Defluorination and dust removal integrated equipment for electrolytic aluminum flue gas treatment

Abstract

The invention relates to the technical field of electrolytic aluminum flue gas treatment, in particular to defluorination and dust removal integrated equipment for electrolytic aluminum flue gas treatment, which comprises a defluorination tank, a gas inlet is formed in the upper end of the defluorination tank, a gas outlet is formed in the lower end of the defluorination tank, and the gas outlet is connected to a bag-type dust remover through a conveying pipeline; a particle feeding structure used for feeding aluminum oxide particles into the defluorination tank is arranged on the side face of the defluorination tank, an inclined intercepting screen plate is arranged at the lower bottom of the defluorination tank, the portion, located at the lowest position of the intercepting screen plate, of the defluorination tank is communicated with a downwards-inclined particle discharging pipe, and the other end of the particle discharging pipe is connected with a particle collecting box. According to the defluorination and dust removal integrated equipment for electrolytic aluminum flue gas treatment, flowing of aluminum oxide particles in the defluorination tank can be achieved, it can be guaranteed that the aluminum oxide particles with good adsorption performance exist in the defluorination tank all the time, and then the good defluorination effect can be guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of waste gas treatment of aluminum electrolysis, and in particular to an integrated defluorination and dust removal device for treating aluminum electrolysis fume. Background Art

[0002] During the aluminum electrolysis production process, a large amount of harmful substances such as fluoride, sulfur dioxide and other dust particles will overflow from the electrolytic cell. If these wastes are not effectively treated, serious environmental and ecological problems will occur.

[0003] At present, the purification of fluorine-containing flue gas from electrolytic aluminum mainly uses alumina as an adsorbent, that is, the flue gas is passed into a tank filled with alumina particles, and then the flue gas treated by the alumina particle tank is passed into a bag filter for dust removal.

[0004] The existing structure has certain problems when treating flue gas. Alumina particles are used to remove harmful gases such as fluorine because of their good adsorption properties. However, long-term static use will cause the adsorption function of the alumina particles in the tank to decrease, which will cause harmful gases to enter the bag-type dust collector. The bag-type dust collector cannot handle the harmful gases, which will lead to harmful gas emissions. Summary of the invention

[0005] The purpose of the present invention is to provide an integrated defluorination and dust removal device for electrolytic aluminum fume treatment, which can realize the flow of alumina particles in the defluorination tank, thereby ensuring that the defluorination tank always has alumina particles with good adsorption performance, thereby ensuring a good defluorination effect.

[0006] In order to achieve the above purpose, the technical solution adopted by the present invention is: An integrated defluorination and dust removal device for treating aluminum electrolysis flue gas comprises a defluorination tank, wherein an air inlet is arranged at the upper end of the defluorination tank, and an air outlet is arranged at the lower end, and the air outlet is connected to a bag dust collector through a conveying pipe; a particle feeding structure for feeding alumina particles into the defluorination tank is arranged on the side of the defluorination tank, an inclined intercepting mesh plate is arranged at the lower bottom of the defluorination tank, and a downwardly inclined particle discharge pipe is connected to the lowest part of the defluorination tank at the intercepting mesh plate, and the other end of the particle discharge pipe is connected to a particle collecting box.

[0007] Preferably, the lower part of the particle collection box is connected to a residual gas delivery pipe through a delivery connector, the residual gas delivery pipe and the gas outlet are connected to the same three-way joint, and the other interface of the three-way joint is connected to the bag dust collector through a pipeline.

[0008] Preferably, the particle feeding structure includes a particle feeding pipe installed on the side of the defluorination tank and connected to the tank body, and a particle placing mesh plate located in the defluorination tank and below the particle feeding pipe 2 for receiving the alumina particles delivered by the particle feeding pipe. The other end of the particle feeding pipe is open and is equipped with a sealing cover, the upper part of the outer end of the particle feeding pipe is equipped with a particle input port, and the particle feeding pipe is equipped with a pushing structure for pushing the alumina particles therein into the particle placing mesh plate.

[0009] Preferably, the pushing structure comprises a particle pushing rod penetrating the sealing cover, and one end of the particle pushing rod located in the particle feeding pipe is connected to a particle pushing block.

[0010] Preferably, the pushing structure comprises a particle pushing motor installed on the outside of the sealing cover and a particle pushing shaft driven by the particle pushing motor and located in the particle feeding pipe, and a spiral reamer is connected to the particle pushing shaft.

[0011] Preferably, there is a distance between the port of the particle feeding pipe communicating with the defluorination tank and the end of the particle pushing shaft.

[0012] Preferably, annular water pipes are evenly arranged in the defluorination tank from top to bottom, and each annular water pipe is equipped with a water cooling inlet pipe and a water cooling outlet pipe passing through the defluorination tank, and all water cooling outlet pipes are connected to the water cooling manifold arranged on the outer wall of the defluorination tank.

[0013] Preferably, the particle feeding structures are located on both sides of the defluorination tank, and the upper part and the lower part of each annular water pipe are equipped with a particle feeding structure.

[0014] Preferably, the particle collection box is provided with a particle collection feed port cooperating with the particle discharge pipe, and an odd number of particle collection mesh plates are arranged in the particle collection box, all of the particle collection mesh plates are inclined plates, and the inclination directions of adjacent particle collection mesh plates are opposite.

[0015] Preferably, the lowest particle collecting mesh plate is connected to the inner wall away from the closing door, and there is a gap between it and all particle collecting mesh plates and the opening and closing door and the inner wall away from the closing door.

[0016] The technical effects of the present invention are: 1. The present invention can realize the flow of alumina particles in the defluorination tank, thereby ensuring that the defluorination tank always has alumina particles with good adsorption performance, thereby ensuring a good defluorination effect.

[0017] 2. The present invention can collect a small amount of smoke and dust carried in the particle collection box through the design of the residual gas delivery pipe.

[0018] 3. The particle feeding structure designed in the present invention can realize controllable particle pushing, can control the pushing of particles according to the specific electrolytic aluminum fume conditions, and can be equipped with manual and automatic pushing modes, and can be installed according to specific conditions; and it can ensure that there are alumina particles at one end of the particle feeding pipe connected to the defluorination tank to prevent harmful gases from escaping from the particle input port through the particle feeding pipe.

[0019] 5. The annular water channel designed in the present invention can cool down the high-temperature electrolytic aluminum flue gas, reduce the activity of the gas, and at the same time utilize the heat of the flue gas.

[0020] 6. The present invention can achieve good particle collection through the structural design of the particle collection box, and can ensure that the residual smoke entering the particle collection box can be separated from the aluminum oxide particles through multiple particle collection mesh plates, and then enter the subsequent bag dust collector.

[0021] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings used in the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 This is a schematic diagram of an integrated defluorination and dust removal equipment for electrolytic aluminum flue gas treatment after hiding the bag dust collector.

[0024] Figure 2 It is a three-dimensional schematic diagram of the defluorination tank.

[0025] Figure 3 It is a side view of the defluorination tank.

[0026] Figure 4 This is a three-dimensional schematic diagram of the waterway section.

[0027] Figure 5 Schematic diagram of the particle feeding structure of Example 1.

[0028] Figure 6 This is a cross-sectional view of the particle feeding structure of Example 1.

[0029] Figure 7 This is a cross-sectional view of the particle feeding structure of Example 2.

[0030] Figure 8 This is a partial cross-sectional view of the particle feeding structure of Example 3.

[0031] Fig. 9 A cross-sectional view of a particle collection box.

[0032] Fig.10 for Fig. 9 A partial enlarged view of middle A.

[0033] The text labels shown in the figure are as follows: 1. Defluorination tank; 2. Air inlet; 3. Particle feeding structure; 4. Intercepting mesh plate; 5. Air outlet; 6. Particle discharge pipe; 7. Particle collection box; 8. Opening and closing door; 9. Residual gas conveying pipe; 10. Three-way joint; 11. Water-cooled inlet pipe; 12. Water-cooled collecting pipe; 13. Annular water pipe; 17. Support mounting seat; 18. Support spring; 19. Support arc block; 20. Particle laying mesh plate; 21. Particle feeding pipe; 22. Particle input port; 23. Sealing cover; 24. Particle pushing rod; 25. Particle pushing block; 26. Particle pushing motor; 27. Particle pushing shaft; 28. Spiral reamer; 31. Particle collection feed port; 32. Particle collection mesh plate; 33. Conveying connector; 34. Joint intercepting net. DETAILED DESCRIPTION

[0034] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0036] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0037] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0038] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0039] like Figure 1-3 As shown, the integrated defluorination and dust removal equipment for electrolytic aluminum fume treatment provided by the present invention comprises a defluorination tank 1, the upper end of the defluorination tank 1 is provided with an air inlet 2, the lower end is provided with an air outlet 5, and the air outlet 5 is connected to the bag dust collector through a conveying pipe; the side of the defluorination tank 1 is provided with a particle feeding structure 3 for feeding alumina particles into the defluorination tank 1, the lower bottom of the defluorination tank 1 is provided with an inclined intercepting mesh plate 4, and the part of the defluorination tank 1 at the lowest point of the intercepting mesh plate 4 is connected to a downward inclined particle discharge pipe 6, and the other end of the particle discharge pipe 6 is connected to a particle collection box 7.

[0040] The flue gas generated by electrolytic aluminum is passed into the defluorination tank from the air inlet 2. Prior to this, alumina particles are fed into the defluorination tank 1 through the particle feeding structure 3. In the subsequent continuous process of flue gas entering, alumina particles are fed into the particle feeding structure 3 at certain intervals according to the amount of flue gas entering. The flue gas entering the defluorination tank 1 will have harmful gases (such as fluorides and sulfides) adsorbed by the alumina particles. After that, the flue gas will flow out from the air outlet 5 and enter the bag filter through the pipeline for dust removal. The alumina particles will be intercepted by the interception mesh 4 and enter the particle discharge pipe 6 along the interception mesh 4 (the mesh is smaller than the alumina particles and can pass the smoke and dust), and then enter the particle collection box 7 for collection. In the specific use process, a manual or automatic valve can be set at the particle discharge pipe 6, so that the alumina particles can be kept in the defluorination tank for a longer time, thereby better utilizing the adsorption effect of the alumina particles.

[0041] like Figure 1 As shown, the lower part of the particle collection box 7 is connected to the residual gas delivery pipe 9 through a delivery connector 33, and a joint interception net 34 for intercepting alumina particles is arranged in the delivery connector 33. The residual gas delivery pipe 9 and the gas outlet 5 are connected to the same three-way connector 10, and the other interface of the three-way connector 10 is connected to the bag filter through a pipeline.

[0042] The design of the residual gas delivery pipe 9 can pass the flue gas mixed in the particles into the bag-type dust collector. The pipeline delivered to the bag-type dust collector or the bag-type dust collector itself will be equipped with an air pump to inhale the smoke. Example 1

[0043] like Figure 5-6 As shown, the particle feeding structure 3 includes a particle feeding pipe 21 installed on the side of the defluorination tank 1 and connected to the tank body, and a particle placing mesh plate 20 located in the defluorination tank 1 and below the particle feeding pipe 21 for receiving the alumina particles sent out by the particle feeding pipe 21. The particle placing mesh plate 20 generally adopts a mesh plate that is inclined downward by 2-5 degrees with the horizontal plane, and the mesh of the mesh plate is smaller than the alumina particles, which can be passed by the flue gas. The other end of the particle feeding pipe 21 is an opening and is equipped with a sealing cover 23. The upper part of the outer end of the particle feeding pipe 21 is equipped with a particle input port 22, and the particle feeding pipe 21 is equipped with a pushing structure for pushing the alumina particles therein into the particle placing mesh plate 20. The pushing structure includes a particle pushing rod 24 that passes through the sealing cover 23, and one end of the particle pushing rod 24 located in the particle feeding pipe 21 is connected to a particle pushing block 25.

[0044] The particle feeding operation of this embodiment is as follows: in the initial state, the particle pushing rod 24 and the particle pushing block 25 are at a position away from the defluorination tank, and then alumina particles are fed through the particle feeding port 22. During the feeding process, the alumina particles are gradually pushed into the defluorination tank 1 through the reciprocating motion of the particle pushing rod 24 and the particle pushing block 25 until some particles fall onto the particle laying mesh plate 20, thereby completing the preliminary preparation work. In the subsequent use process, it is necessary to supplement the alumina particles according to the amount of flue gas introduced. The supplementation process is still to feed through the particle feeding port 22, and then reciprocate through the particle pushing rod 24. In the process of supplementation, the outlet end of the particle feeding pipe 21 is always piled with alumina particles, so as to avoid the escape of harmful gases from the particle feeding pipe 21 when supplementing the material. Example 2

[0045] like Figure 7As shown, the particle feeding structure 3 includes a particle feeding pipe 21 installed on the side of the defluorination tank 1 and connected to the tank body, and a particle laying mesh plate 20 located in the defluorination tank 1 and below the particle feeding pipe 21 for receiving the aluminum oxide particles sent out by the particle feeding pipe 21. The particle laying mesh plate 20 generally adopts a mesh plate that is inclined downward by 2-5 degrees with the horizontal plane, and the mesh of the mesh plate is smaller than the aluminum oxide particles, so that the flue gas can pass through. The other end of the particle feeding pipe 21 is open and equipped with a sealing cover 23. The outer end of the particle feeding pipe 21 is The upper end is equipped with a particle input port 22, and the particle feed pipe 21 is equipped with a pushing structure for pushing the alumina particles therein into the particle placing mesh plate 20, the pushing structure includes a particle pushing motor 26 installed on the outside of the sealing cover 23 and a particle pushing shaft 27 driven by the particle pushing motor 26 and located in the particle feed pipe 21, a spiral reamer 28 (constituting an auger structure) is connected to the particle pushing shaft 27, and there is a gap between the port of the particle feed pipe 21 connected to the defluorination tank 1 and the end of the particle pushing shaft 27.

[0046] The particle feeding operation of this embodiment is as follows: in the initial state, alumina particles are fed into the particle feeding pipe 21 through the particle feeding port 22, and then the particle pushing shaft 27 is driven to rotate by the particle pushing motor 26, and then the alumina particles are pushed into the defluorination tank 1 through the formed auger structure. Since there is a gap between the port connecting the particle feeding pipe 21 with the defluorination tank 1 and the end of the particle pushing shaft 27, the alumina particles cannot be directly pushed into the particle placing plate by the auger structure, but are squeezed by the subsequent continuously delivered alumina particles, so that the alumina particles are gradually squeezed into the defluorination tank 1 and then fall onto the particle placing mesh plate 20. This design can prevent harmful gases from escaping from the particle feeding pipe 21, and the subsequent alumina particles can be replenished by repeating the above operation. Example 3

[0047] In both Example 1 and Example 2, alumina particles are placed through a particle placing screen 20 inclined at a small angle (2-5 degrees). When the particles are replenished, the particles that have completed adsorption fall along the inclined surface. In this case, the particles may fall before they are fully adsorbed, or they may not fall after adsorption (this situation is not a big problem because there are replenished particles).

[0048] Based on the above situation, further solution optimization is carried out, such as Figure 8As shown, the particle laying mesh plate 20 is hingedly mounted on the inner wall of the defluorination tank 1, and a support mounting seat 17 is arranged on the inner wall of the defluorination tank 1, and a vertical support spring 18 is installed on the support mounting seat 17, and a support arc block 19 is connected to the upper end of the support spring 18, and the support arc block 19 is used to support the particle laying mesh plate 20. The parameters of the support spring 18 are set. When there are no aluminum oxide particles on the particle laying mesh plate 20, the angle between the particle laying mesh plate 20 and the horizontal plane is 0-2 degrees. When aluminum oxide particles for absorbing harmful gases are installed on the particle laying mesh plate 20, the oxygen The placement of alumina particles will increase the overall gravity of the particle placing mesh 20, which will then compress the support spring, that is, the angle between the particle placing mesh 20 and the horizontal plane is 2-5 degrees. When replenishing alumina particles, during the replenishment process, as the alumina particles increase, the particle placing mesh 20 will continue to compress the support spring 18, and then the angle with the horizontal plane will be greater than 5 degrees. This ensures that when replenishing alumina particles, the adsorbed alumina particles can be better discharged, and during the adsorption process of the alumina particles, the alumina particles will not fall off easily.

[0049] The driving components such as the cylinder and the motor of the above structure can better adapt to the environment inside the tank.

[0050] like Figure 1-4 As shown, annular water pipes 13 are evenly arranged in the defluorination tank 1 from top to bottom, and each annular water pipe 13 is equipped with a water-cooling inlet pipe 11 and a water-cooling outlet pipe passing through the defluorination tank 1, and all water-cooling outlet pipes are connected to a water-cooling manifold 12 arranged on the outer wall of the defluorination tank 1, and the particle feeding structure 3 is located on both sides of the defluorination tank 1, and the upper and lower parts of each annular water pipe 13 are equipped with a particle feeding structure 3.

[0051] The flue gas from electrolytic aluminum has a relatively high temperature, generally above 120 degrees Celsius. The present application uses a plurality of annular water pipes 13 to cool the high-temperature flue gas entering the defluorination tank 1, and can collect the heat of the flue gas through heat exchange for other uses. After the cooling water enters the annular water pipe 13 from the water-cooling inlet pipe 11 for heat exchange, all the water will enter the water-cooling collecting pipe 12, and then it will be transported to other places for use. At the same time, through the design of multiple particle feeding structures 3, while avoiding interference with the annular water pipe, it can have a better effect of adsorbing and removing harmful gases such as fluorine.

[0052] like Figure 9-10As shown, the particle collecting box 7 is provided with a particle collecting feed port 31 cooperating with the particle discharging pipe 6, and an odd number of particle collecting mesh plates 32 (the mesh size is smaller than that of alumina particles and can pass smoke and dust) are arranged in the particle collecting box 7, and the particle collecting mesh plates 32 are all inclined plates, and the inclined directions of adjacent particle collecting mesh plates 32 are opposite, and the lowest particle collecting mesh plates 32 are connected to the inner wall of the far-away closing door 8, and there is a gap between it and all the particle collecting mesh plates 32 and the opening and closing door 8 and the inner wall of the far-away closing door 8, and the high end of the lower layer must exceed the low end of the upper layer.

[0053] Alumina particles enter from the particle collection feed port 31, enter the top particle collection mesh plate 32 by inertia, and then continue to slide down, and then enter the next layer of particle collection mesh plate 32, until entering the bottom layer of particle collection mesh plate 32. The smoke and dust carried by the alumina particles will fall from the particle collection mesh plate 32 during the multiple slides of the alumina particles, and enter and be sucked into the residual gas delivery pipe 9. After the alumina particles accumulate to a certain amount, the opening and closing door 8 can be opened to take the alumina particles away.

[0054] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. An integrated defluorination and dust removal device for treating aluminum electrolysis flue gas, comprising a defluorination tank, an air inlet is arranged at the upper end of the defluorination tank, an air outlet is arranged at the lower end, and the air outlet is connected to a bag dust collector through a conveying pipeline; characterized in that: A particle feeding structure for feeding alumina particles into the defluorination tank is arranged on the side of the defluorination tank, an inclined intercepting mesh plate is arranged at the lower bottom of the defluorination tank, and a downward inclined particle discharge pipe is connected to the lowest part of the defluorination tank at the intercepting mesh plate, and the other end of the particle discharge pipe is connected to a particle collection box.

2. The integrated defluorination and dust removal equipment for electrolytic aluminum fume treatment according to claim 1 is characterized in that: The lower part of the particle collection box is connected to a residual gas delivery pipe through a delivery connector, the residual gas delivery pipe and the gas outlet are connected to the same three-way joint, and the other interface of the three-way joint is connected to the bag dust collector through a pipeline.

3. The integrated defluorination and dust removal equipment for electrolytic aluminum fume treatment according to claim 1 or 2, characterized in that: The particle feeding structure includes a particle feeding pipe installed on the side of the defluorination tank and connected to the tank body, and a particle placing mesh plate located in the defluorination tank and below the particle feeding pipe 2 for receiving the aluminum oxide particles sent out by the particle feeding pipe. The other end of the particle feeding pipe is open and is equipped with a sealing cover. The upper part of the outer end of the particle feeding pipe is equipped with a particle input port, and the particle feeding pipe is equipped with a pushing structure for pushing the aluminum oxide particles inside the particle feeding pipe into the particle placing mesh plate.

4. The integrated defluorination and dust removal equipment for electrolytic aluminum fume treatment according to claim 3 is characterized in that: The pushing structure comprises a particle pushing rod penetrating the sealing cover, and one end of the particle pushing rod located in the particle feeding pipe is connected with a particle pushing block.

5. The integrated defluorination and dust removal equipment for electrolytic aluminum fume treatment according to claim 3 is characterized in that: The pushing structure comprises a particle pushing motor installed outside the sealing cover and a particle pushing shaft driven by the particle pushing motor and located in the particle feeding pipe, wherein a spiral reamer is connected to the particle pushing shaft.

6. The integrated defluorination and dust removal equipment for electrolytic aluminum fume treatment according to claim 5 is characterized in that: There is a distance between the port of the particle feeding pipe communicating with the defluorination tank and the end of the particle pushing shaft.

7. The integrated defluorination and dust removal equipment for electrolytic aluminum fume treatment according to claim 1 or 2, characterized in that: Annular water pipes are evenly arranged in the defluorination tank from top to bottom, and each annular water pipe is equipped with a water cooling inlet pipe and a water cooling outlet pipe passing through the defluorination tank, and all the water cooling outlet pipes are connected to the water cooling manifold arranged on the outer wall of the defluorination tank.

8. The integrated defluorination and dust removal equipment for electrolytic aluminum fume treatment according to claim 7 is characterized in that: The particle feeding structures are located on both sides of the defluorination tank, and the upper part and the lower part of each annular water pipe are equipped with a particle feeding structure.

9. The integrated defluorination and dust removal equipment for electrolytic aluminum fume treatment according to claim 2 is characterized in that: The particle collection box is provided with a particle collection feed port matched with the particle discharge pipe, and an odd number of particle collection mesh plates are arranged in the particle collection box, all of which are inclined plates, and the inclined directions of adjacent particle collection mesh plates are opposite.

10. The integrated defluorination and dust removal equipment for electrolytic aluminum fume treatment according to claim 9, characterized in that: The lowest particle collecting mesh plate is connected to the inner wall far away from the closing door, and there is a gap between it and all particle collecting mesh plates and the opening and closing door and the inner wall far away from the closing door.

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