Self-flowing type discharging device of stirring tank
By introducing the deflector plate, compressed air pipe and door structural valve into the agitator discharge device, the problems of large particles deposition and 'scar formation in the alumina production are solved, and more efficient slurry conveying and maintenance are achieved.
Patent Information
- Application Number
- CN202510191339.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-20
- Publication Date
- 2025-04-08
AI Technical Summary
During the alumina production process, the stirring tank cannot achieve complete homogeneity, resulting in large particles deposition and the discharge device cannot be completely transported. The large particles cause 'scars' to form at the bottom of the tank and in the valve track, affecting production.
A stirring tank self-flow discharge device is designed, including a flow guide plate, compressed air pipe and a tap door structural valve. The deflector is composed of arcuate sections and oblique straight sections. The arcuate section faces the direction of slurry flow. The oblique straight section is fixedly connected to the lower end of the arcuate section. The compressed air pipe runs through the deflector. The deflector collects large particles at the bottom and increases the slurry flow through compressed air. The door structure valve adopts a self-weight and self-locking design to avoid the formation of "scars".
Effectively collect and transport large particles deposited at the bottom of the stirring tank to slow down precipitation and build up, delay the generation of "scars", improve the discharge effect, reduce the amount of compressed air, and simplify maintenance to avoid "scars" of the valve.
Smart Images
Figure CN119771257A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of hydrometallurgy, in particular to a self-flowing discharging device for a stirring tank. Background Art
[0002] Pre-desiliconization and decomposition are two key processes in alumina production. Each process has multiple mixing tanks in series. The slurry enters from the top of the first mixing tank and flows out from the bottom of the tank, flowing through each mixing tank in turn. At the same time, sufficient residence and reaction time must be ensured to avoid "short circuit" phenomenon. The slurry is transported between mixing tanks by discharging devices, and valves must be installed on the discharging devices, which need to be controlled by valves during inspection and maintenance.
[0003] In the actual production of alumina, since the mixing tank cannot achieve complete "homogenization", large particles will be deposited at the bottom of the mixing tank, and the discharging device cannot transport all these large particles out. After a long period of production, precipitation will accumulate at the bottom of the tank, forming "scars". Similarly, the valve track of the valve on the discharging chute is a flow "dead zone". After a long period of operation, "scars" will form in the valve track, causing the valve to be unable to close. The valve needs to be cleaned every time the mixing tank is inspected. Summary of the invention
[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a self-flowing discharging device for a stirring tank to solve the problems raised in the above-mentioned background technology.
[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a self-flowing discharging device of a stirring tank, comprising a tank body, a cover plate, a driving mechanism, a stirring assembly, a feed pipe, a discharge pipe, a discharge pipe and a compressed air pipe, the tank body containing slurry to be processed, the cover plate is arranged on the tank body, the drive mechanism is arranged at the center position of the top of the cover plate, the output end of the drive mechanism is connected to the stirring assembly, the stirring assembly can stir the slurry in the tank body, the feed pipe and the discharge pipe are respectively arranged on both sides of the top of the side wall of the tank body, the feed pipe and the discharge pipe are higher than the liquid level of the slurry, the discharge pipe extends into the tank body and is connected to the upper end of the discharge pipe, the lower end of the discharge pipe extends to the bottom of the tank body, the lower end of the discharge pipe is provided with a guide plate, the front side of the guide plate is perpendicular to the flow direction of the slurry when stirring, the compressed air pipe is vertically designed and passes through the cover plate, the lower end of the compressed air pipe passes through the pipe at the bottom of the discharge pipe, and the upper end is connected to an external air compressor, and a valve is provided on the discharge pipe.
[0006] Preferably, the guide plate consists of an arc segment and an oblique straight segment, the upper end of the arc segment is fixedly connected to the lower end of the discharge pipe, the oblique straight segment is fixedly connected to the lower end of the arc segment, and the center line of the oblique straight segment is tangent to the lower end of the arc segment, and the concave surface of the arc segment faces the flow direction of the slurry.
[0007] Preferably, the central angle of the arc segment is 45°-60°, and the horizontal angle between the central line of the oblique straight segment and the bottom of the tank body is 30°-45°.
[0008] Preferably, the width of the bottom of the guide plate is greater than the diameter of the discharge pipe.
[0009] Preferably, the valve is a flap door structure that is self-locking due to its own weight.
[0010] Preferably, the flap door structure includes a frame plate and a baffle door, the frame plate is arranged inside the discharge pipe and fixedly connected to the inside of the discharge pipe, the top of the baffle door is rotatably connected to the frame plate, and the baffle plate can rotate in the direction of slurry flow.
[0011] Preferably, the front and rear side walls of the frame plate are designed with slopes.
[0012] Preferably, the discharge pipe is fixedly connected to the side wall of the trough body via a support member.
[0013] Preferably, the discharge pipe is designed as a V-shaped pipe, and valves are respectively provided on the branch pipes of the V-shaped pipe.
[0014] The present invention provides a self-flowing discharging device for a stirring tank, which has the following beneficial effects: 1. The guide plate of the present invention can collect large particles deposited in the bottom slurry, slow down the accumulation of sediment at the bottom of the tank, and delay the formation of "scarring" at the bottom; 2. The arc section in the guide plate of the present invention can convert part of the kinetic energy of the rotating flowing slurry into kinetic energy of upward flow in the discharge pipe, thereby reducing the amount of compressed air used and improving the discharge effect; 3. The valve on the discharge pipe of the present invention adopts a flap door structure design and a sloped sealing surface, so that no "scar" is produced on the sealing surface, and the "scar" does not need to be cleaned separately during the inspection of the partition tank. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a front cross-sectional view of a stirring tank gravity-flow discharging device of the present invention; Figure 2 This is a schematic diagram of a guide plate of a gravity-flow discharging device of a stirring tank according to the present invention, in the direction of A; Figure 3 It is a schematic diagram of the B direction of a discharge pipe of a gravity-flow discharge device of a stirring tank according to the present invention.
[0016] In the figure: 1. trough body; 2. discharge pipe; 3. guide plate; 4. compressed air pipe; 5. flap door structure; 6. discharge pipe; 7. drive mechanism; 8. stirring assembly; 9. feed pipe; 10. liquid level; 11. support member; 12. cover plate; 31. arc section; 32. oblique straight section; 51. frame plate; 52. baffle door; 511. inclined surface. 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 1-3 As shown, a self-flowing discharging device of a stirring tank comprises a tank body 1, a cover plate 12, a driving mechanism 7, a stirring assembly 8, a feed pipe 9, a discharge pipe 6, a discharge pipe 2 and a compressed air pipe 4. The tank body 1 contains slurry to be processed, the cover plate 12 is covered on the tank body 1, the driving mechanism 7 is arranged at the center of the top of the cover plate 12, the output end of the driving mechanism 7 is connected to the stirring assembly 8, the stirring assembly 8 can stir the slurry in the tank body 1, and the feed pipe 9 and the discharge pipe 6 are respectively arranged on the sides of the tank body 1. On both sides of the top of the wall, the feed pipe 9 and the discharge pipe 6 are higher than the liquid level 10 of the slurry, the discharge pipe 6 extends into the tank body 1 and is connected to the upper end of the discharge pipe 2, the lower end of the discharge pipe 2 extends to the bottom of the tank body 1, the lower end of the discharge pipe 2 is provided with a guide plate 3, the front of the guide plate 3 is perpendicular to the flow direction of the slurry during stirring, the compressed air pipe 4 is vertically designed and passes through the cover plate 12, the lower end of the compressed air pipe 4 passes through the pipe at the bottom of the discharge pipe 2, and the upper end is connected to the external air compressor, and a valve is provided on the discharge pipe 6. The guide plate 3 is composed of an arc segment 31 and an oblique straight segment 32. The upper end of the arc segment 31 is fixedly connected to the lower end of the discharge pipe 2, and the oblique straight segment 32 is fixedly connected to the lower end of the arc segment 31. The center line of the oblique straight segment 32 is tangent to the lower end of the arc segment 31. The concave surface of the arc segment 31 faces the flow direction of the slurry. The center angle of the arc segment 31 is 45°-60°, and the horizontal angle between the center line of the oblique straight segment 32 and the bottom of the tank body 1 is 30°-45°. The width of the bottom of the guide plate 3 is greater than the diameter of the discharge pipe 2. The valve is a flap door structure 5 that relies on its own weight to lock itself; the flap door structure 5 includes a frame plate 51 and a baffle 52, the frame plate 51 is arranged inside the discharge pipe 6 and is fixedly connected to the inside of the discharge pipe 6, the top of the baffle door 52 is rotatably connected to the frame plate 51, and the baffle can rotate in the direction of slurry flow; the front and rear side walls of the frame plate 51 are designed with a slope 511; the discharge pipe 2 is fixedly connected to the side wall of the tank body 1 by a support member 11; the discharge pipe 6 is designed as a V-shaped pipe, and valves are respectively provided on the branch pipes of the V-shaped pipe.
[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 1-3It can be seen that when the present invention is working, slurry is injected into the tank body 1 through the feed pipe 9 until Figure 1 At the position of the liquid level 10 shown, the driving mechanism 7 works to drive the stirring assembly 8 to stir the slurry. The valve on the discharge pipe 6 is opened, and the external air compressor works to introduce air into the discharge pipe 2 through the compressed air pipe 4. The air moves upward in the discharge pipe 2, and the density of the slurry in the discharge pipe 2 decreases. The pressure effect causes the liquid level in the discharge pipe 2 to be higher than the inside of the tank body 1 and enters the discharge pipe 6, and then the slurry is discharged. Since the front of the guide plate 3 at the lower end of the discharge pipe 2 is perpendicular to the flow direction of the slurry during stirring, more slurry will enter the discharge pipe 2 along the guide plate 3, and cooperate with the pressure effect to complete continuous discharge. The way in which the guide plate 3 and the discharge pipe 2 introduce air in the present invention can well collect large particles deposited at the bottom of the slurry, slow down the accumulation of sedimentation at the bottom of the tank, and delay the formation of "scarring" at the bottom.
[0020] Among them, the guide plate 3 is composed of an arc segment 31 and an oblique straight segment 32. The upper end of the arc segment 31 is fixedly connected to the lower end of the discharge pipe 2, and the oblique straight segment 32 is fixedly connected to the lower end of the arc segment 31. The center line of the oblique straight segment 32 is tangent to the lower end of the arc segment 31, and the concave surface of the arc segment 31 faces the flow direction of the slurry. During operation, the slurry is driven by the stirring assembly 8, and its flow will follow the oblique straight segment 32 and the arc segment 31 to the discharge pipe 2, which can better collect large particles deposited at the bottom of the tank body 1, slow down the deposition of particles, and delay the formation of "scars". Its arc-shaped design facing the direction of the slurry opening can convert the kinetic energy of the horizontal flow of the slurry into vertical kinetic energy, help the slurry flow in the discharge pipe 2, improve the discharge effect, and reduce the amount of compressed air used. Here, the central angle of the arc segment 31 can be 45°-60°, the horizontal angle between the center line of the oblique straight segment 32 and the bottom of the trough body 1 is 30°-45°, and the width of the bottom of the guide plate 3 is greater than the diameter of the discharge pipe 2, which can better collect large particles deposited at the bottom of the trough body 1.
[0021] The valve is a flap door structure 5 that is self-locking by its own weight. The flap door structure 5 includes a frame plate 51 and a baffle 52. The frame plate 51 is arranged inside the discharge pipe 6 and is fixedly connected to the inside of the discharge pipe 6. The top of the baffle 52 is rotatably connected to the frame plate 51, and the baffle can rotate in the direction of slurry flow. The structure is simple and convenient for repair and maintenance. Here, the front and rear side walls of the frame plate 51 are designed with inclined surfaces 511, which are conducive to the flow of slurry. Under the action of the inclined surfaces 511, the right-angle "scarring" between the frame plate 51 and the discharge pipe 6 can be avoided.
[0022] Among them, the discharge pipe 2 is fixedly connected to the side wall of the tank body 1 through a support member 11 to improve the stability of the discharge pipe 2 during operation. Here, the discharge pipe 2 can be fixed to the side wall of the tank body 1 by welding a support plate, bolts, etc.
[0023] In addition, the discharge pipe 6 is designed as a V-shaped pipe, and valves are respectively provided on the branch pipes of the V-shaped pipe, which can be opened and closed separately, making it convenient to repair and maintain different tank bodies 1.
[0024] 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 self-flowing discharging device for a stirring tank, characterized in that: The invention comprises a tank body (1), a cover plate (12), a driving mechanism (7), a stirring assembly (8), a feed pipe (9), a discharge pipe (6), a discharge pipe (2) and a compressed air pipe (4); the tank body (1) contains slurry to be processed; the cover plate (12) is arranged on the tank body (1); the driving mechanism (7) is arranged at the center of the top of the cover plate (12); the output end of the driving mechanism (7) is connected to the stirring assembly (8); the stirring assembly (8) can stir the slurry in the tank body (1); the feed pipe (9) and the discharge pipe (6) are respectively arranged at two ends of the top of the side wall of the tank body (1); On the side, the feed pipe (9) and the discharge pipe (6) are higher than the liquid level (10) of the slurry, the discharge pipe (6) extends into the tank body (1) and is connected to the upper end of the discharge pipe (2), the lower end of the discharge pipe (2) extends to the bottom of the tank body (1), the lower end of the discharge pipe (2) is provided with a guide plate (3), the front side of the guide plate (3) is perpendicular to the flow direction of the slurry when it is stirred, the compressed air pipe (4) is designed vertically and passes through the cover plate (12), the lower end of the compressed air pipe (4) passes through the pipe at the bottom of the discharge pipe (2), and the upper end is connected to an external air compressor, and a valve is provided on the discharge pipe (6).
2. A stirring tank self-flowing discharge device according to claim 1, characterized in that: The guide plate (3) is composed of an arc segment (31) and an oblique straight segment (32); the upper end of the arc segment (31) is fixedly connected to the lower end of the discharge pipe (2); the oblique straight segment (32) is fixedly connected to the lower end of the arc segment (31); the center line of the oblique straight segment (32) is tangent to the lower end of the arc segment (31); and the concave surface of the arc segment (31) faces the flow direction of the slurry.
3. A stirring tank self-flowing discharge device according to claim 2, characterized in that: The central angle of the arc section (31) is 45°-60°, and the horizontal angle between the central line of the oblique straight section (32) and the bottom of the tank body (1) is 30°-45°.
4. A stirring tank self-flowing discharge device according to claim 1, characterized in that: The width of the bottom of the guide plate (3) is greater than the diameter of the discharge pipe (2).
5. The self-flowing discharging device of a stirring tank according to claim 1, characterized in that: The valve is a flap door structure (5) that is self-locking by its own weight.
6. A stirring tank self-flowing discharge device according to claim 5, characterized in that: The flap door structure (5) comprises a frame plate (51) and a baffle door (52); the frame plate (51) is arranged inside the discharge pipe (6) and is fixedly connected to the inside of the discharge pipe (6); the top of the baffle door (52) is rotatably connected to the frame plate (51), and the baffle door can rotate in the direction of slurry flow.
7. A stirring tank self-flowing discharge device according to claim 6, characterized in that: The front and rear side walls of the frame plate (51) are designed with inclined surfaces (511).
8. The self-flowing discharging device of a stirring tank according to claim 1, characterized in that: The discharge pipe (2) is fixedly connected to the side wall of the tank body (1) via a support member (11).
9. A stirring tank self-flowing discharge device according to claim 1, characterized in that: The discharge pipe (6) is designed as a V-shaped pipe, and valves are respectively arranged on the bifurcated pipes of the V-shaped pipe.