A kind of even mixing and screening device and method for sintering ore blending slag iron powder in ironmaking

Abstract

This invention relates to the field of slag and iron powder screening technology, specifically to a mixing and screening device and method for slag and iron powder used in ironmaking sintering. The device includes: a main frame; a dual-drive motor fixedly mounted on the top of the main frame, with sliding frames connected to the front and rear ends of the motor; a screening frame slidably connected inside the main frame; a vibrating screen plate connected to the bottom of the screening frame within the main frame; an electromagnetic attracting plate slidably connected to the rear side wall of the main frame; and a magnetic separation conveyor belt connected to the left rear end of the main frame, with a secondary collection box placed at the bottom left end of the magnetic separation conveyor belt. The electromagnetic attracting plate adsorbs iron powder falling from the screen mesh during high-speed vibration of the screening frame into an inverted trapezoidal powder collection trough. The two-layer plate structure of the electromagnetic attracting plate increases the efficiency and recovery rate of iron powder screening, solving the problems of difficult separation of iron powder, useless residue, and gravel, low iron powder separation and recovery efficiency, and inconvenient iron powder collection.

Description

Technical Field

[0001] This invention relates to the field of slag and iron powder screening technology, specifically to a mixing and screening device and method for slag and iron powder used in ironmaking sintering and ore blending. Background Technology

[0002] Waste is generated during iron sintering and steelmaking. This waste includes small amounts of slag iron, casting residue, and desulfurization slag. To reduce manufacturing costs and improve waste recycling rates, it is necessary to screen the usable iron powder in this waste.

[0003] Given the above background, existing slag and iron powder mixing and screening devices can only distinguish and transport powder, granules, and gravel to different conveyor belts during the screening process. They cannot separate iron powder from these particles during this process. As a result, in subsequent iron powder separation processes, the iron powder is buried in useless residues, making separation and collection difficult. This leads to a large amount of iron powder being wasted, or further deep separation operations are still required, resulting in energy and resource waste. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a mixing and screening device and method for iron powder slag used in ironmaking sintering, which can effectively improve the efficiency and recovery rate of iron powder screening and recovery, in order to address the shortcomings of the existing technology.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] 1. A mixing and screening device for slag and iron powder used in ironmaking sintering.

[0007] This invention provides a mixing and screening device for slag iron powder used in ironmaking sintering, including a main frame 1. The top of the front side wall of the main frame 1 is connected to a feeding hopper 102 through a feeding pipe 101. A screw conveyor 2 is provided inside the feeding pipe 101. The feeding hopper 102 is located directly below the discharge port of the crusher.

[0008] The inner middle of the main frame 1 of the device is provided with a multi-layer screening rack 5. The two sides of the multi-layer screening rack 5 are connected to the dual drive motor 3 located at the top of the main frame 1 of the device through the sliding frame 4. Under the drive of the dual drive motor 3, the multi-layer screening rack 5 is vibrating up and down with the sliding frame 4. The multi-layer electromagnetic magnet plate 6 is interleaved in the multi-layer screening rack 5. The multi-layer electromagnetic magnet plate 6 is slidably inserted in the main frame 1 of the device. The lower inner part of the main frame 1 of the device is rotatably connected to the vibrating screen plate 7. The rotating end of the vibrating screen plate 7 is connected to the screening motor 9 installed on the outer wall of the main frame 1 of the device.

[0009] The bottom of the rear side wall of the main frame 1 of the device is connected to an iron powder collection tank 108. A hydraulic cylinder 8 is fixedly installed on the outside of the rear side wall of the iron powder collection tank 108. The hydraulic cylinder 8 is connected to the multi-layer electromagnetic attracting plate 6 through a telescopic hydraulic rod to drive the electromagnetic attracting plate 6 to be inserted laterally into the main frame 1 of the device or pulled back to the top of the iron powder collection tank 108.

[0010] The main frame 1 of the device is provided with a powder and slag conveyor belt 10 at the bottom. One end of the powder and slag conveyor belt 10 is directly opposite the bottom of the vibrating screen plate 7, and the other end is provided with a magnetic separation conveyor belt 11. The end of the magnetic separation conveyor belt 11 is provided with a secondary separation collection box 13. The top of the secondary separation collection box 13 near the magnetic separation conveyor belt 11 is provided with a scraper 1301.

[0011] Furthermore, one end of the feeding pipe 101 is connected to the top of the front side wall of the main frame 1 of the device, and the other end is bent downwards at an incline and connected to the feeding funnel 102.

[0012] Furthermore, the front and rear side walls of the main frame 1 of the device are symmetrically provided with limiting grooves 103 in the vertical direction. The top of the sliding frame 4 is connected to the dual drive motor 3, and the bottom passes through the limiting groove 103 and is connected to both sides of the multi-layer screening frame 5. The dual drive motor 3 drives the multi-layer screening frame 5 to vibrate up and down along the limiting groove 103 through the sliding frame 4.

[0013] Furthermore, a fixing block 104 is installed on the inner wall of the main frame 1 of the device at a position corresponding to the height of the multi-layer electromagnetic attractor plate 6. The multi-layer electromagnetic attractor plate 6 is inserted into the main frame 1 of the device by the hydraulic cylinder 8 and then rests on the fixing block 104.

[0014] Furthermore, the multi-layer screening rack 5 includes upper and lower screening plates, each screening plate having multiple screen holes. The upper screening plate has a stepped inclined structure with the left side lower and the right side higher, and the lower screening plate has a stepped inclined structure with the left side higher and the right side lower. Furthermore, the left side of the upper screening plate and the right side of the lower screening plate are provided with a gravel groove 502.

[0015] The vibrating screen plate 7 is located directly below the lower screening plate. The rotating end of the vibrating screen plate 7 is driven by the screening motor 9 to drive the vibrating screen plate 7 to rotate up and down as a whole. The side of the vibrating screen plate 7 away from the rotating end is directly opposite the gravel discharge port 105 opened on the outer wall of the main frame 1 of the device.

[0016] Furthermore, the multi-layer electromagnetic absorbing plate 6 includes upper and lower electromagnetic absorbing plates. Each electromagnetic absorbing plate has multiple inverted trapezoidal powder collection grooves 601 at equal intervals. After the multi-layer electromagnetic absorbing plate 6 is inserted into the main frame 1 of the device, the two electromagnetic absorbing plates are located at the bottom of the two screening plates respectively, and each electromagnetic absorbing plate is connected to the power supply to generate magnetism.

[0017] Furthermore, a limiting guide rod 1010 is horizontally arranged above the iron powder collection tank 108, and a sliding sleeve hole 602 is provided on the connecting plate between the multi-layer electromagnetic attracting plate 6 and the telescopic hydraulic rod. The sliding sleeve hole 602 is slidably sleeved on the limiting guide rod 1010.

[0018] Furthermore, the bottom of the powder and slag conveyor belt 10 is provided with a plurality of double conical rollers 106, and one end of the powder and slag conveyor belt 10 is directly opposite the bottom of the vibrating screen plate 7, and the other end is provided with a secondary selection bracket 109. The magnetic separation conveyor belt 11 is installed on the secondary selection bracket 109 through a rotating shaft column 14, and the rotating shaft column 14 is connected to the magnetic separation motor 12.

[0019] Furthermore, the bottom of the main frame 1 of the device is provided with a conveyor belt through groove 107 for the powder conveyor belt 10 to pass through.

[0020] II. A method for mixing and screening slag iron powder used in ironmaking sintering.

[0021] Based on the same inventive concept, this invention also provides a method for mixing and screening iron slag powder used in ironmaking sintering, employing the mixing and screening device described above, specifically including the following steps:

[0022] S1, Slag powder collection: The slag powder flowing out of the crusher outlet enters the feeding hopper and is transported to the top of the main frame of the device by the screw conveyor in the feeding pipe;

[0023] S2, Slag powder mixing and screening: The multi-layer screening frame vibrates vertically up and down under the drive of the dual-drive motor and the sliding frame, so that the lumps and gravel in the slag powder are separated from the powder. The separated lumps and gravel fall from the reserved lumps and gravel groove on the screening plate to the vibrating screen plate, and the lumps and gravel are discharged from the lumps and gravel discharge port opened on the side wall of the main frame of the device by the up and down rotation of the vibrating screen plate.

[0024] S3, one-time iron powder adsorption: the multi-layer electromagnetic magnetic plates are energized and inserted into the main frame of the device under the drive of the hydraulic cylinder. When the separated powder passes through the powder collection groove opened on the electromagnetic magnetic plates, the iron powder in the powder will be adsorbed in the powder collection groove. The remaining powder residue will fall onto the powder and slag conveyor belt through the vibrating screen plate.

[0025] S4, Primary iron powder collection: The multi-layer electromagnetic attracting plate is pulled back above the iron powder collection tank under the drive of the hydraulic cylinder and the power is cut off, causing the iron powder adsorbed in the collection tank to fall into the iron powder collection tank:

[0026] S5, Secondary iron powder adsorption: The powder residue conveyor belt transports the powder residue to below the magnetic separation conveyor belt, so that the remaining iron powder in the powder residue is adsorbed onto the magnetic separation conveyor belt;

[0027] S6, Secondary iron powder collection: The scraper installed on the top side of the secondary collection box scrapes the iron powder on the magnetic separation conveyor belt into the secondary collection box.

[0028] Compared with the prior art, the present invention has the following main advantages:

[0029] 1. This invention uses a dual-drive motor and a sliding frame to control the screening frame connected to the bottom of the sliding frame to vibrate at high speed, so as to separate powder and gravel. The powder falls through the stepped screen holes of the screening frame, while the gravel rolls from the gravel groove left by the screening frame and falls onto the vibrating screen plate. The screening motor controls the right end of the vibrating screen plate to move up and down, so as to discharge the gravel from the gravel discharge port of the main frame of the device. This facilitates the screening operation of iron powder, residue and gravel, so as to classify and recycle iron powder, residue and gravel.

[0030] 2. This invention uses an electromagnetic attractor plate to attract iron powder falling from the screen holes during high-speed vibration of the screening rack into an inverted trapezoidal powder collection trough. The two-layer plate structure of the electromagnetic attractor plate increases the efficiency and recovery rate of iron powder screening. With the assistance of a hydraulic cylinder, the electromagnetic attractor plate is pulled from the main frame to the top of the iron powder collection trough. When the electromagnetic attractor plate is de-energized, it is shaken back and forth by the hydraulic cylinder, causing the iron powder to fall into the collection trough, thus completing the iron powder recovery operation. The device has a compact overall structure and high iron powder screening efficiency.

[0031] 3. The present invention consists of a magnetic separation equipment composed of a magnetic separation conveyor belt, a magnetic separation motor and a shaft column, which is used to perform a secondary magnetic separation operation on the slag powder conveyor belt, reducing the waste of iron powder. The iron powder on the magnetic separation conveyor belt is scraped off by the scraper installed on the top right side of the secondary separation collection box for collection and reuse, which can further improve the iron powder recovery rate. Attached Figure Description

[0032] Figure 1 This is a left-side front view of the slag and iron powder mixing and screening device in an embodiment of the present invention;

[0033] Figure 2 This is the right-side front view of the slag and iron powder mixing and screening device in an embodiment of the present invention;

[0034] Figure 3 This is a half-sectional view of the main frame of the device in an embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram showing the disassembled structure of the main frame, dual drive motors, sliding frame, screening frame and electromagnetic magnet plate in an embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of the connection structure of the dual-drive motor, sliding frame and screening frame, as well as the connection structure of the electromagnetic magnet plate and hydraulic cylinder in an embodiment of the present invention.

[0037] Figure 6 This is a side sectional view of the screening rack in an embodiment of the present invention;

[0038] Figure 7 This is a schematic diagram showing the disassembled structure of the magnetic separation conveyor belt and the secondary separation collection box in an embodiment of the present invention;

[0039] Figure 8 This is a side sectional view of the main frame structure of the slag and iron powder mixing and screening device in an embodiment of the present invention.

[0040] Figure 9 This is a flowchart of the slag and iron powder mixing and sieving method in an embodiment of the present invention.

[0041] In the diagram: 1. Main frame of the device; 101. Feeding pipe; 102. Feeding hopper; 103. Limiting chute; 104. Fixing pad; 105. Gravel discharge port; 106. Double conical roller; 107. Conveyor belt trough; 108. Iron powder collection trough; 109. Re-selection bracket; 1010. Limiting guide rod; 2. Screw conveyor; 3. Dual drive motor; 301. Drive disc; 302. Eccentric cylinder; 4. 401 Sliding trough; 5 Screening frame; 501 Connecting column head; 502 Gravel trough; 6 Electromagnetic magnet plate; 601 Powder collection trough; 602 Sliding sleeve hole; 7 Vibrating screen plate; 8 Hydraulic cylinder; 9 Screening motor; 901 Eccentric wheel; 10 Powder and slag conveyor belt; 11 Magnetic separation conveyor belt; 12 Magnetic separation motor; 13 Re-selection collection box; 1301 Scraper; 14 Shaft column. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0043] It should be noted that, depending on the implementation needs, the various steps / components described in this application can be broken down into more steps / components, or two or more steps / components or parts of the operation of steps / components can be combined into new steps / components to achieve the purpose of this invention.

[0044] Example 1: This example provides a mixing and screening device for iron slag powder used in ironmaking sintering. It uses an electromagnetic suction plate to attract iron powder falling from the screen mesh during high-speed vibration of the screening frame into an inverted trapezoidal powder collection trough. The two-layer plate structure of the electromagnetic suction plate increases the efficiency and recovery rate of iron powder screening. With the assistance of a hydraulic cylinder, the electromagnetic suction plate is pulled from the main frame of the device to the top of the iron powder collection trough. When the electromagnetic suction plate is de-energized, it is shaken back and forth by the hydraulic cylinder, causing the iron powder to fall into the iron powder collection trough, thus completing the iron powder recovery operation.

[0045] like Figures 1-8 As shown, it mainly includes: a main frame 1, a feeding hopper 102 connected to the top of the front side wall of the main frame 1 through a feeding pipe 101, a screw conveyor 2 inside the feeding pipe 101, and the feeding hopper 102 located directly below the discharge port of the crusher.

[0046] The inner middle of the main frame 1 of the device is provided with a multi-layer screening rack 5. The two sides of the multi-layer screening rack 5 are connected to the dual drive motor 3 located at the top of the main frame 1 of the device through the sliding frame 4. Under the drive of the dual drive motor 3, the multi-layer screening rack 5 is vibrating up and down with the sliding frame 4. The multi-layer electromagnetic magnet plate 6 is interleaved in the multi-layer screening rack 5. The multi-layer electromagnetic magnet plate 6 is slidably inserted in the main frame 1 of the device. The lower inner part of the main frame 1 of the device is rotatably connected to the vibrating screen plate 7. The rotating end of the vibrating screen plate 7 is connected to the screening motor 9 installed on the outer wall of the main frame 1 of the device.

[0047] The bottom of the rear side wall of the main frame 1 of the device is connected to an iron powder collection tank 108. A hydraulic cylinder 8 is fixedly installed on the outside of the rear side wall of the iron powder collection tank 108. The hydraulic cylinder 8 is connected to the multi-layer electromagnetic attracting plate 6 through a telescopic hydraulic rod to drive the electromagnetic attracting plate 6 to be inserted laterally into the main frame 1 of the device or pulled back to the top of the iron powder collection tank 108.

[0048] The main frame 1 of the device is provided with a powder and slag conveyor belt 10 at the bottom. One end of the powder and slag conveyor belt 10 is directly opposite the bottom of the vibrating screen plate 7, and the other end is provided with a magnetic separation conveyor belt 11. The end of the magnetic separation conveyor belt 11 is provided with a secondary separation collection box 13. The top of the secondary separation collection box 13 near the magnetic separation conveyor belt 11 is provided with a scraper 1301.

[0049] Furthermore, one end of the feeding pipe 101 is connected to the top of the front side wall of the main frame 1 of the device, and the other end is bent downwards at an incline and connected to the feeding funnel 102.

[0050] Furthermore, the front and rear side walls of the main frame 1 of the device are symmetrically provided with limiting grooves 103 in the vertical direction. The top of the sliding frame 4 is connected to the dual drive motor 3, and the bottom passes through the limiting groove 103 and is connected to both sides of the multi-layer screening frame 5. The dual drive motor 3 drives the multi-layer screening frame 5 to vibrate up and down along the limiting groove 103 through the sliding frame 4.

[0051] Furthermore, a fixing block 104 is installed on the inner wall of the main frame 1 of the device at a position corresponding to the height of the multi-layer electromagnetic attractor plate 6. The multi-layer electromagnetic attractor plate 6 is inserted into the main frame 1 of the device by the hydraulic cylinder 8 and then rests on the fixing block 104.

[0052] Furthermore, the multi-layer screening rack 5 includes upper and lower screening plates, each screening plate having multiple screen holes. The upper screening plate has a stepped inclined structure with the left side lower and the right side higher, and the lower screening plate has a stepped inclined structure with the left side higher and the right side lower. Furthermore, the left side of the upper screening plate and the right side of the lower screening plate are provided with a gravel groove 502.

[0053] The vibrating screen plate 7 is located directly below the lower screening plate. The rotating end of the vibrating screen plate 7 is driven by the screening motor 9 to drive the vibrating screen plate 7 to rotate up and down as a whole. The side of the vibrating screen plate 7 away from the rotating end is directly opposite the gravel discharge port 105 opened on the outer wall of the main frame 1 of the device.

[0054] Furthermore, the multi-layer electromagnetic absorbing plate 6 includes upper and lower electromagnetic absorbing plates. Each electromagnetic absorbing plate has multiple inverted trapezoidal powder collection grooves 601 at equal intervals. After the multi-layer electromagnetic absorbing plate 6 is inserted into the main frame 1 of the device, the two electromagnetic absorbing plates are located at the bottom of the two screening plates respectively, and each electromagnetic absorbing plate is connected to the power supply to generate magnetism.

[0055] Furthermore, a limiting guide rod 1010 is horizontally arranged above the iron powder collection tank 108, and a sliding sleeve hole 602 is provided on the connecting plate between the multi-layer electromagnetic attracting plate 6 and the telescopic hydraulic rod. The sliding sleeve hole 602 is slidably sleeved on the limiting guide rod 1010.

[0056] Furthermore, the bottom of the powder and slag conveyor belt 10 is provided with a plurality of double conical rollers 106, and one end of the powder and slag conveyor belt 10 is directly opposite the bottom of the vibrating screen plate 7, and the other end is provided with a secondary selection bracket 109. The magnetic separation conveyor belt 11 is installed on the secondary selection bracket 109 through a rotating shaft column 14, and the rotating shaft column 14 is connected to the magnetic separation motor 12.

[0057] Furthermore, the bottom of the main frame 1 of the device is provided with a conveyor belt through groove 107 for the powder conveyor belt 10 to pass through.

[0058] Example 2: This example provides a mixing and screening device for slag iron powder used in ironmaking sintering, comprising: a main frame 1; a feeding pipe 101 connected to the front end of the main frame 1, a screw conveyor 2 installed in the feeding pipe 101; a dual-drive motor 3 fixedly installed on the top of the main frame 1; sliding frames 4 connected to the front and rear ends of the dual-drive motor 3; a screening frame 5 slidably connected inside the main frame 1; the front and rear sides of the screening frame 5 connected to the bottom of the sliding frame 4; a vibrating screen plate 7 connected to the bottom of the screening frame 5 in the main frame 1; an electromagnetic magnet plate 6 slidably connected to the rear side wall of the main frame 1; a through-feed slag conveyor belt 10 connected to the bottom of the main frame 1; a magnetic separation conveyor belt 11 connected to the left rear end of the main frame 1; a secondary collection box 13 placed at the bottom left end of the magnetic separation conveyor belt 11; and a screening motor 9 fixedly installed at the bottom right side wall of the main frame 1.

[0059] The front end of the feeding pipe 101 is provided with a feeding funnel 102, which is installed at the bottom of the jaw crusher. The rear end of the feeding pipe 101 is bent downward and connected to the side wall of the main frame 1. The front and rear side walls of the main frame 1 are symmetrically provided with limit grooves 103. The left inner wall of the main frame 1 is symmetrically fixed with pads 104. The bottom of the main frame 1 is provided with double conical rollers 106 at equal intervals. The double conical rollers 106 are used to drive the powder conveyor belt 10. The bottom of the front and rear side walls of the main frame 1 is provided with conveyor belt through grooves 107, and the powder conveyor belt 10 passes through the conveyor belt through grooves 107.

[0060] The main frame 1 of the device is fixedly connected to the left rear side of the separation bracket 109. The front and rear ends of the separation bracket 109 are rotatably connected to the shaft column 14. The outer side of the shaft column 14 is covered by the magnetic separation conveyor belt 11. The left rear side of the separation bracket 109 is fixedly installed with the magnetic separation motor 12 connected to the shaft column 14. The separation collection box 13 is convex. The right top of the separation collection box 13 is fitted with a scraper 1301 that is attached to the outer side wall of the end of the magnetic separation conveyor belt 11.

[0061] Using the above technical solution, the feeding hopper 102 is installed at the bottom of the jaw crusher or hydraulic cone crusher to collect the crushed ironmaking waste. Then, it is conveyed to the main frame 1 of the device through the screw conveyor 2 used in the feeding pipe 101. The feeding pipe 101, which extends out of the main frame 1 and curves downward, can reduce the scattering of slag powder. The slag powder is put onto the screening frame 5. The magnetic separation conveyor belt 11, magnetic separation motor 12, and shaft column 14 connected to the right rear side of the main frame 1 form a magnetic separation device. By performing a secondary magnetic separation operation on the slag powder on the slag conveyor belt 10, the waste of iron powder is reduced. The scraper 1301 installed on the top right side of the secondary collection box 13 scrapes the iron powder off the magnetic separation conveyor belt 11 for collection and reuse.

[0062] Example 3: This example provides a mixing and screening device for iron slag powder used in ironmaking sintering. The device uses a screw conveyor 2 in the feeding pipe 101 to feed the complete slag powder. A magnetic separation conveyor belt 11, a magnetic separation motor 12, and a shaft column 14 are installed on the right rear side of the main frame 1 to form a magnetic separation device. The slag powder on the slag conveyor belt 10 undergoes a secondary magnetic separation operation to reduce the waste of iron powder. The device also includes: a drive disc 301 connected to the front and rear drive shafts of the dual drive motor 3. An eccentric cylinder 302 is connected to the outer wall of the drive disc 301. The eccentric cylinder 302 is slidably connected to a sliding groove 401 opened in the middle of the top of the inverted "∩" sliding frame 4. The bottom two ends of the sliding frame 4 are connected to the connecting column heads 501 symmetrically arranged on the front and rear side walls of the screening frame 5.

[0063] The screening rack 5 has an internal two-layer plate structure, with screen holes in both layers. The upper plate structure of the screening rack 5 is a stepped inclined structure with a lower left side and a higher right side. A gravel trough 502 is provided on the left side of the upper plate structure of the screening rack 5. The lower plate structure of the screening rack 5 is a stepped inclined structure with a higher left side and a lower right side. A gravel trough 502 is provided on the right side of the lower plate structure of the screening rack 5.

[0064] Among them, the bottom of the left side wall of the main frame 1 of the device is provided with a gravel discharge port 105. The front and rear sides of the left end of the vibrating screen plate 7 are rotatably connected to the front and rear side walls of the gravel discharge port 105. The vibrating screen plate 7 is inclined with the left side lower and the right side higher. The bottom right side of the vibrating screen plate 7 is slidably connected to the top of the eccentric wheel 901 connected to the rear drive shaft of the screening motor 9.

[0065] Using the above technical solution, the sliding frame 4 is controlled to move up and down at high speed by the drive disc 301 and eccentric cylinder 302 on the front and rear shafts of the dual drive motor 3. This causes the slag powder to vibrate at high speed through the screening frame 5 connected to the bottom of the sliding frame 4, separating the powder and lumps. The powder falls through the stepped plate-shaped screen holes of the screening frame 5, while the lumps continue to move through the lumps and gravel troughs 502 left in the upper and lower layers of the screening frame 5 and fall onto the vibrating screen plate 7. When the screening motor 9 drives the eccentric wheel 901 to rotate, causing the right end of the vibrating screen plate 7 to move up and down, the lumps are discharged from the lumps and gravel discharge port 105 of the main frame 1 of the device for re-crushing operation. This realizes the screening operation of iron powder, residue and lumps and gravel, which facilitates the recycling of iron powder, residue and lumps and gravel.

[0066] Example 4: This example provides a mixing and screening device for iron slag powder used in ironmaking sintering. The device uses a screw conveyor 2 in the feeding pipe 101 to feed the complete slag powder. A magnetic separation conveyor belt 11, a magnetic separation motor 12, and a shaft column 14 are installed on the right rear side of the main frame 1 to form a magnetic separation device. The slag powder on the slag conveyor belt 10 undergoes a secondary magnetic separation operation to reduce the waste of iron powder. The device also includes: an iron powder collection tank 108 connected to the bottom of the rear side wall of the main frame 1. The bottom of the iron powder collection tank 108 is shaped with the left side higher than the right side. Two limiting guide rods 1010 are symmetrically installed between the front and rear side walls of the top of the iron powder collection tank 108. A hydraulic cylinder 8 is fixedly installed on the top of the rear outer wall of the iron powder collection tank 108. The front telescopic end of the hydraulic cylinder 8 is connected to the middle of the rear side wall of the electromagnetic attracting plate 6.

[0067] Among them, the front side of the electromagnetic magnet plate 6 is a staggered upper and lower plate structure. These two plates can generate magnetism when energized. The two plate structures on the front side of the electromagnetic magnet plate 6 are located at the bottom of the two plate structures of the screening rack 5. The plate structure on the front side of the electromagnetic magnet plate 6 has inverted trapezoidal powder collection grooves 601 at equal intervals. The left and right ends of the side wall of the electromagnetic magnet plate 6 are symmetrically provided with sliding sleeve holes 602. The sliding sleeve holes 602 slide through the limiting guide rod 1010 at the top of the iron powder collection groove 108 of the main frame of the device 1.

[0068] Using the above technical solution, when the screening rack 5 vibrates at high speed, the powder falling from the screen holes of the screening rack 5 will contact the electromagnetic plate-like structure on the front side of the electromagnetic attractor plate 6 and adsorb the iron powder into the inverted trapezoidal powder collection tank 601 to complete the iron powder recovery operation. The electromagnetic plate-like structure on the front side of the electromagnetic attractor plate 6 has two layers, which facilitates the increase of iron powder screening and recovery efficiency and recovery rate. When the electromagnetic attractor plate 6 is pulled out from the main frame 1 of the device by the hydraulic cylinder 8 and is located at the top of the iron powder collection tank 108, the electromagnetic attractor plate 6 is de-energized, and under the back and forth shaking of the hydraulic cylinder 8, the iron powder falls into the iron powder collection tank 108, thus completing the iron powder recovery operation.

[0069] Example 5, based on the same inventive concept, also provides a method for mixing and screening slag iron powder used in ironmaking sintering, employing the mixing and screening device described above, such as... Figure 9 As shown, the specific steps include the following:

[0070] S1, Slag powder collection: The slag powder flowing out of the crusher outlet enters the feeding hopper and is transported to the top of the main frame of the device by the screw conveyor in the feeding pipe;

[0071] S2, Slag powder mixing and screening: The multi-layer screening frame vibrates vertically up and down under the drive of the dual-drive motor and the sliding frame, so that the lumps and gravel in the slag powder are separated from the powder. The separated lumps and gravel fall from the reserved lumps and gravel groove on the screening plate to the vibrating screen plate, and the lumps and gravel are discharged from the lumps and gravel discharge port opened on the side wall of the main frame of the device by the up and down rotation of the vibrating screen plate.

[0072] S3, one-time iron powder adsorption: the multi-layer electromagnetic magnetic plates are energized and inserted into the main frame of the device under the drive of the hydraulic cylinder. When the separated powder passes through the powder collection groove opened on the electromagnetic magnetic plates, the iron powder in the powder will be adsorbed in the powder collection groove. The remaining powder residue will fall onto the powder and slag conveyor belt through the vibrating screen plate.

[0073] S4, Primary iron powder collection: The multi-layer electromagnetic attracting plate is pulled back above the iron powder collection tank under the drive of the hydraulic cylinder and the power is cut off, causing the iron powder adsorbed in the collection tank to fall into the iron powder collection tank:

[0074] S5, Secondary iron powder adsorption: The powder residue conveyor belt transports the powder residue to below the magnetic separation conveyor belt, so that the remaining iron powder in the powder residue is adsorbed onto the magnetic separation conveyor belt;

[0075] S6, Secondary iron powder collection: The scraper installed on the top side of the secondary collection box scrapes the iron powder on the magnetic separation conveyor belt into the secondary collection box.

[0076] Furthermore, the feeding hopper 102 is first installed at the bottom of the jaw crusher or hydraulic cone crusher. Under the action of the screw conveyor 2, the waste residue is conveyed to the main frame 1 of the device through the feeding pipe 101. The top of the rear side of the downward-curving feeding pipe 101 in the main frame 1 of the device feeds the slag powder onto the screening frame 5. Then, the driving discs 301 and eccentric cylinders 302 on both sides of the dual drive motor 3 control the sliding frame 4 to move up and down at high speed. The screening frame 5 connected to the bottom of the sliding frame 4 then vibrates at high speed, separating the powder and the gravel. The powder falls from the stepped screen holes of the screening frame 5, while the gravel continues to roll from the gravel groove 502 left by the screening frame 5 and falls onto the vibrating screen plate 7. The eccentric wheel 901 is driven to rotate by the screening motor 9, causing the right end of the vibrating screen plate 7 to move up and down, thus separating the gravel from the main frame 1 of the device. The gravel discharge port 105 discharges the powder for re-crushing. When the screening frame 5 vibrates at high speed, the powder falling from the screen holes of the screening frame 5 will remain in the inverted trapezoidal powder collection trough 601 of the electromagnetic magnetic plate 6. After a period of time, the hydraulic cylinder 8 pulls the electromagnetic magnetic plate 6 out of the main frame 1 of the device. When it is at the top of the iron powder collection trough 108, the electromagnetic magnetic plate 6 is de-energized. The hydraulic cylinder 8 controls the electromagnetic magnetic plate 6 to swing back and forth, so that the iron powder falls into the iron powder collection trough 108, completing the iron powder recycling operation. When the residue is conveyed backward, the magnetic separation conveyor belt 11, magnetic separation motor 12 and shaft column 14 connected to the right rear side of the main frame 1 of the device form a magnetic separation device to perform a second magnetic separation operation on the slag powder of the powder conveyor belt 10, reducing the waste of iron powder. The iron powder on the magnetic separation conveyor belt 11 is scraped off by the scraper 1301 installed on the top right side of the secondary separation collection box 13.

[0077] Furthermore, all parts of this application that are not described in detail are the same as or implemented using existing technology.

[0078] In summary:

[0079] 1. This invention uses a dual-drive motor and a sliding frame to control the screening frame connected to the bottom of the sliding frame to vibrate at high speed, so as to separate powder and gravel. The powder falls through the stepped screen holes of the screening frame, while the gravel rolls from the gravel groove left by the screening frame and falls onto the vibrating screen plate. The screening motor controls the right end of the vibrating screen plate to move up and down, so as to discharge the gravel from the gravel discharge port of the main frame of the device. This facilitates the screening operation of iron powder, residue and gravel, so as to classify and recycle iron powder, residue and gravel.

[0080] 2. This invention uses an electromagnetic attractor plate to attract iron powder falling from the screen holes during high-speed vibration of the screening rack into an inverted trapezoidal powder collection trough. The two-layer plate structure of the electromagnetic attractor plate increases the efficiency and recovery rate of iron powder screening. With the assistance of a hydraulic cylinder, the electromagnetic attractor plate is pulled from the main frame to the top of the iron powder collection trough. When the electromagnetic attractor plate is de-energized, it is shaken back and forth by the hydraulic cylinder, causing the iron powder to fall into the collection trough, thus completing the iron powder recovery operation. The device has a compact overall structure and high iron powder screening efficiency.

[0081] 3. The present invention consists of a magnetic separation equipment composed of a magnetic separation conveyor belt, a magnetic separation motor and a shaft column, which is used to perform a secondary magnetic separation operation on the slag powder conveyor belt, reducing the waste of iron powder. The iron powder on the magnetic separation conveyor belt is scraped off by the scraper installed on the top right side of the secondary separation collection box for collection and reuse, which can further improve the iron powder recovery rate.

[0082] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A mixing and screening device for slag and iron powder used in ironmaking sintering, characterized in that, The device includes a main frame (1), and a feeding hopper (102) is connected to the top of the front side wall of the main frame (1) through a feeding pipe (101). A screw conveyor (2) is provided inside the feeding pipe (101), and the feeding hopper (102) is located directly below the outlet of the crusher. The device main frame (1) has a multi-layer screening rack (5) in the middle of its inner side. The multi-layer screening rack (5) is connected to the dual drive motor (3) at the top of the device main frame (1) through the sliding frame (4) on both sides and vibrates up and down with the sliding frame (4) under the drive of the dual drive motor (3). The multi-layer screening rack (5) is interleaved with multiple electromagnetic magnet plates (6). The multi-layer electromagnetic magnet plates (6) are slidably inserted in the device main frame (1). The device main frame (1) has a vibrating screen plate (7) rotatably connected to the lower inner side of the device main frame (1). The rotating end of the vibrating screen plate (7) is connected to the screening motor (9) installed on the outer wall of the device main frame (1). The bottom of the rear side wall of the main frame (1) of the device is connected to an iron powder collection tank (108). A hydraulic cylinder (8) is fixedly installed on the outside of the rear side wall of the iron powder collection tank (108). The hydraulic cylinder (8) is connected to the multi-layer electromagnetic magnet plate (6) through a telescopic hydraulic rod to drive the electromagnetic magnet plate (6) to be inserted laterally into the main frame (1) of the device or pulled back to the top of the iron powder collection tank (108). The main frame (1) of the device is provided with a powder and slag conveyor belt (10) at the bottom. One end of the powder and slag conveyor belt (10) is directly opposite the bottom of the vibrating screen plate (7), and the other end is provided with a magnetic separation conveyor belt (11). The end of the magnetic separation conveyor belt (11) is provided with a secondary separation collection box (13). The top of the secondary separation collection box (13) near the magnetic separation conveyor belt (11) is provided with a scraper (1301). The multi-layer screening rack (5) includes two screening plates, upper and lower. Each screening plate has multiple screen holes. The upper screening plate has a stepped inclined structure with the left side lower and the right side higher, and the lower screening plate has a stepped inclined structure with the left side higher and the right side lower. The upper screening plate and the lower screening plate are provided with a gravel trough (502) on the left side and the lower screening plate respectively. The vibrating screen plate (7) is located directly below the lower screening plate. The rotating end of the vibrating screen plate (7) is driven by the screening motor (9) to drive the vibrating screen plate (7) to rotate up and down as a whole. The side of the vibrating screen plate (7) away from the rotating end is directly opposite the gravel discharge port (105) opened on the outer wall of the main frame (1) of the device. The multi-layer electromagnetic wicking plate (6) includes two layers of electromagnetic wicking plates, and each layer of electromagnetic wicking plate has multiple inverted trapezoidal powder collection grooves (601) at equal intervals. After the multi-layer electromagnetic wicking plate (6) is inserted into the main frame (1) of the device, the two layers of electromagnetic wicking plates are located at the bottom of the two screening plates respectively, and each layer of electromagnetic wicking plate is connected to the power supply to generate magnetism.

2. The mixing and screening device for slag and iron powder used in ironmaking sintering according to claim 1, characterized in that, One end of the feeding pipe (101) is connected to the top of the front side wall of the main frame (1) of the device, and the other end is bent downwards at an incline and connected to the feeding funnel (102).

3. The mixing and screening device for slag and iron powder used in ironmaking sintering according to claim 1, characterized in that, The device's main frame (1) has symmetrically arranged limiting grooves (103) in the middle of its front and rear side walls along the vertical direction. The top of the sliding frame (4) is connected to the dual drive motor (3), and the bottom passes through the limiting groove (103) and is connected to both sides of the multi-layer screening rack (5). The dual drive motor (3) drives the multi-layer screening rack (5) to vibrate up and down along the limiting groove (103) through the sliding frame (4).

4. The mixing and screening device for slag and iron powder used in ironmaking sintering according to claim 1, characterized in that, A fixing pad (104) is installed on the inner wall of the main frame (1) of the device at a position corresponding to the height of the multi-layer electromagnetic wicking plate (6). The multi-layer electromagnetic wicking plate (6) is driven by the hydraulic cylinder (8) to be inserted into the main frame (1) of the device and then placed on the fixing pad (104).

5. The mixing and screening device for slag and iron powder used in ironmaking sintering according to claim 4, characterized in that, A limiting guide rod (1010) is horizontally arranged above the iron powder collection tank (108). A sliding sleeve hole (602) is provided on the connecting plate between the multi-layer electromagnetic iron-attracting plate (6) and the telescopic hydraulic rod. The sliding sleeve hole (602) is slidably sleeved on the limiting guide rod (1010).

6. The mixing and screening device for slag and iron powder used in ironmaking sintering according to claim 1, characterized in that, The bottom of the powder conveyor belt (10) is provided with multiple double conical rollers (106), and one end of the powder conveyor belt (10) is directly opposite the bottom of the vibrating screen plate (7), and the other end is provided with a secondary selection bracket (109). The magnetic separation conveyor belt (11) is installed on the secondary selection bracket (109) through a rotating shaft column (14), and the rotating shaft column (14) is connected to the magnetic separation motor (12).

7. The mixing and screening device for slag and iron powder used in ironmaking sintering according to claim 6, characterized in that, The bottom of the main frame (1) of the device is provided with a conveyor belt through groove (107) for the slag conveyor belt (10) to pass through.

8. A method for mixing and screening slag iron powder used in ironmaking sintering, comprising using the mixing and screening device as described in any one of claims 1 to 7, characterized in that, Includes the following steps: S1, Slag powder collection: The slag powder flowing out of the crusher outlet enters the feeding hopper and is transported to the top of the main frame of the device by the screw conveyor in the feeding pipe; S2, Slag powder mixing and screening: The multi-layer screening frame vibrates vertically up and down under the drive of the dual-drive motor and the sliding frame, so that the lumps and gravel in the slag powder are separated from the powder. The separated lumps and gravel fall from the reserved lumps and gravel groove on the screening plate to the vibrating screen plate, and the lumps and gravel are discharged from the lumps and gravel discharge port opened on the side wall of the main frame of the device by the up and down rotation of the vibrating screen plate. S3, one-time iron powder adsorption: the multi-layer electromagnetic magnetic plates are energized and inserted into the main frame of the device under the drive of the hydraulic cylinder. When the separated powder passes through the powder collection groove opened on the electromagnetic magnetic plates, the iron powder in the powder will be adsorbed in the powder collection groove. The remaining powder residue will fall onto the powder and slag conveyor belt through the vibrating screen plate. S4, Primary iron powder collection: The multi-layer electromagnetic attracting plate is pulled back above the iron powder collection tank under the drive of the hydraulic cylinder and the power is cut off, causing the iron powder adsorbed in the collection tank to fall into the iron powder collection tank: S5, Secondary iron powder adsorption: The powder residue conveyor belt transports the powder residue to below the magnetic separation conveyor belt, so that the remaining iron powder in the powder residue is adsorbed onto the magnetic separation conveyor belt; S6, Secondary iron powder collection: The scraper installed on the top side of the secondary collection box scrapes the iron powder on the magnetic separation conveyor belt into the secondary collection box.

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