A system and method for removing iron from a gypsum powder

Abstract

The application discloses a kind of anhydrite powder iron removal system, magnetic roller mechanism is arranged in the inside of cavity, below feed inlet;Including at least two magnetic rollers, there is gap for gypsum powder to pass between adjacent magnetic rollers;Magnetic roller is divided into two parts with the cross section through its own axis as interface, one part of surface is magnetic surface, another part of surface is non-magnetic surface, and the magnetic surface of adjacent magnetic roller is staggered;Scraper is arranged in the inside of cavity, one scraper is arranged corresponding to each magnetic roller;Box is arranged in the inside of cavity, below scraper;Box is driven by second driving device, moves between the inside and outside of cavity;The application also discloses a method for removing iron by the system.By setting two groups of magnetic rollers rotating towards each other, the magnetic force distribution on the magnetic roller is adjusted;At the same time, the scrap collecting box is improved to solve the technical problems that the scraper cannot remove the iron filings on the magnetic roller completely and the scrap collecting box needs to be cleaned regularly.

Description

Technical Field

[0001] This invention relates to the field of powder processing technology, specifically to an iron removal system and method for calcined gypsum powder. Background Technology

[0002] In the raw material processing process, such as in the chemical, building materials, glass bead, activated carbon, and mineral industries, it is necessary to clean the raw materials. Iron removal equipment is often used to separate ferromagnetic metal impurities mixed in the materials. The purpose is twofold: first, to prevent hard iron impurities from flowing into the next process and causing damage to subsequent equipment; and second, because the product itself has restrictions on the content of iron impurities.

[0003] The existing equipment uses a single magnetic roller for iron removal. During the iron removal process, because the magnetic roller is entirely magnetic, some iron filings or particles are not easily removed by the scraper, requiring regular cleaning of the magnetic roller, resulting in poor iron removal efficiency. Manually cleaning the filings collection box periodically increases labor costs; furthermore, the collection box, with its sealed structure and made of iron, easily accumulates plaster powder, which not only corrodes the box but also poses a risk of injury to personnel during cleaning. Summary of the Invention

[0004] The purpose of this invention is to provide an iron removal system and method for calcined gypsum powder, which sets up two sets of magnetic rollers rotating in opposite directions to adjust the magnetic force distribution on the magnetic rollers; at the same time, the chip collection box is improved to solve the technical problems in the prior art that the scraper cannot completely remove iron filings from the magnetic rollers and that the chip collection box needs to be cleaned regularly.

[0005] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution: a calcined gypsum powder iron removal system, comprising:

[0006] The cavity has an inlet at the top and an outlet at the bottom.

[0007] A magnetic roller mechanism is disposed inside the cavity, below the feed inlet; it includes at least two magnetic rollers, with a gap between adjacent magnetic rollers for gypsum powder to pass through;

[0008] The surface of the magnetic roller includes magnetic and non-magnetic surfaces, which are alternately distributed along its own axis, with each magnetic and non-magnetic surface covering the same area.

[0009] The magnetic roller rotates in the same direction as the powder falls, and is driven to rotate by the first driving device; during the rotation, the magnetic surfaces of adjacent magnetic rollers are staggered.

[0010] A scraper is disposed inside the cavity, with one scraper corresponding to each magnetic roller, and the scraper is in contact with the surface of the magnetic roller.

[0011] The box body is disposed inside the cavity and located directly below the scraper; the box body is driven by a second driving device to move between the inside and outside of the cavity; the side wall of the cavity is provided with a through hole for the box body to pass through.

[0012] Furthermore, the magnetic roller mechanism includes two magnetic rollers rotating in opposite directions; the first driving device includes two gears and a drive motor, the two gears are respectively mounted on the rotating shafts of the two magnetic rollers, the two gears mesh with each other, and the drive motor drives one of the gears to rotate.

[0013] Furthermore, a force-applying device is provided at the scraper, which applies an external force to the scraper to adhere to the magnetic roller.

[0014] Furthermore, the force-applying device includes a hinge seat, a first base, a second base, and a tension spring. The scraper is disposed on the first base, the hinge seat is disposed on the inner wall of the cavity, the first base is hinged to the hinge seat, the second base is disposed on the inner wall of the cavity and located above the first base, and the two ends of the tension spring are respectively connected to the first base and the second base.

[0015] Furthermore, the box is also equipped with a metal scrap identification module, which controls the second drive device;

[0016] When there are iron filings inside the box, the second drive device moves the box to the outside of the cavity; when there are no iron filings inside the box, the second drive device moves the box to the inside of the cavity.

[0017] Furthermore, the bottom plate of the box is hinged relative to the box body. When the box body is in contact with iron filings, the side wall of the cavity at the through hole provides support to the bottom plate, so that the bottom plate and the edge of the bottom of the box body fit together.

[0018] Furthermore, the bottom plate of the box is a filter structure, through which powder passes and iron filings remain; the iron filings identification module is set on the filter structure.

[0019] Furthermore, the filter structure includes a rectangular frame and multiple sets of parallel rods arranged within the rectangular frame, with the gap between adjacent rods being larger than the gypsum powder and smaller than the iron filings.

[0020] Furthermore, the second driving device is a cylinder;

[0021] The rod is made of conductive material and is also part of the iron filings identification module.

[0022] The iron filings identification module also includes a control circuit and a solenoid valve. The solenoid valve is connected in series with the control circuit, and adjacent rods are connected in parallel with the positive and negative terminals of the control circuit, respectively. When iron filings simultaneously contact adjacent rods, the control circuit is activated.

[0023] The solenoid valve is used to control the cylinder.

[0024] To solve the above-mentioned technical problems, the present invention further provides the following technical solution: a method for removing iron from calcined gypsum powder, using the above-mentioned calcined gypsum powder iron removal system, comprising the following steps:

[0025] 1) The magnetic roller adsorbs iron filings in the powder entering the system;

[0026] 2) The scraper scrapes the iron filings off the magnetic roller. Half of the magnetic roller surface is magnetic and the other half is non-magnetic. After the magnetic roller attracts the iron filings, it rotates to the scraper position and continues to rotate. Under the action of the scraper, the iron filings slide relative to the magnetic roller and accumulate at the scraper. This continues until the non-magnetic part of the magnetic roller rotates to the scraper position, at which point the magnetic roller no longer attracts the iron filings, and the iron filings fall into the box.

[0027] 3) The iron filings identification module inside the box identifies the material inside the box; when the iron filings simultaneously contact the adjacent rods at the bottom of the box, the solenoid valve is energized, driving the cylinder to contract and moving the box to the outside of the system.

[0028] 4) The bottom of the box is a hinged structure, which opens under the action of gravity. When there are no iron filings inside the box, the solenoid valve is de-energized, the cylinder is reset, and the box returns to the system.

[0029] 5) Repeat the above steps.

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] 1) A double magnetic roller structure is adopted, with one half of the magnetic roller surface being magnetic and the other half being non-magnetic. During rotation, the magnetic properties of the two magnetic roller surfaces are staggered to ensure that when the plaster passes between the two magnetic rollers, the surface of one magnetic roller is always magnetic to adsorb iron substances in the plaster. When rotating to the scraper position, the magnetic roller continues to rotate, and under the action of the scraper, the iron filings slide relative to the magnetic roller until the non-magnetic part of the magnetic roller rotates to the scraper position, at which point the magnetic roller no longer adsorbs the iron filings, and the iron filings fall into the box.

[0032] 2) An external force is applied to the scraper by a force-applying device to make it adhere to the magnetic roller. As the scraper wears down, it shifts and remains in contact with the magnetic roller.

[0033] 3) The box for collecting iron filings can be automatically tilted. Its bottom is made of multiple rods arranged in parallel. The gypsum powder can slide down from the gaps between adjacent rods, while the iron filings remain on the rods, which serves to filter the quicklime. At the same time, the rods are connected to the positive and negative terminals of the control circuit. When the iron filings come into contact with adjacent rods at the same time, the entire control circuit is connected, and the drive device controls the box to move to the outside of the system to dump the iron filings. Attached Figure Description

[0034] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the internal structure of the iron removal system for calcined gypsum powder according to the present invention;

[0036] Figure 2 This is a schematic diagram of the scraper section of the present invention;

[0037] Figure 3 This is a structural schematic diagram of the box body of the present invention;

[0038] Figure 4 This is a circuit diagram of the iron filings identification module inside the box of the present invention;

[0039] Figure 5 This is a schematic diagram of the alarm module at the scraper of the present invention;

[0040] Figure 6 This is a schematic diagram of the cavity with a guide plate according to the present invention;

[0041] Figure 7 This is a schematic diagram of the structure of the present invention, which includes a funnel-shaped cavity.

[0042] Figure 8 This is a schematic diagram of another embodiment of the magnetic force distribution on the surface of the magnetic roller of the present invention.

[0043] The labels in the diagram represent the following:

[0044] 1-Cavity, 11-Inlet, 12-Outlet, 13-Through hole, 14-Support platform, 15-Pulley block;

[0045] 2-Magnetic roller mechanism, 21-Magnetic roller, 22-First drive device, 23-Gear, 24-Drive motor;

[0046] 3-Scraper, 31-Force application device, 32-Hinge seat, 33-First base, 34-Second base, 35-Tension spring, 36-Hinge shaft, 37-Conductive contact piece, 38-Alarm module, 39-Conductive contact;

[0047] 4-Box body, 41-Second drive device, 42-Base plate, 43-Rectangular frame, 44-Rod body, 45-Solenoid valve, 46-Cylinder;

[0048] 5-Guide plate, 6-Cavity. Detailed Implementation

[0049] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] like Figure 1 As shown, this invention provides an iron removal system for calcined gypsum powder. A cavity 1 has an inlet 11 at its top and an outlet 12 at its bottom. A magnetic roller mechanism 2 is located inside the cavity 1, below the inlet 1. It includes at least two magnetic rollers 21, with gaps between adjacent rollers for gypsum powder to pass through. The surface of each magnetic roller 21 includes magnetic and non-magnetic surfaces, which are alternately distributed along its axis, with each magnetic and non-magnetic surface covering the same area. The magnetic roller 1 rotates in the same direction as the powder's falling direction, driven by a first driving device 22. During rotation, the magnetic surfaces of adjacent rollers 21 are staggered. A scraper 3 is located inside the cavity 1, with one scraper 3 corresponding to each magnetic roller 21, and the scraper 3 is in contact with the surface of the magnetic roller 21. A box 4 is located inside the cavity 1, with its opening covering the projected area of ​​falling iron filings, ensuring that all iron filings fall into the box. The box 4 is driven by a second driving device 41, moving between the inside and outside of the cavity 1.

[0051] Calcined gypsum powder enters the chamber through the feed inlet and passes through the gap between two magnetic rollers. Half of the roller's surface is magnetic, and the other half is non-magnetic. During rotation, the magnetic properties of the two rollers are staggered, ensuring that when the calcined gypsum passes between the rollers, one roller's surface is always magnetic and can attract iron filings. When the magnetic roller reaches the scraper position, it continues to rotate. Under the scraper's action, the iron filings slide relative to the roller until the non-magnetic part of the roller rotates to the scraper. At this point, the roller no longer attracts iron filings, and they fall into the box. Alternatively, if the roller's surface is weakly magnetic, the scraper will scrape the iron filings off the roller and into the box.

[0052] Combination Figure 1 and Figure 7 This application also provides a specific embodiment of the first driving device. The magnetic roller mechanism includes two magnetic rollers 21 that rotate in opposite directions. The magnetic rollers 21 are divided by a cross section passing through their own axis. One part of the surface is a magnetic surface and the other part is a non-magnetic surface. The magnetic rollers 21 are set in the cavity 1 by a support frame. The first driving device 22 includes two gears 23 and a drive motor 24. The two gears 23 are respectively set on the rotating shafts of the two magnetic rollers 21. The two gears 23 mesh with each other. The drive motor 24 drives one of the gears 23 to rotate.

[0053] Combination Figure 8 This application also discloses another embodiment of the magnetic distribution on the surfaces of two adjacent magnetic rollers, wherein the surfaces of the magnetic rollers are provided with three magnetic surfaces and three non-magnetic surfaces, which are alternately arranged. Compared with the above-described method, this embodiment reduces the coverage area of ​​the magnetic and non-magnetic surfaces, reduces the amount of iron filings processed by the scraper in a single pass, and slows down the wear of the scraper.

[0054] The internal structure of the cavity will be described below with reference to the accompanying drawings. Figure 6 This application provides an embodiment in which two guide plates 5 are symmetrically arranged inside the cavity 1. The two sides of the guide plates are fixed to the inner sidewall of the cavity 1. One end of the guide plate 5 contacts the inner sidewall at the feed inlet 11 of the cavity 1. The other end of the guide plate 5 is located above the magnetic roller 21 and between the vertical cross-sections of the two magnetic rollers 21. After the calcined gypsum enters the cavity, it enters between the two magnetic rollers according to a predetermined path under the action of the guide plates 5, preventing it from entering other positions in the cavity. The length of the scraper 3 is the same as the length of the magnetic roller 21, ensuring that the contact surface between the scraper and the magnetic roller completely covers the magnetic roller.

[0055] Combination Figure 7 This application also provides another embodiment in which a funnel-shaped cavity 6 can be provided in the cavity to replace the two guide plates 5. The funnel-shaped cavity 6 is a more preferred solution, which plays the same role and is suitable for situations where the gap between the magnetic roller and the inner wall of the cavity is large in the direction of its own axis.

[0056] Combination Figure 2This application provides a specific embodiment of the force-applying device. A force-applying device 31 is provided at the scraper 3, which applies an external force to the scraper to adhere to the magnetic roller 21. The force-applying device 31 includes a hinge seat 32, a first base 33, a second base 34, and a tension spring 35. The scraper 3 is disposed on the first base 33, the hinge seat 32 is disposed on the inner side wall of the cavity 1, the first base 33 is hinged to the hinge seat 32, the second base 34 is disposed on the inner side wall of the cavity 1 and is located above the first base 33, and the two ends of the tension spring 35 are respectively connected to the first base 33 and the second base 34. The tension spring applies a pulling force to the first base in the direction of the magnetic roller, thereby achieving the contact between the scraper and the magnetic roller; it also ensures that during the rotation of the magnetic roller, the scraper can prevent the iron filings from rotating with the magnetic roller, so that the iron filings slide relative to the magnetic roller and accumulate at the scraper until the non-magnetic part of the magnetic roller rotates to the scraper, the magnetic roller no longer attracts the iron filings, and the iron filings fall into the box.

[0057] Combination Figure 5 This application also provides an implementation method for alarming the wear of the scraper. The hinge shaft 36 of the hinge seat 32 is fixedly connected to the hinge seat 32, and the first base 33 is rotatably connected to the hinge shaft 36. The main body of the hinge shaft 36 is made of non-conductive material, and one end extends outward along the axial direction. A conductive contact 37 is provided on the side of the end. An alarm module 38 is provided on the side of the first base 33 near the end. The alarm module 38 is provided with a conductive contact 39. The conductive contact 39 is in contact with the side of the hinge shaft 36. When the first base 33 rotates, the conductive contact 39 makes a circular motion with the axis of the hinge shaft 36 as the center, and the conductive contact 37 is on the circumferential trajectory of the conductive contact 39. When the conductive contact 37 and the conductive contact 39 are in contact, the alarm module 38 is energized and an alarm is triggered.

[0058] As the scraper wears down, the first base will swing towards the magnetic roller under the action of the tension spring. At the same time, the conductive contact of the alarm will move around the hinge axis. Once the conductive contact and the conductive contact plate come into contact, it means that the scraper has worn down to the point where it needs to be replaced.

[0059] Combination Figure 3 and Figure 4 This application also provides a specific embodiment of the box body, wherein the box body 2 is further provided with an iron filings identification module, which controls the second driving device 41; when there are iron filings in the box body 4, the second driving device 41 moves the box body 4 to the outside of the cavity 1, and when there are no iron filings in the box body 4, the second driving device 41 moves the box body 4 to the inside of the cavity 1.

[0060] like Figure 3As shown, the side wall of the cavity 1 is provided with a through hole 13 for the box body 4 to pass through. The bottom plate 42 of the box body 4 is hinged relative to the box body 4. When the box body 4 is in contact with iron filings, the side wall of the cavity 1 at the through hole 13 provides support to the bottom plate 42, so that the bottom of the box body 4 is sealed.

[0061] The box is rectangular. The hinge position between the bottom plate and the box is on the side closer to the inside of the cavity along the box's movement path. When the box is inside the cavity receiving material, the side wall of the cavity is below the bottom plate, providing support for the bottom plate and making the bottom plate fit against the bottom edge of the box. When the box is outside the cavity dumping iron filings, the side wall of the cavity is outside the projection surface of the bottom plate, so the bottom plate will open under gravity, dumping the iron filings out of the box.

[0062] Meanwhile, in order to improve the smoothness of the box 4 passing through the through hole 13, the cavity 4 is provided with a support platform 14 at the through hole 13. The support platform 14 is provided with a pulley group 15 relative to the moving direction of the box 4. The pulley group 15 is in contact with the bottom of the base plate 42. The end of the support platform 14 is also provided with a pulley group 15. When the box 4 moves into the cavity under the action of the second drive device 41, the base plate 42 is in direct contact with the pulley group 15, so as to avoid the support platform 14 causing scratches to the base plate 42.

[0063] like Figure 4 As shown, the bottom plate 42 of the box 4 is a filter structure. Powder passes through the filter structure, while iron filings remain on it. The iron filings identification module is located on the filter structure. The filter structure includes a rectangular frame 43 and multiple sets of rods 44 arranged in parallel within the rectangular frame 43. The gap between adjacent rods is larger than the calcined gypsum powder but smaller than the iron filings, preventing the calcined gypsum powder from accumulating inside the box. Because the calcined gypsum powder is very smooth, it slides down the rods after contact, leaving only a small amount of powder on its surface. When the bottom plate is opened, it will impact the outer wall of the cavity, causing vibration. A compression spring is located at the bottom of the bottom plate near the drive device, which acts as a buffer and causes the bottom plate to perform a pendulum motion. The calcined gypsum powder covering the surface of the rods acts as a lubricant, reducing friction between the iron filings and the rods, causing the iron filings to fall off (not from the gap between adjacent magnetic rollers), preventing them from getting stuck in the gap between adjacent rods.

[0064] The second driving device 41 is a cylinder, and a bracket is provided on the side wall of the cavity, on which the cylinder is mounted. The rod 44 is made of conductive material and is part of the iron filings identification module. The iron filings identification module also includes a control circuit and a solenoid valve 45. The solenoid valve 45 is used to control the cylinder 46. The solenoid valve 45 is connected in series in the control circuit, and adjacent rods 44 are connected in parallel to the positive and negative terminals of the control circuit, respectively. When iron filings simultaneously contact adjacent rods 44, the control circuit is connected, the solenoid valve is energized, the cylinder retracts, and the box is moved to the outside of the cavity. Conversely, the solenoid valve is de-energized, the cylinder resets, and the box is moved into the cavity.

[0065] This application also provides a method for removing iron from calcined gypsum powder, which uses a calcined gypsum powder iron removal system to remove iron, including the following steps:

[0066] 1) The magnetic roller adsorbs iron filings in the powder entering the system;

[0067] 2) The scraper scrapes the iron filings off the magnetic roller. Half of the magnetic roller surface is magnetic and the other half is non-magnetic. After the magnetic roller attracts the iron filings, it rotates to the scraper position and continues to rotate. Under the action of the scraper, the iron filings slide relative to the magnetic roller and accumulate at the scraper. This continues until the non-magnetic part of the magnetic roller rotates to the scraper position, at which point the magnetic roller no longer attracts the iron filings, and the iron filings fall into the box.

[0068] 3) The iron filings identification module inside the box identifies the material inside the box; when the iron filings simultaneously contact the adjacent rods at the bottom of the box, the solenoid valve is energized, driving the cylinder to contract and moving the box to the outside of the system.

[0069] 4) The bottom plate of the box is a hinged structure, which opens under the action of gravity. When there are no iron filings in the box, the solenoid valve is de-energized, the cylinder is reset, and the box returns to directly below the scraper.

[0070] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A system for removing iron from calcined gypsum powder, characterized in that, include: The cavity (1) has an inlet (11) at the top and an outlet (12) at the bottom. A magnetic roller mechanism (2) is provided inside the cavity (1). The magnetic roller mechanism (2) includes at least two magnetic rollers (21) arranged side by side. There is a gap between any two adjacent magnetic rollers (21) for gypsum powder to pass through. Each gap is located below the feed inlet (11). The surface of the magnetic roller (21) includes magnetic and non-magnetic surfaces. Along its own axis, the magnetic and non-magnetic surfaces are alternately distributed, and the coverage area of ​​a single magnetic surface and a single non-magnetic surface is the same size. The rotation direction of the magnetic roller (21) is consistent with the powder falling direction, and it is driven to rotate by the first driving device (22); during the rotation process, the magnetic surfaces of adjacent magnetic rollers (21) are staggered. A scraper (3) is provided inside the cavity (1), and each magnetic roller (21) is provided with a corresponding scraper (3), and the scraper (3) is in contact with the surface of the magnetic roller (21); A box (4) is disposed inside the cavity (1). Each magnetic roller (21) is provided with a corresponding box (4). The opening of the box (4) covers the projection range of the falling iron filings. The box (4) is driven by the second driving device (41) and moves between the inside and outside of the cavity (1). The side wall of the cavity (1) is provided with a through hole (13) for the box (4) to pass through. The box (4) is also equipped with a scrap metal identification module, which controls the second drive device (41); When the iron filings identification module detects that there are iron filings inside the box (4), the second drive device (41) moves the box (4) to the outside of the cavity (1). When the iron filings identification module detects that there are no iron filings inside the box (4), the second drive device (41) moves the box (4) to the inside of the cavity (1). The bottom plate (42) of the box (4) is hinged relative to the box (4). When the box (4) is in contact with iron filings, the side wall of the cavity (1) at the through hole (13) provides support to the bottom plate (42), so that the bottom plate (42) and the bottom edge of the box (4) fit together. The bottom plate (42) of the box body (4) is a filter structure. Powder passes through the filter structure, and iron filings remain on the filter structure. The iron filings identification module is set on the filter structure. The filter structure includes a rectangular frame (43) and multiple sets of rods (44) arranged in parallel within the rectangular frame (43). The gap between adjacent rods is larger than the powder of calcined gypsum and smaller than the iron filings. The second drive device (41) is a cylinder; The rod (44) is made of conductive material and is part of the iron filings identification module; The iron filings identification module also includes a control circuit and a solenoid valve (45). The solenoid valve (45) is connected in series with the control circuit, and the adjacent rods (44) are connected in parallel with the positive and negative terminals of the control circuit, respectively. When the iron filings come into contact with the adjacent rods (44) at the same time, the control circuit is connected. The solenoid valve (45) is used to control the cylinder.

2. The iron removal system for calcined gypsum powder according to claim 1, characterized in that, Two magnetic rollers (21) are provided; The first driving device (22) includes two gears (23) and a driving motor (24). The two gears (23) are respectively mounted on the rotating shafts of the two magnetic rollers (21). The two gears (23) mesh with each other, and the driving motor (24) drives one of the gears (23) to rotate.

3. The iron removal system for calcined gypsum powder according to claim 1, characterized in that, The scraper (3) is provided with a force application device (31), which applies an external force to the scraper to adhere to the magnetic roller (21).

4. The iron removal system for calcined gypsum powder according to claim 3, characterized in that, The force-applying device (31) includes a hinge seat (32), a first base (33), a second base (34), and a tension spring (35). The scraper (3) is disposed on the first base (33), the hinge seat (32) is disposed on the inner wall of the cavity (1), the first base (33) is hinged to the hinge seat (32), the second base (34) is disposed on the inner wall of the cavity (1) and located above the first base (33), and the two ends of the tension spring (35) are respectively connected to the first base (33) and the second base (34).

5. A method for removing iron from calcined gypsum powder, characterized in that, Iron removal using the calcined gypsum powder iron removal system according to any one of claims 1-4 includes the following steps: 1) The magnetic roller adsorbs iron filings from the powder entering the system; 2) The scraper scrapes the iron filings off the magnetic roller. Half of the magnetic roller surface is magnetic and the other half is non-magnetic. After the magnetic roller attracts the iron filings, it rotates to the scraper position and continues to rotate. Under the action of the scraper, the iron filings slide relative to the magnetic roller and accumulate at the scraper. This continues until the non-magnetic part of the magnetic roller rotates to the scraper position, at which point the magnetic roller no longer attracts the iron filings, and the iron filings fall into the box. 3) The iron filings identification module inside the box identifies the material inside the box; when the iron filings simultaneously contact the adjacent rods at the bottom of the box, the solenoid valve is energized, driving the cylinder to contract and moving the box to the outside of the system. 4) The bottom of the box is a hinged structure, which opens under the action of gravity. When there are no iron filings inside the box, the solenoid valve is de-energized, the cylinder is reset, and the box returns to the system. 5) Repeat the above steps.

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