Dry process for producing zinc oxide and cooling and collecting the product

Abstract

The application relates to the technical field of zinc oxide preparation, and particularly discloses a dry-process zinc oxide cooling and collecting device, which comprises a multistage filtering and recycling unit, a rotary drum cloth bag filtering unit, a powder grading collecting box and a negative pressure suction unit. The multistage filtering and recycling unit comprises a plurality of filtering boxes arranged side by side, the lower end of each filtering box is provided with a first collecting hopper, the first collecting hopper is connected with the powder grading collecting box, a filter screen frame is arranged in each filtering box, a filter screen is arranged in the filter screen frame, and adjacent two filtering boxes are connected through a connecting channel. The dry-process zinc oxide cooling and collecting device disclosed by the application realizes the grading, screening and collecting of zinc oxide powder according to the size, the filter cloth can be used for real-time filtering through the rotation effect, the dust adhered to the outer surface of the cloth bag can be swept off in real time, and the filter cloth can always maintain good filtering and retaining effects.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of zinc oxide preparation, and particularly discloses a dry-process zinc oxide cooling and collecting device. BACKGROUND

[0002] Preparation of zinc oxide is mainly divided into dry process and wet process, and the dry process is suitable for large-scale production of enterprises, and the specific preparation process is that zinc ore materials are heated to form a molten solution, the solution continues to evaporate to form zinc vapor, and the zinc vapor is contacted with air to be oxidized, then cooled, and finally the zinc oxide in the air is deposited and collected through a filter bag. The existing cooling and collecting device for dry-process zinc oxide mainly adopts a bag collector, and the zinc oxide powder airflow is sucked into the inside of the collector under the action of negative pressure, and then the zinc oxide powder is filtered and intercepted through a plurality of arrayed high-temperature-resistant bags.

[0003] For example, the application patent with the application number 2021108840623 discloses an efficient zinc oxide filtering and collecting device, which comprises a collecting box, a material collecting hopper, a feeding system and a negative pressure air duct. The upper end of the columnar shell collecting box is provided with a partition plate, a plurality of filter bag assemblies extending into the lower end of the collecting box are installed on the partition plate of the columnar shell, a dust striking plate is arranged directly below the partition plate of the columnar shell, and a through hole corresponding to each filter bag assembly is formed in the dust striking plate, and a power assembly for driving the dust striking plate to rise and instantaneously fall is further arranged on the partition plate of the columnar shell. The efficient zinc oxide filtering and collecting device disclosed by the application can filter and intercept the zinc oxide powder through the filter bag assemblies. However, the device can only filter and collect the zinc oxide powder, and cannot classify the filtered and intercepted zinc oxide powder according to particle size, and the zinc oxide powder airflow only enters from one side of the collecting box, so that the powder on the surface of the filter assembly close to the inlet end is seriously attached, while the filter assembly away from the inlet end can still filter and intercept the powder, and the airflow in the collecting box is disturbed during the compressed air backflushing process, and needs to be rested for a period of time before the suction filtering can be continued. Based on the above technical problems existing in the cooling and collecting of the zinc oxide powder by the existing bag-type filtering collector, the application provides a dry-process zinc oxide cooling and collecting device which can effectively solve the above technical problems. SUMMARY

[0004] The application aims to provide a dry-process zinc oxide cooling and collecting device to solve the technical problems existing in the cooling and collecting of the zinc oxide powder by the existing bag-type filtering collector.

[0005] The application is achieved by the following technical scheme:

[0006] A dry zinc oxide production cooling and collection device includes a multi-stage filtration and recovery unit, a rotary bag filter unit, a powder classification and collection box, and a negative pressure suction unit. The multi-stage filtration and recovery unit includes multiple filter boxes arranged side by side. A first collection hopper is provided at the lower end of each filter box, and the first collection hopper is connected to the powder classification and collection box. A filter screen frame is provided in each filter box, and a filter screen is provided in the filter screen frame. Adjacent filter boxes are connected by a connecting channel. A feeding channel is provided on one of the filter boxes at the far end, and a guide pipe connected to the rotary bag filter unit is provided on the other filter box at the far end.

[0007] The rotary bag filter unit includes a cylindrical outer shell with a second collection hopper at the lower end. Inside the cylindrical outer shell, a sealed cylindrical filter frame is concentrically arranged. Filter cloth is provided on the outer surface of the cylindrical filter frame. A hollow tube is concentrically fixed in the cylindrical filter frame. The upper end of the hollow tube is rotatably connected to a bearing on the upper surface of the cylindrical outer shell. The cylindrical outer shell is equipped with a transmission mechanism for driving the hollow tube to rotate. The upper end of the hollow tube is rotatably connected to a negative pressure suction unit. Several suction slits are opened along the axial direction in the hollow tube located inside the cylindrical filter frame.

[0008] As a further provision of the above solution, a strip-shaped storage box is provided on the outer circular surface of the cylindrical shell along the axial direction. A brush strip is provided in the strip-shaped storage box, and the brush strip has bristles on the side facing the cylindrical filter frame. A telescopic drive component for driving the brush strip to move radially is provided on the strip-shaped storage box.

[0009] As a further provision of the above scheme, a rotating support is provided in the second collection hopper, and a connecting shaft connected to the rotating support is provided at the lower end of the cylindrical filter frame.

[0010] As a further provision of the above scheme, the transmission mechanism includes a motor, a drive gear is provided on the output shaft of the motor, and a driven gear that meshes with the drive gear is provided on the hollow tube extending out of the cylindrical filter frame.

[0011] As a further feature of the above scheme, a vertically downward baffle is provided in the middle of the top wall of each filter box, and an arc-shaped plate is provided at the upper end of the side of the filter box corresponding to the connecting channel. The top of the filter screen frame is connected to the top wall of the filter box, and the lower end of the filter screen frame is tightly fitted to the upper surface of the arc-shaped plate.

[0012] As a further feature of the above scheme, the end of the arc-shaped plate is provided with an upwardly protruding baffle, and a material discharge slot is opened on the arc-shaped plate located on one side of the baffle. The top of the filter screen frame is rotatably connected to the filter box.

[0013] As a further arrangement of the above-mentioned scheme, the top end of the filter screen frame is provided with a shaft rod extending out of the side of the filter box, the outer end of the shaft rod is connected with a swing bar, and the filter box is provided with an action mechanism for driving all swing bars to rotate simultaneously and reset instantaneously.

[0014] As a further arrangement of the above-mentioned scheme, the action mechanism comprises a moving bar arranged to move horizontally above the plurality of filter boxes, and a spring connected between the moving bar and the filter box, the moving bar is provided with a convex column corresponding to each swing bar, the swing bar is provided with a waist slot hole for acting with the convex column, and the filter box is provided with a cam motor, and the cam motor is provided with a cam block acting on the end of the moving bar.

[0015] As a further arrangement of the above-mentioned scheme, the pore size of the filter screen in the plurality of filter boxes is gradually reduced, and the powder grading collection box is provided with a grading area connected with the lower end of each first collecting hopper.

[0016] The zinc oxide cooling and collecting device disclosed by the application is used for preparing zinc oxide powder by a dry method, and the zinc oxide powder airflow is introduced into the feeding channel, then passes through the plurality of filter boxes arranged side by side, and is filtered by the filter screens with multiple pore sizes.

[0017] Then, the zinc oxide powder with the smallest particle size that is not filtered by the filter screen needs to be filtered by the cloth bag, at this time, the zinc oxide powder introduced into the rotary drum cloth bag filtering unit is in contact with the filter cloth on the outer surface of the cylindrical filter frame in the rotating process through the flow guide pipe, and the pressure inside the filter cloth is smaller than the pressure outside the filter cloth due to the continuous suction of the hollow pipe by the negative pressure suction unit, then the introduced zinc oxide powder is all filtered and retained by the cloth bag, and the filtered gas is discharged from the whole device by the negative pressure suction unit, and the zinc oxide powder with a small particle size falls into the second collecting hopper. During the whole filtering process, the continuous rotation of the cylindrical filter frame can ensure that all surfaces of the filter cloth can be effectively used for filtering the powder, and the utilization rate of the cloth bag is improved.

[0018] In addition, the application further provides a brush bar and a telescopic driving member, and the bristles on the brush bar are pushed into contact with the filter cloth during the rotation of the filter cloth with the cylindrical filter frame, and the zinc oxide powder attached to the surface of the filter cloth is scraped off by the rotation of the filter cloth itself, so that the filter cloth always maintains good filtering and retaining effect.

[0019] Finally, the multi-stage filtering and recycling unit in the application can filter and intercept the zinc oxide powder airflow for a long time. When the mesh holes of the filter screen are blocked by large zinc oxide powder particles, the moving bar can be moved horizontally by the action mechanism, and the spring can be stretched or compressed to store energy during the horizontal movement of the moving bar. Then, when the moving bar moves to the end, it will move in the opposite direction, thereby impacting the blocking bar at the lower end of the filter screen frame in all filter boxes. Through the impact, the powder particles blocked on the filter screen are shaken off, so that all filter screens can be automatically dredged, ensuring the grading filtering effect of zinc oxide powder during long-term operation.

[0020] Compared with the prior art, the application has at least the following beneficial effects:

[0021] The dry method zinc oxide cooling and collecting device disclosed in the application can first grade and screen the zinc oxide powder according to size through the multi-stage filtering and recycling unit when collecting the zinc oxide powder. The screened zinc oxide powder can automatically fall into the powder grading and collecting box to complete automatic grading, which effectively solves the deficiency that the existing bag collector cannot grade and collect the zinc oxide powder.

[0022] The cooling and collecting device disclosed in the application adopts a bag that is sleeved on the outer surface of the cylindrical filter frame. Then, the inside of the bag is subjected to negative pressure suction, and the cylindrical filter frame is driven to rotate, so that the incoming zinc oxide powder airflow can uniformly act on all surfaces of the bag, improving the filtering utilization rate of the bag. In addition, the bag surface during rotation can be cleaned by using a cleaning mechanism such as a brush bar and brush, so that the dust attached to the outer surface of the bag can be swept off in real time, so that the filter cloth can always maintain good filtering and intercepting effect.

[0023] The application further rotates the filter screen frame and sets an arc-shaped plate at the lower end thereof. The end of the arc-shaped plate is provided with a corresponding blocking bar. When the filter screen is blocked, all filter screen frames can be moved away from the blocking bar by the action mechanism, and then impact the blocking bar instantaneously. The vibration generated during the impact process can shake off the powder particles blocked on the filter screen, so that all filter screens can be automatically dredged, ensuring the grading filtering effect of zinc oxide powder during long-term operation. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creating laborious work.

[0025] Figure 1 It is a first angle three-dimensional structure schematic view of the application.

[0026] Figure 2 Second angle perspective view of the application;

[0027] Figure 3 Internal perspective view of the multi-stage filtration and recovery unit in the application;

[0028] Figure 4 Internal perspective view of the rotating drum cloth bag filtration unit in the application;

[0029] Figure 5 Three-dimensional assembly structure of the cylindrical filter frame and filter cloth in the application;

[0030] Figure 6 Three-dimensional structure of the moving strip, filter screen frame, swing strip, etc. in the application;

[0031] Figure 7 Enlarged structure of A in the application; Figure 1

[0032] Figure 8 Enlarged structure of B in the application. Figure 2 DETAILED DESCRIPTION

[0033] In order to enable persons skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative labor should fall within the scope of protection of the present application.

[0034] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. Figures 1-8 Embodiment 1

[0035] Embodiment 1 discloses a dry process zinc oxide cooling and collecting device, which refers to the accompanying drawings and the accompanying description. Figure 1 and the accompanying description. Figure 2 ​​​The main body comprises a multi-stage filtering and recycling unit 100, a rotary drum cloth bag filtering unit 200, a powder grading collection tank 300 and a negative pressure suction unit 400. The zinc oxide powder airflow first enters the multi-stage filtering and recycling unit 100 for multiple filtering. The zinc oxide powder of different particle sizes filtered down enters the corresponding area of the powder grading collection tank 300. Then the zinc oxide powder airflow filtered by multiple stages enters the rotary drum cloth bag filtering unit 200 for filtering and retention. The multi-stage filtering and recycling unit 100 and the rotary drum cloth bag filtering unit 200 are provided with negative pressure airflow by the negative pressure suction unit 400 throughout the process, so that the airflow flows along the set path.

[0036] Reference is made to the accompanying drawings Figure 1 and the accompanying drawings Figure 3 The multi-stage filtering and recycling unit 100 comprises a plurality of filtering boxes 101 arranged side by side. The lower end of each filtering box 101 is provided with a first collecting hopper 102, which is connected to the corresponding area of the powder grading collection tank 300 through a discharge pipe at the lower end of the first collecting hopper 102. In the present embodiment, three filtering boxes 101 are provided. The left side surface of the leftmost filtering box 101 is provided with an inlet channel 103 at the upper end. The connecting channel 104 is arranged between the upper ends of the adjacent two filtering boxes 101. The right side surface of the rightmost filtering box 101 is provided with a flow guide pipe 105 connected to the rotary drum cloth bag filtering unit 200.

[0037] A baffle 106 is arranged at the middle position of the top wall of the filtering box 101 and extends vertically downward. When the zinc oxide powder airflow enters the upper end of the filtering box 101, it will first contact the baffle 106, then flow along the lower end of the baffle 106 to the inner cavity of the filtering box 101 on the right side of the baffle 106, and the zinc oxide powder particles settled in the process can be collected in the first collecting hopper 102. An arc-shaped plate 107 is arranged at the upper end of the right side surface of the filtering box 101. The connecting channel 104 is arranged between the arc-shaped plate 107 and the top wall of the filtering box 101. A filter screen frame 108 is arranged on the top wall of the filtering box 101, and the lower end of the filter screen frame 108 tightly abuts the upper surface of the arc-shaped plate 107. A filter screen 109 is arranged on the filter screen frame 108. In the present embodiment, the mesh size of the filter screen 109 gradually decreases from left to right.

[0038] Reference is made to the accompanying drawings Figure 4 and the accompanying drawings Figure 5The rotary drum bag filter unit 200 comprises a cylindrical shell 201, a second collecting hopper 202 is connected to the lower end of the cylindrical shell 201, a cylindrical filter frame 203 is concentrically arranged in the cylindrical shell 201, the upper and lower ends of the cylindrical filter frame 203 are sealingly arranged, then a layer of filter cloth 204 is wrapped on the outer surface of the cylindrical filter frame 203, and the two ends of the filter cloth 204 are tightly fixed on the outer surface of the cylindrical filter frame 203 through the edge pressing strip 205. The rotary support 206 is fixed in the second collecting hopper 202, the connecting shaft 207 connected with the rotary support 206 is arranged at the center of the lower surface of the cylindrical filter frame 203. The hollow pipe 208 is fixedly connected to the center of the upper surface of the cylindrical filter frame 203, the lower end of the hollow pipe 208 extends into the cylindrical filter frame 203, and a plurality of suction slits 2081 are formed on the hollow pipe 208 in the axial direction. The bearing connected with the hollow pipe 208 is arranged at the center of the upper surface of the cylindrical shell 201, so that the hollow pipe 208 is rotatably connected with the bearing and extends out of the upper end of the cylindrical shell 201, and then the negative pressure suction unit 400 is connected to the top end of the hollow pipe 208.

[0039] Reference is made to the accompanying drawings Figure 1 and the accompanying drawings Figure 4 The specific negative pressure suction unit 400 comprises the air suction fan 401, the suction pipe 402 is connected to the air suction fan 401, and the connecting piece 403 sealingly and rotatably connected with the top end of the hollow pipe 208 is arranged at the end of the suction pipe 402. At the same time, the gear transmission mechanism 209 for driving the hollow pipe 208 is arranged on the upper surface of the cylindrical filter frame 203, the gear transmission mechanism comprises the driven gear arranged on the hollow pipe 208, the motor is arranged on the upper surface of the cylindrical filter frame 203, the driving gear meshing with the driven gear is arranged on the motor, and in order to avoid the influence of zinc oxide dust on the gear meshing transmission, the dust cover is arranged on the top wall of the cylindrical filter frame 203, which can isolate the gear transmission mechanism 209 from the inner cavity of the cylindrical shell 201.

[0040] In addition, the embodiment is further provided with a strip-shaped receiving box 210 arranged along the axial direction on the outer side of the columnar shell 201, a telescopic driving element 211 arranged on the outer side of the strip-shaped receiving box 210, a brush strip 212 arranged in the interior of the strip-shaped receiving box 210, and the end of the telescopic driving element 211 is connected with the brush strip 212, and then bristles are arranged on the side of the brush strip 212 facing the center of the columnar shell 201. When a large amount of zinc oxide powder is attached to the outer surface of the filter cloth 204 on the cylindrical filter frame 203, resulting in an increased filtering resistance and a poor filtering retention effect, the telescopic driving element 211 is directly started to move the brush strip 212 towards the direction of the cylindrical filter frame 203, and then during the rotation of the cylindrical filter frame 203, the bristles on the side of the brush strip 212 can brush off all the zinc oxide powder on the surface of the filter cloth 204, and the brushed-off zinc oxide powder falls into the second collecting hopper 202. Finally, a screw conveyor 213 capable of directional conveying is arranged at the lower end of the second collecting hopper 202, and the screw conveyor 213 is used to directionally convey away the zinc oxide powder. Embodiment 2

[0041] Embodiment 2 discloses a dry-process zinc oxide cooling and collecting device which is improved on the basis of the technical scheme in embodiment 1, and the same parts as those in embodiment 1 will not be described again.

[0042] With reference to the accompanying drawings Figure 3 , the accompanying drawings Figure 6 , the accompanying drawings Figure 7 , and the accompanying drawings Figure 8 , the embodiment 2 is provided with a shaft 110 at the upper end of each filter screen frame 108, and the shaft 110 is located at the center of the arc-shaped plate 107, the upper end of the filter screen frame 108 is rotationally connected with the inner walls on the front and back sides of the filtering box 101 through the shaft 110, and the lower end of the filter screen frame 108 is always attached to the upper surface of the arc-shaped plate 107 during the rotation of the filter screen frame 108. Meanwhile, the arc-shaped plate 107 is connected with an upwardly protruding blocking strip 1071 at the end thereof, and a material falling strip opening is formed in the arc-shaped plate 107 at the blocking strip 1071.

[0043] A swing strip 111 is connected with the same end of each shaft 110 extending out of the side of the filtering box 101, and a waist groove hole is formed along the length direction of the swing strip 111. A protruding column is inserted in each waist groove hole, and a moving strip 112 is connected with one end of all the protruding columns. In order to ensure the horizontal left-right movement of the moving strip 112, a fixed plate 113 is fixed on the upper surface of the filtering box 101, the fixed plate 113 is provided with a guide sliding rail, and a limiting sliding groove 114 is formed on the corresponding side of the moving strip 112. Meanwhile, a spring 115 is connected between the fixed plate 113 and the moving strip 112.

[0044] Finally, a cam motor 116 is fixed on the last filter box 101, a cam block 117 is connected on the motor shaft of the cam motor 116, and a wear-resistant round end 118 is arranged on the end of the moving bar 112 and abuts against the cam block 117.

[0045] When the multi-stage filter recovery unit 100 is operated for a period of time, the filter effect is found to be reduced and the suction resistance is increased, which indicates that the mesh of the filter screen 109 is blocked. At this time, the cam motor 116 is started to make the cam block 117, and then the cam block 117 acts on the wear-resistant round end 118 at the end of the moving bar 112, so that the moving bar 112 moves and compresses or stretches the spring 115.

[0046] When the cam block 117 rotates to the highest point, the moving bar 112 is instantaneously reset under the action of the spring 115, and then the action between the cam column and the swing bar 111 makes the lower end of all the filter screen frames 108 hit the corresponding stop bar 1071. Under the action of the impact, the blockage on the surface of the filter screen 109 is vibrated and shaken off, so that the self-cleaning of the filter screen 109 is realized.

[0047] The above is only the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A cooling and collecting device for dry zinc oxide production, characterized in that, The system includes a multi-stage filtration and recovery unit, a rotary bag filter unit, a powder classification and collection box, and a negative pressure suction unit. The multi-stage filtration and recovery unit includes multiple filter boxes arranged side by side. The lower end of each filter box is provided with a first collection hopper, which is connected to the powder classification and collection box. Each filter box is provided with a filter screen frame, and a filter screen is provided in the filter screen frame. Adjacent filter boxes are connected by a connecting channel. One of the filter boxes at the far end is provided with a feeding channel, and the other filter box at the far end is provided with a guide pipe connected to the rotary bag filter unit. The rotary bag filter unit includes a cylindrical shell with a second collection hopper at the lower end. Inside the cylindrical shell, a sealed cylindrical filter frame is concentrically arranged. Filter cloth is provided on the outer surface of the cylindrical filter frame. A hollow tube is concentrically fixed in the cylindrical filter frame. The upper end of the hollow tube is rotatably connected to a bearing on the upper surface of the cylindrical shell. The cylindrical shell is equipped with a transmission mechanism for driving the hollow tube to rotate. The upper end of the hollow tube is rotatably connected to a negative pressure suction unit. Several suction slits are opened along the axial direction in the hollow tube located inside the cylindrical filter frame. Each of the filter boxes has a vertically downward baffle plate in the middle of its top wall, and an arc plate is provided on the upper end of the side of the filter box corresponding to the connecting channel. The top of the filter frame is connected to the top wall of the filter box, and the lower end of the filter frame is in close contact with the upper surface of the arc plate. The end of the arc-shaped plate is provided with an upwardly protruding baffle, and a material discharge slot is opened on the arc-shaped plate located on one side of the baffle. The top of the filter screen frame is rotatably connected to the filter box. The top of the filter frame is provided with a shaft extending out of the side of the filter box, and the outer end of the shaft is connected to a swing bar. The filter box is provided with a mechanism for driving all the swing bars to rotate simultaneously and instantly reset. The filter screens in the multiple filter boxes are configured with progressively smaller pore sizes, and the powder grading collection box is provided with a grading zone connected to the lower end of each first collection hopper.

2. The dry zinc oxide production cooling and collection device according to claim 1, characterized in that, The outer circular surface of the cylindrical shell is provided with a strip-shaped storage box along the axial direction. The strip-shaped storage box is provided with a brush strip, and the brush strip is provided with bristles on the side facing the cylindrical filter frame. The strip-shaped storage box is provided with a telescopic drive component for driving the brush strip to move radially.

3. The dry zinc oxide production cooling and collection device according to claim 1, characterized in that, The second collection hopper is equipped with a rotating support, and the lower end of the cylindrical filter frame is equipped with a connecting shaft that is connected to the rotating support.

4. The dry zinc oxide production cooling and collection device according to claim 1, characterized in that, The transmission mechanism includes a motor, with a drive gear mounted on the output shaft of the motor, and a driven gear meshing with the drive gear mounted on the hollow tube extending from the cylindrical filter frame.

5. The dry zinc oxide production cooling and collection device according to claim 1, characterized in that, The operating mechanism includes a moving bar that moves horizontally above multiple filter boxes, and a spring connects the moving bar to the filter box. The moving bar is provided with a protrusion corresponding to each swing bar, and the swing bar is provided with a waist groove hole that acts on the protrusion. The filter box is provided with a cam motor, and the cam motor is provided with a cam block that acts on the end of the moving bar.

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