Iron impurity removing device for alumina powder production

Abstract

The utility model discloses an iron impurity removing device for alumina powder production. The iron impurity removing device comprises a shell, a stock bin is formed in the shell, a feeding port communicated with the stock bin is formed in the top of the shell, and a discharging port communicated with the stock bin is formed in the bottom of the shell; the adsorption mechanism is arranged in the stock bin and connected with the shell, the adsorption mechanism comprises a flat annular adsorption net, the flat annular adsorption net rotates in a reciprocating mode in the horizontal direction of the stock bin, and the flat annular adsorption net comprises two horizontal adsorption parts which are arranged in the height direction in a spaced mode; the horizontal adsorption part is used for adsorbing iron impurities in alumina powder; the adsorption mechanism is arranged in the material bin, the removal mechanism is arranged in the material bin and located on the side portion of the adsorption mechanism, and the removal mechanism is used for adsorbing iron impurities on the flat annular adsorption net and discharging the iron impurities out of the material bin.

Description

Technical Field

[0001] This application relates to the field of alumina powder production technology, and in particular to an iron impurity removal device for alumina powder production. Background Technology

[0002] Due to factors such as the production process, the presence of iron in raw materials, and friction between the alumina powder and equipment during transportation and chute conveying, the iron content in alumina powder is relatively high. When iron-containing materials are added to the electrolytic cell, the iron content in the cell increases, which has a significant impact on the control of the electrolytic process, the judgment of process parameters, and the quality of primary aluminum. Currently, there is a lack of effective devices to remove iron impurities from alumina powder. Utility Model Content

[0003] This application provides an iron impurity removal device for alumina powder production, which solves the problem of excessive iron impurities in existing alumina powder during the production process.

[0004] This application provides an iron impurity removal device for alumina powder production, comprising a housing with a hopper inside, an inlet at the top of the housing communicating with the hopper, and an outlet at the bottom communicating with the hopper; an adsorption mechanism disposed within the hopper and connected to the housing, the adsorption mechanism comprising a flat annular adsorption net that reciprocates in the horizontal direction of the hopper, the flat annular adsorption net comprising two horizontal adsorption sections spaced apart in the vertical direction, the horizontal adsorption sections being used to adsorb iron impurities in the alumina powder; and a removal mechanism disposed within the hopper and located on the side of the adsorption mechanism, the removal mechanism being used to adsorb iron impurities on the flat annular adsorption net and discharge them outside the hopper.

[0005] In one possible implementation, the adsorption mechanism further includes two horizontal plates, each with a rotating rod rotatably mounted at both ends. Two pulleys are fixed on each of the two rotating rods, and the two pulleys on the same side of the two rotating rods are connected by belt drive. The two sides of the flat annular adsorption net are respectively fixed to the two belts, and a first motor that drives the corresponding rotating rod to rotate is fixed on the outer side of one of the horizontal plates.

[0006] In one possible implementation, the flat annular adsorption net includes two flexible ring belts, which are respectively fixed to two belts. A plurality of evenly distributed fine magnetic rods are fixed between the two flexible ring belts, and adjacent fine magnetic rods are connected by a plurality of evenly distributed connecting strips.

[0007] In one possible implementation, the cleaning mechanism includes a rotating drum rotatably mounted on two horizontal plates, with the rotating drum corresponding to the end of the flat annular adsorption net. An external gear ring is fixed to the end of the rotating drum, and a gear is fixed to the end of the rotating rod near the rotating drum, with the gear meshing with the external gear ring.

[0008] The rotating drum is equipped with a magnetic suction device, which is fixed to two horizontal plates by a mounting bracket. The vertical cross-section of the magnetic suction device is an arc-shaped structure. The magnetic suction device forms a magnetic field area on the outer surface of the rotating drum, while the other areas of the rotating drum are non-magnetic field areas. The magnetic field area will attract iron impurities on the flat annular adsorption net to the outer surface of the rotating drum. When the iron impurities rotate to the non-magnetic field area, the iron impurities will fall off the outer surface of the rotating drum.

[0009] In one possible implementation, there are two cleaning mechanisms, which are located on opposite sides of the flat annular adsorption net. The magnetic field area on the side of the upper horizontal adsorption part in the direction of rotation corresponds to the end of the flat annular adsorption net, and the central angle of the magnetic field area is 70-90°. The starting end of the magnetic field area on the side of the lower horizontal adsorption part in the direction of rotation corresponds to the lower side of the flat annular adsorption net and extends from top to the other side, and the central angle of the magnetic field area is 200-270°.

[0010] In one possible implementation, the magnetic attractor is an electromagnet or a magnet.

[0011] In one possible implementation, the cleaning mechanism further includes a scraper disposed on the underside of the rotating drum. The scraper includes a scraper blade rotatably mounted between two horizontal plates via a rotating shaft. The scraper blade has a scraping portion on the side away from the rotating shaft. A torsion spring is sleeved on the rotating shaft to drive the scraper blade to rotate upward, so as to scrape off iron impurities from the outer surface of the rotating drum through the scraping portion.

[0012] In one possible implementation, the housing includes a discharge hopper and an iron and impurity discharge hopper;

[0013] The discharge hopper is equipped with the hopper and the discharge port;

[0014] The iron and impurity discharge hopper is connected to the discharge hopper, with one end extending into the hopper and below the cleaning mechanism, and the other end extending to the outside of the hopper. A chip removal channel is formed between the iron and impurity discharge hopper and the discharge hopper.

[0015] In one possible implementation, the vibration mechanism is further included. The vibration mechanism is used to swing the adsorption mechanism and the removal mechanism simultaneously to avoid the accumulation of alumina powder on the flat annular adsorption net. The vibration mechanism includes multiple optical axes fixed on both sides of the adsorption mechanism, and the optical axes are slidably connected to the side wall of the housing. A spring is sleeved on one side of the optical axis of the adsorption mechanism, and a driving member is provided on the other side of the adsorption mechanism to drive the adsorption mechanism to slide along the optical axis axial direction.

[0016] In one possible implementation, the driving component includes a second motor fixed to the inner wall of the housing via a mounting plate, an eccentric wheel fixed to the output end of the second motor, and the outer wall of the eccentric wheel contacting the side wall of the adsorption mechanism.

[0017] The iron impurity removal device for alumina powder production based on the embodiments of this application involves alumina powder entering the silo through the inlet and exiting through the outlet. During the transportation of alumina, the flat annular adsorption mesh efficiently adsorbs and filters iron impurities in the alumina powder, ensuring the purity and quality of the product. The flat annular adsorption mesh has two horizontal adsorption sections spaced apart in the height direction, allowing the alumina powder to undergo two adsorption and filtration processes within the device, effectively improving the iron removal effect and guaranteeing product quality. The removal mechanism adsorbs the iron impurities on the flat annular adsorption mesh and discharges them out of the silo, achieving automatic removal of iron impurities, reducing manual intervention, and improving production efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or 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 only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 A schematic diagram of an iron impurity removal device for alumina powder production provided in this application embodiment;

[0020] Figure 2 This is a cross-sectional structural schematic diagram of an iron impurity removal device for alumina powder production provided in an embodiment of this application;

[0021] Figure 3 A schematic diagram of the adsorption mechanism from a first-view perspective is provided for embodiments of this application;

[0022] Figure 4 for Figure 3 Enlarged structural diagram at point A;

[0023] Figure 5This is a schematic diagram of the adsorption mechanism provided in the embodiments of this application from a second perspective.

[0024] Figure 6 for Figure 3 Enlarged structural diagram at point B;

[0025] Figure 7 This is a schematic diagram of the main structure of the adsorption mechanism and the removal mechanism.

[0026] Explanation of icon numbers:

[0027] 1. Shell; 11. Feed hopper; 12. Support leg; 13. Iron and impurity discharge hopper; 14. Discharge hopper; 2. Adsorption mechanism; 21. Horizontal plate; 22. Flat annular adsorption net; 221. Flexible ring belt; 222. Fine magnetic rod; 223. Connecting bar; 23. First motor; 24. Rotating rod; 25. Pulley; 26. Belt; 3. Cleaning mechanism; 31. Rotary drum; 32. Mounting frame; 33. Magnetic suction component; 34. External gear ring; 35. Gear; 36. Scraper; 361. Scraper blade; 362. Torsion spring; 4. Vibration mechanism; 41. Second motor; 42. Eccentric wheel; 43. Optical shaft; 44. Spring.

[0028] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0030] Where the following description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0031] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] Please see Figures 1 to 5 This application provides an iron impurity removal device for alumina powder production, comprising a housing 1, an adsorption mechanism 2, and a removal mechanism 3.

[0034] The shell 1 contains a hopper, with an inlet at the top and an outlet at the bottom. In some configurations, the shell 1 includes a feed hopper 11 and a discharge hopper 14 connected together, with the feed hopper 11 positioned above and at the center of the discharge hopper 14. The feed hopper 11 has an inlet, and the discharge hopper 14 has a hopper and an outlet. The feed hopper 11 and the discharge hopper 14 can be integrally formed or separate components. When the feed hopper 11 and the discharge hopper 14 are configured as separate components, they can be fixed together by methods including, but not limited to, screwing, snap-fitting, and welding.

[0035] The adsorption mechanism 2 is installed inside the hopper and includes two horizontal plates 21 and a flat annular adsorption net 22 that reciprocates in the horizontal direction of the hopper. The horizontal plates 21 are fixedly connected to the housing 1 so that the adsorption mechanism 2 can be fixed inside the hopper. The connection methods between the horizontal plates 21 and the housing 1 include, but are not limited to, screwing, snap-fitting, welding, etc. The flat annular adsorption net 22 is a closed-loop structure, having two horizontal adsorption sections spaced apart in the height direction, with the two ends of the two horizontal adsorption sections connected by arc-shaped sections. Rotating rods 24 are rotatably mounted at both ends of the two horizontal plates 21, and two pulleys 25 are fixed to each of the two rotating rods 24. The two pulleys 25 on the same side of the two rotating rods 24 are connected by belts 26. The two side edges of the flat annular adsorption net 22 are fixed to the two belts 26, and a first motor 23 driving the corresponding rotating rod 24 is fixed to the outer side of one of the horizontal plates 21.

[0036] In other embodiments, the pulley 25 and belt 26 may also be replaced by a sprocket and a chain.

[0037] The first motor 23 drives the corresponding rotating rod 24 to rotate, and at the same time, the pulley 25 and belt 26 drive another rotating rod 24 to rotate. At this time, the flat ring adsorption net 22 will also rotate back and forth with the belt 26. When alumina powder is put into the feed hopper 11, it passes through the two horizontal adsorption sections of the flat ring adsorption net 22 in sequence. During this process, iron impurities in the alumina powder will be adsorbed onto the flat ring adsorption net 22. Due to the two upper and lower horizontal adsorption sections, the alumina powder can achieve two adsorption and filtration during the falling process, ensuring the effect of removing iron impurities.

[0038] Furthermore, the flat annular adsorption net 22 includes two flexible ring belts 221, and the two flexible ring belts 221 are respectively fixed to two belts 26. That is, when the belts 26 rotate, the flat annular adsorption net 22 can rotate synchronously with the belts 26. A plurality of evenly distributed fine magnetic rods 222 are fixed between the two flexible ring belts 221. The fine magnetic rods 222 are strip-shaped or cylindrical, preferably cylindrical. When the cleaning mechanism 3 adsorbs iron impurities on the fine magnetic rods 222, the cylindrical structure of the fine magnetic rods 222 makes it easier for iron impurities to be adsorbed. Adjacent fine magnetic rods 222 are connected by a plurality of evenly distributed connecting strips 223. The connecting strips 223 can be bent and can be smoothly transported when passing through the arc section of the flat annular adsorption net 22.

[0039] The cleaning mechanism 3 is located on the side of the adsorption mechanism 2. In this embodiment, it is connected to two horizontal plates 21. It is used to adsorb iron impurities on the flat annular adsorption net 22. The magnetic force of the cleaning mechanism 3 is greater than that of the fine magnetic rod 222. It can adsorb iron impurities on the fine magnetic rod 222 to the cleaning mechanism 3 and discharge them from the shell 1 through the iron impurity discharge hopper 13.

[0040] Based on the embodiment of this application, the alumina powder production iron removal device involves alumina powder entering the silo through the inlet and exiting through the outlet. During alumina transportation, the flat annular adsorption mesh 22 efficiently adsorbs and filters iron impurities in the alumina powder, ensuring product purity and quality. The flat annular adsorption mesh 22 has two horizontal adsorption sections spaced apart in the height direction, allowing the alumina powder to undergo two adsorption and filtration processes within the device, effectively improving iron removal and guaranteeing product quality. The removal mechanism 3 adsorbs and discharges the iron impurities from the flat annular adsorption mesh 22 out of the silo, achieving automatic removal of iron impurities, reducing manual intervention, and improving production efficiency.

[0041] To facilitate the collection of processed alumina powder, those skilled in the art can place a storage device below the discharge port or lay a conveyor line below the discharge port. The conveyor line transports the processed alumina powder to the next process, facilitating its further production.

[0042] To facilitate the collection and removal of iron impurities from the adsorption mechanism 2 by the cleaning mechanism 3, the housing 1 also includes an iron impurity discharge hopper 13. The iron impurity discharge hopper 13 is connected to the discharge hopper 14, with one end extending into the hopper and below the cleaning mechanism 3, and the other end extending outside the hopper. The iron impurity discharge hopper 13 is inclined downwards from inside the hopper towards the outside. The side wall of the discharge hopper 14 has a chip discharge through-hole communicating with the hopper, and the iron impurity discharge hopper 13 is located within this through-hole. Thus, a chip discharge channel is formed between the iron impurity discharge hopper 13 and the discharge hopper 14, allowing the iron impurities removed from the adsorption mechanism 2 by the cleaning mechanism 3 to be discharged through the chip discharge channel.

[0043] Furthermore, the aforementioned horizontal plate 21 can be attached to the top of the iron removal hopper 13, thereby allowing the adsorption mechanism 2 to be installed inside the hopper, facilitating the installation and maintenance of the iron removal device for alumina powder production.

[0044] Furthermore, the housing 1 is fixed with multiple support legs 12. It is understood that by designing the height of the support legs 12, the height of the discharge port can be flexibly adjusted according to the height requirements of different storage devices or production lines, ensuring that materials are smoothly discharged from the housing and smoothly transferred to the next process. Moreover, by adjusting the height of the discharge port, space can be effectively utilized, making the entire production line layout more rational, saving production space, and facilitating operation and maintenance.

[0045] like Figure 3 , Figure 5 , Figure 6 and Figure 7 As shown, in this embodiment, the cleaning mechanism 3 includes a rotating cylinder 31 rotatably mounted on two horizontal plates 21, and the end of the rotating cylinder 31 corresponds to the end of the flat annular adsorption net 22. That is, the rotating cylinder 31 is horizontally corresponding to the adsorption mechanism 2. The thickness of the rotating cylinder 31 between the two horizontal plates 21 is 0.5-1mm. An external gear ring 34 is fixed to the end of the rotating cylinder 31, and a gear 35 is fixed to the end of the rotating rod 24 near the rotating cylinder 31. The gear 35 is meshed with the external gear ring 34. When the adsorption mechanism 2 is running, the rotating cylinder 31 can be driven to rotate through the cooperation of the gear 35 and the external gear ring 34.

[0046] A magnetic suction element 33 is installed inside the rotating drum 31, and the magnetic suction element 33 is fixed to two horizontal plates 21 by the mounting bracket 32. The vertical cross section of the magnetic suction element 33 is an arc-shaped structure, and the magnetic suction element 33 is close to the inner surface of the rotating drum 31. The magnetic field of the magnetic suction element 33 will pass through the rotating drum 31 and form a magnetic field area on the outer surface of the rotating drum 31. The other areas of the rotating drum 31 are non-magnetic field areas, and the magnetic field area corresponds to the arc-shaped section of the flat annular adsorption net 22. Under the action of the magnetic field of the magnetic suction element 33, iron impurities will be adsorbed on the outer surface of the rotating drum 31. The iron impurities will not fall off by themselves in the magnetic field area. When the iron impurities rotate with the rotating drum 31 to the non-magnetic field area, they lose the binding of the magnetic field of the magnetic suction element 33, and the iron impurities fall off the outer surface of the rotating drum 31 and fall onto the iron impurity discharge hopper 13 for discharge.

[0047] Furthermore, there are two cleaning mechanisms 3, and the two cleaning mechanisms 3 are located on both sides of the flat annular adsorption net 22, which increases the adsorption effect on iron impurities on the flat annular adsorption net 22.

[0048] The magnetic field zone on the side of the upper horizontal adsorption part in the direction of rotation corresponds to the end of the flat ring adsorption net 22. The central angle of this magnetic field zone is 70-90°. That is, the starting end of the magnetic adsorption element 33 at this point corresponds to the horizontal position of the upper horizontal adsorption part, and the ending end corresponds to the horizontal position of the lower horizontal adsorption part. As the rotating drum 31 rotates, when the iron impurities are displaced to the bottom of the rotating drum 31, they have broken away from the magnetic field of the magnetic adsorption element 33 and are located in the non-magnetic field zone. At this time, the iron impurities on the outer surface of the rotating drum 31 will detach on their own and fall downwards.

[0049] The starting end of the magnetic field zone on the side of the lower horizontal adsorption part in the direction of rotation corresponds to the lower side of the flat ring adsorption net 22 (i.e., the horizontal adsorption part of the lower flat ring adsorption net 22), which extends from top to the other side. The central angle of this magnetic field zone is 200-270°. As the rotating drum 31 rotates, the iron impurities will flip from side to side and eventually flip to the bottom of the rotating drum 31, where they have been removed from the magnetic field of the magnetic attractor 33 and are located in the non-magnetic field zone. At this time, the iron impurities on the outer surface of the rotating drum 31 will detach on their own and fall downwards.

[0050] Furthermore, the magnetic component 33 is an electromagnet or a magnet. The electromagnet can adjust the magnitude of the magnetic force as needed for better results.

[0051] like Figure 3 and Figure 6As shown, in this embodiment, the cleaning mechanism 3 also includes a scraper 36, which is disposed on the lower side of the rotating drum 31. It includes a scraper 361 that is rotatably mounted between two horizontal plates 21 via a rotating shaft. The scraper 361 has a scraping blade portion on the side away from the rotating shaft, which is thinner. A torsion spring 362 is sleeved on the rotating shaft to drive the scraper 361 to rotate upward, so that the scraping blade portion is in contact with the surface of the rotating drum 31, so as to scrape off the iron impurities on the outer surface of the rotating drum 31 through the scraping blade portion, thereby ensuring that the iron impurities on the rotating drum 31 are cleaned.

[0052] like Figure 3 and Figure 5 As shown, if the amount of alumina powder falling onto the flat annular adsorption net 22 is too large, the alumina powder is prone to accumulate on the flat annular adsorption net 22. In this embodiment, a vibration mechanism 4 is added. The vibration mechanism 4 is used to swing the adsorption mechanism 2 and the cleaning mechanism 3 at the same time to avoid the accumulation of alumina powder on the flat annular adsorption net 22, thus ensuring the effect and improving the efficiency.

[0053] The vibration mechanism 4 includes multiple optical shafts 43 fixed to the outside of the two horizontal plates 21 of the adsorption mechanism 2. The optical shafts 43 are slidably connected to the side wall of the housing 1 through linear bearings. A spring 44 is sleeved on the optical shaft 43 on one side of the adsorption mechanism 2. A driving member is provided on the other side of the adsorption mechanism 2. When the driving member pushes the adsorption mechanism 2 to move towards the side of the spring 44, it will compress the spring 44 to store force. When the spring 44 does not push, the adsorption mechanism 2 will be pushed towards the side of the driving member due to the force of the spring 44, so as to realize the reciprocating movement of the adsorption mechanism 2. The stroke range of this movement is 1-3mm.

[0054] Furthermore, the driving component includes a second motor 41 fixed to the inner wall of the housing 1 via a mounting plate. An eccentric wheel 42 is fixed to the output end of the second motor 41, and the outer side wall of the eccentric wheel 42 contacts the side wall of the adsorption mechanism 2. When the eccentric wheel 42 is driven to rotate one revolution by the second motor 41, the first half revolution can push the adsorption mechanism 2 toward one side of the spring 44.

[0055] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0056] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A device for removing iron impurities in alumina powder production, characterized in that, include: The shell has a material hopper inside, and the top of the shell has a material inlet that communicates with the material hopper, and the bottom of the shell has a material outlet that communicates with the material hopper. An adsorption mechanism, disposed within the hopper and connected to the housing, includes a flat annular adsorption mesh that reciprocates horizontally within the hopper. The mesh includes two horizontal adsorption sections spaced apart vertically, each section used to adsorb iron impurities from the alumina powder. A cleaning mechanism is installed inside the hopper and located on the side of the adsorption mechanism. The cleaning mechanism is used to adsorb iron impurities on the flat annular adsorption net and discharge them outside the hopper.

2. The apparatus for removing iron impurities from alumina powder production according to claim 1, wherein The adsorption mechanism also includes two horizontal plates, each with a rotating rod rotatably mounted at both ends. Each rotating rod has two pulleys fixed on it, and the two pulleys on the same side of the two rotating rods are connected by belt drive. The two sides of the flat annular adsorption net are respectively fixed to the two belts, and a first motor that drives the corresponding rotating rod to rotate is fixed on the outer side of one of the horizontal plates.

3. The apparatus for removing iron impurities from alumina powder production according to claim 2, wherein The flat annular adsorption net includes two flexible ring belts, which are respectively fixed to two belts. A plurality of evenly distributed fine magnetic rods are fixed between the two flexible ring belts, and adjacent fine magnetic rods are connected by a plurality of evenly distributed connecting strips.

4. The apparatus for removing iron impurities from alumina powder production according to claim 2, wherein The cleaning mechanism includes a rotating drum rotatably mounted on two horizontal plates, with the end of the rotating drum corresponding to the end of the flat annular adsorption net. An external gear ring is fixed to the end of the rotating drum, and a gear is fixed to the end of the rotating rod near the rotating drum, with the gear meshing with the external gear ring. The rotating drum is equipped with a magnetic suction device, which is fixed to two horizontal plates by a mounting bracket. The vertical cross-section of the magnetic suction device is an arc-shaped structure. The magnetic suction device forms a magnetic field area on the outer surface of the rotating drum, while the other areas of the rotating drum are non-magnetic field areas. The magnetic field area will attract iron impurities on the flat annular adsorption net to the outer surface of the rotating drum. When the iron impurities rotate to the non-magnetic field area, the iron impurities will fall off the outer surface of the rotating drum.

5. The apparatus for removing iron impurities from alumina powder production according to claim 4, wherein The number of cleaning mechanisms is two, and the two cleaning mechanisms are respectively located on both sides of the flat annular adsorption net. The magnetic field area on the side of the upper horizontal adsorption part in the direction of rotation corresponds to the end of the flat annular adsorption net, and the central angle of the magnetic field area is 70-90°. The starting end of the magnetic field area on the side of the lower horizontal adsorption part in the direction of rotation corresponds to the lower side of the flat annular adsorption net, and it extends from the top to the other side, and the central angle of the magnetic field area is 200-270°.

6. The iron impurity removal device for alumina powder production as described in claim 4 or 5, characterized in that, The magnetic attractor is an electromagnet or a magnet.

7. The iron impurity removal device for alumina powder production as described in claim 4 or 5, characterized in that, The cleaning mechanism also includes a scraper, which is located directly below the rotating drum. The scraper includes a scraper that is rotatably mounted between two horizontal plates via a rotating shaft. The scraper has a scraping blade on the side away from the rotating shaft. A torsion spring is sleeved on the rotating shaft to drive the scraper to rotate upward, so as to scrape off iron impurities from the outer surface of the rotating drum through the scraping blade.

8. The iron impurity removal device for alumina powder production as described in any one of claims 1 to 4, characterized in that, The shell includes a discharge hopper and an iron and impurity discharge hopper; The discharge hopper is equipped with the hopper and the discharge port; The iron and impurity discharge hopper is connected to the discharge hopper, with one end extending into the hopper and located below the cleaning mechanism, and the other end extending to the outside of the hopper. A chip removal channel is formed between the iron and impurity discharge hopper and the discharge hopper.

9. The iron impurity removal device for alumina powder production as described in any one of claims 1 to 4, characterized in that, It also includes a vibration mechanism, which is used to swing the adsorption mechanism and the removal mechanism simultaneously to avoid the accumulation of alumina powder on the flat ring adsorption net; the vibration mechanism includes multiple optical axes fixed on both sides of the adsorption mechanism, and the optical axes are slidably connected to the side wall of the housing. A spring is sleeved on one side of the optical axis of the adsorption mechanism, and a driving component is provided on the other side of the adsorption mechanism to drive the adsorption mechanism to slide along the optical axis axial direction.

10. The iron impurity removal device for alumina powder production as described in claim 9, characterized in that, The driving component includes a second motor fixed to the inner wall of the housing via a mounting plate. An eccentric wheel is fixed to the output end of the second motor, and the outer wall of the eccentric wheel is in contact with the side wall of the adsorption mechanism.

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