A settling tank mixing and feeding device

Abstract

The application discloses a kind of sedimentation tank mixed feeders, it is related to the technical field of alumina production equipment, including slurry initial mixing part, slurry dispersion part, flocculation premixing part, flocculation second mixing part, confluence part, slurry initial mixing part includes initial mixing tank, worm type flow passage is arranged in initial mixing tank, slurry dispersion part includes the flow dividing cylinder of fixedly connected in the center of initial mixing tank bottom, flocculation premixing part includes a plurality of premixing cylinder fixedly arranged in the outside of flow dividing cylinder, flocculation second mixing part includes a plurality of mixing cylinder fixedly arranged in the outside of flow dividing cylinder, confluence part includes a plurality of confluence cylinder one and confluence cylinder;The application is by setting slurry initial mixing part, slurry dispersion part, flocculation premixing part, flocculation second mixing part and confluence part, traditional " one pot " type mixing is decomposed into " pre-homogenization-shunt premixing-dilution mixing-gentle confluence " progressive process, and this " first division later total " spatial layout improves the uniformity and stability of final mixing quality.

Description

Technical Field

[0001] This invention relates to the field of alumina production equipment technology, specifically to a settling tank mixing and feeding device. Background Technology

[0002] Red mud settling is a crucial step in the Bayer process for alumina production. Its core principle is to accelerate the settling of fine red mud particles by adding flocculants. In practice, the slurry entering the settling tank typically consists of multiple streams with varying properties, including the separation underflow, washing overflow, and filter cake. Therefore, thoroughly mixing and homogenizing these raw material slurries before adding the flocculant is essential to ensuring stable and efficient subsequent flocculation.

[0003] For example, patent CN118949492A discloses a spiral belt plate self-mixing feeding device, including a feed pipe, a mixing cylinder, a spiral guide plate, a conical constriction, a feeding cone, and a flocculant pipe. This device introduces multiple streams of slurry and flocculant into a single mixing chamber, mainly relying on the swirling flow generated by tangential feeding and the internal guide plate to achieve single-stage, high-shear-strength mixing.

[0004] However, existing devices often combine or simplify the two steps of "mixing between raw material slurries" and "mixing of slurry and flocculant", resulting in multiple raw material slurries coming into contact with flocculant before homogenization is achieved. At the same time, existing technologies mostly adopt a "one-pot" single-stage mixing process, which leads to unstable flocculation effect and low sedimentation efficiency. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a settling tank mixing and feeding device, which solves the technical problem of unstable flocculation effect in existing devices.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: a settling tank mixing and feeding device, comprising a slurry initial mixing section, a slurry dispersion section, a flocculation premixing section, a flocculation secondary mixing section, and a merging section;

[0007] The slurry initial mixing section includes an initial mixing tank, and a volute flow channel is provided inside the initial mixing tank. Multiple turbulence baffles are fixedly provided on the side wall of the volute flow channel.

[0008] The slurry dispersion section includes a diversion cylinder fixedly connected to the center of the bottom of the primary mixing tank. The slurry discharged from the outlet end of the volute can enter the diversion cylinder. The diversion cylinder has two sets of equal numbers of diversion ports I and II on its side wall.

[0009] The flocculation premixing section includes multiple premixing cylinders fixedly disposed outside the diversion cylinder, the number of the multiple premixing cylinders being equal to the number of the multiple diversion ports, and each premixing cylinder being fixedly disposed with an injection pipe.

[0010] The flocculation mixing section includes multiple mixing cylinders fixedly disposed outside the diversion cylinder, the number of the multiple mixing cylinders being equal to the number of the multiple diversion ports, and the bottom of the premixing cylinder being connected to the top of the mixing cylinder through a through hole;

[0011] The merging section includes multiple merging cylinders 1 and merging cylinder 2. The top of each merging cylinder 1 is connected to the bottom of two adjacent mixing cylinders. The top of each merging cylinder 2 is connected to the bottom of multiple merging cylinders 1. A discharge port is provided at the bottom of each merging cylinder 2.

[0012] Preferably, the volute flow channel has a rectangular cross-section, and the inlet end of the volute flow channel is provided with a feed port. The feed port is provided with at least one slurry flow channel with a rectangular cross-section arranged along the width direction of the volute flow channel. Each slurry flow channel is connected to a reducing pipe, one end of which is rectangular and the other end is circular.

[0013] Preferably, the number of diversion ports in each group is not less than six and the number is an even number.

[0014] Preferably, the inside of the diversion cylinder is provided with a flow regulating cylinder that can slide along its axial direction. By moving the flow regulating cylinder up and down, the first diversion port and the second diversion port can be blocked, thereby adjusting the flow rate of the slurry in the first diversion port and the second diversion port.

[0015] Preferably, a stirring shaft sleeve is fixedly installed at the center of the diversion cylinder, and a lifting cylinder is slidably installed on the outside of the stirring shaft sleeve. The diversion cylinder is fixedly connected to the bottom of the lifting cylinder through multiple connecting rods. A portal frame is fixedly installed on the initial mixing tank, and a telescopic rod is fixedly installed on the portal frame. The telescopic end of the telescopic rod is fixedly connected to the top of the lifting cylinder.

[0016] Preferably, the top of the stirring shaft sleeve is fixedly connected to the gantry frame.

[0017] Preferably, a flocculant distribution pipe is fixedly installed on the outside of the plurality of premixing cylinders, one end of the injection pipe extends into the interior of the premixing cylinder, the other end of the injection pipe is connected to the flocculant distribution pipe, and the flocculant distribution pipe is connected to an inlet pipe.

[0018] Preferably, the first diversion port is tangentially connected to the side wall of the premixing cylinder, and the second diversion port is tangentially connected to the side wall of the mixing cylinder.

[0019] Preferably, a dispersion cone is fixedly provided at the bottom of the discharge port.

[0020] This invention provides a settling tank mixing and feeding device, which has the following beneficial effects:

[0021] 1. By setting up a slurry initial mixing section, a slurry dispersion section, a flocculation premixing section, a flocculation secondary mixing section, and a merging section, the traditional "one-pot" mixing is decomposed into a progressive process of "pre-homogenization - split premixing - dilution mixing - smooth merging". This "separate before total" spatial layout allows each mixing stage to be carried out under optimal conditions, improving the uniformity and stability of the final mixing quality.

[0022] 2. The homogenized slurry can be distributed to the premixing and secondary mixing sections according to a preset ratio through the slurry dispersion section. At the same time, the flocculant is discharged into each premixing cylinder for high-concentration initial mixing to form a "mother liquor". By setting up multiple premixing cylinders, the flocculant is dispersed and injected. Subsequently, the "mother liquor" is diluted and blended with a large amount of untreated slurry in the mixing cylinder. This two-stage gradient dispersion mode from "concentrated" to "dilute" greatly promotes the full extension and uniform distribution of flocculant molecules, avoids local over-concentration or over-dilute, and significantly improves the utilization efficiency of flocculant.

[0023] 3. Through the synergistic effect of the volute flow channel and the baffle strip, the raw material slurry from multiple sources with different properties is fully and gently pre-homogenized and mixed. This ensures that the slurry entering the subsequent flocculation process has uniform properties and eliminates the interference of feed fluctuations on the flocculation effect, laying a solid foundation for obtaining stable and high-quality flocs (lumps).

[0024] 4. The ratio of slurry entering the flocculation premixing section and the flocculation secondary mixing section can be adjusted by the sliding flow regulating cylinder, so that the device can flexibly adapt to changes in upstream feed or different production needs, thereby enhancing the system's resistance to fluctuations and its controllability. Attached Figure Description

[0025] Figure 1 The three-dimensional representation of the present invention Figure 1 ;

[0026] Figure 2 The three-dimensional representation of the present invention Figure 2 ;

[0027] Figure 3 This is the front view of the present invention;

[0028] Figure 4 This is a schematic diagram of the internal structure of the present invention from the front view.

[0029] Figure 5 for Figure 3 A three-dimensional sectional view at point AA;

[0030] Figure 6 for Figure 3 A three-dimensional sectional view at point BB;

[0031] Figure 7 for Figure 3A three-dimensional sectional view at point CC;

[0032] Figure 8 This is a schematic diagram of the internal structure of the slurry initial mixing section, slurry dispersion section, flocculation premixing section, and flocculation secondary mixing section;

[0033] Figure 9 This is a schematic diagram of the internal structure of the confluence section.

[0034] In the diagram: 1. Initial mixing tank; 2. Spiral flow channel; 3. Feed inlet; 4. Slurry flow channel; 5. Variable diameter pipe; 6. Baffle strip; 7. Diverter cylinder; 8. Premixing cylinder; 9. Diverter port one; 10. Mixing cylinder; 11. Diverter port two; 12. Through hole; 13. Flocculant distribution pipe; 14. Injection pipe; 15. Inlet pipe; 16. Confluence cylinder one; 17. Confluence cylinder two; 18. Discharge port; 19. Dispersion cone; 20. Flow regulating cylinder; 21. Stirring shaft sleeve; 22. Lifting cylinder; 23. Connecting rod; 24. Gantry frame; 25. Telescopic rod. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0036] Please see Figures 1-9 The present invention provides a technical solution: a settling tank mixing and feeding device, comprising a slurry initial mixing section, a slurry dispersion section, a flocculation premixing section, a flocculation secondary mixing section, and a confluence section;

[0037] The slurry initial mixing section includes an initial mixing tank 1, a volute flow channel 2 is provided in the initial mixing tank 1, and multiple turbulence baffles 6 are fixedly provided on the side wall of the volute flow channel 2. When multiple different slurries flow in the volute flow channel 2, each turbulence baffle 6 can generate vortices in the slurry, thereby achieving mixing of multiple slurries. When the slurry flows out of the volute flow channel 2, the primary mixing of the slurry is achieved.

[0038] The slurry dispersion section includes a diversion cylinder 7 fixedly connected to the center of the bottom of the primary mixing tank 1. The slurry discharged from the outlet end of the volute channel 2 can enter the diversion cylinder 7. The diversion cylinder 7 has two sets of equal numbers of diversion ports 1 9 and diversion ports 2 11 on its side wall. Through the multiple diversion ports 1 9, a portion of the slurry can be divided into multiple streams and enter the flocculation premixing section. Through the multiple diversion ports 2 11, another portion of the slurry can be divided into multiple streams and enter the flocculation secondary mixing section.

[0039] The flocculation premixing section includes multiple premixing cylinders 8 fixedly disposed outside the distribution cylinder 7. The number of premixing cylinders 8 is equal to the number of distribution ports 9. The distribution ports 9 are tangent to the premixing cylinders 8, so that eddies can be generated when the slurry enters the premixing cylinders 8, which facilitates the mixing of the slurry. Flocculant distribution pipes 13 are fixedly disposed outside the multiple premixing cylinders 8. Multiple injection pipes 14 that can extend into the premixing cylinders 8 are fixedly connected to the flocculant distribution pipes 13. The flocculant distribution pipes 13 are connected to inlet pipes 15. The flocculant enters the flocculant distribution pipes 13 through the inlet pipes 15, and then enters each premixing cylinder 8 through each injection pipe 14 to mix with the rotating slurry inside, thereby achieving the premixing of the slurry.

[0040] The flocculation mixing section includes multiple mixing cylinders 10 fixedly disposed outside the diversion cylinder 7. The number of multiple mixing cylinders 10 is equal to the number of multiple diversion ports 11. The diversion ports 11 are tangent to the mixing cylinders 10, so that eddies can be generated when the slurry enters the mixing cylinders 10, which facilitates the mixing of the slurry. The bottom of the premixing cylinder 8 is connected to the top of the mixing cylinder 10 through a through hole 12. The slurry that has been premixed in the premixing cylinder 8 can enter the mixing cylinder 10 through the through hole 12 and be mixed with the slurry again to achieve further dispersion of the flocculant.

[0041] The merging section includes multiple merging cylinders 16 and merging cylinder 17. The top of each merging cylinder 16 is connected to the bottom of two adjacent mixing cylinders 10. The slurry mixed in the two adjacent mixing cylinders 10 can be collected through the merging cylinder 16 to achieve the first merging. The top of the merging cylinder 17 is connected to the bottom of multiple merging cylinders 16. The slurry discharged from multiple merging cylinders 16 can be collected through the merging cylinder 17 to achieve the final merging. The bottom of the merging cylinder 17 is provided with a discharge port 18 for discharging slurry. A dispersion cone 19 is fixedly provided at the bottom of the discharge port 18 to disperse the discharged slurry.

[0042] As an embodiment of the present invention, please refer to Figure 5 The volute 2 has a rectangular cross-section and an inlet 3 at its inlet end. Inside the inlet 3, there are at least one slurry channel 4 with a rectangular cross-section arranged along the width direction of the volute 2. Each slurry channel 4 is connected to a reducing pipe 5. One end of the reducing pipe 5 is rectangular and the other end is circular. The circular end of each reducing pipe 5 is used to connect to an external feed pipe, and the rectangular end is connected to the corresponding rectangular cross-section slurry channel 4. This converts multiple circular pipe flows into parallel rectangular thin-layer flows, reducing the thickness of each slurry and facilitating the mixing of different slurries.

[0043] As an embodiment of the present invention, each group of outflow ports has no less than six and the number is an even number.

[0044] As an embodiment of the present invention, the diversion cylinder 7 is provided with a flow regulating cylinder 20 that can slide along its axial direction. By moving the flow regulating cylinder 20 up and down, the first diversion port 9 and the second diversion port 11 can be blocked, thereby adjusting the flow rate of the slurry in the first diversion port 9 and the second diversion port 11, and realizing the adjustment of the ratio of slurry entering the first diversion port 9 and the second diversion port 11.

[0045] As an embodiment of the present invention, a stirring shaft sleeve 21 for installing the stirring shaft of the settling tank is fixedly installed at the center of the diversion cylinder 7. A lifting cylinder 22 is slidably installed on the outside of the stirring shaft sleeve 21. The flow regulating cylinder 20 is fixedly connected to the bottom of the lifting cylinder 22 by multiple connecting rods 23. A gantry frame 24 is fixedly installed on the initial mixing tank 1. A telescopic rod 25 is fixedly installed on the gantry frame 24. The telescopic rod 25 can be an electric push rod. The telescopic end of the telescopic rod 25 is fixedly connected to the top of the lifting cylinder 22. The lifting cylinder 22 can be pushed by the telescopic rod 25, and the flow regulating cylinder 20 can be moved up and down by the lifting cylinder 22.

[0046] As an embodiment of the present invention, the top of the stirring shaft sleeve 21 is fixedly connected to the portal frame 24 to improve the strength of the stirring shaft sleeve 21.

[0047] The working principle and usage process of this invention are as follows: In use, multiple streams of different slurries enter the inlet 3 through the reducer 5. The slurry flow channel 4 then guides these streams into the volute flow channel 2 in a layered structure. The slurry flow channel 4 reduces the thickness of each slurry stream, facilitating mixing between layers. As the slurry flows within the volute flow channel 2, the baffles 6 create eddies, promoting initial mixing of the multiple slurries. The volute flow channel 2 allows for pre-mixing of the slurry before it combines with the flocculant, advancing the necessary high-intensity mixing process. The flocculation mixing stage can adopt a low-shear mode to reduce the destruction of flocs. After preliminary mixing, the slurry enters the distribution cylinder 7. A portion of the slurry enters the premixing cylinder 8 through the first distribution port 9. Simultaneously, flocculant can be injected into each premixing cylinder 8 through the injection pipe 14. The slurry mixes with the flocculant in the premixing cylinder 8 to form a premixed slurry. Another portion of the slurry in the distribution cylinder 7 enters the mixing cylinder 10 through the second distribution port 11, where it mixes with the premixed slurry discharged through the through hole 12, achieving further diffusion and concentration homogenization of the flocculant in all the slurries. Multiple premixing cylinders 8 and multiple mixing cylinders 10 enable split-flow dosing and mixing, improving the dispersion effect of flocculants. By setting up premixing cylinders 8, the flocculant and slurry can be premixed. The premixed slurry undergoes secondary mixing in the mixing cylinder 10, improving the mixing quality. When it is necessary to adjust the ratio of premixed slurry to mixed slurry, the height of the regulating cylinder 20 can be changed via the telescopic rod 25. Adjusting the height of the regulating cylinder 20 simultaneously changes the size of the openings of the first and second branch outlets 9 and 11, thereby adjusting the ratio of premixed slurry to mixed slurry discharged from the branch outlet 7. After secondary mixing, the slurry enters the confluence section. Each confluence cylinder 16 can merge the slurry discharged from two mixing cylinders 10. The confluence cylinder 2 17 can merge the slurry discharged from multiple confluence cylinders 16. Finally, the slurry is discharged into the settling tank through the discharge port 18 at the bottom. The confluence section re-merges the multiple streams of slurry, allowing them to gradually and smoothly converge at lower relative flow rates and shear forces. This effectively protects the formed alum body structure, makes the flocculant mixing inside the slurry more uniform, and improves the mixing effect of the flocculant.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A settling tank mixing and feeding device, characterized in that, It includes the slurry initial mixing section, slurry dispersion section, flocculation premixing section, flocculation secondary mixing section, and confluence section; The slurry initial mixing section includes an initial mixing tank (1), and a volute flow channel (2) is provided inside the initial mixing tank (1). Multiple turbulence baffles (6) are fixedly provided on the side wall of the volute flow channel (2). The slurry dispersion section includes a diversion cylinder (7) fixedly connected to the center of the bottom of the primary mixing tank (1). The slurry discharged from the outlet end of the volute channel (2) can enter the diversion cylinder (7). The diversion cylinder (7) has two sets of equal numbers of diversion ports one (9) and multiple diversion ports two (11) on its side wall. The flocculation premixing section includes a plurality of premixing cylinders (8) fixedly disposed outside the diversion cylinder (7). The number of the plurality of premixing cylinders (8) is equal to the number of the plurality of diversion ports (9). Each premixing cylinder (8) is fixedly disposed with an injection pipe (14). The flocculation mixing section includes multiple mixing cylinders (10) fixedly disposed outside the diversion cylinder (7). The number of multiple mixing cylinders (10) is equal to the number of multiple diversion ports (11). The bottom of the premixing cylinder (8) is connected to the top of the mixing cylinder (10) through a through hole (12). The merging section includes multiple merging cylinders one (16) and merging cylinder two (17). The top of each merging cylinder one (16) is connected to the bottom of two adjacent mixing cylinders (10). The top of the merging cylinder two (17) is connected to the bottom of multiple merging cylinders one (16). The bottom of the merging cylinder two (17) is provided with a discharge port (18). The first diversion port (9) is tangentially connected to the side wall of the premixing cylinder (8), and the second diversion port (11) is tangentially connected to the side wall of the mixing cylinder (10).

2. The settling tank mixing and feeding device according to claim 1, characterized in that, The volute flow channel (2) has a rectangular cross-section. The inlet end of the volute flow channel (2) is provided with a feed port (3). The feed port (3) is provided with at least one slurry flow channel (4) with a rectangular cross-section arranged along the width direction of the volute flow channel (2). Each slurry flow channel (4) is connected to a reducing pipe (5). One end of the reducing pipe (5) is rectangular and the other end is circular.

3. The settling tank mixing and feeding device according to claim 1, characterized in that, The number of diversion ports in each group shall be no less than six and shall be an even number.

4. The settling tank mixing and feeding device according to claim 3, characterized in that, The diversion cylinder (7) is equipped with a flow regulating cylinder (20) that can slide along its axial direction. By moving the flow regulating cylinder (20) up and down, the first diversion port (9) and the second diversion port (11) can be blocked, thereby adjusting the flow rate of the slurry in the first diversion port (9) and the second diversion port (11).

5. A settling tank mixing and feeding device according to claim 4, characterized in that, A stirring shaft sleeve (21) is fixedly installed at the center of the diversion cylinder (7). A lifting cylinder (22) is slidably installed on the outside of the stirring shaft sleeve (21). The flow regulating cylinder (20) is fixedly connected to the bottom of the lifting cylinder (22) through multiple connecting rods (23). A portal frame (24) is fixedly installed on the initial mixing tank (1). A telescopic rod (25) is fixedly installed on the portal frame (24). The telescopic end of the telescopic rod (25) is fixedly connected to the top of the lifting cylinder (22).

6. A settling tank mixing and feeding device according to claim 5, characterized in that, The top of the stirring shaft sleeve (21) is fixedly connected to the gantry frame (24).

7. A settling tank mixing and feeding device according to claim 1, characterized in that, A flocculant distribution pipe (13) is fixedly installed on the outside of a plurality of premixing cylinders (8). One end of the injection pipe (14) extends into the interior of the premixing cylinder (8), and the other end of the injection pipe (14) is connected to the flocculant distribution pipe (13). The flocculant distribution pipe (13) is connected to an inlet pipe (15).

8. A settling tank mixing and feeding device according to claim 1, characterized in that, A dispersion cone (19) is fixedly installed at the bottom of the discharge port (18).

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