flow in the barrel 103, thereby breaking the circulation system in the barrel 103 and causing the grinding quality to decrease. The ground slurry will flow out from the raw material discharge end 101 above the barrel 103 according to the circulation system, and the raw material discharge end 101 is also provided with a filter screen, which further ensures the quality of the material. The grinding medium feeding port is arranged above the barrel 103, and the feeding will not affect the central shaft 104 or the dispersion disc, because firstly, the amount of added grinding medium is less than that of the raw material, and the grinding medium is added in small amounts and multiple times; secondly, the raw material is added first, and the grinding medium is added after a period of operation, so the grinding medium feeding port can be placed above the barrel 103.

[0091] According to a specific embodiment, the outer part of the barrel 103 is provided with a cooling device, and the cooling device is provided with a cooling medium inlet and a cooling medium outlet. Since the slurry in the barrel 103 runs at a high speed, a certain amount of heat will be generated. In order to ensure the normal temperature in the barrel, the outer part of the barrel 103 is provided with a cooling device, and the cooling device is provided with a cooling medium inlet and a cooling medium outlet, so that the cooling medium can be circulated continuously, thereby ensuring the process temperature of the barrel 103.

[0092] According to a specific embodiment, the upper end of the barrel 103 is further provided with a cover plate, and the cover plate is provided with a plurality of mounting holes. The cover plate can prevent the material from splashing out, and can also facilitate observation and maintenance.

[0093] Please refer to Figure 11 、 Figure 12 In a specific embodiment, the settling assembly 300 includes a settling bucket 305, and the settling bucket 305 is provided with at least one classification screen 310. The classification screen 310 is arranged obliquely and has intersecting third and fourth flow guide slopes 311 and 312. The third and fourth flow guide slopes 311 and 312 intersect to form a flow guide groove 313. The settling bucket 305 is provided with a return port 304, and the return port 304 is connected to the feed pipe 201. The bottom end of the flow guide groove 313 is opposite to the return port 304. The silicon carbide slurry is settled in the settling assembly 300 for a predetermined time. The silicon carbide with a larger particle size (i.e., the recovered material, with a particle size of 50 um to 70 um) is settled at the bottom of the settling assembly 300. The silicon carbide with a larger particle size (i.e., the recovered material) is introduced into the transition bucket 306 and then enters the transfer bin 200 through the return pipe 302. The process particle size in the settling bucket 305 is extracted from the sampling outlet 303 through the transition bucket 306. The large-particle silicon carbide (i.e., the recovered material, with a particle size greater than 200 um) intercepted by the classification screen 310 is introduced into the transfer bin 200 through the return port 304 and the feed pipe 201, and then enters the next round of self-milling cycle of the slurry.

[0094] It should be noted that, for example, in the preparation of slurry, because of the sub-micron powder has a large specific surface area and surface energy, it is very easy to produce agglomeration, powder flow performance and dispersion performance is poor, in order to effectively avoid the re agglomeration of each component, through the experiment in the slurry into the barrel before the general will first slurry pH value to 10, at this time the slurry not only maintains the original uniformity of the slurry, and the particle size in the process of sedimentation is normal distribution, good flowability, suitable for continuous automatic forming, also can improve the uniformity of green body, is beneficial to the sintering of ceramic. Slurry from the feed inlet above the settling tank 305 into the settling tank 305, when the slurry fills the whole barrel (can't exceed the upper limit of water level), sedimentation, sedimentation time is determined by process and powder (1 hour to 200 hours), due to the characteristics of silicon carbide powder, silicon carbide particles with large particle size will be settled first, in order to intercept large particle silicon carbide (i.e. recycled material), obtain more uniform silicon carbide particles, the classification screen 310 is arranged in the settling tank 305, here we prefer to two screen, in order to prevent the micro powder particles from blocking the screen hole, the screen is arranged to be inclined downward relative to the horizontal plane, when the slurry is stacked at the lower end of the first layer of slope, the slurry can continue to flow out from the upper end of the screen hole and enter the second layer of slope, the second layer of slope is arranged because the silicon carbide powder is irregular in shape, one is arranged to filter a small part of large particle silicon carbide powder, two is that the micro powder can be filtered and classified according to the need, the filter is smaller than the first layer of slope, the classification screen 310 is designed to be inclined, which not only increases the filtering area, but also improves the filtering efficiency.

[0095] When the sedimentation is completed, the slurry meeting the working standard is discharged from the settling tank 305, and the large particle micro powder is left on the classification screen 310. At this time, the return port 304 corresponding to the classification screen 310 is opened. Because the inclination angle of the classification screen 310 is set according to the angle of repose of the micro powder slurry, the large particle micro powder naturally enters the transfer bin 200 through the feed pipe 201 from the return port 304.

[0096] Please refer to Figure 12 In order to prevent the micro powder slurry from blocking and to better discharge the settling tank 305, the classification screen 310 comprises a third guide slope 311 and a fourth guide slope 312, the third guide slope 311 and the fourth guide slope 312 are spliced to form a guide groove 313, and the guide groove 313 is in streamline shape, so that the powder slurry is more likely to slide down.

[0097] Preferably, the classification screen 310 has a mesh size of 400 to 1200 mesh, and in actual work, the mesh size of the classification screen 310 can be freely configured according to actual work needs, and the screen can be configured to have the same mesh size, or different mesh sizes can be configured according to needs; generally, the mesh size of the upper screen is smaller, and the screen hole is larger, and the smaller the mesh size, the finer the screen hole; the main function of the classification screen 310 with different mesh sizes is to remove particles larger than a certain value inside the slurry (since the particles of silicon carbide are irregular in shape during screening, the screen cannot completely remove particles of the corresponding size).

[0098] Preferably, the lower part of the settling tank 305 is provided with a conical first pouring cone, and the upper part of the settling tank 305 is preferably cylindrical, and the angle of the pouring cone is set according to the repose angle or angle of repose of different powders; such a setting can reduce friction and increase flowability, so that the slurry can naturally slide down.

[0099] In actual work, by accurately controlling the settling time, part of the large particle slurry settles on the classification screen 310, and another part of the large particles settles in the lower part of the settling tank 305, and the intermediate slurry is the silicon carbide slurry required in actual work, that is, the process material; at this time, the isolation valve is opened, the larger particle slurry (i.e. the recycled material) is poured into the transition tank 306 through the guide pipe, and when the larger particle slurry completely flows into the transition tank 306, the isolation valve is closed, and the larger particle slurry in the transition tank 306 is completely introduced into the transfer bin 200 through the return pipe 302. In order to prevent the large particles in the transition tank 306 from being left, the lower part of the transition tank 306 is provided with a conical second pouring cone, so that the large particles in the transition tank 306 can be completely discharged; at this time, the isolation valve is opened again, and the obtained process material flows out of the transition tank 306 and enters the next process.

[0100] Preferably, the settling tank 305 is provided with a high-pressure cleaning pipe, and a plurality of nozzles are installed on the high-pressure cleaning pipe; the nozzles can be freely rotated, or the nozzle spray route can be set according to needs; the high-pressure cleaning system is composed of the high-pressure cleaning pipe surrounding the tank wall of the settling tank 305, a plurality of high-pressure nozzles installed on the high-pressure cleaning pipe, and a high-pressure nozzle inserted into the liquid level meter; since the silicon carbide slurry has thixotropy and is easy to adhere to the pipe wall or cylinder wall, the high-pressure cleaning system can be used to automatically clean the residual slurry on the conical tank, the classification screen 310 and the liquid level meter after the settling is completed, thereby avoiding manual cleaning.

[0101] Preferably, the settling tank 305 is provided with a liquid level meter, which mainly displays the real-time position of the slurry; however, due to the long-term sedimentation of the slurry, silicon carbide powder is easy to accumulate at the bottom of the liquid level meter, and the adhesion increases, so it is not easy to clean; therefore, an ultrasonic vibration device is provided near the bottom of the pipeline to prevent the slurry from being blocked.

[0102] It should be noted that, first, the silicon carbide slurry may have insufficient power during flow, therefore, the grinding system further comprises a feeding assembly, the feeding assembly comprises a first feeding pump 401 and a second feeding pump 402, the feeding end 102 is connected with the discharge pipe 202 through the first feeding pump 401, and the feeding pipe 201 is connected with the return pipe 302 through the second feeding pump 402. For example, without the power of the feeding assembly, the grinding cycle of the grinding assembly 100 and the transfer bin 200 is slow by relying on the pressure in the chamber for feeding, therefore, the feeding end 102 is connected with the discharge pipe 202 through the first feeding pump 401 for increasing power, and the feeding pipe 201 is connected with the return pipe 302 through the second feeding pump 402, second, the large particle silicon carbide and the relatively large particle silicon carbide in the application need to be introduced into the transfer bin 200 for further grinding, and are therefore collectively referred to as recycled materials.

[0103] The application further discloses a production method of the silicon carbide micro powder, which is applied to any one of the silicon carbide grinding systems and comprises the following steps.

[0104] S1. The silicon carbide slurry is prepared in the transfer bin 200, and the solid content of the silicon carbide slurry is detected until the solid content of the silicon carbide slurry reaches a preset value; wherein the method for preparing the silicon carbide slurry in the transfer bin 200 is that the silicon carbide raw material and water are mixed in the transfer bin 200, a pH regulator is added, the pH regulator is at least one of NaOH, KOH and sodium alcoholate, the pH value is adjusted to 9-12, the alkaline silicon carbide slurry is prepared, a dispersing agent is added in the transfer bin 200, the dispersing agent is TMAH, and the alkaline silicon carbide slurry is mixed and stirred to obtain the silicon carbide slurry, and the solid content of the silicon carbide slurry is preferably 10%-40%, too low solid content is easy to cause waste, and too high solid content affects the flowability of the slurry.

[0105] S2. The silicon carbide slurry in the transfer bin 200 is slowly injected into the grinding assembly 100 through the discharge pipe 202; wherein, because the grinding assembly 100 is always in operation when the slurry is injected into the grinding assembly 100, the slurry is easy to impact the dispersion disc in the grinding assembly 100 if the injection is too fast, which may cause the dispersion disc to be skewed and affect the grinding efficiency.

[0106] S3. Adding grinding medium in the grinding assembly 100, the grinding medium is silicon carbide particles, and the particle size of the silicon carbide particles is 1 mm to 10 mm; wherein the raw material and the grinding medium in the grinding assembly 100 are both silicon carbide, and the self-grinding can reduce the introduction of impurities, and due to the limitation of the capacity of the grinding assembly 100, a small amount of silicon carbide grinding medium needs to be added multiple times to avoid affecting the grinding efficiency due to excessive or insufficient addition.

[0107] S4. Grinding the silicon carbide slurry in the grinding assembly 100, and the ground silicon carbide slurry overflows from the discharge end 101 of the grinding assembly 100 and enters the transfer bin 200 through the feeding pipe 201, and continuously circulates until at least 90% of the silicon carbide slurry in the transfer bin 200 is ground to the process particle size.

[0108] S5. The silicon carbide slurry in the transfer bin 200 is introduced into the settling assembly 300 for settling; wherein when all the silicon carbide slurry is ground, some of the silicon carbide slurry has not reached the process particle size, which will affect the quality of the downstream process, therefore, further settling is needed to obtain high-quality silicon carbide slurry.

[0109] S6. After settling for a predetermined time, the ground silicon carbide slurry is settled and stratified in the settling assembly 300, the bottom layer is the recovered material, and the upper layer is the process material, the recovered material enters the transfer bin 200 through the recovered material pipe 302, and the process material is extracted through the extraction outlet 303; wherein the process material is extracted from the extraction outlet 303, the recovered material is introduced into the transfer bin 200 and enters a new round of grinding cycle, and thus circulates, and finally all the silicon carbide slurry extracted is process material, thereby reducing the waste of silicon carbide.

[0110] In specific embodiments, the production method of silicon carbide fine powder comprises the following steps:

[0111] The silicon carbide raw material and water are added to the transfer bin 200 for mixing, the silicon carbide raw material is 800 mesh to 2000 mesh silicon carbide, preferably D 50 The particle size is 6.7 um to 14 um, a pH adjuster is added, the pH adjuster is at least one of NaOH, KOH, and sodium alcoholate, the pH value is adjusted to 9 to 12, an alkaline silicon carbide slurry is prepared, a dispersing agent is added in the transfer bin 200, the dispersing agent is TMAH, and the alkaline silicon carbide slurry is mixed and stirred to obtain the silicon carbide slurry, and the solid content of the silicon carbide slurry is detected to be 10% to 40%.

[0112] The silicon carbide slurry in the transfer bin 200 is slowly injected into the grinding assembly 100 through the discharge pipe 202, and after a predetermined amount is injected, a small amount of grinding medium, which is silicon carbide particles with a particle size of 1 mm to 10 mm, is added multiple times in the grinding assembly 100. The ground silicon carbide slurry overflows from the discharge end 101 of the grinding assembly 100 and enters the transfer bin 200 through the feed pipe 201, and this cycle continues until the particle size of the silicon carbide particles at the bottom of the grinding assembly 100 reaches 0.5 um to 0.7 um.

[0113] After the silicon carbide slurry is ground by the above-mentioned grinding assembly 100, most of the silicon carbide particles have been ground to the process particle size, but there are still a small amount of silicon carbide particles that do not meet the process standards, so further sedimentation is required to intercept the silicon carbide slurry that does not meet the process.

[0114] The silicon carbide slurry in the transfer bin 200 is introduced into the sedimentation assembly 300 for sedimentation, and after a predetermined time of sedimentation, the ground silicon carbide slurry is sedimented and stratified in the sedimentation assembly 300, with the recovered material at the bottom and the process material at the top. The recovered material is introduced into the transfer bin 200 through the return pipe 302 and enters the next round of self-grinding cycle of the slurry, and the process material is extracted from the extraction outlet 303 of the sedimentation assembly 300.

[0115] It should be noted that the particle size of silicon carbide is measured by BT to 9300ST Dandong Bitai laser particle size analyzer.

[0116] Experimental Example

[0117] 800 kg of silicon carbide raw material and deionized water were added to the transfer bin 200 in a mass ratio of 1:4, stirred for 0.5 hours, and a pH adjuster was added. The pH adjuster is a mixture of NaOH and KOH, and the mass ratio of NaOH to KOH in the mixture is 1:1. The pH value of the silicon carbide slurry is adjusted to 10, and stirred for 1 hour. Then a dispersing agent TMAH is added, and the addition amount ratio of NaOH, KOH and TMAH is 1:1:2, to prepare a silicon carbide slurry.

[0118] The silicon carbide slurry is introduced into the grinding assembly 100 at a rotational speed of 800 revolutions per minute (r / min), and after 12 hours of grinding, a small amount of silicon carbide grinding medium with a particle size of 6 mm is added multiple times. During the grinding process, the ground silicon carbide particles overflow from the grinding assembly 100, fall into the intermediate bin 200 through the feed pipe 201, and the slurry in the intermediate bin 200 is supplemented into the grinding assembly 100 through the discharge pipe 202, and the cycle is repeated. The particle size at the bottom of the grinding assembly 100 is detected every 12 hours, and when the particle size at the bottom of the grinding assembly 100 is less than 1 mm to 3 mm, the grinding medium is supplemented and added. Until the particle size of the silicon carbide powder reaches 0.5 um to 0.7 um.

[0119] The ground silicon carbide slurry is poured from the intermediate bin 200 into the settling assembly 300 through the discharge pipe 202, and after 48 hours of settling, the larger particle size silicon carbide (i.e. recycled material with a particle size greater than 50 um) settles at the bottom of the settling assembly 300. The silicon carbide slurry at the bottom that does not meet the process particle size (i.e. recycled material) is introduced into the intermediate bin 200 through the return pipe 302 and enters the next round of self-grinding cycle of the slurry. The remaining silicon carbide slurry that meets the process particle size (i.e. process material) is extracted through the extraction outlet 303.

[0120] The above-described embodiments only express the device layout of the present application, which is described in detail and specifically, but should not be construed as limiting the scope of the patent application; it should be noted that for ordinary skilled persons in the art, several adjustments and improvements can be made without departing from the concept of the present application, which are within the scope of the present application; therefore, the scope of protection of the present patent application should be subject to the appended claims.

Claims

1. A silicon carbide lapping system, comprising: Comprising The transfer warehouse is provided with a feeding pipe and a discharging pipe, and is used for adjusting silicon carbide slurry; The grinding assembly comprises a barrel and a dispersion mechanism arranged in the barrel, the barrel is provided with a feeding end and a discharging end, the discharging end is connected with the feeding pipe, and the feeding end is connected with the discharging pipe; The settling assembly is provided with a feeding inlet, the feeding inlet is connected with the discharging pipe, the bottom of the settling assembly is provided with a return pipe, the return pipe is connected with the feeding pipe, and the return pipe is provided with a sampling outlet, and the bottom of the settling assembly and the return pipe are provided with a transition barrel; and The silicon carbide slurry after grinding is settled and layered in the settling assembly, the bottom layer is recycled material, and the upper layer is process material, the recycled material enters the transfer warehouse through the return pipe, and the process material is sampled through the sampling outlet; The dispersion mechanism comprises a middle shaft, at least two first dispersion discs are mounted on the upper part of the middle shaft, and a first mounting part is formed between adjacent two first dispersion discs; at least two second dispersion discs are mounted on the lower part of the middle shaft, a second mounting part is formed between adjacent two second dispersion discs, and a third mounting part is formed between adjacent first dispersion discs and second dispersion discs; and a plurality of third dispersion discs are mounted in the first mounting part, the second mounting part and the third mounting part; The first dispersion disc comprises a first disc body, a plurality of first dispersion components are uniformly arranged along the circumferential direction of the edge of the first disc body, the first dispersion component has at least one first flow guide slope, and when medium collides with the first flow guide slope, the medium can receive a vertical downward and horizontal outward component force along the first flow guide slope; The second dispersion disc comprises a second disc body, the second disc body is conical, a plurality of second dispersion components are arranged on the slope of the conical shape in a circumferential direction interval, and the second dispersion component has at least one second flow guide slope, and when medium collides with the second flow guide slope, the medium can receive a vertical upward and horizontal outward component force along the second flow guide slope; The third dispersion disc comprises a third disc body, a plurality of isolation columns are arranged on the third disc body, the isolation columns are arranged on the same circumference, and under high-speed rotation, the grinding liquid forms a double-channel isolation film on both sides of the third dispersion disc; The settling assembly comprises a settling barrel, at least one grading screen is arranged in the settling barrel, the grading screen is arranged obliquely, has intersecting third flow guide slopes and fourth flow guide slopes, a flow guide groove is formed at the intersection of the third flow guide slope and the fourth flow guide slope, and the settling barrel is provided with a return port, the return port is connected with the feeding pipe, and the bottom end of the flow guide groove is opposite to the return port.

2. The silicon carbide lapping system of claim 1, wherein, The feeding assembly comprises a first feeding pump and a second feeding pump, the feeding end and the discharging pipe are connected through the first feeding pump, and the feeding pipe and the return pipe are connected through the second feeding pump.

3. A method for producing silicon carbide micropowder, characterized by, The production method is applied to the silicon carbide grinding system in any one of claims 1 to 2, and comprises the following steps: S1. Preparing silicon carbide slurry in the transfer bin and detecting the solid content of the silicon carbide slurry until the solid content of the silicon carbide slurry reaches a preset value; S2. Slowly injecting the silicon carbide slurry in the transfer bin into the grinding assembly through the discharge pipe; S3. Adding grinding medium in the grinding assembly, the grinding medium is silicon carbide particles, and the particle size of the silicon carbide particles is 1 mm to 10 mm; S4. Grinding the silicon carbide slurry in the grinding assembly, and the ground silicon carbide slurry overflows from the discharge end of the grinding assembly and enters the transfer bin through the feeding pipe, continuously circulating until at least 90% of the silicon carbide slurry in the transfer bin is ground to process particle size; S5. Introducing the silicon carbide slurry in the transfer bin into the settling assembly for settling; S6. After settling for a preset time, the ground silicon carbide slurry is settled and stratified in the settling assembly, the bottom layer is recycled material, and the upper layer is process material, the recycled material enters the transfer bin through the recycled material pipe, and the process material is extracted through the extraction outlet.

4. The method of producing silicon carbide fine powder according to claim 3, characterized by, In the S1 step, the preset value is 10% to 40%.

5. The method of producing silicon carbide fine powder according to claim 3, characterized by, In the S1 step, the preparation of the silicon carbide slurry in the transfer bin includes the following steps: A1. Mixing silicon carbide raw materials and water in the transfer bin, adding a pH adjuster to adjust the pH value to 9 to 12 to obtain an alkaline silicon carbide slurry; A2. Adding a dispersing agent in the transfer bin, mixing and stirring with the alkaline silicon carbide slurry to obtain the silicon carbide slurry.

6. The method of producing silicon carbide fine powder according to claim 5, characterized by, In the A1 step, the pH adjuster is at least one of NaOH, KOH, and sodium alkoxide.

7. The method of producing silicon carbide fine powder according to claim 5, characterized by, In the A2 step, the dispersing agent is TMAH.

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