Aluminum hydroxide slurry decomposing device for aluminum oxide production

Abstract

The utility model relates to the technical field of aluminum oxide production, and provides an aluminum hydroxide slurry decomposing device for aluminum oxide production, which comprises a tank body, the top of the tank body is fixedly connected with an air cylinder, the bottom of the output end of the air cylinder penetrates through the tank body and is fixedly connected with a water flow impact assembly, and a pressure pipe is arranged in an inner cavity of the water flow impact assembly. The air cylinder can be matched with the water flow impact assembly to drive the pressing pipe to reciprocate up and down in the tank body, the pressing rod is matched with the spiral track of the spiral opening to drive the rotating sleeve to drive the mixing blades to rotate alternately in the forward direction and the reverse direction, and a fixed flow field formed by single-direction stirring is broken; the multi-direction staggered turbulent flow is generated by the slurry in the tank body, a local flowing dead zone is eliminated, and meanwhile, the mixing paddles are spirally and upwards arranged and matched with positive and negative rotation switching, so that the mixing strength of the slurry in the axial direction and the radial direction is further improved, and the contact uniformity of particles and a decomposition medium is improved.

Description

Technical Field

[0001] This utility model relates to the field of alumina production technology, and in particular to a device for decomposing aluminum hydroxide slurry for alumina production. Background Technology

[0002] Aluminum hydroxide, due to its acidity, is also known as aluminum hydroxide monohydrate. It is classified into industrial grade and pharmaceutical grade according to its use. Aluminum hydroxide is a white colloidal substance that is almost insoluble in water. It has a slow, long-lasting, and strong acid resistance, astringent properties, and mucosal protection. It does not produce carbon dioxide, and there is no acid rebound or alkalosis. In the production process of aluminum hydroxide, it is necessary to decompose the aluminum hydroxide seed slurry.

[0003] Existing decomposition tanks mostly adopt a unidirectional stirring structure, which results in a fixed flow trajectory of the slurry within the tank. Local dead zones are easily formed, and the slurry that is not sufficiently stirred will stratify or agglomerate due to uneven mixing. This reduces the contact area between aluminum hydroxide particles and the decomposition medium, resulting in insufficient utilization of reactive sites and limiting decomposition efficiency. At the same time, because the slurry stays in the dead zones for too long, some areas will over-react and generate non-target crystalline products, affecting the consistency of alumina product quality, restricting capacity improvement and product stability, and is not conducive to use. Utility Model Content

[0004] In view of this, the present invention proposes an aluminum hydroxide slurry decomposition device for alumina production, which can quickly and evenly mix the slurry through bottom reciprocating mixing and multi-directional water flow rinsing, avoiding the occurrence of dead zones in local areas.

[0005] The technical solution of this utility model is implemented as follows: This utility model provides a device for decomposing aluminum hydroxide slurry for alumina production, including a tank. A cylinder is fixedly connected to the top of the tank. The bottom of the cylinder's output end penetrates the tank and is fixedly connected to a water flow impact component. A pressure pipe is provided in the inner cavity of the water flow impact component. The bottom of the pressure pipe penetrates into the inner cavity of the tank. A rotating sleeve is movably connected to the bottom of the inner cavity of the tank. A spiral opening is provided on the surface of the rotating sleeve. A pressure rod is provided on the left side of the rotating sleeve. The right side of the pressure rod penetrates the spiral opening and is fixedly connected to the pressure pipe. A mixing blade is fixedly connected to the surface of the rotating sleeve. A temperature control heating ring is fixedly connected to the surface of the tank.

[0006] More preferably, the water flow impact component includes a conveying shell, the top of which is fixedly connected to the output end of the cylinder, a limiting plate is provided in the inner cavity of the conveying shell, the bottom of the limiting plate is connected to the pressure pipe, a spring is fixedly connected to the top of the limiting plate, a water inlet pipe is connected to the left side of the conveying shell, a one-way valve is installed on the surface of both the water inlet pipe and the pressure pipe, and a water outlet hole is opened on the surface of the pressure pipe.

[0007] More preferably, a sliding rod is fixedly connected to the right side of the top of the inner cavity of the tank, a sliding sleeve is slidably connected to the surface of the sliding rod, the left side of the sliding sleeve is fixedly connected to the conveying shell, and a limit block is fixedly connected to the bottom of the sliding rod.

[0008] More preferably, a mounting bracket is fixedly connected to the surface of the water inlet pipe, and the right side of the mounting bracket is fixedly connected to the conveying shell.

[0009] More preferably, the bottom of the rotating sleeve is movably connected to the inner wall of the tank via a bearing, and the mixing blades are mounted on the surface of the rotating sleeve in a spiral upward manner.

[0010] More preferably, a discharge pipe is connected to the bottom right side of the tank, and a sealing cap is threaded to the right end of the discharge pipe, while an injection pipe is connected to the left side of the top of the tank.

[0011] More preferably, a stabilizing frame is fixedly connected to the surface of the cylinder, and both sides of the bottom of the stabilizing frame are fixedly connected to the tank body, and a stabilizing support leg is fixedly connected to the bottom of the tank body.

[0012] The aluminum hydroxide slurry decomposition device for alumina production according to this invention has the following advantages over the prior art:

[0013] (1) By setting the cylinder to cooperate with the water flow impact component, the pressure pipe is driven to move up and down in the tank. The pressure rod and the spiral opening are coordinated to drive the rotating sleeve to drive the mixing blade to rotate alternately in the forward and reverse directions, breaking the fixed flow field formed by stirring in one direction, so that the slurry generates multi-directional turbulence in the tank, eliminating local flow dead zones. At the same time, the mixing blade adopts a spiral upward layout, which, combined with the forward and reverse rotation, further improves the mixing intensity of the slurry in the axial and radial directions, enhances the contact uniformity between particles and decomposition media, and maintains the internal temperature balance of the tank through the temperature control heating ring to avoid local overheating or overcooling, which may cause overreaction or abnormal crystal form.

[0014] (2) By setting up an inlet pipe and a pressure pipe, the slurry at the bottom of the tank can be sucked into the conveying shell during the reciprocating motion of the cylinder using a one-way valve. The slurry is then sprayed out at high speed through the water outlet on the surface of the pressure pipe, forming an up-and-down circulating impact water flow that washes the sedimentation area at the bottom of the tank. At the same time, the forward and reverse rotation of the rotating sleeve drives the mixing blades to perform secondary shearing and diffusion on the impact water flow, effectively preventing the slurry from agglomerating or stratifying, improving the dispersion of aluminum hydroxide particles and the utilization rate of reactive sites, shortening the decomposition reaction time, and improving production efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is the front view of the present invention;

[0017] Figure 2 This is a cross-sectional view of the tank body of this utility model;

[0018] Figure 3 This is a schematic diagram of the water flow impact component of this utility model;

[0019] Figure 4 This is a schematic diagram of the pressure tube, rotating sleeve, spiral opening, and mixing blade of this utility model.

[0020] The components are as follows: 1. Tank body; 2. Cylinder; 3. Water flow impact assembly; 4. Pressure pipe; 5. Rotating sleeve; 6. Spiral opening; 7. Pressure rod; 8. Mixing blade; 9. Temperature control heating ring; 31. Conveying shell; 32. Limiting plate; 33. Spring; 34. Water inlet pipe; 35. One-way valve; 36. Water outlet; 10. Discharge pipe; 11. Injection pipe; 12. Stabilizing frame; 13. Stabilizing support leg. Detailed Implementation

[0021] The technical solutions of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] like Figure 1-4 As shown, this utility model discloses an aluminum hydroxide slurry decomposition device for alumina production, comprising a tank body 1, a cylinder 2 fixedly connected to the top of the tank body 1, a water flow impact component 3 fixedly connected to the bottom of the output end of the cylinder 2 through the tank body 1, a pressure pipe 4 provided in the inner cavity of the water flow impact component 3, the bottom of the pressure pipe 4 penetrating into the inner cavity of the tank body 1, a rotating sleeve 5 movably connected to the bottom of the inner cavity of the tank body 1, a spiral opening 6 opened on the surface of the rotating sleeve 5, a pressure rod 7 provided on the left side of the rotating sleeve 5, the right side of the pressure rod 7 penetrating through the spiral opening 6 and fixedly connected to the pressure pipe 4, a mixing blade 8 fixedly connected to the surface of the rotating sleeve 5, and a temperature control heating ring 9 fixedly connected to the surface of the tank body 1.

[0023] The cylinder 2 is used to control the height of the conveying shell 31 and the pressure pipe 4. By applying pressure to the pressure pipe 4, the pressure rod 7 is moved downward. During the movement, the pressure rod 7 moves downward along the spiral opening 6, forcing the rotating sleeve 5 and the mixing blade 8 to rotate. The rotating mixing blade 8 stirs the slurry. Then the cylinder 2 is reset, and the pressure rod 7 moves upward along the spiral opening 6, causing the mixing blade 8 to reverse. By continuously making the mixing blade 8 rotate forward and backward, dead flow zones are avoided in local areas inside the tank 1, allowing the slurry to generate water flow in all directions, improving the stirring effect of the slurry and increasing the decomposition efficiency. The temperature control heating ring 9 is used to control the temperature of the slurry inside the tank 1 to avoid large temperature changes.

[0024] like Figure 2 and Figure 3 As shown, the water flow impact assembly 3 includes a conveying shell 31. The top of the conveying shell 31 is fixedly connected to the output end of the cylinder 2. A limit plate 32 is provided in the inner cavity of the conveying shell 31. The bottom of the limit plate 32 is connected to the pressure pipe 4. A spring 33 is fixedly connected to the top of the limit plate 32. A water inlet pipe 34 is connected to the left side of the conveying shell 31. A one-way valve 35 is installed on the surface of both the water inlet pipe 34 and the pressure pipe 4. A water outlet hole 36 is opened on the surface of the pressure pipe 4. A sliding rod is fixedly connected to the right side of the top of the inner cavity of the tank 1. A sliding sleeve is slidably connected to the surface of the sliding rod. The left side of the sliding sleeve is fixedly connected to the conveying shell 31. A limit block is fixedly connected to the bottom of the sliding rod. A mounting bracket is fixedly connected to the surface of the water inlet pipe 34. The right side of the mounting bracket is fixedly connected to the conveying shell 31.

[0025] The conveying shell 31 is used to temporarily store the slurry. The limiting plate 32 can limit the pressure pipe 4 to prevent it from falling out of the inner cavity of the conveying shell 31. The spring 33 can reset the conveying shell 31. The water inlet pipe 34 is used to draw the slurry inside the tank 1 into the conveying shell 31. The one-way valve 35 can discharge the slurry through the pressure pipe 4 when the conveying shell 31 is pressed down, and the slurry enters through the water inlet pipe 34 when the conveying shell 31 is reset. The water outlet 36 can spray out the slurry to improve the mixing effect of the slurry inside the tank 1. The sliding rod and sliding sleeve can limit the conveying shell 31 so that it can move up and down smoothly. The limiting block is used to prevent the sliding sleeve from falling off the surface of the sliding rod. The mounting bracket can increase the stability of the water inlet pipe 34.

[0026] like Figure 1 and Figure 4As shown, the bottom of the rotating sleeve 5 is movably connected to the inner wall of the tank 1 via a bearing. The mixing blade 8 is installed on the surface of the rotating sleeve 5 in a spiral upward manner. The bottom right side of the tank 1 is connected to a discharge pipe 10, and the right end of the discharge pipe 10 is threaded with a sealing cap. The left side of the top of the tank 1 is connected to an injection pipe 11. The surface of the cylinder 2 is fixedly connected to a stabilizing frame 12, and both sides of the bottom of the stabilizing frame 12 are fixedly connected to the tank 1. The bottom of the tank 1 is fixedly connected to a stabilizing support leg 13.

[0027] By setting bearings, the stability of the rotating sleeve 5 during rotation can be increased. The discharge pipe 10 can discharge the decomposed slurry from the tank 1. The injection pipe 11 can inject the slurry into the tank 1. The stabilizer 12 is used to improve the stability of the cylinder 2 installation and fixation. The stabilizer leg 13 can increase the stability of the tank 1 during operation and prevent it from shifting.

[0028] The working principle of the aluminum hydroxide slurry decomposition device for alumina production of this utility model is as follows: The cylinder 2 is activated, driving the water flow impact component 3 to move the pressure pipe 4 up and down reciprocatingly within the tank 1. When the cylinder 2 pushes the conveying shell 31 downwards, the slurry in the pressure pipe 4 is ejected at high speed through the water outlet 36, forming an impact water flow that washes the sedimentation area at the bottom of the tank 1, effectively preventing slurry agglomeration or stratification, improving the dispersion of aluminum hydroxide particles and the utilization rate of reactive sites, and shortening the decomposition reaction time. Simultaneously, the pressure rod 7 moves downwards along the spiral trajectory of the spiral opening 6, forcing the rotating sleeve 5 to drive the mixing blade 8 to rotate in the forward direction, stirring the slurry radially and... In the axial mixing flow field, when cylinder 2 is reset, spring 33 pushes conveying shell 31 upward, and water inlet pipe 34 sucks the slurry from the bottom of tank 1 into conveying shell 31 through one-way valve 35. Pressure rod 7 moves upward along spiral opening 6 to make rotating sleeve 5 rotate in the opposite direction. Mixing blade 8 performs reverse shearing on slurry, breaking the fixed flow field structure. With forward and reverse rotation switching, the mixing intensity of slurry in the axial and radial directions is further improved, and the contact uniformity between particles and decomposition medium is enhanced. Through the continuous reciprocating drive of cylinder 2, the alternating forward and reverse stirring of mixing blade 8 and the periodic scouring effect of impact water flow work together to eliminate flow dead zones and improve slurry mixing uniformity and decomposition efficiency.

[0029] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An apparatus for decomposing an aluminum hydroxide slurry used in the production of aluminum oxide, characterized by: The device includes a tank (1), a cylinder (2) is fixedly connected to the top of the tank (1), a water flow impact component (3) is fixedly connected to the bottom of the output end of the cylinder (2) through the tank (1), a pressure pipe (4) is provided in the inner cavity of the water flow impact component (3), the bottom of the pressure pipe (4) extends into the inner cavity of the tank (1), a rotating sleeve (5) is movably connected to the bottom of the inner cavity of the tank (1), a spiral opening (6) is provided on the surface of the rotating sleeve (5), a pressure rod (7) is provided on the left side of the rotating sleeve (5), the right side of the pressure rod (7) extends through the spiral opening (6) and is fixedly connected to the pressure pipe (4), a mixing blade (8) is fixedly connected to the surface of the rotating sleeve (5), and a temperature control heating ring (9) is fixedly connected to the surface of the tank (1).

2. The apparatus for decomposing an aluminum hydroxide slurry for producing alumina according to claim 1, wherein: The water flow impact component (3) includes a conveying shell (31), the top of which is fixedly connected to the output end of the cylinder (2). The inner cavity of the conveying shell (31) is provided with a limiting plate (32), the bottom of which is connected to the pressure pipe (4). A spring (33) is fixedly connected to the top of the limiting plate (32). A water inlet pipe (34) is connected to the left side of the conveying shell (31). A one-way valve (35) is installed on the surface of both the water inlet pipe (34) and the pressure pipe (4). A water outlet hole (36) is opened on the surface of the pressure pipe (4).

3. The apparatus for decomposing an aluminum hydroxide slurry for producing alumina according to claim 2, wherein: A sliding rod is fixedly connected to the right side of the top of the inner cavity of the tank (1), and a sliding sleeve is slidably connected to the surface of the sliding rod. The left side of the sliding sleeve is fixedly connected to the conveying shell (31), and a limit block is fixedly connected to the bottom of the sliding rod.

4. The apparatus for decomposing an aluminum hydroxide slurry for producing alumina according to claim 2, wherein: The surface of the water inlet pipe (34) is fixedly connected to a mounting bracket, and the right side of the mounting bracket is fixedly connected to the conveying shell (31).

5. The apparatus for decomposing an aluminum hydroxide slurry for alumina production according to claim 1, wherein: The bottom of the rotating sleeve (5) is movably connected to the inner wall of the tank (1) via a bearing, and the mixing blade (8) is installed on the surface of the rotating sleeve (5) in a spiral upward manner.

6. The apparatus for decomposing an aluminum hydroxide slurry for alumina production according to claim 1, wherein: The bottom right side of the tank (1) is connected to a discharge pipe (10), and the right end of the discharge pipe (10) is threaded with a sealing cap. The left side of the top of the tank (1) is connected to an injection pipe (11).

7. The apparatus for decomposing an aluminum hydroxide slurry for alumina production according to claim 1, wherein: A stabilizing frame (12) is fixedly connected to the surface of the cylinder (2). Both sides of the bottom of the stabilizing frame (12) are fixedly connected to the tank body (1). A stabilizing support leg (13) is fixedly connected to the bottom of the tank body (1).

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