Settling tank self-dilution feeding device for aluminum oxide production

Abstract

The invention relates to the technical field of settling devices, and particularly discloses a settling tank self-dilution feeding device for aluminum oxide production, which comprises a feeding pipe connected with a settling tank, a water spraying device arranged in the feeding pipe, and a water supply device arranged on the lower side of the feeding pipe, the water supply device is connected with the water spraying device; the water spraying device comprises a plurality of sleeves vertically arranged in the feeding pipe, first water spraying holes formed in the sleeves, water spraying pipes arranged in the sleeves and second water spraying holes formed in the side walls of the water spraying pipes; the water supply device comprises a water supply tank arranged below the feeding pipe, a water supply pipe connected with the water supply tank and a water pump connected with the water supply pipe; the lower end of the spray pipe communicates with the water supply tank. According to the settling tank self-dilution feeding device for aluminum oxide production, slurry can be effectively diluted before entering the settling tank, and the settling efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sedimentation devices, and more particularly, to a self-diluting feeding device for a thickener used in alumina production. Background Art

[0002] A thickener is a gravity sedimentation device for solid-liquid separation, also known as a thickener or clarifier, which is used to increase the concentration of a suspension and obtain a clarified liquid at the same time. The thickener is a commonly used device for the separation and sedimentation of red mud in alumina production. The digested pulp enters the dilution tank and is mixed with the washing liquid from the first-stage washing tank of sedimentation to obtain a diluted pulp. The diluted pulp is sent to the separation thickener for sedimentation separation. The underflow after sedimentation separation is subjected to 4-5 times of reverse washing to remove the useful components in the red mud, and the red mud is stacked after being filtered by a filter press.

[0003] In actual production, the solid content of the thickener feed has a very obvious impact on the productivity of the thickener and the operating stability of the thickener. The higher the solid content of the thickener feed, the worse the sedimentation effect of the red mud in the thickener. Therefore, reducing the solid content of the thickener feed is of great significance for the stable operation of the red mud separation and washing in alumina production. Summary of the Invention

[0004] The purpose of the present invention is to provide a self-diluting feeding device for a thickener used in alumina production, which can effectively dilute the slurry before it enters the thickener and improve the sedimentation efficiency.

[0005] The present invention is realized through the following technical solutions: The self-diluting feeding device for a thickener used in alumina production of the present invention includes a feeding pipe connected to the thickener, a water spraying device provided inside the feeding pipe, and a water supply device provided below the feeding pipe; the water supply device is connected to the water spraying device; the water spraying device includes a plurality of sleeves vertically provided in the feeding pipe, first water spraying holes opened on the sleeves, a water spraying pipe provided inside the sleeves, and second water spraying holes opened on the side wall of the water spraying pipe; the water supply device includes a water supply tank provided below the feeding pipe, a water supply pipe connected to the water supply tank, and a water pump connected to the water supply pipe; the lower end of the water spraying pipe is communicated with the water supply tank.

[0006] Further, the water supply device further includes a driving device provided in the water supply tank, the driving device is connected to the lower end of the water spraying pipe, and the driving device is used to drive the water spraying pipe to rotate, and the first water spraying holes correspond to the second water spraying holes one by one.

[0007] Further, the driving device includes a cover body covering the inner top wall of the water supply tank, a water inlet pipe provided on the side wall of the cover body, a blocking rod slidably provided in the water inlet pipe, a rack connected to one end of the blocking rod inside the cover body, a first spring connected to the rack, and a gear provided at the lower end of the water spraying pipe; both the gear and the lower end of the water spraying pipe are provided in the cover body, and the gear meshes with the rack.

[0008] Further, a part of the water inlet pipe is provided inside the cover body; a water inlet hole is provided on the side wall of one end of the water inlet pipe provided inside the cover body.

[0009] Further, a limiting pipe is provided on one side of the inside of the cover body away from the water inlet pipe, a limiting rod is provided at one end of the rack away from the blocking rod, and the limiting rod is slidably provided in the limiting pipe;

[0010] The axes of the water inlet pipe, the blocking rod, the limiting rod, and the limiting pipe coincide.

[0011] Further, an annular fixing ring is provided on the outer wall of the limiting pipe, and the first spring is sleeved on the outer walls of both the limiting rod and the limiting pipe at the same time; one end of the first spring away from the rack is fixedly connected to the fixing ring.

[0012] Further, the water spraying device further includes a floating plate provided above the sleeve, and a plurality of sliding holes provided on the lower side of the floating plate; one of the sleeves is slidably provided in one of the sliding holes; the density of the floating plate is less than the density of water; the floating plate is provided in the feed pipe, and the upper ends of both the sleeve and the water spraying pipe are sealed ends.

[0013] Further, both lower sides of the two ends of the floating plate are arc-shaped.

[0014] Further, a vertical sliding rod is provided on the upper side of the floating plate, and a second spring is sleeved on the outer wall of the sliding rod; the upper end of the sliding rod passes through the feed pipe and is slidably connected to the feed pipe, one end of the second spring is fixedly connected to the upper end of the sliding rod, and the other end is fixedly connected to the outer top wall of the feed pipe.

[0015] The technical solution of the present invention has at least the following advantages and beneficial effects: For the self-diluting feeding device of the settling tank for alumina production of the present invention, when in use, the slurry is fed into the feeding pipe, and the slurry is fed into the sedimentation tank through the feeding pipe for sedimentation. During the feeding process, it is necessary to keep the solid content of the slurry entering the sedimentation tank through the feeding pipe within a certain range, so as to achieve the optimal sedimentation effect. Therefore, it is necessary to dilute the slurry with water. Mainly, water is sucked by a water pump (the supernatant in the sedimentation tank can be directly absorbed), then the water is fed into the water supply tank through the water supply pipe, and then into the water spraying pipe through the water supply tank, and finally sprayed out through the second water spraying holes and the first water spraying holes in sequence, mixed into the slurry to dilute the slurry. By controlling the flow rate of the water pump, the water flow rate sprayed into the feeding pipe through the water spraying pipe can be well controlled, and the water sprayed into the feeding pipe directly enters the interior of the slurry, achieving the purpose of diluting the slurry, and can also well stir and mix the slurry, making the solids in the slurry more evenly distributed, the flow of the slurry in the feeding pipe smoother, and not easily blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. 6 is a schematic structural view of a perspective of the self-diluting feeding device of the settling tank for alumina production provided by an embodiment of the present invention;

[0017] Figure 2 FIG. 10 is a schematic structural view of a second perspective of the self-diluting feeding device of the settling tank for alumina production provided by an embodiment of the present invention;

[0018] Figure 3 FIG. 14 is a schematic structural view of a perspective of the interior of the feeding pipe provided by an embodiment of the present invention;

[0019] Figure 4 FIG. 18 is a schematic structural view of a second perspective of the interior of the feeding pipe provided by an embodiment of the present invention;

[0020] Figure 5 FIG. 22 is a schematic structural view of the interior of the water supply tank provided by an embodiment of the present invention;

[0021] Figure 6 FIG. 26 is a schematic structural view of the interior of the cover body provided by an embodiment of the present invention.

[0022] Reference numerals: 10 - feeding pipe; 20 - water spraying device; 21 - sleeve; 22 - first water spraying hole; 23 - water spraying pipe; 24 - second water spraying hole; 25 - floating plate; 26 - sliding hole; 27 - sliding rod; 28 - second spring; 30 - water supply device; 31 - water supply tank; 32 - water supply pipe; 40 - driving device; 41 - cover body; 42 - water inlet pipe; 43 - water inlet hole; 44 - rack; 45 - gear; 46 - first spring; 47 - limiting pipe; 48 - limiting rod; 49 - fixing ring; 410 - blocking rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Embodiment

[0024] The following is further described in conjunction with specific embodiments. As shown in the appended Figure 1 - appended Figure 6 As shown, the self-diluting feeding device for an alumina production settling tank in this embodiment includes a feeding pipe 10 connected to the settling tank, a water spraying device 20 disposed inside the feeding pipe 10, and a water supply device 30 disposed below the feeding pipe 10; the water supply device 30 is connected to the water spraying device 20; the water spraying device 20 includes a plurality of sleeves 21 vertically disposed in the feeding pipe 10, first water spraying holes 22 opened on the sleeves 21, a water spraying pipe 23 disposed inside the sleeves 21, and second water spraying holes 24 opened on the side wall of the water spraying pipe 23; the water supply device 30 includes a water supply tank 31 disposed below the feeding pipe 10, a water supply pipe 32 connected to the water supply tank 31, and a water pump connected to the water supply pipe 32; the lower end of the water spraying pipe 23 communicates with the water supply tank 31. Specifically, during use, the slurry is fed into the feeding pipe 10, and the slurry is fed into the sedimentation tank through the feeding pipe 10 for sedimentation. During the feeding process, it is necessary to keep the solid content of the slurry entering the sedimentation tank through the feeding pipe 10 within a certain range, so as to achieve the optimal sedimentation effect. Therefore, it is necessary to dilute the slurry with water. Mainly, the water pump sucks water (it can directly absorb the supernatant in the sedimentation tank), then the water is sent into the water supply tank 31 through the water supply pipe 32, and then sent into the water spraying pipe 23 through the water supply tank 31. Finally, it is sprayed out successively through the second water spraying holes 24 and the first water spraying holes 22 and mixed into the slurry to dilute the slurry. By controlling the flow rate of the water pump, the water flow rate sprayed into the feeding pipe 10 through the water spraying pipe 23 can be well controlled, and the water sprayed into the feeding pipe 10 directly enters the inside of the slurry, achieving the purpose of diluting the slurry, and can also well stir and mix the slurry, making the solids in the slurry more evenly distributed, the flow of the slurry in the feeding pipe 10 smoother, and not easily blocked.

[0025] The water supply device 30 in this embodiment further includes a driving device 40 disposed in the water supply tank 31. The driving device 40 is connected to the lower end of the water spraying pipe 23 and is used to drive the water spraying pipe 23 to rotate. The first water spraying holes 22 and the second water spraying holes 24 correspond to each other one by one. Specifically, by driving the water spraying pipe 23 to rotate through the driving device 40, it is possible to switch between the coincidence and non-coincidence of the first water spraying holes 22 on the sleeve 21 and the second water spraying holes 24 on the water spraying pipe 23. When the first water spraying holes 22 coincide with the second water spraying holes 24, the water in the water spraying pipe 23 can be normally sprayed to dilute the slurry. When it is not necessary to dilute the slurry, the water spraying pipe 23 does not spray water, and by rotating the water spraying pipe 23, the first water spraying holes 22 and the second water spraying holes 24 can be made non-coincident (i.e., misaligned). At this time, the inside of the water spraying pipe 23 is completely isolated from the slurry in the feed pipe 10. Therefore, the slurry in the feed pipe 10 will not enter the water spraying pipe 23, and the solid components in the slurry will not enter the water spraying pipe 23 and the equipment below it, and the situation of blockage of the water spraying pipe 23 and the equipment below it will not occur.

[0026] The driving device 40 in this embodiment includes a cover body 41 covering the inner top wall of the water supply tank 31, a water inlet pipe 42 disposed on the side wall of the cover body 41, a plug rod 410 slidably disposed in the water inlet pipe 42, a rack 44 connected to one end of the plug rod 410 disposed inside the cover body 41, a first spring 46 connected to the rack 44, and a gear 45 disposed at the lower end of the water spraying pipe 23; both the gear 45 and the lower end of the water spraying pipe 23 are disposed in the cover body 41, and the gear 45 meshes with the rack 44. Specifically, the principle of driving the water spraying pipe 23 to rotate in this device is as follows: The water pump pumps water into the water supply tank 31, so that the water in the water supply tank 31 has a certain water pressure. This water pressure can push the plug rod 410 in the water inlet pipe 42, causing the plug rod 410 to move towards the inside of the cover body 41. During the movement of the plug rod 410, the rack 44 can be pushed to move. During the movement of the rack 44, the gear 45 will be driven to rotate, and then the water spraying pipe 23 will be rotated until the first water spraying holes 22 just coincide with the second water spraying holes 24. At this time, water can be sprayed into the feed pipe 10 (the water in the water supply tank 31 enters the cover body 41 through the water inlet pipe 42 and then enters the water spraying pipe 23). When it is not necessary to spray water, the water pump is turned off, and the water pressure in the water supply tank 31 decreases. At this time, the first spring 46 pushes the rack 44 and the plug rod 410, and the plug rod 410 is pushed back into the water inlet pipe 42, blocking the water inlet pipe 42. At this time, the rack 44 will also drive the gear 45 and the water spraying pipe 23 to rotate, causing the first water spraying holes 22 and the second water spraying holes 24 to be misaligned, thus isolating the water spraying pipe 23 from the slurry in the feed tank.

[0027] In this embodiment, a part of the water inlet pipe 42 is disposed inside the cover 41; a water inlet hole 43 is formed in a side wall of one end of the water inlet pipe 42 disposed inside the cover 41. Specifically, this facilitates the water in the water supply tank 31 to enter the cover 41 after passing through the water inlet pipe 42 and the water inlet hole 43.

[0028] In this embodiment, a limiting pipe 47 is disposed on a side of the inside of the cover 41 away from the water inlet pipe 42. A limiting rod 48 is disposed at one end of the rack 44 away from the plug rod 410. The limiting rod 48 is slidably disposed in the limiting pipe 47; the axes of the water inlet pipe 42, the plug rod 410, the limiting rod 48, and the limiting pipe 47 coincide. An annular fixing ring 49 is disposed on the outer wall of the limiting pipe 47. The first spring 46 is sleeved on the outer walls of the limiting rod 48 and the limiting pipe 47 at the same time; one end of the first spring 46 away from the rack 44 is fixedly connected to the fixing ring 49. Specifically, through the cooperation of the limiting pipe 47 and the limiting rod 48, the movement of the rack 44 and the plug rod 410 becomes more linear, avoiding jamming during their movement.

[0029] The spraying device 20 in this embodiment further includes a floating plate 25 disposed above the sleeve 21, and a plurality of sliding holes 26 formed in the lower side of the floating plate 25; one sleeve 21 is slidably disposed in one sliding hole 26; the density of the floating plate 25 is less than the density of water; the floating plate 25 is disposed in the feed pipe 10, and the upper ends of the sleeve 21 and the spray pipe 23 are both sealed ends. Specifically, the flow rate of the slurry changes according to the amount of the upstream product, that is, the height of the slurry in the feed pipe 10 does not remain constant all the time. Therefore, the floating plate 25 will always float on the surface of the slurry in the feed pipe 10. Its function is to make the height of the water sprayed from the spray pipe 23 not exceed the height of the slurry liquid level. The first spray holes 22 exceeding the slurry liquid level part will be blocked by the sliding holes 26 on the lower side of the floating plate 25, so that no water will be sprayed. In this way, the water sprayed from the spray pipe 23 and the sleeve 21 can directly enter the slurry interior.

[0030] In this embodiment, both lower sides of the two ends of the floating plate 25 are arc-shaped. Specifically, the arc-shaped floating plate 25 can reduce the resistance of the floating plate 25 to the movement of the slurry.

[0031] In this embodiment, a vertical sliding rod 27 is disposed on the upper side of the floating plate 25. A second spring 28 is sleeved on the outer wall of the sliding rod 27; the upper end of the sliding rod 27 passes through the feed pipe 10 and is slidably connected to the feed pipe 10. One end of the second spring 28 is fixedly connected to the upper end of the sliding rod 27, and one end is fixedly connected to the outer top wall of the feed pipe 10. Specifically, the second spring 28 can apply a downward pressure to the floating plate 25, so that the floating plate 25 can closely adhere to the slurry surface.

[0032] In summary, for the self-diluting feeding device of the settling tank for alumina production in this embodiment, when in use, the slurry is fed into the feeding pipe 10, and the slurry is fed into the precipitation tank through the feeding pipe 10 for precipitation. During the feeding process, it is necessary to keep the solid content of the slurry entering the precipitation tank through the feeding pipe 10 within a certain range, so as to achieve the optimal precipitation effect. Therefore, it is necessary to dilute the slurry with water. Mainly, water is sucked by a water pump (the supernatant in the precipitation tank can be directly absorbed), and then the water is fed into the water supply tank 31 through the water supply pipe 32, and then fed into the spray pipe 23 through the water supply tank 31. Finally, it is sprayed out after passing through the second spray holes 24 and the first spray holes 22 in sequence, and is mixed into the slurry to dilute the slurry. By controlling the flow rate of the water pump, the water flow rate sprayed into the feeding pipe 10 through the spray pipe 23 can be well controlled, and the water sprayed into the feeding pipe 10 directly enters the interior of the slurry, achieving the purpose of diluting the slurry, and can also well stir and mix the slurry, making the distribution of solids in the slurry more uniform, the flow of the slurry in the feeding pipe 10 smoother, and not easily blocked.

[0033] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A self-diluting feeding device for a thickener in alumina production, characterized in that: It includes a feed pipe (10) connected to a settling tank, a water spraying device (20) disposed inside the feed pipe (10), and a water supply device (30) disposed on the lower side of the feed pipe (10); the water supply device (30) is connected to the water spraying device (20). The water spraying device (20) includes a plurality of sleeves (21) vertically disposed in the feed pipe (10), first water spraying holes (22) opened on the sleeves (21), a water spraying pipe (23) disposed inside the sleeves (21), and second water spraying holes (24) opened on the side wall of the water spraying pipe (23). The water supply device (30) includes a water supply tank (31) disposed below the feed pipe (10), a water supply pipe (32) connected to the water supply tank (31), and a water pump connected to the water supply pipe (32); the lower end of the water spraying pipe (23) communicates with the water supply tank (31).

2. The self-diluting feeding device for a settling tank used in alumina production according to claim 1, wherein: The water supply device (30) further includes a driving device (40) disposed in the water supply tank (31), the driving device (40) is connected to the lower end of the water spraying pipe (23), the driving device (40) is used to drive the water spraying pipe (23) to rotate, and the first water spraying holes (22) correspond to the second water spraying holes (24) one by one.

3. The self-diluting feeding device for a settling tank used in alumina production according to claim 2, wherein: The driving device (40) includes a cover body (41) covering the inner top wall of the water supply tank (31), a water inlet pipe (42) disposed on the side wall of the cover body (41), a blocking rod (410) slidably disposed in the water inlet pipe (42), a rack (44) connected to the end of the blocking rod (410) disposed inside the cover body (41), a first spring (46) connected to the rack (44), and a gear (45) disposed at the lower end of the water spraying pipe (23). The gear (45) and the lower end of the water spraying pipe (23) are both disposed in the cover body (41), and the gear (45) meshes with the rack (44).

4. The self-diluting feeding device for a settling tank used in alumina production according to claim 3, wherein: Part of the water inlet pipe (42) is disposed inside the cover body (41); a water inlet hole (43) is opened on the side wall of the end of the water inlet pipe (42) disposed inside the cover body (41).

5. The self-diluting feeding device for a settling tank used in alumina production according to claim 3, wherein: A limiting pipe (47) is disposed on one side of the inside of the cover body (41) away from the water inlet pipe (42), a limiting rod (48) is disposed at the end of the rack (44) away from the blocking rod (410), and the limiting rod (48) is slidably disposed in the limiting pipe (47). The axes of the water inlet pipe (42), the blocking rod (410), the limiting rod (48), and the limiting pipe (47) coincide.

6. The self-diluting feeding device for a settling tank used in alumina production according to claim 5, characterized in that: An annular fixing ring (49) is disposed on the outer wall of the limiting pipe (47), and the first spring (46) is simultaneously sleeved on the outer walls of the limiting rod (48) and the limiting pipe (47); the end of the first spring (46) away from the rack (44) is fixedly connected to the fixing ring (49).

7. The self-diluting feeding device for a settling tank used in alumina production according to claim 1, characterized in that: The water spraying device (20) further includes a floating plate (25) disposed above the sleeve (21), and a plurality of sliding holes (26) formed in the lower side of the floating plate (25); one of the sleeves (21) is slidably disposed in one of the sliding holes (26); the density of the floating plate (25) is less than the density of water; The floating plate (25) is disposed in the feed pipe (10), and the upper ends of both the sleeve (21) and the water spraying pipe (23) are sealed ends.

8. The self-diluting feeding device for a settling tank used in alumina production according to claim 7, characterized in that: Both lower sides of the two ends of the floating plate (25) are arc-shaped.

9. The self-diluting feeding device for a settling tank used in alumina production according to claim 7, characterized in that: A vertical sliding rod (27) is disposed on the upper side of the floating plate (25), and a second spring (28) is sleeved on the outer wall of the sliding rod (27); The upper end of the sliding rod (27) passes through the feed pipe (10) and is slidably connected to the feed pipe (10), one end of the second spring (28) is fixedly connected to the upper end of the sliding rod (27), and the other end is fixedly connected to the outer top wall of the feed pipe (10).

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