Steel slag magnetic separation fine powder production line and production method

Abstract

The steel slag magnetic separation fine powder production line comprises a machine frame, a steel slag bin, a first vibrating screen, a second vibrating screen, a rod mill, a third vibrating screen and a magnetic separation vibrating machine, and the steel slag bin, the first vibrating screen, the second vibrating screen, the rod mill, the third vibrating screen and the magnetic separation vibrating machine are sequentially arranged. The second vibrating screen is connected with the rod mill through a second conveying mechanism, the rod mill is connected with the third vibrating screen through a third conveying mechanism, the third vibrating screen is connected with the magnetic separation vibrating machine through a fourth conveying mechanism, and the fourth conveying mechanism is connected with the second vibrating screen through a sixth conveying mechanism. According to the invention, a three-stage screening mode consisting of the first, second and third vibrating screens is adopted, all the vibrating screens are formed by connecting a plurality of bar-type screens in series, high efficiency and precision of screening are ensured, and a three-stage magnetic separation mode consisting of the iron removal machine, the magnetic separation stock bin and the magnetic separation vibrating machine is adopted, so that the purity of steel slag is ensured, and each device is better protected.

Description

Technical Field

[0001] The invention relates to steel smelting machinery, and in particular to a steel slag magnetic separation fine powder production line and a production method. Background Art

[0002] The steel slag produced in the process of steel smelting is solid waste, and its direct landfill will cause serious environmental pollution. In order to achieve green and environmental protection of steel smelting, comprehensively and rationally utilize its solid waste, and improve the overall benefits of the enterprise, a method for the automatic production process of extracting iron-containing material from steel slag, namely magnetic separation concentrate, has been developed.

[0003] At present, the domestic slag magnetic separation fine powder production line has not been fully popularized and is still in the development stage. Its working process is that the operator performs remote operation in the main control room, and it has not yet reached the level of full automation. The actual situation in the rod mill is not displayed in real time. The actual amount of slag in the rod mill is controlled by the amount of addition. The amount of slag in each key process is not measured by production. The above factors cause unstable quality and are prone to quality and equipment accidents. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a steel slag magnetic separation fine powder production line with reasonable design and full-process automatic control in view of the deficiencies in the prior art.

[0005] Another technical problem to be solved by the present invention is to provide a production method with a reasonable design and realizing efficient magnetic separation of steel slag by using the above-mentioned steel slag magnetic separation fine powder production line in view of the deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A steel slag magnetic separation fine powder production line and production method, characterized in that it comprises a frame and a steel slag bin, a first vibrating screen, a second vibrating screen, a rod mill, a third vibrating screen and a magnetic separation vibrator arranged in sequence, a feeding port is arranged at the top of the steel slag bin, a slag discharge bin door is installed at the bottom of the steel slag bin, the first vibrating screen is arranged below the steel slag bin, the first vibrating screen is connected to the second vibrating screen through a first conveying mechanism, the second vibrating screen is connected to the rod mill through a second conveying mechanism, the rod mill is connected to the third vibrating screen through a third conveying mechanism, the third vibrating screen is connected to the magnetic separation vibrator through a fourth conveying mechanism, the fourth conveying mechanism is connected to the second vibrating screen through a sixth conveying mechanism, and the third vibrating screen is connected to the second conveying mechanism through a seventh conveying mechanism; The first, second and third vibrating screens are all steel bar vibrating screens, which are formed by connecting a number of bar screens in series, and the bar screens include a vibrating frame and a number of layers of steel bars horizontally inserted in the vibrating frame, a feeding port is provided at the top of the vibrating frame, a discharging port is provided at the bottom of the vibrating frame, the vibrating frame is mounted on the frame through an elastic mechanism, a vibrating motor is mounted on the outer wall of the vibrating frame, the spacing between adjacent steel bars of each layer of the bar screens is equal, the spacing between steel bars of the first vibrating screen is greater than the spacing between steel bars of the second vibrating screen, and the spacing between steel bars of the second vibrating screen is equal to the spacing between steel bars of the third vibrating screen; The rod mill comprises a base and a horizontally arranged rotating cylinder, end covers are arranged at both ends of the rotating cylinder, a hollow rotating shaft is arranged in the center of the end covers, the hollow rotating shaft is installed on the base through bearings, the hollow rotating shaft at one end of the rotating cylinder is connected to the feed hopper arranged on the base, a slag outlet is arranged on the lining plate at the other end of the rotating cylinder, a discharging port on the rotating cylinder at the slag outlet, a receiving hopper connected to the third conveying mechanism is arranged below the discharging port, a lining plate with a circle fixed on the inner wall of the rotating cylinder, and a plurality of wear-resistant round steel rods with a diameter of 140 mm are arranged in the rotating cylinder; The magnetic separation vibrator is provided with a feed inlet at the top and a discharge port at the bottom. A magnetic separation bin is installed at the feed inlet, a magnetic separation roller is provided below the discharge port, and a partition plate for separating parts with high iron content and parts with low iron content is provided below the center of the magnetic separation roller. A magnetic separation powder bin and a tailings bin are provided on both sides of the partition plate, respectively. The partition plate is connected to the magnetic separation powder bin and the tailings bin respectively through an eighth conveying mechanism; The first conveying mechanism, the second conveying mechanism, the third conveying mechanism, the fourth conveying mechanism, the fifth conveying mechanism, the sixth conveying mechanism, the seventh conveying mechanism and the eighth conveying mechanism include conveying belts and support rollers for supporting the conveying belts, the support rollers are installed on the frame, and the support rollers at the output end of the conveying belts are installed with roller scales for online real-time weighing to monitor the real-time production status of each key process.

[0007] The technical problem to be solved by the present invention can also be achieved through the following technical scheme, the lining plate is provided with a lining plate body, the back of the lining plate body is provided with a mounting surface matched with the inner wall of the rotating cylinder, the mounting surface is an arc-shaped surface with the same curvature as the rotating cylinder, the front of the lining plate body is provided with a wavy surface, the trough of the wavy surface is set as a chute, and the crest of the wavy surface of one row of liners is provided with a groove for pushing the material to make the steel slag creep by itself, the axis of the groove is arranged to intersect with the crest, the groove is arranged in an oblong shape, and the steel slag outlet is a plurality of long strip holes for filtering steel slag, the width of the long strip holes is 40mm, so that steel slag less than 40mm can flow out.

[0008] The technical problem to be solved by the present invention can also be achieved through the following technical solution: several layers of horizontally arranged magnetic screens are installed in the magnetic separation bin, the sides of the magnetic screens are fixed on the inner wall of the magnetic separation bin, and the meshes of adjacent magnetic screens are staggered.

[0009] The technical problem to be solved by the present invention can also be achieved by the following technical solution: an infrared altimeter for real-time measurement of the height of the slag in the bin is installed at the feeding port of the slag bin.

[0010] The technical problem to be solved by the present invention can also be achieved by the following technical solution: an infrared probe for real-time display of the operating status of the rod mill and the status of steel slag and steel rods is installed at the entrance of the rod mill.

[0011] The technical problem to be solved by the present invention can also be achieved by the following technical scheme: a control center for controlling a height infrared altimeter is installed on the frame, and the roller scale, infrared probe, first conveying mechanism, second conveying mechanism, third conveying mechanism, fourth conveying mechanism, fifth conveying mechanism, sixth conveying mechanism, seventh conveying mechanism and eighth conveying mechanism are all connected to the control center.

[0012] A production method using the above steel slag magnetic separation fine powder production line is characterized in that the method comprises the following steps: (1) The slag is stored in the slag bin. After receiving the slag discharge command, the slag bin door opens and the slag falls onto the first vibrating screen; (2) After receiving the work instruction, the first vibrating screen vibrates, and the steel slag smaller than 300 mm is transported to the second vibrating screen for screening through the first conveying mechanism, and the steel slag larger than 300 mm is transported to the mechanical crushing plant through the fifth conveying mechanism for mechanical crushing. When passing through the first conveying mechanism, the steel in the steel slag is removed by the iron remover. A roller scale is provided at the discharge end of the first conveying mechanism to weigh the steel slag after iron removal and transmit the data to the control center; (3) After passing through the second vibrating screen, the slag with a particle size of less than 10 mm is transported by the sixth conveying mechanism to the fourth conveying mechanism in front of the magnetic separation vibrator. The slag with a particle size greater than 10 mm is transported by the second conveying mechanism to the rod mill for grinding. A roller scale is provided in front of the grinder to weigh the slag before entering the rod mill and transmit the data to the control center; (4) The ground slag is sent to the third vibrating screen for screening via the third conveying mechanism. The slag with a particle size greater than 10 mm is sent to the second conveying mechanism in front of the rod mill via the seventh conveying mechanism and re-enters the rod mill for grinding. The slag with a particle size less than 10 mm is transported to the magnetic separation bin by the fourth conveying mechanism. (5) The steel slag in the magnetic separation silo falls evenly onto the rotating magnetic separation roller through the magnetic separation vibrator, and is separated into high-iron content and low-iron content parts on the magnetic separation roller. They fall onto different eighth conveying mechanisms through the separation plates, are weighed, and then are transported to the magnetic separation fine powder silo and tailings silo respectively.

[0013] The technical problem to be solved by the present invention can also be achieved by the following technical scheme. The working parameters of the rod mill are: the length of the rotating cylinder is 4500mm, the inner diameter is 2700mm, the rotation speed is 0.2-18r / min, the main motor power is 500Kw, the loading amount of steel rods is 10-30 tons, the loading amount of steel slag is 5-20 tons, the grinding capacity is 40-60 tons / h, and the specification of the steel rod is Φ140*4500mm.

[0014] Compared with the prior art, the present invention has the following technical effects: First, the three-stage screening method consisting of the first, second and third vibrating screens is used to improve the screening effect of steel slag. All vibrating screens are composed of multiple rod screens connected in series to ensure screening efficiency and accuracy. Second, a three-stage magnetic separation method consisting of an iron remover, a magnetic separation bin and a magnetic separation vibrator is used to ensure the purity of the slag and better protect each device; Third, by installing high-strength wear-resistant round steel rods with a diameter of 140mm in the rod mill, the grinding effect is improved and the consumption of round steel is reduced; Fourth, by installing roller scales in each conveying mechanism, the production volume of each key process is weighed online in real time, and the real-time production status of each key process is monitored in real time, especially to ensure the amount of slag in the rod mill and ensure the normal operation of the rod mill; Fifth, by installing an infrared altimeter in the slag bin, the height of the slag in the bin can be measured in real time to control the loading time and quantity of the slag; an infrared probe is installed at the entrance of the rod mill to display the operating status of the rod mill and the status of the slag and steel rods in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of the steel slag magnetic separation fine powder production line and production method of the present invention; Figure 2 This is the layout diagram of the liner in the rotary drum; Figure 3 for Figure 2 DD-direction expansion diagram; Figure 4 This is the structural diagram of the liner; Figure 5 for Figure 4 AA section view; Figure 6 This is the structural diagram of the slag outlet.

[0016] In the figure: 1-the second vibrating screen, 2-roller scale, 3-iron remover, 4-the first vibrating screen, 5-slag bin, 6-slag, 7-infrared altimeter, 8-bin door, 9-the fifth conveying mechanism, 10-mechanical crushing plant, 11-the third vibrating screen, 12-the fourth conveying mechanism, 13-tailings bin, 14-magnetic separation bin, 15-magnetic separation vibrator, 16-magnetic separation roller, 17-partition plate, 18-rod mill, 19-fine powder bin, 20-the second conveying mechanism, 21-the sixth conveying mechanism, 22-the seventh conveying mechanism, 23-the eighth conveying mechanism, 24-the third conveying mechanism, 25-rotating cylinder, 26-lining plate, 27-groove, 28-wavy surface, 29-installation surface, 30-slag outlet. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0018] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0019] Reference Figure 1-5 , a steel slag magnetic separation fine powder production line, comprising a frame and a steel slag bin 5, a first vibrating screen 4, a second vibrating screen 1, a rod mill 18, a third vibrating screen 11 and a magnetic separation vibrator 15 arranged in sequence, the top of the steel slag bin 5 is provided with a feed port, the bottom of the steel slag bin 5 is provided with a slag bin door 8, the first vibrating screen 4 is arranged below the steel slag bin 5, the first vibrating screen 4 and the second vibrating screen 2 are connected through a first conveying mechanism 2, the second vibrating screen 1 and the rod mill 18 are connected through a second conveying mechanism 20, the rod mill 18 and the third vibrating screen 11 are connected through a third conveying mechanism 24, the third vibrating screen 11 and the magnetic separation vibrator 15 are connected through a fourth conveying mechanism 12, the fourth conveying mechanism 12 is connected to the second vibrating screen 1 through a sixth conveying mechanism 21, and the third vibrating screen 11 is connected to the second conveying mechanism 20 through a seventh conveying mechanism 22; The first, second and third vibrating screens are all steel bar vibrating screens, which are formed by connecting several bar screens in series. The bar screens include a vibrating frame and several layers of steel bars horizontally inserted in the vibrating frame. A feed port is provided at the top of the vibrating frame, a discharge port is provided at the bottom of the vibrating frame, and a blanking gap communicating with the feed port and the discharge port is provided between adjacent steel bars. The vibrating frame is installed on the frame through an elastic mechanism, and a vibrating motor is installed on the outer wall of the vibrating frame. The spacing between adjacent steel bars of each layer of the bar screens is equal, the spacing between steel bars of the first vibrating screen is greater than the spacing between steel bars of the second vibrating screen, and the spacing between steel bars of the second vibrating screen is equal to the spacing between steel bars of the third vibrating screen. The spacing between adjacent steel bars of the first vibrating screen is 300 mm, and the spacing between adjacent steel bars of the second vibrating screen and the third vibrating screen is 10 mm. The rod mill comprises a base and a horizontally arranged rotating cylinder 25, end covers are arranged at both ends of the rotating cylinder 25, a hollow rotating shaft is arranged in the center of the end cover, the hollow rotating shaft is installed on the base through a bearing, the hollow rotating shaft at one end of the rotating cylinder is connected to the feed hopper arranged on the base, a liner plate at the other end of the rotating cylinder is provided with a slag outlet 30, a discharge port is arranged on the rotating cylinder at the slag outlet 30, a receiving hopper connected to the third conveying mechanism is installed below the discharge port, a liner plate is fixed on the inner wall of the rotating cylinder, and a plurality of wear-resistant round steel rods with a diameter of 140 mm are arranged in the rotating cylinder; A magnetic separation bin 14 is installed at the feed inlet of the magnetic separation vibrator 15, and several layers of horizontally arranged magnetic screens are installed in the magnetic separation bin 14. The sides of the magnetic screens are fixed on the inner wall of the magnetic separation bin, and the meshes of adjacent magnetic screens are staggered. The mesh diameter of the magnetic screen is 10 mm. A magnetic separation roller 16 is provided below the discharge port of the magnetic separation vibrator 15, and a partition plate 17 for separating the parts with high iron content and the parts with low iron content is provided below the center of the magnetic separation roller 16. A magnetic separation fine powder bin 19 and a tailings bin 13 are provided on both sides of the partition plate 16, and the partition plate 17 is connected to the magnetic separation fine powder bin 19 and the tailings bin 13 respectively through the eighth conveying mechanism 23.

[0020] The liner 26 is provided with a liner body, and a mounting surface 29 matching the inner wall of the rotary cylinder is provided on the back of the liner body, and the mounting surface 29 is an arc surface with the same arc as the rotary cylinder. The front of the liner body is provided with a wavy surface 28, and the valley of the wavy surface 28 is provided with a chute. The crest of the wavy surface 28 of one row of liner plates 26 is provided with a groove 27 for pushing the material to make the slag creep by itself, and the axis of the groove 27 is arranged to intersect with the crest. The slag outlet is a plurality of long strip holes for filtering the slag. The first conveying mechanism 2, the second conveying mechanism 20, the third conveying mechanism 24, the fourth conveying mechanism 12, the fifth conveying mechanism 9, the sixth conveying mechanism 21, the seventh conveying mechanism 22, and the eighth conveying mechanism 23 include conveying belts and support rollers for supporting the conveying belts, the support rollers are installed on the frame, and the support rollers at the output end of the conveying belts are installed with roller scales for online real-time weighing to monitor the real-time production status of each key process. The above-mentioned conveying mechanisms can be set to be horizontal or inclined according to the conveying direction or use requirements. The above-mentioned devices are all installed on the frame, and the main installation method is fixed installation.

[0021] An infrared altimeter 7 for measuring the height of the slag in the bin in real time is installed at the inlet of the slag bin 5 .

[0022] An infrared probe is installed at the entrance of the rod mill 18 to display the operating status of the rod mill and the status of steel slag and steel rods in real time.

[0023] A control center for controlling a height infrared altimeter is installed on the frame, and the roller scale, infrared probe, first conveying mechanism, second conveying mechanism, third conveying mechanism, fourth conveying mechanism, fifth conveying mechanism, sixth conveying mechanism, seventh conveying mechanism and eighth conveying mechanism are all connected to the control center.

[0024] The working process of the steel slag magnetic separation fine powder production line of the present invention is as follows: (1) The slag bin 5 has a maximum slag storage capacity of 20 tons. A slag discharge bin door 8 is provided below the slag bin 5. The slag 6 is stored in the slag bin 5. After receiving the slag discharge command, the slag discharge bin door 8 opens, and the slag 6 flows out onto the first vibrating screen 4. An infrared altimeter 7 for measuring the material storage height is provided above the slag bin. The material height in the bin is fed back to the control center and the main operation room 10 in real time. When the infrared altimeter 7 detects that the material height drops to 1 / 5 of the bin position, the control center notifies the loading of the material.

[0025] (2) After receiving the work order, the first vibrating screen 4 vibrates. It is a steel bar vibrating screen. The minimum spacing of the steel bars of the bottom bar screen is 300 mm. The steel slag 9 larger than 300 mm is sent to the mechanical crushing plant 10 for mechanical crushing via the fifth conveying mechanism 9. The steel slag smaller than 300 mm is sent to the second vibrating screen 1 for screening via a conveying mechanism 2. There is an iron remover 3 on this section of the conveyor belt to remove the steel from the steel slag to avoid damaging the equipment in the subsequent process. The maximum adsorption capacity of the iron remover is 2 tons. There is a roller scale 2 behind the iron remover, i.e., a roller weighing instrument, which weighs the steel slag after iron removal and transmits the data to the control center.

[0026] (3) After the slag is screened by the second vibrating screen 1, the particle size is less than 10 mm, and the slag is transported by the sixth conveying mechanism 22 to the fourth conveying mechanism 12 in front of the second vibrating screen 14. The slag with a particle size greater than 10 mm is transported to the rod mill 18 for grinding by the second conveying mechanism 20. A roller weighing instrument is provided in front of the grinding machine to weigh the slag before entering the rod mill and transmit the data to the control center.

[0027] The main parameters of the rod mill are: drum length 4500mm, inner diameter 2700mm, rotation speed 0.2-18r / min, main motor power 500Kw, steel rod loading 10-30 tons, steel slag loading 5-20 tons, grinding capacity 40-60 tons / h, steel rod specification is Φ140*4500mm, and the material is high-strength wear-resistant steel. There are weighing instruments before and after the rod mill. The control center controls the amount of steel slag in the rod mill to ensure that the amount of steel slag is within 5-20 tons. When the weight exceeds this, the belt 20 and the equipment before it will be stopped. When it is less than 5 tons, the rod mill 18 will be closed.

[0028] (4) The ground slag is transported to the third vibrating screen 11 by the third conveying mechanism for screening. The slag with a particle size greater than 10 mm is transported to the second conveying mechanism 20 in front of the rod mill by the seventh conveying mechanism 22 and re-enters the rod mill for grinding. The slag with a particle size less than 10 mm is transported to the magnetic separation bin 14 by the fourth conveying mechanism.

[0029] (5) The steel slag in the magnetic separation bin 14 evenly falls onto the rotating magnetic separation roller 16 through the magnetic separation vibrator 15, and is separated into parts with high iron content and parts with low iron content on the magnetic separation roller. The parts fall onto different eighth conveying mechanisms 23 through the partition plate 17, are weighed, and are then conveyed to the magnetic separation fine powder bin 19 and the tailings bin 13, respectively.

[0030] The operation of all equipment in the present invention is controlled by a computer in the control center. Equipment abnormalities and process parameter abnormalities in each process are equipped with alarm warnings. Each process is monitored by video, and the working screen is displayed in real time on the monitoring screen of the main control room.

[0031] The working process of the present invention is that the operator performs remote operation in the control center to achieve the degree of full automation, and the actual situation in the rod mill can be displayed in real time, thereby ensuring the stability of quality and avoiding quality and equipment accidents.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A steel slag magnetic separation fine powder production line, characterized in that: It comprises a frame and a slag bin, a first vibrating screen, a second vibrating screen, a rod mill, a third vibrating screen and a magnetic separation vibrator which are arranged in sequence. The top of the slag bin is provided with a feeding port, the bottom of the slag bin is provided with a slag discharge bin door, the first vibrating screen is arranged below the slag bin, the first vibrating screen is connected to the second vibrating screen through a first conveying mechanism, the second vibrating screen is connected to the rod mill through a second conveying mechanism, the rod mill is connected to the third vibrating screen through a third conveying mechanism, the third vibrating screen is connected to the magnetic separation vibrator through a fourth conveying mechanism, the fourth conveying mechanism is connected to the second vibrating screen through a sixth conveying mechanism, and the third vibrating screen is connected to the second conveying mechanism through a seventh conveying mechanism; The first, second and third vibrating screens are all steel bar vibrating screens, which are formed by connecting a number of bar screens in series vertically, each bar screen comprising a vibrating frame and a number of layers of steel bars horizontally inserted in the vibrating frame, a feeding port is provided at the top of the vibrating frame, a discharging port is provided at the bottom of the vibrating frame, the vibrating frame is mounted on the frame through an elastic mechanism, a vibrating motor is mounted on the outer wall of the vibrating frame, the spacing between adjacent steel bars of each layer of the bar screens is equal, the spacing between steel bars of the first vibrating screen is greater than the spacing between steel bars of the second vibrating screen, and the spacing between steel bars of the second vibrating screen is equal to the spacing between steel bars of the third vibrating screen; The rod mill comprises a base and a horizontally arranged rotating cylinder, end covers are arranged at both ends of the rotating cylinder, a hollow rotating shaft is arranged in the center of the end cover, the hollow rotating shaft is installed on the base through a bearing, the hollow rotating shaft at one end of the rotating cylinder is connected to a feed hopper arranged on the base, a liner plate at the other end of the rotating cylinder is provided with a slag outlet, a discharge port is arranged on the rotating cylinder at the slag outlet, a receiving hopper connected to a third conveying mechanism is installed below the discharge port, a liner plate is fixed on the inner wall of the rotating cylinder, and a plurality of wear-resistant round steel bars are arranged in the rotating cylinder; The magnetic separation vibrator is provided with a feed inlet at the top and a discharge port at the bottom. A magnetic separation bin is installed at the feed inlet, a magnetic separation roller is provided below the discharge port, and a partition plate for separating parts with high iron content and parts with low iron content is provided below the center of the magnetic separation roller. A magnetic separation powder bin and a tailings bin are provided on both sides of the partition plate, respectively. The partition plate is connected to the magnetic separation powder bin and the tailings bin respectively through an eighth conveying mechanism; The first conveying mechanism, the second conveying mechanism, the third conveying mechanism, the fourth conveying mechanism, the fifth conveying mechanism, the sixth conveying mechanism, the seventh conveying mechanism and the eighth conveying mechanism include conveying belts and support rollers for supporting the conveying belts, the support rollers are installed on the frame, and the support rollers at the output end of the conveying belts are installed with roller scales for online real-time weighing to monitor the real-time production status of each key process.

2. A steel slag magnetic separation fine powder production line according to claim 1, characterized in that: The lining plate is provided with a lining plate body, and the back of the lining plate body is provided with a mounting surface matching with the inner wall of the rotating cylinder, and the mounting surface is an arc-shaped surface with the same curvature as the rotating cylinder. The front of the lining plate body is provided with a wavy surface, and the valley of the wavy surface is provided with a chute. The crest of the wavy surface of one row of lining plates is provided with a groove which is convenient for pushing materials to make the steel slag creep by itself, and the axis of the groove is arranged crosswise with the crest.

3. A steel slag magnetic separation fine powder production line according to claim 2, characterized in that: The groove is arranged in an oblong shape, and the slag outlet is a plurality of long strip holes for filtering the slag.

4. A steel slag magnetic separation fine powder production line according to claim 1, characterized in that: Several layers of horizontally arranged magnetic screens are installed in the magnetic separation bin, the sides of the magnetic screens are fixed on the inner wall of the magnetic separation bin, and the meshes of adjacent magnetic screens are staggered.

5. The steel slag magnetic separation fine powder production line according to claim 1, characterized in that: The spacing between adjacent steel bars of the first vibrating screen is 300 mm, and the spacing between adjacent steel bars of the second vibrating screen and the third vibrating screen is 10 mm.

6. A steel slag magnetic separation fine powder production line according to claim 1, characterized in that: An infrared altimeter for measuring the height of the slag in the bin in real time is installed at the feeding port of the slag bin.

7. The steel slag magnetic separation fine powder production line according to claim 1, characterized in that: An infrared probe for real-time display of the operating status of the rod mill and the status of steel slag and steel rods is installed at the entrance of the rod mill.

8. A steel slag magnetic separation fine powder production line and production method according to claim 1, characterized in that: A control center for controlling a height infrared altimeter is installed on the frame, and the roller scale, infrared probe, first conveying mechanism, second conveying mechanism, third conveying mechanism, fourth conveying mechanism, fifth conveying mechanism, sixth conveying mechanism, seventh conveying mechanism and eighth conveying mechanism are all connected to the control center.

9. A production method using the steel slag magnetic separation fine powder production line according to any one of claims 1 to 8, characterized in that: The method comprises the following steps, (1) The slag is stored in the slag bin. After receiving the slag discharge command, the slag bin door opens and the slag falls onto the first vibrating screen; (2) After receiving the work instruction, the first vibrating screen vibrates, and the steel slag smaller than 300 mm is transported to the second vibrating screen for screening through the first conveying mechanism, and the steel slag larger than 300 mm is transported to the mechanical crushing plant through the fifth conveying mechanism for mechanical crushing. When passing through the first conveying mechanism, the steel in the steel slag is removed by the iron remover. A roller scale is provided at the discharge end of the first conveying mechanism to weigh the steel slag after iron removal and transmit the data to the control center; (3) After passing through the second vibrating screen, the slag with a particle size of less than 10 mm is transported by the sixth conveying mechanism to the fourth conveying mechanism in front of the magnetic separation vibrator. The slag with a particle size greater than 10 mm is transported by the second conveying mechanism to the rod mill for grinding. A roller scale is provided in front of the grinder to weigh the slag before entering the rod mill and transmit the data to the control center; (4) The ground slag is sent to the third vibrating screen for screening via the third conveying mechanism. The slag with a particle size greater than 10 mm is sent to the second conveying mechanism in front of the rod mill via the seventh conveying mechanism and re-enters the rod mill for grinding. The slag with a particle size less than 10 mm is transported to the magnetic separation bin by the fourth conveying mechanism. (5) The steel slag in the magnetic separation silo falls evenly onto the rotating magnetic separation roller through the magnetic separation vibrator, and is separated into high-iron content and low-iron content parts on the magnetic separation roller. They fall onto different eighth conveying mechanisms through the separation plates, are weighed, and then are transported to the magnetic separation fine powder silo and tailings silo respectively.

10. The method for producing steel slag magnetic separation powder according to claim 9, characterized in that: The working parameters of the rod mill are: the length of the rotating cylinder is 4500mm, the inner diameter is 2700mm, the rotation speed is 0.2r / min-18r / min, the main motor power is 500Kw, the loading amount of steel rods is 10 tons-30 tons, the loading amount of steel slag is 5 tons-20 tons, the grinding capacity is 40 tons / h-60 tons / h, and the specification of the grinding rod is Φ140*4500mm.

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