High pressure vessel for the preparation of an alumina slurry

Abstract

The utility model discloses a kind of high-pressure vessels for preparing alumina slurry applied to pressure vessel field, through the scraper one being oppositely arranged with discharge pipe, when discharging, the centrifugal force is utilized to accelerate the outside discharge of slurry, improve discharging efficiency;Meanwhile, through the kettle body of horizontal cylindrical structure and the scraper disc moving along the axial direction of stirring shaft, promote slurry to move to one side of stirring disc, further improve discharging speed, and the slurry remaining in kettle body inner wall and stirring shaft outer wall is scraped and cleaned, further reduce slurry remaining;In addition, through the sleeve and scraper two of linkage with stirring shaft, not only improve the stirring effect to raw material, but also improve the scraping and cleaning effect to residual slurry, further improve discharging efficiency, reduce slurry remaining probability.

Description

Technical Field

[0001] This utility model relates to the field of pressure vessels, and in particular to a high-pressure vessel for preparing alumina slurry. Background Technology

[0002] High-pressure vessels for alumina slurry preparation are core equipment in the leaching process of alumina slurry production. Typical examples include pressure cookers and high-pressure leaching units. Their design pressure often reaches above 8.7 MPa and the temperature exceeds 200℃. They need to withstand strong alkali corrosion and slurry scouring. Structurally, they adopt thick-walled cylinders and high-strength steel (such as 16MnR). Some are equipped with stirring devices and multi-stage self-evaporators to achieve slurry leaching through direct or indirect heating with steam.

[0003] The existing patent with publication number CN214288203U discloses a reaction vessel for producing alumina. By setting a turntable at the end of the stirring shaft away from the stirring motor, and installing a stirring rod on the side of the turntable away from the machine cover, and setting a trapezoidal stirring paddle at the end of the stirring rod away from the turntable, after the stirring motor is started, the stirring shaft drives the turntable to rotate, which in turn drives the stirring paddle to rotate. The special structure of the trapezoidal stirring paddle makes the solution in the reaction vessel fully mixed, effectively solving the problem of insufficient mixing.

[0004] The existing patent with publication number CN108083307B discloses an alumina reactor with crushing and screening feeding. In the alumina reactor with crushing and screening feeding, the material is fed by an auger in the feeding pipe, while the stirring rod drives the stirring rod to disperse the raw material. This avoids the harm to the human body caused by long-term manual contact with chemical raw materials during feeding, thus improving the safety of feeding. Moreover, with the cooperation of the crushing rod and the screening screen, the raw material is crushed and screened to obtain raw material with qualified particle size. This increases the contact area of ​​the crushed and screened raw material, thereby making the reaction to produce alumina more efficient and thorough.

[0005] The aforementioned prior art discloses a technical solution for improving the mixing effect by using a turntable and a stirring paddle, and also discloses a technical solution for achieving automatic feeding and crushing by using a crushing screen and a auger. However, the prior art still has shortcomings. During the preparation process of alumina slurry, its viscosity gradually increases as the evaporation process proceeds. When feeding, the slurry is prone to residue and the discharge speed is slow. Utility Model Content

[0006] The core of this invention lies in solving the problems of easy slurry residue and slow discharge speed in the prior art by using a mixing plate and a scraper plate. At the same time, the cleaning effect of residual slurry is improved by the cooperation of scraper plate 2 and scraper plate 1.

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] A high-pressure vessel for preparing alumina slurry includes a vessel body, which is a horizontal cylindrical structure. A rotating ring is rotatably connected to the inner wall of the vessel body, and a stirring disc is fixedly connected to the left end of the rotating ring. Multiple scrapers are fixedly connected to the left side of the stirring disc in a circumferentially evenly distributed manner. The radial outer edge of the scrapers is slidably connected to the inner wall of the vessel body. A stirring shaft is inserted through the center of the stirring disc. The right end of the stirring shaft is rotatably connected to the inner wall of the vessel body, and the left end of the stirring shaft is fixedly connected to the output shaft of a motor. The housing of the motor is fixedly connected to the outer wall of the vessel body. A toothed ring is fixedly connected to the inner wall of the rotating ring, and a transmission gear meshes with the inner side of the toothed ring. The transmission gear is rotatably connected to the inner wall of the vessel body through a mounting shaft. A drive gear meshes with the inner side of the transmission gear, and the drive gear is fixedly connected to the stirring shaft.

[0009] The lower part of the vessel body has a discharge hole that is opposite to the scraper. A discharge pipe that communicates with the discharge hole is fixedly connected to the outer wall of the vessel body. An electrically controlled valve is fixedly connected to the discharge pipe. A scraper is slidably connected to the stirring shaft. The outer wall of the scraper is slidably connected to the inner wall of the vessel body. A piston rod of an electric push rod is fixedly connected to the left side of the scraper. The housing of the electric push rod is fixedly connected to the outer wall of the vessel body.

[0010] Furthermore, both the mixing plate and the scraper plate are disc-shaped, and both have a central hole at their center for the mixing shaft to pass through.

[0011] Furthermore, an infrared distance sensor is fixedly connected to the inner wall on the left side of the vessel. The detection end of the infrared distance sensor is positioned opposite to the scraper. The motor, electric push rod, and infrared distance sensor are all electrically connected to the same controller.

[0012] Furthermore, the rotating ring has a vertical circular structure and is integrally formed with the stirring plate. An annular groove for the rotating ring to rotate is provided on the inner wall of the right side of the vessel body. The toothed ring, transmission gear, and drive gear are all installed on the inner side of the rotating ring.

[0013] Furthermore, a feeding pipe is fixedly connected to the upper end of the vessel body, and a cover plate is bolted to the upper end of the feeding pipe. Multiple heating devices are equidistantly distributed inside the vessel shell, and the heating devices are electrically connected to the controller. A base is fixedly connected to the lower end of the vessel body.

[0014] Furthermore, the scraper has a rectangular plate structure and is arranged along the radial direction of the stirring plate. The contact surface between the scraper and the inner wall of the vessel is an arc-shaped surface.

[0015] Furthermore, a sleeve is rotatably connected to the center of the scraper, and the sleeve is connected to the stirring shaft via a spline. The sleeve extends to the right side of the scraper and is fixedly connected to a second scraper that is evenly distributed around the circumference. The left end of the second scraper is slidably connected to the right side wall of the scraper, and the second scraper and the first scraper are offset radially.

[0016] Furthermore, the stirring shaft is a prism shaft with a regular polygonal cross-section, and the sleeve has a prismatic hole that mates with the stirring shaft. The axial widths of scraper one and scraper two are equal.

[0017] Compared with existing technologies, the advantages of this utility model are:

[0018] (1) The present invention uses a scraper that is set opposite to the discharge pipe to accelerate the discharge of slurry by centrifugal force during discharge, thereby improving the discharge efficiency. At the same time, the vessel body with a horizontal cylindrical structure and the scraper that moves along the stirring shaft axis push the slurry to the side of the stirring plate, thereby further improving the discharge speed and scraping and cleaning the slurry residue on the inner wall of the vessel body and the outer wall of the stirring shaft, thereby reducing slurry residue.

[0019] (2) This utility model improves the mixing effect of raw materials by using a sleeve and scraper II linked with the mixing shaft, and at the same time improves the scraping and cleaning effect of residual slurry, further improving the discharge efficiency and reducing the probability of slurry residue. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0022] Figure 3 This is a schematic diagram of the connection structure between the stirring plate and the scraper plate in this utility model;

[0023] Figure 4 This is an exploded assembly diagram of the stirring disc in this utility model;

[0024] Figure 5 This is a cross-sectional view of the scraper in this utility model.

[0025] Figure 6 This is a cross-sectional view of the stirring plate in this utility model;

[0026] Figure 7 This is a schematic diagram showing the rotation of the stirring plate and scraper plate in this utility model;

[0027] Figure 8 This is a schematic diagram showing the contact between the scraper and the mixing plate in this utility model.

[0028] Explanation of the labels in the diagram:

[0029] 1. Kettle body; 101. Discharge hole; 2. Stirring plate; 3. Scraper 1; 4. Rotating ring; 5. Gear ring; 6. Transmission gear; 7. Mounting shaft; 8. Drive gear; 9. Stirring shaft; 10. Motor; 11. Discharge pipe; 12. Scraper; 13. Sleeve; 14. Scraper 2; 15. Electric push rod; 16. Infrared distance sensor; 17. Heating device; 18. Feeding pipe; 19. Cover plate; 20. Base. Detailed Implementation

[0030] The technical solution will now be clearly and completely described with reference to the accompanying drawings in the embodiments of this utility model.

[0031] First implementation method

[0032] Please see Figures 1-8 In one embodiment of this utility model, a high-pressure container for preparing alumina slurry includes a vessel body 1, which has a horizontal cylindrical structure. A rotating ring 4 is rotatably connected to the inner wall of the right side of the vessel body 1. A stirring plate 2 is fixedly connected to the left end of the rotating ring 4. Multiple scrapers 3 are fixedly connected to the left side of the stirring plate 2 in a circumferentially evenly distributed manner. The radial outer edge of the scrapers 3 is slidably connected to the inner wall of the vessel body 1. A stirring shaft 9 is inserted through the center of the stirring plate 2. The right end of the stirring shaft 9 is rotatably connected to the inner wall of the vessel body 1. The left end of the stirring shaft 9 is fixedly connected to the output shaft of a motor 10. The housing of the motor 10 is fixedly connected to the outer wall of the vessel body 1. The motor 10 drives the stirring shaft 9 to rotate.

[0033] Please see Figure 2 , Figure 3 and Figure 7 A toothed ring 5 is fixedly connected to the inner wall of the rotating ring 4. A transmission gear 6 meshes with the inner side of the toothed ring 5. The transmission gear 6 is rotatably connected to the inner wall of the vessel body 1 through the mounting shaft 7. A drive gear 8 meshes with the inner side of the transmission gear 6. The drive gear 8 is fixedly connected to the stirring shaft 9. The stirring shaft 9 drives the drive gear 8 to rotate. The drive gear 8 drives the toothed ring 5 to rotate through the transmission gear 6. The toothed ring 5 drives the stirring disc 2 to rotate through the rotating ring 4. The stirring disc 2 drives the scraper 3 on it to rotate.

[0034] Please see Figure 2 The lower part of the vessel body 1 has a discharge hole 101 that is opposite to the scraper 3. The outer wall of the vessel body 1 is fixedly connected to a discharge pipe 11 that communicates with the discharge hole 101. An electric control valve is fixedly connected to the discharge pipe 11. A scraper 12 is slidably connected to the stirring shaft 9. The outer wall of the scraper 12 is slidably connected to the inner wall of the vessel body 1. The piston rod of the electric push rod 15 is fixedly connected to the left side of the scraper 12. The housing of the electric push rod 15 is fixedly connected to the outer wall of the vessel body 1. The electric push rod 15 drives the scraper 12 to move along the axial direction of the stirring shaft 9 through the piston rod. The scraper 12 scrapes and cleans the alumina slurry remaining on the inner wall of the vessel body 1 and the outer wall of the stirring shaft 9.

[0035] Specifically, during discharge, firstly, the electrically controlled valve on the discharge pipe 11 is opened, and then the motor 10 is started, causing the stirring disc 2 to drive the scraper 3 to rotate. The centrifugal force generated by the circumferential rotation of the scraper 3 increases the flow rate of the alumina slurry entering the discharge pipe 11 through the discharge hole 101. Simultaneously, the electric push rod 15 is activated, and the scraper 12 moves axially along the stirring shaft 9. The scraper 12 pushes the alumina slurry in the vessel 1 towards one side of the discharge pipe 11, cleaning the residual alumina slurry on the inner wall of the vessel 1 and the outer wall of the stirring shaft 9, thus increasing the discharge speed while cleaning the residual slurry. The scraper 12 moves to the right until the scraper 3 contacts the left side of the scraper 12, at which point the electric push rod 15 stops extending. At this point, please refer to... Figure 8 The rotating scraper 3 cleans the edge of the left side of the scraper disc 12, further reducing residual slurry.

[0036] Compared to traditional high-pressure vessels, this invention utilizes a scraper 3 positioned opposite the discharge pipe 11 to accelerate the discharge of slurry using centrifugal force, thereby improving discharge efficiency. Simultaneously, the horizontally cylindrical vessel body 1 and the scraper 12, which moves axially along the stirring shaft 9, push the slurry towards the stirring plate 2, further increasing the discharge speed while scraping and cleaning the slurry residue on the inner wall of the vessel body 1 and the outer wall of the stirring shaft 9, reducing slurry residue.

[0037] Please see Figure 3 and Figure 4 Both the stirring plate 2 and the scraper plate 12 are disc-shaped, and both have a central hole at their center for the stirring shaft 9 to pass through.

[0038] Specifically, when the scraper 12 moves to one side of the mixing plate 2, the scraper 3 rotates and scrapes the edge of the scraper 12 side wall to further reduce the slurry remaining on the side wall of the scraper 12.

[0039] Please see Figure 1 and Figure 2 An infrared distance sensor 16 is fixedly connected to the inner wall of the left side of the vessel body 1. The detection end of the infrared distance sensor 16 is set opposite to the scraper 12. The motor 10, the electric push rod 15 and the infrared distance sensor 16 are all electrically connected to the same controller.

[0040] Specifically, the position of the scraper 12 inside the reactor body 1 is detected in real time by the infrared distance sensor 16, and the position of the scraper 12 inside the reactor body 1 is controlled by the electric push rod 15 to ensure the contact effect between the scraper 12 and the scraper 3. It should be noted that the electric control valve on the discharge pipe 11 is also electrically connected to the controller to realize the automatic control of discharge.

[0041] Please see Figure 2 , Figure 3 and Figure 4The rotating ring 4 has a vertical circular structure and is integrally formed with the stirring plate 2. The inner wall of the right side of the vessel body 1 has an annular groove for the rotating ring 4 to rotate. The toothed ring 5, the transmission gear 6, and the drive gear 8 are all installed on the inner side of the rotating ring 4.

[0042] Specifically, the stirring plate 2 is rotated stably by rotating the ring 4.

[0043] Please see Figure 1 and Figure 2 The upper end of the vessel body 1 is fixedly connected to a feeding pipe 18, and the upper end of the feeding pipe 18 is connected to a cover plate 19 by bolts. Multiple heating devices 17 are provided inside the shell wall of the vessel body 1 at equal intervals. The heating devices 17 are electrically connected to the controller. The lower end of the vessel body 1 is fixedly connected to a base 20.

[0044] Specifically, based on the volume of the reactants, the position of the scraper 12 within the vessel 1 is controlled to achieve effective reaction volume control (the scraper 12 divides the inner cavity of the vessel 1 into left and right parts, with only the right side cavity used for the reaction of the reactants; thus, the effective reaction volume can be changed by adjusting the position of the scraper 12). Based on the position of the scraper 12, the heating device 17 located between the scraper 12 and the stirring plate 2 is activated, reducing power consumption and reducing the area of ​​the inner wall of the cavity that is adhered to by the slurry splash. It should be noted that the heating device 17 is a heating coil.

[0045] In this embodiment, the scraper 3 has a rectangular plate structure and is arranged along the radial direction of the stirring plate 2. The contact surface between the scraper 3 and the inner wall of the vessel body 1 is an arc-shaped surface.

[0046] Specifically, the inner wall of the vessel body 1 and the side wall of the scraper 12 are rotated and cleaned using the scraper 3.

[0047] Second implementation method

[0048] Based on the first implementation, please refer to Figures 2-8 A sleeve 13 is rotatably connected to the center of the scraper 12. The sleeve 13 is connected to the stirring shaft 9 via a spline. The sleeve 13 extends to the right side of the scraper 12 and is fixedly connected to a second scraper 14 that is evenly distributed around the circumference. The left end of the second scraper 14 is slidably connected to the right side wall of the scraper 12. The second scraper 14 and the first scraper 3 are offset in the radial direction.

[0049] For details, please refer to Figure 7 and Figure 8When the motor 10 drives the stirring shaft 9 to rotate, the stirring shaft 9 drives the stirring disc 2 to rotate through the transmission gear set (gear ring 5, transmission gear 6, drive gear 8). At the same time, the stirring shaft 9 drives the sleeve 13 to rotate, and the sleeve 13 drives the scraper 14 to rotate. The direction of the circumferential rotation of the scraper 14 is opposite to the direction of rotation of the scraper 3. During stirring, both the scraper 3 and the scraper 14 participate in the stirring and mixing of the raw materials, improving the stirring effect. During discharge, the scraper 14 scrapes and cleans the side walls of the scraper disc 12 and the stirring disc 2, further improving the discharge speed while reducing the slurry residue on the side walls of the scraper disc 12 and the stirring disc 2. In addition, the radially offset scraper 3 and scraper 14 avoid interference between them during rotation.

[0050] Compared with traditional high-pressure containers, this invention improves the stirring effect of raw materials by using a sleeve 13 and a scraper 14 linked with the stirring shaft 9. At the same time, it improves the scraping and cleaning effect of residual slurry, further improving the discharge efficiency and reducing the probability of slurry residue.

[0051] Please see Figure 4 and Figure 5 The stirring shaft 9 is a prism shaft with a regular polygonal cross-section. The sleeve 13 has a prism-shaped hole that matches the stirring shaft 9. The axial widths of scraper 1 3 and scraper 2 14 are equal.

[0052] Specifically, the sleeve 13 slides and transmits torque on the stirring shaft 9 through a spline connection. In addition, scraper 1 3 and scraper 2 14 with equal axial widths make scraper 1 3 contact the side wall of scraper 12 while scraper 2 14 contacts the side wall of stirring plate 2. Scraper 1 3 and scraper 2 14 work together to scrape and clean the slurry.

[0053] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. A high-pressure vessel for preparing alumina slurry, characterized in that, The vessel includes a vessel body (1), which is a horizontal cylindrical structure. A rotating ring (4) is rotatably connected to the inner wall of the right side of the vessel body (1). A stirring plate (2) is fixedly connected to the left end of the rotating ring (4). Multiple scrapers (3) are fixedly connected to the left side of the stirring plate (2) and are evenly distributed in a circle. The radial outer edge of the scrapers (3) is slidably connected to the inner wall of the vessel body (1). A stirring shaft (9) is inserted through the center of the stirring plate (2). The right end of the stirring shaft (9) is rotatably connected to the inner wall of the vessel body (1). The left end of the stirring shaft (9) is fixedly connected to the output shaft of a motor (10). The housing of the motor (10) is fixedly connected to the outer wall of the vessel body (1). A toothed ring (5) is fixedly connected to the inner wall of the rotating ring (4). A transmission gear (6) meshes with the inner side of the toothed ring (5). The transmission gear (6) is rotatably connected to the inner wall of the vessel body (1) through a mounting shaft (7). A drive gear (8) meshes with the inner side of the transmission gear (6). The drive gear (8) is fixedly connected to the stirring shaft (9). The lower part of the vessel body (1) is provided with a discharge hole (101) opposite to the scraper (3). The outer wall of the vessel body (1) is fixedly connected with a discharge pipe (11) communicating with the discharge hole (101). An electric control valve is fixedly connected to the discharge pipe (11). A scraper (12) is slidably connected to the stirring shaft (9). The outer wall of the scraper (12) is slidably connected to the inner wall of the vessel body (1). The piston rod of an electric push rod (15) is fixedly connected to the left side of the scraper (12). The housing of the electric push rod (15) is fixedly connected to the outer wall of the vessel body (1).

2. The high-pressure vessel for preparing alumina slurry according to claim 1, characterized in that, Both the stirring plate (2) and the scraper plate (12) are disc-shaped structures, and both have a central hole at their center for the stirring shaft (9) to pass through.

3. The high-pressure vessel for preparing alumina slurry according to claim 1, characterized in that, An infrared distance sensor (16) is fixedly connected to the inner wall of the left side of the vessel body (1). The detection end of the infrared distance sensor (16) is set opposite to the scraper (12). The motor (10), the electric push rod (15) and the infrared distance sensor (16) are all electrically connected to the same controller.

4. The high-pressure vessel for preparing alumina slurry according to claim 1, characterized in that, The rotating ring (4) has a vertical circular structure and is integrally formed with the stirring plate (2). The inner wall of the right side of the vessel body (1) is provided with an annular groove for the rotating ring (4) to rotate. The toothed ring (5), transmission gear (6), and drive gear (8) are all installed on the inner side of the rotating ring (4).

5. A high-pressure vessel for preparing alumina slurry according to claim 1, characterized in that, The upper end of the vessel body (1) is fixedly connected to a feeding pipe (18), and the upper end of the feeding pipe (18) is connected to a cover plate (19) by bolts. Multiple heating devices (17) are provided in the shell wall of the vessel body (1) at equal intervals. The heating devices (17) are electrically connected to the controller. The lower end of the vessel body (1) is fixedly connected to a base (20).

6. A high-pressure vessel for preparing alumina slurry according to claim 1, characterized in that, The scraper (3) has a rectangular plate structure and is arranged along the radial direction of the stirring plate (2). The contact surface between the scraper (3) and the inner wall of the vessel (1) is an arc surface.

7. A high-pressure vessel for preparing alumina slurry according to claim 1, characterized in that, A sleeve (13) is rotatably connected to the center of the scraper (12). The sleeve (13) is connected to the stirring shaft (9) via a spline. The sleeve (13) extends to the right side of the scraper (12) and is fixedly connected to a second scraper (14) that is evenly distributed around the circumference. The left end of the second scraper (14) is slidably connected to the right side wall of the scraper (12). The second scraper (14) and the first scraper (3) are offset in the radial direction.

8. A high-pressure vessel for preparing alumina slurry according to claim 7, characterized in that, The stirring shaft (9) is a prism shaft with a regular polygonal cross section. The sleeve (13) has a prism-shaped hole that matches the stirring shaft (9). The axial widths of scraper one (3) and scraper two (14) are equal.

Images