An apparatus for pretreating an alumina feedstock

Abstract

The utility model relates to preprocessing device technical field, specifically disclose a kind of alumina raw material preprocessing device, including cleaning mechanism, the upper of cleaning mechanism is provided with stirring mechanism, the side of cleaning mechanism is provided with discharging mechanism.The scheme realizes the efficient cleaning and impurity separation of alumina raw material by the synergistic effect of cleaning mechanism and stirring mechanism, the material cylinder in cleaning pool is designed as detachable structure, the bottom of cylinder is equipped with built-in hole, not only can allow washing liquid to flow, but also can effectively isolate alumina particle, ensure that small impurities are fully removed in the cleaning process, the stirring blade and scraping strip of stirring mechanism are driven under motor, not only strengthen the contact effect of solution and raw material, but also avoid the blockage of built-in hole, significantly improve the cleaning efficiency, in addition, the cooperation use of waste pump and valve makes waste liquid can be discharged quickly, further optimizes the cleaning process.

Description

Technical Field

[0001] This utility model relates to the technical field of pretreatment devices, and specifically discloses an alumina raw material pretreatment device. Background Technology

[0002] Pretreatment of alumina raw materials is an important step in the production of high-quality alumina, as it directly affects the purity and performance of the final product. Alumina raw materials typically include bauxite, waste aluminum, and aluminum ash. Before entering the pretreatment stage, the raw materials need to be crushed and ground to reduce particle size and increase specific surface area.

[0003] One of the important steps in the pretreatment of alumina raw materials is cleaning and impurity removal. Impurities in the raw materials are removed through methods such as water washing, acid washing, and alkaline washing. For example, the utility model patent with authorization announcement number CN218360961U discloses a clean batching system for alumina processing, including a base plate. A first support rod is fixedly installed on the top of the base plate, a feed pipe is fixedly installed on the top of the first support rod, a circulation tank is fixedly installed on the top of the base plate, a material box is fixedly installed on the top of the base plate, a second support rod is fixedly installed on the top of the circulation tank, and a cleaning structure is fixedly installed on the top of the circulation tank. This clean batching system for alumina processing, through the base plate which provides support and fixation, the first support rod which supports the feed pipe and provides a channel for the raw materials to enter, the circulation tank which circulates and stores the cleaning solution, the material box which holds the cleaned alumina particles, the second support rod which supports the cleaning nozzle, and the cleaning structure which enables continuous cleaning of alumina particles, thus improving alumina production efficiency. Currently, during the pretreatment of alumina raw materials, after crushing and grinding, alumina raw material particles are formed. In order to remove impurities such as iron, silicon, and calcium, they need to be cleaned. First, acid washing and alkali washing are performed, and finally, they are washed with clean water. During the cleaning process, conventional cleaning tanks mainly rely on static soaking, which greatly reduces the uniformity of contact between the alumina raw material particles and the cleaning solution. At the same time, if the cleaning volume is large, it is necessary to manually remove the material bit by bit during discharge, which is relatively cumbersome and greatly reduces work efficiency. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide an alumina raw material pretreatment device to solve the problems of improving the uniformity of contact between the alumina raw material and the cleaning agent during cleaning, and the problem of concentrated material discharge during discharge.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an alumina raw material pretreatment device, including a cleaning mechanism, a stirring mechanism above the cleaning mechanism, and a feeding mechanism on one side of the cleaning mechanism.

[0006] Furthermore, the cleaning mechanism includes a base, which is rectangular in structure. A base platform is provided below the base, and a cleaning tank is provided above the base. A material cylinder is provided inside the cleaning tank, and a cylinder bottom is provided at the bottom of the material cylinder. Several internal holes are opened on the surface of the cylinder bottom.

[0007] Several internal sleeves are distributed throughout the bottom surface of the cylinder. A threaded post is provided at the connection end face between the cylinder and the bottom of the cylinder. The threaded post is installed through the internal sleeve. The threaded post is threaded and connected to the threaded sleeve. The end face of the threaded sleeve is fitted with the end face of the internal sleeve.

[0008] Furthermore, a waste discharge port is provided through one side of the cleaning tank, and a valve is provided on the surface of the waste discharge port. The valve core is embedded inside the waste discharge port. A waste discharge pump is provided at the end of the base near the waste discharge port, and the feed end of the waste discharge pump is connected to the flange at the end of the waste discharge port away from the cleaning tank.

[0009] Furthermore, the stirring mechanism includes a guide rail sub-guide rail, which is set at the upper end of the base and symmetrically distributed along both sides of the washing tank. Anti-detachment blocks are provided at both ends of the guide rail sub-guide rails distributed along one side, and guide rail sub-slide seats are slidably provided on the surface of the guide rail sub-guide rail.

[0010] A cylinder is installed at the upper end of the guide rail slide. Inside the cylinder is a piston rod for extension and retraction. At the end of the piston rod is a mounting bracket one. The lower end of mounting bracket one is fixedly installed at the port of the material cylinder by screws. Mounting plates are installed at the upper ends of mounting bracket one distributed on both sides. Mounting bracket two is symmetrically distributed on the mounting plates perpendicular to the direction of mounting bracket one. The lower end of mounting bracket two is fixedly installed at the port of the material cylinder by screws.

[0011] Furthermore, a bushing is provided through the center of the mounting plate, and a stirring shaft is rotatably installed inside the bushing. A motor is installed at the upper end of the stirring shaft. The outer wall of the motor is fixed to the surface of the mounting plate by a bracket. A drive shaft is installed inside the motor. The end of the drive shaft is fixedly connected to the end of the stirring shaft by a coupling. Several stirring blades are fixedly distributed on the surface of the stirring shaft, and several scrapers are provided at the lower end of the stirring shaft.

[0012] Furthermore, the feeding mechanism includes a ramp, the bottom of which is set on the surface of the base, and two symmetrically arranged pillars are fixed at the lower end of the ramp top. The lower ends of the pillars are supported on the surface of the base. Several filter holes penetrating the interior are opened on the ramp surface. Baffles are provided on both sides of the ramp surface. The base is located directly below the ramp and has a waste hole penetrating the interior.

[0013] Furthermore, a bearing is installed through the baffle at the top of the ramp. The bearings distributed on both sides have the same threaded rod installed through them. The threaded rod is interference-fitted with the inner ring wall of the bearing. A second motor is installed at the outer end of the threaded rod. The outer wall of the second motor is fixed to the surface of the baffle by a bracket. A second rotating shaft for driving is installed inside the second motor. The end of the second rotating shaft near the threaded rod is fixedly connected to the end of the threaded rod by a coupling. A pusher plate is installed on the surface of the threaded rod.

[0014] Furthermore, a limiting rod is fixedly installed at the lower end of the baffles distributed on both sides, and a limiting sleeve is provided through the bottom end of the pusher plate at the bottom of the ramp. The inside of the limiting sleeve is slidably sleeved with the surface of the limiting rod.

[0015] The working principle and beneficial effects of this solution are as follows: 1. This solution achieves efficient cleaning and impurity separation of alumina raw materials through the synergistic effect of the cleaning mechanism and the stirring mechanism. The material cylinder in the cleaning tank is designed as a detachable structure with an internal hole at the bottom, which allows the cleaning liquid to flow while effectively isolating alumina particles, ensuring that fine impurities are fully removed during the cleaning process.

[0016] 2. As described in 1, the stirring blades and scrapers of the stirring mechanism, driven by the motor, not only enhance the contact effect between the solution and the raw materials, but also avoid the clogging of the built-in holes, significantly improving the cleaning efficiency. In addition, the combined use of the waste pump and valves enables the waste liquid to be discharged quickly, further optimizing the cleaning process.

[0017] 3. As described in section 2, the feeding mechanism achieves automated feeding and draining of alumina raw materials through the ingenious design of ramps, filter holes, and pusher plates. The material cylinder can be easily moved out of the washing tank and onto the ramp through the cooperation of cylinders and guide rail slides to complete the draining operation. The detachable connection between the cylinder bottom and the material cylinder (threaded column and threaded sleeve) makes the feeding process more convenient. The filter holes on the ramp can screen out fine impurities and assist in draining. The pusher plate driven by the motor ensures smooth feeding of raw materials and avoids accumulation through the cooperation of threaded rods and limit rods.

[0018] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0019] Figure 1 This is a schematic diagram showing the distribution of the various mechanisms in the embodiment;

[0020] Figure 2 This is a schematic diagram of the overall structure of the embodiment;

[0021] Figure 3 This is a schematic diagram of the internal structure of the cleaning tank in an embodiment;

[0022] Figure 4 This is an enlarged schematic diagram of point A in the embodiment;

[0023] Figure 5 This is a top view schematic diagram of the cleaning tank and mounting brackets one and two as shown in the embodiment.

[0024] Figure 6 This is a schematic diagram showing the location distribution of the ramp and waste discharge hole in an embodiment.

[0025] The following are labeled in the attached diagram: 1. Cleaning mechanism; 2. Mixing mechanism; 3. Feeding mechanism; 10. Base; 11. Base platform; 12. Cleaning tank; 13. Material cylinder; 14. Cylinder bottom; 15. Internal hole; 16. Internal sleeve; 17. Threaded column; 18. Threaded sleeve; 1001. Waste discharge port; 1002. Valve; 1003. Waste discharge pump; 20. Guide rail pair guide rail; 21. Anti-detachment block; 22. Guide rail pair slide; 23. Cylinder; 24. Mounting bracket 1. Mounting plate; 25. Mounting bracket 2; 2001. Shaft sleeve; 2002. Stirring shaft; 2003. Motor 1; 2004. Stirring blade; 2005. Scraper; 30. Ramp; 31. Support column; 32. Filter hole; 33. Baffle; 34. Waste hole; 3001. Bearing; 3002. Threaded rod; 3003. Motor 2; 3004. Threaded ring; 3005. Push plate; 3006. Limiting sleeve; 3007. Limiting rod. Detailed Implementation

[0026] The following detailed description illustrates the specific implementation methods:

[0027] Example

[0028] like Figures 1 to 6 As shown, an alumina raw material pretreatment device is disclosed, including a cleaning mechanism 1, a stirring mechanism 2 is arranged above the cleaning mechanism 1, and a feeding mechanism 3 is arranged on one side of the cleaning mechanism 1.

[0029] The cleaning mechanism 1 includes a base 10, which is rectangular in structure. A base platform 11 is located below the base 10, and the upper end of the base platform 11 is fixed to the base 10 with screws. The base platforms 11 are symmetrically distributed along both sides of the base 10, elevating the base 10 to facilitate cleaning of materials leaking from the waste hole 34. A cleaning tank 12 is located above the base 10, and is circular in structure. The lower end of the cleaning tank 12 is fixed to the surface of the base 10 with screws. A material cylinder 13 is located inside the cleaning tank 12, and the outer wall of the material cylinder 13... The material cylinder 13 is slidably fitted against the inner wall of the cleaning tank 12. A cylinder bottom 14 is provided at the bottom of the cylinder 13. The cylinder bottom 14 and the material cylinder 13 are detachable. When fixed, they can be used to hold alumina raw material particles for cleaning. When the material cylinder 13 is removed from the cleaning tank 12, the cylinder bottom 14 can be removed for easy overall discharge. Several internal holes 15 are provided on the surface of the cylinder bottom 14. These holes allow the cleaning liquid to flow normally and contact the alumina raw material particles after the cylinder bottom 14 is submerged in the cleaning tank 12. The internal holes 15 are non-standard sizes; the specifications shown in the figure are as follows. For illustrative purposes only, the internal hole 15 isolates alumina raw material particles inside the barrel 13, allowing only fine impurities and solution to pass through. Several internal sleeves 16 are distributed throughout the surface of the barrel bottom 14, and the internal sleeves 16 are welded to the barrel bottom 14. A threaded post 17 is provided on the connecting end face of the barrel 13 and the barrel bottom 14, penetrating the internal sleeve 16. The end of the threaded post 17 closest to the barrel 13 is welded to the end face of the barrel 13. A threaded sleeve 18 is connected to the threaded post 17, and the end face of the threaded sleeve 18 is in contact with the end face of the internal sleeve 16. The threaded sleeve 18 has several knobs distributed on its outer ring wall. One end of each knob is welded to the surface of the threaded sleeve 18. The knobs are distributed equidistantly in a ring along the outer wall of the threaded sleeve 18. When it is necessary to install the bottom of the cylinder 14 and the bottom of the material cylinder 13, the bottom of the cylinder 14 and the bottom of the material cylinder 13 are first fitted together. At this time, the threaded post 17 is positioned through the inner sleeve 16. Then, the threaded sleeve 18 and the threaded post 17 are threaded together and the end face of the threaded sleeve 18 is fitted together to lock the connection between the bottom of the cylinder 14 and the material cylinder 13.

[0030] A waste discharge port 1001 is provided through one side of the cleaning tank 12. The connection between the waste discharge port 1001 and the cleaning tank 12 is fixed by welding. A valve 1002 is provided on the surface of the waste discharge port 1001. The valve core of the valve 1002 is embedded in the interior of the waste discharge port 1001. A waste discharge pump 1003 is provided at one end of the base 10 near the waste discharge port 1001. The lower end of the waste discharge pump 1003 is fixedly installed on the surface of the base 10 by a bracket. The feed end of the waste discharge pump 1003 is connected to the flange at the end of the waste discharge port 1001 away from the cleaning tank 12. After the alumina raw material particles are acid-washed, alkaline-washed, or washed with clean water, the power supply of the waste discharge pump 1003 is turned on and the valve 1002 is opened so that the waste liquid in the cleaning tank 12 can be discharged through the waste discharge port 1001.

[0031] The stirring mechanism 2 includes a secondary guide rail 20, which is disposed on the upper end of the base 10 and symmetrically distributed along both sides of the washing tank 12. The lower end of the secondary guide rail 20 is fixed to the surface of the base 10 by screws. Anti-detachment blocks 21 are provided at both ends of the secondary guide rail 20 distributed along one side. The anti-detachment blocks 21 are assembled and fixed to the secondary guide rail 20 by screws. A secondary guide rail slide 22 is slidably disposed on the surface of the secondary guide rail 20, and a cylinder 23 is disposed at the upper end of the secondary guide rail slide 22. The lower end of cylinder 23 is slidably mounted on the surface of guide rail pair slide 22 via screws. Guide rail pair slide 22 and guide rail pair 20 form a linear guide rail pair structure. A piston rod for extension and retraction is installed inside cylinder 23. A mounting bracket 24 is installed at the end of the piston rod. The connection between mounting bracket 24 and piston rod is fixed with screws. Mounting bracket 24 is a right-angle bent structure with its lower end pointing vertically downwards. The lower end of mounting bracket 24 is fixedly mounted at the port of material cylinder 13 with screws. (The last part, "distributed along both sides...", appears to be an unrelated fragment and is omitted from the translation.) Mounting bracket 1 24 has a mounting plate 25 at its upper end. Both ends of the mounting plate 25 are fixed to the corresponding mounting bracket 1 24 with screws. Mounting bracket 26 is symmetrically distributed on the mounting plate 25 perpendicular to the mounting bracket 1 24. One end of mounting bracket 26 is fixed to the surface of the mounting plate 25 with screws. Mounting bracket 26 has a bent structure with its lower end pointing vertically downwards. The lower end of mounting bracket 26 is screwed and fixed to the port of the material cylinder 13. The mounting bracket 1 24 and mounting bracket 26 work together... This allows the material cylinder 13 to be positioned deep within the cleaning tank 12. The piston rod of the cylinder 23 extends and retracts, facilitating the adjustment of the height of the material cylinder 13 within the cleaning tank 12. When the piston rod of the cylinder 23 rises to its maximum position, the material cylinder 13 can be completely removed from the cleaning tank 12, connecting to the bottom 14, and can then be drained. Simultaneously, in conjunction with the guide rail auxiliary slide 22 sliding on the guide rail auxiliary guide rail 20, the material cylinder 13 and the cleaned alumina raw material particles inside it can be horizontally transferred.

[0032] A bushing 2001 is installed through the center of the mounting plate 25. The bushing 2001 is fixed to the mounting plate 25 with screws. A stirring shaft 2002 is rotatably mounted inside the bushing 2001. A motor 2003 is installed at the upper end of the stirring shaft 2002. The outer wall of the motor 2003 is fixed to the surface of the mounting plate 25 by a bracket. A drive shaft is installed inside the motor 2003. The end of the drive shaft is fixedly connected to the end of the stirring shaft 2002 by a coupling. Several stirring blades 2004 are fixedly distributed on the surface of the stirring shaft 2002. One end of each stirring blade 2004 is fixed to the surface of the stirring shaft 2002 with screws. The stirring blades 2004 can agitate the solution and alumina raw material particles during cleaning, thereby improving the contact between the alumina raw material particles and the solution. In effect, the lower end of the stirring shaft 2002 is provided with several scraper strips 2005. One end of the scraper strip 2005 is fixed to the surface of the stirring shaft 2002 by screws. The lower end face of the scraper strip 2005 is attached to the upper end face of the bottom of the cylinder 14. When acid washing, alkali washing, and water washing and soaking of alumina raw material particles are required, in order to improve the contact effect between the alumina raw material particles and the solution, the power supply of motor 2003 is turned on so that the rotating shaft 1 can be driven. Thus, the rotating shaft 1 can drive the stirring shaft 2002 to rotate, thereby driving the stirring blades 2004 to stir the solution and alumina raw material particles. Simultaneously, the stirring shaft 2002 can drive the scraper strips 2005 to rotate, which can clean the surface of the bottom of the cylinder 14 and prevent impurities or alumina raw material particles from clogging the internal hole 15 and affecting the flow of the solution.

[0033] The feeding mechanism 3 includes a ramp 30. The bottom of the ramp 30 is located on the surface of the base 10 and is fixed to the upper end of the base 10 with screws. Two symmetrically arranged support columns 31 are fixed at the lower end of the top of the ramp 30. The lower ends of the support columns 31 are supported on the surface of the base 10 and fixed with screws. Several filter holes 32 penetrating through the ramp 30 are opened on the ramp surface. Baffles 33 are provided on both sides of the ramp surface. The lower ends of the baffles 33 are fixed to the side walls of the ramp 30 with screws. The base 10 is located directly below the ramp 30 and has a waste hole 34 penetrating through it. When the material cylinder 13 carries the cleaned alumina raw material particles out of the cleaning tank 12, it first passes through the cleaning tank 12. The material cylinder 13 is moved to the position of the ramp 30 by sliding the guide rail slide 22 on the guide rail 20, so that the ramp surface and the bottom of the cylinder 14 are aligned. By rotating the knob, the threaded sleeve 18 and the threaded column 17 are separated from each other, and the threaded column 17 is separated from the inner sleeve 16. Thus, the bottom of the cylinder 14 and the material cylinder 13 are separated. After separation, the alumina raw material particles pour down and fall on the ramp surface of the ramp 30. Through the filter hole 32, fine impurities can be screened and drainage can be assisted. The filter hole 32 is a non-standard size and can be opened according to the actual situation to avoid leakage of qualified alumina raw material particles.

[0034] A bearing 3001 is installed through the baffle 33 at the top of the ramp 30. The bearing 3001 is fixed to the baffle 33 by screws. A threaded rod 3002 is installed through the bearings 3001 distributed on both sides. The threaded rod 3002 is interference-fitted with the inner ring wall of the bearing 3001. A second motor 3003 is installed at the outer end of the threaded rod 3002. The outer wall of the second motor 3003 is fixed to the surface of the baffle 33 by a bracket. A second rotating shaft for driving is installed inside the second motor 3003, and the second rotating shaft is close to the threaded rod. One end of 3002 is fixedly connected to the end of the threaded rod 3002 via a coupling. The surface of the threaded rod 3002 is provided with a pusher plate 3005. The pusher plate 3005 can slide on the slope of the ramp 30 to push the alumina raw material particles that have stopped falling, so that they continue to be fed. A threaded ring 3004 is provided through the pusher plate 3005 at the top of the ramp 30. The connection between the threaded ring 3004 and the pusher plate 3005 is fixed by welding. The inside of the threaded ring 3004 is threadedly connected to the surface of the threaded rod 3002.

[0035] Limiting rods 3007 are fixedly installed at the lower ends of the baffles 33 distributed on both sides. Sufficient clearance is maintained between the limiting rods 3007 and the base 10 and the slope surface of the ramp 30 to avoid affecting material feeding. A limiting sleeve 3006 is installed through the bottom end of the pusher plate 3005 at the ramp 30. The connection between the limiting sleeve 3006 and the pusher plate 3005 is fixed by welding. The interior of the limiting sleeve 3006 is slidably fitted with the surface of the limiting rod 3007. When the pusher plate 3005 needs to be moved, power is applied. The power supply for motor 2 (3003) is connected to a forward / reverse switch via wires. The forward / reverse switch is model HY2-8, which can operate motor 2 (3003) in both directions. After motor 2 (3003) is started, its rotating shaft 2 can drive the threaded rod 3002 to rotate and cause the threaded ring 3004 to move. At this time, the pusher plate 3005 is driven. Through the limit sleeve 3006 sliding on the surface of the limit rod 3007, the pusher plate 3005 can move horizontally along the slope of the ramp 30.

[0036] In practice

[0037] The cleaning mechanism 1 in this scheme achieves the cleaning of alumina raw materials through the cooperation of the cleaning tank 12 and the material cylinder 13. The material cylinder 13 is placed in the cleaning tank 12, and its bottom is provided with a cylinder bottom 14. The surface of the cylinder bottom 14 has an internal hole 15, which allows the cleaning liquid to flow but blocks alumina particles. During cleaning, acid washing, alkaline washing, or clean water fully contacts the raw materials through the internal hole 15. The stirring blades 2004 of the stirring mechanism 2 agitate the solution to enhance the cleaning effect. After cleaning, the waste discharge pump 1003 is started and the valve 1002 is opened, and the waste liquid is discharged through the waste discharge port 1001. The material cylinder 13 can be lifted by the cylinder 23 to drain water, or it can be moved horizontally to the position of the unloading mechanism 3 by the guide rail auxiliary slide 22. The cylinder bottom 14 and the material cylinder 13 are fixed by the threaded sleeve 18 and the threaded post 17, and can be quickly discharged after disassembly.

[0038] The stirring mechanism 2 drives the stirring shaft 2002 to rotate via motor 2003, which in turn drives the stirring blades 2004 to agitate the cleaning liquid and alumina particles, improving the uniformity of cleaning. The scraper 2005 at the bottom of the stirring shaft 2002 fits against the bottom of the cylinder 14 to prevent the internal hole 15 from being blocked. The cylinder 23 adjusts the height of the material cylinder 13 via the piston rod to achieve soaking, draining, or removal operations. The guide rail auxiliary slide 22 slides along the guide rail auxiliary guide rail 20, which can horizontally move the material cylinder 13 to the unloading position. Mounting bracket 1 24 and mounting bracket 2 26 ensure the stable positioning of the material cylinder 13 and prevent tilting. This mechanism realizes the agitation control of the cleaning process, improving cleaning efficiency and raw material processing quality.

[0039] The feeding mechanism 3 receives alumina particles discharged from the feed cylinder 13 via the ramp 30. The particles slide down the ramp, and the filter holes 32 screen out fine impurities and drain water. The motor 3003 drives the threaded rod 3002 to rotate, which in turn moves the pusher plate 3005 along the ramp, pushing the stopped particles to continue feeding. The limit rod 3007 and the limit sleeve 3006 ensure the smooth movement of the pusher plate 3005. The waste hole 34 collects the screened impurities for centralized cleaning. This mechanism realizes automatic screening and transfer of raw materials after cleaning, reduces manual intervention, and improves feeding efficiency and cleanliness.

[0040] The above description is merely an embodiment of this utility model, and common knowledge such as specific structures and characteristics in the solution is not described in detail here. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model, and these should also be considered within the protection scope of this utility model. These modifications and improvements will not affect the effectiveness of the implementation of this utility model or its practicality.

Claims

1. An apparatus for the pretreatment of an alumina feedstock, characterized in that: It includes a cleaning mechanism, a stirring mechanism is provided above the cleaning mechanism, and a feeding mechanism is provided on one side of the cleaning mechanism.

2. The apparatus for pretreating an alumina feedstock according to claim 1, characterized in that: The cleaning mechanism includes a base, which is rectangular in structure. A base platform is provided below the base, and a cleaning tank is provided above the base. A material cylinder is provided inside the cleaning tank, and a cylinder bottom is provided at the bottom of the material cylinder. Several internal holes are opened on the surface of the cylinder bottom. Several internal sleeves are distributed throughout the bottom surface of the cylinder. A threaded post is provided at the connection end face between the cylinder and the bottom of the cylinder. The threaded post is installed through the internal sleeve. The threaded post is threaded and connected to the threaded sleeve. The end face of the threaded sleeve is fitted with the end face of the internal sleeve.

3. An apparatus for the pretreatment of alumina feed material according to claim 2, characterised in that: A waste discharge port is provided through one side of the cleaning tank. A valve is provided on the surface of the waste discharge port, and the valve core is embedded inside the waste discharge port. A waste discharge pump is provided at the end of the base near the waste discharge port. The feed end of the waste discharge pump is connected to the flange at the end of the waste discharge port away from the cleaning tank.

4. An apparatus for the pretreatment of alumina feed material according to claim 3, characterized in that: The stirring mechanism includes a guide rail sub-guide rail, which is set at the upper end of the base and symmetrically distributed along both sides of the washing tank. Anti-detachment blocks are provided at both ends of the guide rail sub-guide rails distributed along one side, and guide rail sub-slide seats are slidably arranged on the surface of the guide rail sub-guide rail. A cylinder is installed at the upper end of the guide rail slide. Inside the cylinder is a piston rod for extension and retraction. At the end of the piston rod is a mounting bracket one. The lower end of mounting bracket one is fixedly installed at the port of the material cylinder by screws. Mounting plates are installed at the upper ends of mounting bracket one distributed on both sides. Mounting bracket two is symmetrically distributed on the mounting plates perpendicular to the direction of mounting bracket one. The lower end of mounting bracket two is fixedly installed at the port of the material cylinder by screws.

5. An apparatus for the pretreatment of alumina feed material according to claim 4, characterised in that: A bushing is installed through the center of the mounting plate. A stirring shaft is rotatably installed inside the bushing. A motor is installed at the upper end of the stirring shaft. The outer wall of the motor is fixed to the surface of the mounting plate by a bracket. A drive shaft is installed inside the motor. The end of the drive shaft is fixedly connected to the end of the stirring shaft by a coupling. Several stirring blades are fixedly distributed on the surface of the stirring shaft. Several scrapers are installed at the lower end of the stirring shaft.

6. An apparatus for the pretreatment of alumina feed material according to claim 5, characterized in that: The feeding mechanism includes a ramp, the bottom of which is set on the surface of the base. Two symmetrically arranged pillars are fixed at the lower end of the ramp top. The lower ends of the pillars are supported on the surface of the base. Several filter holes penetrating the interior are opened on the ramp surface. Baffles are set on both sides of the ramp surface. The base is located directly below the ramp and has a waste material hole penetrating the interior.

7. The alumina raw material pretreatment device according to claim 6, characterized in that: The baffle is located at the top of the ramp and has a bearing installed through it. The bearings distributed on both sides have the same threaded rod installed through them. The threaded rod is interference-fitted with the inner ring wall of the bearing. A second motor is installed at the outer end of the threaded rod. The outer wall of the second motor is fixed to the surface of the baffle by a bracket. A second rotating shaft for driving is installed inside the second motor. The end of the second rotating shaft near the threaded rod is fixedly connected to the end of the threaded rod by a coupling. A pusher plate is installed on the surface of the threaded rod.

8. The alumina raw material pretreatment device according to claim 7, characterized in that: Limiting rods are fixedly installed at the lower ends of the baffles distributed on both sides. A limiting sleeve is provided through the bottom end of the pusher plate of the ramp. The inside of the limiting sleeve is slidably sleeved with the surface of the limiting rod.

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