Self-dilution flow guide feeding device of settling tank

Abstract

The invention relates to the technical field of hydrometallurgy, in particular to a settling tank self-dilution flow guide feeding device which comprises a columnar feeding well, a raking machine transmission shaft is arranged in the center of the feeding well, the settling tank self-dilution flow guide feeding device further comprises a feeding pipe, the feeding well, a dilution pipe and a flow guide plate, the cross section of the feeding well is in a volute shape, and the feeding pipe is communicated with the inner side of the feeding well through the vertical end face of the feeding well; the side wall of the feeding well is provided with a dilution pipe communicated with the interior of the feeding well, a flow guide plate is arranged in the feeding well and located below the feeding pipe and the dilution pipe, the flow guide plate is in a horn shape with the large end facing upwards, the upper edge of the flow guide plate is connected with the inner wall of the feeding well, the lower edge of the flow guide plate is tightly connected with the raking machine transmission shaft, and the flow guide plate is provided with a plurality of evenly-distributed discharging holes. By arranging the feeding well with the volute-shaped cross section and the inclined flow guide plate, slurry is mixed uniformly, the inclined baffle and the dispersion cone are designed in a combined mode, the uniform mixing effect is further improved, and materials are effectively dispersed.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrometallurgy, and particularly to a self-diluting and diversion feeding device for a settling tank. Background Art

[0002] Solid-liquid separation is an essential step in industrial production such as mineral processing, tailings disposal, hydrometallurgy, oil extraction, papermaking, and wastewater treatment. A settling tank is the most commonly used key equipment for efficient solid-liquid separation. In a settling tank, a feed well is the core that determines the performance of the settling tank. The main function of the feed well is to dissipate the initial kinetic energy of the feed, enabling the flocculant to be fully mixed with the solid-phase particles to form a large-sized and structurally stable particle aggregation group.

[0003] Currently, most feed wells lack necessary buffering and dispersion devices, unable to effectively control the flow of materials, resulting in uneven distribution of materials entering the feed well and causing material short-circuiting. At the same time, the existing feed wells also have the problem that the materials cannot be effectively dispersed at the outlet, leading to low operating efficiency of the settling tank. Summary of the Invention

[0004] In view of the above-mentioned drawbacks and deficiencies of the prior art, the present invention provides a self-diluting and diversion feeding device for a settling tank. By providing a feed well with a volute-shaped cross-section and an inclined deflector plate, the slurry is evenly mixed. In addition, an inclined baffle and a dispersion cone are designed to further improve the mixing effect and effectively disperse the materials.

[0005] To achieve the above object, the main technical solutions adopted by the present invention include: A self-diluting and diversion feeding device for a settling tank, including a columnar feed well. A rake drive shaft is provided at the center of the feed well. It also includes a feed pipe, a feed well, a dilution pipe, and a deflector plate. The cross-section of the feed well is volute-shaped. The feed pipe is connected to the inside of the feed well through the vertical end face of the feed well. The side wall of the feed well is provided with a dilution pipe communicating with the inside of the feed well. A deflector plate is provided inside the feed well. The deflector plate is located below the feed pipe and the dilution pipe. The deflector plate is in the shape of a horn with the large end upward. The upper edge of the deflector plate is connected to the inner wall of the feed well, and the lower edge is closely connected to the rake drive shaft. The deflector plate is provided with a plurality of evenly distributed material discharge holes.

[0006] By providing a feed well with a volute-shaped cross-section and an inclined deflector plate, after the slurry enters the feed well in a tangential direction, it forms a swirling rotational flow along the inner wall of the feed well. As the flow velocity gradually decreases along the rotational path, a reasonable velocity gradient is formed. The volute-shaped wall of the feed well can generate an appropriate shear force on the swirling slurry, which is beneficial for flocculation. Moreover, the combination of the volute-shaped wall of the feed well and the deflector plate structure helps to extend the residence time of the slurry and the flocculant, ensuring full mixing of the slurry and the flocculant.

[0007] By setting a discharge hole on the guide plate, the tangential velocity of the slurry on the guide plate can be converted into a vertical velocity, which effectively reduces the kinetic energy of the mixed slurry and reduces the breakage rate of large flocs.

[0008] Furthermore, the multiple dilution tubes are evenly arranged horizontally along the side wall of the feeding well, and the tangent of the connection point between the dilution tube and the feeding well has an angle of 5 to 15 degrees.

[0009] The dilution pipe allows the clear liquid in the sedimentation tank to enter the feed well through the dilution pipe and mix with the slurry and flocculant, achieving a self-dilution effect inside the feed well. By specifically setting the angle and position of the dilution pipe, the rotational mixing of the clear liquid, slurry and flocculant is more uniform, and the dilution effect is better.

[0010] Furthermore, the angle between the guide plate and the horizontal direction is 10-60 degrees. By limiting the angle of the guide plate, the mixing effect of the raw materials above the guide plate is improved, and the situation of uneven mixing due to excessive feeding is avoided.

[0011] Furthermore, an inclined baffle is provided at the bottom of the feeding well. The inclined baffle is trumpet-shaped with the large end facing upward. The upper edge of the inclined baffle is connected to the bottom edge of the feeding well, and an annular gap is formed between the lower edge and the rake drive shaft.

[0012] By setting an inclined baffle, the mixed slurry on the periphery is introduced into the annular gap in the center. Since the mixed slurry rotates in a vortex shape, the closer to the center it is after passing through the guide plate, the better the mixing effect. The central mixed slurry with relatively better mixing effect is discharged faster under the action of the inclined baffle, while the peripheral mixed slurry can further improve its uniformity during the drainage process of the inclined baffle, thereby improving the overall uniformity of the mixed slurry.

[0013] Furthermore, the angle between the inclined baffle and the horizontal direction is 5-45 degrees. By limiting the angle of the inclined baffle, the mixing effect of the mixed slurry at the inclined baffle is improved.

[0014] Furthermore, a dispersion cone is provided below the feeding well. The dispersion cone is in the shape of a truncated cone with a small end facing upwards. The upper edge of the dispersion cone is tightly connected to the drive shaft of the rake.

[0015] By setting up a dispersion cone, the mixed slurry is dispersed again. The distribution state of the mixed slurry is further optimized during the dispersion process, the uniformity of the distribution of the mixed slurry is improved, the mixed slurry is effectively dispersed, the operation efficiency of the sedimentation tank is improved, and at the same time the flow rate of the slurry is reduced, reducing the impact on the sedimentation layer at the bottom of the sedimentation tank, thereby avoiding damage or disturbance of the sedimentation layer.

[0016] Furthermore, the angle between the dispersion cone and the horizontal direction is 20-60°. By limiting the angle of the dispersion cone, the dispersion effect and mixing effect of the dispersion cone are improved.

[0017] Furthermore, a plurality of flocculant tubes are evenly arranged above the guide plate. The evenly arranged flocculant tubes allow the flocculant to be evenly injected into the feed well, making it easier to mix the slurry. Different types of flocculants can be added to the feed well at multiple points, which can achieve segmented flocculation and improve the flocculation effect.

[0018] The beneficial effects of the present invention are: The self-dilution diversion feeding device of a settling tank of the present invention is provided with a feeding well with a volute-shaped cross section and an inclined guide plate, so that after the slurry enters the feeding well in a tangential direction, it forms a vortex-shaped rotating flow along the inner wall of the feeding well, and the flow velocity gradually decreases along the rotating path, forming a reasonable velocity gradient, and the volute-shaped feeding well wall surface can make the rotating flowing slurry produce a moderate shear force, which is conducive to flocculation. In addition, the volute-shaped feeding well wall surface is combined with the guide plate structure, which helps to prolong the residence time of the slurry and the flocculant, and ensure that the slurry and the flocculant are fully mixed.

[0019] The guide plate is provided with a discharge hole to convert the tangential velocity of the slurry on the guide plate into a vertical velocity, effectively reducing the kinetic energy of the mixed slurry and reducing the breakage rate of large flocs.

[0020] The dilution pipe allows the clear liquid in the sedimentation tank to enter the feed well through the dilution pipe and mix with the slurry and flocculant, achieving a self-dilution effect inside the feed well. By specifically setting the angle and position of the dilution pipe, the rotational mixing of the clear liquid, slurry and flocculant is more uniform, and the dilution effect is better.

[0021] Inclined baffles and dispersion cones are set up to further optimize the distribution state of the mixed slurry, improve the uniformity of the distribution of the mixed slurry, effectively disperse the mixed slurry, improve the operating efficiency of the sedimentation tank, and at the same time reduce the flow rate of the slurry, reduce the impact on the sedimentation layer at the bottom of the sedimentation tank, and avoid damage or disturbance of the sedimentation layer.

[0022] The flocculant tube is set so that the flocculant can be evenly injected into the feeding well, making the slurry easier to mix. At the same time, segmented flocculation can be achieved to improve the flocculation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an axonometric view of the overall structure of a sedimentation tank self-dilution diversion feeding device of the present invention; Figure 2 It is a front view of a sedimentation tank self-dilution diversion feeding device of the present invention; Figure 3 It is a top view of a self-dilution diversion feeding device of a sedimentation tank of the present invention.

[0024] In the figure: 1. feed pipe; 2. feed well; 3. dilution pipe; 4. guide plate; 5. inclined baffle; 6. flocculant pipe; 7. dispersion cone; 8. rake drive shaft. Detailed implementation manners

[0025] For better explaining the present invention for easy understanding, the present invention will be described in detail below in conjunction with the accompanying drawings through specific implementation manners. Among them, the orientation nouns such as "upper" and "lower" mentioned herein are referenced with the orientation of Figure 2 as a reference.

[0026] For better understanding the above technical solution, the exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more clear and thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0027] As Figures 1 - 3 shown, a self-diluting diversion feeding device for a settling tank includes a columnar feeding well 2. A rake drive shaft 8 is arranged at the center of the feeding well 2. It further includes a feed pipe 1, a feeding well 2, a dilution pipe 3, and a diversion plate 4. The cross-section of the feeding well 2 is in a volute shape. The feed pipe 1 is communicated with the inside of the feeding well 2 through the vertical end surface of the feeding well 2. A dilution pipe 3 communicated with the inside of the feeding well 2 is arranged on the side wall of the feeding well 2. A diversion plate 4 is arranged inside the feeding well 2. The diversion plate 4 is arranged below the feed pipe 1 and the dilution pipe 3. The diversion plate 4 is in a horn shape with the large end upward. The upper edge of the diversion plate 4 is connected to the inner wall of the feeding well, and the lower edge is closely connected to the rake drive shaft 8. The diversion plate 4 is provided with a plurality of uniformly distributed blanking holes.

[0028] By providing a feeding well 2 with a volute-shaped cross-section and an inclined diversion plate 4, after the slurry enters the feeding well 2 in a tangential direction, it forms a swirling rotational flow along the inner wall of the feeding well 2. As the flow velocity gradually decreases along the rotational path, a reasonable velocity gradient is formed. The volute-shaped wall surface of the feeding well 2 can generate an appropriate shear force on the swirling slurry, which is beneficial to flocculation. Moreover, the combination of the volute-shaped wall surface of the feeding well 2 and the structure of the diversion plate 4 helps to extend the residence time of the slurry and the flocculant, ensuring sufficient mixing of the slurry and the flocculant.

[0029] By providing blanking holes on the diversion plate 4, the tangential velocity of the slurry on the diversion plate 4 can be converted into a vertical direction, effectively reducing the kinetic energy of the mixed slurry and reducing the breakage rate of large flocculent clusters.

[0030] Specifically, the plurality of dilution pipes 3 are horizontally and uniformly arranged along the side wall of the feeding well 2. The tangential direction of the connection point of the dilution pipe 3 and the feeding well 2 has an included angle of 5-15°.

[0031] The dilution pipe 3 allows the clear liquid in the settling tank to enter the feed well 2 through the dilution pipe 3 and then mix with the slurry and flocculant, achieving the self-dilution effect inside the feed well 2. By specifically setting the angle and position of the dilution pipe 3, the rotational mixing of the clear liquid with the slurry and flocculant is made more uniform, and the dilution effect is better.

[0032] More specifically, the included angle between the dilution pipe 3 and the tangent direction at the connection point with the feed well 2 is preferably 10°.

[0033] Specifically, the included angle between the deflector plate 4 and the horizontal direction is 10° to 60°. By restricting the included angle of the deflector plate 4, the mixing effect of the raw materials above the deflector plate 4 is improved, avoiding the situation of uneven mixing due to too fast feeding.

[0034] More specifically, the included angle between the deflector plate 4 and the horizontal direction is preferably 15° to 45°.

[0035] Specifically, an inclined baffle 5 is provided at the bottom of the feed well 2. The inclined baffle 5 is in the shape of a horn with the large end upward. The upper edge of the inclined baffle 5 is connected to the bottom edge of the feed well 2, and an annular gap is formed between the lower edge and the rake drive shaft 8.

[0036] By setting the inclined baffle 5, the peripheral mixed slurry is introduced into the central annular gap. Since the mixed slurry rotates in a vortex shape, the mixing effect is better at positions closer to the center after passing through the deflector plate 4. These central mixed slurries with relatively better mixing effects are fed faster under the action of the inclined baffle 5, while the peripheral mixed slurry can further improve the uniformity during the diversion process of the inclined baffle 5, thereby improving the overall uniformity of the mixed slurry.

[0037] Specifically, the included angle between the inclined baffle 5 and the horizontal direction is 5° to 45°. By restricting the included angle of the inclined baffle 5, the mixing effect of the mixed slurry at the inclined baffle 5 is improved.

[0038] More specifically, the included angle between the inclined baffle 5 and the horizontal direction is preferably 20° to 45°. Specifically, a dispersion cone 7 is provided below the feed well 2. The dispersion cone 7 is in the shape of a frustum with the small end upward. The upper edge of the dispersion cone 7 is tightly connected to the rake drive shaft 8.

[0039] By setting the dispersion cone 7, the mixed slurry is dispersed again. During the dispersion process, the distribution state of the mixed slurry is further optimized, improving the uniformity of the distribution of the mixed slurry, effectively dispersing the mixed slurry, improving the operating efficiency of the settling tank, reducing the flow rate of the slurry at the same time, and reducing the impact on the sedimentation layer at the bottom of the settling tank to avoid damage or disturbance of the sedimentation layer.

[0040] Specifically, the included angle between the dispersion cone 7 and the horizontal direction is 20° to 60°. By restricting the included angle of the dispersion cone 7, the dispersion effect and mixing effect of the dispersion cone 7 are improved.

[0041] More specifically, the angle between the dispersion cone 7 and the horizontal direction is preferably 30 to 45°.

[0042] Specifically, a plurality of flocculant pipes 6 are uniformly arranged above the flow guide plate 4. By uniformly arranging the flocculant pipes 6, the flocculant can be uniformly injected into the feed well 2, and the slurry is easier to be mixed evenly. Moreover, different types of flocculants can be added to the feed well 2 at multiple points, so as to achieve segmented flocculation and improve the flocculation effect.

[0043] The working process of the present invention: The feeding slurry enters the feed well 2 in a tangential direction through the feed pipe 1 and then forms a vortex-like rotational flow along the inner wall of the feed well 2. The clear liquid in the settling tank enters the feed well 2 through the dilution pipe 3 in a tangential angle direction at the connection point with the feed well 2. The flocculant is injected into the feed well 2 above the feed well 2. At this time, the feeding slurry, the clear liquid and the flocculant rotate rapidly around the rake machine transmission shaft 8 in the feed well 2 to form a mixed slurry.

[0044] The mixed slurry falls along the discharge holes of the flow guide plate 4. When passing through the discharge holes, the tangential velocity of the slurry is converted into a vertical direction, reducing the kinetic energy of the mixed slurry. The mixed slurry in the middle part of the flow guide plate 4 directly falls onto the dispersion cone 7, and the outer part is guided by the inclined baffle 5 and then falls onto the dispersion cone 7, and is mixed evenly again during the guiding process.

[0045] The slurry falling onto the dispersion cone 7 is further mixed evenly, and the kinetic energy is dispersed again by the dispersion cone 7. Finally, it is smoothly and evenly dispersed into the settling tank along the outer edge of the dispersion cone 7 at an appropriate speed.

[0046] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A settling tank self-dilution diversion feeding device, comprising a columnar feeding well (2), wherein a rake drive shaft (8) is provided at the center of the feeding well (2), characterized in that: The invention also comprises a feed pipe (1), a feed well (2), a dilution pipe (3), and a guide plate (4). The cross section of the feed well (2) is in the shape of a volute. The feed pipe (1) is connected to the inner side of the feed well (2) through the vertical end face of the feed well (2). The side wall of the feed well (2) is provided with a dilution pipe (3) connected to the inside of the feed well (2). A guide plate (4) is provided inside the feed well (2). The guide plate (4) is arranged below the feed pipe (1) and the dilution pipe (3). The guide plate (4) is in the shape of a trumpet with the large end facing upward. The upper edge of the guide plate (4) is connected to the inner wall of the feed well, and the lower edge is closely connected to the drive shaft (8) of the rake. The guide plate (4) is provided with a plurality of evenly distributed discharge holes.

2. A sedimentation tank self-dilution diversion feeding device as claimed in claim 1, characterized in that: The plurality of dilution pipes (3) are evenly arranged horizontally along the side wall of the feed well (2), and the tangent direction of the connection point between the dilution pipe (3) and the feed well (2) has an angle of 5 to 15 degrees.

3. A settling tank self-dilution diversion feeding device as claimed in claim 1, characterized in that: The included angle between the guide plate (4) and the horizontal direction is 10-60°.

4. A settling tank self-dilution diversion feeding device as claimed in claim 1, characterized in that: An inclined baffle (5) is provided at the bottom of the feeding well (2). The inclined baffle (5) is trumpet-shaped with the large end facing upwards. The upper edge of the inclined baffle (5) is connected to the bottom edge of the feeding well (2), and an annular gap is formed between the lower edge and the rake drive shaft (8).

5. A settling tank self-dilution diversion feeding device as claimed in claim 4, characterized in that: The angle between the inclined baffle (5) and the horizontal direction is 5-45°.

6. A sedimentation tank self-dilution diversion feeding device as claimed in claim 4, characterized in that: A dispersion cone (7) is provided below the feed well (2). The dispersion cone (7) is in the shape of a truncated cone with the small end facing upwards. The upper edge of the dispersion cone (7) is tightly connected to the rake drive shaft (8).

7. A settling tank self-dilution diversion feeding device as claimed in claim 6, characterized in that: The angle between the dispersion cone (7) and the horizontal direction is 20-60°.

8. A sedimentation tank self-dilution diversion feeding device as claimed in claim 1, characterized in that: A plurality of flocculant tubes (6) are evenly arranged above the guide plate (4).

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