A device for washing dealkalized red mud

Abstract

The present application relates to the technical field of cleaning device, specifically discloses a kind of washing device after dealkalization red mud, including a pair of oppositely arranged storage tanks, be set in water spraying device of storage tank, to connect a pair of storage tanks with connecting pipe, be equipped with negative pressure pipe in the side wall of connecting pipe, with negative pressure machine connected with negative pressure pipe, first driving device, and filter hole being opened in the side wall of connecting pipe;One storage tank is located above the other storage tank, and the first driving device is used to drive a pair of storage tanks to rotate in vertical plane with connecting pipe as center, and a plurality of filter holes are arranged in the negative pressure pipe.The washing device after dealkalization red mud of the present application can sufficiently clean the red mud and fully recover the residual alkali in the red mud under the premise of reducing water consumption.

Description

Technical Field

[0001] This invention relates to the technical field of cleaning devices, and more specifically, to a device for washing red mud after dealkalization. Background Technology

[0002] Red mud is an industrial solid waste discharged during the extraction of alumina in the aluminum industry. Due to its high iron oxide content and appearance resembling reddish soil, it is called red mud. Depending on the ore grade, production methods, and technological level, approximately 1.0 to 1.8 tons of red mud are discharged for every ton of alumina produced. With the increasing accumulation of red mud and its growing environmental pollution, maximizing its resource utilization is now imperative.

[0003] Red mud is a porous solid particle with a high specific surface area. Its surface and pores adsorb or encapsulate a large amount of alkaline liquid phase (such as NaOH, NaAl(OH)4, etc.). Therefore, after a complex dealkali removal process, direct pressure filtration can only remove a portion of the free liquid phase through mechanical pressure, while the alkali adsorbed on the particle surface or in the pores is difficult to completely remove. At this point, the residual alkali (Nt 20-25 g / L) in the red mud solid phase will be discharged with the red mud, leading to alkali resource loss (increased adsorption loss). Therefore, thorough washing of the red mud before pressure filtration can extract the residual alkali, which can then be purified and reused. However, washing out the residual alkali from the red mud also requires a large amount of water, and the water cannot be completely removed during filtration, resulting in some alkali residue. This not only increases costs but also reduces efficiency. Therefore, a more efficient and water-saving red mud washing device should be designed. Summary of the Invention

[0004] The purpose of this invention is to provide a red mud washing device after dealkalization, which can thoroughly clean the red mud and fully recover the residual alkali in the red mud while reducing water consumption.

[0005] The present invention is achieved through the following technical solution: The red mud washing device after dealkalization of the present invention includes a pair of oppositely arranged storage tanks, a water spraying device disposed in the storage tanks, a connecting pipe for connecting the pair of storage tanks, a negative pressure pipe disposed on the side wall of the connecting pipe, a negative pressure machine connected to the negative pressure pipe, a first driving device, and filter holes opened on the side wall of the connecting pipe; one of the storage tanks is disposed above the other storage tank, the first driving device is used to drive the pair of storage tanks to rotate in a vertical plane with the connecting pipe as the center, and a plurality of filter holes are disposed in the negative pressure pipe.

[0006] Furthermore, one side of the connecting tube is covered with a filter cloth; the filter cloth is used to cover the filter holes.

[0007] Furthermore, the water spraying device includes a water spraying pipe horizontally disposed at one end of the storage tank near the connecting pipe, a water spraying hole opened on the side wall of the water spraying pipe, and a water source connected to the end of the water spraying pipe disposed outside the storage tank. A valve is provided at the end of the water spraying pipe disposed outside the storage tank.

[0008] Furthermore, the water spray hole is positioned facing the inner wall of the storage tank.

[0009] Furthermore, the first driving device includes a base, an annular slide rail vertically mounted on the base, an annular slip ring slidably mounted in the slide rail, an internal gear mounted on the inner wall of the slip ring, a first motor fixedly connected to the base, and a drive gear mounted on the output shaft of the first motor; the drive gear meshes with the internal gear; the outer wall of the storage tank is connected to the slip ring via a connecting rod.

[0010] Furthermore, it also includes an ultrasonic generator fixedly connected to the slip ring, and a pair of amplitude transformers connected to the ultrasonic generator; the pair of amplitude transformers pass through the side wall of the connecting pipe and are disposed in the connecting pipe; the pair of amplitude transformers are respectively disposed at both ends of the connecting pipe, and the filter hole is disposed between the pair of amplitude transformers.

[0011] Furthermore, the connecting pipe has a square cross-section; it also includes a backwashing device disposed on the connecting pipe; the backwashing device includes a hollow backwash plate disposed inside the negative pressure pipe, a flushing hole opened on the side of the backwash plate near the connecting pipe, a conduit communicating with the side of the backwash plate near the connecting pipe, a water inlet hole opened on the side wall of the conduit, a sleeve disposed on the outer wall of the connecting pipe away from the negative pressure pipe, a water supply pipe communicating with the side wall of the sleeve, and a second driving device disposed at the end of the sleeve away from the connecting pipe; the backwash plate is used to cover the filter hole, and the end of the conduit away from the backwash plate is a sealed end; the conduit passes through the two side walls of the connecting pipe and is slidably disposed in the sleeve; when the backwash plate is attached to the outer wall of the connecting pipe, the water supply pipe is connected to the water inlet hole; the second driving device is used to drive the conduit to reciprocate in the sleeve.

[0012] Furthermore, the backwashing device also includes a water pump connected to the water supply pipe.

[0013] Furthermore, the second driving device includes a first connecting rod connected to the end of the conduit, a second connecting rod hinged to the first connecting rod, a housing connected to the side wall of the connecting pipe, a second motor disposed within the housing, and a turntable disposed on the output shaft of the second motor; the second connecting rod is hinged to the edge of the turntable.

[0014] Furthermore, the storage tank has a feeding port at the end away from the connecting pipe, and a sealing plate is detachably provided at the feeding port.

[0015] The technical solution of the present invention has at least the following advantages and beneficial effects: In the red mud washing device after dealkali removal of the present invention, the red mud in slurry form after dealkali removal is put into one of the storage tanks (at this time, a pair of storage tanks are at the same height). Then, the first driving device drives the pair of storage tanks to rotate, so that the height of the storage tank containing red mud is raised to the point where the connecting pipe is in an inclined state (the negative pressure pipe is on the lower side). Then, the water spraying device (only the water spraying device in the upper storage tank is turned on) and the negative pressure machine are turned on. The water spraying device promotes the flow of red mud into the connecting pipe by supplying water to the storage tank, and makes the alkali in the red mud fully dispersed in the water. When the red mud slurry flowing into the connecting pipe passes through the filter hole, most of the water in the red mud slurry is directly sucked into the negative pressure pipe and discharged. The remaining red mud flows into the lower storage tank along the connecting pipe. After all the red mud in the upper tank flows into the lower tank, the driving device is used to rotate the tank 90 degrees, so that the tank containing the red mud moves above the empty tank (the negative pressure pipe is still on the lower side). Then the above operation is repeated. After going back and forth like this many times, the residual alkali in the red mud can be completely removed and collected. In addition, this method does not require the use of a stirring device, uses less water, is more efficient, and the final alkaline solution has a higher alkali concentration, resulting in higher alkali extraction efficiency in the subsequent process. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the red mud washing device after alkali removal provided in an embodiment of the present invention;

[0017] Figure 2 This is a two-view structural schematic diagram of the red mud washing device after alkali removal provided in an embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the structure of the storage tank provided in an embodiment of the present invention;

[0019] Figure 4 A schematic diagram of the red mud washing device after alkali removal provided in an embodiment of the present invention during operation;

[0020] Figure 5 This is a schematic diagram of the two states of the red mud washing device after alkali removal provided in an embodiment of the present invention.

[0021] Figure 6 This is a schematic diagram of the internal structure of the connecting pipe provided in an embodiment of the present invention;

[0022] Figure 7 This is a schematic diagram of the backwashing device provided in an embodiment of the present invention.

[0023] Icons: 11-Storage tank, 12-Connecting pipe, 13-Negative pressure pipe, 14-Filter hole, 15-Water spray device, 151-Water spray pipe, 152-Valve, 16-Ultrasonic generator, 17-Amplitude rod, 18-Sealing plate, 20-First drive device, 21-Base, 22-Slide rail, 23-Slip ring, 24-Drive gear, 25-Motor, 30-Backwash device, 31-Backwash plate, 32-Flushing hole, 33-Conduit, 34-Water inlet, 35-Casing, 36-Water supply pipe, 37-Second drive device, 371-First connecting rod. Detailed Implementation

[0024] Example

[0025] The following description, in conjunction with specific embodiments, further illustrates the point, as shown in the appendix. Figure 1 - Appendix Figure 7 As shown, the red mud washing device after dealkalization in this embodiment includes a pair of oppositely arranged storage tanks 11, a water spraying device 15 disposed in the storage tank 11, a connecting pipe 12 for connecting the pair of storage tanks 11, a negative pressure pipe 13 disposed on the side wall of the connecting pipe 12, a negative pressure machine connected to the negative pressure pipe 13, a first driving device 20, and filter holes 14 opened on the side wall of the connecting pipe 12; one storage tank 11 is disposed above the other storage tank 11, and the first driving device 20 is used to drive the pair of storage tanks 11 to rotate in a vertical plane with the connecting pipe 12 as the center, and multiple filter holes 14 are disposed in the negative pressure pipe 13. Specifically, in use, the red mud in slurry form after dealkalization is put into one of the storage tanks 11 (at this time, the pair of storage tanks 11 are at the same height), and then the first driving device 20 is used to drive the pair of storage tanks 11 to rotate, so that the height of the storage tank 11 containing the red mud is raised until the connecting pipe 12 is in an inclined state (as shown in the attached figure). Figure 4 As shown, the negative pressure pipe 13 is located on the lower side. Then, the water spray device 15 (only the water spray device 15 in the upper storage tank 11 is turned on) and the negative pressure machine are turned on. The water spray device 15 promotes the flow of red mud into the connecting pipe 12 by supplying water to the storage tank 11, and makes the alkali in the red mud fully dispersed in the water. When the red mud slurry flowing into the connecting pipe 12 passes through the filter hole 14, most of the water in the red mud slurry is directly sucked into the negative pressure pipe 13 and discharged. The remaining red mud flows into the lower storage tank 11 along the connecting pipe 12. After all the red mud in the upper storage tank 11 has flowed into the lower storage tank 11, the driving device is used to drive the storage tank 11 to rotate 90 degrees, so that the storage tank 11 containing red mud moves to the top of the empty storage tank 11 (as shown in the attached figure). Figure 5 As shown, the negative pressure tube 13 is still on the lower side. Then repeat the above operation. After going back and forth many times, the residual alkali in the red mud can be fully removed and collected. In this way, no stirring device is needed, less water is used, the efficiency is better, the final alkali solution has a higher alkali concentration, and the subsequent alkali extraction efficiency is higher.

[0026] In this embodiment, one side of the connecting pipe 12 is covered with a filter cloth; the filter cloth is used to cover the filter holes 14. Specifically, the filter cloth has a smaller pore size, which can prevent the filter holes 14 from becoming clogged.

[0027] The water spraying device 15 in this embodiment includes a water spraying pipe 151 horizontally positioned at one end of the storage tank 11 near the connecting pipe 12, water spray holes on the side wall of the water spraying pipe 151, and a water source connected to the end of the water spraying pipe 151 located outside the storage tank 11. A valve 152 is provided at the end of the water spraying pipe 151 located outside the storage tank 11. Specifically, the functions of the water spraying pipe 151 are twofold: first, to promote the flow of red mud slurry; and second, to dilute the red mud slurry, allowing the alkali in the red mud to dissolve into the water. It is important to note that the water from the water source does not require a pump to be supplied to the water spraying pipe 151. Since both the storage tank 11 and the connecting pipe 12 are closed structures, when a negative pressure is generated in the connecting pipe 12 and the storage tank 11 through the negative pressure pipe 13, water from the water source can be directly drawn into the water spraying pipe 151 through the negative pressure and sprayed out from the water spray holes. Furthermore, the water intake flow rate of the negative pressure device is almost identical to the water spray flow rate of the water spraying pipe 151.

[0028] In this embodiment, the water spray hole is positioned facing the inner wall of the storage tank 11.

[0029] In this embodiment, the first driving device 20 includes a base 21, an annular slide rail 22 vertically mounted on the base 21, an annular slip ring 23 slidably mounted in the slide rail 22, an internal gear mounted on the inner wall of the slip ring 23, a first motor 25 fixedly connected to the base 21, and a drive gear 24 mounted on the output shaft of the first motor 25; the drive gear 24 meshes with the internal gear; the outer wall of the storage tank 11 is connected to the slip ring 23 via a connecting rod. Specifically, the first motor 25 drives the internal gear to rotate through the drive gear 24, thereby driving the slip ring 23 to rotate in the slide rail 22. The so-called rotation is actually a back-and-forth swing within a certain range, which is more conducive to wiring operations such as pipes and cables. A sprocket and chain drive method can also be used.

[0030] In this embodiment, an ultrasonic generator 16 fixedly connected to the slip ring 23 and a pair of amplitude transformers 17 connected to the ultrasonic generator 16 are also included. The pair of amplitude transformers 17 pass through the side wall of the connecting pipe 12 and are disposed in the connecting pipe 12. The pair of amplitude transformers 17 are respectively disposed at both ends of the connecting pipe 12, and the filter hole 14 is disposed between the pair of amplitude transformers 17. Specifically, the ultrasonic generator 16 transmits ultrasonic vibrations to the red mud slurry inside the connecting pipe 12 through the amplitude transformers 17. When the red mud slurry passes through the amplitude transformers 17, the red mud slurry generates a cavitation effect under the action of ultrasonic waves, which destroys the alkaline film on the surface of the red mud particles. This not only slows down the flow rate of the red mud in the connecting pipe 12, but also plays a stirring role in the red mud slurry, so that the alkali on the surface of the red mud is fully dissolved into the water.

[0031] In this embodiment, the cross-section of the connecting pipe 12 is square; it also includes a backwashing device 30 disposed on the connecting pipe 12; the backwashing device 30 includes a hollow backwash plate 31 disposed inside the negative pressure pipe 13, a flushing hole 32 opened on the side of the backwash plate 31 near the connecting pipe 12, a conduit 33 communicating with the side of the backwash plate 31 near the connecting pipe 12, a water inlet hole 34 opened on the side wall of the conduit 33, a sleeve 35 disposed on the outer wall of the connecting pipe 12 away from the negative pressure pipe 13, and a sleeve 35 on the side of the sleeve 35. The system includes a water supply pipe 36 connected to the wall, and a second drive device 37 located at the end of the sleeve 35 away from the connecting pipe 12; a backflushing plate 31 is used to cover the filter hole 14, and the end of the conduit 33 away from the backflushing plate 31 is a sealed end; the conduit 33 passes through both sides of the connecting pipe 12 and is slidably disposed in the sleeve 35; when the backflushing plate 31 is attached to the outer wall of the connecting pipe 12, the water supply pipe 36 is connected to the water inlet 34; the second drive device 37 is used to drive the conduit 33 to reciprocate within the sleeve 35. Specifically, the water content in the red mud after being absorbed by the negative pressure pipe 13 is significantly reduced, at which point it may adhere to the inner wall of the connecting pipe 12 (mainly accumulating at the filter hole 14), causing the flow rate of the red mud in the connecting pipe 12 to decrease or even become blocked. Therefore, the backflushing device 30 can be used periodically to backflush the red mud at the filter hole 14. The principle is as follows: when the second driving device 37 pushes the conduit 33 and the backflushing plate 31 away from the connecting pipe 12, the water inlet 34 is misaligned with the water supply pipe 36. At this time, the water in the water supply pipe 36 cannot enter the conduit 33 and the backflushing plate 31. Furthermore, due to the gap between the backflushing plate 31 and the connecting pipe 12, the negative pressure device can draw water through the filter hole 14 on the connecting pipe 12 (at this time, the valve 152 on the spray pipe 151 is open). When the second driving device 37 pulls the conduit 33 and the backflushing plate 31 closer to the connecting pipe 12 and the backflushing plate 31 is attached to the connecting pipe 12, the water inlet 34 and the water supply pipe 36 are connected, and the water in the water supply pipe 36 can enter. The water flows into the conduit 33 and then into the backwash plate 31. It then flows out through the flushing hole 32 on the backwash plate 31 and backwashes into the filter hole 14, washing away the red mud adhering to the filter hole 14. During this process, the valve 152 on the spray pipe 151 is closed, so the spray pipe 151 cannot take in water. Therefore, the negative pressure device will directly draw the water from the water supply pipe 36 into the conduit 33 and the backwash plate 31, and flush it out through the flushing hole 32 to achieve the purpose of backwashing. The amount of water entering the conduit 33 through the water supply pipe 36 is related to the negative pressure of the negative pressure device. Therefore, this backwashing process will not cause too much water to enter the connecting pipe 12 and the storage tank 11.

[0032] The backwashing device 30 in this embodiment also includes a water pump connected to the water supply pipe 36. Specifically, when the filter hole 14 is clogged with a large amount of red mud and the backwash plate 31 is attached to the side wall of the connecting pipe 12, the efficiency of negative pressure absorption of water in the water supply pipe 36 may be insufficient, resulting in a poor flushing effect. Therefore, a water pump can be used to assist in supplying water for backwashing.

[0033] The second driving device 37 in this embodiment includes a first connecting rod 371 connected to the end of the conduit 33, a second connecting rod hinged to the first connecting rod 371, a housing connected to the side wall of the connecting pipe 12, a second motor 25 disposed within the housing, and a turntable disposed on the output shaft of the second motor 25; the second connecting rod is hinged to the edge of the turntable. Specifically, the movement of the conduit 33 is essentially a conventional structure that converts circular motion into linear motion, therefore, it will not be described in detail in this embodiment.

[0034] In this embodiment, the storage tank 11 has a feeding port at the end away from the connecting pipe 12, and a sealing plate 18 is detachably installed at the feeding port. Specifically, material can be fed and discharged through the feeding port. When the connecting pipe 12 is vertical, the red mud in the lower storage tank 11 can be discharged more efficiently.

[0035] In summary, in this embodiment, the red mud washing device after dealkalization is used to put the dealkalized red mud, which is in the form of a slurry, into one of the storage tanks 11 (at this time, the two storage tanks 11 are at the same height). Then, the first drive device 20 drives the two storage tanks 11 to rotate, so that the height of the storage tank 11 containing red mud is raised until the connecting pipe 12 is tilted (the negative pressure pipe 13 is on the lower side). Then, the water spray device 15 (only the water spray device 15 in the upper storage tank 11 is turned on) and the negative pressure machine are turned on. The water spray device 15 promotes the flow of red mud into the connecting pipe 12 by supplying water to the storage tank 11, and makes the alkali in the red mud fully dispersed in the water. When the red mud slurry flowing into the connecting pipe 12 passes through the filter hole 14, most of the water in the red mud slurry is directly sucked into the negative pressure pipe 13 and discharged. The remaining red mud flows into the lower storage tank 11 along the connecting pipe 12. After all the red mud in the upper storage tank 11 flows into the lower storage tank 11, the driving device is used to drive the storage tank 11 to rotate 90 degrees, so that the storage tank 11 containing red mud moves to the top of the empty storage tank 11 (the negative pressure pipe 13 is still on the lower side). Then the above operation is repeated. After going back and forth like this many times, the residual alkali in the red mud can be fully removed and collected. In addition, there is no need to use a stirring device, less water is used, the efficiency is better, and the final alkali solution has a higher alkali concentration, resulting in higher alkali extraction efficiency in the subsequent process.

[0036] The above are merely preferred embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A red mud washing device after alkali removal, characterized in that: It includes a pair of oppositely arranged storage tanks (11), a water spray device (15) disposed in the storage tanks (11), a connecting pipe (12) for connecting the pair of storage tanks (11), a negative pressure pipe (13) disposed on the side wall of the connecting pipe (12), a negative pressure machine connected to the negative pressure pipe (13), a first drive device (20), and a filter hole (14) opened on the side wall of the connecting pipe (12); One of the storage tanks (11) is located above the other storage tank (11), and the first driving device (20) is used to drive the pair of storage tanks (11) to rotate in a vertical plane with the connecting pipe (12) as the center. The plurality of filter holes (14) are all located in the negative pressure pipe (13). One side of the connecting tube (12) is covered with a filter cloth; the filter cloth is used to cover the filter hole (14); The first driving device (20) includes a base (21), an annular slide rail (22) vertically mounted on the base (21), an annular slip ring (23) slidably mounted in the slide rail (22), an internal gear mounted on the inner wall of the slip ring (23), a first motor (25) fixedly connected to the base (21), and a drive gear (24) mounted on the output shaft of the first motor (25); the drive gear (24) meshes with the internal gear. The outer wall of the storage tank (11) is connected to the slip ring (23) by a connecting rod; It also includes an ultrasonic generator (16) fixedly connected to the slip ring (23), and a pair of amplitude transformers (17) connected to the ultrasonic generator (16); the pair of amplitude transformers (17) pass through the side wall of the connecting pipe (12) and are disposed in the connecting pipe (12); A pair of amplitude transformers (17) are respectively disposed at both ends of the connecting pipe (12), and the filter hole (14) is disposed between the pair of amplitude transformers (17); The cross-section of the connecting pipe (12) is square; It also includes a backwashing device (30) disposed on the connecting pipe (12); the backwashing device (30) includes a hollow backwash plate (31) disposed in the negative pressure pipe (13), a flushing hole (32) opened on the side of the backwash plate (31) near the connecting pipe (12), a conduit (33) communicating with the side of the backwash plate (31) near the connecting pipe (12), a water inlet hole (34) opened on the side wall of the conduit (33), a sleeve (35) disposed on the outer wall of the connecting pipe (12) away from the negative pressure pipe (13), a water supply pipe (36) communicating with the side wall of the sleeve (35), and a second driving device (37) disposed on the end of the sleeve (35) away from the connecting pipe (12); The backflush plate (31) is used to cover the filter hole (14), and the end of the conduit (33) away from the backflush plate (31) is the sealed end; the conduit (33) passes through the two side walls of the connecting pipe (12) and is slidably disposed in the sleeve (35); when the backflush plate (31) is attached to the outer wall of the connecting pipe (12), the water supply pipe (36) is connected to the water inlet (34); The second drive device (37) is used to drive the catheter (33) to reciprocate within the sheath (35); The backwashing device (30) also includes a water pump connected to the water supply pipe (36).

2. The red mud washing device after dealkalization according to claim 1, characterized in that: The water spraying device (15) includes a water spraying pipe (151) horizontally disposed at one end of the storage tank (11) near the connecting pipe (12), a water spraying hole opened on the side wall of the water spraying pipe (151), and a water source connected to the end of the water spraying pipe (151) located outside the storage tank (11). A valve (152) is provided at the end of the water spraying pipe (151) located outside the storage tank (11).

3. The red mud washing device after dealkalization according to claim 2, characterized in that: The water spray hole is positioned facing the inner wall of the storage tank (11).

4. The red mud washing device after dealkalization according to claim 1, characterized in that: The second drive device (37) includes a first connecting rod (371) connected to the end of the conduit (33), a second connecting rod hinged to the first connecting rod (371), a housing connected to the side wall of the connecting pipe (12), a second motor disposed in the housing, and a turntable disposed on the output shaft of the second motor; the second connecting rod is hinged to the edge of the turntable.

5. The red mud washing device after dealkalization according to claim 1, characterized in that: The storage tank (11) has a feeding port at one end away from the connecting pipe (12), and a sealing plate (18) is detachably provided at the feeding port.

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