Preparation process of aluminum oxide material

Abstract

The invention belongs to the field of preparation of aluminum oxide materials, and particularly relates to a preparation process of an aluminum oxide material, which comprises the following steps: S1, raw material preparation: crushing ore raw materials through crushing equipment until the particle size is less than 20MM, then grinding and dissolving out through a ball mill, adding a concentrated caustic soda solution (with the concentration of 200-300g / L), and reacting under the conditions of high temperature (140-250 DEG C) and high pressure (3-5MPa), so as to obtain an aluminum oxide material; the alumina hydrate in the bauxite reacts with NaOH to generate soluble sodium aluminate, the soluble sodium aluminate enters the solution and the red mud and is separated, and the dissolved slurry is settled and filtered. Raw materials with unqualified particle sizes can be ground, so that the quality of finished products is improved, subsequent use is facilitated, and meanwhile, by means of a back-flushing mode, the quality of the finished products is improved. And dust on the second filter screen can fall off, continuous use of the second filter screen is facilitated, the first filter screen can be prevented from being blocked through collision between the collision frame and the first filter screen, and the discharging efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aluminum material preparation, and particularly relates to a preparation process of aluminum oxide material. BACKGROUND

[0002] The aluminum oxide material is a high-performance ceramic material with aluminum oxide as the main component, and has excellent high-temperature resistance, corrosion resistance, high hardness and good insulation performance. The aluminum oxide material has a high melting point and strong chemical stability, can resist acid and alkali corrosion, and is widely used in the fields of electronics, chemical industry, machinery and aerospace.

[0003] In the preparation of the existing aluminum oxide material, the raw materials need to be crushed by equipment. However, the existing crushing equipment has different particle sizes of the produced raw materials when in use, and the larger particles need to be processed twice, thereby reducing the processing efficiency. In view of the above problems, the present application provides a preparation process of aluminum oxide material. SUMMARY

[0004] The present application provides a preparation process of aluminum oxide material, which solves the problem of different particle sizes of the produced raw materials when the existing crushing equipment is used, and the larger particles need to be processed twice, thereby reducing the processing efficiency.

[0005] The present application provides the following technical solutions:

[0006] A preparation process of aluminum oxide material, comprising the following steps:

[0007] S1: raw material preparation, crushing the ore raw material by a crushing equipment to make the particle size less than 20MM, and then grinding by a ball mill;

[0008] S2: dissolution, adding a concentrated caustic soda solution (concentration 200-300g / L), and reacting under high temperature (140-250 DEG C) and high pressure (3-5 MPa) conditions, so that the aluminum oxide hydrate in the bauxite reacts with NaOH to generate soluble sodium aluminate into the solution and red mud;

[0009] S3: separation, performing sedimentation and filtration operations on the slurry after dissolution, separating out the coarse liquid containing sodium aluminate and the insoluble red mud, and washing the red mud for multiple times, recovering the alkali and aluminum oxide entrained therein, and then stacking for treatment;

[0010] S4: decomposition, adding fine aluminum hydroxide particles into the sodium aluminate solution, and sending into a decomposition tank, so that the aluminum aluminate solution in the decomposition tank hydrolyzes to precipitate aluminum hydroxide crystals;

[0011] S5: classification, the slurry after decomposition contains aluminum hydroxide particles and mother liquor with different particle sizes, and the aluminum hydroxide meeting the particle size requirements is separated out by a cyclone, and the qualified aluminum hydroxide slurry is filtered to separate out aluminum hydroxide filter cake;

[0012] S7: Calcination, the aluminum hydroxide filter cake is fed into a rotary kiln or fluidized bed calcination furnace and calcined at high temperature (1000-1200°C) to remove the water of crystallization and transform it into metallurgical grade alumina powder;

[0013] The crushing equipment includes a crushing box and a guide box fixedly connected to the bottom of the crushing box. A through mounting shaft is rotatably connected between the two sides of the guide box. A grinding roller is fixedly connected to the circumference of the mounting shaft. The grinding roller is eccentrically set. A first filter screen is fixedly connected between the inner walls of the two sides of the guide box. The grinding roller can swing to perform secondary processing on the large particles of raw material that fall.

[0014] Furthermore, two cooperating crushing rollers are rotatably connected between the two sides of the crushing box, with both ends of the crushing rollers rotatably penetrating the crushing box. Two geared motors are fixedly connected to one side of the crushing box, and one end of the output shaft of each of the two geared motors is fixed to the two crushing rollers respectively.

[0015] Furthermore, both sides of the crushing box are provided with a drive mechanism for driving the mounting shaft to rotate. The drive mechanism includes a drive rod, a first gear and a rotating shaft. The drive rod is fixed to one end of the mounting shaft, the first gear is fixed to one end of one of the crushing rollers, and the rotating shaft is rotatably connected to one side of the crushing box. A second gear and a drive disc are fixedly connected to the circumference of the rotating shaft. An eccentrically arranged drive shaft is fixedly connected to one side of the drive disc, and a connecting rod is rotatably connected between the drive shaft and the drive rod.

[0016] Furthermore, an exhaust pipe is fixedly connected to one side of the crushing box, a second filter screen is fixedly connected to the bottom of the exhaust pipe, and an exhaust fan is fixedly installed at the top of the exhaust pipe.

[0017] Furthermore, an air pipe is fixedly connected to one side of the crushing box, and an air inlet pipe is fixedly connected to one side of the air pipe. The air inlet pipe and the air outlet pipe are fixedly connected. A piston is slidably connected inside the air pipe. A first tension spring is fixedly connected between the piston and the inner wall of one end of the air pipe. An L-shaped drive frame is fixedly connected to one side of the piston. A push rod is fixedly connected to one side of the first gear. After the push rod rotates and contacts the drive frame, it drives the piston to move.

[0018] Furthermore, a limit ring is fixedly connected to the circumference of the drive frame to limit the reset distance of the drive frame, and a one-way air intake valve is fixedly installed at one end of the air pipe for air intake.

[0019] Furthermore, each of the mounting shafts is fixedly connected to a sleeve, and a U-shaped collision frame is slidably connected between the sleeves. A second tension spring is fixedly connected between both ends of the collision frame and the top inner wall of the sleeve. Arc-shaped guide plates are fixedly connected to both outer walls of the guide box. Multiple evenly distributed protrusions are fixed to the bottom of each guide plate. Two top rods are fixedly connected to the surface of the collision frame, located below the two guide plates respectively. Rollers are rotatably connected to the top of each top rod.

[0020] Furthermore, a guide hopper is fixedly connected to the bottom of the guide box.

[0021] Furthermore, protective plates are fixedly connected to both sides of the crushing box.

[0022] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit the invention.

[0023] In this invention, by installing a grinding roller at the bottom of the crushing chamber, the grinding roller is eccentrically positioned so that it can cooperate with the first filter screen under its swing, thereby grinding raw materials with unqualified particle size, improving the quality of the finished product, and facilitating subsequent use.

[0024] In this invention, by installing an air inlet pipe on one side of the second filter, gas can be blown onto the second filter through the air inlet pipe. Through backflushing, the dust on the second filter can fall off, making it convenient for the second filter to be used continuously.

[0025] In this invention, by installing a collision frame at the bottom of the first filter screen, the collision frame can vibrate under the action of multiple protrusions, thereby colliding with the first filter screen, preventing the first filter screen from clogging and improving the feeding efficiency.

[0026] In this invention, raw materials with unqualified particle size can be ground to improve the quality of finished products and facilitate subsequent use. At the same time, the backflushing method can make the dust on the second filter screen fall off, which can facilitate the continuous use of the second filter screen. Furthermore, the collision frame can collide with the first filter screen to prevent the first filter screen from clogging and improve the feeding efficiency. Attached Figure Description

[0027] Figure 1 This is a first-view three-dimensional structural schematic diagram of the crushing equipment in the preparation process of an alumina material provided in an embodiment of the present invention;

[0028] Figure 2 This is a second-view three-dimensional structural schematic diagram of a crushing device for an alumina material preparation process provided in an embodiment of the present invention.

[0029] Figure 3 This is a cross-sectional structural schematic diagram of a crushing device for the preparation process of alumina material provided in an embodiment of the present invention;

[0030] Figure 4 This is an enlarged structural diagram of part A of a crushing device for the preparation process of alumina material provided in an embodiment of the present invention.

[0031] Figure 5 This is a partial structural schematic diagram of a crushing device for the preparation process of alumina material provided in an embodiment of the present invention;

[0032] Figure 6 This is an enlarged structural diagram of part B of a crushing device for an alumina material preparation process provided in an embodiment of the present invention.

[0033] Figure 7 This is a schematic diagram of the preparation process of an alumina material provided in an embodiment of the present invention.

[0034] Figure label:

[0035] 1. Crushing box; 2. Guide box; 3. Guard plate; 4. Gear motor; 5. Guide hopper; 6. Crushing roller; 7. Exhaust pipe; 8. Second filter screen; 9. Air inlet pipe; 10. First filter screen; 11. Mounting shaft; 12. Grinding roller; 13. Drive rod; 14. First gear; 15. Rotating shaft; 16. Drive disc; 17. Second gear; 18. Drive shaft; 19. Connecting rod; 20. Push rod; 21. Air pipe; 22. Piston; 23. Drive frame; 24. First tension spring; 25. Sleeve; 26. Collision frame; 27. Second tension spring; 28. Top rod; 29. ​​Guide plate; 30. Convex strip; 31. Exhaust fan. Detailed Implementation

[0036] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0037] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "installation" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Furthermore, "connection" can be a direct connection or an indirect connection through an intermediate medium. "Fixed" means that the devices are connected to each other and their relative positional relationship remains unchanged after the connection. The directional terms mentioned in the embodiments of the present invention, such as "inner," "outer," "top," and "bottom," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0038] References to "one embodiment" or "some embodiments" as used in this specification mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of the invention. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless otherwise specifically emphasized.

[0039] Example 1

[0040] Reference Figures 1-7 A process for preparing an alumina material includes the following steps:

[0041] S1: Raw material preparation: The ore raw material is crushed by crushing equipment to make its particle size less than 20MM, and then ground by ball mill.

[0042] S2: Dissolution, add concentrated caustic soda solution (concentration 200g / L), and react under high temperature (140℃) and high pressure (3MPa) conditions. The alumina hydrate in bauxite reacts with NaOH to generate soluble sodium aluminate, which enters the solution and red mud.

[0043] S3: Separation. The dissolved slurry is subjected to sedimentation and filtration to separate the crude liquid containing sodium aluminate and the insoluble red mud. The red mud is washed multiple times to recover the alkali and alumina it carries before being stockpiled.

[0044] S4: Decomposition. Fine aluminum hydroxide particles are added to a sodium aluminate solution and sent to a decomposition tank. The sodium aluminate solution undergoes a hydrolysis reaction, precipitating aluminum hydroxide crystals.

[0045] S5: Grading. The decomposed slurry contains aluminum hydroxide particles and mother liquor of different sizes. The aluminum hydroxide that meets the particle size requirements is separated by a hydrocyclone. The qualified aluminum hydroxide slurry is filtered to separate the aluminum hydroxide filter cake.

[0046] S7: Calcination. The aluminum hydroxide filter cake is fed into a rotary kiln or fluidized bed calcination furnace and calcined at a high temperature (1000℃) to remove the water of crystallization and transform it into metallurgical grade alumina powder.

[0047] Example 2

[0048] Reference Figures 1-7 An improved preparation process for alumina material, based on Example 1, includes the following steps:

[0049] S1: Raw material preparation: The ore raw material is crushed by crushing equipment to make its particle size less than 20MM, and then ground by ball mill.

[0050] S2: Dissolution, add concentrated caustic soda solution (concentration 300g / L), and react under high temperature (250℃) and high pressure (5MPa) conditions. The alumina hydrate in bauxite reacts with NaOH to generate soluble sodium aluminate, which enters the solution and red mud.

[0051] S3: Separation. The dissolved slurry is subjected to sedimentation and filtration to separate the crude liquid containing sodium aluminate and the insoluble red mud. The red mud is washed multiple times to recover the alkali and alumina it carries before being stockpiled.

[0052] S4: Decomposition. Fine aluminum hydroxide particles are added to a sodium aluminate solution and sent to a decomposition tank. The sodium aluminate solution undergoes a hydrolysis reaction, precipitating aluminum hydroxide crystals.

[0053] S5: Grading. The decomposed slurry contains aluminum hydroxide particles and mother liquor of different sizes. The aluminum hydroxide that meets the particle size requirements is separated by a hydrocyclone. The qualified aluminum hydroxide slurry is filtered to separate the aluminum hydroxide filter cake.

[0054] S7: Calcination, the aluminum hydroxide filter cake is fed into a rotary kiln or fluidized bed calcination furnace and calcined at a high temperature (1200℃) to remove the water of crystallization and transform it into metallurgical grade alumina powder;

[0055] The crushing equipment includes a crushing box 1 and a guide box 2 fixedly connected to the bottom of the crushing box 1. A through mounting shaft 11 is rotatably connected between the two sides of the guide box 2. A grinding roller 12 is fixedly connected to the circumference of the mounting shaft 11. The grinding roller 12 is eccentrically set. A first filter screen 10 is fixedly connected between the inner walls of the two sides of the guide box 2. The grinding roller 12 can swing to perform secondary processing on the falling large particles of raw material. The eccentric setting of the grinding roller 12 allows it to grind raw materials with unqualified particle size when it swings, thereby improving the quality of the finished product and facilitating subsequent use.

[0056] In this invention, two cooperating crushing rollers 6 are rotatably connected between the two sides of the crushing box 1. Both ends of the crushing rollers 6 rotatably penetrate the crushing box 1. Two reduction motors 4 are fixedly connected to one side of the crushing box 1. One end of the output shaft of the two reduction motors 4 is fixed to the two crushing rollers 6 respectively. When the reduction motors 4 are started, the reduction motors 4 drive the crushing rollers 6 to rotate, thereby crushing the raw materials.

[0057] In this invention, both sides of the crushing box 1 are provided with driving mechanisms for driving the mounting shaft 11 to rotate. The driving mechanism includes a driving rod 13, a first gear 14, and a rotating shaft 15. The driving rod 13 is fixed to one end of the mounting shaft 11, the first gear 14 is fixed to one end of one of the crushing rollers 6, and the rotating shaft 15 is rotatably connected to one side of the crushing box 1. A second gear 17 and a driving disk 16 are fixedly connected to the circumference of the rotating shaft 15. The first gear 14 and the second gear 17 mesh. An eccentrically mounted driving shaft 18 is fixedly connected to one side of the driving disk 16. A connecting rod 19 is rotatably connected between the driving shaft 18 and the driving rod 13. When the crushing roller 6 rotates, the first gear 14 and the second gear 17 also drive the driving disk 16 to rotate. The driving disk 16 drives the eccentrically mounted driving shaft 18 to rotate. The driving shaft 18 pushes the mounting shaft 11 to rotate reciprocally through the connecting rod 19, thereby driving the grinding roller 12 to swing.

[0058] In this invention, an exhaust pipe 7 is fixedly connected to one side of the crushing box 1, a second filter screen 8 is fixedly connected to the bottom of the exhaust pipe 7, and an exhaust fan 31 is fixedly installed on the top of the exhaust pipe 7. When the exhaust fan 31 is started, a negative pressure is formed in the crushing box 1 and the feed box 2, so that the dust generated during crushing can be filtered by the second filter screen 8, thereby improving the quality of the on-site environment.

[0059] In this invention, an air pipe 21 is fixedly connected to one side of the crushing box 1, and an air inlet pipe 9 is fixedly connected to one side of the air pipe 21. The air inlet pipe 9 is fixedly connected to the exhaust pipe 7. A piston 22 is slidably connected inside the air pipe 21. A first tension spring 24 is fixedly connected between the piston 22 and the inner wall of one end of the air pipe 21. An L-shaped drive frame 23 is fixedly connected to one side of the piston 22. A push rod 20 is fixedly connected to one side of the first gear 14. After the push rod 20 rotates and contacts the drive frame 23, it drives the piston 22 to move. When the push rod 20 rotates and contacts the L-shaped drive frame 23, it pushes it to move, thereby driving the piston 22 to move. When the push rod 20 disengages from the drive frame 23, the piston 22 returns to its original position under the action of the first tension spring 24. Then, the gas is blown towards the second filter screen 8. Through the backflow, the dust on the second filter screen 8 can fall off, making it convenient for the second filter screen 8 to be used continuously.

[0060] In this invention, a limiting ring is fixedly connected to the circumference of the drive frame 23 to limit the reset distance of the drive frame 23, so that it can be pushed again. One end of the air pipe 21 is fixedly installed with a one-way air intake valve for air intake.

[0061] In this invention, sleeves 25 are fixedly connected to the bottom of the mounting shaft 11, and U-shaped collision frames 26 are slidably connected between the sleeves 25. Second tension springs 27 are fixedly connected between the two ends of the collision frame 26 and the top inner wall of the sleeve 25. Arc-shaped guide plates 29 are fixedly connected to the outer walls of both sides of the guide box 2. Multiple evenly distributed protrusions 30 are fixedly fixed to the bottom of the guide plates 29. Two top rods 28 are fixedly connected to the surface of the collision frame 26, respectively located below the two guide plates 29. When the mounting shaft 11 swings, the collision frame 26 can be moved by the sleeves 25. The collision frame 26 drives the top rods 28 to move along the guide plates 29. Under the action of the multiple protrusions 30, the collision frame 26 vibrates, thereby colliding with the first filter screen 10, preventing the first filter screen 10 from clogging and improving the feeding efficiency. Rollers are rotatably connected to the top of the top rods 28.

[0062] In this invention, a guide hopper 5 is fixedly connected to the bottom of the guide box 2. The bottom of the guide hopper 5 is inclined to facilitate material unloading.

[0063] In this invention, protective plates 3 are fixedly connected to both sides of the crushing box 1.

[0064] Those skilled in the art should understand that the selection and circuit connection of the geared motor 4 and the exhaust fan 31 are conventional techniques in the field. Their specific parameter configurations (including but not limited to power matching, speed regulation, and protection device settings) can be implemented by those skilled in the art through conventional technical solutions according to the actual application scenario requirements, and the implementation details will not be elaborated here.

[0065] The working principle and usage process of this technical solution are as follows: When in use, start the reduction motor 4 and exhaust fan 31, put the raw material into the crushing box 1, the reduction motor 4 drives the crushing roller 6 to rotate, and then crushes the raw material. The crushed raw material falls onto the first filter screen 10, and qualified raw material falls through the first filter screen 10. When the crushing roller 6 rotates, it also drives the drive disk 16 to rotate through the first gear 14 and the second gear 17. The drive disk 16 drives the eccentrically mounted drive shaft 18 to rotate. The drive shaft 18 pushes the mounting shaft 11 to rotate through the connecting rod 19, and then drives the grinding roller 12 to swing. Because the grinding roller 12 is eccentrically set, it can grind raw materials with unqualified particle size, improve the quality of finished products, and facilitate subsequent use.

[0066] When the exhaust fan 31 starts, it creates a negative pressure in the crushing box 1 and the guide box 2, so that the dust generated during crushing can be filtered by the second filter screen 8, improving the quality of the on-site environment. At the same time, when the first gear 14 rotates, it also drives the push rod 20 to rotate. When the push rod 20 contacts the L-shaped drive frame 23, it pushes it to move, which in turn drives the piston 22 to move. When the push rod 20 disengages from the drive frame 23, the piston 22 returns to its original position under the action of the first tension spring 24, and then the gas is blown towards the second filter screen 8. Through the backflow, the dust on the second filter screen 8 can fall off, making it convenient for the second filter screen 8 to be used continuously.

[0067] When the mounting shaft 11 swings, it can drive the collision frame 26 to move through the sleeve 25. The collision frame 26 drives the top rod 28 to move along the guide plate 29. Under the action of multiple protrusions 30, the collision frame 26 vibrates and then collides with the first filter screen 10 to prevent the first filter screen 10 from clogging and improve the feeding efficiency.

[0068] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. In the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A process for preparing alumina material, characterized in that, Includes the following steps: S1: Raw material preparation: The ore raw material is crushed by crushing equipment to make its particle size less than 20MM, and then ground by ball mill. S2: Dissolution, add concentrated caustic soda solution (concentration 200-300g / L), and react under high temperature (140-250℃) and high pressure (3-5MPa) conditions. The alumina hydrate in bauxite reacts with NaOH to generate soluble sodium aluminate, which enters the solution and red mud. S3: Separation. The dissolved slurry is subjected to sedimentation and filtration to separate the crude liquid containing sodium aluminate and the insoluble red mud. The red mud is washed multiple times to recover the alkali and alumina it carries before being stockpiled. S4: Decomposition. Fine aluminum hydroxide particles are added to a sodium aluminate solution and sent to a decomposition tank. The sodium aluminate solution undergoes a hydrolysis reaction, precipitating aluminum hydroxide crystals. S5: Grading. The decomposed slurry contains aluminum hydroxide particles and mother liquor of different sizes. The aluminum hydroxide that meets the particle size requirements is separated by a hydrocyclone. The qualified aluminum hydroxide slurry is filtered to separate the aluminum hydroxide filter cake. S7: Calcination, the aluminum hydroxide filter cake is fed into a rotary kiln or fluidized bed calcination furnace and calcined at high temperature (1000-1200°C) to remove the water of crystallization and transform it into metallurgical grade alumina powder; The crushing equipment includes a crushing box (1) and a guide box (2) fixedly connected to the bottom of the crushing box (1). A through mounting shaft (11) is rotatably connected between the two sides of the guide box (2). A grinding roller (12) is fixedly connected to the circumference of the mounting shaft (11). The grinding roller (12) is eccentrically set. A first filter screen (10) is fixedly connected between the inner walls of the two sides of the guide box (2). The grinding roller (12) can swing to perform secondary processing on the large particles of raw material that fall.

2. The preparation process of an alumina material according to claim 1, characterized in that, Two crushing rollers (6) are rotatably connected between the two sides of the crushing box (1). Both ends of the crushing rollers (6) rotatably pass through the crushing box (1). Two reduction motors (4) are fixedly connected to one side of the crushing box (1). One end of the output shaft of the two reduction motors (4) is fixed to the two crushing rollers (6) respectively.

3. The preparation process of an alumina material according to claim 2, characterized in that, Both sides of the crushing box (1) are provided with driving mechanisms for driving the mounting shaft (11) to rotate. The driving mechanism includes a driving rod (13), a first gear (14) and a rotating shaft (15). The driving rod (13) is fixed to one end of the mounting shaft (11), the first gear (14) is fixed to one end of one of the crushing rollers (6), and the rotating shaft (15) is rotatably connected to one side of the crushing box (1). The circumference of the rotating shaft (15) is fixedly connected to a second gear (17) and a driving disk (16). One side of the driving disk (16) is fixedly connected to an eccentrically arranged driving shaft (18), and a connecting rod (19) is rotatably connected between the driving shaft (18) and the driving rod (13).

4. The preparation process of an alumina material according to claim 3, characterized in that, One side of the crushing box (1) is fixedly connected to an exhaust pipe (7), the bottom of the exhaust pipe (7) is fixedly connected to a second filter screen (8), and the top of the exhaust pipe (7) is fixedly installed with an exhaust fan (31).

5. The preparation process of an alumina material according to claim 4, characterized in that, A gas pipe (21) is fixedly connected to one side of the crushing box (1), and an air inlet pipe (9) is fixedly connected to one side of the gas pipe (21). The air inlet pipe (9) is fixedly connected to the exhaust pipe (7). A piston (22) is slidably connected inside the gas pipe (21). A first tension spring (24) is fixedly connected between the piston (22) and the inner wall of one end of the gas pipe (21). An L-shaped drive frame (23) is fixedly connected to one side of the piston (22). A push rod (20) is fixedly connected to one side of the first gear (14). After the push rod (20) rotates and contacts the drive frame (23), it drives the piston (22) to move.

6. The preparation process of an alumina material according to claim 5, characterized in that, The drive frame (23) is fixedly connected to a limiting ring to limit the reset distance of the drive frame (23), and a one-way air intake valve is fixedly installed at one end of the air pipe (21) for air intake.

7. The preparation process of an alumina material according to claim 1, characterized in that, The bottom of each mounting shaft (11) is fixedly connected to a sleeve (25), and a U-shaped collision frame (26) is slidably connected between the sleeves (25). A second tension spring (27) is fixedly connected between the two ends of the collision frame (26) and the top inner wall of the sleeve (25). Arc-shaped guide plates (29) are fixedly connected to the outer walls of both sides of the guide box (2). Multiple evenly distributed protrusions (30) are fixedly fixed to the bottom of the guide plates (29). Two top rods (28) are fixedly connected to the surface of the collision frame (26) and are located below the two guide plates (29). Rollers are rotatably connected to the top of each top rod (28).

8. The preparation process of an alumina material according to claim 1, characterized in that, The bottom of the guide box (2) is fixedly connected to the guide hopper (5).

9. The preparation process of an alumina material according to claim 1, characterized in that, Both sides of the crushing box (1) are fixedly connected with guard plates (3).

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