A dust removal method using atomized magnetite powder

Abstract

The present invention discloses a dust removal method utilizing atomized magnetite powder, belonging to the technical field of multi-phase coal dust removal processes. The method addresses the problems of poor dust removal effectiveness and high water consumption in the prior art using a combination of spray and water film. The method comprises supplying atomized droplets containing magnetite powder and a dusty airflow into a processing chamber. Dust in the dusty airflow is captured by the atomized droplets to form solid-liquid two-phase droplets, thereby performing a primary dust removal on the dusty airflow. After the primary dust removal, the airflow and the atomized droplets entrained with dust flow to a microporous plate. The entrained atomized droplets and spray water form a water film on the micropores of the microporous plate, which then performs a secondary dust removal on the dusty airflow. The present invention can be used for coal dust removal.

Description

Technical Field

[0001] The invention belongs to the technical field of multi-phase coal dust removal technology, and in particular relates to a dust removal method using atomized magnetite powder. Background Art

[0002] A large amount of dust is generated during the mining, transportation and processing of coal, so the dust airflow needs to be removed.

[0003] Existing dust removal methods usually use a combination of spray and water film to remove dust. On the one hand, the spray causes water to diffuse into atomized droplets in the air, and the atomized droplets collide with the dust to capture the dust. On the other hand, the water forms a water film on the mesh plate, capturing the dust flowing through the water film, thereby achieving the dust removal effect.

[0004] However, due to the large size of the atomized droplets, the dust removal effect is poor and the water consumption is high. Summary of the Invention

[0005] In view of the above analysis, the present invention aims to provide a dust removal method using atomized magnetite powder to solve the problems of poor dust removal effect and high water consumption in the existing technology using a combination of spray and water film.

[0006] The purpose of the present invention is mainly achieved through the following technical solutions.

[0007] The present invention provides a dust removal method using atomized magnetite powder, comprising the following steps:

[0008] Step 1: Atomized droplets containing magnetite powder and a dusty airflow are supplied into the processing chamber. The dust in the dusty airflow is captured by the atomized droplets to form solid-liquid two-phase droplets, thereby performing a dust removal operation on the dusty airflow.

[0009] Step 2: After the first dust removal, the airflow and the atomized droplets carrying dust flow to the microporous plate. The atomized droplets and spray water form a water film on the micropores of the microporous plate, and the water film performs secondary dust removal on the dust airflow.

[0010] Furthermore, in the above-mentioned dust removal method using atomized magnetite powder, the following steps are further included after step 2:

[0011] Step a: Place the electromagnetic perforated plate behind the microperforated plate along the flow direction of the dust airflow;

[0012] Step b: During the dust removal process, the electromagnetic orifice plate is energized, and the dust is adsorbed on the surface of the microporous plate facing away from the electromagnetic orifice plate under the action of the electromagnetic orifice plate;

[0013] Step c: The magnetite powder uses its own adsorption characteristics to adsorb dust to obtain solid particles;

[0014] Step e: Dust in the solid particles is washed away from the magnetite powder by spraying water.

[0015] Furthermore, the aperture ratio of the microporous plate to the electromagnetic aperture plate is 1:(50-65).

[0016] Furthermore, the pore size of the microporous plate is 5 to 10 μm, and the pore size of the electromagnetic plate is 0.3 to 0.6 mm.

[0017] Furthermore, step e also includes the following steps:

[0018] After dust removal, the electromagnetic orifice plate is powered off, allowing the magnetite powder to separate from the microporous plate and face the surface of the electromagnetic orifice plate, completing the recovery of the magnetite powder.

[0019] Furthermore, in the above-mentioned dust removal method using atomized magnetite powder, the process of step 1 and step 2 further includes the following steps:

[0020] An intake dust concentration detector is used to monitor the intake dust concentration of the dust airflow in real time;

[0021] If the inlet dust concentration and / or the outlet dust concentration exceeds a threshold, the flow rate of the dust airflow is reduced, the flow rate of the atomized droplets of the magnetite powder is increased, and / or the flow rate of the spray water is increased.

[0022] Furthermore, in the above-mentioned dust removal method using atomized magnetite powder, the process of step 1 and step 2 further includes the following steps: using an outlet dust concentration detector to monitor the outlet dust concentration of the dust airflow in real time;

[0023] If the inlet dust concentration and / or the outlet dust concentration exceeds a threshold, the flow rate of the dust airflow is reduced, the flow rate of the atomized droplets of the magnetite powder is increased, and / or the flow rate of the spray water is increased.

[0024] Furthermore, before step 1, the following steps are also included:

[0025] Step A: feeding magnetite powder and water into a mixing drum;

[0026] Step B: stirring magnetite powder and water to obtain a magnetite powder suspension;

[0027] Step C: The suspension pipe extracts part of the magnetite powder suspension from the magnetite powder suspension and supplies it to the atomization unit, and the atomization unit sprays out atomized droplets of the magnetite powder.

[0028] Furthermore, in step B, the stirring speed of the magnetite powder and water is 100 to 500 r / min.

[0029] Furthermore, in step C, during the process of extracting a portion of the magnetite powder suspension from the magnetite powder suspension by the suspension tube, a liquid level sensor is used to monitor the liquid level of the mixing drum in real time.

[0030] Compared with the prior art, the present invention can achieve at least the following beneficial effects:

[0031] The dust removal method provided by the present invention mixes magnetite powder into atomized droplets and adopts a solid-liquid two-phase flow dust removal method. The magnetite powder can secondary crush the atomized droplets to achieve secondary atomization, reduce the particle size of the atomized droplets, effectively improve the atomization effect, and reduce water consumption.

[0032] In the present invention, the above-mentioned technical solutions can be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages will become apparent from the description or be understood through practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the embodiments of the description and the contents particularly pointed out in the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like parts throughout the drawings.

[0034] Figure 1 A flow chart of the dust removal method using atomized magnetite powder provided by the present invention;

[0035] Figure 2 A schematic structural diagram of a dust removal device used in the dust removal method using atomized magnetite powder provided by the present invention;

[0036] Figure 3 This is a schematic diagram of the process of pollutant discharge and powder removal in the dust removal method using atomized magnetite powder provided by the present invention.

[0037] Reference numerals:

[0038] 1-mixing drum; 2-air compressor; 3-atomizer; 4-atomizing droplet nozzle; 5-spraying head; 6-microporous plate; 7-electromagnetic orifice plate; 8-reciprocating drive mechanism; 9-connecting rod; 10-guide rail; 11-processing chamber; 12-suspension liquid pipe; 13-air supply pipe; 14-liquid regulating valve; 15-air regulating valve; 16-inlet dust concentration detector; 17-outlet dust concentration detector; 18-guide groove; 19-sewage chamber; 20-connecting shaft; 21-air flow outlet; 22-rotating fan; 23-air flow inlet; 24-magnetite powder chamber; 25-stirring wheel; 26-water inlet pipe; 27-mineral powder feeding port; 28-filter; 29-liquid level sensor. DETAILED DESCRIPTION

[0039] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0040] The present invention provides a dust removal method using atomized magnetite powder. Figure 1 , including the following steps:

[0041] Step 1: Atomized droplets containing magnetite powder and a dusty airflow are supplied into the processing chamber 11. Dust in the dusty airflow is captured by the atomized droplets to form solid-liquid two-phase droplets, thereby performing a dust removal operation on the dusty airflow.

[0042] Step 2: After the first dust removal, the airflow and the atomized droplets containing dust flow to the microporous plate 6. The atomized droplets and spray water form a water film on the micropores of the microporous plate 6, and the water film performs secondary dust removal on the dust airflow.

[0043] Compared with the existing technology, the dust removal method provided by the present invention mixes magnetite powder into atomized droplets and adopts a solid-liquid two-phase flow dust removal method. The magnetite powder can secondary crush the atomized droplets to achieve secondary atomization, reduce the particle size of the atomized droplets, effectively improve the atomization effect, and reduce water consumption.

[0044] In order to further improve the dust removal effect, the dust removal method further includes the following steps:

[0045] Step a: Place the electromagnetic perforated plate 7 behind the microperforated plate 6 along the flow direction of the dust airflow;

[0046] Step b: During the dust removal process, the electromagnetic orifice plate 7 is energized, and the electromagnetic orifice plate 7 adsorbs the surface of the microporous plate 6 facing away from the electromagnetic orifice plate 7;

[0047] Step c: The magnetite powder uses its own adsorption characteristics to adsorb dust to obtain solid particles;

[0048] Step e: Dust in the solid particles is washed away from the magnetite powder by spraying water.

[0049] For example, the pore size of the microporous plate 6 is 5-10 μm, and the pore size of the electromagnetic orifice plate 7 is 0.3-0.6 mm.

[0050] In order to recycle the magnetite powder, the above step e further includes the following steps:

[0051] After dust removal, the electromagnetic orifice plate 7 is powered off, so that the magnetite powder is separated from the surface of the microporous plate 6 facing away from the electromagnetic orifice plate 7, thereby completing the recovery of the magnetite powder.

[0052] In order to monitor the dust removal effect in real time, the dust removal method further includes the following steps:

[0053] An intake dust concentration detector 16 is used to monitor the intake dust concentration of the dust airflow in real time;

[0054] The outlet dust concentration detector 17 is used to monitor the outlet dust concentration of the dust airflow in real time;

[0055] If the inlet dust concentration and / or the outlet dust concentration exceeds a threshold, the flow rate of the dust airflow is reduced, the flow rate of the atomized droplets of the magnetite powder is increased, and / or the flow rate of the spray water is increased.

[0056] In order to obtain atomized droplets of magnetite powder, the following steps are further included before step 1:

[0057] Step A: feeding magnetite powder and water into a mixing drum 1;

[0058] Step B: stirring magnetite powder and water to obtain a magnetite powder suspension;

[0059] Step C: The suspension pipe 12 extracts a portion of the magnetite powder suspension from the magnetite powder suspension and supplies the extracted portion to the atomizing unit, which sprays atomized droplets of the magnetite powder.

[0060] In order to obtain a stable magnetite powder suspension, in the above step B, the stirring speed of the magnetite powder and water is 100 to 500 r / min.

[0061] Considering that the height of the liquid level in the mixing drum 1 directly affects the performance of the extracted magnetite powder suspension, in the above step C, when the suspension pipe 12 extracts part of the magnetite powder suspension from the magnetite powder suspension, the liquid level sensor 29 is used to monitor the liquid level of the mixing drum 1 in real time.

[0062] For example, for the structure of the dust removal device, specifically, see Figures 2 to 3 It includes a processing chamber 11 and a suspension preparation unit, an atomizing unit, a spray head 5, a microporous plate 6, an electromagnetic orifice plate 7 and a rotating fan 22 arranged in sequence along the flow direction of the dust airflow. The atomized droplet outlet of the atomizing unit, the spray head 5, the microporous plate 6, the electromagnetic orifice plate 7 and the rotating fan 22 are all located in the processing chamber 11. An airflow inlet 23 is provided at one end of the processing chamber 11, and an airflow outlet 21 is provided at the other end; the water spraying direction of the spray head 5 is toward the microporous plate 6, and the spray water sprayed by the spray head 5 forms a water film on the microporous plate 6; during the dust removal process, the electromagnetic orifice plate 7 is energized, so that the magnetite powder is adsorbed on the surface of the microporous plate 6 facing away from the electromagnetic orifice plate 7. After the dust removal is completed, the electromagnetic orifice plate 7 is de-energized, so that the magnetite powder is separated from the surface of the microporous plate 6 facing away from the electromagnetic orifice plate 7.

[0063] Based on the dust removal device of the above structure, the specific dust removal method is as follows:

[0064] Turn on the rotating fan 22 to generate negative pressure in the processing chamber 11, and the dust airflow flows through the airflow inlet 23 and is sucked into the processing chamber 11. The magnetite powder suspension prepared by the suspension preparation unit is sprayed into the processing chamber 11 through the atomization unit as atomized droplets of magnetite powder. While being sprayed, the magnetite powder in the atomized droplets performs a secondary crushing on the atomized droplets to obtain atomized droplets with smaller particle size. The atomized droplets collide with the dust airflow. During the collision, the dust in the dust airflow is captured by the atomized droplets to form solid-liquid two-phase droplets. The dust airflow is subjected to a dust removal operation, and some of the solid-liquid two-phase droplets gather and fall down, while the remaining solid-liquid two-phase droplets continue to flow. After the first dust removal operation, the airflow and the atomized droplets carrying the dust flow to the microporous plate 6, and the atomized droplets and the spray water sprayed from the spray head 5 form a dust filter on the micropores of the microporous plate 6. The water film performs secondary dust removal on the dust airflow, and the atomized droplets gather on the microporous plate 6 to form a water flow and a water film and flow down in a stream; during the dust removal process, the electromagnetic orifice plate 7 is energized, and the magnetite powder separated from the atomized droplets uses its own adsorption characteristics to perform tertiary dust removal on the dust in the airflow after the secondary dust removal, and condenses into solid particles. The solid particles are adsorbed on the surface of the microporous plate 6 facing away from the electromagnetic orifice plate 7 under the action of the electromagnetic orifice plate 7. The dust in the solid particles is washed away from the magnetite powder in the process of the water flow and the water film flowing down, and flows down together with the water flow and the water film; the airflow after dust removal passes through the micropores of the microporous plate 6 and the plate holes of the electromagnetic orifice plate 7, and finally flows out from the airflow outlet 21, completing the dust removal of the dust airflow; after dust removal, the electromagnetic orifice plate 7 is powered off, so that the magnetite powder is separated from the surface of the microporous plate 6 facing away from the electromagnetic orifice plate 7, completing the recovery of the magnetite powder.

[0065] For the structure of the suspension preparation unit, see Figure 2, including a mixing drum 1, a mixing wheel 25, a water inlet pipe 26, a mineral powder feeding port 27 and a suspension pipe 12. The mixing drum 1 is placed on a mounting surface (for example, the ground) through a barrel bracket. The mixing wheel 25 is placed in the mixing drum 1 and is located at the bottom of the mixing drum 1. The mixing wheel 25 is rotatably connected to the bottom of the mixing drum 1 through a bearing. The water inlet pipe 26 is communicated with the lower part of the mixing drum 1. The water inlet direction of the water inlet pipe 26 is along the tangential direction of the mixing drum 1. The mineral powder feeding port 27 is opened at the top of the mixing drum 1. Magnetite powder is added to the mixing drum 1 through the mineral powder feeding port 27. The suspension pipe 12 passes through the top of the mixing drum 1 and extends to below the liquid level of the mixing drum 1. This suspension preparation unit, on the one hand, makes the water in the mixing drum 1 fully swirl through the tangential water inlet from below and the rotation of the stirring wheel 25, thereby strengthening the turbulent flow effect of the water, promoting the mixing of water and magnetite powder, and facilitating the generation of magnetite powder suspension; on the other hand, since the water inlet is tangential from the bottom and the powder is inlet from the top of the mixing drum 1, the magnetite powder suspension in the middle position of the mixing drum 1 is relatively stable and uniform, and the liquid is directly taken from the middle position of the mixing drum 1 through the suspension pipe 12, and then connected to the subsequent dust removal device, and supplied to the dust removal device under the negative pressure suction of the subsequent dust removal device for coal dust removal, which can effectively reduce the sedimentation of the magnetite powder suspension during the transportation and filtration process.

[0066] In order to filter the magnetite powder suspension entering the suspension pipe 12 and avoid clogging subsequent equipment, the suspension preparation unit further includes a filter screen 28 provided at the liquid inlet end of the suspension pipe 12, through which the magnetite powder suspension is pre-filtered.

[0067] As for the structure of the atomization unit, specifically, it includes an air compressor 2, an atomizer 3 and an atomizing droplet nozzle 4. The atomizer 3 is fixedly connected to the processing chamber 11 through an atomizer bracket, the suspension tube 12 is connected to the inlet end of the atomizer 3, the air outlet of the air compressor 2 is connected to the inlet end of the atomizer 3 through an air supply pipe 13, the inlet end of the atomizer 3 is connected to the outlet end of the atomizer 3 through a metal tube, the outlet end of the atomizer 3 is threadedly connected to the atomizing droplet nozzle 4, the inlet end of the atomizer 3 is located outside the processing chamber 11, the outlet end of the atomizer 3 is located at the center position in the processing chamber 11 and the mist outlet direction is the same as the flow direction of the dust airflow.

[0068] It is understandable that in order to adjust the mist output of the atomizing unit and the particle size of the atomized liquid droplets, the atomizing unit further includes a liquid regulating valve 14 provided on the suspension pipe 12 and an air regulating valve 15 provided on the air supply pipe 13 .

[0069] In order to realize the collection of dust and sewage, the above-mentioned dust removal device also includes a guide groove 18 arranged below the atomized droplet outlet and the spray head 5 and a sewage chamber 19 arranged below the microporous plate 6. The guide groove 18 is connected to the sewage chamber 19. The guide groove 18 and the sewage chamber 19 are located outside the processing chamber 11. In this way, during the flow of the dust airflow and the atomized droplets of magnetite powder, the dust airflow and the atomized droplets of magnetite powder can fall into the guide groove 18 after condensation, and further flow into the sewage chamber 19. The atomized droplets gather into water flow and water film on the microporous plate 6 and can flow into the sewage chamber 19, thereby realizing the collection of dust and sewage.

[0070] Similarly, in order to realize the collection and recovery of magnetite powder, the above-mentioned dust removal device also includes a magnetite powder chamber 24 provided below the microporous plate 6. The magnetite powder chamber 24 is located outside the processing chamber 11. The magnetite powder detached from the surface of the microporous plate 6 facing away from the electromagnetic hole plate 7 can fall into the magnetite powder chamber 24, thereby realizing the collection and recovery of magnetite powder.

[0071] In practical applications, it is necessary to separate dust, sewage and magnetite powder. The above-mentioned dust removal device also includes a slide rail assembly. The microporous plate 6 is slidably connected to the processing chamber 11 through the slide rail assembly. Along the flow direction of the dust airflow, the guide groove 18, the sewage chamber 19 and the magnetite powder chamber 24 are arranged in sequence; the microporous plate 6 has a sewage discharge state and a powder removal state. When the microporous plate 6 is in the sewage discharge state, the microporous plate 6 slides along the slide rail to the top of the sewage chamber 19. When the microporous plate 6 is in the powder removal state, the microporous plate 6 slides along the slide rail to the top of the magnetite powder chamber 24.

[0072] It is understood that in order to drive the reciprocating motion of the microporous plate 6, so as to switch between the sewage discharge state and the powder removal state, the structure of the slide rail assembly is specifically described in detail. Figure 3 , including a guide rail 10, a reciprocating drive mechanism 8 and a connecting rod 9. The microplate 6 is slidably connected to the processing chamber 11 through the guide rail 10, and the microplate 6 is connected to the reciprocating drive mechanism 8 through the connecting rod 9. The reciprocating drive mechanism 8 can drive the microplate 6 to perform reciprocating motion.

[0073] Since magnetite powder contains water, it is easy to adhere to the microporous plate 6 and cannot be separated. In addition, dust in sewage is also easy to deposit on the microporous plate 6. In order to promote the separation of dust and magnetite powder, the above-mentioned microporous plate 6 is provided with a connecting shaft 20. The connecting shaft 20 has a through hole opened in the axial direction. The cross-sectional shape of the through hole is a long strip. One end of the connecting rod 9 is inserted into the through hole and there is a gap between the connecting rod 9 and the hole wall of the through hole in the vertical direction. The guide rail 10 is arranged in the processing chamber 11 and can be rotated in the horizontal direction. The cross-sectional shape of the guide rail 10 parallel to the movement direction of the microporous plate 6 is a triangle.

[0074] Based on the structure of the above slide rail assembly, the process of sewage discharge and powder removal is as follows:

[0075] The microporous plate 6 is in the sewage discharge state and is located at the lowest point of the guide track 10 (i.e., the end close to the air flow inlet 23, the height of the lowest point is 0), and the microporous plate 6 gradually moves upward along the guide track 10. At the same time, the end of the connecting shaft 20 moves upward in the through hole, and the gap between the through hole and the connecting shaft 20 adapts to the displacement of the microporous plate 6 in the vertical direction; when the microporous plate 6 reaches the highest point of the guide track 10 and continues to move, it will suddenly detach from the guide track 10, fall in the vertical direction and vibrate. At this time, the microporous plate 6 is in the powder removal state, and the vibration causes the magnetite powder to immediately detach from the microporous plate 6. At the same time, the guide track 10 rotates 180°; the microporous plate 6 is located on the guide track 10 (i.e., the end away from the air flow inlet 23, the height of the lowest point is 0), the microporous plate 6 gradually moves upward along the guide track 10, and at the same time, the end of the connecting shaft 20 moves upward in the through hole, and the displacement of the microporous plate 6 in the vertical direction is adapted to the gap between the through hole and the connecting shaft 20; when the microporous plate 6 reaches the highest point of the guide track 10 and continues to move, it will suddenly break away from the guide track 10, fall in the vertical direction and generate vibration. At this time, the microporous plate 6 is in a sewage discharge state, and the vibration causes the dust to immediately break away from the microporous plate 6. At the same time, the guide track 10 rotates 180 degrees; repeating the above movement process can achieve complete separation of dust and magnetite powder, see Figure 3 .

[0076] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A dust removal method using atomized magnetite powder, characterized in that: The steps include: Step 1: Atomized droplets containing magnetite powder and a dusty airflow are supplied into the processing chamber. The dust in the dusty airflow is captured by the atomized droplets to form solid-liquid two-phase droplets, thereby performing a dust removal operation on the dusty airflow. Step 2: After the primary dust removal, the airflow and the atomized droplets carrying dust flow to the microporous plate. The atomized droplets carrying dust and the spray water form a water film on the micropores of the microporous plate, and the water film performs secondary dust removal on the dust airflow; The step 2 further includes the following steps: Step a: Place the electromagnetic perforated plate behind the microperforated plate along the flow direction of the dust airflow; Step b: During the dust removal process, the electromagnetic orifice plate is energized, and the magnetite powder is adsorbed on the surface of the microporous plate facing away from the electromagnetic orifice plate under the action of the electromagnetic orifice plate; Step c: The magnetite powder uses its own adsorption characteristics to adsorb dust to obtain solid particles; Step e: dust in the solid particles is washed away from the magnetite powder by spraying water.

2. The dust removal method using atomized magnetite powder according to claim 1, characterized in that: The aperture ratio of the microporous plate to the electromagnetic aperture plate is 1: (50-65).

3. The dust removal method using atomized magnetite powder according to claim 2, characterized in that: The pore size of the microporous plate is 5-10 μm, and the pore size of the electromagnetic pore plate is 0.3-0.6 mm.

4. The dust removal method using atomized magnetite powder according to claim 1, characterized in that: Step e also includes the following steps: After dust removal, the electromagnetic orifice plate is powered off, so that the magnetite powder is separated from the surface of the microporous plate facing away from the electromagnetic orifice plate, thereby completing the recovery of the magnetite powder.

5. The dust removal method using atomized magnetite powder according to claim 1, characterized in that: The process of step 1 and step 2 also includes the following steps: An intake dust concentration detector is used to monitor the intake dust concentration of the dust airflow in real time; If the dust concentration in the intake air exceeds a threshold, the flow rate of the dust airflow is reduced, the flow rate of the atomized droplets of the magnetite powder is increased, and / or the flow rate of the spray water is increased.

6. The dust removal method using atomized magnetite powder according to claim 1, characterized in that: The process of step 1 and step 2 also includes the following steps: Use an outlet dust concentration detector to monitor the outlet dust concentration of the dust airflow in real time; If the dust concentration in the outlet gas exceeds a threshold, the flow rate of the dust airflow is reduced, the flow rate of the atomized droplets of the magnetite powder is increased, and / or the flow rate of the spray water is increased.

7. The dust removal method using atomized magnetite powder according to any one of claims 1 to 6, characterized in that: The following steps are also included before step 1: Step A: feeding magnetite powder and water into a mixing drum; Step B: stirring magnetite powder and water to obtain a magnetite powder suspension; Step C: The suspension pipe extracts a portion of the magnetite powder suspension from the magnetite powder suspension and supplies the suspension to the atomization unit, and the atomization unit sprays atomized droplets of the magnetite powder.

8. The dust removal method using atomized magnetite powder according to claim 7, characterized in that: In step B, the stirring speed of the magnetite powder and water is 100-500 r / min.

9. The dust removal method using atomized magnetite powder according to claim 7, characterized in that: In the step C, during the process of extracting a portion of the magnetite powder suspension from the magnetite powder suspension by the suspension tube, a liquid level sensor is used to monitor the liquid level of the mixing drum in real time.

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