Anti-agglomeration treatment device for silicon carbide micro powder

Abstract

The silicon carbide micro-powder anti-agglomeration treatment device comprises a tower body, a stirring cavity, an isolation bin and a spray drying cavity, the stirring cavity, the isolation bin and the spray drying cavity are sequentially arranged in the axis direction of the tower body, and the stirring cavity communicates with the spray drying cavity through a flow guide cavity penetrating through the isolation bin; the stirring device is arranged in the stirring cavity and comprises a driving motor arranged at the top of the tower; the rotating shaft is connected with a driving motor through a coupler, penetrates through the stirring cavity and the flow guide cavity and extends to the spray drying cavity; the stirring assembly is connected with the rotating shaft; the centrifugal spraying device is connected with the end of the rotating shaft. The stirring device and the spray drying tower are integrated, the rotating shaft is driven by the driving motor to rotate, the part, in the stirring cavity, of the rotating shaft is provided with the stirring blades, the part, extending into the spray drying cavity, of the rotating shaft is provided with the centrifugal spraying device, the rotating shaft is driven by the driving motor to rotate, and stirring and centrifugal spraying can be achieved at the same time; the problem that high-solid-content slurry is difficult to convey in the prior art is solved.

Description

Technical Field

[0001] The present application belongs to the technical field of preparing silicon carbide particle materials, and relates to a silicon carbide micropowder anti-agglomeration treatment device. Background Art

[0002] In the field of silicon carbide ceramic material preparation, the existing dry molding process usually uses high-purity silicon carbide micropowder and sintering aid premixing and then spray drying granulation to solve the agglomeration problem of nano-scale silicon carbide particles caused by van der Waals forces and electrostatic effects. This process requires the powder raw material and organic solvent to be prepared into a mixed slurry, which is then transported to a spray drying tower for granulation after high-speed stirring to form a uniform dispersion system.

[0003] However, in actual industrial applications, since the solid content of the slurry system needs to be controlled at 45-55wt% to ensure the granulation efficiency, the mixed slurry exhibits significant pseudoplastic fluid characteristics (apparent viscosity> 800mPa·s), and it is very easy to produce wall deposition in the screw pump-pipeline transportation system, resulting in a reduction rate of more than 30% in the effective diameter of the transportation pipeline. In addition, when the production system is suspended due to equipment maintenance or process adjustment, the residual high-viscosity slurry will form solidified lumps at the elbow of the delivery pipe, and production can only be resumed through a composite cleaning process of acid washing + high-pressure water washing. A single cleaning takes more than 4 hours and is accompanied by 3-5% raw material loss, which seriously restricts continuous production efficiency and equipment utilization. Summary of the invention

[0004] The purpose of the present invention is to solve the problem in the prior art that high-solid content slurry formed by premixing silicon carbide micropowder and sintering aid is difficult to transport.

[0005] In order to achieve the above-mentioned purpose, the present application proposes a silicon carbide micropowder anti-agglomeration treatment device, comprising: A tower body, the tower body comprising: a stirring chamber, an isolation chamber and a spray drying chamber arranged in sequence along the axial direction of the tower body, the stirring chamber and the spray drying chamber being connected via a guide chamber penetrating the isolation chamber; A stirring device is arranged in the stirring chamber, and the stirring device comprises: a driving motor arranged on the top of the tower body; a rotating shaft connected to the driving motor through a coupling and passing through the stirring chamber and the guide chamber and extending to the spray drying chamber; a stirring assembly arranged in the stirring chamber and connected to the rotating shaft; A centrifugal spray device is connected to the end of the rotating shaft.

[0006] In the prior art, silicon carbide micropowder and sintering aid need to be premixed first, and then the mixed slurry is transported to the spray drying tower through a pipeline conveying system. The slurry hanging on the wall of the pipeline often dries and causes pipeline blockage, forcing the production line to be shut down for desilting, which seriously affects the continuous production efficiency.

[0007] The present application integrates a stirring device with a spray drying tower, and drives a rotating shaft to rotate through a driving motor. The portion of the rotating shaft in the stirring chamber is provided with stirring blades, and the portion of the rotating shaft extending into the spray drying chamber is provided with a centrifugal spray device. By driving the rotating shaft to rotate through a driving motor, stirring and centrifugal spraying can be achieved simultaneously, thereby solving the problem in the prior art that high-solid content slurry formed after premixing silicon carbide micropowder and sintering aid is difficult to transport.

[0008] Furthermore, in order to reduce the wall deposition of the mixed slurry at the bottom of the stirring chamber, the bottom of the stirring chamber is configured as a conical closing structure, and the guide chamber is connected to the lowest point of the conical closing structure.

[0009] Furthermore, in order to reduce the adhesion of dried silicon carbide to the bottom of the spray drying chamber, the bottom of the spray drying chamber is configured as a conical closing structure, and a hot air blower is symmetrically arranged on the outer wall of the shell of the conical closing structure of the spray drying chamber.

[0010] Furthermore, in order to realize the collection of gas and solid after spray drying, it also includes: a product recovery unit connected to the bottom of the spray drying chamber; the product recovery unit includes: a discharge pipe connected to the bottom of the spray drying chamber through a flange; and a cyclone separator connected to the end of the discharge pipe.

[0011] Furthermore, in order to utilize the exhaust gas output by the cyclone separator to generate bubbles at the bottom of the stirring chamber and improve the uniformity of material mixing, a communicating pipe is provided between the air outlet of the cyclone separator and the stirring chamber.

[0012] Furthermore, in order to construct a communicating vessel to prevent the liquid in the stirring chamber from flowing into the cyclone separator along the pipeline, the communicating vessel pipe includes: a first conduit extending upward along the axial direction of the tower body to be flush with the top surface of the tower body; a second conduit connected to the output end of the first conduit and extending downward; and a third conduit connected to the output end of the second conduit and bent upward to pass through the bottom of the stirring chamber.

[0013] Furthermore, in order to facilitate the discharge of exhaust gas, an air outlet is provided at the top of the tower body.

[0014] Furthermore, in order to observe the conditions inside the tower body, an observation window is provided on the tower body.

[0015] The beneficial effects of this application are: 1. The present application integrates a stirring device with a spray drying tower, and drives a rotating shaft to rotate through a driving motor. The portion of the rotating shaft in the stirring chamber is provided with stirring blades, and the portion of the rotating shaft extending into the spray drying chamber is provided with a centrifugal spray device. By driving the rotating shaft to rotate through a driving motor, stirring and centrifugal spraying can be achieved simultaneously, thereby solving the problem in the prior art that high-solid content slurry formed after premixing silicon carbide micropowder and sintering aid is difficult to transport.

[0016] 2. The bottom of the stirring chamber of the present application is set as a conical structure. The tapered channel formed by the conical structure can increase the flow rate of the slurry. By reducing the contact area with the flat bottom, the wall adhesion of the high-viscosity slurry is reduced, and the deposition amount of silicon carbide micropowder during the separation process can be reduced. At the same time, the slurry can be completely emptied under the action of gravity, completing the self-cleaning of the bottom of the stirring chamber.

[0017] 3. The bottom of the spray drying chamber of the present application is set as a conical structure to reduce the wall adhesion of the material after drying. At the same time, the hot air blower symmetrically set on the conical side wall can blow away the dried material to further prevent the material from agglomerating.

[0018] 4. The present application introduces the exhaust gas output by the cyclone separator into the bottom of the stirring chamber, improves the uniformity of material mixing by blowing bubbles into the stirring chamber, and at the same time provides a connecting pipe to prevent the mixed slurry in the stirring chamber from flowing into the cyclone separator and causing damage to the cyclone separator. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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 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.

[0020] Figure 1 This is a schematic structural diagram of a silicon carbide powder anti-agglomeration treatment device in an embodiment of the present application; Figure 2 It is a cross-sectional view of a silicon carbide powder anti-agglomeration treatment device in an embodiment of the present application.

[0021] Description of reference numerals: 1. Tower body; 11. Stirring chamber; 12. Isolation chamber; 13. Spray drying chamber; 131. Cyclone separator; 14. Diversion chamber; 2. stirring device; 21. driving motor; 22. rotating shaft; 23. stirring assembly; 3. Centrifugal spray device; 4. Product recovery unit; 41. Discharge pipe; 5. Connecting tube; 51. First conduit; 52. Second conduit; 53. Third conduit; 6. Hot air blower; 7. Exhaust port; 8. Observation window. DETAILED DESCRIPTION

[0022] The following will be combined with the attached Figure 1~2 The embodiments of the technical solution of the present application are described in detail. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0023] like Figure 1~2 The present invention illustrates a silicon carbide micropowder anti-agglomeration treatment device. In order to integrate the stirring and spray drying functions and solve the problem of high-solid content slurry transportation, the present device integrates the stirring device and the spray drying tower. The tower body 1 is provided with a stirring chamber 11, an isolation chamber 12 and a spray drying chamber 13 in sequence along the axial direction. The stirring chamber 11 and the spray drying chamber 13 are connected through a guide chamber 14 that penetrates the isolation chamber 12. The stirring device 2 includes a driving motor 21 arranged at the top of the tower body 1, a rotating shaft 22 that penetrates the stirring chamber 11 and the guide chamber 14 and extends to the spray drying chamber 13, and a stirring assembly 23 arranged in the stirring chamber 11. The end of the rotating shaft 22 is connected to the centrifugal spray device 3.

[0024] During operation, the drive motor 21 drives the rotating shaft 22 to rotate, and the stirring assembly 23 stirs the mixed slurry of silicon carbide micropowder and sintering aid in the stirring chamber 11 at high speed to form a uniform dispersion system. At the same time, the rotating shaft 22 transports the stirred slurry to the spray drying chamber 13 through the guide chamber 14, and the centrifugal spray device 3 atomizes the slurry into tiny droplets under high-speed rotation, without the need for a traditional screw pump-pipeline transportation system, completely avoiding the wall deposition and solidification agglomeration problems of high-solid content slurry during transportation, ensuring continuous and efficient production.

[0025] At the same time, the conical closing structure at the bottom of the stirring chamber can achieve self-cleaning and reduce deposition. Figure 2 In the cross-sectional view in FIG, the bottom of the stirring chamber 11 is set as a conical closing structure, and the guide chamber 14 is connected to the lowest point of the conical closing structure. The conical structure forms a tapered channel. Under the action of gravity, the flow speed of the slurry is accelerated, the contact area with the flat bottom is reduced, and the wall adhesion of the high-viscosity slurry is effectively reduced. At the same time, the tapered channel makes the slurry tend to flow downward during the stirring process, reducing the amount of silicon carbide powder deposited during the separation process. When the stirring is completed, the slurry can be completely emptied from the lowest point of the conical closing structure through the guide chamber 14 under the action of gravity, realizing self-cleaning of the bottom of the stirring chamber and avoiding clogging by residual slurry drying.

[0026] In order to make the conical closing of the bottom of the spray drying chamber work together with the hot air blower to further prevent the material from agglomerating, the bottom of the spray drying chamber 13 is also set to a conical closing structure to reduce the wall hanging of silicon carbide micropowder at the bottom of the chamber after drying. The hot air blower 6 is symmetrically arranged on the outer wall of the shell of the conical closing structure. The hot air blower 6 blows hot air into the spray drying chamber 13. On the one hand, it accelerates the drying process of the droplets. On the other hand, the hot air forms an air vortex in the conical closing structure to blow away the dry material attached to the wall surface, further preventing the material from agglomerating due to electrostatic effects or van der Waals forces, and ensuring that the silicon carbide micropowder particles after drying are evenly dispersed.

[0027] In one embodiment of the present application, efficient gas-solid separation is achieved through the quota of the product recovery unit and the cyclone separator. Specifically, the bottom of the spray drying chamber 13 is connected to the product recovery unit 4, and the product recovery unit 4 includes a discharge pipe 41 connected to the bottom of the spray drying chamber 13 through a flange, and a cyclone separator 132 connected to the end of the discharge pipe 41. The dried silicon carbide micropowder particles fall into the discharge pipe 41 under the action of gravity and enter the cyclone separator 132. The cyclone separator 132 uses centrifugal force to separate the particles from the airflow to achieve efficient gas-solid separation. The separated particles are discharged from the bottom of the cyclone separator 132 and collected as the final product; the separated gas is discharged through the air outlet of the cyclone separator 132 and enters the subsequent processing flow.

[0028] Example 2 Please refer to Figure 1 and Figure 2 In order to introduce exhaust gas through the communicating tube and improve the uniformity of material mixing, a communicating tube 5 is provided between the air outlet of the cyclone separator 132 and the stirring chamber 11. The communicating tube 5 includes a first conduit 51 extending upward along the axial direction of the tower body 1 to be flush with the top surface of the tower body 1, a second conduit 52 connected to the output end of the first conduit 51 and extending downward, and a third conduit 53 connected to the output end of the second conduit 52 and bent upward to pass through the bottom of the stirring chamber 11. The exhaust gas discharged from the cyclone separator 132 is introduced into the bottom of the stirring chamber 11 through the communicating tube 5. The exhaust gas rises from the bottom of the stirring chamber 11 in the form of bubbles. Under the stirring action of the stirring assembly 23, the bubbles are fully in contact with the slurry to improve the uniformity of material mixing. At the same time, the special structural design of the communicating tube 5, that is, the first conduit 51 extends upward to be flush with the top surface of the tower body 1, the second conduit 52 extends downward, and the third conduit 53 bends upward and passes through the bottom of the stirring chamber 11, forming a "U"-shaped structure, which effectively prevents the mixed slurry in the stirring chamber 11 from flowing into the cyclone separator 132 along the pipeline and causing damage to the cyclone separator 132.

[0029] Furthermore, the air outlet and observation window at the top of the tower body optimize waste gas emission and equipment monitoring. The top of the tower body 1 is provided with an air outlet 7, which is convenient for centrally discharging the waste gas generated in the stirring chamber 11 and the spray drying chamber 13, ensuring the stability of the internal pressure of the equipment and improving the safety of equipment operation. The tower body 1 is also provided with an observation window 8, through which the operator can observe the operation of the stirring chamber 11 and the spray drying chamber 13 inside the tower body 1 in real time, and promptly discover equipment failures or process abnormalities, providing an intuitive basis for equipment maintenance and process adjustments.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A silicon carbide powder anti-agglomeration treatment device, characterized in that: include: A tower body (1), the tower body (1) comprising: a stirring chamber (11), an isolation chamber (12), and a spray drying chamber (13) arranged in sequence along the axial direction of the tower body (1), the stirring chamber (11) and the spray drying chamber (13) being connected via a guide chamber (14) penetrating the isolation chamber (12); A stirring device (2) disposed in the stirring chamber (11), the stirring device (2) comprising: a driving motor (21) disposed at the top of the tower body (1); a rotating shaft (22) connected to the driving motor (21) via a coupling and penetrating the stirring chamber (11) and the guide chamber (14) and extending to the spray drying chamber (13); and a stirring assembly (23) disposed in the stirring chamber (11) and connected to the rotating shaft (22); A centrifugal spray device (3) connected to the end of the rotating shaft (22).

2. The silicon carbide powder anti-agglomeration treatment device according to claim 1, characterized in that: The bottom of the stirring chamber (11) is configured as a conical closing structure, and the guide chamber (14) is connected to the lowest point of the conical closing structure.

3. The silicon carbide powder anti-agglomeration treatment device according to claim 1, characterized in that: The bottom of the spray drying chamber (13) is arranged as a conical closing structure, and a hot air blower (6) is symmetrically arranged on the outer wall of the shell of the conical closing structure of the spray drying chamber (13).

4. The silicon carbide powder anti-agglomeration treatment device according to claim 1, characterized in that: Also includes: A product recovery unit (4) connected to the bottom of the spray drying chamber (13); the product recovery unit (4) comprises: a discharge pipe (41) connected to the bottom end of the spray drying chamber (13) via a flange; and a cyclone separator (132) connected to the end of the discharge pipe (41).

5. The silicon carbide powder anti-agglomeration treatment device according to claim 4, characterized in that: A communicating pipe (5) is provided between the air outlet of the cyclone separator (132) and the stirring chamber (11).

6. The silicon carbide powder anti-agglomeration treatment device according to claim 5, characterized in that: The communicating tube (5) comprises: a first conduit (51) extending upwardly along the axial direction of the tower body (1) to be flush with the top surface of the tower body (1); a second conduit (52) connected to the output end of the first conduit (51) and extending downwardly; and a third conduit (53) connected to the output end of the second conduit (52) and bent upwardly to pass through the bottom of the stirring chamber (11).

7. The silicon carbide powder anti-agglomeration treatment device according to claim 1, characterized in that: The top of the tower body (1) is provided with an air outlet (7).

8. The silicon carbide powder anti-agglomeration treatment device according to claim 1, characterized in that: An observation window (8) is provided on the tower body (1).

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