Screening device for extracting iron minerals in iron tailings

Abstract

The utility model provides a screening device for extracting iron minerals in iron tailings, which relates to the technical field of ore resource utilization and comprises a rack, a feeding mechanism is arranged at the top of the rack and provided with a feeding port, a discharging port is arranged at the bottom of the rack, a magnetic separation mechanism and a material collecting mechanism are arranged in the rack, and the magnetic separation mechanism comprises a plurality of magnetic separation rollers. The multiple magnetic separation rollers are sequentially arranged between the feeding port and the discharging port, a material guide plate is arranged between every two adjacent magnetic separation rollers, and the magnetic field intensities of the multiple magnetic separation rollers are sequentially increased in the direction of the material conveying channel; the material collecting mechanism is arranged below the magnetic separation mechanism and provided with a plurality of partition plates, the material collecting mechanism is divided into a plurality of material collecting hoppers, and the multiple material collecting hoppers are arranged below the multiple magnetic separation rollers in a one-to-one correspondence mode. According to the utility model, the plurality of magnetic separation rollers are arranged and different magnetic field intensities are set, so that graded adsorption and classified management of different iron contents in iron tailings are realized, and efficient utilization of resources is realized.

Description

Technical Field

[0001] This utility model relates to the field of mineral resource utilization technology, and in particular to a screening device for extracting iron minerals from iron tailings. Background Technology

[0002] In the beneficiation and smelting of iron ore, processes such as magnetic separation, flotation, and gravity separation are typically used to obtain high-grade iron concentrate. However, regardless of the beneficiation method, a certain amount of iron tailings is generated. Although iron tailings mostly consist of gangue minerals and impurities, they still contain a certain amount of iron minerals, some of which have high recovery value. Due to the complexity of the beneficiation process and economic considerations, the iron resources in a large amount of iron tailings are not fully utilized, resulting in resource waste and environmental pressure.

[0003] Iron tailings contain minerals with varying iron content, each with different uses. High-iron-content minerals can often be directly used as raw materials for iron smelting after simple processing, thus reintegrating into the steel production chain. Low-iron-content minerals, on the other hand, can be used to prepare building materials, road paving, or as raw materials for magnetic materials. However, under current technological conditions, the classification and targeted recycling of these minerals with different iron contents have not been effectively implemented.

[0004] Traditional iron tailings recovery technologies mostly employ single magnetic separation or flotation processes to maximize iron ore recovery rates, but rarely focus on the classification of recovered minerals. Due to the lack of effective classification and recovery methods, minerals with low iron content are often stockpiled or discarded along with other impurities, while minerals with high iron content may be mixed with impurities due to the limitations of the recovery methods, leading to a decline in quality. This indiscriminate recovery approach not only limits the application scope of iron tailings but also increases the cost and difficulty of subsequent processing. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, the technical problem to be solved by this utility model is to propose a screening device for extracting iron minerals from iron tailings, and the following technical solution is adopted:

[0006] A screening device for extracting iron minerals from iron tailings includes a frame, a feeding mechanism with a feed inlet at the top of the frame, a discharge outlet at the bottom of the frame, and a magnetic separation mechanism and a collecting mechanism inside. The magnetic separation mechanism includes multiple magnetic separation rollers, which are sequentially arranged between the feed inlet and the discharge outlet. A guide plate is provided between two adjacent magnetic separation rollers to form a conveying channel. The magnetic field strength of the multiple magnetic separation rollers increases sequentially along the conveying channel.

[0007] A scraper is provided on the lower side of the magnetic separation roller, which is used to scrape off iron minerals from the surface of the magnetic separation roller; the collecting mechanism is provided below the magnetic separation mechanism and is provided with multiple partitions to divide it into multiple collecting hoppers, and the multiple collecting hoppers are arranged one-to-one below the multiple magnetic separation rollers.

[0008] Further improvements include a first magnetic separation roller, a second magnetic separation roller, and a third magnetic separation roller, wherein the magnetic field strength of the first magnetic separation roller is 2000 Gs to 3000 Gs, the magnetic field strength of the second magnetic separation roller is 4000 Gs to 6000 Gs, and the magnetic field strength of the third magnetic separation roller is 8000 Gs to 10000 Gs.

[0009] As a further improvement, the magnetic separator roller is provided with a magnetic system assembly inside, and the wrap angle of the magnetic system assembly is 90° to 270°.

[0010] As a further improvement, the aforementioned magnetic separation roller is a permanent magnet roller or an electromagnetic drum.

[0011] As a further improvement, a bracket is provided on the roller shaft of the magnetic separation roller, the scraper is rotatably connected to the bracket, and a tension spring is provided between the scraper and the bracket to make one end of the scraper adhere to the surface of the magnetic separation roller.

[0012] As a further improvement, a connecting plate is provided on one side of the aforementioned guide plate, and the aforementioned guide plate is fixedly installed on the inner wall of the aforementioned frame through the connecting plate.

[0013] As a further improvement, the aforementioned guide plate is a concave arc-shaped plate.

[0014] As a further improvement, the distance between the above-mentioned guide plate and the outer surface of the above-mentioned magnetic separation roller is 1cm to 2cm.

[0015] As a further improvement, the above-mentioned feeding mechanism includes a connecting seat with a hollow center, a crushing device is provided above the connecting seat, and the above-mentioned feeding port is provided at the upper end of the crushing device; the connecting seat is provided with a screening chamber, a screen is provided at the bottom of the screening chamber, a through hole for removing the screened material is provided on the side wall, and a conveying hopper for conveying the material to the magnetic separation mechanism is provided at the lower end of the screen.

[0016] As a further improvement, the aforementioned crushing device includes two crushing wheels that rotate in opposite directions and are driven by a motor.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] Firstly, this invention features several magnetic separation rollers installed between the feed inlet and the discharge outlet. By setting multiple magnetic separation rollers with progressively increasing magnetic field strength along the conveying direction, minerals with high iron content are recovered in a low-intensity magnetic field, while minerals with lower iron content are recovered in a higher-intensity magnetic field. This achieves efficient sorting during the conveying process. Furthermore, a separate collection hopper is installed below each magnetic separation roller for collection, enabling graded adsorption and classified management of iron minerals with different iron contents. Minerals with high iron content can be used for metallurgical recovery, while minerals with lower iron content can be used as raw materials for building materials, effectively realizing the efficient utilization of resources.

[0019] Secondly, in this invention, a scraper is provided on the lower side of the magnetic separation roller, and the scraper is attached to the outer surface of the magnetic separation roller by a tension spring. This structure uses the scraper to promptly scrape off the iron minerals on the surface of the magnetic separation roller, preventing the minerals from accumulating on the roller surface and affecting the magnetic separation efficiency. At the same time, the tension spring keeps the scraper in close contact with the roller surface, ensuring thorough scraping, improving separation quality and the stability of the device operation.

[0020] Thirdly, this invention achieves material transport by setting a guide plate between two magnetic separation rollers. The guide plate is a concave arc-shaped plate, which utilizes the gravitational potential energy during the material's descent to transport the material. This method is simple and effective, requiring no additional electric drive transmission structure. The arc-shaped plate is spaced 1cm to 2cm from the surface of the magnetic separation rollers to prevent iron minerals on the roller surface from being blocked or scraped off during roller rotation, ensuring smooth material conveying.

[0021] Fourth, the feeding mechanism of this utility model includes a connecting seat with a hollow center. A crushing device and a screening chamber are respectively arranged above and below the connecting seat. The material enters the crushing device through the feed inlet and is pre-crushed to a particle size suitable for magnetic separation. Excessively large particles or impurities are removed through the screening chamber, ensuring that the material entering the magnetic separation mechanism has a uniform particle size. The side wall of the screening chamber is provided with through holes for removing the screened material, facilitating the recovery of large particles. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0024] Figure 2 This is a partial structural schematic diagram of an embodiment of the present utility model;

[0025] Figure 3This is a schematic diagram of the internal structure of the magnetic separation roller in this utility model;

[0026] Figure 4 This is a schematic diagram of the overall structure of another embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram showing the position of the scraper in this utility model.

[0028] Figure label:

[0029] 100 - Frame; 110 - Feed inlet; 120 - Discharge outlet; 130 - Collection hopper; 131 - Baffle plate;

[0030] 1-Magnetic separator roller; 1a-First magnetic separator roller; 1b-Second magnetic separator roller; 1c-Third magnetic separator roller; 11-Scraper; 12-Magnetic system assembly; 12a-Magnetic yoke plate; 12b-Electromagnetic coil; 13-Magnetic system support; 14-Support; 15-Tension spring;

[0031] 2-Guide plate; 21-Connecting plate;

[0032] 31-Connecting seat; 32-Crushing device; 33-Screening bin; 33a-Screen; 33b-Through hole; 34-Feeding hopper. Detailed Implementation

[0033] To facilitate understanding by those skilled in the art, the structure of this utility model will now be described in further detail with reference to the accompanying drawings:

[0034] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. The terms "part," "side," "end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0035] like Figure 1 As shown, a screening device for extracting iron minerals from iron tailings includes a frame 100, a feeding mechanism and a discharge port 120 are provided inside the frame 100, a magnetic separation mechanism is provided between the feeding mechanism and the discharge port 120, and the magnetic separation mechanism is equipped with a collecting mechanism.

[0036] Specifically, the feeding mechanism is located at the top of the frame 100, and the feeding mechanism is provided with a feeding port 110. The bottom of the frame 100 is provided with a discharging port 120. The frame 100, as the supporting structure of the whole device, is usually made of steel or stainless steel.

[0037] Iron tailings are typically solid waste that has undergone preliminary processing. Their physical state and properties largely depend on the source of the tailings and its upstream processes. For wet tailings, dehydration or drying is required before they enter the equipment to reduce moisture content and prevent material agglomeration during conveying, which could affect efficiency. For dry tailings, crushing and screening are necessary to ensure efficient adsorption and separation. Figure 1 and Figure 2 In one specific embodiment, the feeding mechanism includes a connecting seat 31 with a central hollow section. A crushing device 32 is disposed above the connecting seat 31, and a feed inlet 110 is disposed at the upper end of the crushing device 32. A screening chamber 33 is disposed below the connecting seat 31. A screen 33a is disposed at the bottom of the screening chamber 33, and a through hole 33b for removing screened material is disposed on the side. A conveying hopper 34 for conveying material to a magnetic separation mechanism is disposed at the lower end of the screen 33a. Furthermore, the crushing device 32 includes two crushing wheels driven by a motor and rotating in opposite directions. The rotation of the crushing wheels can generate shearing and compressive forces, which can quickly crush large particles into uniform particles.

[0038] like Figure 1 and Figure 2 As shown, the magnetic separation mechanism includes multiple magnetic separation rollers 1, which are sequentially arranged between the feed inlet 110 and the discharge outlet 120. A guide plate 2 is provided between two adjacent magnetic separation rollers 1 to form a conveying channel. The magnetic separation rollers 1 rotate in the conveying direction, and the magnetic field strength of the multiple magnetic separation rollers 1 increases sequentially along the conveying channel. When the material passes through the magnetic separation rollers 1, iron minerals can be gradually separated. That is, at the magnetic separation rollers 1 with lower magnetic field strength, only iron minerals with stronger magnetism will be adsorbed; while as the material moves to the magnetic separation rollers 1 with higher magnetic field strength, iron minerals with weaker magnetism will also be adsorbed.

[0039] Furthermore, the magnetic separator 1 can be a permanent magnet roller or an electromagnetic roller. The permanent magnet roller uses a magnet as the magnetic field source, which is simple in structure and low in energy consumption. The electromagnetic roller uses an electromagnetic coil 12b to generate a magnetic field, which consumes more energy, but the magnetic field strength can be adjusted by adjusting the current intensity.

[0040] like Figure 3 and Figure 5 As shown, a scraper 11 is provided on the lower side of the magnetic separation roller 1. The scraper 11 is used to scrape off the iron minerals on the surface of the magnetic separation roller 1. The collecting mechanism is located below the magnetic separation mechanism and is provided with multiple partitions 131 to divide it into multiple collecting hoppers 130. The multiple collecting hoppers 130 are arranged one-to-one below the multiple magnetic separation rollers 1.

[0041] In one specific embodiment, the magnetic separation mechanism includes three magnetic separation rollers 1, namely a first magnetic separation roller 1a, a first magnetic separation roller 1b, and a third magnetic separation roller 1c. The magnetic field strength of the first magnetic separation roller 1a is 2000 Gs to 3000 Gs, and it is used to adsorb and separate iron minerals with strong magnetic properties, such as magnetite remaining in the iron ore beneficiation process, with an iron content of about 50% or more. The magnetic field strength of the first magnetic separation roller 1b is 4000 Gs to 6000 Gs, and it is used to adsorb and separate ores with relatively weak magnetic properties, such as some hematite and limonite with an iron content of about 30%. The magnetic field strength of the third magnetic separation roller 1c is 8000 Gs to 10000 Gs, and it is used to adsorb and separate hematite or other iron minerals with weak magnetic response with an iron content of less than 30%. High-iron-content iron ores can be used as a basic raw material for steel, applied in the iron and steel industry, and smelted into pig iron, wrought iron, ferroalloys, etc. Medium-iron-content iron ores can be used as additives in building materials, increasing the strength, durability, and corrosion resistance of building materials such as cement and concrete. Low-iron-content iron ores can be reused in the construction and environmental protection fields as adsorbents and wall materials.

[0042] It should be understood that the number of magnetic separation rollers 1 can be set according to actual needs, such as... Figure 1 and Figure 2 Two magnetic separation rollers 1 are set up as shown. The magnetic field strength of each roller 1 is adaptively adjusted according to the iron ore quality, tailings quality, and actual needs in the early stage of the process. Those skilled in the art should be able to implement this in accordance with the above description and the actual situation. It will not be described in detail here.

[0043] like Figure 3 The magnetic separator roller 1 in the illustrated embodiment is an electromagnetic roller, which has a magnetic system assembly 12 inside. The magnetic system assembly 12 includes a magnetic yoke plate 12a and an electromagnetic coil 12b. Specifically, a magnetic support 13 is fixed on the central shaft of the magnetic separator roller 1, and the aforementioned magnetic yoke plate 12a and electromagnetic coil 12b are fixed at the ends of the magnetic support 13. During operation, the magnetic support 13, the magnetic yoke plate 12a, and the electromagnetic coil 12b remain stationary, while the outer cylinder of the magnetic separator roller 1 rotates along the material movement direction. Figure 3 For example, the outer cylinder of the magnetic separation roller 1 rotates clockwise, and the iron tailings fall from above the magnetic separation roller 1. As the magnetic separation roller 1 rotates, the material moves to the right, and iron minerals with corresponding iron content are adsorbed. Iron minerals with low iron content and complex symbiotic minerals fall into the guide plate 2 with the movement trend and enter the next stage or are collected as waste.

[0044] Furthermore, the wrap angle of the magnetic system component 12 is 90° to 270°. For example... Figure 3As shown, the material falls from above the magnetic separator roller 1. To ensure that the material moves smoothly along the transport direction, the landing point should be on the right side of the longitudinal centerline of the magnetic separator roller 1. In contrast, the starting position of the magnetic system component 12 should be on the left side of the material landing point to ensure that the material is smoothly adsorbed from the surface of the magnetic separator roller 1. The ending position should be on the lower side of the guide plate 2 so as to release the adsorbed minerals into the collection hopper 130.

[0045] like Figure 3 and Figure 5 As shown, a support 14 is mounted on the roller shaft of the magnetic separator 1. A scraper 11 is rotatably connected to the support 14, and a tension spring 15 is provided between the scraper 11 and the support 14 to keep one end of the scraper 11 attached to the surface of the magnetic separator 1. During the extraction of iron ore, due to factors such as ambient humidity, the condition of the outer surface of the magnetic separator 1 (humidity, oil stains), and mineral particles, some iron ore fails to fall normally after passing the magnetic system component area and is scraped off by the scraper 11 when it rotates to the scraper 11. The scraper 11 is attached to the surface of the magnetic separator 1 by the tension spring 15. The structure is simple, can remove residual minerals, improve the recovery rate, and at the same time prevent equipment wear and extend its service life.

[0046] like Figures 1-4 As shown, a connecting plate 21 is provided on one side of the guide plate 2, and the guide plate 2 is fixedly installed on the inner wall of the frame 100 through the connecting plate 21. The guide plate 2 is a concave arc-shaped plate, which realizes the material transportation by the gravitational potential energy during the material falling process. It is simple and effective and does not require an additional electric drive transmission structure. The guide plate 2 is spaced 1cm to 2cm from the outer surface of the magnetic separator roller 1 to prevent the iron minerals on the surface of the magnetic separator roller 1 from being blocked or scraped off by the arc-shaped plate when the magnetic separator roller 1 rotates, thus ensuring smooth material conveying.

[0047] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A screening device for extracting iron minerals from iron tailings, comprising a frame (100), wherein a feeding mechanism is provided at the top of the frame (100) and a feed inlet (110) is provided at the bottom of the frame (100), and a magnetic separation mechanism and a collecting mechanism are provided inside, characterized in that: The magnetic separation mechanism includes multiple magnetic separation rollers (1), which are sequentially arranged between the feed inlet (110) and the discharge outlet (120), and a guide plate (2) is provided between two adjacent magnetic separation rollers (1) to form a conveying channel. The magnetic field strength of the multiple magnetic separation rollers (1) increases sequentially along the conveying channel. A scraper (11) is provided on the lower side of the magnetic separation roller (1), and the scraper (11) is used to scrape off the iron minerals on the surface of the magnetic separation roller (1); the collecting mechanism is provided below the magnetic separation mechanism and is provided with multiple partitions (131) to divide it into multiple collecting hoppers (130), and the multiple collecting hoppers (130) are arranged one-to-one below the multiple magnetic separation rollers (1).

2. The screening device for extracting iron minerals from iron tailings as described in claim 1, characterized in that: It includes a first magnetic separation roller (1a), a second magnetic separation roller (1b), and a third magnetic separation roller (1c). The magnetic field strength of the first magnetic separation roller (1a) is 2000 Gs to 3000 Gs, the magnetic field strength of the second magnetic separation roller (1b) is 4000 Gs to 6000 Gs, and the magnetic field strength of the third magnetic separation roller (1c) is 8000 Gs to 10000 Gs.

3. The screening device for extracting iron minerals from iron tailings as described in claim 2, characterized in that: The magnetic separator (1) is equipped with a magnetic system assembly (12) inside, and the wrap angle of the magnetic system assembly (12) is 90° to 270°.

4. The screening device for extracting iron minerals from iron tailings as described in claim 2, characterized in that: The magnetic separation roller (1) is a permanent magnet roller or an electromagnetic drum.

5. The screening device for extracting iron minerals from iron tailings as described in claim 1, characterized in that: A bracket (14) is provided on the roller shaft of the magnetic separation roller (1), and the scraper (11) is rotatably connected to the bracket (14). A tension spring (15) is provided between the scraper (11) and the bracket (14) to make one end of the scraper (11) adhere to the surface of the magnetic separation roller (1).

6. The screening device for extracting iron minerals from iron tailings as described in claim 1, characterized in that: A connecting plate (21) is provided on one side of the guide plate (2), and the guide plate (2) is fixedly installed on the inner wall of the frame (100) through the connecting plate (21).

7. The screening device for extracting iron minerals from iron tailings as described in claim 6, characterized in that: The guide plate (2) is a concave arc-shaped plate.

8. The screening device for extracting iron minerals from iron tailings as described in claim 7, characterized in that: The guide plate (2) and the outer surface of the magnetic separator (1) are spaced 1cm to 2cm apart.

9. The screening device for extracting iron minerals from iron tailings as described in claim 1, characterized in that: The feeding mechanism includes a connecting seat (31) with a hollow center. A crushing device (32) is provided above the connecting seat (31), and the feeding port (110) is provided at the upper end of the crushing device (32). A screening chamber (33) is provided below the connecting seat (31). A screen (33a) is provided at the bottom of the screening chamber (33), and a through hole (33b) for removing screened material is provided on the side wall. A conveying hopper (34) for conveying material to the magnetic separation mechanism is provided at the lower end of the screen (33a).

10. The screening device for extracting iron minerals from iron tailings as described in claim 9, characterized in that: The crushing device (32) includes two crushing wheels that are driven by a motor and rotate in opposite directions.

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