A device for preparing a hundred-micron alumina microsphere

Abstract

The utility model relates to alumina microsphere preparation technical field, concretely relates to a kind of preparation device of hundred-micron alumina microsphere, including feeding device, with the feeding pipe of feeding device connection, still including heating kettle, solvent cylinder being set in heating kettle, rotating shaft being rotationally arranged in solvent cylinder, rotating cavity being set in the lower end of rotating shaft and located in solvent cylinder, multiple micropore tubes being annularly arranged on rotating cavity, stirring paddle being set in the lower end of rotating cavity, servo motor being set in the upper end of heating kettle;The upper end of heating kettle is provided with the jack for the insertion of solvent cylinder, the rotating shaft is rotationally arranged in the upper side of heating kettle and is drivingly connected with servo motor, the upper end of rotating shaft is connected with feeding pipe, and the lower end is inserted in solvent cylinder.This device preparation hundred-micron alumina microsphere's specific surface area is large, and particle size is uniform, and equipment structure is not complex, easy to operate, and low in cost.

Description

Technical Field

[0001] This utility model relates to the field of alumina microsphere preparation technology, specifically to a device for preparing alumina microspheres of 100 micrometers. Background Technology

[0002] Alumina (Al2O3) is an inorganic material with excellent performance. It has high mechanical strength, and when made into microspheres, it can withstand greater pressure and friction, is not easy to break or deform, and has a long service life. It has a high melting point and can maintain stable physical and chemical properties in high-temperature environments. It is chemically stable and has strong resistance to corrosive media such as acids, alkalis, and salts. It is not easy to undergo chemical reactions and can be used for a long time in harsh chemical environments.

[0003] Alumina spheres of various sizes are available on the market, among which 100-micron alumina microspheres offer a moderate specific surface area, avoiding the problems of easy aggregation and processing difficulties associated with nano-sized microspheres, while also avoiding the relatively small specific surface area of ​​millimeter-sized microspheres. This provides sufficient reaction contact area. 100-micron alumina microspheres exhibit excellent flowability in fluids, facilitating filling, transport, and dispersion. They are particularly suitable for fluidized beds, chromatographic columns, and other equipment requiring free-flowing particles. Furthermore, thanks to their suitable particle size, they can achieve relatively uniform packing in fixed-bed systems, reducing porosity fluctuations and ensuring the stability of reaction or filtration processes. With the inherent advantages of the material and the characteristics brought by their size, 100-micron alumina microspheres have irreplaceable application value in chemical, materials, pharmaceutical, and precision manufacturing fields.

[0004] Currently, the main methods for preparing microsphere alumina include mechanical crushing, spray forming, template forming, and microfluidic monodisperse spheroidization. Each method has its advantages and disadvantages. For example, mechanical crushing produces microspheres with poor particle size distribution and sphericity, a rough surface, and a tendency to produce defects. While spray forming is common, the particle size distribution sometimes fails to meet requirements, resulting in microspheres with a very wide size distribution that requires sieving before use, undoubtedly increasing material waste and costs. Template forming requires additional materials, increasing preparation costs and complexity, and the resulting microspheres have low morphological regularity. Microfluidic monodisperse spheroidization, due to its ability to precisely manipulate droplets and control the composition of both the continuous and dispersed phases, can effectively solve these problems. Utility Model Content

[0005] To address the technical problems of surface roughness, poor sphericity, and high preparation cost in the preparation of 100-micron alumina microspheres in the prior art, this invention provides a device for preparing 100-micron alumina microspheres. The prepared 100-micron alumina microspheres have a large specific surface area and uniform particle size. Furthermore, the device has a simple structure, is easy to operate, and has low cost.

[0006] The technical solution adopted in this utility model is to provide a device for preparing 100-micron alumina microspheres, including a feeding device, a feeding pipe connected to the feeding device, a heating vessel, a solvent cylinder disposed in the heating vessel, a rotating shaft disposed in the solvent cylinder, a rotating cavity disposed at the lower end of the rotating shaft and located in the solvent cylinder, a plurality of microporous tubes arranged in a ring array on the rotating cavity, a stirring blade disposed at the lower end of the rotating cavity, and a servo motor disposed at the upper end of the heating vessel; the upper end of the heating vessel is provided with an insertion hole for inserting the solvent cylinder, the solvent cylinder has a cylindrical structure with an open upper end and a closed lower end, and the lower end is inserted into the heating vessel through the insertion hole, the rotating shaft is rotatably disposed above the heating vessel and is drivenly connected to the servo motor, the upper end of the rotating shaft is connected to the feeding pipe, and the lower end is inserted into the solvent cylinder, the rotating shaft has a hollow shaft structure, and the lower end is fixed and connected to the center position of the upper end of the rotating cavity, the inner end of the microporous tube is fixed and connected to the rotating cavity, and the outer end extends horizontally.

[0007] The rotating cavity has an oval-shaped structure.

[0008] It also includes a cover set at the upper end of the heating vessel, a shaft frame set inside the cover, a transmission gear set on the rotating shaft, and a drive gear set on the drive end of the servo motor and meshing with the transmission gear; the cover has a cylindrical structure with the upper end closed and the lower end open, the upper end of the rotating shaft, the upper end of the solvent cylinder and the servo motor are all located inside the cover, the servo motor is fixed on the inner wall of the cover, the upper end of the rotating shaft is rotatably mounted on the shaft frame, and the output end of the feeding pipe passes through the cover and is connected to the upper end of the rotating shaft.

[0009] The feeding device includes a feeding needle and a needle pump. The feeding needle is mounted on the needle pump and the output end of the feeding needle is connected to the input end of the feeding tube.

[0010] The beneficial effects of this invention are that it provides a device for preparing 100-micron alumina microspheres. After drawing alumina sol, a syringe is attached to a syringe pump. Under the action of the syringe pump, the alumina sol is transported from the syringe through a feeding tube and a rotating shaft into a rotating chamber. The rotating chamber rotates under the drive of the rotating shaft, and the alumina sol inside disperses from the microporous tubes on the rotating chamber into a solvent cylinder under centrifugal force to form gel microspheres. The gel microspheres are then solidified in the solvent by heating in a heating kettle. Further solidification, drying, and calcination are then performed to obtain the alumina microspheres. By controlling the inner diameter of the microporous tubes and the rotation speed of the rotating shaft, 100-micron alumina microspheres with uniform particle size and a large specific surface area can be obtained. This device has a low structural complexity, is easy to operate and control, and has low equipment cost. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] In the attached diagram, 1 is the feeding pipe, 2 is the heating vessel, 3 is the solvent cylinder, 4 is the rotating shaft, 5 is the rotating cavity, 6 is the microporous tube, 7 is the stirring blade, 8 is the servo motor, 9 is the cover, 10 is the shaft frame, 11 is the transmission gear, 12 is the drive gear, 13 is the syringe, and 14 is the syringe pump. Detailed Implementation

[0013] like Figure 1 As shown, this utility model provides a device for preparing 100-micron alumina microspheres, including a feeding device, a feeding pipe 1 connected to the feeding device, a heating vessel 2, a solvent cylinder 3 disposed in the heating vessel 2, a rotating shaft 4 rotatably disposed in the solvent cylinder 3, a rotating cavity 5 disposed at the lower end of the rotating shaft 4 and located in the solvent cylinder 3, a plurality of microporous tubes 6 arranged in a ring array on the rotating cavity 5, a stirring blade 7 disposed at the lower end of the rotating cavity 5, and a servo motor 8 disposed at the upper end of the heating vessel 2; the upper end of the heating vessel 2 is provided with an insertion hole for inserting the solvent cylinder 3, the solvent cylinder 3 has a cylindrical structure with an open upper end and a closed lower end, and the lower end is inserted into the heating vessel 2 through the insertion hole, the rotating shaft 4 is rotatably disposed above the heating vessel 2 and is connected to the servo motor 8, the upper end of the rotating shaft 4 is connected to the feeding pipe 1, and the lower end is inserted into the solvent cylinder 3, the rotating shaft 4 has a hollow shaft structure, and the lower end is fixed and connected to the center position of the upper end of the rotating cavity 5, the inner end of the microporous tube 6 is fixed and connected to the rotating cavity 5, and the outer end is horizontally suspended.

[0014] The rotating shaft 4 is a hollow shaft structure with perforations along its centerline. The rotating shaft 4 is rotatably mounted above the heating vessel 2 via a bracket. The solvent cylinder 3 is a cylindrical structure with a closed lower end. The lower end of the solvent cylinder 3 is inserted into a pre-set port at the upper end of the heating vessel 2. The lower end of the solvent cylinder 3 rests against the bottom of the inner cavity of the heating vessel 2. The heating vessel 2 contains a heat-conducting medium, such as water, and the solvent cylinder 3 contains solvent. The rotating cavity 5 and the stirring blade 7 at the lower end of the rotating shaft 4 are both immersed in the solvent. The rotating cavity 5 is a sealed circular cavity. The servo motor 8 drives the rotating shaft 4 to rotate. The rotation of the rotating shaft 4 causes the rotating cavity 5 and the stirring blade 7 to rotate in the solvent inside the solvent cylinder 3. The microporous tube 6 is installed on the outer periphery of the rotating cavity 5. The microporous tube 6 is a tubular structure with a pore size of one hundred micrometers and is connected to the inner cavity of the rotating cavity 5.

[0015] The feeding device stores alumina sol. During use, the heating vessel 2 is adjusted to a suitable temperature. The feeding device transports the alumina sol into the rotating cavity 5 through the feeding device, feeding pipe 1, and rotating shaft 4. The servo motor 8 drives the rotating cavity 5 to rotate through the rotating shaft 4. Under the action of centrifugal force and shear force, the alumina sol in the rotating cavity 5 is thrown out from the microporous tube 6 and enters the solvent in the solvent cylinder 3. The stirring blades 7 at the lower end of the rotating cavity 5 rotate synchronously, so that the solvent is in a state of rotational motion, ensuring that the alumina sol in the solvent does not sink to the bottom. It undergoes preliminary solidification under the heating of the heating vessel 2. After solid-liquid separation, drying, and calcination, alumina microspheres of hundreds of micrometers are obtained.

[0016] like Figure 1 As shown, the rotating cavity 5 has a rugby ball-shaped structure. The shape of the rotating cavity 5 is rugby ball-shaped, that is, the cross-section is elliptical. The microporous tube 6 is installed at the apex of the side of the rotating cavity 5, which makes it easier and smoother for the sol to move towards the position of the microporous tube 6 under the action of centrifugal force.

[0017] like Figure 1 As shown, it also includes a cover 9 disposed on the upper end of the heating vessel 2, a shaft bracket 10 disposed inside the cover 9, a transmission gear 11 disposed on the rotating shaft 4, and a drive gear 12 disposed on the drive end of the servo motor 8 and meshing with the transmission gear 11; the cover 9 has a cylindrical structure with the upper end closed and the lower end open. The upper end of the rotating shaft 4, the upper end of the solvent cylinder 3, and the servo motor 8 are all located inside the cover 9. The servo motor 8 is fixed on the inner wall of the cover 9. The upper end of the rotating shaft 4 is rotatably mounted on the shaft bracket 10. The output end of the feeding pipe 1 passes through the cover 9 and is connected to the upper end of the rotating shaft 4.

[0018] The cover 9 covers the upper end of the heating vessel 2 and serves as a protective function. The servo motor 8 is fixed inside the cover 9, and the fixing method is not limited. The rotating shaft 4 is rotatably mounted on the shaft bracket 10, and the structure of the shaft bracket 10 is not limited. The transmission between the servo motor 8 and the rotating shaft 4 is achieved through the transmission gear 11 and the drive gear 12. The structural design is simple and effective, easy to assemble, and low in cost.

[0019] like Figure 1 As shown, the feeding device includes a feeding needle tube 13 and a needle pump 14. The feeding needle tube 13 is mounted on the needle pump 14 and the output end of the feeding needle tube 13 is connected to the input end of the feeding tube 1.

[0020] The feeding syringe 13 draws out the prepared alumina sol, which is then injected into the feeding tube 1 by the syringe pump 14. After the alumina sol in the feeding syringe 13 is injected, it is manually removed from the syringe pump 14 and the alumina sol is manually drawn out again. The operation is simple, time-saving and labor-saving.

Claims

1. An apparatus for preparing 100-micron alumina microspheres, comprising a feeding device and a feeding pipe (1) connected to the feeding device, characterized in that: It also includes a heating vessel (2), a solvent cylinder (3) disposed in the heating vessel (2), a rotating shaft (4) disposed in the solvent cylinder (3), a rotating cavity (5) disposed at the lower end of the rotating shaft (4) and located in the solvent cylinder (3), a plurality of microporous tubes (6) arranged in a ring array on the rotating cavity (5), a stirring blade (7) disposed at the lower end of the rotating cavity (5), and a servo motor (8) disposed at the upper end of the heating vessel (2); The upper end of the heating vessel (2) is provided with an insertion hole for the solvent cylinder (3) to be inserted. The solvent cylinder (3) has a cylindrical structure with an open upper end and a closed lower end, and the lower end is inserted into the heating vessel (2) through the insertion hole. The rotating shaft (4) is rotatably set above the heating vessel (2) and is connected to the servo motor (8) for transmission. The upper end of the rotating shaft (4) is connected to the feeding pipe (1), and the lower end is inserted into the solvent cylinder (3). The rotating shaft (4) has a hollow shaft structure, and the lower end is fixed and connected to the center position of the upper end of the rotating cavity (5). The inner end of the microporous tube (6) is fixed and connected to the rotating cavity (5), and the outer end is horizontally suspended.

2. The apparatus for preparing 100-micron alumina microspheres according to claim 1, characterized in that: The rotating cavity (5) has an oval-shaped structure.

3. The apparatus for preparing 100-micron alumina microspheres according to claim 1, characterized in that: It also includes a cover (9) set on the upper end of the heating vessel (2), a shaft frame (10) set inside the cover (9), a transmission gear (11) set on the rotating shaft (4), and a drive gear (12) set on the drive end of the servo motor (8) and meshing with the transmission gear (11); the cover (9) has a cylindrical structure with the upper end closed and the lower end open. The upper end of the rotating shaft (4), the upper end of the solvent cylinder (3) and the servo motor (8) are all located inside the cover (9). The servo motor (8) is fixed on the inner wall of the cover (9). The upper end of the rotating shaft (4) is rotatably mounted on the shaft frame (10). The output end of the feed pipe (1) passes through the cover (9) and is connected to the upper end of the rotating shaft (4).

4. The apparatus for preparing 100-micron alumina microspheres according to claim 1, characterized in that: The feeding device includes a feeding needle (13) and a needle pump (14). The feeding needle (13) is mounted on the needle pump (14) and the output end of the feeding needle (13) is connected to the input end of the feeding tube (1).

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