A true stone paint waste gas treatment equipment and method

Abstract

This invention discloses a device and method for treating waste gas from stone paint, comprising a shell with an exhaust port at the top, a first inlet pipe, a second inlet pipe, and a first motor. The lower half of the shell is a horizontally arranged semi-cylindrical silo section. The first and second inlet pipes are respectively connected to the arc surface of the silo section and are located on opposite sides of the silo section's axis. The silo section contains an outer cylinder and multiple sieve plates. The outer cylinder is located on the silo section's axis and passes through both ends of the silo section. The outer cylinder and the silo section are rotatably sealed together. The sieve plates are evenly spaced around the outer cylinder. The first motor drives the outer cylinder to rotate relative to the silo section. This invention treats the paint mist through four processes: granulation, spheroidization, drying, and screening separation, transforming the waste gas into a rapidly recyclable solid additive for stone paint. This not only efficiently treats organic waste gas and protects the environment but also produces high-value-added products, greatly improving enterprise efficiency.

Description

Technical Field

[0001] This invention relates to the field of waste gas treatment technology, and in particular to a waste gas treatment device and method for stone paint. Background Technology

[0002] Stone-like paint is a decorative coating commonly used on building exteriors. It mimics the texture of natural stone and is therefore also known as "imitation stone paint." The main components of stone-like paint include emulsion, natural colored sand, additives, and water. The emulsion can be acrylic, silicone-acrylic, or pure acrylic. The natural colored sand typically has a particle size between 40-120 mesh. It is produced through processes such as premixing, homogenizing, conditioning, and filtration. Each process stage generates a large amount of waste gas, which contains not only a large amount of organic matter to be cross-linked and polymerized but also a large amount of stone sand powder. Existing dust removal and filtration systems struggle to simultaneously treat this mixed waste gas, easily causing internal adhesion and blockage problems.

[0003] Patent CN106621669A discloses a method for treating exhaust gas to recover paint mist. This method involves using a mist-generating device to produce liquid mist with a paint-affinity atomizing liquid, which is then introduced into a treatment chamber or forms liquid mist within the chamber. The paint-affinity atomizing liquid is a paint thinner or a paint-affinity material. When the exhaust gas enters the treatment chamber, the paint mist particles in the exhaust gas come into contact with the paint-affinity liquid mist and form large-diameter, viscous, colloidal particles. These colloidal particles separate from the exhaust gas under the influence of gravity or inertial forces, including centrifugal force, forming extractable or outflowable paint liquid. The paint liquid is then collected and recovered by the collection device of the atomization absorption device. This method uses the principle of similar compatibility to recover paint mist using liquid oleophilic materials. However, it cannot handle solid powder in the exhaust gas of stone paint, requiring an additional filtration system for further treatment, making the process rather cumbersome.

[0004] Patent CN103170422B discloses a paint recycling device for a spray booth. It sprays excess liquid paint mist during the spraying process onto a polyester needle-punched felt filter paper containing a layer of lime powder under the action of a circulating fan. The liquid paint mist mixes with the lime powder and is adsorbed onto the lime powder. Subsequently, a cleaning air pump is used to blow off and recycle the solid paint accumulated on the filter paper film, thus achieving the treatment of paint mist waste gas. However, the paint mist sprayed on the filter paper will cross-link and eventually form a film structure, which not only blocks the filter paper pores and affects subsequent filtration, but also the resulting sheet-like solid paint has little recycling value.

[0005] How to effectively treat the exhaust gas from stone paint, ensure the long-term stable operation of the treatment equipment, and generate high-value products for recycling is a key issue that enterprises are focusing on in their research and development. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a real stone paint exhaust gas treatment equipment and method to solve the problems of the prior art being unable to simultaneously treat exhaust gas containing organic crosslinking materials and solid powders, as well as the problems of low recycling and utilization of subsequent waste and low added value.

[0007] One objective of this invention is to provide a waste gas treatment device for real stone paint, comprising a shell with an exhaust port on the top, a first air inlet pipe, a second air inlet pipe, and a first motor. The lower half of the shell is a horizontally arranged semi-cylindrical silo section. The first air inlet pipe and the second air inlet pipe are respectively connected to the arc surface of the silo section and are located on opposite sides of the axis of the silo section. The silo section is provided with an outer cylinder and multiple screen plates. The outer cylinder is located on the axis of the silo section and passes through both ends of the silo section. The outer cylinder and the silo section are rotatably sealed together. The screen plates are evenly spaced around the outer cylinder. The first motor is used to drive the outer cylinder to rotate relative to the silo section.

[0008] Preferably, the outer cylinder contains, from the outside in, an inner cylinder, an auger, and a rotating shaft. The outer cylinder is a cylindrical structure with one open end and has multiple material passage holes, each located between adjacent screen plates. A portion of the inner cylinder is located inside the outer cylinder, and the other portion of the inner cylinder has a discharge port. The inner cylinder has a single feed hole that matches the material passage holes and is located at the top of the inner cylinder. The outer cylinder and the inner cylinder are rotatably and sealingly connected. A support is fixedly installed on the inner cylinder, which is located outside the outer cylinder. The rotating shaft passes through the inner cylinder and is rotatably and sealingly connected to it. The auger is fixedly coiled around the rotating shaft. A first motor drives the outer cylinder to rotate relative to the shell and the inner cylinder. A second motor is installed on the rotating shaft, and the second motor drives the rotating shaft and the auger to rotate relative to the inner cylinder.

[0009] Preferably, the rotating shaft is a tubular structure, and the shaft section inside the inner cylinder is provided with multiple air outlets, and the shaft section outside the inner cylinder is provided with a rotary joint.

[0010] Preferably, the first air inlet pipe and the second air inlet pipe are respectively supplied with wet exhaust gas, and a heater is provided on the second air inlet pipe.

[0011] Preferably, the upper part of the shell is a block compartment section, and a partition plate is provided in the block compartment section to divide the block compartment section into upper and lower parts. Multiple dust collection bags are provided on the partition plate.

[0012] Preferably, a counterweight plate is provided at the bottom of the dust collection bag, and the counterweight plate is fixedly connected to the dust collection bag.

[0013] Preferably, the counterweight plate is provided with a rotating rod, the two ends of the rotating rod are respectively rotatably connected to the counterweight plate, a magnet is fixedly provided on the rotating rod, and an iron magnetic head that attracts the magnet is provided at the end of the sieve plate away from the outer cylinder.

[0014] Preferably, the dust bags are spaced apart, and the bottom ends of multiple dust bags extend downward to form an arc-shaped surface that matches the movement trajectory of the ferromagnetic head. There are multiple magnets, which are evenly distributed around the surface of the rotating rod. The same-pole sides of the magnets are all facing the axis of the rotating rod, and the magnetic poles of the multiple magnets on each rotating rod have the same polarity.

[0015] The second objective of this invention is to provide a method for treating exhaust gas from stone paint, comprising the following steps:

[0016] S1. Dry powder is placed in the silo section to form a fluidized bed;

[0017] S2. Wet exhaust gas is introduced into the silo section through the first air inlet pipe. The wet exhaust gas acts as a binder and comes into contact with the dry powder in the silo section to form irregular solid material.

[0018] S3. The sieve plate agitates the fluidized bed, causing irregular solid materials to continuously roll and combine with the binder multiple times to form round solid granules.

[0019] S4. Dry hot air is introduced into the silo section through the second air inlet pipe;

[0020] S5. The round solid particles continue to grow, and are screened by the sieve plate and transferred to the other side of the silo section, where they are dried after contacting the hot air that enters through the second air inlet pipe.

[0021] S6. The dried solid granules pass through the feed hole and feed port in sequence under the action of the screen plate, and are discharged from the silo section under the action of the screw conveyor, forming a granular product that imitates natural colored sand.

[0022] Preferably, in step S4, a portion of the wet exhaust gas is heated by a heater and introduced into the silo section as dry exhaust gas. The paint mist in the exhaust gas cross-links to form solid paint powder to continuously replenish the dry powder reduced in the silo section.

[0023] The present invention has the following advantages:

[0024] 1. A method for treating waste gas from real stone paint is disclosed, in which the paint mist in the wet waste gas undergoes four processes: bonding with dry powder to form a solid material, rolling and enlarging, drying, and screening and separation, in order to treat the waste gas into a real stone paint solid additive that can be quickly recycled. This method not only efficiently treats organic waste gas and protects the environment, but also produces high value-added products, greatly improving the company's efficiency.

[0025] 2. A real stone paint exhaust gas treatment device is disclosed. By setting multiple screen plates on the outer cylinder and driving them to rotate continuously, it can not only stir the mixed dry powder and disperse the large solid materials that are bonded into small particles, but also realize the function of transporting round particles during the rotation. With the cooperation of the inner cylinder and the auger, the dry powder and solid materials are quickly separated.

[0026] 3. The magnetic head installed at the end of the sieve plate attracts the magnet installed at the bottom of the dust bag. During the rotation of the sieve plate, it can drive multiple dust bags to swing left and right, realizing the automatic dust cleaning function of the dust bags and ensuring the long-term operation of the equipment. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0028] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure at point A in the middle;

[0029] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure at point B in the middle;

[0030] Figure 4 yes Figure 1 Schematic diagram of the oblique section structure;

[0031] Figure 5 yes Figure 2 Enlarged view of a portion of point C in the middle;

[0032] Figure 6 This is a cross-sectional view of the heater.

[0033] In the diagram, 1. Shell; 2. Silo section; 3. Block silo section; 4. Exhaust port; 5. Divider plate; 6. Dust collector bag; 7. First air inlet pipe; 8. Second air inlet pipe; 9. Outer cylinder; 10. Screen plate; 11. Material passage hole; 12. Inner cylinder; 13. Feed hole; 14. Rotating shaft; 15. Screwdriver; 16. Discharge port; 17. First motor; 18. Second motor; 19. Air outlet; 20. Rotary joint; 21. Bevel gear; 22. Support; 23. Counterweight plate; 24. Rotating rod; 25. Magnet; 26. Ferromagnetic head; 27. Heater; 28. Outer layer; 29. ​​Heating wire; 30. Inner layer. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0036] A type of equipment for treating exhaust gas from stone paint, such as Figure 1 As shown, the system includes a housing 1 with an exhaust port 4 at the top, a first intake pipe 7, a second intake pipe 8, a first motor 17, a second motor 18, and a heater 27. The lower half of the housing 1 is a horizontally arranged semi-cylindrical silo section 2, and the upper half of the housing 1 is a block silo section 3. The first intake pipe 7 and the second intake pipe 8 are multiple branch pipes that together form the main pipeline. The first intake pipe 7 and the second intake pipe 8 are respectively connected to the arc surface at the bottom of the silo section 2, and they are located on opposite sides of the axis of the silo section 2. Figure 2 As shown, the left side of silo section 2 is the polymerization section, and the right side of silo section 2 is the drying section. Wet exhaust gas is introduced into the first air inlet pipe 7. The wet exhaust gas contains uncondensed and dried paint mist. Hot air or hot exhaust gas heated by heater 27 is introduced into the second air inlet pipe 8. The dry powder filling part of silo section 2 forms a fluidized bed.

[0037] like Figure 2 , Figure 3As shown, the silo section 2 is equipped with an outer cylinder 9 and multiple screen plates 10. The outer cylinder 9 is a cylindrical structure with one end open. The outer cylinder 9 is located on the axis of the silo section 2 and passes through both ends of the silo section 2. The outer cylinder 9 and the silo section 2 are rotatably sealed together. The screen plates 10 are evenly spaced around the outer cylinder 9. The output end of the first motor 17 is directly connected to the bottom of the outer cylinder 9 to drive the outer cylinder 9 to rotate relative to the silo section 2. The inner cylinder 12, auger 15, and rotating shaft 14 are installed sequentially from the outside to the inside of the outer cylinder 9. Multiple material passage holes 11 are opened on the outer cylinder 9. The material passage holes 11 are rectangular openings, and the length of the material passage holes 11 is less than the length of the silo section 2. Each material passage hole 11 is located between adjacent screen plates 10. A part of the inner cylinder 12 is located inside the outer cylinder 9. The inner cylinder 12 is a tubular structure with both ends sealed. The other part of the inner cylinder 12 is open. A discharge port 16 is provided to discharge the formed granular product. A feed hole 13 matching the feed hole 11 is provided on the inner cylinder 12. The feed hole 13 is also a rectangular hole. There is only one feed hole 13, which is located at the top of the inner cylinder 12. The outer cylinder 9 and the inner cylinder 12 are rotatably sealed together. A support 22 is fixedly connected to the inner cylinder 12 outside the outer cylinder 9, so that the inner cylinder 12 is stationary relative to the ground. The rotating shaft 14 passes through the inner cylinder 12 and is rotatably sealed together with it. The auger 15 is fixedly coiled around the rotating shaft 14. The first motor 17 is used to drive the outer cylinder 9 to rotate relative to the shell 1 and the inner cylinder 12. A bevel gear 21 is installed on the rotating shaft 14. The second motor 18 meshes with the bevel gear 21 to drive it to rotate. The second motor 18 is used to drive the rotating shaft 14 and the auger 15 to rotate relative to the inner cylinder 12.

[0038] like Figure 3 As shown, the rotating shaft 14 is a tubular structure. Multiple air outlets 19 are opened on the rotating shaft 14 located inside the inner cylinder 12. A rotary joint 20 is provided at the end of the rotating shaft 14 located outside the inner cylinder 12. The rotary joint 20 is connected to high-pressure air. The high-pressure airflow enters the inner cylinder 12 through the rotary joint 20, the rotating shaft 14, and the air outlets 19. It blows the excess dry powder adhering to the surface of the granules in the opposite direction to the movement of the granules, and blows it into the shell 1 through the feed hole 13 and the passage hole 11. This avoids the granules carrying out excess dry powder and improves the quality.

[0039] The first intake pipe 7 and the second intake pipe 8 respectively supply wet exhaust gas. A heater 27 is installed on the second intake pipe 8. Figure 6 As shown, the heater 27 includes an outer layer 28 and an inner layer 30 with a cylindrical structure, and a heating wire 29 wound and fixed between the outer layer 28 and the inner layer 30. The exhaust gas passes through the inner layer 30 and is heated by the heating wire 29 to form hot gas.

[0040] like Figure 2 , Figure 4As shown, a partition plate 5 is installed inside the block silo section 3, which divides the block silo section 3 into upper and lower parts. Multiple mounting holes are opened on the partition plate 5, and multiple dust collection bags 6 are fixedly installed in each mounting hole. The dust collection bags 6 can filter and separate the dry powder in the gas that floats out, so that it can be returned to the silo section 2 for reuse.

[0041] To prevent the dust bag 6 from being pushed upwards by the airflow, a counterweight plate 23 is installed at the bottom of the dust bag 6. The counterweight plate 23 is fixedly connected to the dust bag 6 and can straighten the dust bag 6, which is conducive to the filtration of airflow.

[0042] A rotating rod 24 is installed on the counterweight plate 23. The rotating rod 24 is rotatably inserted into the counterweight plate 23. A magnet 25 is fixedly installed on the rotating rod 24. A magnetic head 26 that attracts the magnet 25 is provided at the end of the sieve plate 10 away from the outer cylinder 9. As the sieve plate 10 rotates, it causes the magnetic head 26 to gradually approach and move away from the magnet 25. Under the attraction of the magnet 25, the dust collection bag 6 will sway left and right. The dust accumulated on the dust collection bag 6 will fall off quickly during the swaying process, thus cleaning the filter pores and facilitating dust filtration.

[0043] The magnet's attraction distance is limited. When there are multiple dust bags 6, they are spaced apart, and the bottom ends of the multiple dust bags 6 extend downwards to form an arc-shaped surface that matches the movement trajectory of the magnetic head 26, allowing each dust bag 6 to swing left and right. Multiple magnets 25 are installed; during the left-right swinging process of the magnets 25, the magnets on different dust bags 6 will attract each other, reducing the swing amplitude or even eliminating swing altogether. Figure 5 As shown, multiple magnets 25 are installed on each rotating rod 24. The magnets 25 are evenly distributed around the surface of the rotating rod 24. The same pole side of the magnets 25 are all facing the axis of the rotating rod 24. The magnetic poles of the multiple magnets 25 on each rotating rod 24 are the same, that is, the outer periphery of the magnets 25 are all S or N poles. This makes the different dust bags 6 repel each other because the magnetic poles of the different magnets 25 are the same, and they will not connect during the swinging process.

[0044] Working principle: Dry powder is placed in silo section 2 to form a fluidized bed. The wet exhaust gas from the stone paint is introduced into the first inlet pipe 7 and the second inlet pipe 8 respectively. The heater 27 installed on the first inlet pipe 7 heats the exhaust gas to form hot gas, and the paint mist inside also condenses and polymerizes into dry powder. Dry hot gas is introduced into silo section 2 through the first inlet pipe 7, and the exhaust gas containing the powder to be polymerized is introduced into silo section 2 through the second inlet pipe 8. The wet exhaust gas to be polymerized comes into contact with the dry powder on the fluidized bed above the second inlet pipe 8 and adheres to it. During the drying process, an irregular solid material is formed. The first motor 17 is activated, driving the screen plate 10 to rotate. The screen plate 10 continuously stirs the dry powder and the irregular solid material, causing it to tumble and adhere to the wet exhaust gas, forming round granules that continue to grow. When the particle size exceeds the aperture of the screen plate 10, the counter-clockwise movement of the screen plate 10 pushes the granules to the other side of the silo section 2, above the first air inlet pipe 7. Hot air is then introduced into the first air inlet pipe 7 to dry the granules. Afterwards, the sieve... As plate 10 continues to move to the top, the granules are separated from the fluidized bed by the screen plate 10. Adjacent screen plates 10 form a funnel structure, and the granules pass sequentially through the feed holes 11 and 13 into the inner cylinder 12. The second motor 18 rotates, driving the shaft 14 and auger 15 to rotate. The auger discharges the granules through the outlet 16. The entire process achieves the functions of agglomeration, rounding, drying, separation, and discharge of waste gas, transforming the waste gas from stone paint into high-value-added, natural-looking colored sand particles, reducing the amount of natural colored sand particles. The amount of sand used; some dry powder will also enter the inner cylinder 12 along with the granular material. By passing high-pressure airflow into the rotary joint 20, the dry powder will be blown back in the opposite direction, which can reduce the amount of dry powder discharged; the gas in the silo section 2 and block silo section 3 will be discharged after being filtered by the dust collection bag 6. The dry powder will accumulate on the dust collection bag 6. The iron magnetic head at the end of the screen plate 10 will continuously attract the magnet 25 below the dust collection bag 6 as the screen plate 10 rotates, causing the dust collection bag 6 to swing left and right, so that the dust falls off and the dust collection bag 6 is not blocked.

[0045] Throughout the process, the rotation of the screen plate 10 not only stirs, filters, and separates the granular material, but also controls the left and right swinging of the magnet 25 and the dust bag 6, achieving the continuous cleaning function of the dust bag 6.

[0046] A method for treating exhaust gas from stone paint, based on the aforementioned equipment, such as... Figure 2 As shown, it includes the following steps:

[0047] S1. Dry powder is placed in silo section 2 as a fluidized bed, and the height of the dry powder is lower than that of the outer cylinder 9;

[0048] S2. Wet exhaust gas is introduced into the silo section 2 through the first air inlet pipe 7. The wet exhaust gas acts as an organic binder and comes into contact with the dry powder in the silo section 2 to form irregular solid material.

[0049] S3. The screen plate 10 agitates the fluidized bed, causing irregular solid materials to continuously roll and combine with the binder multiple times to form round solid particles. The agitation of the screen plate 10 can also prevent irregular solid materials from sticking together to form large sheet-like films.

[0050] S4. Dry hot air is introduced into the silo section 2 through the second air inlet pipe 8;

[0051] S5. The round solid particles continue to grow. The small round solid particles and dry powder can be evenly dispersed in the silo section 2 through the sieve holes of the sieve plate 10. The large round solid particles are screened by the sieve plate 10 and transferred to the other side of the silo section 2 and dried after contacting the hot air below.

[0052] S6. After drying, the large solid particles pass through the material passage 11 and the feed hole 13 in sequence under the action of the screen plate 10, and are discharged from the silo section 2 under the action of the screw conveyor 15, forming a granular product that imitates natural colored sand.

[0053] Calcium powder can be selected as the dry powder. Preferably, a portion of the wet exhaust gas is heated by heater 27 and introduced into silo section 2 as dry exhaust gas. The paint mist in the wet exhaust gas cross-links to form solid paint powder. The solid paint powder replaces the calcium powder and can continuously replenish the dry powder reduced in silo section 2.

[0054] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A waste gas treatment device for real stone paint, characterized in that: The system includes a housing (1) with an exhaust port (4) on top, a first intake pipe (7), a second intake pipe (8), and a first motor (17). The lower half of the housing (1) is a horizontally arranged semi-cylindrical silo section (2). The first intake pipe (7) and the second intake pipe (8) are respectively connected to the arc surface of the silo section (2) and are located on opposite sides of the axis of the silo section (2). The silo section (2) is provided with an outer cylinder (9) and multiple sieve plates (10). The outer cylinder (9) is located on the axis of the silo section (2) and passes through both ends of the silo section (2). The outer cylinder (9) is rotatably sealed to the silo section (2). The sieve plates (10) are evenly spaced around the silo section (2). The outer cylinder (9) is configured such that the first motor (17) drives the outer cylinder (9) to rotate relative to the silo section (2). The outer cylinder (9) contains, from the outside in, an inner cylinder (12), an auger (15), and a rotating shaft (14). The outer cylinder (9) is a cylindrical structure with one open end. Multiple material passage holes (11) are provided on the outer cylinder (9), and each material passage hole (11) is located between adjacent screen plates (10). A portion of the inner cylinder (12) is located inside the outer cylinder (9), and another portion of the inner cylinder (12) is provided with a discharge port (16). The inner cylinder (12) is provided with a feed hole (13) that matches the material passage holes (11). The feed hole (13) is one and located within the outer cylinder. At the top of the inner cylinder (12), the outer cylinder (9) is rotatably and sealed to the inner cylinder (12). A support (22) is fixedly installed on the inner cylinder (12) which is located outside the outer cylinder (9). The rotating shaft (14) passes through the inner cylinder (12) and is rotatably and sealed to it. The auger (15) is fixedly coiled around the rotating shaft (14). The first motor (17) is used to drive the outer cylinder (9) to rotate relative to the shell (1) and the inner cylinder (12). A second motor (18) is installed on the rotating shaft (14). The second motor (18) is used to drive the rotating shaft (14) and the auger (15) to rotate relative to the inner cylinder (12). The rotating shaft (14) is a tubular structure. The shaft (14) is located inside the inner cylinder (12) and has multiple air outlets (19). The shaft (14) located outside the inner cylinder (12) has a rotary joint (20) at its end. The upper part of the shell (1) is a block compartment section (3). The block compartment section (3) is equipped with a partition plate (5). The partition plate (5) divides the block compartment section (3) into upper and lower parts. The partition plate (5) is equipped with multiple dust collection bags (6). The bottom end of the dust collection bag (6) is equipped with a counterweight plate (23). The counterweight plate (23) is fixedly connected to the dust collection bag (6). The counterweight plate (23) is equipped with a rotating rod (24). The two ends of the rotating rod (24) are rotatably connected to the counterweight plate (23).A magnet (25) is fixedly mounted on the rotating rod (24), and a magnetic head (26) that attracts the magnet (25) is mounted on the end of the sieve plate (10) away from the outer cylinder (9).

2. The stone paint exhaust gas treatment equipment according to claim 1, characterized in that: The dust bags (6) are spaced apart, and the bottom ends of multiple dust bags (6) extend downward to form an arc-shaped surface that matches the movement trajectory of the ferromagnetic head (26). There are multiple magnets (25), and the magnets (25) are evenly distributed around the surface of the rotating rod (24). The same pole side of each magnet (25) faces the axis of the rotating rod (24), and the magnetic poles of the multiple magnets (25) on each rotating rod (24) have the same polarity.

3. A method for treating exhaust gas from stone paint, based on any one of claims 1-2, characterized in that, Includes the following steps, S1. Dry powder is placed in the silo section (2) as a fluidized bed; S2. Wet exhaust gas is introduced into the silo section (2) through the first air inlet pipe (7). The wet exhaust gas acts as a binder and comes into contact with the dry powder in the silo section (2) to form irregular solid material. S3. The sieve plate (10) agitates the fluidized bed, causing irregular solid materials to roll continuously and combine with the binder multiple times to form round solid granules. S4. Dry hot air is introduced into the silo section (2) through the second air inlet pipe (8); S5. The round solid particles continue to grow. The round solid particles are screened by the screen plate (10) and transferred to the other side of the silo section (2) and dried after contact with the hot air entering through the second air inlet pipe (8). S6. The dried solid granules pass through the feed hole (11) and feed hole (13) in sequence under the action of the sieve plate (10), and are discharged from the silo section (2) under the action of the screw conveyor (15), forming a granular product that imitates natural colored sand.

4. The method for treating waste gas from real stone paint according to claim 3, characterized in that: In step S4, a portion of the wet exhaust gas is heated by a heater (27) and introduced into the silo section (2) as dry exhaust gas. The paint mist in the wet exhaust gas cross-links to form solid paint powder to continuously replenish the dry powder reduced in the silo section (2).

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