Thickening device for refined phosphoric ore pulp

Abstract

The utility model discloses a thickening device for refined phosphoric ore pulp, and belongs to the technical field of thickeners. Comprising a tank body, an ore feeding pipe, an overflow weir at the top of the tank body, a discharge port at the bottom of the tank body, a bridge frame at the top of the tank body, a guide cylinder at the center of the tank body, a rotating shaft which downwards penetrates through the guide cylinder and is coaxially arranged with the tank body, and a rotating rake which is arranged at the lower part of the rotating shaft and is matched with the bottom of the tank body, wherein the guide cylinder and the rotating shaft are coaxially arranged and are positioned at the upper part in the tank body; the feeding pipe is tangentially connected with the lower part of the guide cylinder, the upper part in the guide cylinder is provided with an aeration stirring structure, the bottom of the guide cylinder is provided with a through hole for the rotating shaft to penetrate through, the rotating shaft is coaxially provided with a conical guide plate, and the conical guide plate is positioned between the guide cylinder and the rotating rake and is in a big-end-down conical shape; the aeration stirring structure comprises a plurality of aeration pipes which are uniformly distributed around the rotating shaft; the lower end of the aeration pipe extends to the upper part in the guide cylinder and is arranged close to the inner wall of the guide cylinder.

Description

Technical Field

[0001] This utility model belongs to the field of thickening technology, and specifically relates to a thickening device for refined phosphate slurry. Background Technology

[0002] A thickener is a solid-liquid separation device based on gravity settling. Generally, it uses the action of a slowly rotating rake installed inside the thickener to discharge the thickened underflow slurry from the underflow port at the bottom of the thickener.

[0003] In phosphoric acid beneficiation, the concentrate slurry after flotation needs to be concentrated using a thickener. For example, patent application number CN201520004578.4 discloses a high-efficiency cyclone deep cone thickener, including a transmission device, a bridge frame, a thickening tank, a rotating shaft, a rotating rake, a cyclone drum, an overflow weir, an overflow pipe, a feed pipe, and a bottom flow pipe. The upper part of the thickening tank is cylindrical, and the lower part is an inverted cone. The cyclone drum is fixed in the middle of the thickening tank by two fixing plates, and the top of the cyclone drum is sealed. The feed pipe is tangentially connected to the cyclone drum. A bridge frame is provided at the top of the thickening tank, and the transmission device is supported on the bridge frame. The top of the rotating shaft is connected to the transmission device, and the bottom end is connected to the rotating rake. An overflow weir surrounds the top of the thickening tank, and the overflow pipe is connected to the overflow weir. The bottom flow pipe is connected to the bottom of the thickening tank.

[0004] When the concentrate is thickened, flocculants are typically added to the concentrate slurry to improve settling. In existing technologies (such as those described in application number CN201521079461.9), flocculants can be added to the defoaming tank. However, the mixing effect between the flocculant and the concentrate slurry is poor. Existing technologies may use a stirrer mounted on a rotating shaft and located inside a guide tube to thoroughly mix the flocculant with the concentrate slurry. Typically, the concentrate slurry is tangentially fed into the guide tube through a feed pipe, allowing it to swirl within the guide tube to improve settling.

[0005] The applicant discovered the following problems when using the aforementioned thickener to process the concentrate slurry:

[0006] (1) Mechanical rotation stirring can easily disrupt the vortex of concentrate slurry, reduce the settling effect, and prolong the hydraulic residence time;

[0007] (2) The rotating shaft is mainly used to drive the rotating rake to rotate, and cannot adjust the mixing effect of flocculant and concentrate slurry; at the same time, the rotating rake rotates slowly and the mixing effect is also average. Summary of the Invention

[0008] To address the aforementioned problems, this utility model provides a thickening device for refined phosphate slurry. The slurry is tangentially input into the lower part of the guide cylinder, and an aeration and stirring structure mixes the slurry in the upper part of the guide cylinder, allowing the swirling current and aeration to mix and separate. The aeration and stirring structure inputs compressed air at multiple points, which has less impact on the swirling current compared to mechanical stirring, ensuring the settling effect of the thickener. Simultaneously, the aeration and stirring structure is easy to control and can be controlled separately from the rotary rake. The technical solution is as follows:

[0009] This utility model provides a thickening device for refined phosphate slurry, including a tank body 1, a feed pipe 8, an overflow weir 2 at the top of the tank body 1, a discharge port 3 at the bottom of the tank body 1, a bridge frame 4 at the top of the tank body 1, a guide cylinder 5 at the center of the tank body 1, a rotating shaft 6 that passes downward through the guide cylinder 5 and is coaxial with the tank body 1, and a rotating rake 7 at the lower part of the rotating shaft 6 that cooperates with the bottom of the tank body 1. The guide cylinder 5 is coaxial with the rotating shaft 6 and is located in the upper part of the tank body 1; the feed pipe 8 and the lower part of the guide cylinder 5 are coaxial with the rotating shaft 6 and are located in the upper part of the tank body 1. The guide tube 5 is tangentially connected to the guide tube. The upper part of the guide tube 5 is provided with an aeration and stirring structure 9 and the bottom of the guide tube 5 is provided with a through hole for the rotating shaft 6 to pass through. The rotating shaft 6 is coaxially provided with a conical guide plate 10. The conical guide plate 10 is located between the guide tube 5 and the rotating rake 7 and is a cone shape with a smaller top and a larger bottom. The aeration and stirring structure 9 includes multiple aeration pipes 94 evenly distributed around the rotating shaft 6. The aeration pipes 94 are set vertically downward, with their lower ends reaching the upper part of the guide tube 5 and being set close to the inner wall of the guide tube 5.

[0010] In this embodiment of the invention, the bottom of the pool body 1 is conical, and the cone angle of the conical bottom is 145-155°.

[0011] Specifically, in this embodiment of the utility model, the bridge frame 4 is arranged radially along the pool body 1; the feed pipe 8 is arranged along the direction of the bridge frame 4, located on the upper side of the bridge frame 4, with its inner end bent downward and connected to the guide tube 5, and its outer end connected to the defoaming tank 11.

[0012] In this embodiment of the invention, the aeration and stirring structure 9 includes an air inlet main pipe 91, an annular distribution pipe 92, a fixed support 93, and multiple aeration pipes 94. The air inlet main pipe 91 and the annular distribution pipe 92 are both located directly above the bridge frame 4. The air inlet main pipe 91 is arranged along the direction of the bridge frame 4, with its outer end connected to the compressed air supply structure and its inner end connected to the annular distribution pipe 92. The annular distribution pipe 92 is coaxially arranged outside the rotating shaft 6. The fixed support 93 is fixed to the lower side of the bridge frame 4 and is located above the liquid surface. The aeration pipe 94 is equipped with a valve 95, the upper end of which is connected to the lower side of the annular distribution pipe 92, and the middle part is fixed to the fixed support 93. The valve 95 is located on the upper part of the aeration pipe 94, above the bridge frame 4, and the distance between the valve and the bridge frame 4 is 0.5-1.0m.

[0013] Specifically, in this embodiment of the present invention, the compressed air supply structure is located on the upper side of the cable tray 4 and on the side of the guide tube 5 away from the defoaming tank 11.

[0014] Furthermore, in this embodiment of the utility model, the lower side of the cable tray 4 is provided with a return pipe 12 along its direction; the return pipe 12 is provided with a pump, the outer end of which is bent downward to below the liquid surface and is located near the overflow weir 2, and the inner end of which is directly above the guide tube 5.

[0015] In this embodiment of the utility model, the guide tube 5 is a cylindrical structure with end faces on both the upper and lower sides. The center of the upper and lower end faces is provided with a through hole for the rotating shaft 6 to pass through, and the outer edge of the bottom is beveled. There is an annular gap between the through hole and the rotating shaft 6.

[0016] Specifically, in this embodiment of the present invention, the diameter of the pool body 1 is 20-30m, the diameter of the guide tube 5 is 4-5m, the cone angle of the conical guide plate 10 is 100-135°, the diameter of its bottom is 1.8-2.5m, and the distance between its top and the guide tube 5 is 1.0-1.5m.

[0017] The beneficial effects of the technical solution provided by this utility model embodiment are as follows: This utility model embodiment provides a thickening device for refined phosphate slurry. The refined slurry is tangentially input at the lower part of the guide cylinder, and the aeration and stirring structure mixes the refined slurry at the upper part of the guide cylinder, allowing the vortex and aeration to mix and separate. The aeration and stirring structure inputs compressed air at multiple points, which has less impact on the vortex compared to mechanical stirring, ensuring the settling effect of the thickener (hydraulic retention time is 3-5% less than that of the prior art (mixing by mechanical stirring)). At the same time, the aeration and stirring structure is easy to control and can be controlled separately from the rotary rake. The conical guide plate reduces the impact of the aeration and stirring structure on the slurry at the bottom of the tank. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the thickening device for refined phosphate slurry provided in this embodiment of the utility model;

[0019] Figure 2 yes Figure 1 A magnified view of a portion of the image.

[0020] In the diagram: 1. Pool body, 2. Overflow weir, 3. Discharge port, 4. Bridge frame, 5. Guide cylinder, 6. Rotary shaft, 7. Rotary rake, 8. Feed pipe, 9. Aeration and mixing structure, 10. Conical guide plate, 11. Defoaming tank, 12. Return pipe;

[0021] 91 Main intake pipe, 92 Annular distribution pipe, 93 Fixed bracket, 94 Aeration pipe, 95 Valve. Detailed Implementation

[0022] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0023] Example 1

[0024] See Figure 1 and 2Example 1 provides a thickening device for refined phosphate slurry, including a tank body 1, a feed pipe 8, an overflow weir 2, a discharge port 3, a bridge frame 4, a guide cylinder 5, a rotating shaft 6, a drive structure, a rotating rake 7, an aeration and stirring structure 9, a conical guide plate 10, and a return pipe 12. The tank body 1 is vertically arranged and has a cylindrical structure with a conical bottom. The cone angle of the conical bottom is 145-155°. The overflow weir 2 is located on the outer top of the tank body 1, coaxial with the tank body 1, and has an annular trough structure, from which clear water overflows. The bridge frame 4 is located at the top of the tank body 1, radially arranged along the tank body 1, with both ends fixed to the top of the tank body 1. The guide cylinder 5 is fixed in the middle of the bridge frame 4, located at the upper center of the tank body 1. It is coaxial with the tank body 1 and has a cylindrical structure with end faces on both the upper and lower sides. A through hole for the rotating shaft 6 to pass through is located at the center of both end faces, and the bottom outer edge is beveled. The upper end face of the guide cylinder 5 can be used to fix the aeration pipe 94, which has a through hole for the aeration pipe 94 to pass through. The lower end face of the guide cylinder 5 can extend the residence time of the slurry in the guide cylinder 5, reducing the impact of the aeration and stirring structure 9 on the lower part of the tank body 1, and guiding the slurry towards the conical guide plate 10. The rotating shaft 6 is rotatably mounted on the bridge frame 4, with its upper part located inside the guide cylinder 5. It is coaxial with the tank body 1 and has an annular gap between itself and the through hole. The drive structure is fixed to the upper side of the bridge frame 4 and is connected to the upper end of the rotating shaft 6, driving the rotating rake 7 to rotate. A rotating rake 7 is located at the lower part of the rotating shaft 6 and fits into the bottom of the tank body 1. A feed pipe 8 is installed along the direction of the bridge frame 4, located on the upper side of the bridge frame 4. Its inner end is bent downwards and connected to the guide cylinder 5, its outer end is connected to the defoaming tank 11 (located beside the tank body 1), and its inner end is tangentially connected to the lower part of the guide cylinder 5. An aeration and stirring structure 9 is located in the upper part of the guide cylinder 5 and is used to mix the concentrate slurry with the flocculant. The aeration and stirring structure 9 includes multiple aeration pipes 94 evenly distributed around the rotating shaft 6. The aeration pipes 94 are vertically downwards, with their lower ends extending to the upper part of the guide cylinder 5 and below the liquid surface, close to the inner wall of the guide cylinder 5. A conical guide plate 10 is coaxially mounted in the middle of the rotating shaft 6, located between the guide cylinder 5 and the rotating rake 7. It is a cone shape with a smaller top and a larger bottom, and is used to guide the concentrate slurry (from the annular gap of the guide cylinder 5, reducing disturbance to the bottom sediment (the aeration and stirring structure 9 will disturb the concentrate slurry)). The return pipe 12 is located on the lower side of the bridge frame 4, and is arranged along the direction of the bridge frame 4. A pump (not shown) is mounted on it. Its outer end bends downward to below the liquid surface and is located near the overflow weir 2. Its inner end extends to the top of the guide cylinder 5 to deliver clean water into the guide cylinder 5. It is used to return clean water to the guide cylinder 5 to adjust the density of the liquid in the guide cylinder 5.

[0025] Specifically, in this embodiment of the present invention, the diameter of the pool body 1 is 20-30m, and the diameter of the guide tube 5 is 4-5m. The cone angle of the conical guide plate 10 is 100-135°, the diameter of its bottom is 1.8-2.5m, and the distance between its top and the guide tube 5 is 1.0-1.5m.

[0026] Example 2

[0027] See Figure 1 and 2 Example 2 provides a thickening device for refined phosphate slurry, whose structure is basically the same as that of Example 1, except that the aeration and stirring structure 9 in this example includes an air inlet main pipe 91, an annular distribution pipe 92, a fixed support 93, and multiple (specifically 4-12) aeration pipes 94. The air inlet main pipe 91 and the annular distribution pipe 92 are both located directly above the bridge frame 4. The air inlet main pipe 91 is arranged along the direction of the bridge frame 4, with its outer end connected to a compressed air supply structure (not shown) and its inner end connected to the annular distribution pipe 92. The annular distribution pipe 92 is coaxially arranged outside the rotating shaft 6, and the fixed support 93 (specifically an annular structure) is fixed to the lower side of the bridge frame 4 and is located above the liquid surface. The aeration pipe 94 is equipped with a valve 95 (used to control the aeration volume and the degree of disturbance to the concentrate slurry), the upper end of which is connected to the lower side of the annular distribution pipe 92, and the middle part is fixed to the fixed support 93. Valve 95 is located on the upper part of aeration pipe 94, above cable tray 4, at a distance of 0.5-1.0m from cable tray 4 for easy operation. Specifically, the compressed air supply structure is located on the upper side of cable tray 4 and on the side of guide tube 5 away from defoaming tank 11.

[0028] Example 3

[0029] Example 3 provides a thickening device for refined phosphate slurry, whose structure is basically the same as that of Example 1, except that: the diameter of the pool 1 in this example is 24m, its height (including the conical bottom) is 11.5m, and the cone angle at the bottom is 150°. The diameter of the guide tube 5 is 4.4m, its height is 2.4m, and its top is 0.2m above the liquid surface. The cone angle of the conical guide plate 10 is 120°, its bottom diameter is 2.2m, and the distance between its top and the guide tube 5 is 1.35m. There are 6 aeration pipes 94, the lower end of which is 0.9m below the liquid surface, its diameter is 33mm, and the distance between it and the inner wall of the guide tube 5 is 500mm. The diameter of the feed pipe 8 is 380mm, and the distance between it and the lower end of the aeration pipe 94 is 100mm. The width of the annular gap is 120mm.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A thickening device for refined phosphate slurry, comprising a tank body (1), a feed pipe (8), an overflow weir (2) at the top of the tank body (1), a discharge port (3) at the bottom of the tank body (1), a bridge frame (4) at the top of the tank body (1), a guide cylinder (5) at the center of the tank body (1), a rotating shaft (6) passing downward through the guide cylinder (5) and coaxially arranged with the tank body (1), and a rotating rake (7) at the lower part of the rotating shaft (6) and cooperating with the bottom of the tank body (1), wherein the guide cylinder (5) is coaxially arranged with the rotating shaft (6) and is located in the upper part of the tank body (1); characterized in that, The feed pipe (8) is tangentially connected to the lower part of the guide cylinder (5). The upper part of the guide cylinder (5) is provided with an aeration and stirring structure (9) and the bottom of the guide cylinder (5) is provided with a through hole for the rotating shaft (6) to pass through. A conical guide plate (10) is coaxially provided on the rotating shaft (6). The conical guide plate (10) is located between the guide cylinder (5) and the rotating rake (7) and it is a cone shape with a smaller top and a larger bottom. The aeration and stirring structure (9) includes multiple aeration pipes (94) evenly distributed around the rotating shaft (6). The aeration pipes (94) are set vertically downward, with their lower ends reaching the upper part of the guide cylinder (5) and set close to the inner wall of the guide cylinder (5).

2. The thickening device for refined phosphate slurry according to claim 1, characterized in that, The bottom of the pool body (1) is conical, and the cone angle of the conical bottom is 145-155°.

3. The thickening device for refined phosphate slurry according to claim 1, characterized in that, The bridge (4) is arranged radially along the pool body (1); the feed pipe (8) is arranged along the direction of the bridge (4), located on the upper side of the bridge (4), with its inner end bent downward and connected to the guide tube (5), and its outer end connected to the defoaming tank (11).

4. The thickening device for refined phosphate slurry according to claim 3, characterized in that, The aeration and stirring structure (9) includes an air inlet main pipe (91), an annular distribution pipe (92), a fixed support (93), and multiple aeration pipes (94). The air inlet main pipe (91) and the annular distribution pipe (92) are both located directly above the bridge frame (4). The air inlet main pipe (91) is arranged along the direction of the bridge frame (4), with its outer end connected to the compressed air supply structure and its inner end connected to the annular distribution pipe (92). The annular distribution pipe (92) is coaxially arranged outside the rotating shaft (6). The fixed support (93) is fixed on the lower side of the bridge frame (4) and is located above the liquid surface. The aeration pipe (94) is equipped with a valve (95), the upper end of which is connected to the lower side of the annular distribution pipe (92), and the middle part is fixed on the fixed support (93). The valve (95) is located on the upper part of the aeration pipe (94), above the bridge frame (4), and the distance between it and the bridge frame (4) is 0.5-1.0m.

5. The thickening apparatus for refined phosphate slurry according to claim 3, characterized in that, The compressed air supply structure is located on the upper side of the cable tray (4) and on the side of the guide tube (5) away from the defoaming tank (11).

6. The thickening apparatus for refined phosphate slurry according to claim 3, characterized in that, The lower side of the bridge (4) is provided with a return pipe (12) along its direction; the return pipe (12) is provided with a pump, the outer end of which is bent downward to below the liquid surface and is set close to the overflow weir (2), and the inner end of which is directly above the guide tube (5).

7. The thickening apparatus for refined phosphate slurry according to claim 1, characterized in that, The guide tube (5) is a cylindrical structure with end faces on both the upper and lower sides. A through hole for the rotating shaft (6) to pass through is provided at the center of the upper and lower end faces. The bottom outer edge is beveled. There is an annular gap between the through hole and the rotating shaft (6).

8. The thickening apparatus for refined phosphate slurry according to claim 1, characterized in that, The diameter of the pool body (1) is 20-30m, the diameter of the guide tube (5) is 4-5m; the cone angle of the conical guide plate (10) is 100-135°, the diameter of its bottom is 1.8-2.5m, and the distance between its top and the guide tube (5) is 1.0-1.5m.

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