Large electromagnetic slurry magnetic separator

Abstract

The invention discloses a large electromagnetic slurry magnetic separator, and belongs to the technical field of magnetic separation equipment. The magnetic separation assembly comprises a bottom plate and a plurality of nested positioning cylinders, and the space between every two adjacent positioning cylinders is filled with a magnetic medium; a plurality of first through holes are formed in the bottom plate; a plurality of second through holes are formed in the circumferential surface of the positioning cylinder; the pre-magnetization cavity extends into the innermost positioning cylinder and is connected with a feeding pipe and a water inlet pipe, and a plurality of excitation rings are arranged in the pre-magnetization cavity; the driving assembly can drive the magnetic separation assembly to rotate; the magnetic separation assembly is positioned in the material barrel; a discharging pipeline is arranged at the bottom of the material barrel; the magnet exciting coil is arranged around the material barrel; in the magnetic separation stage, ore pulp enters the magnetic separation assembly through the pre-magnetization cavity, the excitation ring can magnetize weakly magnetic particles in the ore pulp, and the magnetized weakly magnetic particles are more easily adsorbed to a magnetic medium; in the iron removal stage, the driving assembly drives the magnetic separation assembly to rotate forwards and backwards, the flushing water can thoroughly clean the magnetic particles adhered to the magnetic medium, and regular disassembly and cleaning are not needed any more.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic separation equipment, and in particular to a large-scale electromagnetic slurry magnetic separator. Background Art

[0002] The advantages of electromagnetic slurry magnetic separators in removing iron from fine-grained non-metallic minerals are very obvious, and can significantly improve the quality of materials. As electromagnetic slurry magnetic separators continue to develop towards large-scale, the requirements for the stability of the equipment's sorting indicators are becoming more and more stringent, and the requirements for equipment operation and maintenance are also becoming higher and higher.

[0003] At present, the magnetic medium of electromagnetic slurry magnetic separator is mainly steel wool medium, diamond mesh medium or rod medium. The magnetic medium is usually placed statically in layers or pieces inside the separation chamber. The slurry passes through the separation chamber under the action of the pump's conveying force and gravity and directly contacts the magnetic medium. Some weak magnetic particles in the slurry are not easy to capture, and with the increase of use time, the magnetic medium is prone to mixed with materials, resulting in the magnetic separation effect will also be worse with the increase of the magnetic medium use cycle, and large particles of impurities are mixed in the magnetic medium, which is easy to cause magnetic medium blockage; this requires regular removal of the magnetic pole head of the large electromagnetic slurry magnetic separator (the single pole weighs about 25 tons), and then take out the magnetic medium and clean it piece by piece and then reload it into the separation chamber. The large slurry magnetic separator has a long component disassembly cycle, inconvenient component hoisting, and high labor intensity. The magnetic medium cleaning requires two days of downtime, which greatly reduces the working efficiency of the large electromagnetic slurry magnetic separator and seriously restricts the popularization and application of large electromagnetic slurry magnetic separators.

[0004] Therefore, developing and designing a large-scale electromagnetic slurry magnetic separator that can effectively improve the capture probability of weakly magnetic particles and can conveniently clean the magnetic medium is a problem that needs to be solved urgently at this stage. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention provides a large-scale electromagnetic slurry magnetic separator. During the magnetic separation process, the ore pulp enters the magnetic separation assembly through the pre-magnetization chamber. Under the action of the strong magnetic field generated by the excitation coil, the excitation ring in the pre-magnetization chamber can magnetize the weak magnetic particles in the ore pulp. The ore pulp enters the magnetic separation assembly. The rotation of the magnetic separation assembly can make the ore pulp move radially under the action of centrifugal force. The magnetized weak magnetic particles are more easily adsorbed on the magnetic medium in the magnetic separation assembly, thereby improving the concentrate index. During the iron removal process, the driving component drives the magnetic separation assembly to rotate forward and reverse periodically. Under the action of centrifugal force, the flushing water can effectively clean the magnetic particles adhering to the magnetic medium. The magnetic medium will not have problems of mixed material and blockage. The magnetic medium no longer needs to be disassembled and cleaned regularly, thereby improving work efficiency.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows: The present invention provides a large-scale electromagnetic slurry magnetic separator, comprising: A frame; A magnetic separation assembly, which is arranged on the frame; the magnetic separation assembly includes a horizontally arranged bottom plate, on which a plurality of vertically arranged and sequentially nested positioning cylinders are provided, and a magnetic medium is filled in the gap between adjacent positioning cylinders; a plurality of first through holes are provided in the area of the bottom plate between adjacent positioning cylinders; a plurality of second through holes are provided on the circumferential surface of the positioning cylinder; A pre-magnetization chamber, one end of which extends into the innermost positioning cylinder, and the other end of the pre-magnetization chamber is connected with a feed pipe and a water inlet pipe; a plurality of exciting rings are arranged in the pre-magnetization chamber, and the exciting rings are located inside the innermost positioning cylinder; A driving assembly, which is fixed on the frame and can drive the magnetic separation assembly to rotate around the axis of the innermost positioning cylinder; A material cylinder, which is arranged on the frame, and the magnetic separation assembly is located inside the material cylinder; the bottom of the material cylinder has a discharge pipeline; An exciting coil, which is fixed on the frame and arranged around the material cylinder.

[0007] As a preferred technical solution, there is a gap between the inner bottom surface of the material cylinder and the bottom surface of the bottom plate, a flow disturbing plate is arranged on the inner bottom surface of the material cylinder, the upper surface of the flow disturbing plate is a conical surface, and corrugated strips are arranged on the conical surface.

[0008] As a preferred technical solution, the driving assembly includes a vertically arranged transmission shaft, the upper end of the transmission shaft sequentially passes through the material cylinder and the flow disturbing plate and is fixedly connected with the bottom plate, and the lower end of the transmission shaft is connected with a motor capable of driving it to rotate.

[0009] As a preferred technical solution, a sleeve is sleeved outside the transmission shaft, the sleeve is in clearance fit with the transmission shaft, the upper end of the sleeve is fixedly connected with the bottom surface of the flow disturbing plate, and the lower end of the sleeve is fixedly connected with the frame; the upper end and the lower end of the sleeve are rotationally and sealingly connected with the transmission shaft; an exhaust port and a fuel filling port are arranged on the sleeve; the fuel filling port is located at the bottom of the sleeve, and the part of the transmission shaft located inside the sleeve has an external thread.

[0010] As a preferred technical solution, a plurality of vertically arranged convex ribs are arranged on the inner circumferential surface of the material cylinder.

[0011] As a preferred technical solution, a cover plate is provided at the upper end of the material cylinder, an upper connecting pipe is provided on the cover plate, and the pre-magnetization cavity passes through the upper connecting pipe and is in clearance fit with the upper connecting pipe.

[0012] As a preferred technical solution, the exciting ring includes a plurality of parallel dielectric strips and a plurality of parallel connecting strips. The connecting strips are located below the dielectric strips. The dielectric strips are vertically arranged and fixedly connected to each other. Both ends of the connecting strips are fixedly connected to the pre-magnetization cavity. The dielectric strips are made of a magnetic conductive material, and the connecting strips are made of a non-magnetic conductive material. And / or, a plurality of the exciting rings are distributed along the extending direction of the pre-magnetization cavity.

[0013] As a preferred technical solution, both the bottom plate and the positioning cylinder are made of non-magnetic conductive materials. And / or, the bottom plate is circular, and the positioning cylinder located in the outermost layer is fixedly connected to the outer edge of the bottom plate. And / or, the axes of a plurality of the positioning cylinders, the bottom plate, and the pre-magnetization cavity are collinear. And / or, the magnetic medium is set as steel wool medium, diamond mesh medium or rod-shaped medium.

[0014] As a preferred technical solution, the pre-magnetization cavity is vertically arranged, and the feed pipe and the water inlet pipe are both communicated with the upper end of the pre-magnetization cavity. And / or, the discharge pipeline is vertically arranged, and a tailings outlet and a concentrate outlet are respectively provided at the lower end of the discharge pipeline.

[0015] As a preferred technical solution, an upper magnetic pole is provided on the frame corresponding to the position above the material cylinder, and the pre-magnetization cavity passes through the upper magnetic pole. And / or, a lower magnetic pole is provided on the frame corresponding to the position below the material cylinder, and the discharge pipeline passes through the lower magnetic pole.

[0016] The beneficial effects of the present invention are as follows: During the operation of the present invention, the magnetic separation process and the iron removal process are alternately carried out; during the magnetic separation process, the pulp enters the magnetic separation assembly through the pre-magnetization chamber. Under the action of the strong magnetic field generated by the exciting coil, the exciting ring in the pre-magnetization chamber can magnetize the weakly magnetic particles in the pulp. When the pulp enters the magnetic separation assembly, the rotation of the magnetic separation assembly can cause the pulp to move radially under the action of centrifugal force. The magnetized weakly magnetic particles are more likely to be adsorbed onto the magnetic medium in the magnetic separation assembly, which can effectively improve the concentrate index; during the iron removal process, the exciting coil is turned off, the magnetic medium is demagnetized, and the driving assembly drives the magnetic separation assembly to rotate forward and backward periodically. The flushing water can effectively wash the magnetic particles adhered to the magnetic medium under the action of centrifugal force. There will be no problems of inclusion of materials and blockage in the magnetic medium, and the magnetic medium no longer needs to be disassembled and cleaned regularly. The magnetic separation index is more stable, and the working efficiency is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. is a schematic diagram of the overall structure of an embodiment of a large-scale electromagnetic pulp magnetic separator of the present invention; Figure 2 is Figure 1 an enlarged view of area A in Figure 3 is Figure 1 a schematic diagram of the structure of the magnetic separation assembly in after hiding the outermost positioning cylinder; Figure 4 is Figure 1 a schematic diagram of the structure of the pre-magnetization chamber in ; Figure 5 is Figure 4 a schematic diagram of the structure of the exciting ring in ; Figure 6 is Figure 1 a schematic diagram of the structure of the driving assembly in ; Figure 7 is Figure 1 a schematic diagram of the structure of the material cylinder in .

[0018] In the figure: 1 - frame, 11 - upper magnetic pole, 12 - lower magnetic pole, 2 - bottom plate, 21 - first through hole, 3 - positioning cylinder, 31 - second through hole, 4 - pre-magnetization chamber, 41 - feed pipe, 42 - water inlet pipe, 5 - exciting ring, 51 - dielectric strip, 52 - connecting strip, 61 - transmission shaft, 611 - external thread, 62 - motor, 7 - material cylinder, 71 - discharge pipeline, 711 - tailing outlet, 712 - concentrate outlet, 72 - turbulence disk, 73 - sleeve, 731 - exhaust port, 732 - oil filling port, 74 - rib, 75 - cover plate, 76 - upper connecting pipe, 8 - exciting coil. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

[0020] Please refer to Figures 1-7 which is an embodiment of a large electromagnetic pulp magnetic separator provided by the present invention, including a frame 1; a magnetic separation assembly is arranged on the frame 1; the magnetic separation assembly includes a horizontally arranged bottom plate 2, and a plurality of vertically arranged and sequentially nested positioning cylinders 3 are arranged on the bottom plate 2. A magnetic medium (not shown in the figure) is filled in the gap between adjacent positioning cylinders 3; a plurality of first through holes 21 are arranged at the areas of the bottom plate 2 between adjacent positioning cylinders 3; a plurality of second through holes 31 are arranged on the circumferential surface of the positioning cylinder 3; one end of the pre-magnetization cavity 4 extends into the innermost positioning cylinder 3, and the other end of the pre-magnetization cavity 4 is connected with a feed pipe 41 and a water inlet pipe 42; a plurality of exciting rings 5 are arranged in the pre-magnetization cavity 4, and the exciting rings 5 are located inside the innermost positioning cylinder 3. The pulp first enters the pre-magnetization cavity 4, and after passing through the exciting rings 5, it can enter the innermost positioning cylinder 3; the driving assembly is fixed on the frame 1, and the driving assembly can drive the magnetic separation assembly to rotate around the axis of the innermost positioning cylinder 3. When the pulp enters the magnetic separation assembly, the rotation of the magnetic separation assembly can make the pulp move radially under the action of centrifugal force; a material cylinder 7 is arranged on the frame 1, and the magnetic separation assembly is located inside the material cylinder 7; the bottom of the material cylinder 7 has a discharge pipe 71, and the pulp flows into the material cylinder 7 after being sorted by the magnetic separation assembly and can be discharged from the discharge pipe 71; an exciting coil 8 is fixed on the frame 1 and arranged around the material cylinder 7. When the exciting coil 8 is energized, it can generate a strong magnetic field. The strong magnetic field can make the magnetic medium and the exciting rings 5 generate magnetism. The magnetic medium can adsorb magnetic system particles, and the exciting rings 5 can increase the background magnetic field intensity in their nearby areas, improve the magnetization effect on weakly magnetic particles in the pulp, and the magnetized weakly magnetic particles are more easily adsorbed when contacting the magnetic medium.

[0021] It should be noted that the magnetic force lines generated after the exciting coil 8 is energized should be parallel to the axis of the pre-magnetization cavity 4. The magnetic medium is preferably made of steel wool medium, diamond mesh medium or rod-shaped medium made of a magnetic conductive material; correspondingly, the bottom plate 2 and the positioning cylinder 3 are both preferably made of a non-magnetic conductive material; further, a plurality of sequentially nested positioning cylinders 3 can isolate the magnetic medium and form a concentric ring shape. The pulp passes through the magnetic medium between a plurality of positioning cylinders 3 from the inside to the outside in sequence, which can effectively guide the flow direction of the pulp and is also convenient for flushing the magnetic medium.

[0022] Specifically, please refer to Figure 3 wherein the bottom plate 2 is preferably circular, and the outermost positioning cylinder 3 is fixedly connected to the outer edge of the bottom plate 2, making the shape of the magnetic separation assembly concise. After the tailings after sorting flow out from the second through holes 31 on the outermost positioning cylinder 3 and the first through holes 21 on the bottom plate 2, they can directly fall into the material cylinder 7, and it is convenient for production and processing; further, in order to ensure the stability of the magnetic separation assembly during high-speed rotation, the axes of a plurality of positioning cylinders 3, the bottom plate 2 and the pre-magnetization cavity 4 should be collinear.

[0023] In this embodiment, please refer to Figure 1 , Figure 2 and Figure 6 . There is a gap between the inner bottom surface of the material cylinder 7 and the bottom surface of the bottom plate 2. A spoiler plate 72 is provided on the inner bottom surface of the material cylinder 7. The upper surface of the spoiler plate 72 is a conical surface. The discharge pipe 71 is located at the lowest point of the conical surface. After the tailings flowing out from the first through hole 21 fall on the conical surface, they can automatically flow along the conical surface to the discharge pipe 71; further, a plurality of corrugated strips are provided on the conical surface. The plurality of corrugated strips are circumferentially distributed, and each corrugated strip extends radially. The gas at the gap between the inner bottom surface of the material cylinder 7 and the bottom surface of the bottom plate 2 interacts with the corrugated strips when the magnetic separation assembly rotates at a high speed, and can generate an upward pressure at the first through hole 21 of the bottom plate 2, generating resistance to the pulp about to flow out from the first through hole 21, which can increase the residence time of the pulp in the magnetic separation assembly and improve the separation effect.

[0024] Similarly, please refer to Figure 1 , Figure 2 and Figure 7 . A plurality of vertically arranged convex ribs 74 are preferably provided on the inner circumferential surface of the material cylinder 7. When the magnetic separation assembly rotates at a high speed, the convex ribs 74 interact with the gas between the inner circumferential surface of the material cylinder 7 and the outermost positioning cylinder 3, and can generate a radially inward pressure at the second through hole 31 of the outermost positioning cylinder 3, generating resistance to the pulp about to flow out from the second through hole 31, which can also increase the residence time of the pulp in the magnetic separation assembly and improve the separation effect.

[0025] On the basis of the foregoing embodiment, please refer to Figure 1 , Figure 2 and Figure 6 . The drive assembly includes a vertically arranged transmission shaft 61. The upper end of the transmission shaft 61 sequentially passes through the material cylinder 7 and the spoiler plate 72 and is fixedly connected to the center of the bottom plate 2. The lower end of the transmission shaft 61 is connected with a motor 62 capable of driving it to rotate. The motor 62 is preferably a servo motor and can drive the bottom plate 2 to rotate forward and backward through the transmission shaft 61.

[0026] Further, please refer to Figure 1 , Figure 2 and Figure 6, a sleeve 73 is sleeved outside the transmission shaft 61. The sleeve 73 is in clearance fit with the transmission shaft 61. The upper end of the sleeve 73 is fixedly connected to the bottom surface of the spoiler plate 72, and the lower end of the sleeve 73 is fixedly connected to the frame 1. Both the upper end and the lower end of the sleeve 73 are rotationally and sealingly connected to the transmission shaft 61, and the sleeve 73 can effectively protect the transmission shaft 61. The sleeve 73 is provided with an exhaust port 731 and a grease filling port 732. The exhaust port 731 can timely discharge the high-pressure gas between the sleeve 73 and the transmission shaft 61, and the grease filling port 732 can inject grease into the gap between the sleeve 73 and the transmission shaft 61 to improve the lubrication effect. Specifically, the grease filling port 732 is located at the bottom of the sleeve 73 for facilitating the injection of grease. At the same time, the part of the transmission shaft 61 located inside the sleeve 73 has an external thread 611. When the transmission shaft 61 rotates, the rotation of the external thread 611 can drive the grease to move upward accordingly, so that the grease can fully lubricate the part of the transmission shaft 61 located inside the sleeve 73. Further, the opening of the exhaust port 731 located inside the sleeve 73 should be located at the upper end of the sleeve 73, which can effectively prevent the grease from being discharged from the exhaust port 731.

[0027] In this embodiment, please refer to Figure 1 , Figure 2 and Figure 7 , a cover plate 75 is provided at the upper end of the material cylinder 7. The cover plate 75 seals the upper end of the material cylinder 7 and completely accommodates the magnetic separation assembly inside the material cylinder 7 to prevent the tailings flowing out of the magnetic separation assembly from splashing. The cover plate 75 is provided with an upper connecting pipe 76. The pre-magnetization chamber 4 passes through the upper connecting pipe 76 and is in clearance fit with the upper connecting pipe 76, which can guide the pre-magnetization chamber 4 and ensure that the pulp flowing out of the pre-magnetization chamber 4 can all enter the magnetic separation assembly.

[0028] In this embodiment, please refer to Figure 4 and Figure 5 , the exciting ring 5 includes a plurality of parallel dielectric strips 51 and a plurality of parallel connecting strips 52. The connecting strips 52 are located below the dielectric strips 51. The dielectric strips 51 are perpendicularly arranged and fixedly connected to the connecting strips 52. Both ends of the connecting strips 52 are fixedly connected to the pre-magnetization chamber 4, thereby firmly positioning the exciting ring 5 inside the pre-magnetization chamber 4. It should be noted that the dielectric strips 51 should be made of a magnetic conductive material, and the connecting strips 52 should be made of a non-magnetic conductive material. Moreover, a non-metallic material coating with a thickness of 2 - 5 mm is provided on the surface of the dielectric strips 51. While magnetizing the weakly magnetic particles in the pulp, it can prevent the weakly magnetic particles from being adsorbed on the dielectric strips 51, and the exciting ring 5 can increase the background magnetic field intensity in its nearby area by at least 2 times.

[0029] Further, please refer to Figure 4 and Figure 5 , a plurality of exciting rings 5 are preferably distributed along the extending direction of the pre-magnetization chamber 4, and the pulp passes through a plurality of exciting rings 5 in sequence, which can improve the magnetization effect on the weakly magnetic particles in the pulp.

[0030] In this embodiment, please refer to Figure 1 , Figure 2 and Figure 4 . The pre-magnetization chamber 4 is preferably vertically arranged, and the pulp can flow smoothly along the pre-magnetization chamber 4 under the action of gravity; both the feed pipe 41 and the water inlet pipe 42 are communicated with the upper end of the pre-magnetization chamber 4. The pulp can be injected into the pre-magnetization chamber 4 through the feed pipe 41, and the flushing water can enter the magnetic separation assembly through the water inlet pipe 42 and the pre-magnetization chamber 4.

[0031] Similarly, please refer to Figure 1 , Figure 2 and Figure 7 . The discharge pipeline 71 is also preferably vertically arranged, and the sorted tailings and magnetic particles can both flow out smoothly along the discharge pipeline 71; the lower end of the discharge pipeline 71 is respectively provided with a tailings outlet 711 and a concentrate outlet 712. The sorted tailings are discharged from the tailings outlet 711, and the magnetic particles are discharged from the concentrate outlet 712.

[0032] It should be noted that, please refer to Figure 1 . An upper magnetic pole 11 should be provided at the position on the frame 1 corresponding to the upper part of the material cylinder 7. The pre-magnetization chamber 4 passes through the upper magnetic pole 11. When the excitation coil 8 is energized to generate a magnetic field, the part of the pre-magnetization chamber 4 located within the upper magnetic pole 11 will not generate a strong magnetic field, and the magnetic particles in the pulp will not be magnetized, avoiding affecting the flow of the pulp and the subsequent magnetic separation of the magnetic particles; similarly, a lower magnetic pole 12 is provided at the position on the frame 1 corresponding to the lower part of the material cylinder 7. The discharge pipeline 71 passes through the lower magnetic pole 12. When the excitation coil 8 is energized to generate a magnetic field, the part of the discharge pipeline 71 located within the lower magnetic pole 12 will not generate a strong magnetic field, avoiding affecting the discharge of the magnetic particles from the discharge pipeline 71.

[0033] Please refer to Figures 1-7 . The specific working process of the present invention is as follows: During the magnetic separation process, the excitation coil 8 is energized to generate a strong magnetic field, and both the magnetic medium and the excitation ring 5 generate magnetism; the driving assembly drives the magnetic separation assembly to rotate; the pulp enters the pre-magnetization chamber 4 through the feed pipe 41. When passing through the excitation ring 5, the excitation ring 5 is in full contact with the pulp, enabling the weakly magnetic particles in the pulp to be magnetized; the pulp falls from the pre-magnetization chamber 4 into the innermost positioning cylinder 3 of the magnetic separation assembly. Under the action of centrifugal force, the pulp moves radially, passes through the second through-hole 31 of the innermost positioning cylinder 3 and contacts the magnetic medium, and the magnetic particles are adsorbed onto the magnetic medium. Part of the sorted tailings move radially in sequence through all the positioning cylinders 3 and are discharged from the second through-hole 31 of the outermost positioning cylinder 3 out of the magnetic separation assembly, and part of the sorted tailings are discharged from the first through-hole 21 of the bottom plate 2 out of the magnetic separation assembly under the action of gravity; the material cylinder 7 collects the sorted tailings and discharges them from the tailings outlet 711 on the discharge pipeline 71; After feeding for a period of time, close the feed pipe 41 to stop feeding, and at the same time, the driving assembly stops running. Wait for a period of time until no tailings flow out of the discharge pipeline 71, and then the iron removal process can be carried out; During the iron removal process, the exciting coil 8 is powered off, and the flushing water enters the magnetic separation assembly through the water inlet pipe 42 via the pre-magnetization chamber 4. The driving assembly drives the magnetic separation assembly to rotate forward and backward at high speed. Under the combined action of the flushing water and centrifugal force, all the magnetic particles adhering to the magnetic medium can be washed down and flow into the material cylinder 7 through the material pipeline and are discharged from the concentrate outlet 712; the magnetic medium can be fully cleaned and there will be no situation of mixed material carrying or blockage in the magnetic separation process of the next cycle; specifically, the rotation speed of the magnetic separation assembly is preferably controlled at 0 - 350 r / min and is frequency adjustable, and different rotation speeds can be set according to the pulp.

[0034] It should be noted that the first through hole 21 on the bottom plate 2 can effectively prevent the pulp from remaining at the bottom between adjacent positioning cylinders 3, thereby effectively avoiding the situation of mixed material carrying or blockage of the magnetic medium.

[0035] Experimental Example 1 Configure 30 kg of 325-mesh kaolin pulp with a concentration of 15%, divide it into two parts, and conduct experimental comparisons using the same equipment. All beneficiation parameters (background magnetic field 1.5 T, feeding speed 10 mm / s, magnetic medium is No. 2 steel wool) are the same. After magnetic separation, take the concentrate for chemical analysis, and the experimental results are as follows:

[0036] Experimental Example 2 Configure 30 kg of 80-mesh feldspar pulp with a concentration of 20%, divide it into two parts, and conduct experimental comparisons using the same equipment. All beneficiation parameters (background magnetic field 1.0 T, feeding speed 20 mm / s, magnetic medium is 4*8 and 6*12 medium nets) are the same. After magnetic separation, take the concentrate for chemical analysis, and the experimental results are as follows:

[0037] Based on the above experimental examples, the present invention can significantly improve the concentrate indexes of different materials.

[0038] Conventional cleaning means that only the clear water pumped by the pump is used to flush the magnetic medium.

[0039] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A large electromagnetic slurry magnetic separator, characterized in that: include: Rack(1); A magnetic separation assembly, the magnetic separation assembly being arranged on the frame (1); the magnetic separation assembly comprising a horizontally arranged bottom plate (2), the bottom plate (2) being provided with a plurality of vertically arranged and sequentially nested positioning cylinders (3), the gaps between adjacent positioning cylinders (3) being filled with magnetic medium; the bottom plate (2) being provided with a plurality of first through holes (21) in the area between adjacent positioning cylinders (3); and a plurality of second through holes (31) being provided on the circumferential surface of the positioning cylinder (3); A pre-magnetization cavity (4), one end of the pre-magnetization cavity (4) extends into the innermost positioning cylinder (3), and the other end of the pre-magnetization cavity (4) is connected to a feed pipe (41) and a water inlet pipe (42); a plurality of excitation rings (5) are provided in the pre-magnetization cavity (4), and the excitation rings (5) are located inside the innermost positioning cylinder (3); A driving assembly, the driving assembly being fixed on the frame (1), and the driving assembly being capable of driving the magnetic separation assembly to rotate around the axis of the positioning cylinder (3) located at the innermost layer; A material barrel (7), the material barrel (7) being arranged on the frame (1), the magnetic separation assembly being located inside the material barrel (7); and a discharge pipe (71) being provided at the bottom of the material barrel (7); An excitation coil (8), wherein the excitation coil (8) is fixed on the frame (1) and is arranged around the material barrel (7).

2. A large-scale electromagnetic slurry magnetic separator according to claim 1, characterized in that: There is a gap between the inner bottom surface of the material barrel (7) and the bottom surface of the bottom plate (2), a spoiler disk (72) is provided on the inner bottom surface of the material barrel (7), the upper surface of the spoiler disk (72) is configured as a conical surface, and corrugated strips are provided on the conical surface.

3. A large-scale electromagnetic slurry magnetic separator according to claim 2, characterized in that: The drive assembly comprises a vertically arranged transmission shaft (61), the upper end of the transmission shaft (61) passes through the material barrel (7) and the spoiler disk (72) in sequence and is fixedly connected to the bottom plate (2), and the lower end of the transmission shaft (61) is connected to a motor (62) capable of driving the transmission shaft (61) to rotate.

4. A large-scale electromagnetic slurry magnetic separator according to claim 3, characterized in that: The transmission shaft (61) is sleeved with a sleeve (73) on its exterior, the sleeve (73) and the transmission shaft (61) being in clearance fit, the upper end of the sleeve (73) being fixedly connected to the bottom surface of the spoiler (72), and the lower end of the sleeve (73) being fixedly connected to the frame (1); the upper end and the lower end of the sleeve (73) are both rotationally sealed with the transmission shaft (61); the sleeve (73) is provided with an exhaust port (731) and a refueling port (732); the refueling port (732) is located at the bottom of the sleeve (73), and the portion of the transmission shaft (61) located within the sleeve (73) has an external thread (611).

5. A large-scale electromagnetic slurry magnetic separator according to claim 2, characterized in that: A plurality of vertically arranged convex ribs (74) are provided on the inner circumferential surface of the material barrel (7).

6. A large-scale electromagnetic slurry magnetic separator according to claim 1, characterized in that: A cover plate (75) is provided at the upper end of the material barrel (7), an upper connecting tube (76) is provided on the cover plate (75), and the pre-magnetization chamber (4) passes through the upper connecting tube (76) and is gap-fitted with the upper connecting tube (76).

7. A large-scale electromagnetic slurry magnetic separator according to claim 1, characterized in that: The excitation ring (5) comprises a plurality of parallel dielectric strips (51) and a plurality of parallel connecting strips (52), wherein the connecting strips (52) are located below the dielectric strips (51), the dielectric strips (51) and the connecting strips (52) are arranged vertically and fixedly connected to each other, and both ends of the connecting strips (52) are fixedly connected to the pre-magnetization cavity (4); the dielectric strips (51) are made of magnetic conductive material, and the connecting strips (52) are made of non-magnetic conductive material; And / or, a plurality of the excitation rings (5) are distributed along the extension direction of the pre-magnetization cavity (4).

8. A large-scale electromagnetic slurry magnetic separator according to claim 1, characterized in that: The base plate (2) and the positioning cylinder (3) are both made of non-magnetic conductive materials; And / or, the bottom plate (2) is circular, and the positioning cylinder (3) located at the outermost layer is fixedly connected to the outer edge of the bottom plate (2); And / or, the axes of the plurality of positioning cylinders (3), the bottom plate (2), and the pre-magnetization cavity (4) are all collinear; And / or, the magnetic medium is configured as a steel wool medium, a diamond mesh medium or a rod-shaped medium.

9. A large-scale electromagnetic slurry magnetic separator according to claim 1, characterized in that: The pre-magnetization chamber (4) is arranged vertically, and the feed pipe (41) and the water inlet pipe (42) are both connected to the upper end of the pre-magnetization chamber (4); And / or, the discharge pipe (71) is arranged vertically, and the lower end of the discharge pipe (71) is provided with a tailings outlet (711) and a concentrate outlet (712).

10. A large-scale electromagnetic slurry magnetic separator according to claim 1, characterized in that: An upper magnetic pole (11) is provided on the frame (1) at a position corresponding to the upper portion of the material barrel (7), and the pre-magnetization chamber (4) passes through the upper magnetic pole (11); And / or, a lower magnetic pole (12) is provided on the frame (1) at a position corresponding to below the material barrel (7), and the discharge pipe (71) passes through the lower magnetic pole (12).

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