A slag powder raw material screening and impurity removing device

Abstract

The utility model discloses a kind of slag micro-powder raw material screening and impurity removing devices, including iron removal box and screening box, iron removal box is provided with belt conveyor in, the top of belt conveyor is provided with permanent magnet plate, annular conveyer belt is sleeved on permanent magnet plate, the both ends of conveyer belt are provided with annular rack, the side wall of iron removal box on permanent magnet plate side is provided with scraper, the end of scraper is close to conveyer belt surface, the below of scraper end is provided with the conveyer belt that extends to the outside of iron removal box, the lower end of discharge pipe is connected with throwing material cylinder after being inserted into screening box, rotating shaft is provided in throwing material cylinder, throwing material plate is provided on rotating shaft, throwing material pipe is provided on throwing material cylinder tangentially and obliquely upwards, blowing mechanism is provided above throwing material pipe, impurity outlet is provided at the bottom of screening box away from blowing mechanism, material outlet is provided at the bottom of screening box close to blowing mechanism. Above all, the utility model has the advantages of efficient iron removal, complete lightweight impurity screening, and good impurity removal effect.

Description

Technical Field

[0001] This utility model relates to the field of screening and impurity removal technology for slag powder raw materials, specifically to a screening and impurity removal device for slag powder raw materials. Background Technology

[0002] The main uses of slag powder are in cement and as an additive in ready-mixed concrete. Its utilization methods vary, but can be broadly categorized into three forms: admixture, additive, and primary admixture. Its main function is to improve the early strength of cement and concrete and enhance certain concrete properties. Slag powder is typically made from blast furnace slag or steel slag, but it often contains hard metal impurities such as iron parts and steel balls, which can damage expensive vertical mills or roller presses. It also contains combustible lightweight impurities such as plastics, wood, and fibers, affecting the chemical composition, material properties, and color of the slag powder and reducing its quality. Therefore, effective screening and impurity removal are essential before grinding slag into high-value-added powder to ensure the stable operation of the mill system and the quality of the final product.

[0003] Currently, the following problems exist in the screening and impurity removal of slag powder raw materials: First, iron removal is the key to impurity removal. Magnetic plates are typically used to adsorb and clean ferromagnetic impurities in the slag powder raw materials on the conveyor belt. However, when a large amount of ferromagnetic impurities are adsorbed onto the magnetic plates, the impurities obstruct the process, reducing the iron removal efficiency of the device. Second, when screening for lightweight impurities such as wood, incomplete screening often occurs, resulting in the slag powder still containing a certain amount of lightweight impurities. Therefore, it is objectively necessary to develop a slag powder raw material screening and impurity removal device that can efficiently remove iron, thoroughly screen for lightweight impurities, and achieve good impurity removal results. Utility Model Content

[0004] The purpose of this invention is to provide a slag powder raw material screening and impurity removal device that can efficiently remove iron, thoroughly screen light impurities, and achieve good impurity removal effect.

[0005] The purpose of this utility model is achieved as follows: It includes an iron removal box and a screening box. An inlet pipe and an outlet pipe are respectively arranged on opposite sides of the iron removal box. A belt conveyor is installed inside the iron removal box between the inlet pipe and the outlet pipe. A permanent magnet plate is installed above the belt conveyor. The two sides of the permanent magnet plate are arc-shaped. An annular conveyor belt is fitted onto the permanent magnet plate. Ring-shaped racks are installed at both ends of the conveyor belt. A drive mechanism for driving the ring-shaped racks to rotate is installed on the top of the iron removal box. A scraper is installed on the side wall of the iron removal box on one side of the permanent magnet plate. The end of the scraper is in close contact with the surface of the conveyor belt. A conveyor belt extending out of the iron removal box is installed below the end of the scraper. The lower end of the outlet pipe extends into the screening box and is connected to a throwing cylinder. A rotating shaft is installed inside the throwing cylinder, and a throwing plate is installed on the rotating shaft. A throwing pipe is tangentially inclined upward on the throwing cylinder. A blower mechanism is installed above the throwing pipe. An impurity outlet is installed at the bottom of the screening box away from the blower mechanism, and a material outlet is installed at the bottom of the screening box close to the blower mechanism.

[0006] Furthermore, the blower assembly includes a blower and a distribution plate. The blower is installed on the outer wall of the screening box, and the blower's outlet pipe extends into the screening box and connects with the distribution plate.

[0007] Furthermore, a baffle plate is installed between the impurity outlet and the material outlet. A material passage is left between the upper end of the baffle plate and the top of the screening box, and the lower end of the baffle plate is connected to the bottom of the screening box.

[0008] Furthermore, an air outlet is provided on the side wall of the screening box near the impurity outlet, and a filter screen is installed inside the air outlet.

[0009] Furthermore, a metal detector is installed above the belt conveyor, located on the side near the discharge pipe. A guide plate is rotatably connected to the side wall of the iron removal box above the discharge pipe, and a discharge port is provided on the side wall of the iron removal box above the guide plate.

[0010] Furthermore, a coarse filtration mechanism is inclinedly installed inside the iron removal box below the feed pipe. The coarse filtration mechanism includes an annular frame and several parallel thin rods arranged at intervals inside the annular frame. The higher end of the annular frame is suspended in the air, and the lower end is connected to the iron removal box. A block material discharge port is provided on the side wall of the iron removal box above the lower end of the annular frame.

[0011] Furthermore, the end of the scraper is hinged to the iron removal box, and a spring is provided between the middle of the scraper and the side wall of the iron removal box.

[0012] Furthermore, the permanent magnet plate has non-magnetic sections at both ends, and the annular rack is located in the non-magnetic section.

[0013] This invention is used for screening and removing impurities from slag powder raw materials. During operation, the slag is poured into a belt conveyor inside the iron removal box through a feed pipe. The belt conveyor moves the slag. When the slag reaches below the permanent magnet plate, ferromagnetic impurities such as iron blocks are attracted by the permanent magnet plate and separated from the slag, adsorbing onto the conveyor belt. Simultaneously, the drive mechanism drives a ring rack to move on the surface of the permanent magnet plate. Since the ring rack is set on the conveyor belt, when the ring rack moves, it drives the conveyor belt to move, thereby causing the conveyor belt to rotate on the surface of the permanent magnet plate, which in turn drives the ferromagnetic impurities adsorbed on the conveyor belt. The material moves synchronously. When ferromagnetic impurities reach the scraper position, they are scraped off the conveyor belt and fall onto the conveyor belt below. The conveyor belt then transports the slag out of the iron removal box. The slag, now free of ferromagnetic impurities, continues to move forward and falls from the discharge pipe into the throwing cylinder of the screening box. Simultaneously, the rotating shaft drives the throwing plate to rotate, tilting and throwing the slag upward from the throwing pipe. The blower blows air into the slag in the air. Lightweight impurities such as wood and plastic are separated from the slag by the wind and move forward a distance under the influence of the wind, exiting from the impurity outlet. The slag, on the other hand, is discharged from the material outlet. In this invention, a permanent magnet plate is used to adsorb and separate ferromagnetic impurities from slag. During the adsorption process, the conveyor belt moves continuously, carrying the ferromagnetic impurities with it. The impurities are then scraped off by a scraper. This fundamentally solves the problem of magnetic plates adsorbing large amounts of ferromagnetic impurities during traditional iron removal processes. The permanent magnet plate maintains good adsorption capacity within its adsorption area, eliminating the problem of excessive adsorption of ferromagnetic impurities causing obstruction and affecting adsorption capacity, thus improving the iron removal effect of the device. Simultaneously, the adsorbed ferromagnetic impurities can be automatically cleaned online without affecting the normal operation of the device or requiring shutdown, improving its working efficiency. Secondly, when screening light impurities in slag, compared to the traditional method of wind separation during slag fall, this device uses a throwing plate to throw the slag up. The slag is more dispersed when thrown, and after being thrown, it moves upward a certain distance before falling downward, allowing for more thorough wind screening. This ensures that the light impurities are completely separated from the slag, resulting in more thorough screening, better screening effect, and improved slag purity. In summary, this utility model has the advantages of efficient iron removal, thorough screening of light impurities, and good impurity removal effect. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of AA; Figure 3 This is a top view of the coarse filter mechanism in this utility model. In the diagram: 1-Iron removal box, 2-Screening box, 3-Belt conveyor, 4-Permanent magnet plate, 5-Conveyor belt, 6-Ring rack and pinion, 7-Scraper, 8-Conveyor belt, 9-Throwing cylinder, 10-Throwing plate, 11-Throwing pipe, 12-Impurity outlet, 13-Material outlet, 14-Blower, 15-Air distribution plate, 16-Baffle plate, 17-Filter screen, 18-Metal detector, 19-Guide plate, 20-Discharge port, 21-Ring frame, 22-Thin rod, 23-Spring, 24-Non-magnetic part. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings, but this description is not intended to limit the present invention in any way. Any changes or improvements made based on the present invention shall fall within the protection scope of the present invention.

[0016] like Figures 1-3 As shown, this utility model includes an iron removal box 1 and a screening box 2. The iron removal box 1 is mainly used to remove iron impurities from slag, and the screening box 2 is mainly used to remove light impurities such as wood and plastic from slag. An inlet pipe and an outlet pipe are respectively provided on opposite sides of the iron removal box 1. The slag enters the iron removal box 1 through the inlet pipe and is discharged through the outlet pipe after iron removal. A belt conveyor 3 is installed inside the iron removal box 1 between the inlet pipe and the outlet pipe. The belt conveyor 3 is existing equipment used to drive the slag forward for transport and movement. A permanent magnet plate 4 is installed above the belt conveyor 3. The permanent magnet plate 4 is an existing structure with strong magnetism. The two sides of the permanent magnet plate 4 are arc-shaped, which reduces the friction between the ends of the permanent magnet plate 4 and the conveyor belt 5. A ring-shaped conveyor belt 5 is fitted onto the permanent magnet plate 4, wrapping around the permanent magnet plate 4 in a ring shape. Ring-shaped racks 6 are provided at both ends of the conveyor belt 5. A drive mechanism for driving the ring-shaped racks 6 to rotate is installed on the top of the iron removal box 1. The drive mechanism is existing technology and generally includes... The drive motor and the drive gear connected to the drive motor are connected in a transmission. The drive gear meshes with the ring rack 6. In use, the drive motor drives the drive gear to rotate, the drive gear drives the ring rack 6 to rotate, and the ring rack 6 drives the conveyor belt 5 to rotate. A scraper 7 is provided on the side wall of the iron removal box 1 on one side of the permanent magnet plate 4. The end of the scraper 7 is in close contact with the surface of the conveyor belt 5. A conveyor belt 8 extending out of the iron removal box 1 is provided below the end of the scraper 7. The lower end of the discharge pipe extends into the screening box 2 and is connected to the throwing cylinder 9. A rotating shaft is provided in the throwing cylinder 9, and a throwing plate 10 is provided on the rotating shaft. A throwing pipe 11 is tangentially inclined upward on the throwing cylinder 9. A blower mechanism is provided above the throwing pipe 11. The blower mechanism is an existing blowing structure used to blow air above the throwing pipe 11 to separate light impurities from the slag. The wind force is determined by actual needs. An impurity outlet 12 is provided at the bottom of the screening box 2 away from the blower mechanism, and a material outlet 13 is provided at the bottom of the screening box 2 close to the blower mechanism.

[0017] This invention is used for screening and removing impurities from slag powder raw materials. During operation, the slag is poured into the belt conveyor 3 inside the iron removal box 1 through the feed pipe. The belt conveyor 3 drives the slag to move. When the slag moves to below the permanent magnet plate 4, the ferromagnetic impurities such as iron blocks are separated from the slag by the attraction of the permanent magnet plate 4 and adsorbed onto the conveyor belt 5. At the same time, the drive mechanism drives the annular rack 6 to move on the surface of the permanent magnet plate 4. Since the annular rack 6 is set on the conveyor belt 5, when the annular rack 6 moves, it drives the conveyor belt 5 to move, thereby causing the conveyor belt 5 to rotate on the surface of the permanent magnet plate 4. This causes the ferromagnetic impurities adsorbed on the conveyor belt 4 to move synchronously. When the ferromagnetic impurities move to the scraper 7 position, they are scraped off the conveyor belt 4 and fall onto the conveyor belt 8 below. The conveyor belt 8 then transports them out of the iron removal box 1. The slag, now free of ferromagnetic impurities, continues to move forward and falls from the discharge pipe into the throwing cylinder 9 of the screening box 2. At the same time, the rotating shaft drives the throwing plate 10 to rotate, throwing the slag upwards from the throwing pipe 11. The blower blows air onto the slag in the air. Light impurities such as wood and plastic are separated from the slag by the wind and move forward a distance under the influence of the wind, then are discharged from the impurity outlet 12. The slag, being heavier, moves forward a shorter distance and is discharged from the material outlet 13.

[0018] In this invention, a permanent magnet plate 4 is used to adsorb and separate ferromagnetic impurities from slag. During the adsorption process, the conveyor belt 5 continuously moves, carrying the ferromagnetic impurities along with the plate. The scraper 7 then scrapes the impurities off. This fundamentally solves the problem of the permanent magnet plate 4 adsorbing a large amount of ferromagnetic impurities during traditional iron removal processes. This ensures that the adsorption area of ​​the permanent magnet plate 4 always maintains good adsorption capacity, eliminating the problem of excessive adsorption of ferromagnetic impurities causing obstruction and affecting adsorption capacity, thus improving the iron removal effect of the device. Simultaneously, the adsorbed ferromagnetic impurities can be automatically cleaned online. Firstly, the cleaning process does not affect the normal operation of the device and does not require shutdown, thus improving the device's working efficiency. Secondly, when screening light impurities in slag, compared to the traditional method of wind separation during the slag's fall, this device uses a throwing plate 10 to throw the slag up. The slag is more dispersed when thrown, and after being thrown, it moves upward a certain distance before falling downward, allowing the slag to be screened more thoroughly by the wind. This enables the light impurities to be completely separated from the slag, resulting in more thorough screening, better screening effect, and improved slag purity.

[0019] The blower mechanism includes a blower 14 and an air distribution plate 15. The blower 14 is installed on the outer wall of the screening box 2, and the air outlet pipe of the blower 14 extends into the screening box 2 and connects with the air distribution plate 15. The blower 14 generates airflow to the air distribution plate 15. The air distribution plate 15 is an existing structure used for uniform air distribution. In specific implementations, other types of blower mechanisms can also be selected to facilitate the separation of light impurities from the slag.

[0020] A baffle plate 16 is provided between the impurity outlet 12 and the material outlet 13. A material passage is left between the upper end of the baffle plate 16 and the top of the screening box 2, and the lower end of the baffle plate 16 is connected to the bottom of the screening box 2. In actual use, it was found that there is a certain amount of mixing between the separated light impurities and slag, which reduces the impurity removal effect. However, by setting the baffle plate 16, the light impurities and slag can be separated more thoroughly, thereby improving the impurity removal effect.

[0021] An air outlet is provided on the side wall of the screening box 2 near the impurity outlet 12. A filter screen 17 is installed inside the air outlet. In order to maintain the air pressure balance inside the device, an air outlet is required to discharge excess gas from the air outlet. At the same time, in order to prevent light impurities from being mixed in with the airflow and discharged from the air outlet, the filter screen 17 is provided so that light impurities can be separated from the airflow and fall out of the impurity outlet 12.

[0022] A metal detector 18 is installed above the belt conveyor 3. The metal detector 18 is located on the side near the discharge pipe. A guide plate 19 is rotatably connected to the side wall of the iron removal box 1 above the discharge pipe. A discharge port 20 is provided on the side wall of the iron removal box 1 above the guide plate 19. The metal detector 18 is an existing instrument used to detect whether there are metal substances in the slag. The use of the metal detector 18 in this utility model has two functions: First, the permanent magnet plate 4 can only remove ferromagnetic impurities in the slag, but the slag often contains other metal impurities such as calcium, silicon, and aluminum. These metal impurities cannot be removed by the permanent magnet plate 4, and the metal detector 18 is used to detect these metal impurities. Second, the metal detector 18 is used to detect all metal substances, including iron. Therefore, if the permanent magnet plate 4 cannot completely separate the iron impurities in the material, these iron impurities can still be detected by the metal detector 18. When the metal detector 18 does not detect any metal impurities, the guide plate 19 rotates to press against the side wall of the iron removal box 1 and remain vertical, blocking the discharge port 20. The slag, after the separation of iron impurities, falls into the discharge pipe and is discharged. When the metal detector 18 detects metal impurities, the guide plate 19 is rotated at an appropriate time according to the distance between the detection position and the guide plate 19 and the conveying speed of the belt conveyor 3. The end of the guide plate 19 is then pressed against the discharge end of the belt conveyor 3, and a small amount of slag containing metal impurities is discharged out of the iron removal box 1. The guide plate 19 is then reset so that the slag falls normally. When metal impurities are detected again, the guide plate 19 is rotated again to discharge the portion of slag containing metal impurities.

[0023] A coarse filtration mechanism is inclinedly installed inside the iron removal box 1 below the feed pipe. The coarse filtration mechanism includes an annular frame 21 and several parallel and spaced thin rods 22 arranged inside the annular frame 21. The higher end of the annular frame 21 is suspended, and the lower end is connected to the iron removal box 1. A block material discharge port is provided on the side wall of the iron removal box 1 above the lower end of the annular frame 21. According to actual use, there may be a small amount of large-volume material in the slag, which will affect the subsequent iron removal and screening work. In order to prevent this situation, a coarse filtration mechanism is set up to separate these large-volume materials first. In this utility model, a coarse filtration mechanism is set up. When the slag powder raw material falls onto the coarse filtration mechanism, it is screened by the thin rods 22. Only the material with a block diameter smaller than the distance between two adjacent thin rods 22 can continue to fall, while the large-volume material that cannot pass through the pores will slide down along the thin rods 22 and then be discharged from the block material discharge port for unified treatment.

[0024] The end of the scraper 7 is hinged to the iron removal box 1, and a spring 23 is provided between the middle of the scraper 7 and the side wall of the iron removal box 1. The scraper 7 is used to scrape off ferromagnetic impurities adsorbed on the conveyor belt 5. As the usage time increases, the end of the scraper 7 may wear or deform, making it impossible for the end of the scraper 7 to stick tightly to the conveyor belt 5, resulting in incomplete cleaning of ferromagnetic impurities and affecting the cleaning effect of subsequent ferromagnetic impurities. In order to improve this problem, the spring 23 is provided so that the spring 23 is in a compressed state and has a tendency to return to its original position and extend. Even if the scraper 7 has a certain wear and deformation, it can still press the scraper 7 onto the conveyor belt 5 to ensure the cleaning effect of ferromagnetic impurities on the conveyor belt 5.

[0025] The permanent magnet plate 4 has non-magnetic portions 24 at both ends, and the annular rack 6 is located in the non-magnetic portion 24. In practical use, it was found that because the entire area of ​​the permanent magnet plate 4 is magnetic, and the area where the annular rack 6 is located is also magnetic, some ferromagnetic impurities will be attracted to the annular rack 6. Since the drive mechanism uses gears meshing with the annular rack 6 to move it, and the surface of the annular rack 6 is covered with ferromagnetic impurities, these impurities will affect the meshing between the annular rack 6 and the gears, which is detrimental to the long-term normal operation of the device. Therefore, the non-magnetic portion 24 is provided. The non-magnetic portion 24 is made of a non-ferromagnetic material and does not attract ferromagnetic impurities. By placing the annular rack 6 in the non-magnetic portion 24, ferromagnetic impurities will not be attracted to the annular rack 6, ensuring good meshing between the annular rack 6 and the gears, thereby guaranteeing the long-term normal operation of the device.

Claims

1. A slag powder raw material screening and impurity removal device, comprising an iron removal box (1) and a screening box (2), characterized in that: The iron removal box (1) is provided with a feed pipe and a discharge pipe on opposite sides. A belt conveyor (3) is provided inside the iron removal box (1) between the feed pipe and the discharge pipe. A permanent magnet plate (4) is provided above the belt conveyor (3). The permanent magnet plate (4) has arc-shaped sides. A ring conveyor belt (5) is fitted on the permanent magnet plate (4). Ring racks (6) are provided at both ends of the conveyor belt (5). A drive mechanism for driving the ring racks (6) to rotate is installed on the top of the iron removal box (1). A scraper (7) is provided on the side wall of the iron removal box (1) on one side of the permanent magnet plate (4). The end of the scraper (7) is closely attached to the surface of the conveyor belt (5). Below the end of the scraper (7) is a conveyor belt (8) extending out of the iron box (1). The lower end of the discharge pipe extends into the screening box (2) and is connected to the throwing cylinder (9). A rotating shaft is provided inside the throwing cylinder (9). A throwing plate (10) is provided on the rotating shaft. A throwing pipe (11) is tangentially inclined upward on the throwing cylinder (9). A blower mechanism is provided above the throwing pipe (11). An impurity outlet (12) is provided at the bottom of the screening box (2) away from the blower mechanism. A material outlet (13) is provided at the bottom of the screening box (2) close to the blower mechanism.

2. The slag powder raw material screening and impurity removal device according to claim 1, characterized in that: The blower assembly includes a blower (14) and a distribution plate (15). The blower (14) is installed on the outer wall of the screening box (2). The air outlet pipe of the blower (14) extends into the screening box (2) and is connected to the distribution plate (15).

3. The slag powder raw material screening and impurity removal device according to claim 1, characterized in that: A baffle plate (16) is provided between the impurity outlet (12) and the material outlet (13). A material passage is left between the upper end of the baffle plate (16) and the top of the screening box (2). The lower end of the baffle plate (16) is connected to the bottom of the screening box (2).

4. The slag powder raw material screening and impurity removal device according to claim 1, characterized in that: An air outlet is provided on the side wall of the screening box (2) near the impurity outlet (12), and a filter screen (17) is provided inside the air outlet.

5. The slag powder raw material screening and impurity removal device according to claim 1, characterized in that: A metal detector (18) is installed above the belt conveyor (3). The metal detector (18) is located on the side close to the discharge pipe. A guide plate (19) is rotatably connected to the side wall of the iron removal box (1) above the discharge pipe. A discharge port (20) is installed on the side wall of the iron removal box (1) above the guide plate (19).

6. The slag powder raw material screening and impurity removal device according to claim 1, characterized in that: A coarse filtration mechanism is inclinedly arranged inside the iron removal box (1) below the feed pipe. The coarse filtration mechanism includes an annular frame (21) and several parallel thin rods (22) arranged at intervals inside the annular frame (21). The higher end of the annular frame (21) is suspended, and the lower end is connected to the iron removal box (1). A block material discharge port is provided on the side wall of the iron removal box (1) above the lower end of the annular frame (21).

7. The slag powder raw material screening and impurity removal device according to claim 1, characterized in that: The end of the scraper (7) is hinged to the iron removal box (1), and a spring (23) is provided between the middle part of the scraper (7) and the side wall of the iron removal box (1).

8. The slag powder raw material screening and impurity removal device according to claim 1, characterized in that: The permanent magnet plate (4) has non-magnetic parts (24) at both ends, and the annular rack (6) is located in the non-magnetic part (24).

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