Foam eliminating device for decomposition process in aluminum oxide production

Abstract

The invention discloses an aluminum oxide production decomposition process foam eliminating device, and relates to the technical field of foam eliminating devices, the aluminum oxide production decomposition process foam eliminating device comprises a decomposition tank, a driving mechanism, a stirring assembly, a plurality of mounting seats and a plurality of fin structures, the driving mechanism is arranged in the center of the top of the decomposing tank, the driving end of the driving mechanism is fixedly connected with the upper end of the stirring shaft, the stirring shaft penetrates into the decomposing tank, the stirring blades are arranged on the side surface of the stirring shaft, and the fin structures are arranged on the stirring assembly in an annular matrix mode through the mounting bases; bubbles in slurry are cut and crushed through the cutting sections in the fin structures, due to the pressure intensity, air after bubble crushing flows towards the stirring shaft along the flow guide sections and is discharged upwards from the slurry along the side wall of the stirring shaft, foam generation is avoided through bubble elimination, groove top scabbing is effectively restrained, the operation risk is reduced, and the service life of the stirring shaft is prolonged. The maintenance safety is improved, and the production continuity is improved.

Description

Technical Field

[0001] The invention relates to the technical field of foam elimination devices, in particular to a foam elimination device for a decomposition process in aluminum oxide production. Background Art

[0002] ‌With the increasing shortage of domestic bauxite resources, the proportion of imported ore has increased year by year. While it brings advantages such as rich resources and low alkali consumption, its disadvantages are also becoming increasingly prominent. The ore consumption is high and the organic matter content is high. Most of the organic matter enters the slurry of the decomposition process after dissolution, sedimentation and separation, which increases the viscosity of the slurry and easily generates bubbles. At the same time, during the decomposition process, the impact of the feed slurry in the decomposition tank during the descent process is easy to generate bubbles. During the stirring process, air will be mixed into the slurry, which will also promote the generation of bubbles. Multiple bubbles gather to form foam.

[0003] A large amount of foam will gather at the top of the decomposition tank, gradually attaching to the side walls of the tank and the top support beam, forming high-position scarring. After the high-position scarring blocks fall off, they are easy to accumulate at the bottom, which will cause harm to the mixing system and affect continuous production; when cleaning the tank for maintenance, the high-position scarring blocks are not easy to clean and there is a risk of falling, endangering the safety of personnel. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a foam elimination device for the decomposition process of alumina production, which cuts and breaks the bubbles in the slurry through the cutting section in the fin structure. Due to the pressure, the air after the bubbles are broken flows along the guide section to the stirring shaft, and is discharged from the slurry upward along the side wall of the stirring shaft. The elimination of bubbles avoids the generation of foam, effectively inhibits scarring on the tank top, reduces operating risks, improves the safety of maintenance, and improves production continuity.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a foam elimination device for the decomposition process of aluminum oxide production, comprising a decomposition tank, a driving mechanism, a stirring assembly, a plurality of mounting seats and a plurality of fin structures, the stirring assembly comprising a stirring shaft and a stirring blade, the driving mechanism is arranged at the top center position of the decomposition tank and the driving end is fixedly connected to the upper end of the stirring shaft, the stirring shaft penetrates into the decomposition tank and the stirring blade is arranged on the side surface of the stirring shaft, a plurality of fin structures are arranged on the stirring assembly through a plurality of mounting seats in a ring matrix, the fin structure is installed 1 meter below the working liquid level and is located above the stirring blade, the fin structure is a sheet structure and its surface is parallel to the vertical plane, it comprises a guide section and a cutting section, the guide section is trapezoidal and the lower bottom is designed radially outward and axially downward, an empty area is formed between the bottom of the guide section and the side surface of the stirring shaft, so the cutting section is triangular and the tip is designed radially outward, the short side of the triangle is correspondingly connected to the lower bottom of the trapezoid, and the area of ​​the cutting section is 3 times that of the guide section.

[0006] Preferably, the mounting seat is a short piece mounting seat, which is fixedly connected to the trapezoidal upper bottom of the guide section, the short piece mounting seat is provided with a stud connecting hole, the side wall of the stirring shaft is provided with a mounting plate, and the short piece mounting seat is connected to the mounting plate by a stud passing through the stud connecting hole.

[0007] Preferably, the width of the short piece mounting seat is less than one third of the length of the guide section.

[0008] Preferably, the mounting seat is a strip mounting seat, which is fixedly connected to the bottom of the cutting section, and a bolt connection hole is provided on the strip mounting seat. The strip mounting seat is connected to the upper surface of the stirring blade by bolts passing through the bolt connection hole.

[0009] Preferably, a flow area capable of allowing slurry to pass through is provided at the center of the bottom of the cutting section.

[0010] Preferably, the flow area is in the shape of an arc-shaped groove.

[0011] Preferably, the number of the fin structures is 4-8, and the length of each fin structure is 1 / 4-1 / 3 of the radius of the decomposition tank.

[0012] Preferably, the tip of the cutting segment is designed to have an arc angle.

[0013] Preferably, the guide section and the cutting section are integrally formed.

[0014] The present invention provides a foam elimination device for the decomposition process of aluminum oxide production, which has the following beneficial effects: 1. The present invention cuts and breaks the bubbles in the slurry through the cutting section in the fin structure. Due to the pressure, the air after the bubbles are broken flows along the guide section to the stirring shaft, and is discharged upward from the slurry along the side wall of the stirring shaft, reducing the possibility of splashing to the side wall of the decomposition tank when emitting from the working liquid surface. The elimination of bubbles avoids the generation of foam, effectively inhibits scarring on the tank top, reduces operating risks, improves the safety of maintenance, and improves production continuity; 2. When the fin structure is installed on the stirring blade, the present invention sets an arc-shaped groove-shaped circulation area at the bottom of the cutting section to reduce the working pressure of the fin structure and the stirring blade, and at the same time reduce the bubble splashing caused by the excessive resistance of the cutting section. In addition, the design of the circulation area and the arc angle design at one end of the outer side of the cutting section are both for reducing the splashing of bubbles or foam. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the present invention working in a decomposition tank; Figure 2 It is a structural schematic diagram of a fin structure and a mounting seat in a first embodiment of the present invention; Figure 3It is a structural schematic diagram of a fin structure and a mounting seat in a second embodiment of the present invention; Figure 4 This is a schematic diagram of the installation of the mounting base in the first embodiment of the present invention; Figure 5 This is a schematic diagram of the installation of the mounting base in the second embodiment of the present invention; Figure 6 This is a schematic diagram of the first embodiment of the present invention after installation; Figure 7 This is a schematic diagram of the second embodiment of the present invention after installation.

[0016] In the figure: 1. fin structure; 2. decomposition tank; 3. stirring shaft; 4. driving mechanism; 5. stirring blade; 6. guide section; 7. empty area; 8. cutting section; 9. arc angle; 10. short piece mounting seat; 11. circulation area; 12. long strip mounting seat; 13. stud connection hole; 14. bolt connection hole. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] like Figure 1-7As shown, a foam elimination device for the decomposition process of aluminum oxide production includes a decomposition tank 2, a driving mechanism 4, a stirring assembly, a plurality of mounting seats and a plurality of fin structures 1, wherein the stirring assembly includes a stirring shaft 3 and a stirring blade 5, the driving mechanism 4 is arranged at the top center position of the decomposition tank 2 and the driving end is fixedly connected to the upper end of the stirring shaft 3, the stirring shaft 3 penetrates into the decomposition tank 2 and the stirring blade 5 is arranged on the side surface of the stirring shaft 3, a plurality of fin structures 1 are arranged on the stirring assembly through a plurality of mounting seats in a ring matrix, the fin structure 1 is installed 1 meter below the working liquid level and is located above the stirring blade 5, the fin structure 1 is a sheet structure and its surface is parallel to the vertical plane, and it includes a guide section 6 and a cutting section 8, the guide section 6 is trapezoidal and the lower bottom is designed radially outward and axially downward, and an empty area 7 is formed between the bottom of the guide section 6 and the side surface of the stirring shaft 3, so the cutting section 8 is triangular and the tip is designed radially outward, the short side of the triangle is correspondingly connected to the lower base of the trapezoid, and the area of ​​the cutting section 8 is The mounting seat is a short piece mounting seat 10, which is fixedly connected to the trapezoidal upper bottom of the guide section 6, and a stud connection hole 13 is provided on the short piece mounting seat 10. The side wall of the stirring shaft 3 is provided with a mounting plate, and the short piece mounting seat 10 is connected to the mounting plate through a stud penetrating the stud connection hole 13; the width of the short piece mounting seat 10 is less than one-third of the length of the guide section 6; the mounting seat is a long strip mounting seat 12, which is fixedly connected to the bottom of the cutting section 8, and the long strip mounting seat 1 2 is provided with a bolt connection hole 14, and the long strip mounting seat 12 is connected to the upper surface of the stirring blade 5 by bolts passing through the bolt connection hole 14; the center position of the bottom of the cutting section 8 is provided with a flow area 11 that allows the slurry to pass through; the flow area 11 is in the shape of an arc groove; the number of the fin structures 1 is 4-8, and the length of each fin structure 1 is 1 / 4-1 / 3 of the radius of the decomposition tank 2; the tip of the cutting section 8 is designed to be an arc angle 9; the guide section 6 and the cutting section 8 are integrally formed.

[0019] The detailed connection means are well-known in the art. The following mainly introduces the working principle and process, which are as follows: According to the instruction manual Figure 1-7It can be known that the driving mechanism 4 on the decomposition tank 2 in the present invention drives the stirring assembly to rotate, that is, drives the stirring shaft 3 and the stirring blade 5 to rotate, and stirs the aluminum oxide decomposition slurry in the decomposition tank 2, which is the prior art. Since multiple fin structures 1 are arranged on the stirring assembly through multiple mounting seats in an annular matrix, multiple fin structures 1 rotate with the stirring assembly. Since the fin structure 1 has the same rotation speed as the stirring blade 5, but since the stirring blade 5 acts on the slurry, according to common sense, the rotation speed of the slurry to form a smooth flow must be less than the stirring blade 5 and the fin structure 1, so the rotation of the fin structure 1 can act on the slurry. Since the fin structure 1 is a sheet structure and its surface is parallel to the vertical plane, that is, the fin structure 1 stands in the slurry, the fin structure 1 includes a guide section 6 and a cutting section 8, the guide section 6 is a trapezoid and the lower bottom is designed radially outward and axially downward, the cutting section 8 is a triangle and the tip is designed radially outward, the short side of the triangle is correspondingly connected to the lower bottom of the trapezoid, and the surface of the cutting section 8 can beat and cut the bubbles in the slurry to break them. The design of the triangular cutting section 8 is to minimize the components between the slurry and also to have a good effect of cutting and breaking bubbles. The area of ​​the cutting section 8 is three times that of the guide section 6. The purpose is to ensure the cutting effect of the bubbles in the slurry and to guide the air to move to one side of the stirring shaft 3. Specifically, the cutting section 8 is triangular and the tip is designed radially outward. Without considering other factors, due to the high linear velocity of the tip, the greater the force, F decreases from the outside to the inside. The design of the cutting section 8 itself is that the contact area with the slurry is getting larger and larger, that is, S increases from the outside to the inside. Therefore, according to P=F / S, the pressure P is gradually reduced. Therefore, the gas of the bubble breaking is squeezed and moved along the guide section 6, that is, moved toward the stirring shaft 3. The effect of buoyancy and the guidance of the guide section 6 to the stirring shaft 3 will cause the gas to discharge the slurry upward along the surface of the stirring shaft 3. The guide section 6 is trapezoidal and the lower bottom is designed to be radially outward and axially downward. The lower bottom is connected to the cutting section 8, and the upper bottom is inclined toward the stirring shaft 3. The smooth upward design will produce a gap between the guide section 6 and the slurry during operation. With the rise of air, it is guided along the guide section 6 to the stirring shaft 3, so as to be discharged. In addition, an empty area 7 is formed between the bottom of the guide section 6 and the side surface of the stirring shaft 3, and the slurry can pass through the load of the smaller guide area. It should also be understood that for the overall flow field change (normal state) in the decomposition tank 2, according to the Bernoulli principle, the slurry has a smaller pressure at a high flow rate and a larger pressure at a low flow rate. In the rotary stirring motion of the slurry, the rotation of the stirring blade 5 increases the speed of the fluid near the stirring shaft 3 and the stirring blade 5, and the pressure is small, while the slurry speed near the tank wall is relatively small and the pressure is large, so that the bubbles in the decomposition tank 2 flow toward the stirring shaft 3 and flow to the bottom of the fin structure 1. The rising bubbles are cut and broken by the fin structure 1.Therefore, the fin structure 1 needs to be installed above the stirring blade 5, and can be located 1 meter below the working liquid surface. On the one hand, it ensures the stirring of bubbles, and on the other hand, it is convenient to avoid splashing caused by bubble breaking. The present invention cuts and breaks the bubbles in the slurry through the cutting section 8 in the fin structure 1. Due to pressure reasons, the air after the bubble breaking flows along the guide section 6 toward the stirring shaft 3, and is discharged upward from the slurry along the side wall of the stirring shaft 3, reducing the possibility of splashing to the side wall of the decomposition tank 2 when emitting from the working liquid surface. The elimination of bubbles avoids the generation of foam, effectively inhibits scarring on the top of the tank, reduces operating risks, improves the safety of maintenance, and improves production continuity. The mounting seat is a short piece mounting seat 10, which is fixedly connected to the trapezoidal upper bottom of the guide section 6. The short piece mounting seat 10 is provided with a stud connection hole 13, and the side wall of the stirring shaft 3 is provided with a mounting plate. The short piece mounting seat 10 is connected to the mounting plate through a stud penetrating the stud connection hole 13, and is directly mounted on the stirring shaft 3 above the stirring blade 5, reducing the influence of the stirring blade 5 on the slurry forming a flow field. Here, the width of the short piece mounting seat 10 is less than one-third of the length of the guide section 6, reducing the influence on the rise of air.

[0020] Among them, the mounting seat is a long strip mounting seat 12, which is fixedly connected to the bottom of the cutting section 8. The long strip mounting seat 12 is provided with a bolt connection hole 14. The long strip mounting seat 12 is connected to the upper surface of the stirring blade 5 by bolts passing through the bolt connection hole 14. For the cutting section 8 in contact with the slurry, the stability of the cutting section 8 is ensured. In particular, a flow area 11 that allows the slurry to pass through is provided at the center of the bottom of the cutting section 8, which reduces the load of the cutting section 8 while improving the cutting effect and reducing foam splashing. In addition, the flow area 11 is in the shape of an arc groove, and the smooth linear design makes the flow field formed when the slurry passes through more regular, ensuring the stability of the cutting.

[0021] In addition, the length of the fin structure 1 is only 1 / 4-1 / 3 of the radius of the decomposition tank 2, which ensures the crushing of bubbles while reducing the load of the driving mechanism 4. The guide section 6 and the cutting section 8 are integrally formed to increase the strength of the fin structure 1 and improve its service life. The tip of the cutting section 8 is designed to be an arc angle 9 to reduce foam splashing.

[0022] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A foam elimination device for the decomposition process of aluminum oxide production, characterized in that: The invention comprises a decomposition tank (2), a driving mechanism (4), a stirring assembly, a plurality of mounting seats and a plurality of fin structures (1), wherein the stirring assembly comprises a stirring shaft (3) and stirring blades (5), the driving mechanism (4) is arranged at the top center of the decomposition tank (2) and the driving end is fixedly connected to the upper end of the stirring shaft (3), the stirring shaft (3) penetrates into the decomposition tank (2) and the stirring blades (5) are arranged on the side surface of the stirring shaft (3), the plurality of fin structures (1) are arranged on the stirring assembly via a plurality of mounting seats in an annular matrix, and the fin structures (1) are arranged on the stirring assembly. The fin structure (1) is installed 1 meter below the working liquid level and above the stirring blade (5). The fin structure (1) is a sheet structure and its surface is parallel to the vertical plane. It includes a guide section (6) and a cutting section (8). The guide section (6) is trapezoidal and its lower bottom is designed to be radially outward and axially downward. An empty area (7) is formed between the bottom of the guide section (6) and the side surface of the stirring shaft (3). Therefore, the cutting section (8) is triangular and its tip is designed to be radially outward. The short side of the triangle is correspondingly connected to the lower bottom of the trapezoid. The area of ​​the cutting section (8) is three times that of the guide section (6).

2. The foam elimination device for the decomposition process of aluminum oxide production according to claim 1, characterized in that: The mounting seat is a short piece mounting seat (10), which is fixedly connected to the trapezoidal upper bottom of the guide section (6); a stud connection hole (13) is provided on the short piece mounting seat (10); a mounting plate is provided on the side wall of the stirring shaft (3); and the short piece mounting seat (10) is connected to the mounting plate via a stud penetrating the stud connection hole (13).

3. The foam elimination device for the decomposition process of aluminum oxide production according to claim 1, characterized in that: The width of the short piece mounting seat (10) is less than one third of the length of the guide section (6).

4. The foam elimination device for the decomposition process of aluminum oxide production according to claim 1, characterized in that: The mounting seat is a long strip mounting seat (12) which is fixedly connected to the bottom of the cutting section (8). A bolt connection hole (14) is provided on the long strip mounting seat (12). The long strip mounting seat (12) is connected to the upper surface of the stirring blade (5) by means of bolts passing through the bolt connection hole (14).

5. The foam elimination device for the decomposition process of aluminum oxide production according to claim 4, characterized in that: A flow area (11) capable of allowing slurry to pass through is arranged at the center of the bottom of the cutting section (8).

6. The foam elimination device for the decomposition process of aluminum oxide production according to claim 5, characterized in that: The circulation area (11) is in the shape of an arc-shaped groove.

7. The foam elimination device for the decomposition process of aluminum oxide production according to claim 1, characterized in that: The number of the fin structures (1) is 4-8, and the length of each fin structure (1) is 1 / 4-1 / 3 of the radius of the decomposition tank (2).

8. The foam elimination device for the decomposition process of aluminum oxide production according to claim 1, characterized in that: The tip of the cutting section (8) is designed to be a circular arc angle (9).

9. The foam elimination device for the decomposition process of aluminum oxide production according to claim 1, characterized in that: The guide section (6) and the cutting section (8) are integrally formed.

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