Aluminum oxide production wastewater filtering equipment

Abstract

The invention discloses alumina production wastewater filtering equipment which comprises a cyclone separator barrel, a cyclone separation assembly is arranged in the cyclone separator barrel, the cyclone separator barrel is composed of an upper cylindrical section and a cone section, and the cyclone separation assembly comprises an upper spiral plate and a lower spiral plate. The upper spiral plate and the lower spiral plate are fixedly connected to the inner side of the cyclone separator barrel, a lap joint barrel is arranged at the top of the cyclone separator barrel, a water outlet inner barrel is rotationally connected to the lap joint barrel in a lap joint mode, and the bottom of the water outlet inner barrel extends to the boundary between the upper cylindrical section and the cone section; a gap knocking assembly is arranged on the outer side of the cone section of the cyclone separator cylinder; through the design of multi-stage spiral flow guide, flow field optimization, gap knocking, anti-blocking stirring, automatic slag discharging and the like, the separation efficiency is remarkably improved, the slag discharging opening is effectively prevented from being blocked, the service life of equipment is prolonged, the automation degree and operation convenience of the equipment are improved, the production cost is reduced, and the production continuity is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal separation, and particularly to a filtering device for alumina production wastewater. Background Art

[0002] The alumina production wastewater has the characteristics of complex composition, high suspended solid concentration, containing red mud particles, lye and colloidal substances, and strong corrosiveness. Traditional filtering devices often adopt gravity sedimentation, centrifugal separation or inertial separation technologies. Among them, the centrifugal separation technology is often realized through a cyclone separator due to its relatively high treatment efficiency. The centrifugal force generated by high-speed rotation can effectively separate the red mud particles in the wastewater. However, the traditional cyclone separator exposes significant defects in practical applications:

[0003] The existing cyclone separator lacks an efficient cyclone separation component, resulting in difficult full separation of solid particles and low separation efficiency, so that the content of suspended substances in the wastewater is still relatively high. The bottom of the cyclone separator is an inverted conical structure, that is, the diameter of the slag discharge port is too small. After the high-concentration red mud particles are mixed with colloidal substances, they are easy to adhere and agglomerate, causing blockage of the slag discharge port, and it is necessary to stop the machine every day for high-pressure water flushing, which affects continuous production. Summary of the Invention

[0004] The purpose of the present invention is to provide a filtering device for alumina production wastewater to solve the problems proposed in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A filtering device for alumina production wastewater includes a cyclone separator cylinder body. A cyclone separation component is arranged inside the cyclone separator cylinder body. The cyclone separator cylinder body is composed of an upper cylindrical section and a conical section. The cyclone separation component includes an upper spiral plate and a lower spiral plate. The upper spiral plate and the lower spiral plate are fixedly connected to the inner side of the cyclone separator cylinder body. A lapping cylinder body is arranged at the top of the cyclone separator cylinder body. An inner water outlet cylinder is rotationally lapped on the lapping cylinder body. The bottom of the inner water outlet cylinder extends to the boundary line between the upper cylindrical section and the conical section. A spiral plate is arranged on the outer side of the inner water outlet cylinder;

[0006] A gap knocking component is arranged on the outer side of the conical section of the cyclone separator cylinder body. The gap knocking component includes a support seat. A rotating shaft is rotationally connected to the support seat through a support block. A knocking block is fixedly sleeved on the rotating shaft. The knocking part of the knocking block is close to the outer side of the bottom of the conical section. The cyclone separation component rotates and centrifuges the wastewater, and realizes the gap knocking of the knocking block on the outer side of the bottom of the conical section through the transmission of an adjusting component;

[0007] An anti-blocking stirring component is arranged at the bottom of the cyclone separator cylinder body. The anti-blocking stirring component includes a transition cover. A transmission shaft is rotationally connected to the transition cover. Stirring plates are arranged on the transmission shaft. The transition cover is in an arc cavity structure. The end of the stirring plate extends to the part above the parallel line at the bottom end of the conical section.

[0008] Preferably, a tangential inlet is provided on the side of the cyclone separator cylinder body, the tangential inlet faces the inner water outlet cylinder, a first annular groove is formed at the top edge of the inner water outlet cylinder, and an arc block is arranged outside the top of the inner water outlet cylinder.

[0009] Preferably, the adjusting assembly includes a receiving seat fixedly installed on the top of the cyclone separator cylinder body, and a top block is slidably inserted into the receiving seat.

[0010] Preferably, the end of the top block has an inclined surface structure, and the end penetrates through the corresponding position between the overlapping cylinder body and the arc block, and the movement track of the arc block forms an annular groove, and the annular groove is opened on the inner side of the overlapping cylinder body.

[0011] Preferably, a first airbag is arranged between the top block and the receiving seat, a connecting pipe is arranged at the end of the first airbag, a gear is arranged on the rotating shaft, a fixed seat is arranged at the bottom of the rotating shaft, a groove is formed in the fixed seat, a mounting block is arranged at the opening of the groove, and a rack block is slidably inserted into the groove.

[0012] Preferably, the rack block is meshed with the gear, a return spring is arranged between the rack block and the groove, a second airbag is arranged between the mounting block and the groove, and the second airbag is communicated with the connecting pipe.

[0013] Preferably, a waste residue outlet pipe is arranged at the bottom of the transition cover, a collecting cylinder is screwed on the waste residue outlet pipe, and a limiting ring is arranged outside the waste residue outlet pipe.

[0014] Preferably, a pressure sensor is arranged on the limiting ring, the pressure sensor is electrically connected with the control center, a switching valve is arranged inside the waste residue outlet pipe, and the switching valve is electrically connected with the control center.

[0015] Preferably, an external thread is arranged on the waste residue outlet pipe, an internal thread is arranged on the inner side of the end of the collecting cylinder, and the external thread is in threaded connection with the internal thread.

[0016] Preferably, the end of the arc block has a semi-circular arc structure, the overlapping cylinder body has a stepped cylindrical structure, and a second annular groove is formed at the top, and sealing rings are embedded in both the first annular groove and the second annular groove.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. By using the upper spiral plate and the lower spiral plate in combination, as well as the spiral plate on the outer side of the inner water outlet cylinder, a multi-stage spiral diversion system is formed. The upper spiral plate forms an initial swirl, the lower spiral plate extends the swirl path, enhances the probability of particle collision and sedimentation, and the spiral plate on the outer side of the inner water outlet cylinder further stabilizes the flow field around the inner cylinder, preventing the separated solid particles from being rolled up again, improving the water quality of the effluent. This multi-stage spiral diversion design is more efficient than the traditional single swirl design and can more effectively direct the solid particles in the wastewater to the wall of the cylinder and move downward under the action of centrifugal force to achieve solid-liquid separation.

[0019] 2. By arranging a gap knocking assembly on the outer side of the cone section of the cyclone separator cylinder body, including a support seat, a rotating shaft and a knocking block, through the transmission of the adjusting assembly, the rotation of the cyclone separation assembly can drive the knocking block to knock the outer side of the bottom of the cone section at intervals, thereby destroying the particle adhesion layer on the inner side of the bottom of the cone section, preventing material accumulation and blockage. This active anti-blocking design avoids the passive methods such as relying on manual or high-pressure water flushing in the traditional design and improves the reliability and continuous operation ability of the equipment.

[0020] 3. A pressure sensor and a switching valve are installed on the waste residue outlet pipe and are electrically connected to the control center. The pressure sensor detects the pressure of the collection cylinder installation and transmits the signal to the control center. When the collection cylinder is installed in place, the pressure sensor detects the pressure, and the control center controls the switching valve to open for slag discharge; when the collection cylinder needs to be replaced, the pressure sensor does not detect the pressure, and the control center controls the switching valve to close the waste residue outlet pipe without stopping the machine. This automatic slag discharge design improves the automation degree of the equipment, reduces the labor cost, and ensures the continuity of production. Brief Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the alumina production wastewater filtration equipment of the present invention.

[0022] Figure 2 It is a schematic structural diagram of the waste residue outlet pipe of the present invention.

[0023] Figure 3 It is a schematic structural diagram of the collection cylinder of the present invention.

[0024] Figure 4 It is a schematic structural diagram of the receiving seat and the support seat of the present invention.

[0025] Figure 5 It is a schematic structural diagram of the cyclone separation assembly of the present invention.

[0026] Figure 6 It is a cross-sectional view of the transition cover of the present invention.

[0027] Figure 7 It is a cross-sectional view of the receiving seat of the present invention.

[0028] Figure 8 For the present invention Figure 7 is a schematic enlarged view of the structure at location A in the present invention.

[0029] Figure 9 is a cross-sectional view of the fixed seat of the present invention.

[0030] Figure 10 For the present invention Figure 9 is a schematic enlarged view of the structure at location B in the present invention.

[0031] In the figure: cyclone separator cylinder body 1; upper spiral plate 11; lower spiral plate 12; tangential inlet 2; inner water outlet cylinder 3; first annular groove 31; arc block 32; spiral plate 33; overlapping cylinder body 4; second annular groove 41; transition cover 5; transmission shaft 51; stirring plate 52; waste residue outlet pipe 6; external thread 61; switching valve 62; limit ring 63; pressure sensor 64; collection cylinder 7; internal thread 71; accommodation seat 8; top block 81; first airbag 82; connecting pipe 83; support seat 9; rotating shaft 91; gear 92; knocking block 93; fixed seat 94; return spring 95; second airbag 96; mounting block 97; rack block 98. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] Please refer to Figure 1 is a schematic structural view of the alumina production wastewater filtration equipment of the present invention. Figure 5 is a schematic structural view of the cyclone separation component of the present invention. The present invention provides a technical solution: an alumina production wastewater filtration equipment, including a cyclone separator cylinder body 1, a cyclone separation component is arranged inside the cyclone separator cylinder body 1. The cyclone separator cylinder body 1 is composed of an upper cylindrical section and a conical section, providing space for the entire separation process. The upper cylindrical section accommodates the high-speed rotating wastewater, and initially separates solid particles by centrifugal force. The conical section accelerates the downward movement of the fluid through a tapered structure, enhancing the sedimentation efficiency of solid particles. The cyclone separator cylinder body 1 is lined with a ceramic coating made of wear-resistant alloy steel to resist the erosion of high-speed particles.

[0034] The cyclone separation component includes an upper spiral plate 11 and a lower spiral plate 12. The upper spiral plate 11 and the lower spiral plate 12 are fixedly connected to the inner side of the cyclone separator cylinder 1. The upper spiral plate 11 is fixed to the inner side of the cylinder to guide the waste water to form an initial swirl. The lower spiral plate 12 is connected to the upper spiral plate 11 to extend the swirl path and increase the probability of particle collision and sedimentation. The upper spiral plate 11 and the lower spiral plate 12 can guide the waste water, enhance the swirl effect, and improve the separation efficiency. The design of the spiral plate can more effectively direct the solid particles in the waste water to the cylinder wall and move downward under the action of centrifugal force to achieve solid-liquid separation.

[0035] The combined use of the upper spiral plate 11 and the lower spiral plate 12, together with the spiral plate 33 on the outer side of the inner water outlet cylinder 3, constitutes a multi-stage spiral diversion system. The upper spiral plate forms an initial swirl, the lower spiral plate extends the swirl path and increases the probability of particle collision and sedimentation. The spiral plate 33 on the outer side of the inner water outlet cylinder 3 further stabilizes the flow field around the inner cylinder, prevents the separated solid particles from being rolled up again, and improves the water quality of the outlet. This multi-stage spiral diversion design is more efficient than the traditional single swirl design and can more effectively direct the solid particles in the waste water to the cylinder wall and move downward under the action of centrifugal force to achieve solid-liquid separation.

[0036] A lapped cylinder 4 is fixedly connected to the top of the cyclone separator cylinder 1. An inner water outlet cylinder 3 is rotatably lapped on the lapped cylinder 4. The bottom of the inner water outlet cylinder 3 extends to the boundary line between the upper cylindrical section and the conical section. The inner water outlet cylinder 3 collects the upward moving clear water and guides it to the top for discharge. The design of extending to the boundary line at the bottom can more effectively collect the separated clear water and reduce the influence of short-circuit flow. A spiral plate 33 is fixedly connected to the outer side of the inner water outlet cylinder 3. The spiral plate 33 further stabilizes the flow field around the inner cylinder, prevents the separated solid particles from being rolled up again, and improves the water quality of the outlet. At the same time, the waste water can drive the rotation of the inner water outlet cylinder 3 to further enhance the swirl effect.

[0037] Figure 4 This is a structural schematic diagram of the accommodation seat and the support seat of the present invention. A clearance knocking component is arranged on the outer side of the conical section of the cyclone separator cylinder 1. The clearance knocking component prevents material accumulation on the inner side of the bottom of the conical section and avoids blockage. The clearance knocking component includes a support seat 9. A rotating shaft 91 is rotatably connected to the support seat 9 through a support block. A knocking block 93 is fixedly sleeved on the rotating shaft 91. The knocking part of the knocking block 93 is close to the outer side of the bottom of the conical section. The rotation of the cyclone separation component is transmitted through the adjusting component to achieve the clearance knocking of the knocking block 93 on the outer side of the bottom of the conical section;

[0038] Figure 6This is a cross-sectional view of the transition cover of the present invention. At the bottom of the cyclone separator cylinder 1, an anti-clogging stirring assembly is provided. The anti-clogging stirring assembly includes a transition cover 5. A transmission shaft 51 is rotatably connected to the transition cover 5. An electric motor is installed at the end of the transmission shaft 51. The start of the electric motor drives the transmission shaft 51 to rotate. A stirring plate 52 is fixedly connected to the transmission shaft 51. The transition cover 5 has an arc-shaped cavity structure. The end of the stirring plate 52 extends to a part above the parallel line at the bottom end of the cone section. The stirring plate 52 stirs the wastewater at the bottom of the cone section to prevent solid particles from depositing and clogging.

[0039] A tangential inlet 2 is connected to the side of the cyclone separator cylinder 1. The tangential inlet 2 faces the inner water outlet cylinder 3 directly. The tangential inlet 2 is connected to a wastewater inlet pipe. The wastewater in the wastewater inlet pipe is transported into the cyclone separator cylinder 1 through the tangential inlet 2 by a delivery pump, so that the wastewater enters the cylinder 1 at a tangential velocity. A first annular groove 31 is provided at the top edge of the inner water outlet cylinder 3. An arc-shaped block 32 is fixedly connected to the outer side of the top of the inner water outlet cylinder 3.

[0040] The end of the arc-shaped block 32 has a semi-circular arc structure. The overlapping cylinder 4 has a stepped cylindrical structure and a second annular groove 41 is provided at the top. Sealing rings are embedded in both the first annular groove 31 and the second annular groove 41. The sealing rings ensure the sealing between the inner water outlet cylinder 3 and the overlapping cylinder 4 to prevent wastewater leakage. The overlapping cylinder 4 is fixedly connected to the subsequent treatment pipeline (not shown in the drawing), so that the clear water goes out from the inner water outlet cylinder 3 and enters the subsequent pipeline for subsequent processes.

[0041] Figure 7 This is a cross-sectional view of the receiving seat of the present invention. Figure 8 This is the present invention Figure 7 This is an enlarged structural schematic diagram of part A in the present invention. The adjusting assembly includes a receiving seat 8. The receiving seat 8 is fixedly installed on the top of the cyclone separator cylinder 1. A top block 81 is slidably inserted into the receiving seat 8. The end of the top block 81 has an inclined surface structure and corresponds to the part between the overlapping cylinder 4 and the arc-shaped block 32. The movement trajectory of the arc-shaped block 32 forms an annular groove, and the annular groove is opened on the inner side of the overlapping cylinder 4. A first airbag 82 is bonded between the top block 81 and the receiving seat 8. A connecting pipe 83 is communicated with the end of the first airbag 82.

[0042] The rotation of the inner water outlet cylinder 3 drives the arc-shaped block 32 to periodically compress the top block 81. The rotation of the arc-shaped block 32 abuts against the inclined surface of the top block 81, causing the top block 81 to move into the receiving seat 8 and squeeze the first airbag 82. The gas in the first airbag 82 is transmitted through the connecting pipe 83.

[0043] Figure 9 This is a cross-sectional view of the fixed seat of the present invention. Figure 10 This is the present invention Figure 9Schematic diagram of the enlarged structure at B in the [device name]. A gear 92 is fixedly sleeved on a rotating shaft 91. The bottom of the rotating shaft 91 is fixedly connected to a fixed seat 94. The fixed seat 94 is provided with a groove. An installation block 97 is fixed at the opening of the groove by screws. A rack block 98 is slidably inserted into the groove. The rack block 98 meshes with the gear 92. A return spring 95 is fixedly connected between the rack block 98 and the groove. A second airbag 96 is adhesively bonded between the installation block 97 and the groove. The second airbag 96 is communicated with a connecting pipe 83. The model specifications of the second airbag 96 and the first airbag 82 can be selected according to specific working conditions.

[0044] When the gas in the first airbag 82 is transmitted to the second airbag 96 through the connecting pipe 83, the second airbag 96 expands and squeezes the movement of the rack block 98, thereby driving the gear 92 and the rotating shaft 91 to rotate, and driving the knocking block 93 to knock the bottom of the conical section, so as to break the particle adhesion layer on the inner side of the bottom of the conical section.

[0045] Through the transmission of the adjustment component, the rotation of the cyclone separation component can drive the knocking block 93 to intermittently knock the outer side of the bottom of the conical section, so as to break the particle adhesion layer on the inner side of the bottom of the conical section, prevent material accumulation and blockage. This active anti-blocking design avoids the passive methods relying on manual or high-pressure water flushing in the traditional design, and improves the reliability and continuous operation ability of the equipment.

[0046] Figure 2 Schematic diagram of the structure of the waste residue outlet pipe of the present invention Figure 6 Cross-sectional view of the transition cover of the present invention Figure 3 Schematic diagram of the structure of the collection cylinder of the present invention. The bottom of the transition cover 5 is welded with a waste residue outlet pipe 6. The transition cover 5 forms a transition space to provide space for the rotation of the stirring plate 52 and guide the waste residue to the waste residue outlet pipe 6. A collection cylinder 7 is screwed on the waste residue outlet pipe 6. A limit ring 63 is fixedly connected to the outside of the waste residue outlet pipe 6. The drive shaft 51 drives the stirring plate 52 to continuously stir the bottom slurry through a motor to prevent caking. The waste residue is introduced into the waste residue outlet pipe 6 through the transition cover 5.

[0047] A pressure sensor 64 is installed on the limit ring 63. The pressure sensor 64 is electrically connected to the control center. A switching valve 62 is installed inside the waste residue outlet pipe 6. The switching valve 62 is electrically connected to the control center. An external thread 61 is welded on the waste residue outlet pipe 6. An internal thread 71 is welded on the inner side of the end of the collection cylinder 7. The external thread 61 is threadedly connected to the internal thread 71. The pressure sensor 64 detects the pressure of the installation and abutment of the collection cylinder 7 and transmits the signal to the control center for controlling the opening and closing of the switching valve 62. When the collection cylinder 7 is replaced, the pressure sensor 64 does not detect pressure, and the control center controls the switching valve 62 to close the waste residue outlet pipe 6 without stopping the machine. This automatic slag discharge design improves the automation degree of the equipment, reduces the labor cost, and ensures the continuity of production.

[0048] During actual use, the wastewater enters the cyclone separator cylinder 1 at high speed through the tangential inlet 2. The tangential velocity induces a centrifugal swirl. The solid particles are thrown towards the cylinder wall under the action of centrifugal force and settle along the conical section. The clear water gathers towards the center and is discharged through the inner outlet cylinder 3. The upper spiral plate 11 and the lower spiral plate 12 extend the fluid path and increase the probability of particle collision. The spiral plate 33 of the inner outlet cylinder 3 inhibits secondary entrainment. When the inner outlet cylinder 3 rotates, the rotation of the inner outlet cylinder 3 drives the arc block 32 to periodically compress the top block 81. The rotation of the arc block 32 abuts against the inclined surface of the top block 81, causing the top block 81 to move into the receiving seat 8 and squeeze the first airbag 82. The gas in the first airbag 82 is transmitted through the connecting pipe 83 to the second airbag 96. The second airbag 96 expands and squeezes the movement of the rack block 98, thereby driving the gear 92 and the rotating shaft 91 to rotate, and driving the knocking block 93 to knock the bottom of the conical section, so as to break the particle adhesion layer on the inner side of the bottom of the conical section. The transmission shaft 51 drives the stirring plate 52 through the motor to continuously disturb the bottom slurry to prevent caking. The waste residue passes through the transition cover 5 and is introduced into the waste residue outlet pipe 6, which can effectively prevent the deposition and caking of solid particles at the bottom of the conical section, ensure the smoothness of the slag discharge port. After the collection cylinder 7 is fixed by threaded connection, the pressure sensor 64 detects the in-place signal and sends it to the control center. The control center controls the opening of the switching valve 62 to discharge the slag. When the collection cylinder 7 is replaced, the pressure sensor 64 does not detect the pressure, and the control center controls the switching valve 62 to close the waste residue outlet pipe 6. Through designs such as multi-stage spiral diversion, optimized flow field, intermittent knocking, anti-blocking stirring, and automatic slag discharge, the separation efficiency is significantly improved, the slag discharge port is effectively prevented from being blocked, the service life of the equipment is extended, the automation degree and operation convenience of the equipment are improved, the production cost is reduced, and the continuity of production is ensured.

[0049] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Alumina production wastewater filtration equipment, including a cyclone separator cylinder, characterized in that: A cyclone separation assembly is arranged in the cyclone separator cylinder, the cyclone separator cylinder is composed of an upper cylindrical section and a conical section, the cyclone separation assembly includes an upper spiral plate and a lower spiral plate, the upper spiral plate and the lower spiral plate are fixedly connected to the inner side of the cyclone separator cylinder, a lap cylinder is arranged on the top of the cyclone separator cylinder, a water outlet inner cylinder is rotatably overlapped on the lap cylinder, the bottom of the water outlet inner cylinder extends to the dividing line between the upper cylindrical section and the conical section, and a spiral plate is arranged on the outer side of the water outlet inner cylinder; A gap knocking assembly is arranged on the outside of the cone section of the cyclone separator cylinder, and the gap knocking assembly includes a support seat, a rotating shaft is rotatably connected to the support seat through a support block, a knocking block is fixedly sleeved on the rotating shaft, and the knocking part of the knocking block is close to the outside of the bottom of the cone section. The rotation of the cyclone separation assembly centrifuges the wastewater, and the knocking block gap knocks the outside of the bottom of the cone section through the transmission of the adjustment assembly; An anti-clogging stirring assembly is arranged at the bottom of the cyclone separator cylinder, and the anti-clogging stirring assembly includes a transition cover, a transmission shaft is rotatably connected to the transition cover, a stirring plate is arranged on the transmission shaft, the transition cover is an arc cavity structure, and the end of the stirring plate extends to the part above the parallel line of the bottom end of the cone section.

2. The alumina production wastewater filtration equipment according to claim 1, characterized in that: A tangential inlet is arranged on the side of the cyclone separator cylinder, and the tangential inlet faces the water outlet inner cylinder. A first annular groove is arranged at the top edge of the water outlet inner cylinder, and an arc block is arranged on the outer side of the top of the water outlet inner cylinder.

3. The alumina production wastewater filtration equipment according to claim 1, characterized in that: The adjustment assembly comprises a receiving seat, which is fixedly mounted on the top of the cyclone separator cylinder, and a top block is slidably inserted on the receiving seat.

4. The alumina production wastewater filtration equipment according to claim 3, characterized in that: The end of the top block is in an inclined surface structure, and the end passes through the overlapped cylinder and corresponds to the arc block. The movement trajectory of the arc block forms an annular groove, and the annular groove is opened on the inner side of the overlapped cylinder.

5. The alumina production wastewater filtration equipment according to claim 3, characterized in that: A first airbag is arranged between the top block and the accommodating seat, a connecting tube is arranged at the end of the first airbag, a gear is arranged on the rotating shaft, a fixing seat is arranged at the bottom of the rotating shaft, a groove is opened on the fixing seat, a mounting block is arranged at the opening of the groove, and a rack block is slidably inserted on the groove.

6. The alumina production wastewater filtration equipment according to claim 5, characterized in that: The rack block is meshed with the gear, a return spring is arranged between the rack block and the groove, a second air bag is arranged between the mounting block and the groove, and the second air bag is communicated with the connecting pipe.

7. The alumina production wastewater filtration equipment according to claim 1, characterized in that: A waste residue outlet pipe is arranged at the bottom of the transition cover, a collecting cylinder is screwed on the waste residue outlet pipe, and a limiting ring is arranged on the outer side of the waste residue outlet pipe.

8. The alumina production wastewater filtration equipment according to claim 7, characterized in that: The limit ring is provided with a pressure sensor, which is electrically connected to the control center; the waste residue outlet pipe is provided with a switch valve, which is electrically connected to the control center.

9. The alumina production wastewater filtration equipment according to claim 7, characterized in that: The waste residue outlet pipe is provided with an external thread, the inner side of the end of the collecting cylinder is provided with an internal thread, and the external thread and the internal thread are threadedly connected.

10. The alumina production wastewater filtration equipment according to claim 2, characterized in that: The end of the arc block is in a semi-arc structure, the overlapping cylinder is in a stepped cylindrical structure, and a second annular groove is opened on the top, and sealing rings are embedded in the first annular groove and the second annular groove.

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