A high-yield pre-selection device for magnetite

Abstract

The present invention relates to the field of crushing-magnetic separation technology in a mineral processing plant, and in particular to a high-yield pre-selection device for magnetite. The device comprises a frame, a crusher, a rougher, a scavenger, a hopper, a feed box, and a discharge box. The crusher is a crushing unit, the rougher and the scavenger constitute a dry separation unit, and the discharge box is a discharge unit. The crusher, rougher, and scavenger are fixed to the frame in order from top to bottom. The hopper is located at the bottom of the crusher's discharge port, the feed box is fixed to the bottom of the hopper, and the discharge box is fixed to the bottom of the feed box. The magnetic separation roller of the rougher is located in the feed box, below one side of the hopper outlet. The scavenging and sorting plate of the scavenger is located in the feed box, below the other side of the hopper outlet, and below the magnetic separation roller. The device can ensure a high recovery rate of magnetic materials, integrate crushing operations and large-particle dry separation and waste disposal operations, and reduce investment in equipment and plant buildings.

Description

Technical Field

[0001] The present invention relates to the technical field of crushing-magnetic separation in ore dressing plants, in particular to a high-yield pre-selection device for magnetite. Background Art

[0002] Currently, most magnetite ores have a low grade, ranging from 25% to 35%. The mined ore contains not only a large amount of gangue but also mixed surrounding rock. Pre-selecting the mined ore after primary crushing to remove the gangue and surrounding rock can significantly reduce the subsequent crushing and grinding workload, thereby significantly reducing energy consumption, equipment, and infrastructure investment in related operations.

[0003] Gyratory crushers are widely used in open-pit mines due to their high single-unit processing capacity and strong adaptability to material particle size and moisture content. Gyratory crushers discharge ore in a circular, peripheral ring pattern at the bottom, which cannot achieve the strip-like feeding of traditional magnetic separation rollers. Therefore, material cannot be directly fed into the magnetic rollers of a belt dry separator, thus preventing the one-stop integration of magnetic rollers and gyratory crushers to reduce equipment and plant investment.

[0004] Currently, the products of magnetite crushing are all discarded using an independently set dry-sorting belt conveyor. The equipment is large and requires an independent dry-sorting workshop. This requires large equipment investment, large workshop investment, and complex operation and management costs.

[0005] For low-grade magnetite ores, the primary performance indicator during large-particle dry separation is to ensure the recovery rate of magnetic iron, ensuring that the vast majority of the magnetic iron can enter the subsequent grinding process, and that the recovery rate of the final separated iron concentrate can reach over 75% under the conditions of sufficient grinding and dissociation. Therefore, the primary control indicator for the large-particle tailing of the coarse crushed product of gyratory crushing is to ensure the recovery rate of the magnetic material in the large-particle pre-selected concentrate. Summary of the Invention

[0006] In order to overcome the shortcomings of the existing technology, the present invention provides a high-yield pre-selection device for magnetite, which can ensure a high recovery rate of magnetic bodies, integrate crushing operations and large-particle dry separation and waste disposal operations, and reduce equipment and plant investment.

[0007] To achieve the above objectives, the present invention adopts the following technical solutions:

[0008] A high-yield pre-selection device for magnetite comprises a frame, a crusher, a rougher, a scavenger, a collection hopper, a feed box and a discharge box, wherein the crusher is a crushing unit, the rougher and the scavenger constitute a dry selection unit, and the discharge box is an ore discharge unit; the crusher, the rougher and the scavenger are fixed to the frame in sequence from top to bottom, the collection hopper is located at the bottom of the crusher discharge port, the feed box is fixed to the bottom of the collection hopper, and the discharge box is fixed to the bottom of the feed box; the magnetic separation roller of the rougher is located in the feed box, below one side of the collection hopper outlet; the scavenging and sorting plate of the scavenger is located in the feed box, below the other side of the collection hopper outlet, and below the magnetic separation roller.

[0009] Furthermore, the frame includes vertical columns and horizontal upper, middle and lower platforms fixed between the columns; the crusher is fixed to the upper platform by bolts, the rougher is fixed to the middle platform by bolts, and the sweeper is fixed to the lower platform by bolts.

[0010] Furthermore, the crusher is a gyratory crusher.

[0011] Furthermore, the rougher includes a magnetic separation roller and a rougher motor, which is connected to the magnetic separation roller and drives it to rotate; the roller shaft of the magnetic separation roller is installed on the bearing, the bearing is installed in the bearing seat, the bearing seat is fixed to the support beam, and the support beam is fixed to the feed box.

[0012] Furthermore, a permanent magnetic system with a wrap angle of 110 to 130 degrees is built into the magnetic separation roller on the side facing the material flow. The magnetic system is fan-shaped and is arranged with the horizontal axis of the separation roller as the center line. The magnetic system has no substantial connection with the magnetic separation roller and is a fixed non-rotating body.

[0013] Furthermore, the surface of the magnetic separation roller is provided with a wear-resistant rubber layer of 30mm to 80mm, and the magnetic field strength on the roller surface is 400mT to 600mT.

[0014] Furthermore, the sweeping and sorting machine includes a sweeping and sorting plate, a sweeping and sorting machine motor, a transmission roller and a roller group; the sweeping and sorting plate is vertically fixed between the front and rear side plates of the feed box, and the transmission belt passes around the roller group, the sweeping and sorting plate and the transmission roller. The sweeping and sorting machine motor adopts a variable frequency speed regulation motor. The sweeping and sorting machine motor is connected to the transmission roller and drives it to rotate, thereby driving the transmission belt to operate.

[0015] Furthermore, the roller group includes a first redirecting roller, a second redirecting roller, a third redirecting roller and a fourth redirecting roller. The first redirecting roller and the second redirecting roller are parallel to each other, the third redirecting roller and the fourth redirecting roller are parallel to each other, the first redirecting roller and the second redirecting roller are parallel to each other and are located below, the second redirecting roller and the third redirecting roller are located in the feed box and on the outside of the scanning and sorting plate.

[0016] Furthermore, the scanning and sorting plate is composed of a vertical plate and an inclined plate, the inclined plate is located below the vertical plate, and the angle between the vertical plate and the inclined plate is 110-130 degrees.

[0017] Furthermore, the discharge box includes a box body and a partition. The box body is rectangular. Two partitions are parallel to each other and vertically fixed between the front and rear side plates of the box body to form a waste rock discharge port and ore discharge ports on both sides thereof.

[0018] Compared with the existing technology, the beneficial effects of the present invention are:

[0019] 1) The present invention comprises a crushing unit, a dry separation unit, and a discharge unit from top to bottom, all connected to a common, integrated frame. This unit integrates gyratory crushing and dry separation into a single unit. Compared to traditional gyratory crushing and dry separation systems, which require two separate units located in separate workshops, the present invention requires fewer devices, reduces equipment purchase and construction investment, and lowers operating and maintenance costs, significantly increasing the economic benefits of the concentrator.

[0020] 2) The pre-selected feed of the present invention is low-grade magnetite ore, which is a finely crushed product in magnetite. The tailing of the pre-selected feed can remove a large amount of waste rock and surrounding rock, thereby greatly reducing the processing capacity of subsequent grinding and selection operations, and then reducing the subsequent equipment and plant investment, energy consumption and operating costs.

[0021] 3) The collecting hopper of the present invention achieves a shift from circular distribution of crushed products to vertically downward distribution of aggregated products from a strip-shaped outlet, thereby reducing the vertical width of the material to 200-400 mm. This effectively avoids the situation where the magnetic separation material cannot be adsorbed due to excessive field strength reduction caused by excessive separation width and excessive distance between the boundary material and the magnetic separation roller. This advantageously optimizes the separation environment of the magnetic separation roller, thereby ensuring a high recovery rate of magnetic iron.

[0022] 4) During roughing, the material falls relatively slowly, and magnetic rollers are used for sorting. After the magnetic rollers, when the material falls faster, sorting plates are used. The long sorting plates ensure sufficient time for sweeping. This approach of using different sorting equipment at different material drop speed extremes ensures sufficient sorting time, thereby guaranteeing optimal sorting results.

[0023] 5) The roughing field strength of this invention is 400-600 mT. This relatively strong field strength ensures sufficient recovery of the vast majority of magnetically separated minerals. The scavenging field strength is 1.1-1.2 times that of the roughing field strength, allowing for the additional recovery of some weakly magnetic ore-gangue conglomerates and a small amount of ore entrained in the roughing waste rock. This combination of roughing and scavenging ensures a high recovery rate of magnetic iron.

[0024] 6) The roughing and scavenging devices of the present invention are respectively arranged on both sides of the material flow, so that the entire width of the material flow is within the range of the roughing and scavenging magnetic fields, achieving deep pre-selection across the entire width and ensuring a high recovery rate of magnetic iron.

[0025] 7) The surface of the magnetic separation roller of the present invention is provided with a wear-resistant rubber layer of 30mm to 80mm, which effectively guarantees the service life of the magnetic separation roller, reduces the maintenance frequency of the magnetic separation roller, and improves the equipment operation rate.

[0026] 8) The present invention uses redirecting rollers to redirect the conveyor belt downward after it exits the feed box horizontally. This method places the majority of the conveyor belt, drive rollers, and transmission components externally to the feed and discharge boxes, facilitating rapid inspection and repair of these components and reducing operating and maintenance costs. Furthermore, the downward arrangement close to the box fully utilizes the height difference between the feed box and the discharge section, achieving common frame integration, a more compact equipment layout, and a high degree of integration.

[0027] 9) The scanning unit of the present invention forms the adsorption of magnetic ore on the vertical section of the sorting plate by covering the conveyor belt on the sorting plate, and realizes the movement of the magnetic ore from the vertical direction to the nearly horizontal direction through the 110-130° arc, and then is transported to the rear of the folding plate with the conveyor belt, and is unloaded to the side of the ore of the discharge part under the action of single inertia. This method realizes the adsorption-diversion-unloading of the ore, has a simple and practical structure, and low manufacturing cost.

[0028] 10) The scanning and selecting unit device of the present invention realizes the switching of the conveying direction of the conveyor belt by changing the direction of the roller group. This roller steering method is beneficial to energy saving and reducing the wear of the conveyor belt.

[0029] 11) The motors of the rougher and sweeper of the present invention both use variable frequency speed regulating motors, which can adjust the speed of the conveyor belt, and then adjust the inertial kinetic energy of the adsorbed magnetic ore during unloading, change the unloading trajectory of the magnetic ore, and thus adjust the ratio of materials on both sides of the partition plate to maximize the recovery rate of magnetic iron in the dry-selected concentrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the present invention.

[0031] In the figure: 11 - upper platform 12 - middle platform 13 - lower platform 14 - column 2 - crusher 31 - magnetic separation roller 32 - rougher motor 33 - bearing seat 34 - support beam 35 - magnetic system 41 - first redirecting roller 42 - second redirecting roller 43 - third redirecting roller 44 - fourth redirecting roller 45 - sweeping and sorting plate 451 - vertical plate 452 - inclined plate 46 - sweeper motor 47 - drive roller 48 - conveyor belt 5 - collecting hopper 51 - base 6 - feed box 71 - partition 72 - waste rock discharge port 73 - ore discharge port DETAILED DESCRIPTION

[0032] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0033] In the description of the present invention, unless otherwise specified, "a plurality of" means two or more; the term

[0034] Directions or positional relationships indicated by terms such as "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail" are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0036] [Example]

[0037] like Figure 1 As shown, a high-yield pre-selection device for magnetite includes a frame, a crusher 2, a rougher, a scavenger, a collecting hopper 5, a feeding box 6 and a discharge box 7. The crusher is a crushing unit, the rougher and the scavenger constitute a dry selection unit, and the discharge box 7 is an ore discharging unit.

[0038] The frame includes vertical columns 14, an upper platform 11, a middle platform 12 and a lower platform 13. The upper platform 11, the middle platform 12 and the lower platform 13 are arranged horizontally and fixed between the vertical columns 14 in sequence from top to bottom.

[0039] Crusher 2 is an existing product, which adopts a gyratory crusher. The motor and base of crusher 2 are all fixedly connected to the top surface of upper platform 11 by bolts.

[0040] The hopper 5 is a box-like structure with open top and bottom openings. Its upper opening is circular and located 50-100 mm outside the circumferential discharge opening of the gyratory crusher 2. From the upper opening, a square-shaped material receiving section extends downward to a vertical section connected to its lower opening. This vertical section is a long rectangular box with a lower opening that is 200-400 mm wide and 1000-2000 mm long. The hopper 5 is bolted to the bottom surface of the upper platform 11 of the frame via a base 51 located on its outer side.

[0041] The feeding box 6 is a square box body provided below the collecting hopper 5 and is flange-connected to the collecting hopper 5 .

[0042] The rougher includes a magnetic separation roller 31 and a rougher motor 32. The rougher motor 32 uses a variable-frequency speed-regulating motor and is connected to the magnetic separation roller 31, driving its rotation. The roller shaft of the magnetic separation roller 31 is mounted on bearings, which are mounted in bearing blocks 33. The bearing blocks 33 are fixed to support beams 34, which are fixed to the feed box 6.

[0043] A permanent magnetic system 35 with a wrap angle of 110 to 130 degrees is built into the magnetic separation roller 31 on the side facing the material flow. The magnetic system 35 is fan-shaped and is arranged with the horizontal axis of the magnetic separation roller 31 as the center line. The magnetic system 35 has no substantial connection with the magnetic separation roller 31 and is a fixed non-rotating body.

[0044] The surface of the magnetic separation roller 31 is provided with a wear-resistant rubber layer of 30 mm to 80 mm, and the magnetic field strength on the roller surface is 400 mT to 600 mT.

[0045] The sweeper includes a sweeping and sorting plate 45, a sweeper motor 46, a drive roller 47, a first redirecting roller 41, a second redirecting roller 42, a third redirecting roller 43, and a fourth redirecting roller 44. The sweeping and sorting plate 45 is composed of a vertical plate 451 and an inclined plate 452. The inclined plate 452 is located below the vertical plate 451, and the angle between the vertical plate 451 and the inclined plate 452 is 110-130 degrees.

[0046] The sweeper motor 46 and the transmission roller 47 are fixedly connected to the lower platform 13. The sweeper motor 46 is a variable frequency speed motor. The sweeper motor 46 is connected to the transmission roller 47 and drives it to rotate, thereby driving the conveyor belt 48 installed on the transmission roller 47. The sweeper and sorting plate 45 is fixedly connected between the front and rear side plates of the feed box 6.

[0047] The first redirecting roller 41 and the second redirecting roller 42 are fixedly connected to the bottom surface of the middle platform 12 in parallel with each other, and the third redirecting roller 43 and the fourth redirecting roller 44 are fixedly connected to the top surface of the middle platform 12 in parallel with each other. The second redirecting roller 42 and the third redirecting roller 43 have the same vertical position and are located in the feeding box 6, on the left side of the sweeping and sorting plate 45. The first redirecting roller 41 is located on the left side of the second redirecting roller 42, and the fourth redirecting roller 44 is located on the left side of the third redirecting roller 43.

[0048] The conveyor belt 48 is sequentially routed over the drive roller 47, the first redirecting roller 41, the second redirecting roller 42, the scavenging and sorting plate 45, the third redirecting roller 43, and the fourth redirecting roller 44. The conveyor belt 48 bends at the second and third redirecting rollers 42 and 43 at an angle of 110 to 130 degrees. After passing over the second and third redirecting rollers 42 and 43, the conveyor belt is arranged horizontally and passes through the notch in the left side panel of the feed box 6 before exiting the feed box 6. The conveyor belt 48 then passes over the fourth redirecting roller 44 and the first redirecting roller 41, turning downward. The conveyor belt 48 is lined with 30 to 80 mm thick wear-resistant rubber.

[0049] The fourth redirecting roller 44 is located outside the feeding box 6 and is arranged at the same height as the third redirecting roller 43; the first redirecting roller 41 is located outside the feeding box 6, and its top is arranged at the same height as the bottom of the second redirecting roller 42. The distance between the first redirecting roller 41 and the feeding box 6 is 100 to 200 mm; the horizontal spacing between the fourth redirecting roller 44 and the first redirecting roller 41 is greater than 1.2 to 1.3 times the diameter of the drive roller 47.

[0050] The discharge box includes a box body and a partition 71. The box body is rectangular. Two partitions 71 are parallel to each other and vertically fixed between the front and rear side plates of the box body to form a waste rock discharge port 72 and ore discharge ports 73 located on both sides thereof.

[0051] The present invention is provided with a crushing unit, a dry separation unit and a discharge unit from top to bottom, and the three units are connected to a common integral frame to form a whole. Thus, the gyratory crushing and dry separation operations are integrated into one device. Compared with the traditional gyratory crushing and dry separation which use two devices and are independently arranged in different workshops, the present invention has a small number of devices, a small investment in equipment purchase and construction, and low operating and maintenance costs, which can greatly increase the economic benefits of the ore dressing plant. The pre-selected feed of the present invention is low-grade magnetite ore, which is a finely crushed product among magnetite ore. The tailing of the pre-selected feed can throw out a large amount of waste rock and surrounding rock, thereby greatly reducing the processing capacity of subsequent grinding operations, and then reducing the subsequent equipment and plant investment, and reducing energy consumption and operating costs.

[0052] The collecting hopper 5 of the present invention achieves a shift from circular distribution of crushed products to bundled distribution vertically downward from a long strip outlet, thereby reducing the vertical width of the material to 200-400 mm. This effectively avoids the situation where the magnetic separation material cannot be adsorbed due to excessive field strength reduction caused by the material separation width being too wide and the boundary material being too far from the magnetic separation roller 31. This advantageously optimizes the separation environment of the magnetic separation roller 31, thereby ensuring a high recovery rate of magnetic iron.

[0053] During roughing, the material falls relatively slowly, and magnetic separation rollers 31 are used for sorting. After the magnetic separation rollers 31, the material falls faster, and the sweeping separation plate 45 is used for sorting. The separation plate is relatively long, ensuring sufficient separation time for sweeping. This method of using different separation equipment at different material falling speed extremes ensures sufficient separation time, thereby ensuring the separation effect.

[0054] The roughing field strength of this invention is 400mT to 600mT. This relatively strong field strength ensures sufficient recovery of the vast majority of magnetically separated minerals. The scavenging field strength is 1.1 to 1.2 times that of the roughing field strength, allowing for the recovery of some weakly magnetic ore-gangue conglomerates and a small amount of ore entrained in the roughing waste rock. This combination of roughing and scavenging ensures a high recovery rate of magnetic iron.

[0055] The roughing and scavenging devices of the present invention are respectively arranged on both sides of the material flow, so that the entire width of the material flow is within the magnetic field range of the roughing and scavenging, realizing deep pre-selection in the full width range and ensuring a high recovery rate of magnetic iron.

[0056] The surface of the magnetic separation roller 31 of the present invention is provided with a wear-resistant rubber layer of 30 mm to 80 mm, which advantageously guarantees the service life of the magnetic separation roller, reduces the maintenance frequency of the magnetic separation roller, and improves the equipment operation rate.

[0057] The present invention uses the function of redirecting rollers to transfer the conveyor belt downward after it passes horizontally out of the feed box 6. This method places the vast majority of the conveyor belt 18, the drive rollers 47, and the transmission unit externally to the feed box 6 and the discharge box, facilitating rapid maintenance of these components and reducing operating and maintenance costs. Furthermore, the downward arrangement close to the box body fully utilizes the height difference between the feed box 6 and the discharge box, achieving common frame integration, a more compact equipment layout, and a high degree of integration.

[0058] The scanning and sorting unit of the present invention forms the adsorption of magnetic ore on the vertical section of the scanning and sorting plate 45 by covering the conveyor belt 48 on the scanning and sorting plate 45, and realizes the movement of the magnetic ore from the vertical direction to the nearly horizontal direction through the folding arc of 110 to 130 degrees, and then is transported to the rear of the folding plate with the conveyor belt, and is unloaded to the side of the ore of the discharge part under the action of single inertia. This method realizes the adsorption-diversion-unloading of the ore, has a simple and practical structure, and low manufacturing cost.

[0059] The scanning unit device of the present invention realizes the switching of the conveying direction of the conveyor belt 48 by the redirection roller group. This roller steering method is beneficial to energy saving and reducing the wear of the conveyor belt.

[0060] The rougher motor 32 and the sweeper motor 46 of the present invention both use variable frequency speed control motors, which can adjust the belt speed of the conveyor belt 48, and then adjust the inertial kinetic energy of the adsorbed magnetic ore during unloading, change the unloading trajectory of the magnetic ore, and thus adjust the ratio of materials on both sides of the partition 71 to maximize the recovery rate of magnetic iron in the dry-selected concentrate.

Claims

1. A high-yield pre-selection device for magnetite, characterized by: It includes a frame, a crusher, a rougher, a scavenger, a collection hopper, a feeding box and a discharging box. The crusher is a crushing unit, the rougher and the scavenger constitute a dry separation unit, and the discharging box is a ore discharging unit. The crusher, the rougher and the scavenger are fixed to the frame in order from top to bottom. The collection hopper is located at the bottom of the crusher discharge port, the feeding box is fixed to the bottom of the collection hopper, and the discharging box is fixed to the bottom of the feeding box. The magnetic separation roller of the rougher is located in the feeding box, below one side of the collection hopper outlet. The scavenging and sorting plate of the scavenger is located in the feeding box, below the other side of the collection hopper outlet, and below the magnetic separation roller. The field strength of roughing is 400mT~600mT, and the field strength of sweeping is 1.1~1.2 times of the roughing field strength; The crusher is a gyratory crusher; The sweeping machine includes a sweeping and sorting plate, a sweeping and sorting machine motor, a transmission roller and a roller group; the sweeping and sorting plate is vertically fixed between the front and rear side plates of the feed box, and the transmission belt passes through the roller group, the sweeping and sorting plate and the transmission roller. The sweeping and sorting machine motor adopts a variable frequency speed regulation motor, which is connected to the transmission roller and drives it to rotate, thereby driving the transmission belt to operate; The roller group includes a first redirecting roller, a second redirecting roller, a third redirecting roller and a fourth redirecting roller, the first redirecting roller and the second redirecting roller are parallel to each other, the third redirecting roller and the fourth redirecting roller are parallel to each other, the first redirecting roller and the second redirecting roller are located at the bottom, and the second redirecting roller and the third redirecting roller are located in the feed box and outside the sweeping and sorting plate; The sweeping and sorting plate is composed of a vertical plate and an inclined plate. The inclined plate is located below the vertical plate, and the angle between the vertical plate and the inclined plate is 110-130 degrees. The discharge box includes a box body and a partition. The box body is rectangular. Two partitions are parallel to each other and vertically fixed between the front and rear side plates of the box body to form a waste rock discharge port and ore discharge ports on both sides thereof.

2. A high-yield pre-selection device for magnetite according to claim 1, characterized in that: The frame includes vertical columns and horizontal upper, middle and lower platforms fixed between the vertical columns; the crusher is fixed to the upper platform by bolts, the rougher is fixed to the middle platform by bolts, and the sweeper is fixed to the lower platform by bolts.

3. The high-yield pre-selection device for magnetite according to claim 1, characterized in that: The rougher includes a magnetic separation roller and a rougher motor. The rougher motor adopts a variable frequency speed regulation motor. The rougher motor is connected to the magnetic separation roller and drives it to rotate. The roller shaft of the magnetic separation roller is installed on the bearing, the bearing is installed in the bearing seat, the bearing seat is fixed to the support beam, and the support beam is fixed to the feed box.

4. A high-yield pre-selection device for magnetite according to claim 3, characterized in that: The magnetic separation roller has a built-in permanent magnetic system with a wrap angle of 110 to 130 degrees on the side facing the material flow. The permanent magnetic system is fan-shaped and is arranged with the horizontal axis of the magnetic separation roller as the center line. The magnetic system has no substantial connection with the magnetic separation roller and is a fixed non-rotating body.

5. The high-yield pre-selection device for magnetite according to claim 3, characterized in that: The surface of the magnetic separation roller is provided with a wear-resistant rubber layer of 30mm to 80mm.

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