Iron removal system for a steel slag vertical mill

Abstract

The present application relates to the technical field of steel slag treatment, and specifically discloses a steel slag vertical mill bed material deironing system, which comprises a vertical mill shell and a grinding disc device arranged in the vertical mill shell, a bed material rolling and loosening device is arranged above the grinding disc device, the bed material rolling and loosening device is fixed on the vertical mill shell, the bed material rolling and loosening device adopts a lifting type roller, the roller is used for planing and loosening the compacted bed material on the grinding disc body of the grinding disc device, the roller is in contact with the bed material after descending, the grinding disc body rotates, and the roller planes and loosens the bed material. The present application can periodically treat the grinding disc feeding bed, effectively remove the metallic iron in the steel slag, reduce the wear of the grinding disc and the grinding roller, improve the quality of the steel slag micro-powder, and ensure the efficient and stable operation of the steel slag vertical mill.

Description

Technical Field

[0001] This invention relates to the field of steel slag treatment technology, and in particular to a steel slag vertical mill material iron removal system. Background Technology

[0002] Steel slag is a byproduct of steel production, and its output has been increasing with the development of the steel industry. Steel slag contains a certain amount of metallic iron, approximately 4% to 8%. If this iron is not effectively removed, it will have many adverse effects on subsequent grinding and applications. First, because the residual iron in the steel slag is heavier than the slag itself, after a period of rolling, iron powder settles at the bottom of the material bed on the grinding disc surface. Over time, the proportion of iron powder increases significantly. Under these operating conditions, the wear on the grinding disc is severe, and the grinding efficiency is significantly reduced. In existing vertical mill grinding processes for steel slag, the presence of metallic iron easily leads to accelerated wear on the grinding disc and rollers, reducing the service life of the equipment and increasing maintenance costs. Second, the enrichment of metallic iron also affects the quality of the steel slag powder, reducing its performance in applications such as cement and concrete.

[0003] Furthermore, current iron removal methods simply involve adding suspended iron separators, permanent magnet drum iron separators, or pipeline iron separators to the outlet or inlet of the vertical mill. Most of these methods employ simple non-contact magnetic direct attraction structures. This results in incomplete iron removal, complex equipment structures, high operating costs, and reduced operating efficiency of the steel slag vertical mill. Inappropriate installation locations of some iron removal devices also interfere with the airflow and material flow within the vertical mill, leading to decreased grinding efficiency. Summary of the Invention

[0004] The present invention aims to solve the above-mentioned problems. To this end, the present invention provides a steel slag vertical mill bed material iron removal system, which can periodically treat the material bed on the mill disc, effectively remove metallic iron from the steel slag, reduce the wear of the mill disc and mill rollers, improve the quality of steel slag powder, and at the same time ensure the efficient and stable operation of the steel slag vertical mill.

[0005] This invention provides a steel slag vertical mill bed material iron removal system, the technical solution of which is as follows: It includes a vertical mill shell and a grinding disc device disposed inside the vertical mill shell. A bed material rolling and loosening device is installed above the grinding disc assembly. The bed material rolling and loosening device is fixed to the outer shell of the vertical mill. The bed material rolling and loosening device adopts a lifting roller, which is used to loosen and disperse the compacted bed material on the grinding disc body of the grinding disc assembly. After the roller descends, it comes into contact with the bed material, the grinding disc rotates, and the roller loosens and breaks up the bed material.

[0006] Furthermore, the bed material rolling and loosening device includes a mounting plate, a hydraulic cylinder mounting plate, a hydraulic cylinder A, a guide column, a roller bracket, and a roller. The mounting plate is fixed to the inner wall of the vertical mill housing, and the hydraulic cylinder mounting plate is fixed to the mounting plate. The hydraulic cylinder A and the guide column are mounted on the hydraulic cylinder mounting plate. Both the hydraulic cylinder A and the guide column are connected to the roller bracket. The roller is mounted on the roller bracket. When the piston rod of the hydraulic cylinder A extends or retracts, it drives the roller to move up and down.

[0007] Furthermore, the roller is a conical, toothed roller.

[0008] Furthermore, a bed material removal and unloading device is provided behind the bed material rolling and loosening device. The bed material removal and unloading device is fixed on the inner wall of the vertical mill shell. The bed material removal and unloading device includes a lifting and unloading blade, which is used to throw the loosened and dispersed bed material towards the edge of the mill disc.

[0009] Furthermore, the material removal and unloading device includes an arm end mounting plate, a hydraulic cylinder support plate, a hydraulic cylinder B, and a material lifting and unloading knife. The arm end mounting plate is fixed to the inner wall of the vertical mill shell, and the hydraulic cylinder support plate is fixed to the arm end mounting plate. The hydraulic cylinder support plate is equipped with a hydraulic cylinder B and a guide column. Both the hydraulic cylinder B and the guide column are connected to the material lifting and unloading knife. When the piston rod of the hydraulic cylinder B extends or retracts, it drives the material lifting and unloading knife to move up and down.

[0010] Furthermore, a grinding disc anvil is provided on the grinding disc body. The grinding disc anvil is located below the roller. An edge pressure plate presses on the edge of the grinding disc anvil and is connected to the grinding disc body. The bed material retaining ring is annular, and its inner wall is close to the edge pressure plate. The bed material retaining ring is connected to the lifting mechanism.

[0011] Furthermore, the lifting mechanism includes a mounting bracket, a T-shaped plate, a cylinder support plate, a cylinder, and support rollers. The mounting bracket is fixed to the inner wall of the vertical mill housing and connected to the cylinder support plate. The cylinder is fixed to the cylinder support plate, and its piston rod is connected to the T-shaped plate. Support rollers are provided on the T-shaped plate, and the support rollers are connected to the bed material retaining ring.

[0012] Furthermore, an outer guide plate is provided on the T-shaped plate, and the outer guide plate is close to the bed material retaining ring.

[0013] Furthermore, the dual-belt iron removal device is connected to the vertical mill shell. The dual-belt iron removal device includes a feed pipe, a distribution box, magnetic double pulleys, a slag discharge conveyor belt, and an iron removal conveyor belt. The material distribution box is equipped with a feeding pipe. Inside the material distribution box, there is a slag discharge conveyor belt, an iron removal conveyor belt, and two longitudinally arranged magnetic double pulleys. A material distribution channel is formed between the two magnetic double pulleys. The slag discharge conveyor belt is located below the material distribution channel. An iron discharge channel is located between the outer side of the magnetic double pulleys and the iron removal conveyor belt. After the bed material passes through the feed pipe, it falls along the distribution channel. The slag powder in the bed material falls onto the slag discharge conveyor belt, and the iron powder in the bed material is adsorbed onto the surface of the belt and moves to the outside of the magnetic double pulley under the drive of the belt, falls into the iron discharge channel, and then falls onto the iron removal conveyor belt.

[0014] Furthermore, a feeding wheel is provided inside the material distribution channel, which is used to break up the bed material.

[0015] The above-described one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: 1. This invention pioneers a timed bed material removal and iron removal integrated system, opening up a new path for steel slag iron removal technology. This invention initiates the bed material removal process at set times, rather than relying on passive iron removal during conventional grinding processes. This process adjusts the bed material retention space through a bed material retainer lifting mechanism, a bed material rolling and loosening device to disperse and compact the bed material, and a bed material removal and unloading device to guide the bed material to the edge. Finally, it connects to a dual-belt iron removal device to complete precise iron removal, forming a continuous closed loop of loosening-unloading-iron removal.

[0016] 2. This invention replaces the existing fixed bed material retaining ring with a sliding retaining ring, and matches it with a dedicated lifting mechanism, providing core support for timed iron removal of the bed material. When the bed material removal process is started, the piston rod of the hydraulic cylinder moves down, and the bed material retaining ring can be precisely lowered to be flush with the upper surface of the grinding disc anvil. At this time, the bed material is no longer blocked by the fixed retaining ring and can be smoothly thrown to the edge of the grinding disc by the lifting and discharge blades, and enter the double-belt iron removal device along the guide plate. This sliding design breaks the limitation of the fixed retaining ring on the flow of bed material, making it possible to deliver the bed material to the iron removal stage at regular intervals, which is the core structural guarantee for the continuous operation of the entire iron removal system.

[0017] 3. The bed material rolling and loosening device of the present invention adopts a conical wolf-tooth roller body, which combines the advantages of high-efficiency loosening and energy saving. Addressing the problem that the bed material on the grinding disc is easily compacted by the grinding rollers and difficult to separate for iron removal, the bed material rolling and loosening device of the present invention uses a conical wolf-tooth roller body. The nipple-shaped rods roll and apply force in a digging manner, which can quickly break up the compacted bed material into a loose state, significantly reducing the problem of iron powder leakage caused by material agglomeration during subsequent iron removal. More importantly, this device does not require an additional drive motor, but utilizes the rotational friction of the grinding disc itself, eliminating the need for a dedicated power source.

[0018] 4. The support roller design of the retaining ring lifting mechanism of the present invention combines lifting and following functions, with ingenious structure and strong practicality. The core innovation of the retaining ring lifting mechanism lies in the multi-functional design of the support roller: on the one hand, it can provide a stable vertical lifting force for the bed material retaining ring; on the other hand, it does not affect the bed material retaining ring rotating together with the grinding disc body, which reduces component wear and ensures the uniformity of bed material accumulation inside the retaining ring, laying the foundation for the stable implementation of subsequent loosening and unloading processes.

[0019] 5. The dual-belt iron removal device of this invention innovatively adopts a contact-type iron suction, significantly improving the efficiency and accuracy of iron removal. After the bed material enters the distribution box through the feeding pipe, it falls along the distribution channel between the two pulleys. The high-speed rotation of the discharge wheel throws and scatters the material, increasing the contact area between the material and the two magnetic pulleys. Iron powder in the bed material is directly adsorbed onto the belt surface during the contact process, rather than being adsorbed in the air, avoiding insufficient adsorption force due to distance. Slag powder without iron powder falls naturally to the slag discharge conveyor belt. This contact design combined with the discharge structure significantly improves the efficiency and accuracy of iron removal compared to traditional non-contact methods, effectively reducing iron powder leakage.

[0020] 6. This invention significantly reduces the metallic iron content of the mill-exit steel slag powder, thereby reducing equipment wear and maintenance costs. This system can stably control the metallic iron content of the mill-exit steel slag powder to below 0.3%. With the reduced metallic iron content, the grinding rollers do not need to overcome the hard resistance of metallic iron during pressure application, significantly reducing abnormal wear between the grinding rollers and liners, greatly extending their service life, and also reducing downtime maintenance time costs. Long-term operation can significantly reduce the company's equipment maintenance expenses.

[0021] 7. This invention, through efficient iron removal, ensures that the material entering the grinding stage is primarily slag powder, significantly improving the uniformity of the material layer. The vertical pressure and shear force of the grinding rollers can act more efficiently on the material, eliminating the need for additional power to overcome the resistance of metallic iron, thereby achieving a 3-5% reduction in grinding power consumption. This reduction in power consumption directly lowers the company's production costs, and combined with the decrease in equipment maintenance costs, significantly improves the company's overall economic benefits.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in this invention 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 some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1This is a three-dimensional schematic diagram provided by the present invention.

[0025] Figure 2 This is a schematic diagram of the lower part of the structure provided by the present invention.

[0026] Figure 3 This is a schematic diagram of the structure of the bed material rolling and fluffing device provided by the present invention.

[0027] Figure 4 This is a schematic diagram of the bed material removal and unloading device provided by the present invention.

[0028] Figure 5 This is a top view schematic diagram of the grinding disc device provided by the present invention.

[0029] Figure 6 This is a structural schematic diagram of the lifting mechanism provided by the present invention.

[0030] Figure 7 This is a schematic diagram of the distribution of the lifting mechanism provided by the present invention.

[0031] Figure 8 This is a schematic diagram of the structure of the dual-belt iron removal device provided by the present invention.

[0032] Figure 9 This is a cross-sectional schematic diagram of the dual-belt iron removal device provided by the present invention.

[0033] Figure label: 1. Vertical mill outer shell; 2. Grinding disc assembly; 3. Bed material rolling and loosening device; 4. Bed material removal and unloading device; 5. Lifting mechanism; 6. Double belt iron removal device; 7. Grinding roller; 21. Grinding disc body; 22. Grinding disc anvil; 23. Edge pressure plate; 24. Bed material retaining ring; 31. Mounting plate; 32. Hydraulic cylinder mounting plate; 33. Hydraulic cylinder A; 34. Roller bracket; 35. Roller; 41. Arm end mounting plate; 4 2. Hydraulic cylinder support plate; 43. Hydraulic cylinder B; 44. External discharge knife for lifting material; 51. Mounting bracket; 52. T-shaped plate; 53. Cylinder support plate; 54. Cylinder; 55. Support roller; 56. Outer guide plate; 61. Feed pipe; 62. Distribution box; 63. Double magnetic pulley; 64. Slag discharge conveyor belt; 65. Iron removal conveyor belt; 66. Feeding wheel; 67. Distribution channel; 68. Iron discharge channel. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention. The following embodiments are used to illustrate this invention but should not be used to limit the scope of this invention.

[0035] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0036] The following is combined with Figures 1 to 9 The present invention will be further described in detail below, describing an iron removal system for steel slag vertical mill bed: In this embodiment, as Figure 1 and Figure 2 ( Figure 2 As shown in the figure (the mill housing is not shown), a steel slag vertical mill bed material iron removal system is provided, including: a vertical mill housing 1, and a grinding disc device 2 disposed inside the vertical mill housing.

[0037] A bed material rolling and loosening device 3 is provided above the grinding disc device. The bed material rolling and loosening device is fixed on the outer shell of the vertical mill. The bed material rolling and loosening device adopts a lifting roller. The roller is used to loosen and disperse the compacted bed material on the grinding disc body of the grinding disc device.

[0038] like Figure 3As shown, the bed material rolling and loosening device includes a mounting plate 31, a cylinder mounting plate 32, a hydraulic cylinder A 33, a guide column, a roller bracket 34, and a roller 35. The U-shaped mounting plate is fixed to the inner wall of the vertical mill housing. The cylinder mounting plate is welded and fixed to the mounting plate. The hydraulic cylinder A and the guide column are mounted on the cylinder mounting plate. The guide column is mounted on the cylinder mounting plate via a linear bearing and is located around the cylinder. The hydraulic cylinder A and the guide column are both connected to the roller bracket. The roller is mounted on the roller bracket via a bearing. When the piston rod of the hydraulic cylinder A extends or retracts, it drives the roller to move up and down. After the roller descends, it contacts the bed material, the grinding disc rotates, and the roller loosens and disperses the bed material. In this embodiment, the roller is a conical, toothed roller.

[0039] like Figure 4 As shown, a bed material removal and unloading device 4 is provided behind the bed material rolling and loosening device. The bed material removal and unloading device is fixed on the inner wall of the vertical mill shell. The bed material removal and unloading device includes a lifting and unloading blade. The lifting and unloading blade is used to throw the loosened and dispersed bed material towards the edge of the grinding disc.

[0040] The material removal and unloading device includes an arm end mounting plate 41, a hydraulic cylinder support plate 42, a hydraulic cylinder B 43, and a material lifting and unloading knife 44. The arm end mounting plate is fixed to the inner wall of the vertical mill shell, and the hydraulic cylinder support plate is welded and fixed to the arm end mounting plate. The hydraulic cylinder support plate is equipped with a hydraulic cylinder B and a guide column. The hydraulic cylinder B and the guide column are both connected to the material lifting and unloading knife. When the piston rod of the hydraulic cylinder B extends and retracts, it drives the material lifting and unloading knife to move up and down.

[0041] The bed material rolling and loosening device and the bed material removal and unloading device are used in conjunction. In this embodiment, two sets of the bed material rolling and loosening device and the bed material removal and unloading device are symmetrically arranged above the grinding disc. With the rotation direction of the grinding disc as a reference, the bed material removal and unloading device is located behind the bed material rolling and loosening device. After the compacted bed material is loosened and dispersed by the rollers, it is thrown towards the edge of the grinding disc by the material discharge blades, completing the material removal process.

[0042] When the bed material removal and unloading device is in use, the material lifting and unloading knife can be raised and lowered synchronously with the roller, or it can be lowered later than the roller. That is, the roller is lowered first, and after the grinding disc rotates for a certain period of time, the material lifting and unloading knife is lowered.

[0043] like Figure 5 and Figure 6As shown, a grinding disc anvil 22 is provided on the grinding disc body 21. The grinding disc anvil is located below the roller. An edge pressure plate 23 presses against the edge of the grinding disc anvil and is connected to the grinding disc body. The bed material retaining ring 24 is annular, and its inner wall is close to the edge pressure plate. The bed material retaining ring is connected to a lifting mechanism. The bed material retaining ring is controlled by the lifting mechanism 5 and moves up and down relative to the edge pressure plate. Multiple lifting mechanisms are evenly distributed around the bed material retaining ring, such as... Figure 7 As shown.

[0044] The lifting mechanism includes a mounting bracket 51, a T-shaped plate 52, a cylinder support plate 53, a cylinder 54, and supporting rollers 55. The mounting bracket is fixed to the inner wall of the vertical mill housing and connected to the cylinder support plate. The inner end face of the mounting bracket is abutted against the T-shaped plate. The cylinder is fixed to the cylinder support plate, and its piston rod is connected to the horizontal plate of the T-shaped plate. Supporting rollers are provided on the vertical plate of the T-shaped plate and are connected to the bed material retaining ring. When the piston rod of the cylinder moves up and down, the T-shaped plate drives the supporting rollers to move up and down accordingly, which in turn drives the bed material retaining ring to move up and down. An outer guide plate 56 is provided on the T-shaped plate, and the outer guide plate is close to the bed material retaining ring.

[0045] like Figure 8 and Figure 9 As shown, the double-belt iron removal device 6 is connected to the vertical mill shell. The double-belt iron removal device includes a feed pipe 61, a distribution box 62, a magnetic double-belt pulley 63, a slag discharge conveyor belt 64, and an iron removal conveyor belt 65. The distribution box is equipped with a feed pipe, and the distribution box contains a slag discharge conveyor belt, an iron removal conveyor belt, and two longitudinally arranged magnetic double-belt pulleys. The magnetic double-belt pulleys are equipped with belt tensioning devices, and a distribution channel 67 is formed between the two magnetic double-belt pulleys. A feeding wheel 66 is installed inside the distribution channel, and the slag discharge conveyor belt is installed below the distribution channel. An iron discharge channel 68 is provided between the outer side of the magnetic double-belt pulleys and the iron removal conveyor belt.

[0046] After the bed material passes through the feed pipe, it falls along the distribution channel. Because the magnet is close to the inner side of the magnetic double pulleys (the opposite sides of the two magnetic double pulleys), the iron powder in the bed material is attracted to the belt surface, while the slag powder (excluding iron powder) in the bed material falls onto the slag discharge conveyor belt. The iron powder moves upwards under the drive of the belt, then moves to the outer side of the magnetic double pulleys, falls into the iron discharge channel, and then onto the iron removal conveyor belt.

[0047] A scraper is provided on the lower outer side of the magnetic double pulley. The scraper is attached to the belt and is used to scrape off the iron powder stuck to the belt.

[0048] The workflow of this embodiment includes a grinding process and a bed material removal process. The grinding process of this embodiment is the same as that of a conventional steel slag vertical mill, specifically as follows: In this embodiment, driven by the main motor of the vertical mill, the steel slag material falling at the center of the grinding disc moves from the center to the edge of the grinding disc liner under the action of centrifugal force, forming a material layer. The grinding roller 7 applies pressure to the material layer through a hydraulic device, and the material is ground into finished product under the action of vertical and shear forces. The fine powder of the finished product rises with the airflow and enters the finished product channel. Under the action of centrifugal force and the shear force of the grinding roller, some large particles and difficult-to-grind slag (containing iron elements) cross the baffle ring and enter the spray ring inlet along the guide plate. The material falling into the spray ring inlet is sent into the feed pipe of the double belt iron removal device by the scraper. The iron-removed material enters the dry jig to remove the RO-rich solid solution. The remaining material is sent into the vertical mill shell through the return material elevator and re-grinds in the vertical mill.

[0049] In this embodiment, under normal grinding conditions, after a period of time—approximately 40 minutes in this embodiment—a bed material removal process unique to this embodiment is performed. Specifically: When the lifting mechanism is activated, the piston rod of the hydraulic cylinder of the electrically controlled lifting mechanism moves down, and the T-shaped plate connected to the piston rod moves down synchronously. The support rollers installed on the T-shaped plate drive the bed material retaining ring to move down until it is flush with the upper surface of the grinding disc anvil.

[0050] Start the bed material rolling and loosening device. Hydraulic cylinder A works, causing the roller support and roller to move down. The roller comes into contact with the compacted bed material on the grinding disc device. As the pressure increases, the bed material will be loosened.

[0051] Subsequently, the bed material removal and unloading device is activated. Hydraulic cylinder B causes the material lifting and unloading blade to move downwards, with its bottom surface lightly contacting the grinding disc anvil. As the grinding disc rotates, the material lifting and unloading blade automatically throws the loosened bed material towards the edge of the grinding disc through its inner polished surface. The material falling along the guide plate into the spray ring nozzle is then fed into the feed pipe of the double-belt iron removal device by the scraper.

[0052] After the material enters the distribution box, it encounters the feeding wheel. The high-speed rotation of the feeding wheel throws and scatters the material. The slag powder, under the influence of gravity, falls naturally within the distribution channel. Because the belt is equipped with a magnet, the iron elements (iron powder) in the falling slag powder are attracted to the surface of the belt and move with it. When the iron powder moves to the point where the belt detaches from the belt roller, the magnetic force disappears. The iron powder then falls off naturally, enters the separation port, and flows into the iron removal conveyor belt through the iron discharge channel. The slag powder, however, is not attracted by the magnetic force and falls directly into the slag outlet, flowing into the slag discharge conveyor belt.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steel slag vertical mill material iron removal system, comprising: A vertical mill housing and a grinding disc device disposed inside the vertical mill housing, characterized in that a bed material rolling and loosening device is disposed above the grinding disc device, the bed material rolling and loosening device is fixed on the vertical mill housing, the bed material rolling and loosening device adopts a lifting roller, the roller is used to loosen and disperse the compacted bed material on the grinding disc body of the grinding disc device, after the roller descends, it contacts the bed material, the grinding disc body rotates, and the roller loosens and disperses the bed material; A bed material removal and unloading device is provided behind the bed material rolling and loosening device. The bed material removal and unloading device is fixed on the inner wall of the vertical mill shell. The bed material removal and unloading device includes a lifting and unloading blade. The lifting and unloading blade is used to throw the loosened and dispersed bed material towards the edge of the mill disc. The double-belt iron removal device is connected to the shell of the vertical mill. The double-belt iron removal device includes a feed pipe, a distribution box, magnetic double-belt pulleys, a slag discharge conveyor belt, and an iron removal conveyor belt. The feed pipe is provided on the distribution box. The slag discharge conveyor belt, the iron removal conveyor belt, and two longitudinally arranged magnetic double-belt pulleys are provided inside the distribution box. A distribution channel is formed between the two magnetic double-belt pulleys. The slag discharge conveyor belt is provided below the distribution channel. An iron discharge channel is provided between the outer side of the magnetic double-belt pulleys and the iron removal conveyor belt. After the bed material passes through the feed pipe, it falls along the distribution channel. The slag powder in the bed material falls onto the slag discharge conveyor belt, and the iron powder in the bed material is adsorbed onto the surface of the belt and moves to the outside of the magnetic double pulley under the drive of the belt, falls into the iron discharge channel, and then falls onto the iron removal conveyor belt. The material distribution channel is equipped with a feeding wheel, which is used to break up the bed material; The bed material retaining ring is connected to the lifting mechanism.

2. The steel slag vertical mill material iron removal system as described in claim 1, characterized in that, The bed material rolling and loosening device includes a mounting plate, a hydraulic cylinder mounting plate, a hydraulic cylinder A, a guide column, a roller bracket, and a roller. The mounting plate is fixed to the inner wall of the vertical mill housing, and the hydraulic cylinder mounting plate is fixed to the mounting plate. The hydraulic cylinder A and the guide column are mounted on the hydraulic cylinder mounting plate. Both the hydraulic cylinder A and the guide column are connected to the roller bracket. The roller is mounted on the roller bracket. When the piston rod of the hydraulic cylinder A extends or retracts, it drives the roller to move up and down.

3. The steel slag vertical mill material iron removal system as described in claim 1 or 2, characterized in that, The roller is a conical, toothed roller.

4. The steel slag vertical mill material iron removal system as described in claim 1, characterized in that, The material removal and unloading device includes an arm end mounting plate, a hydraulic cylinder support plate, a hydraulic cylinder B, and a material lifting and unloading knife. The arm end mounting plate is fixed to the inner wall of the vertical mill shell, and the hydraulic cylinder support plate is fixed to the arm end mounting plate. The hydraulic cylinder support plate is equipped with a hydraulic cylinder B and a guide column. Both the hydraulic cylinder B and the guide column are connected to the material lifting and unloading knife. When the piston rod of the hydraulic cylinder B extends or retracts, it drives the material lifting and unloading knife to move up and down.

5. The steel slag vertical mill material iron removal system as described in claim 1, characterized in that, A grinding disc anvil is provided on the grinding disc body. The grinding disc anvil is located below the roller. An edge pressure plate is pressed on the edge of the grinding disc anvil and connected to the grinding disc body. The bed material retaining ring is circular, and its inner wall is close to the edge pressure plate.

6. The steel slag vertical mill material iron removal system as described in claim 5, characterized in that, The lifting mechanism includes a mounting bracket, a T-shaped plate, a cylinder support plate, a cylinder, and support rollers. The mounting bracket is fixed to the inner wall of the vertical mill housing and connected to the cylinder support plate. The cylinder is fixed to the cylinder support plate, and its piston rod is connected to the T-shaped plate. Support rollers are provided on the T-shaped plate and are connected to the bed material retaining ring.

7. The steel slag vertical mill material iron removal system as described in claim 6, characterized in that, An outer guide plate is provided on the T-shaped plate, and the outer guide plate is close to the bed material retaining ring.

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