A special magnetic separator for coal washing

Abstract

The invention discloses a special magnetic separator for coal washing, which belongs to the technical field of heavy medium coal washing equipment, and comprises a frame with a trough body installed; a feed port is arranged on the trough body; the trough body comprises an upper arc trough provided with an upper toothed inductive magnetic medium and a lower arc trough provided with a lower toothed inductive magnetic medium; a drum is located above the trough body and forms a gap with the trough body for slurry flow; at the gap, the rotation direction of the drum is opposite to the slurry flow direction; the gap is located above the feed port at one end to form a magnetic material discharge port, and the other end of the gap forms a tailings discharge port; a magnetic system is arranged in the drum and fixedly connected to the frame, the magnetic system is arranged close to the gap and distributed along the extension direction of the gap; the magnetic wrap angle of the magnetic system is not less than the radian of the gap; the upper toothed inductive magnetic medium and the lower toothed inductive magnetic medium of the invention can generate an induced magnetic field to form a magnetic curtain under the action of the magnetic system, can change the state of the magnetic circuit and magnetic lines of force, enhance the magnetic field energy at the drum surface, increase the grabbing and capturing ability, and prevent the magnetic material from refluxing and escaping.

Description

Technical Field

[0001] The invention relates to the technical field of heavy medium coal washing equipment, and in particular to a special magnetic separator for coal washing. Background Art

[0002] Improving clean coal technology and upgrading manufacturing processes are the key to achieving green and low-carbon development of coal. At present, the main means of clean coal technology is to adopt coal preparation technology, including jigging, heavy medium, flotation selection, etc.; and as one of the coal preparation technologies, heavy medium coal preparation, medium consumption is one of the most important economic and technical indicators, which not only affects the production cost, but also affects the clean coal yield; the lost medium will also damage the pipelines and equipment in the coal washing process to a certain extent; therefore, the medium recovery standard was introduced, and the magnetic material recovery rate should not be lower than 99.8%. The consumption of magnetite powder per ton of raw coal in the heavy medium coal preparation process is: less than 0.8kg / t for lump coal; less than 2.0kg / t for mixed coal and fine coal; practice shows that the magnetic separator can efficiently recover magnetic materials and reduce medium consumption, and plays a unique role in the coal preparation process. It is a key equipment for heavy medium purification and recovery in the heavy medium coal preparation process.

[0003] In the production and operation of various coal preparation plants, magnetic separators generally have serious media leakage, and the main factor causing this phenomenon is the magnetic separation effect of the magnetic separator; first, the slurry affects the magnetic separation effect. Changes in slurry concentration, particle size, and the proportion of magnetic and non-magnetic materials will cause increased media consumption; second, debugging, management, and maintenance have an impact on the magnetic separation effect. Improper equipment parameter debugging, trough blockage, uneven feeding, etc. will lead to incomplete recovery of magnetic materials, and the operating level of operating staff will also affect the magnetic separation effect to a certain extent; third, the structure of the magnetic separator affects the magnetic separation effect. The key components of the magnetic separator, such as the magnetic system, cylinder, and trough, are not designed scientifically and manufactured in a standardized manner, which will inevitably affect the technical performance of the equipment.

[0004] At present, new technical performance requirements have been put forward for special magnetic separators in coal washing plants: improving the recovery rate of magnetic materials, increasing the processing capacity of single machines, increasing the feed particle size, and improving the reliability and stability of equipment operation.

[0005] Therefore, it is an urgent problem to be solved at this stage to develop and design a special magnetic separator for coal washing with high magnetic recovery rate, large single-machine processing capacity, stable operation, and the ability to effectively avoid the running, bubbling, dripping and leakage of magnetic materials. Summary of the invention

[0006] In order to solve the problems existing in the prior art, the present invention provides a special magnetic separator for coal washing, which utilizes the upper tooth-shaped induction magnetic medium and the lower tooth-shaped induction magnetic medium located near the feed port to generate an induced magnetic field to form a magnetic curtain under the action of the external magnetic field of the magnetic system, and can change the magnetic circuit and magnetic line state of the magnetic system, thereby enhancing the magnetic field energy at the drum surface, increasing the ability to capture magnetic materials, avoiding the backflow and escape of magnetic materials, effectively improving the recovery rate of magnetic materials, avoiding the occurrence of running, bubbling, dripping and leakage of magnetic materials, and having large single-machine processing capacity and stable operation.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] The present invention provides a special magnetic separator for coal washing, comprising:

[0009] A frame, a trough body is installed on the frame; a feed port is arranged on the trough body; the trough body comprises an upper arc-shaped trough located above the feed port and a lower arc-shaped trough located below the feed port; an upper tooth-shaped inductive magnetic medium is arranged at a position of the upper arc-shaped trough close to the feed port, and a lower tooth-shaped inductive magnetic medium is arranged at a position of the lower arc-shaped trough close to the feed port;

[0010] A roller, the roller is rotatably arranged on the frame, the roller is located above the tank body, a gap is formed between the roller and the tank body, and the slurry can flow in the gap; at the gap, the rotation direction of the outer peripheral surface of the roller is opposite to the flow direction of the slurry; one end of the gap located above the feed port forms a magnetic material discharge port, and the other end of the gap forms a tailings discharge port;

[0011] A magnetic system is arranged in the drum and fixedly connected to the frame, the magnetic system is arranged close to the gap and distributed along the extension direction of the gap; the magnetic wrap angle of the magnetic system is not less than the curvature of the gap.

[0012] As a preferred technical solution, the area of ​​the gap located between the feed port and the magnetic material discharge port is provided with a sorting area and a unloading area in sequence, and the area of ​​the gap located between the feed port and the tailings discharge port is provided with a recovery area and a scavenging area in sequence; the upper tooth-shaped induction magnetic medium is provided at the sorting area, and the lower tooth-shaped induction magnetic medium is provided at the recovery area.

[0013] As a preferred technical solution, the magnetic system includes four first main magnetic poles, one second main magnetic pole, two third main magnetic poles and three auxiliary magnetic poles; the second main magnetic pole is arranged close to the unloading area, one first main magnetic pole is arranged close to the sorting area, one third main magnetic pole is arranged opposite to the feed port, another third main magnetic pole is arranged close to the recovery area, and the other three first main magnetic poles are arranged close to the scanning area, and the three auxiliary magnetic poles are respectively arranged between adjacent second main magnetic poles and first main magnetic poles and between adjacent first main magnetic poles.

[0014] As a preferred technical solution, the first main magnetic pole, the second main magnetic pole, the third main magnetic pole and the auxiliary magnetic pole in the magnetic system are distributed in a fan shape;

[0015] And / or, the first main magnetic pole, the second main magnetic pole and the auxiliary magnetic pole are all made of ferrite magnetic material;

[0016] And / or, the pole face widths of the first main magnetic pole and the second main magnetic pole are both set to 135 mm, the pole pitches of the first main magnetic pole and the second main magnetic pole are both set to 210 mm, the pole group height of the first main magnetic pole is set to 140 mm, and the pole group height of the second main magnetic pole is set to 90 mm;

[0017] And / or, the third main magnetic pole is made of neodymium iron boron magnetic material;

[0018] And / or, the pole face width of the third main magnetic pole is set to 100 mm, the pole group height is set to 30 mm, and the magnetic pole pitch is set to 130 mm;

[0019] And / or, the cross section of the auxiliary magnetic pole is an isosceles trapezoid, and the magnetization direction of the auxiliary magnetic pole is perpendicular to the midline of the isosceles trapezoid;

[0020] And / or, the magnetic wrap angle of the magnetic system is set to 150°.

[0021] As a preferred technical solution, the drum includes a cylinder body, both ends of which are provided with end covers; a central axis is provided on the frame, the central axis passes through the cylinder body and is respectively rotatably connected to the centers of the two end covers, and the magnetic system is fixed on the central axis.

[0022] As a preferred technical solution, support seats are provided at both ends of the frame corresponding to the central axis, and an adjustment pad is provided between the support seat and the frame;

[0023] And / or, the central shaft and the end cover are rotatably connected via a bearing;

[0024] And / or, a reduction motor is provided on the frame, and the reduction motor is drivingly connected to the drum;

[0025] And / or, the cylinder body is configured as a nested structure of two layers of cylinder skins, the material of the two layers of cylinder skins are both configured as austenitic stainless steel, or the material of one layer of cylinder skin is configured as austenitic stainless steel, and the material of the other layer of cylinder skin is configured as wear-resistant rubber;

[0026] And / or, the material of the end cover is set to be austenitic stainless steel or aluminum alloy.

[0027] As a preferred technical solution, a feed box is provided on the frame, and the feed box is connected to the feed port; a material mixing baffle is provided in the feed box, and a ore box flushing pipe is provided in the feed box;

[0028] And / or, feed flushing pipes are provided on both sides of the feed inlet;

[0029] And / or, the frame is provided with a concentrate tank connected to the magnetic material discharge port;

[0030] And / or, a discharging scraper and a concentrate washing pipe are provided on the frame at a position above the tank body;

[0031] And / or, a tailings trough connected to the tailings discharge outlet is provided on the frame, a non-magnetic material discharge port is provided at the bottom of the tailings trough; an overflow trough is provided on one side of the tailings trough, an overflow weir is provided between the tailings trough and the overflow trough, and an overflow discharge port is provided at the bottom of the overflow trough;

[0032] And / or, a protruding leak-proof block is provided at a position of the lower arc-shaped groove corresponding to the scanning area, and two leak-proof blocks are provided, and the two leak-proof blocks are respectively located at two ends of the drum;

[0033] And / or, both sides of the lower arc-shaped groove are provided with groove bottom flushing pipes;

[0034] And / or, a straight extension plate is provided at one end of the lower arc-shaped groove away from the feed port.

[0035] As a preferred technical solution, the center of the upper arc groove is not located on the axis of the roller, and the width of the gap between the upper arc groove and the roller gradually decreases in the direction from the feed inlet to the magnetic material discharge outlet;

[0036] And / or, the center of the lower arc-shaped groove is not located on the axis of the drum, and the width of the gap between the lower arc-shaped groove and the drum gradually decreases in the direction from the feed inlet to the tailings discharge outlet.

[0037] As a preferred technical solution, the upper tooth-shaped inductive magnetic medium and the lower tooth-shaped inductive magnetic medium both include a plurality of convex teeth, the plurality of convex teeth are distributed along the circumference of the drum, and the tooth tips of the convex teeth are arc-shaped.

[0038] As a preferred technical solution, the material of the upper tooth-shaped inductive magnetic medium and the lower tooth-shaped inductive magnetic medium are both set to magnetically conductive stainless steel;

[0039] And / or, the material of the trough body is set to be austenitic stainless steel.

[0040] The beneficial effects of the present invention are as follows:

[0041] 1. The present invention utilizes the magnetic field energy generated by the magnetic system to adsorb the magnetic material in the ore pulp to the drum surface, and the drum rotates to bring the magnetic material out from the magnetic material discharge port. In addition, an upper tooth-shaped induction magnetic medium is provided above the feed port, and a lower tooth-shaped induction magnetic medium is provided below the feed port. The upper tooth-shaped induction magnetic medium and the lower tooth-shaped induction magnetic medium can generate an induced magnetic field to form a magnetic curtain under the action of the external magnetic field of the magnetic system, which can change the magnetic circuit and magnetic force line state of the magnetic system, compensate for the magnetic field depth of the recovery zone, and overcome the defects of the fluid slit at the feed port, thereby enhancing the surface treatment of the drum. The magnetic field energy increases the ability to capture magnetic materials, which is beneficial to widen the feed particle size range and reduce the influence of slurry concentration and slurry volume fluctuation on the recovery effect; in addition, the upper tooth-shaped induction magnetic medium can prevent the backflow of magnetic materials, and the lower tooth-shaped induction magnetic medium can prevent the escape of magnetic materials, effectively improving the recovery rate of magnetic materials and avoiding the occurrence of running, bubbling, dripping and leakage of magnetic materials. The recovery rate of magnetic materials is increased to more than 99.98%, the feed slurry concentration can reach 35%, the particle size is 0-6mm, the single-machine processing capacity can be increased by 10%, and the operation is stable.

[0042] 2. A gap is formed between the roller and the trough body of the present invention, and the gap is divided into a discharge area, a sorting area, a recovery area and a scavenging area according to the position of the feed port. The trough body structure is scientific and reasonable, and the magnetic material in the ore pulp can be fully recovered; the magnetic system is composed of a certain number of main magnetic poles and auxiliary magnetic poles arranged in a fan-shaped structure, which is used to provide the magnetic field energy required for recovering the magnetic material. The magnetic field energy is generally reflected by the magnetic field intensity, the magnetic field gradient, and the magnetic field depth; when fine or micro-particles of magnetic material enter the magnetic field generated by the magnetic system, they are oriented along the magnetic lines of force to form magnetic chains or magnetic beams, and the magnetic chains have a good effect on the recovery of fine particles; the magnetic field intensity generated by the magnetic system is much higher than the coercive force of the magnetic material, and can effectively attract the magnetic material and generate magnetic chains; the magnetic system adopts a composite magnetic system with ferrite and neodymium iron boron as magnetic materials, which increases the pole face width, increases the pole pitch and pole group height, and strengthens the auxiliary magnetic poles. While generating high magnetic field energy, the length of the scavenging area is increased, so that the magnetic material can be fully recovered. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a front view of a magnetic separator for coal washing of the present invention;

[0044] Figure 2 for Figure 1 Side view of

[0045] Figure 3 for Figure 1 A top view of

[0046] Figure 4 for Figure 1 A cross-sectional view of the drum in FIG.

[0047] Figure 5 for Figure 4 Cross-section along the AA direction;

[0048] Figure 6 for Figure 5 Schematic diagram of the distribution of the magnetic system in;

[0049] Figure 7 for Figure 6 A cross-sectional view of the secondary magnetic pole in FIG.

[0050] Figure 8 for Figure 1 A cross-sectional view of the middle portion of the tank body;

[0051] Fig. 9 for Figure 1 A cross-sectional view of one end of the tank body;

[0052] Fig.10 It is a working principle diagram of the present invention.

[0053] In the figure: 1-frame, 11-middle axis, 12-support seat, 13-adjusting pad, 14-reduction motor, 15-feeding box, 151-sizing baffle, 152-ore box flushing pipe, 16-concentrate trough, 161-discharging scraper, 162-concentrate flushing pipe, 17-tailing trough, 171-overflow weir, 18-overflow trough, 2-trough body, 21-feeding port, 211-feeding flushing pipe, 22-upper arc trough, 23-lower arc trough, 231-leakage prevention Block, 232-bottom flushing pipe, 233-straight extension plate, 24-upper toothed induction magnetic medium, 25-lower toothed induction magnetic medium, 3-drum, 31-cylinder, 32-end cover, 4-gap, 41-magnetic material discharge outlet, 42-tailings discharge outlet, 43-sorting area, 44-unloading area, 45-recovery area, 46-sweeping area, 5-magnetic system, 51-first main magnetic pole, 52-second main magnetic pole, 53-third main magnetic pole, 54-auxiliary magnetic pole. DETAILED DESCRIPTION

[0054] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0055] Please refer to Figure 1-Figure 10, is an embodiment of a magnetic separator for coal washing provided by the present invention, comprising a frame 1, a tank body 2 is mounted on the frame 1, a drum 3 is rotatably arranged on the frame 1, the drum 3 is located above the tank body 2, a gap 4 is formed between the drum 3 and the tank body 2, a feed port 21 is provided on the tank body 2, and the slurry enters the gap 4 through the feed port 21 and flows along the extension direction of the gap 4;

[0056] The magnetic system 5 is arranged in the drum 3 and fixedly connected to the frame 1. The magnetic system 5 is arranged close to the gap 4 and distributed along the extension direction of the gap 4. The magnetic wrap angle of the magnetic system 5 is not less than the radian of the gap 4, ensuring that the magnetic field energy generated by the magnetic system 5 can adsorb the magnetic substances in the slurry to the surface of the drum 3. The magnetic wrap angle of the magnetic system 5 is the central angle between the two edges of the outer layer of the magnetic system 5, and the radian of the gap 4 is the central angle between the two edges of the gap 4. At the gap 4, the rotation direction of the outer peripheral surface of the drum 3 is opposite to the flow direction of the slurry. The slurry in the gap 4 can fully and continuously contact the outer peripheral surface of the drum 3. The magnetic substances adsorbed to the outer peripheral surface of the drum 3 can move to the magnetic substance discharge port 41 at one end of the gap 4 above the feed port 21 for discharge, and the selected slurry can flow along the gap 4 and be discharged from the tailings discharge port 42 at the other end. The height of the magnetic substance discharge port 41 should be higher than the height of the tailings discharge port 42 to ensure that the slurry flows in the direction from the feed port 21 to the tailings discharge port 42.

[0057] The trough body 2 includes an upper arc-shaped groove 22 located above the feed port 21 and a lower arc-shaped groove 23 located below the feed port 21; an upper tooth-shaped inductive magnetic medium 24 is provided at a position of the upper arc-shaped groove 22 close to the feed port 21, and a lower tooth-shaped inductive magnetic medium 25 is provided at a position of the lower arc-shaped groove 23 close to the feed port 21. Under the action of the external magnetic field of the magnetic system 5, the upper tooth-shaped inductive magnetic medium 24 and the lower tooth-shaped inductive magnetic medium 25 can generate an induced magnetic field to form a magnetic curtain, which can change the state of the magnetic circuit and magnetic lines of force near it, thereby enhancing the magnetic field energy at the surface of the drum 3, increasing the ability to capture and capture magnetic objects, and preventing the magnetic objects from flowing back and escaping.

[0058] Need to explain, Fig.10 The arrow direction in FIG. 1 is the flow direction of the slurry in the present invention and the rotation direction of the drum 3 .

[0059] In this embodiment, please refer to Figure 8-Figure 10 The upper tooth-shaped inductive magnetic medium 24 and the lower tooth-shaped inductive magnetic medium 25 both include a plurality of convex teeth, which are distributed along the circumference of the drum 3. The tooth tips of the convex teeth are arc-shaped, which avoids magnetic saturation at the tooth tips and can generate a higher magnetic field strength.

[0060] It should be noted that the material of the upper tooth-shaped inductive magnetic medium 24 and the lower tooth-shaped inductive magnetic medium 25 should be set to magnetic stainless steel, specifically ferritic stainless steel. When ferritic stainless steel is in an external magnetic field, it can generate an induced magnetic field. When the external magnetic field disappears, the induced magnetic field will disappear accordingly. That is, the upper tooth-shaped inductive magnetic medium 24 and the lower tooth-shaped inductive magnetic medium 25 can generate an induced magnetic field to form a magnetic curtain under the external magnetic field generated by the magnetic system 5, but will not be magnetized, thereby avoiding blockage in the sorting area 43 and a reduced recovery rate of magnetic materials; at the same time, the material of the trough body 2 should be set to austenitic stainless steel. Austenitic stainless steel is a non-magnetic material, which can reduce the leakage of the magnetic system 5 and reduce the attenuation of the magnetic field, and can also prevent the recovered magnetic materials from being adsorbed on the trough body 2, thereby reducing the impact on the recovery of the magnetic materials.

[0061] For further information, please refer to Fig.10 The center of the upper arc groove 22 is not located on the axis of the drum 3, and the width of the gap 4 between the upper arc groove 22 and the drum 3 gradually decreases in the direction from the feed port 21 to the magnetic material discharge port 41, that is, the upper arc groove 22 and the drum 3 form a trumpet-shaped shape, and its closing end is located at the magnetic material discharge port 41, which can prevent the magnetic material unloaded from the surface of the drum 3 from blocking the magnetic material discharge port 41, affecting the recovery effect and processing capacity; similarly, the center of the lower arc groove 23 is not located on the axis of the drum 3, and the width of the gap 4 between the lower arc groove 23 and the drum 3 gradually decreases in the direction from the feed port 21 to the tailings discharge port 42, that is, the lower arc groove 23 and the drum 3 form a trumpet-shaped shape, and its closing end is located at the tailings discharge port 42, which can lengthen the lower arc groove 23 and extend the length of the scavenging zone 46, so that the fine particles and weak magnetic materials can be fully recovered and will not be discharged from the tailings discharge port 42.

[0062] For details, please refer to Figure 6 The magnetic wrap angle α of the magnetic system 5 is preferably set to 150°.

[0063] The pole pitch of the magnetic system 5 of the existing magnetic separator is small. The magnetic field force is very large at the pole surface and very close to the pole surface, but the magnetic field force will drop rapidly at a slightly farther distance from the pole surface, that is, the magnetic field depth is small; theoretical analysis and practice have proved that large pole moments and auxiliary magnetic poles can effectively increase the magnetic field depth; the magnetic field gradient is the rate of change of the magnetic field intensity with spatial displacement, and a large magnetic field gradient can obtain a larger magnetic adsorption force; therefore, the magnetic poles made of neodymium iron boron material have high magnetic field energy (high magnetic field intensity, high magnetic field gradient and high magnetic field depth), which is conducive to forming magnetic chain of magnetic objects, promoting the recovery of magnetic objects, and is conducive to increasing the feed particle size and increasing the processing capacity of a single machine. In addition, the level of magnetic field energy is related to the magnetic material, shape and arrangement of the magnetic poles.

[0064] In this embodiment, please refer to Fig.10, the area between the gap 4 located between the feed port 21 and the magnetic material discharge port 41 is provided with a sorting area 43 and a discharging area 44 in sequence, the area between the gap 4 located between the feed port 21 and the tailings discharge port 42 is provided with a recovery area 45 and a scavenging area 46 in sequence, in the recovery area 45, the magnetic material can be adsorbed to the surface of the drum 3, in the sorting area 43, the magnetic material on the surface of the drum 3 can be further selected and discarded, in the discharging area 44, the magnetic material can be lifted to the magnetic material discharge port 41 and discharged from the tank body 2, and in the scavenging area 46, the magnetic material leaked from the tailings can be further recovered; the upper tooth-shaped inductive magnetic medium 24 is arranged at the sorting area 43, after the magnetic material adsorbed on the surface of the drum 3 enters the sorting area 43, the magnetic material will generate an oblique downward component force under the influence of its own gravity, and has a tendency to fall back to the feed port 21. If the magnetic material falls back to the feed port 21, it will hinder the recovery of the magnetic material that continues to enter, affecting the recovery effect and the processing capacity of the magnetic separator, and the upper tooth-shaped inductive magnetic medium The magnetic screen formed by the mass 24 under the action of the magnetic system 5 can prevent the magnetic material that has entered the sorting area 43 from flowing back to the recovery area 45, and, in the sorting area 43, the magnetic field energy generated by the magnetic system 5 will decrease as the distance from the drum surface increases, which will reduce the ability to capture magnetic materials. The magnetic screen formed by the interaction between the upper toothed inductive magnetic medium 24 and the magnetic system 5 can change the state of the magnetic lines of force, enhance the magnetic field energy on the surface of the drum 3, and increase the ability to capture magnetic materials, thereby preventing the magnetic materials from flowing back. Similarly, the lower toothed inductive magnetic medium 25 is arranged in the recovery area 45. The magnetic screen generated by the interaction between the lower toothed inductive magnetic medium 25 and the magnetic system 5 will prevent the magnetic materials entering from the feed port 21 from entering the scanning area 46, increase the retention time of the magnetic materials in the recovery area 45, and can also increase the magnetic field energy on the surface of the drum 3, enhance the capture effect on the magnetic materials, so that the magnetic materials are recovered as much as possible in the recovery area 45 to prevent the magnetic materials from escaping.

[0065] Based on the above examples, please refer to Figure 5 and Figure 6The magnetic system 5 includes four first main magnetic poles 51, one second main magnetic pole 52, two third main magnetic poles 53 and three auxiliary magnetic poles 54; the second main magnetic pole 52 is arranged near the unloading area 44, and can lift the magnetic material from the sorting area 43 to the outside of the tank body 2, and mainly plays the function of unloading ore, and is an unloading magnetic pole; a first main magnetic pole 51 is arranged near the sorting area 43, and can further select and discard the recovered magnetic material, and mainly plays the function of sorting magnetic material, and is a sorting magnetic pole; a third main magnetic pole 53 is arranged opposite to the feed port 21, and another third main magnetic pole 53 is arranged near the recovery area 45, and can more effectively capture the magnetic material that has just entered the tank body 2, and is the main It has the function of recovering magnetic materials, and is a recovery pole; the other three first main magnetic poles 51 are arranged close to the scanning area 46, and can further recover the magnetic materials leaking from the recovery area 45, and mainly have the function of scanning magnetic materials, and are scanning poles; an auxiliary magnetic pole 54 is arranged between the adjacent second main magnetic pole 52 and the first main magnetic pole 51, and the other two auxiliary magnetic poles 54 are arranged between the three adjacent first main magnetic poles 51; in other embodiments, the number and arrangement of the first main magnetic pole 51, the second main magnetic pole 52, the third main magnetic pole 53 and the auxiliary magnetic pole 54 in the magnetic system 5 can also be other forms, so as to effectively separate the magnetic materials in the ore pulp.

[0066] For clarification, please refer to Figure 5 and Figure 6 The first main magnetic pole 51, the second main magnetic pole 52, the third main magnetic pole 53 and the auxiliary magnetic pole 54 in the magnetic system 5 are distributed in a fan shape, so that the magnetic system 5 has a higher magnetic field energy, which makes it easy for the magnetic material to form a magnetic beam and a magnetic chain, promotes the recovery of the magnetic material, and improves the recovery effect; and the polarities of the pole faces of adjacent main magnetic poles are oppositely arranged, and the polarities of the two ends of the auxiliary magnetic pole 54 embedded in the adjacent main magnetic pole are the same as the polarities of the pole faces of the adjacent main magnetic poles, which can make the magnetic material adsorbed on the surface of the drum 3 roll when passing through the adjacent main magnetic poles, and can make the non-magnetic material doped in the magnetic material separate, realize the selection and tailing, and improve the grade of the selected magnetic material; at the same time, the magnetic material adhering to the drum 3 is more easily unloaded in the unloading area 44 and under the action of the second main magnetic pole 52, and enters the concentrate tank 16.

[0067] Specifically, the cross-sections of the first main magnetic pole 51, the second main magnetic pole 52 and the third main magnetic pole 53 are preferably rectangular, the pole face widths of the first main magnetic pole 51 and the second main magnetic pole 52 are preferably set to 135 mm, the pole pitches of the first main magnetic pole 51 and the second main magnetic pole 52 are preferably set to 210 mm, the pole group height of the first main magnetic pole 51 is preferably set to 140 mm, and the pole group height of the second main magnetic pole 52 is preferably set to 90 mm; the pole face width of the third main magnetic pole 53 is preferably set to 100 mm, the pole group height is preferably set to 30 mm, and the pole pitch is preferably set to 130 mm.

[0068] For further information, please refer to Figure 6 and Figure 7 The cross section of the secondary magnetic pole 54 is preferably an isosceles trapezoid, and the magnetization direction of the secondary magnetic pole 54 is perpendicular to the center line of the isosceles trapezoid.

[0069] Furthermore, the first main magnetic pole 51 , the second main magnetic pole 52 and the auxiliary magnetic pole 54 are preferably made of ferrite magnetic material; the third main magnetic pole 53 is preferably made of neodymium iron boron magnetic material.

[0070] In this embodiment, please refer to Figure 1-Figure 4 The drum 3 includes a cylinder 31, and end covers 32 are provided at both ends of the cylinder 31; a central axis 11 is provided on the frame 1, and the central axis 11 passes through the cylinder 31 and is respectively rotatably connected to the centers of the two end covers 32, and the central axis 11 is located on the axis of the cylinder 31. A reduction motor 14 is provided on the frame 1, and the reduction motor 14 is transmission-connected to the drum 3, and can drive the cylinder 31 to rotate around the central axis 11; at the same time, the magnetic system 5 is fixed on the central axis 11 to ensure that the magnetic system 5 can generate a stable magnetic field at the gap 4, and a magnetic system adjustment component is installed at the end of one end of the central axis 11, and the central axis 11 can be rotated by the magnetic system adjustment component, and the magnetic system 5 rotates with the central axis 11, thereby adjusting the position of the magnetic system 5.

[0071] Based on the above examples, please refer to Figure 1-Figure 4 A support seat 12 is provided at both ends of the frame 1 corresponding to the central axis 11, which can fix the central axis 11; an adjustment pad 13 is provided between the support seat 12 and the frame 1, and the width of the gap 4 between the drum 3 and the trough body 2 can be adjusted by adjusting the thickness of the adjustment pad 13, which can adapt to different types or specifications of slurries.

[0072] Specifically, the central shaft 11 and the end cover 32 are preferably rotatably connected via a bearing.

[0073] It should be noted that the material of the end cover 32 is preferably set to austenitic stainless steel or aluminum alloy; the cylinder 31 is preferably set to a nested structure of two layers of cylinder skins, and the material of the two layers of cylinder skins is set to austenitic stainless steel. The outer layer of the cylinder skin can protect the inner layer of the cylinder skin from wear and corrosion by the slurry, which is convenient for replacement; austenitic stainless steel and aluminum alloy are non-magnetic conductive materials. The end cover 32 and the cylinder 31 are made of this material to reduce the leakage of the magnetic system 5, reduce the attenuation of the magnetic field, and prevent the recovered magnetic materials from being adsorbed on the end cover 32 and the cylinder, thereby reducing the impact on the recovery of the magnetic materials; and the reduction motor 14 is a variable frequency motor, and the speed of the drum 3 can be adjusted by the variable frequency motor to adapt to changes in the processing volume and improve the unloading efficiency; the frame 1 should also be provided with an overload protection component to prevent the main power line from overheating and damage; in other embodiments, the materials of the two layers of cylinder skins can also be set to austenitic stainless steel and wear-resistant rubber respectively, so as to effectively increase the service life of the cylinder 31.

[0074] In this embodiment, please refer to Figure 8-Figure 10 A feeding box 15 is provided on the frame 1, and the feeding box 15 is connected to the feed port 21. The slurry in the feeding box 15 can flow into the gap 4 from the feed port 21 continuously and stably; a material leveling baffle 151 is provided in the feeding box 15, and the material leveling baffle 151 is T-shaped, which can make the slurry evenly distributed and prevent large pieces of material from entering the gap 4.

[0075] Based on the above examples, please refer to Figure 8-Figure 10 A concentrate trough 16 connected to the magnetic material discharge port 41 is provided on the frame 1. The concentrate trough 16 is a channel for the recovered magnetic materials. The recovered magnetic materials enter the concentrate trough 16 and are discharged. At the same time, a discharge scraper 161 and a concentrate flushing pipe 162 are provided on the frame 1 at a position above the trough body 2 and corresponding to the magnetic material discharge port 41. The discharge scraper 161 and the cleaning water sprayed from the concentrate flushing pipe 162 can work together to scrape off and flush the magnetic materials on the surface of the drum 3, so that the magnetic materials enter the concentrate trough 16.

[0076] For further information, please refer to Fig. 9 and Fig.10 , a protruding leak-proof block 231 is provided at the position of the lower arc groove 23 corresponding to the scanning area 46, and two leak-proof blocks 231 are provided, and the two leak-proof blocks 231 are respectively located at the two ends of the drum 3. The leak-proof blocks 231 can fill the cavities formed by the two ends of the drum 3 and the two ends of the lower arc groove 23, so that the slurry entering the trough body 2 can fully recover the magnetic material, and the phenomenon of magnetic material running, bubbling, dripping and leaking is eliminated; at the same time, the end of the lower arc groove 23 away from the feed port 21 is preferably provided with a straight extension plate 233, and the straight extension plate 233 increases the height between the magnetic pole located at the end of the scanning area 46 and the overflow liquid level, so that the magnetic material that is not completely discharged and remains on the surface of the drum 3 can be recovered again, and the scanning path of the slurry can be increased, so that the magnetic material in the slurry can be fully recovered.

[0077] For further information, please refer to Figure 8-Figure 10 A tailings trough 17 connected to the tailings discharge port 42 is provided on the frame 1, and a non-magnetic material discharge port is provided at the bottom of the tailings trough 17. The slurry after the magnetic material is recovered enters the tailings trough 17, and then is discharged from the tailings trough 17 through the non-magnetic material discharge port after being deposited to form tailings of a certain concentration; an overflow trough 18 is provided on one side of the tailings trough 17, an overflow weir 171 is provided between the tailings trough 17 and the overflow trough 18, and an overflow discharge port is provided at the bottom of the overflow trough 18, and the overflow weir 171 separates the tailings trough 17 and the overflow trough 18, and the overflow water in the tailings trough 17 flows over the overflow weir 171 into the overflow trough 18, and is discharged from the overflow trough 18 through the overflow discharge port.

[0078] It should be noted that in order to ensure structural strength and service life, the feed box 15, the concentrate trough 16, the upper arc trough 22, the lower arc trough 23, the tailings trough 17 and the overflow trough 18 are preferably configured as an integrally formed structure; at the same time, the discharge ports of the concentrate trough 16, the tailings trough 17 and the overflow trough 18 and each flushing pipe can be installed with solenoid valves to achieve automatic switching.

[0079] For details, please refer to Figure 8 A ore box flushing pipe 152 is provided in the feed box 15. When blockage occurs in the feed box 15, flushing water enters the feed box 15 from the flushing pipe of the feed box 15 to flush the feed box 15; similarly, feed flushing pipes 211 are provided on both sides of the feed port 21, and groove bottom flushing pipes 232 are provided on both sides of the lower arc-shaped groove 23. When blockage occurs in the feed port 21 and the lower arc-shaped groove 23, flushing water can enter from the feed flushing pipe 211 and the groove bottom flushing pipe 232 respectively to prevent blockage of the ore slurry.

[0080] Please refer to Figure 1-Figure 10 , the specific working principle of the present invention is as follows:

[0081] The ore slurry is injected into the ore feeding box 15 equipped with the material leveling baffle 151. The material leveling baffle 151 filters out the large particles in the ore slurry and evenly distributes the ore slurry, so that the ore slurry enters the recovery area 45 of the gap 4 from the feed port 21 of the tank body 2;

[0082] At the recovery area 45, most of the magnetic substances in the ore pulp are adsorbed to the surface of the drum 3 under the combined action of the magnetic field generated by the recovery magnetic pole and the induced magnetic field generated by the recovery magnetic pole and the lower tooth-shaped inductive magnetic medium 25. The magnetic substances adsorbed on the surface of the drum 3 rotate with the drum 3 to the separation area 43. While the magnetic substances roll along the surface of the drum 3 to achieve separation and tailing, the induced magnetic field generated by the separation magnetic pole and the upper tooth-shaped inductive magnetic medium 24 can prevent the magnetic substances that have entered the separation area 43 from flowing back to the recovery area 45. The magnetic substances adsorbed on the surface of the drum 3 continue to rotate with the drum 3 to the unloading area 44. Under the action of the unloading scraper 161 and the concentrate washing pipe 162, the magnetic substances are separated from the surface of the drum 3 at the magnetic substance discharge port 41 and flow out of the concentrate tank 16.

[0083] The magnetic material not recovered in the recovery area 45 flows with the slurry along the gap 4 to the scavenging area 46, and is adsorbed to the surface of the drum 3 under the action of the scavenging magnetic pole, and then rotates with the drum 3, passes through the recovery area 45, the separation area 43 and the discharge area 44 in sequence, and then enters the concentrate tank 16;

[0084] The sorted slurry is discharged into the tailings trough 17 from the tailings discharge port 42. An overflow weir 171 of a certain height is provided between the tailings trough 17 and the overflow trough 18 to ensure that the drum 3 has a certain immersion depth in the slurry. Tailings with larger particle size and density are discharged from the non-magnetic material discharge port of the tailings trough 17, and a mixture of some fine-grained coal slime and water flows out from the overflow discharge port of the overflow trough 18.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A magnetic separator for coal washing, characterized in that: include: A frame (1), wherein a trough body (2) is mounted on the frame (1); a feed port (21) is provided on the trough body (2); the trough body (2) comprises an upper arc-shaped trough (22) located above the feed port (21) and a lower arc-shaped trough (23) located below the feed port (21); an upper tooth-shaped inductive magnetic medium (24) is provided at a position of the upper arc-shaped trough (22) close to the feed port (21), and a lower tooth-shaped inductive magnetic medium (25) is provided at a position of the lower arc-shaped trough (23) close to the feed port (21); A roller (3), wherein the roller (3) is rotatably arranged on the frame (1), the roller (3) is located above the tank body (2), a gap (4) is formed between the roller (3) and the tank body (2), and the slurry can flow in the gap (4); at the gap (4), the rotation direction of the outer peripheral surface of the roller (3) is opposite to the flow direction of the slurry; one end of the gap (4) located above the feed inlet (21) forms a magnetic material discharge outlet (41), and the other end of the gap (4) forms a tailings discharge outlet (42); the gap (4) is located between the feed inlet (21) and the magnetic material discharge outlet (42); The area between the discharge ports (41) is provided with a sorting area (43) and a discharge area (44) in sequence, and the area of ​​the gap (4) located between the feed port (21) and the tailings discharge port (42) is provided with a recovery area (45) and a scavenging area (46) in sequence; the upper tooth-shaped inductive magnetic medium (24) is provided at the sorting area (43), and the lower tooth-shaped inductive magnetic medium (25) is provided at the recovery area (45); the upper tooth-shaped inductive magnetic medium (24) and the lower tooth-shaped inductive magnetic medium (25) both include a plurality of convex teeth, the plurality of convex teeth are distributed along the circumference of the drum (3), and the tooth tips of the convex teeth are arc-shaped; A magnetic system (5), wherein the magnetic system (5) is arranged in the drum (3) and fixedly connected to the frame (1); the magnetic system (5) is arranged close to the gap (4) and distributed along the extension direction of the gap (4); with the axis of the drum (3) as the center of the circle, the magnetic wrap angle of the magnetic system (5) is not less than the arc of the gap (4); the magnetic wrap angle of the magnetic system (5) is set to 150°.

2. A magnetic separator for coal washing according to claim 1, characterized in that: The magnetic system (5) comprises four first main magnetic poles (51), one second main magnetic pole (52), two third main magnetic poles (53) and three auxiliary magnetic poles (54); the second main magnetic pole (52) is arranged close to the unloading area (44), one first main magnetic pole (51) is arranged close to the sorting area (43), one third main magnetic pole (53) is arranged directly opposite to the feed port (21), one third main magnetic pole (53) is arranged close to the recovery area (45), three first main magnetic poles (51) are arranged close to the scanning area (46), and the three auxiliary magnetic poles (54) are respectively arranged between adjacent second main magnetic poles (52) and first main magnetic poles (51) and between adjacent first main magnetic poles (51).

3. A magnetic separator for coal washing according to claim 2, characterized in that: The first main magnetic pole (51), the second main magnetic pole (52), the third main magnetic pole (53) and the auxiliary magnetic pole (54) in the magnetic system (5) are distributed in a fan shape; And / or, the first main magnetic pole (51), the second main magnetic pole (52) and the auxiliary magnetic pole (54) are all made of ferrite magnetic material; And / or, the pole face widths of the first main magnetic pole (51) and the second main magnetic pole (52) are both set to 135 mm, the pole pitches of the first main magnetic pole (51) and the second main magnetic pole (52) are both set to 210 mm, the pole group height of the first main magnetic pole (51) is set to 140 mm, and the pole group height of the second main magnetic pole (52) is set to 90 mm; And / or, the third main magnetic pole (53) is made of neodymium iron boron magnetic material; And / or, the pole face width of the third main magnetic pole (53) is set to 100 mm, the pole group height is set to 30 mm, and the magnetic pole pitch is set to 130 mm; And / or, the cross section of the secondary magnetic pole (54) is an isosceles trapezoid, and the magnetization direction of the secondary magnetic pole (54) is perpendicular to the midline of the isosceles trapezoid.

4. A magnetic separator for coal washing according to claim 1, characterized in that: The drum (3) comprises a cylinder (31), and both ends of the cylinder (31) are provided with end covers (32); a central axis (11) is provided on the frame (1), and the central axis (11) passes through the cylinder (31) and is rotatably connected to the centers of the two end covers (32), respectively; and the magnetic system (5) is fixed on the central axis (11).

5. A magnetic separator for coal washing according to claim 4, characterized in that: Support seats (12) are provided on the frame (1) at both ends corresponding to the central axis (11), and an adjustment pad (13) is provided between the support seat (12) and the frame (1); And / or, the central shaft (11) and the end cover (32) are rotatably connected via a bearing; And / or, a reduction motor (14) is provided on the frame (1), and the reduction motor (14) is drivingly connected to the roller (3); And / or, the cylinder (31) is configured as a nested structure of two layers of cylinder skins, the material of the two layers of cylinder skins are both austenitic stainless steel, or the material of one layer of cylinder skin is austenitic stainless steel and the material of the other layer of cylinder skin is wear-resistant rubber; And / or, the material of the end cover (32) is set to be austenitic stainless steel or aluminum alloy.

6. A magnetic separator for coal washing according to claim 1, characterized in that: The frame (1) is provided with an ore feeding box (15), and the ore feeding box (15) is in communication with the feed port (21); a material leveling baffle (151) is provided in the ore feeding box (15), and an ore box flushing pipe (152) is provided in the ore feeding box (15); And / or, feed flushing pipes (211) are provided on both sides of the feed inlet (21); And / or, the frame (1) is provided with a concentrate tank (16) connected to the magnetic material discharge port (41); And / or, a discharge scraper (161) and a concentrate washing pipe (162) are provided on the frame (1) at a position above the tank body (2); And / or, a tailings trough (17) connected to the tailings discharge outlet (42) is provided on the frame (1), and a non-magnetic material discharge port is provided at the bottom of the tailings trough (17); an overflow trough (18) is provided on one side of the tailings trough (17), an overflow weir (171) is provided between the tailings trough (17) and the overflow trough (18), and an overflow discharge port is provided at the bottom of the overflow trough (18); And / or, a protruding leak-proof block (231) is provided at a position of the lower arc-shaped groove (23) corresponding to the scanning area (46), and two leak-proof blocks (231) are provided, and the two leak-proof blocks (231) are respectively located at two ends of the roller (3); And / or, groove bottom flushing pipes (232) are provided on both sides of the lower arc-shaped groove (23); And / or, a straight extension plate (233) is provided at one end of the lower arc-shaped groove (23) away from the feed port (21).

7. A magnetic separator for coal washing according to claim 1, characterized in that: The center of the upper arc-shaped groove (22) is not located on the axis of the roller (3), and the width of the gap (4) between the upper arc-shaped groove (22) and the roller (3) gradually decreases in the direction from the feed port (21) to the magnetic material discharge port (41); And / or, the center of the lower arc-shaped groove (23) is not located on the axis of the drum (3), and the width of the gap (4) between the lower arc-shaped groove (23) and the drum (3) gradually decreases in the direction from the feed port (21) to the tailings discharge port (42).

8. A magnetic separator for coal washing according to claim 1, characterized in that: The material of the upper tooth-shaped inductive magnetic medium (24) and the lower tooth-shaped inductive magnetic medium (25) are both magnetically conductive stainless steel; And / or, the material of the tank body (2) is set to be austenitic stainless steel.

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