Preparation device and method of wet oxidation catalyst

Abstract

The invention relates to the technical field of preparation of wet oxidation catalysts, and particularly discloses a preparation method of a wet oxidation catalyst, the wet oxidation catalyst comprises an alumina-loaded platinum catalyst, and the preparation method comprises the following steps: drying carrier powder to remove surface moisture; adding a metal salt or a metal complex into deionized water, and uniformly stirring at 30-40 DEG C to prepare an impregnation liquid; adding the carrier powder into the impregnation liquid in batches; dipping for 1-3 hours, taking out the carrier, and drying at 100-120 DEG C for 6-12 hours; and putting the dried catalyst into a high-temperature furnace, roasting for 3-4 hours at the roasting temperature of 400-500 DEG C, and slowly cooling to room temperature after roasting, thereby obtaining the catalyst. Batch adding of carrier powder is achieved through the material dispersing disc, the rolling shaft and the grinding strips are matched for grinding during discharging, materials on the inner wall of the dipping barrel are scraped off through the material scraping plate during stirring, and therefore the situation that catalyst raw materials are caked when making contact with a dipping solution is effectively prevented, and the dipping effect of a catalyst is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of the preparation of wet oxidation catalysts, and specifically to a preparation device and method for a wet oxidation catalyst. Background Technique

[0002] Wet oxidation catalysts are a type of catalyst used to promote the degradation of organic matter during the wet oxidation process. It is a technology commonly used to treat wastewater, waste gas, or solid waste containing organic pollutants. It accelerates the oxidation reaction through a high-temperature and high-pressure water environment, converting organic pollutants into harmless substances;

[0003] The impregnation process is one of the important steps in the production of wet oxidation catalysts, usually used to uniformly load the catalyst active components onto the surface of the carrier to improve the performance of the catalyst. During impregnation, the powdered carrier material needs to be placed in the impregnation solution, and the carrier is fully contacted with the solution through soaking, spraying, etc. During the impregnation process, stirring or shaking is also required to promote the contact between the solution and the carrier. In the prior art, during the process of distributing the carrier material, the carrier material is usually all poured into the impregnation solution. This operation method is likely to cause insufficient contact between the carrier material and the impregnation solution, and it is also easy to produce agglomeration phenomena, which will reduce the impregnation product quality of the catalyst. In addition, during the distribution process, the catalyst raw materials floating on the surface of the impregnation solution will contact the inner wall of the impregnation barrel along with the rotating impregnation solution during stirring, and adhere to the inner wall of the impregnation barrel. Summary of the Invention

[0004] The purpose of the present invention is to provide a preparation device and method for a wet oxidation catalyst to solve the problems raised in the above background technique. To achieve the above purpose, the present invention provides the following technical solutions:

[0005] A preparation method for a wet oxidation catalyst, the wet oxidation catalyst includes a platinum catalyst supported on alumina, and the preparation method includes the following steps:

[0006] S1. Dry the carrier powder to remove surface moisture;

[0007] S2. Add metal salts or metal complexes to deionized water and stir evenly at 30 - 40 °C to prepare an impregnation solution;

[0008] S3. Add the carrier powder to the impregnation solution in batches;

[0009] S4. Take out the carrier after impregnation for 1 - 3 h and dry it at 100 - 120 °C for 6 - 12 h;

[0010] S5. Put the dried catalyst into a high-temperature furnace and calcine it for 3 - 4 h, the calcination temperature is 400 - 500 °C, and after calcination, slowly cool it to room temperature to obtain the product;

[0011] Among them, step S3 specifically includes the following sub-steps:

[0012] S31: Place the carrier powder on the bulk material turntable;

[0013] S32: Inject the impregnation liquid into the impregnation barrel;

[0014] S33: The carrier powder leaks in batches through the material leakage port on the bulk material turntable;

[0015] S34: The leaked carrier powder is crushed by the cooperation of the roller and the grinding bar at the bottom of the material leakage port and then scattered into the impregnation barrel, and is continuously stirred;

[0016] S35: During the stirring process, the scraping plate scrapes the viscous material on the inner wall of the impregnation barrel, and the shoveling rod shovels the scraped material.

[0017] Preferably, the way of adding the carrier powder to the impregnation liquid is a combination of adding in batches and multi-stage impregnation, specifically including: after adding the carrier powder a certain number of times, the concentration of the impregnation liquid increases by a certain amount. Among them, the relationship between the concentration of the impregnation liquid and the number of times of adding the carrier powder is expressed as:

[0018]

[0019] Among them, C0 represents the initial concentration (the concentration when the carrier is added for the first time); is the quotient of the number of additions (n) divided by (k), indicating how many times the concentration is adjusted; ΔC is the increase in concentration for each adjustment.

[0020] Exemplarily:

[0021] Initial concentration (C0 = 0.1) M (initial impregnation liquid concentration);

[0022] After adding the carrier every 5 times, the concentration increases by (ΔC = 0.05) M;

[0023] If the current is the 13th time of adding the carrier powder, the concentration is:

[0024]

[0025] This design of adding the carrier powder in batches and increasing the concentration of the impregnation liquid in stages can be represented by the above function formula. By adjusting these parameters, the preparation process of the catalyst can be optimized to achieve the best metal loading and distribution.

[0026] A preparation device for a wet oxidation catalyst, comprising a preparation tank. The top of the preparation tank is fixedly connected with a mounting ring. The top of the mounting ring is fixedly connected with a driving motor. The inside of the mounting ring is provided with a feed hopper. The top of the preparation tank is respectively provided with a dispersion mechanism and a scraping mechanism. The bottom of the preparation tank is provided with an impregnation barrel. The output end of the driving motor is rotationally connected with a stirring shaft, and the bottom of the stirring shaft is arranged inside the impregnation barrel;

[0027] The dispersion mechanism includes a dispersion wheel disc rotatably installed at the top of the preparation tank. The axis of the dispersion wheel disc is fixedly connected with the stirring shaft. The surface of the dispersion wheel disc is penetrated with leakage openings. The top of the leakage opening is fixedly provided with a feed hopper. The inside of the feed hopper is communicated with the leakage opening. A roller is rotatably arranged below the leakage opening. The axis of the roller is fixedly connected with a central abutting rod. Several double-headed wedge plates are arranged around the top of the inner wall of the preparation tank. The two sides of the surface of the double-headed wedge plate are provided as inclined surfaces. The bottom of the dispersion wheel disc near both sides of the leakage opening is fixedly connected with mounting frames. Two columns I are symmetrically arranged at the bottom of the mounting frames. Both of the two columns I are fixedly connected with the mounting frames. A first spring is sleeved on the column I;

[0028] The top of the column I is slidably connected with a lifting plate. The lifting plate is rotationally connected with both ends of the central abutting rod. The bottom of the lifting plate is rotationally connected with a gear. The top of the gear is fixedly connected with a first conical wheel. The side surface of the first conical wheel is engaged with a second conical wheel, and the second conical wheel is fixedly connected with the central abutting rod.

[0029] Preferably, side plates are fixedly installed at both sides of the bottom of the dispersion wheel disc near the leakage opening. Several grinding bars are equidistantly arranged on the inner surface of the side plates. The several grinding bars are arranged in a triangular shape, and the function is to crush the raw materials.

[0030] Preferably, a rack is arranged at the bottom of the double-headed wedge plate. The rack is movably connected with the gear. The function of the gear is to roll the raw materials during the process of dispersing the raw materials.

[0031] Preferably, the distance between the bottom of the double-headed wedge plate and the rack is equal to the distance between the central abutting rod and the gear.

[0032] Preferably, the scraping mechanism includes a sector plate. The bottom of the sector plate is fixedly connected with a single-headed wedge plate. The surface of one side of the single-headed wedge plate is provided as an inclined surface.

[0033] Preferably, a shoveling rod is fixedly connected to the bottom of the sector plate near the single-headed wedge plate. The shoveling rod is arranged in an L shape.

[0034] Preferably, the scraping mechanism further includes a mounting plate fixedly installed on the inner wall of the preparation tank. Two columns are symmetrically arranged at the top of the mounting plate. A second spring is movably sleeved on the columns, and an outer ring plate is slidably connected to the top of the columns.

[0035] Preferably, an inner ring plate is arranged inside the outer ring plate. Both the outer ring plate and the inner ring plate are fan-shaped, and their function is to fit the inner wall of the impregnation barrel, facilitating the scraping operation.

[0036] Preferably, contact heads are fixedly connected to the opposite sides of the outer ring plate and the inner ring plate. A scraping plate is fixedly connected to the bottom of the inner ring plate, and the bottom surface of the scraping plate is in movable contact with the shoveling rod.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] 1. In the present invention, through the arranged spreading mechanism, during the impregnation of the fabric, through the material spreading wheel disk fixedly connected to the stirring shaft, when the material spreading wheel disk rotates, it intermittently opens and closes at multiple points above the impregnation barrel. By controlling the rising and falling of the roller, the catalyst raw material at the leakage port leaks out intermittently, which can effectively prevent the catalyst raw material from agglomerating when contacting the impregnation solution, and is beneficial to improving the impregnation effect of the catalyst.

[0039] 2. In the present invention, through the arranged scraping structure, while the fan-shaped plate rotates following the stirring shaft, the scraping plate can be pressed downward by the single-headed wedge plate, enabling the scraping plate to scrape the adhered materials, and the shoveling rod can shovel the scraped materials and mix them with the impregnation solution to further improve the impregnation effect of the catalyst.

[0040] 3. In the present invention, through the arranged gear and rack, when the central abutting rod contacts the bottom surface of the double-headed wedge plate and the roller moves to the low position, the gear meshes with the rack and drives the roller to rotate. During the rotation of the roller, the catalyst raw material leaking downward is rolled towards the grinding bar, and the catalyst raw material passes between the roller and the grinding bar, which can crush the agglomerated catalyst raw material, increase the specific surface area of the catalyst raw material, and improve the impregnation uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is the overall structural schematic diagram of the present invention;

[0042] Figure 2 is the sectional structural schematic diagram of the preparation tank of the present invention;

[0043] Figure 3 is the structural schematic diagram of the spreading mechanism of the present invention;

[0044] Figure 4 of the present invention Figure 3Schematic diagram of the enlarged structure of area A;

[0045] Figure 5 Schematic diagram of the structure of the bulk material wheel disc and the material leakage port of the present invention;

[0046] Figure 6 For the present invention Figure 6 Schematic diagram of the enlarged structure of area B;

[0047] Figure 7 Schematic diagram of the structure of the material scraping mechanism of the present invention;

[0048] Figure 8 Top view schematic diagram of the material scraping mechanism of the present invention.

[0049] In the figure: 1. Preparation tank; 2. Installation ring; 3. Driving motor; 4. Feeding hopper; 5. Scattering mechanism; 501. Bulk material wheel disc; 502. Material leakage port; 503. Roller; 504. Central abutting rod; 505. Double-headed wedge plate; 506. Installation frame; 507. First column; 508. First spring; 509. Lifting plate; 510. Gear; 511. First conical wheel; 512. Second conical wheel; 513. Side plate; 514. Grinding strip; 515. Rack; 6. Material scraping mechanism; 601. Sector plate; 602. Single-headed wedge plate; 603. Shoveling rod; 604. Installation plate; 605. Second column; 606. Second spring; 607. Outer ring plate; 608. Inner ring plate; 609. Contact head; 610. Scraping plate; 7. Impregnation tank; 8. Stirring shaft. Detailed implementation manners

[0050] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0051] Embodiment 1:

[0052] Select alumina as the carrier material, put the carrier into an oven, set the temperature to 100 - 120 °C, and the drying time to 2 hours to ensure that there is no moisture on the surface of the carrier.

[0053] Select a platinum group metal salt (chloroplatinic acid) as the metal source, add the metal salt to deionized water, and stir evenly at 40 °C until completely dissolved to form an impregnation solution.

[0054] Add the dried carrier powder to the above impregnation solution in batches through the bulk material wheel disc to ensure that the carrier is completely wetted, and the impregnation time is 3 hours.

[0055] The impregnated carrier is taken out and placed in an oven at 120 °C for drying. The drying time is 6 hours until the surface of the carrier is completely dry. The dried catalyst sample is transferred to a high-temperature furnace. The calcination temperature is set at 500 °C, and the calcination time is 3 hours. Oxygen is used as the atmosphere during the calcination process. After the calcination is completed, it is slowly cooled to room temperature.

[0056] Please refer to Figures 1 to 8 , the present invention also provides a technical solution: including a preparation tank 1, the top of the preparation tank 1 is fixedly connected with a mounting ring 2, the top of the mounting ring 2 is fixedly connected with a driving motor 3, a feeding hopper 4 is arranged inside the mounting ring 2, a dispersing mechanism 5 and a scraping mechanism 6 are respectively arranged at the top of the preparation tank 1, an impregnation barrel 7 is arranged at the bottom of the preparation tank 1, the output end of the driving motor 3 is rotationally connected with a stirring shaft 8, and the bottom of the stirring shaft 8 is arranged inside the impregnation barrel 7;

[0057] Example two:

[0058] Please refer to Figures 2 to 6 , the dispersing mechanism 5 includes a dispersing wheel disc 501 rotatably installed at the top of the preparation tank 1. The axis of the dispersing wheel disc 501 is fixedly connected with the stirring shaft 8. The surface of the dispersing wheel disc 501 is penetrated with a material leakage opening 502. The top of the material leakage opening 502 is fixedly provided with a feeding hopper 4. The inside of the feeding hopper 4 is communicated with the material leakage opening 502. A roller 503 is rotatably arranged below the material leakage opening 502. The axis of the roller 503 is fixedly connected with a central abutting rod 504. Several double-headed wedge plates 505 are arranged around the top of the inner wall of the preparation tank 1. The two sides of the surface of the double-headed wedge plate 505 are inclined planes. The bottom of the dispersing wheel disc 501 near both sides of the material leakage opening 502 is fixedly connected with a mounting frame 506. Two first columns 507 are symmetrically arranged at the bottom of the mounting frame 506. Both of the two first columns 507 are fixedly connected with the mounting frame 506. A first spring 508 is sleeved on the first column 507;

[0059] The top of the first column 507 is slidably connected with a lifting plate 509. The lifting plate 509 is rotationally connected with both ends of the central abutting rod 504. The bottom of the lifting plate 509 is rotationally connected with a gear 510. The top of the gear 510 is fixedly connected with a first conical wheel 511. The side of the first conical wheel 511 is meshed with a second conical wheel 512. The second conical wheel 512 is fixedly connected with the central abutting rod 504;

[0060] On both sides of the bottom of the bulk material wheel 501 near the material leakage port 502, side plates 513 are fixedly installed. Several grinding bars 514 are equidistantly arranged on the inner surface of the side plates 513. The several grinding bars 514 are arranged in a triangular shape, and their function is to crush the raw materials. A rack 515 is arranged at the bottom of the double-headed wedge plate 505. The rack 515 is movably connected to the gear 510. The function of the gear 510 is to roll the raw materials during the process of spreading the raw materials. The distance between the bottom of the double-headed wedge plate 505 and the rack 515 is equal to the distance between the central abutting rod 504 and the gear 510;

[0061] In this embodiment, there are gaps between the two side plates 513 on both sides of the roller 503 and the roller 503, which is convenient for the catalyst raw materials to leak out and prevents the catalyst raw materials from being blocked due to high humidity;

[0062] Embodiment Three:

[0063] Please refer to Figures 7 to 8 , the scraping mechanism 6 includes a sector plate 601. A single-headed wedge plate 602 is fixedly connected to the bottom of the sector plate 601. One side surface of the single-headed wedge plate 602 is formed as an inclined surface. A shoveling rod 603 is fixedly connected to the bottom of the sector plate 601 near the single-headed wedge plate 602. The shoveling rod 603 is arranged in an L shape;

[0064] The scraping mechanism 6 further includes a mounting plate 604 fixedly installed on the inner wall of the preparation tank 1. Two columns 605 are symmetrically arranged on the top of the mounting plate 604. A second spring 606 is movably sleeved on the columns 605. The top of the columns 605 is slidably connected to an outer ring plate 607;

[0065] An inner ring plate 608 is arranged inside the outer ring plate 607. Both the outer ring plate 607 and the inner ring plate 608 are arranged in a sector shape, and their function is to fit the inner wall of the impregnation barrel 7 for convenient scraping operation. Contact heads 609 are fixedly connected to the opposite sides of the outer ring plate 607 and the inner ring plate 608. A scraping plate 610 is fixedly connected to the bottom of the inner ring plate 608. The bottom surface of the scraping plate 610 is in movable contact with the shoveling rod 603;

[0066] In this embodiment, the single-headed wedge plate 602 rotates counterclockwise, which is convenient for pressing down the contact head 609 to make the scraping plate 610 scrape off the materials;

[0067] The usage method and advantages of the present invention: For the preparation device and method of a wet oxidation catalyst, the working process is as follows:

[0068] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 shown:

[0069] S1: First, inject the impregnation liquid into the interior of the impregnation bucket 7, then inject the catalyst raw material into the interior of the hopper 4, and then start the drive motor 3 to make the stirring shaft 8 rotate continuously. During the rotation of the stirring shaft 8, the material scattering wheel disc 501 and the sector plate 601 are driven to rotate synchronously;

[0070] S2: When the material scattering wheel disc 501 rotates, in the initial state, the surface of the roller 503 is in contact with the bottom surface of the material scattering wheel disc 501, blocking the material leakage port 502. When following the rotation of the material scattering wheel disc 501, the central abutting rod 504 at one end of the roller 503 contacts the surface of the double-headed wedge plate 505. Through the inclined surface of the double-headed wedge plate 505, the central abutting rod 504 is pulled downward, and at the same time, the roller 503 is driven to move downward, causing the lifting plate 509 to slide downward on the two columns 507 and compressing the first spring 508. During this process, the material leakage port 502 is gradually opened, and the catalyst raw material in the hopper 4 leaks downward from the material leakage port 502. When the contact between the central abutting rod 504 and the inclined surface of the double-headed wedge plate 505 changes to contact with its bottom surface, the roller 503 moves to the low position, completely opening the material leakage port 502. At this time, the surface of the gear 510 meshes with the rack 515 below the double-headed wedge plate 505 and drives the gear 510 to rotate. When the gear 510 rotates, it drives the second conical wheel 512 to rotate through the first conical wheel 511. The second conical wheel 512 drives the central abutting rod 504 to drive the roller 503 to rotate. During rotation, the leaked catalyst raw material is driven by the rotating roller 503 to contact the grinding bar 514, and the catalyst raw material passes between the grinding bar 514 and the roller 503 and falls into the impregnation bucket 7. During this process, the agglomerated raw material is crushed;

[0071] S3: During the process of spreading the catalyst raw material, the stirring shaft 8 rotates continuously to mix the raw material and the impregnation liquid. During stirring, the sector plate 601 drives the single-headed wedge plate 602 to rotate continuously, so that when the single-headed wedge plate 602 rotates, through the inclined surface on one side thereof, it contacts the surface of the contact head 609 and presses the contact head 609 downward, causing the outer ring plate 607 to compress the second spring 606 installed on the two columns 605, moving the scraping plate 610 downward to scrape the viscous material adhering to the inner wall of the impregnation bucket 7 downward. Subsequently, the bottom surface of the single-headed wedge plate 602 contacts the surface of the contact head 609, causing the scraping plate 610 to remain stationary after scraping downward, and the shoveling rod 603 contacts the bottom surface of the scraping plate 610 to shovel the material scraped by the scraping plate 610, so that the shoveled material contacts and is mixed with the impregnation liquid, improving the impregnation effect of the catalyst raw material.

[0072] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and the above embodiments and the descriptions in the specification are only preferred examples of the present invention, which are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A preparation method of a wet oxidation catalyst, characterized in that, The wet oxidation catalyst includes a platinum catalyst supported on alumina, and the preparation method includes the following steps: S1. Dry the carrier powder to remove surface moisture; S2. Add a metal salt or metal complex to deionized water, and stir evenly at 30 - 40 °C to prepare an impregnation solution; S3. Add the carrier powder to the impregnation solution in batches; S4. After impregnation for 1 - 3 h, take out the carrier and dry it at 100 - 120 °C for 6 - 12 h; S5. Put the dried catalyst into a high-temperature furnace and calcine it for 3 - 4 h, the calcination temperature is 400 - 500 °C, and after slow cooling to room temperature, it is obtained; Among them, step S3 specifically includes the following sub-steps: S31: Place the carrier powder on the bulk material wheel disc; S32: Inject the impregnation solution into the impregnation barrel; S33: Let the carrier powder leak in batches through the material leakage port on the bulk material wheel disc; S34: The leaked carrier powder is crushed by the cooperation of the roller and the grinding bar at the bottom of the material leakage port and scattered into the impregnation barrel, and continuously stirred; S35: During the stirring process, the scraping plate scrapes off the viscous material on the inner wall of the impregnation barrel, and the shoveling rod shovels off the scraped material.

2. The preparation method of the wet oxidation catalyst according to claim 1, characterized in that, The way of adding the carrier powder to the impregnation solution is a combination of adding in batches and multi-stage impregnation. Specifically, after the carrier powder is added a certain number of times, the concentration of the impregnation solution increases by a certain amount. Among them, the relationship between the concentration of the impregnation solution and the number of additions of the carrier powder is expressed as: Among them, C0 represents the initial concentration (the concentration when the carrier is first added); is the quotient of the number of additions (n) divided by (k), indicating how many times the concentration has been adjusted; ΔC is the increase in concentration for each adjustment.

3. An apparatus for preparing a wet oxidation catalyst, characterized in that, For implementing the preparation method of the wet oxidation catalyst as described in claim 1 or 2, the preparation device of the wet oxidation catalyst includes a preparation tank (1), the top of the preparation tank (1) is fixedly connected with a mounting ring (2), the top of the mounting ring (2) is fixedly connected with a driving motor (3), a feeding hopper (4) is arranged inside the mounting ring (2), a dispersing mechanism (5) and a scraping mechanism (6) are respectively arranged at the top of the preparation tank (1), an impregnation barrel (7) is arranged at the bottom of the preparation tank (1), the output end of the driving motor (3) is rotationally connected with a stirring shaft (8), and the bottom of the stirring shaft (8) is arranged inside the impregnation barrel (7); The dispersing mechanism (5) includes a material-dispersing wheel disc (501) rotatably installed on the top of the preparation tank (1). The center of the material-dispersing wheel disc (501) is fixedly connected to the stirring shaft (8). The surface of the material-dispersing wheel disc (501) is penetrated with a material leakage port (502). A feeding hopper (4) is fixedly arranged at the top of the material leakage port (502). The inside of the feeding hopper (4) is communicated with the material leakage port (502). A roller (503) is rotatably arranged below the material leakage port (502). A central abutting rod (504) is fixedly connected to the center of the roller (503). Several double-headed wedge plates (505) are arranged around the top of the inner wall of the preparation tank (1). The two sides of the surface of the double-headed wedge plate (505) are provided as inclined surfaces. Two mounting frames (506) are fixedly connected to both sides of the bottom of the material-dispersing wheel disc (501) close to the material leakage port (502). Two first columns (507) are symmetrically arranged at the bottom of the mounting frame (506). Both of the two first columns (507) are fixedly connected to the mounting frame (506). A first spring (508) is sleeved on the first column (507). A lifting plate (509) is slidably connected to the top of the first column (507). The lifting plate (509) is rotatably connected to both ends of the central abutting rod (504). A gear (510) is rotatably connected to the bottom of the lifting plate (509). A first conical wheel (511) is fixedly connected to the top of the gear (510). A second conical wheel (512) is meshed with the side surface of the first conical wheel (511). The second conical wheel (512) is fixedly connected to the central abutting rod (504). Two side plates (513) are fixedly installed on both sides of the bottom of the material-dispersing wheel disc (501) close to the material leakage port (502). Several milling bars (514) are equidistantly arranged on the inner surface of the side plate (513). The several milling bars (514) are arranged in a triangular shape, and the function is to crush the raw materials.

4. The preparation device of a wet oxidation catalyst according to claim 3, characterized in that: A rack (515) is arranged at the bottom of the double-headed wedge plate (505). The rack (515) is movably connected to the gear (510). The function of the gear (510) is to roll and press the raw materials during the process of dispersing the raw materials.

5. The preparation device of a wet oxidation catalyst according to claim 4, characterized in that: The distance between the bottom of the double-headed wedge plate (505) and the rack (515) is equal to the distance between the central abutting rod (504) and the gear (510).

6. The preparation device of a wet oxidation catalyst according to claim 3, characterized in that: The scraping mechanism (6) includes a sector plate (601). A single-headed wedge plate (602) is fixedly connected to the bottom of the sector plate (601). One side surface of the single-headed wedge plate (602) is provided as an inclined surface.

7. The preparation device of a wet oxidation catalyst according to claim 6, characterized in that: A material shoveling rod (603) is fixedly connected to the bottom of the sector plate (601) close to the single-headed wedge plate (602). The material shoveling rod (603) is arranged in an L shape.

8. The preparation device of a wet oxidation catalyst according to claim 6, characterized in that: The scraping mechanism (6) further includes a mounting plate (604) fixedly installed on the inner wall of the preparation tank (1). Two second columns (605) are symmetrically arranged at the top of the mounting plate (604). A second spring (606) is movably sleeved on the second column (605). An outer ring plate (607) is slidably connected to the top of the second column (605).

9. The preparation device of a wet oxidation catalyst according to claim 8, characterized in that: An inner ring plate (608) is arranged on the inner side of the outer ring plate (607). Both the outer ring plate (607) and the inner ring plate (608) are fan-shaped, and their function is to fit with the inner wall of the impregnation barrel (7) to facilitate scraping operation.

10. The preparation device of a wet oxidation catalyst according to claim 9, characterized in that: Contact heads (609) are fixedly connected to the opposite sides of the outer ring plate (607) and the inner ring plate (608). A scraping plate (610) is fixedly connected to the bottom of the inner ring plate (608), and the bottom surface of the scraping plate (610) is in movable contact with the shoveling rod (603).

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