Rotary kiln for preparing zirconium oxide

Abstract

The utility model relates to a rotary kiln for preparing zirconium oxide, and relates to the technical field of zirconium oxide preparation equipment, the rotary kiln is sequentially and rotatably provided with a metal kiln cylinder, a ceramic kiln cylinder and a cooling kiln cylinder, zirconium hydroxide and zirconium oxide materials are firstly heated in the metal kiln cylinder so as to dehumidify and remove impurities; then, sintering is carried out in a ceramic kiln cylinder, and zirconium hydroxide is converted into zirconium oxide; and finally, cooling in the cooling kiln cylinder. The process can realize automatic, continuous and uninterrupted production, so that the stability and continuity of zirconium oxide are ensured, and the industrial production requirements are met. Meanwhile, the metal kiln barrel is made of 310S stainless steel materials, the ceramic kiln barrel inner container is made of high-purity zirconia ceramic, the purity of products is guaranteed, and therefore high-purity zirconia powder can be prepared. In addition, the cooling kiln barrel is made of metal materials, the cooling speed is effectively increased, the production cycle is greatly shortened, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of zirconium oxide preparation equipment, specifically to a rotary kiln for preparing zirconium oxide. Background Technology

[0002] Zirconia possesses excellent chemical stability and is the only transition metal oxide that simultaneously possesses both acidic and basic surface sites. It also exhibits outstanding ion exchange performance and abundant oxygen vacancies on its surface, thus enabling it to be used as a catalyst alone, or as a catalyst support or promoter in the field of catalysis. Zirconia exhibits strong acidity and high thermal stability, making it widely applicable in catalytic processes such as olefin hydrogenation, epoxidation, alcohol dehydration, and condensation reactions.

[0003] In the field of functional thin film materials, zirconia possesses excellent heat resistance, thermal insulation, optical properties, electrical properties, mechanical properties, and chemical stability. It can be used as a thermal barrier coating, insulating coating, wear-resistant coating, corrosion-resistant coating, and material for optoelectronic devices. Therefore, zirconia has broad application prospects in aerospace, steel metallurgy, machinery manufacturing, optics, and electronics. As an optical film material, zirconia can be used in important optical components such as laser mirrors, high-refractive-index mirrors, and broadband interference filters.

[0004] Furthermore, zirconium oxide can significantly improve the physical properties of materials (such as powders or ceramic bodies), enhancing the toughness and plasticity of ceramic bodies, reducing brittleness, and decreasing the risk of fracture. Simultaneously, it helps lower the sintering temperature of ceramic bodies, increasing the density and hardness of sintered bodies, and enhancing wear resistance and impact toughness. Therefore, zirconium oxide has significant application value in industrial synthesis, catalysts, catalyst supports, and special ceramics.

[0005] However, to date, the preparation of high-quality zirconia ultrafine powder with precise composition and uniform particle size still faces challenges of high cost and low yield. How to reduce costs and increase yield to achieve its industrial production and application is a pressing issue that needs to be addressed. Utility Model Content

[0006] Therefore, this utility model provides a rotary kiln for preparing zirconium oxide, aiming to achieve stable and continuous industrial production of zirconium oxide.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A rotary kiln for preparing zirconia includes a first operating platform, a second operating platform, and a third operating platform arranged sequentially. Both the first and second operating platforms are tiltable. The first operating platform has a rotatable metal kiln shell and a fixed first driving device for driving the metal kiln shell to rotate. The second operating platform has a rotatable ceramic kiln shell and a fixed second driving device for driving the ceramic kiln shell to rotate. The third operating platform has a rotatable cooling kiln shell and a fixed third driving device for driving the cooling kiln shell to rotate. A first feed hood and a feed pan are fixedly installed on the left and right sides of the first operating platform, respectively. A first discharge hood; both the first feed hood and the first discharge hood are rotatably connected to the metal kiln body. The first feed hood is used to close the left end of the metal kiln body, and the first discharge hood is used to close the right end of the metal kiln body. A second feed hood and a second discharge hood are fixedly installed on the left and right sides of the second operating platform, respectively. Both the second feed hood and the second discharge hood are rotatably connected to the ceramic kiln body. The second feed hood is used to close the left end of the ceramic kiln body, and the second discharge hood is used to close the right end of the ceramic kiln body. A third operating platform is fixedly installed on the left and right sides, respectively. A third feed hood and a third discharge hood; both the third feed hood and the third discharge hood are rotatably connected to the cooling kiln body. The third feed hood is used to close the left end of the cooling kiln body, and the third discharge hood is used to close the right end of the cooling kiln body. The metal kiln body is made of 310S stainless steel, and a heating box is fitted around its outer periphery for heating the metal kiln body. The inner liner of the ceramic kiln body is a zirconia ceramic liner, and heating wires are embedded in its cylinder wall for heating the ceramic kiln body. The cooling kiln body is made of metal. A feeder is also provided on the left side of the second operating platform. The screw feeder can move through the second feed hood and extend into the ceramic kiln body; the feeder is located below the first discharge hood; the feeder's hopper is connected to the bottom of the first discharge hood through a second chute; the third feed hood is located below the second discharge hood; the top of the third feed hood is connected to the bottom of the second discharge hood through a third chute; a feeding bin is provided above the first feed hood; a first chute is provided at the bottom of the feeding bin; the bottom of the first chute passes through the first feed hood and extends into the metal kiln body; a discharge hopper is provided at the bottom of the third discharge hood for material discharge.

[0009] Preferably, a spray box is provided around the outer periphery of the cooling kiln shell for spraying cooling liquid onto the cooling kiln shell to lower its temperature.

[0010] Optionally, a first bracket is threadedly connected to the bottom of the first operating table near the first feed hood area; a second bracket is hinged to the bottom of the first operating table near the first discharge hood area; a third bracket is threadedly connected to the bottom of the second operating table near the second feed hood area; and a fourth bracket is hinged to the bottom of the second operating table near the second discharge hood area.

[0011] Preferably, multiple long strip-shaped lifting plates are radially evenly distributed on the inner wall of the metal kiln shell; the lifting plates are arranged along the axial direction of the metal kiln shell.

[0012] Preferably, the inner wall of the cooling kiln cylinder is provided with spiral feeding blades along the axial direction.

[0013] Preferably, the third discharge hood is provided with a first input pipe for injecting clean and dry air; the second feed hood is provided with a first output pipe for discharging mixed air; the end of the first output pipe away from the second feed hood is connected to the first discharge hood; the first discharge hood is provided with a second input pipe for injecting clean and dry air; and the first feed hood is provided with a second output pipe for discharging mixed air.

[0014] Preferably, it further includes a high-temperature dust removal device; the second output pipe is connected to the high-temperature dust removal device and is used to remove dust and purify the mixed air.

[0015] This utility model has at least the following beneficial effects:

[0016] The system consists of a rotatable metal kiln body, a ceramic kiln body, and a cooling kiln body. Zirconium hydroxide and zirconium oxide materials are first heated in the metal kiln body to dehumidify and remove impurities. Then, they are sintered in the ceramic kiln body to convert zirconium hydroxide into zirconium oxide. Finally, they are cooled in the cooling kiln body. This process enables automated, continuous, and uninterrupted production, ensuring the stability and continuity of zirconium oxide and meeting the needs of industrial production. Furthermore, the metal kiln body is made of 310S stainless steel, and the inner liner of the ceramic kiln body is made of high-purity zirconium oxide ceramic, ensuring the purity of the product and enabling the preparation of high-purity zirconium oxide powder. In addition, the cooling kiln body is made of metal, effectively increasing the cooling rate, significantly shortening the production cycle, and improving production efficiency. Attached Figure Description

[0017] To more clearly illustrate the prior art and the present invention, the accompanying drawings used in the description of the prior art and the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other drawings from the provided drawings without any creative effort.

[0018] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which this utility model can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0019] Figure 1 This is a front view of a rotary kiln for preparing zirconium oxide according to the present invention;

[0020] Figure 2 This utility model relates to a rotary kiln for preparing zirconium oxide. Figure 1 Enlarged view of section A;

[0021] Figure 3 This utility model relates to a rotary kiln for preparing zirconium oxide. Figure 1 A magnified view of section B;

[0022] Figure 4 This utility model relates to a rotary kiln for preparing zirconium oxide. Figure 1 A magnified view of section C;

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. First operating platform; 2. Second operating platform; 3. Third operating platform; 4. Heating box; 5. Metal kiln shell; 6. First feed hood; 7. First discharge hood; 8. Feeding bin; 9. First chute; 10. Ceramic kiln shell; 11. Second feed hood; 12. Second discharge hood; 13. Second chute; 14. Cooling kiln shell; 15. Spray box; 16. Third feed hood; 17. Third discharge hood; 18. Third chute; 19. Material vacuum conveying equipment; 20. High-temperature dust removal device; 21. First support; 22. Second support; 23. First drive device; 24. Second drive device; 25. Third support; 26. Fourth support; 27. Discharge hopper; 28. Feeder. Detailed Implementation

[0025] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] In the description of this application: unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," "third," etc., in this application are intended to distinguish the objects referred to and do not have any special meaning in terms of technical connotation (e.g., they should not be construed as an emphasis on importance or order). Expressions such as "comprising," "including," and "having" also mean "not limited to" (certain units, components, materials, steps, etc.).

[0027] The terms used in this application, such as "upper," "lower," "left," "right," and "middle," are generally used to facilitate intuitive understanding by referring to the accompanying drawings, and are not absolute limitations on the positional relationships in the actual product. Changes in these relative positional relationships, without departing from the technical concept disclosed in this application, should also be considered within the scope of this application.

[0028] This utility model discloses a rotary kiln for preparing zirconium oxide, such as... Figures 1 to 4As shown, a first operating platform 1, a second operating platform 2, and a third operating platform 3 are arranged sequentially. Both the first operating platform 1 and the second operating platform 2 can be tilted. The first operating platform 1 is rotatably mounted on the metal kiln shell 5. Specifically, it can employ a rotary kiln rotating device well-known to those skilled in the art, i.e., a rolling ring is fitted onto the outer wall of the metal kiln shell 5, and a roller corresponding to the rolling ring is fixedly mounted on the first operating platform 1. The rolling ring is placed on the roller and rolls on the roller. Simultaneously, a first driving device 23 for driving the metal kiln shell 5 to rotate is fixedly mounted on the first operating platform 1. The first driving device also employs a rotary kiln rotating driving device well-known to those skilled in the art, i.e., a pin wheel is fitted onto the outer wall of the metal kiln shell 5, and a reduction motor is fixedly mounted on the first operating platform 1. The reduction motor is connected to the pin wheel, driving the pin wheel to rotate, thereby causing the metal kiln shell 5 to rotate. The second operating platform 2 is rotatably mounted on the ceramic kiln cylinder 10. Specifically, it can adopt a rotary kiln rotating device well known to those skilled in the art, that is, a rolling ring is fitted on the outer wall of the ceramic kiln cylinder 10, and a roller corresponding to the rolling ring is fixedly mounted on the second operating platform 2. The rolling ring is placed on the roller and rolls on the roller. At the same time, a second driving device 2 for driving the ceramic kiln cylinder 10 to rotate is fixedly mounted on the second operating platform 2. The second driving device also adopts a rotary kiln rotating driving device well known to those skilled in the art, that is, a pin wheel is fitted on the outer wall of the ceramic kiln cylinder 10, and a reduction motor is fixedly mounted on the second operating platform 2. The reduction motor is connected to the pin wheel and drives the pin wheel to rotate, thereby driving the ceramic kiln cylinder 10 to rotate. The third operating platform 3 is rotatably mounted on the cooling kiln cylinder 14. Specifically, it can adopt a rotary kiln rotating device well known to those skilled in the art, that is, a rolling ring is fitted on the outer wall of the cooling kiln cylinder 14, and a roller corresponding to the rolling ring is fixedly mounted on the third operating platform 3. The rolling ring is placed on the roller and rolls on the roller. A third driving device (not shown in the figure) for driving the cooling kiln cylinder 14 to rotate is fixedly mounted on the third operating platform 3. The third driving device also adopts a rotary kiln rotating driving device well known to those skilled in the art, that is, a pin wheel is fitted on the outer wall of the cooling kiln cylinder 14, and a reduction motor is fixedly mounted on the third operating platform 3. The reduction motor is connected to the pin wheel and drives the pin wheel to rotate, thereby driving the cooling kiln cylinder 14 to rotate. The first operating platform 1 is fixedly equipped with a first feed hood 6 and a first discharge hood 7 on its left and right sides, respectively. Both the first feed hood 6 and the first discharge hood 7 are rotatably connected to the metal kiln body 5. Both the first feed hood 6 and the first discharge hood 7 adopt the feed and discharge hoods of the existing rotary kiln, which are existing technologies and will not be described in detail here. The first feed hood 6 is used to close the left end of the metal kiln body 5, and the first discharge hood 7 is used to close the right end of the metal kiln body 5.The second operating platform 2 has a second feed hood 11 and a second discharge hood 12 fixedly installed on its left and right sides, respectively. Both the second feed hood 11 and the second discharge hood 12 are rotatably connected to the ceramic kiln body 10. The second feed hood 11 and the second discharge hood 12 are both existing rotary kiln feed and discharge hoods, which are existing technologies and will not be described in detail here. The second feed hood 11 is used to close the left end of the ceramic kiln body 10, and the second discharge hood 12 is used to close the right end of the ceramic kiln body 10. The third operating platform 3 has a third feed hood 16 and a third discharge hood 17 fixedly installed on its left and right sides, respectively. Both the third feed hood 16 and the third discharge hood 17 are rotatably connected to the cooling kiln body 14. Both the third feed hood 16 and the third discharge hood 17 are existing rotary kiln feed and discharge hoods, which are existing technologies and will not be described in detail here. The third feed hood 16 is used to close the left end of the cooling kiln body 14, and the third discharge hood 17 is used to close the right end of the cooling kiln body 14. To prevent contamination of zirconium oxide by the metal kiln shell 5 and to produce high-purity zirconium oxide, the metal kiln shell 5 is made of 310S stainless steel and has a heating box 4 surrounding it. This heating box 4 is used to heat the material inside the metal kiln shell 5 to 260–380°C, preferably 300°C. Specifically, to achieve optimal heating, the heating wires inside the heating box 4 are located at the bottom of the box. To prevent contamination of zirconium oxide by the ceramic kiln shell 10 and to produce high-purity zirconium oxide, the inner liner of the ceramic kiln shell 10 is a zirconium oxide ceramic liner. Heating wires are embedded in the cylinder wall to heat the material inside the ceramic kiln shell 10 to 450–800°C. The cooling kiln shell 14 is made of metal to accelerate material cooling. A feeder 28 is also provided on the left side of the second operating platform 2. The spiral feeding rod of the feeder 28 can pass through the second feed hood 11 and extend into the ceramic kiln shell 10 to feed material into the ceramic kiln shell 10. The feeder 28 is located below the first discharge hood 7, and its hopper is connected to the bottom of the first discharge hood 7 via the second chute 13. The third feed hood 16 is located below the second discharge hood 12, and its top is connected to the bottom of the second discharge hood 12 via the third chute 18. A feeding bin 8 is located above the first feed hood 6, and a first chute 9 is located at the bottom of the feeding bin 8. The bottom of the first chute 9 passes through the first feed hood 6 and extends into the metal kiln shell 5. A discharge hopper 27 is located at the bottom of the third discharge hood 17 for material discharge. Because the prepared zirconium oxide is a powder, a commercially available vacuum conveying device 19 is usually installed for easy transportation to facilitate its transport to the next process.

[0029] Preferably, in order to accelerate the cooling of materials in the cooling kiln body 14, a spray box 15 is provided around the outer periphery of the cooling kiln body 14. The spray box 15 is a prior art product, which usually has multiple nozzles at the top. Spray liquid (water) is sprayed from the nozzles to spray cooling liquid onto the cooling kiln body 14 for cooling.

[0030] Optionally, this application embodiment provides a specific implementation of the tiltable arrangement of the first operating platform 1 and the second operating platform 2, specifically: the bottom of the first operating platform 1 near the area of ​​the first feed hood 6 is threadedly connected to a first bracket 21; the bottom of the first operating platform 1 near the area of ​​the first discharge hood 7 is hinged to a second bracket 22. The bottom of the second operating platform 2 near the area of ​​the second feed hood 11 is threadedly connected to a third bracket 25; the bottom of the second operating platform 2 near the area of ​​the second discharge hood 12 is hinged to a fourth bracket 26. By adjusting the tilt of the first operating platform 1 and the second operating platform 2, the material movement speed can be adjusted to meet the process requirements.

[0031] Preferably, in order to ensure that the material is fully stirred when it tumbles inside the metal kiln body 5, multiple long strip-shaped lifting plates are evenly distributed radially on the inner wall of the metal kiln body 5, and the lifting plates are arranged along the axial direction of the metal kiln body 5.

[0032] Preferably, in order to make the material tumble and move inside the cooling kiln cylinder 14, the inner wall of the cooling kiln cylinder 14 is provided with spiral feeding blades along the axial direction. In this way, when the cooling kiln cylinder 14 rotates, the material tumbles on the spiral feeding blades and is slid forward and conveyed.

[0033] Preferably, during the heating and preparation of zirconia within the ceramic kiln shell 10, to maintain the required process atmosphere and remove moisture generated during the material reaction, a first input pipe for injecting clean, dry air is provided in the third discharge hood 17, and a first output pipe for discharging mixed air is provided in the second feed hood 11. Injecting clean, dry air maintains the process atmosphere within the ceramic kiln shell 10 and also helps to remove moisture generated during the material reaction. After flowing through the ceramic kiln shell 10, the clean, dry air becomes a higher-temperature mixed air and is discharged through the first output pipe for waste heat reuse. The end of the first output pipe furthest from the second feed hood 11 is connected to the first discharge hood 7, so that the higher-temperature mixed air from the ceramic kiln shell 10 can be introduced into the metal kiln shell 5 to heat and dehumidify the material. Simultaneously, during the heating and dehumidification process within the metal kiln shell 5, a large amount of moisture and flue gas is generated. To facilitate the discharge of this moisture and flue gas, a second input pipe for injecting clean, dry air is provided in the first discharge hood 7, and a second output pipe for discharging mixed air is provided in the first feed hood 6. Injecting clean, dry air assists in the discharge of moisture and flue gas. To accelerate the discharge of mixed air and enhance the flow of clean, dry air, a dust removal fan is usually installed on the second output pipe.

[0034] Preferably, the mixed air discharged from the second output pipe contains a large number of dust particles and smoke particles. In order to filter these harmful particles and protect the environment, a high-temperature dust removal device 20 is also included. The high-temperature dust removal device 20 adopts a commercially available product, such as a high-temperature dust removal device with a stainless steel sintered filter element. The second output pipe is connected to the high-temperature dust removal device 20 for dust removal and purification of the mixed air.

[0035] The working principle of the rotary kiln equipment in this application is as follows:

[0036] Zirconium hydroxide and zirconium oxide materials, pressed into filter cake form, enter the metal kiln body through the first chute from the feeding hopper and are heated and dehumidified. After dehumidification, they fall into the feeder through the second chute. The feeder sends the zirconium hydroxide and zirconium oxide materials into the ceramic kiln body for heat treatment, converting zirconium hydroxide into zirconium oxide, while further purifying and removing impurities. The prepared zirconium oxide falls into the cooling kiln body through the third chute to cool down, and then is discharged from the discharge hopper.

[0037] The present application has been described in a relatively specific and detailed manner above through general descriptions and specific embodiments. It should be understood that, based on the technical concept of the present application, several conventional adjustments or further innovations can be made to these specific embodiments; however, as long as they do not depart from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the protection scope of the claims of the present application.

Claims

1. A rotary kiln for preparing zirconium oxide, characterized in that, The system includes a first operating platform (1), a second operating platform (2), and a third operating platform (3) arranged sequentially. Both the first operating platform (1) and the second operating platform (2) can be tilted. The first operating platform (1) rotatably houses a metal kiln shell (5) and is fixedly equipped with a first driving device (23) for driving the metal kiln shell (5) to rotate. The second operating platform (2) rotatably houses a ceramic kiln shell (10) and is fixedly equipped with a second driving device (24) for driving the ceramic kiln shell (10) to rotate. The third operating platform (3) rotatably houses a cooling kiln shell (14) and is fixedly equipped with a third driving device for driving the cooling kiln shell (14) to rotate. The first operating platform (1) has a first inlet valve fixedly installed on its left and right sides. Material hood (6) and first discharge hood (7); the first material hood (6) and the first discharge hood (7) are rotatably connected to the metal kiln body (5). The first material hood (6) is used to close the left end of the metal kiln body (5), and the first discharge hood (7) is used to close the right end of the metal kiln body (5). The second operating platform (2) is fixedly provided with a second material hood (11) and a second discharge hood (12) on its left and right sides, respectively. The second material hood (11) and the second discharge hood (12) are rotatably connected to the ceramic kiln body (10). The second material hood (11) is used to close the left end of the ceramic kiln body (10), and the second discharge hood (12) is used to close the right end of the ceramic kiln body (5). 10) The right end is closed; the third operating platform (3) is fixedly provided with a third feed hood (16) and a third discharge hood (17) on the left and right sides respectively; the third feed hood (16) and the third discharge hood (17) are rotatably connected to the cooling kiln body (14), the third feed hood (16) is used to close the left end of the cooling kiln body (14), and the third discharge hood (17) is used to close the right end of the cooling kiln body (14); the metal kiln body (5) is made of 310S stainless steel, and a heating box (4) is fitted around its outer periphery for heating the metal kiln body (5); the inner liner of the ceramic kiln body (10) is a zirconia ceramic inner liner, and an electric heating wire is embedded in its cylinder wall for heating the ceramic kiln body. The body (10) is heated; the cooling kiln body (14) is made of metal; a feeder (28) is also provided on the left side of the second operating table (2); the spiral feeding rod of the feeder (28) can move through the second feeding hood (11) and extend into the ceramic kiln body (10); the feeder (28) is located below the first discharge hood (7); the hopper of the feeder (28) is connected to the bottom of the first discharge hood (7) through the second chute (13); the third feeding hood (16) is located below the second discharge hood (12); the top of the third feeding hood (16) is connected to the bottom of the second discharge hood (12) through the third chute (18); a feeding bin (8) is provided above the first feeding hood (6);The bottom of the feeding hopper (8) is provided with a first chute (9); the bottom of the first chute (9) passes through the first feed hood (6) and extends into the metal kiln body (5); the bottom of the third discharge hood (17) is provided with a discharge hopper (27) for material discharge.

2. The rotary kiln for preparing zirconium oxide according to claim 1, characterized in that, The outer periphery of the cooling kiln shell (14) is fitted with a spray box (15) for spraying cooling liquid onto the cooling kiln shell (14) to cool it down.

3. The rotary kiln for preparing zirconium oxide according to claim 1, characterized in that, The bottom of the first operating table (1) near the first feed hood (6) is threadedly connected to a first bracket (21); the bottom of the first operating table (1) near the first discharge hood (7) is hinged to a second bracket (22); the bottom of the second operating table (2) near the second feed hood (11) is threadedly connected to a third bracket (25); the bottom of the second operating table (2) near the second discharge hood (12) is hinged to a fourth bracket (26).

4. The rotary kiln for preparing zirconium oxide according to claim 1, characterized in that, Multiple long strip-shaped lifting plates are evenly distributed radially on the inner wall of the metal kiln body (5); the lifting plates are arranged along the axial direction of the metal kiln body (5).

5. The rotary kiln for preparing zirconium oxide according to claim 1, characterized in that, The inner wall of the cooling kiln cylinder (14) is provided with spiral feeding blades along the axial direction.

6. A rotary kiln for preparing zirconium oxide according to any one of claims 1 to 5, characterized in that, The third discharge hood (17) is provided with a first input pipe for injecting clean and dry air; the second feed hood (11) is provided with a first output pipe for discharging mixed air; the end of the first output pipe away from the second feed hood (11) is connected to the first discharge hood (7); the first discharge hood (7) is provided with a second input pipe for injecting clean and dry air; the first feed hood (6) is provided with a second output pipe for discharging mixed air.

7. The rotary kiln for preparing zirconium oxide according to claim 6, characterized in that, It also includes a high-temperature dust removal device (20); the second output pipe is connected to the high-temperature dust removal device (20) and is used to remove dust and purify the mixed air.

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