Foam eliminating device for decomposition process in aluminum oxide production
By using a finned cutting section to cut bubbles and designing a flow guide section to discharge gas in the alumina production decomposition process, the problem of scaling on the tank top was solved, and the continuity and safety of production were improved.
Patent Information
- Application Number
- CN202422623822.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2034-10-30
AI Technical Summary
The generation of large amounts of foam in the alumina production decomposition process leads to scaling on the tank top, affecting production continuity and posing safety hazards, which are difficult to eliminate effectively with existing technologies.
The cutting section in the fin structure cuts and breaks up the air bubbles in the slurry. The air after the bubbles are broken flows along the guide section to the stirring shaft and is discharged from the slurry. The design of the flow area and the rounded corner reduces splashing and suppresses foam generation.
It effectively inhibits scaling on the tank top, reduces operational risks, improves production continuity and maintenance safety, and reduces foam splashing.
Smart Images
Figure CN223874505U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to foams eliminate device technical field, specifically is a kind of alumina production decomposition procedure foams eliminate device. BACKGROUND
[0002] High consumption, high organic matter content, most organic matter is separated after dissolution, sedimentation, into the slurry of decomposition procedure, leading to slurry stickiness increase, easy to produce bubble;Meanwhile in the decomposition process, the impact of feed slurry in the descending process in decomposition tank is easy to produce bubble;In the process of stirring, it will cause air to mix into slurry, also promote bubble production. Multiple bubbles gather and form foam.
[0003] Large amount of foam will gather on the top of decomposition tank, gradually adhere to the side wall and top support beam, form high position scab. After high position scab block falls off, it is easy to accumulate at the bottom, can cause harm to stirring system, affect continuous production;When cleaning tank overhauls, high position scab block is not easy to clean, and there is falling risk, endanger personnel safety. SUMMARY
[0004] In view of the above insufficient of prior art, the utility model provides a kind of alumina production decomposition procedure foams eliminate device, cut the bubble in slurry by cutting section in fin structure, due to pressure, air after bubble breakage flows along flow guide section to stirring shaft, and is discharged from slurry along the side wall of stirring shaft upwards, the elimination of bubble avoids the generation of foam, effectively inhibits scab on the top of tank, reduces operation risk, improves the safety of overhaul, improves production continuity.
[0005] To achieve the above object, the utility model is realized by the following technical scheme: a kind of alumina production decomposition procedure foams eliminate device, including decomposition tank, drive mechanism, stirring assembly, multiple mounting seats and multiple fin structures, the stirring assembly includes stirring shaft and stirring paddle, the drive mechanism is set at the top center position of decomposition tank and the driving end is fixedly connected with the upper end of stirring shaft, stirring shaft penetrates to the inside of decomposition tank and stirring paddle is arranged on the side surface of stirring shaft, multiple fin structures are arranged on stirring assembly by multiple mounting seats annular matrix, the fin structure is installed below 1 meter of working liquid level and is located above stirring paddle, fin structure is sheet structure and its surface is parallel to vertical plane, and it includes flow guide section and cutting section, the flow guide section is trapezoidal and lower base is designed along the radial direction outward, axially downward, and the bottom of flow guide section and the side surface of stirring shaft form empty area, so the cutting section is triangular and the tip is designed along the radial direction outward, the short side of triangle is connected with the lower base of trapezoidal, the area of cutting section is 3 times of flow guide section.
[0006] Preferably, the mounting seat is a short piece mounting seat, which is fixedly connected with the upper base of the trapezoidal flow guide section, and a threaded stud connecting hole is arranged on the short piece mounting seat; a mounting piece is arranged on the side wall of the stirring shaft, and the short piece mounting seat is connected with the mounting piece through the threaded stud penetrating the threaded stud connecting hole.
[0007] Preferably, the width of the short piece mounting seat is less than one third of the length of the flow guide section.
[0008] Preferably, the mounting seat is a long strip mounting seat, which is fixedly connected with the bottom of the cutting section, and a bolt connecting hole is arranged on the long strip mounting seat; the long strip mounting seat is connected with the upper surface of the stirring paddle through the bolt penetrating the bolt connecting hole.
[0009] Preferably, a flow-through area allowing the slurry to pass through is arranged at the center position of the bottom of the cutting section.
[0010] Preferably, the flow-through area is in an arc-shaped groove shape.
[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 section is designed as a circular arc angle.
[0013] Preferably, the flow guide section and the cutting section are designed as an integral molding.
[0014] The utility model provides a kind of foaming elimination device for decomposition process of alumina production, with the following beneficial effects:
[0015] 1. The utility model cuts and breaks the bubble in slurry by the cutting section in fin structure, due to pressure, the air after bubble breaking flows along flow guide section to stirring shaft, and is discharged from slurry along the side wall of stirring shaft upwards, reduce the possibility of splashing to decomposition tank side wall when emerging working liquid surface, the elimination of bubble avoids the generation of foam, effectively inhibits scab on tank top, reduces operation risk, improves the security of overhaul, improves production continuity;
[0016] 2. The utility model sets up arc-shaped groove-shaped flow-through area in cutting section bottom when fin structure is installed on stirring paddle, reduce the working pressure of fin structure and stirring paddle, while reduce bubble splashing caused by too large cutting section resistance.In addition, the design of flow-through area, cutting section outer side one end design as circular arc angle are all to reduce bubble or foam splashing. DRAWINGS
[0017] Figure 1 for the working schematic diagram of the utility model in decomposition tank;
[0018] Figure 2Structure schematic view of fin structure and mounting seat in the first embodiment of the present application;
[0019] Figure 3 Structure schematic view of fin structure and mounting seat in the second embodiment of the present application;
[0020] Figure 4 Mounting schematic view of mounting seat in the first embodiment of the present application;
[0021] Figure 5 Mounting schematic view of mounting seat in the second embodiment of the present application;
[0022] Figure 6 Schematic view after mounting in the first embodiment of the present application;
[0023] Figure 7 Schematic view after mounting in the second embodiment of the present application.
[0024] In the drawing: 1, fin structure; 2, decomposition groove; 3, stirring shaft; 4, driving mechanism; 5, stirring paddle; 6, flow guide section; 7, empty area; 8, cutting section; 9, circular arc angle; 10, short piece mounting seat; 11, flow-through area; 12, long strip mounting seat; 13, stud connecting hole; 14, bolt connecting hole. DETAILED DESCRIPTION
[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0026] As Figures 1-7As shown, a kind of foam elimination device of bauxite production decomposition process, including decomposition tank 2, drive mechanism 4, stirring assembly, multiple mounting seats and multiple fin structures 1, the stirring assembly includes stirring shaft 3 and stirring paddle 5, the drive mechanism 4 is arranged at the top center position of decomposition tank 2 and the driving end is fixedly connected with the upper end of stirring shaft 3, stirring shaft 3 penetrates to the inside of decomposition tank 2 and stirring paddle 5 is arranged on the side surface of stirring shaft 3, multiple fin structures 1 are arranged on stirring assembly by multiple mounting seats annular matrix, the fin structure 1 is installed below 1 meter of working liquid level and above stirring paddle 5, fin structure 1 is sheet structure and its surface is parallel to vertical plane, and it includes flow guide section 6 and cutting section 8, the flow guide section 6 is trapezoidal and the lower base is designed along the radial outward, axially downward, and the bottom of flow guide section 6 and the side surface of stirring shaft 3 form empty area 7, so that the cutting section 8 is triangular and the tip is designed along the radial outward, the short side of triangle is connected with the lower base of trapezoid, and the area of cutting section 8 is 3 times of flow guide section 6;The mounting seat is short piece mounting seat 10, which is fixedly connected with the upper base of flow guide section 6, and the short piece mounting seat 10 is provided with stud connecting hole 13, and the side wall of stirring shaft 3 is provided with mounting piece, and the short piece mounting seat 10 is connected with the mounting piece by penetrating stud connecting hole 13 with stud;The width of short piece mounting seat 10 is less than one third of the length of flow guide section 6;The mounting seat is long strip mounting seat 12, which is fixedly connected with the bottom of cutting section 8, and the long strip mounting seat 12 is provided with bolt connecting hole 14, and the long strip mounting seat 12 is connected with the upper surface of stirring paddle 5 by penetrating bolt connecting hole 14 with bolt;The bottom center position of cutting section 8 is provided with flow-through area 11 that can allow slurry to pass through;The flow-through area 11 is arc-shaped groove shape;The number of fin structures 1 is 4-8, and the length of each fin structure 1 is 1 / 4-1 / 3 of the radius of decomposition tank 2;The tip of cutting section 8 is designed as arc angle 9;Flow guide section 6 and cutting section 8 are integrally formed.
[0027] Detailed connection means, for the art known technology, the following mainly introduces working principle and process, as follows:
[0028] According to the description attached Figures 1-7It can be known that the driving mechanism 4 on the decomposition tank 2 drives the stirring assembly to rotate, namely drives the stirring shaft 3 and the stirring paddle 5 to rotate, and the alumina decomposition slurry in the decomposition tank 2 is stirred. The multiple fin structures 1 are arranged on the stirring assembly in a ring matrix through multiple mounting seats, so that the multiple fin structures 1 rotate with the stirring assembly. The fin structure 1 has the same rotating speed as the stirring paddle 5, but the stirring paddle 5 acts on the slurry, according to common sense, the rotating speed of the slurry is smaller than that of the stirring paddle 5 and the fin structure 1, so that the fin structure 1 can act on the slurry. The fin structure 1 is a sheet structure, and the surface thereof is parallel to the vertical surface, namely the fin structure 1 stands in the slurry, the fin structure 1 comprises a flow guide section 6 and a cutting section 8, the flow guide section 6 is trapezoidal, the lower base thereof is designed to be outward along the radial direction and downward along the axial direction, the cutting section 8 is triangular, the tip thereof is designed to be outward along the radial direction, the short side of the triangular shape is connected with the lower base of the trapezoidal shape in correspondence, and the surface of the cutting section 8 can beat and cut the bubbles in the slurry to break them. The triangular cutting section 8 is designed to be as small as possible to the components between the slurry, and also has a good effect of cutting and breaking the bubbles. The area of the cutting section 8 is 3 times that of the flow guide section 6, and the purpose is to ensure the cutting effect of the bubbles in the slurry, and to guide the air to move to the side of the stirring shaft 3. Specifically, the cutting section 8 is triangular, and the tip thereof is designed to be outward along the radial direction. Without considering other factors, since the linear speed of the tip is large, the stress is large, so that F is reduced from outside to inside, the design of the cutting section 8 itself, the contact area with the slurry is larger and larger, namely S is increased from outside to inside, so that, according to P=F / S, the pressure P is gradually reduced, so that the gas broken by the bubbles is extruded and moves along the flow guide section 6, namely moves to the stirring shaft 3. The action of the buoyancy and the guidance of the flow guide section 6 to the stirring shaft 3 can make the gas move upward along the surface of the stirring shaft 3 to discharge the slurry. The flow guide section 6 is trapezoidal, the lower base thereof is designed to be outward along the radial direction and downward along the axial direction, the lower base is connected with the cutting section 8, the upper base is inclined to the stirring shaft 3, and the design is smooth upward. The flow guide section 6 works with the slurry to form a gap, cooperates with the upward air, and is guided along the flow guide section 6 to the stirring shaft 3, so as to be discharged. In addition, the flow guide section 6 forms an empty area 7 between the bottom thereof and the side surface of the stirring shaft 3, and the slurry can pass through the small flow guide area. It should be understood that, for the overall flow field change (normal state) in the decomposition tank 2, according to Bernoulli's principle, the pressure of the slurry is small in the place with large flow velocity, and the pressure is large in the place with small flow velocity. In the rotating stirring movement of the slurry, the rotation of the stirring paddle 5 increases the speed of the fluid near the stirring shaft 3 and the stirring paddle 5, and the pressure is small, and the speed of the slurry near the tank wall is relatively small, and the pressure is large, so that the bubbles in the decomposition tank 2 flow to the stirring shaft 3, flow below the fin structure 1, and the bubbles rising are cut and broken by the fin structure 1.Therefore, the fin structure 1 needs to be installed above the stirring paddle 5, at 1 meter below the working liquid surface, which can ensure the crushing of the bubbles and avoid the splashing caused by the broken bubbles. The bubbles in the slurry are cut and broken by the cutting section 8 in the fin structure 1. Due to the pressure, the air after the bubble breaking flows along the flow guide section 6 to the stirring shaft 3, and is discharged from the slurry along the side wall of the stirring shaft 3, which reduces the possibility of splashing to the side wall of the decomposition tank 2 when it rises above the working liquid surface. The elimination of bubbles avoids the generation of foam, effectively inhibits the scab on the tank top, reduces the operation risk, improves the safety of maintenance, and improves the production continuity.
[0029] The mounting seat is a short piece mounting seat 10, which is fixedly connected with the upper base of the trapezoidal flow guide section 6. The short piece mounting seat 10 is provided with a stud connecting hole 13. The side wall of the stirring shaft 3 is provided with a mounting piece. The short piece mounting seat 10 is connected with the mounting piece through the stud penetrating the stud connecting hole 13, and is directly installed on the stirring shaft 3 above the stirring paddle 5, which reduces the influence on the slurry flow field formed by the stirring paddle 5. Here, the width of the short piece mounting seat 10 is less than one third of the length of the flow guide section 6, which reduces the influence on the rising air.
[0030] The mounting seat is a long strip mounting seat 12, which is fixedly connected with the bottom of the cutting section 8. The long strip mounting seat 12 is provided with a bolt connecting hole 14. The long strip mounting seat 12 is connected with the upper surface of the stirring paddle 5 through the bolt penetrating the bolt connecting hole 14, which ensures the stability of the cutting section 8 which contacts with the slurry. In particular, the bottom center of the cutting section 8 is provided with a flow-through area 11 which allows the slurry to pass through, which reduces the load of the cutting section 8 while improving the cutting effect and reducing the splashing of foam. In addition, the flow-through area 11 is in the form of an arc-shaped groove, and the smooth linear design makes the flow field formed by the slurry more regular, ensuring the stability of the cutting.
[0031] In addition, the length of the fin structure 1 is 1 / 4-1 / 3 of the radius of the decomposition tank 2, which can ensure the crushing of the bubbles while reducing the load of the driving mechanism 4. The flow guide section 6 and the cutting section 8 are designed in one piece, which increases the strength of the fin structure 1 and improves the service life. The tip of the cutting section 8 is designed as a circular arc corner 9, which reduces the splashing of foam.
[0032] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.
Claims
1. An apparatus for eliminating foam in a decomposition process of an alumina production process, characterized by, The application relates to a slurry decomposition tank, which 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 is fixedly connected with the upper end of the stirring shaft (3) at the driving end, the stirring shaft (3) penetrates into the interior of 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 in the form of a ring matrix through the plurality of mounting seats, the fin structures (1) are installed below the working liquid surface by 1m and above the stirring blades (5), the fin structure (1) is a sheet structure and the surface thereof is parallel to the vertical surface, the fin structure (1) comprises a flow guide section (6) and a cutting section (8), the flow guide section (6) is trapezoidal and is designed in a mode that the lower base is outward along the radial direction and downward along the axial direction, an empty area (7) is formed between the bottom of the flow guide section (6) and the side surface of the stirring shaft (3), therefore the cutting section (8) is triangular and the tip is designed in a mode that the tip is outward along the radial direction, the short side of the triangle is connected with the lower base of the trapezoid in correspondence, and the area of the cutting section (8) is 3 times that of the flow guide section (6).
2. The apparatus for eliminating foam in a decomposition process of an alumina production process according to claim 1, characterized by, The mounting seat is a short sheet mounting seat (10) which is fixedly connected with the upper base of the flow guide section (6), screw column connecting holes (13) are arranged on the short sheet mounting seat (10), the side wall of the stirring shaft (3) is provided with a mounting sheet, and the short sheet mounting seat (10) is connected with the mounting sheet through screw columns penetrating the screw column connecting holes (13).
3. A device for eliminating foam in a decomposition process of an alumina production according to claim 2, characterized in that, The width of the short sheet mounting seat (10) is less than one third of the length of the flow guide section (6).
4. The apparatus for eliminating foam in a decomposition process of an alumina production process according to claim 1, characterized by The mounting seat is a long strip mounting seat (12) which is fixedly connected with the bottom of the cutting section (8), bolt connecting holes (14) are arranged on the long strip mounting seat (12), and the long strip mounting seat (12) is connected with the upper surface of the stirring blade (5) through bolts penetrating the bolt connecting holes (14).
5. A froth elimination device for a Bayer process digestion circuit for the production of alumina as claimed in claim 4 wherein, A flow-through area (11) allowing slurry to pass through is arranged at the center of the bottom of the cutting section (8).
6. A froth elimination device for a Bayer process digestion circuit for the production of alumina as claimed in claim 5 wherein, The flow-through area (11) is in the form of an arc-shaped groove.
7. The apparatus for eliminating foam in a decomposition process of an alumina production process according to claim 1, characterized by 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 apparatus for eliminating foam in a decomposition process of an alumina production process according to claim 1, characterized by, The tip of the cutting section (8) is designed as a circular arc corner (9).
9. The apparatus for eliminating foam in a decomposition process of an alumina production according to claim 1, wherein The flow guide section (6) and the cutting section (8) are integrally formed.