A composite magnetic system for flat ring high gradient magnetic separator

Abstract

The present invention relates to the technical field of flat ring high gradient magnetic separation equipment, and in particular to a composite magnetic system for a flat ring high gradient magnetic separator. It comprises a plurality of permanent magnetic poles and electromagnetic magnetic poles distributed in the circumferential direction; the number of the permanent magnetic poles and the electromagnetic magnetic poles is an even number, the permanent magnetic poles and the electromagnetic magnetic poles have the same circumferential position and are opposite to each other, the one-to-one opposite permanent magnetic poles and the electromagnetic magnetic poles have the same polarity, the two adjacent permanent magnetic poles have opposite polarity, and the two adjacent electromagnetic magnetic poles have opposite polarity; a cylinder that can rotate around its own axis is arranged outside the permanent magnetic pole, and the magnetic medium is fixed in the circumferential direction of the cylinder and rotates with the cylinder. The present invention combines the permanent magnetic system and the electromagnetic magnetic system, which fully utilizes the advantages of the permanent magnetic system with low energy consumption and large unit processing capacity of the flat ring high gradient magnetic separator, and overcomes the disadvantages of the low background magnetic induction intensity and difficulty in adjustment generated by the permanent magnetic system, which can effectively reduce the problem of high energy consumption of high gradient magnetic separation technology.

Description

Technical Field

[0001] The invention relates to the technical field of flat ring high gradient magnetic separation equipment, in particular to a composite magnetic system for a flat ring high gradient magnetic separator. Background Art

[0002] High gradient magnetic separation (HGMS) technology is one of the main methods for separating fine-grained weakly magnetic materials. With the needs of production development and the advancement of science and technology, various high gradient magnetic separation equipment have been developed at home and abroad, mainly including flat ring high gradient magnetic separators and vertical ring high gradient magnetic separators.

[0003] The flat ring high gradient magnetic separator has the advantages of simple structure and large processing capacity per unit ring area. In the early stage, bristles were mostly used as magnetic media. Since the feeding direction is consistent with the discharging direction, it is easy to cause magnetic medium blockage, which limits the application of flat ring high gradient magnetic separators to a certain extent. The vertical ring high gradient magnetic separator has the advantages of vertical rotation of the swivel ring, recoil concentrate, and pulsation mechanism. It has the advantages of large enrichment ratio, high sorting efficiency, and magnetic medium is not easy to be blocked. Since only about 30% of its swivel ring structure is used for the separation of weakly magnetic minerals, there are problems such as low swivel ring utilization and small processing capacity per unit ring area. The excitation method of the above high gradient magnetic separators is electromagnetic field, which has the problems of large excitation power and high energy consumption.

[0004] With the gradual improvement of the performance of magnetic materials, CN201644210U discloses a permanent magnet high gradient magnetic separator, the background magnetic induction intensity of which can reach 0.75T, reducing the energy consumption of the high gradient magnetic separator; however, there are problems such as the background magnetic induction cannot be adjusted, the magnetic induction intensity is low, the effective depth of the magnetic field is shallow, and the processing capacity is low. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the present invention provides a composite magnetic system for a flat-ring high-gradient magnetic separator, which increases the processing capacity per unit ring area of ​​the high-gradient magnetic separator, reduces the energy consumption of the high-gradient magnetic separator, and can meet the background magnetic induction intensity requirements of the high-gradient magnetic separator for separating weakly magnetic minerals.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A composite magnetic system for a flat-ring high-gradient magnetic separator comprises a plurality of permanent magnetic poles and electromagnetic magnetic poles distributed in a circumferential direction; the number of the permanent magnetic poles and the electromagnetic magnetic poles is an even number, the permanent magnetic poles and the electromagnetic magnetic poles have the same circumferential position and are opposite to each other, the one-to-one opposite permanent magnetic poles and the electromagnetic magnetic poles have the same polarity, the two adjacent permanent magnetic poles have opposite polarity, and the two adjacent electromagnetic magnetic poles have opposite polarity; a cylinder rotatable around its own axis is arranged outside the permanent magnetic pole, and a magnetic concentrating medium is fixed in the circumferential direction of the cylinder and rotates with the cylinder.

[0008] The permanent magnet pole has a circumferential length of 340 to 680 mm, a radial width of 108 to 104 mm, and an axial height of 130 to 260 mm.

[0009] The permanent magnetic poles are made of ferrite or neodymium iron boron permanent magnetic materials.

[0010] The ferrite has a remanence Br≥380mT, a coercive force Hc≥270kA / m, and a maximum magnetic energy product (BH)max≥27kJ / m 3 ; NdFeB permanent magnet material Br≥1.25T, coercive force Hc≥925kA / m, maximum magnetic energy product (BH) max≥318.5kJ / m 3 .

[0011] The plurality of permanent magnetic poles are fixedly connected to the bottom plate along the circumferential direction, the bottom plate is fixedly connected to the shaft sleeve through the rib plate, and the shaft sleeve is fixed on the main shaft of the high gradient magnetic separator; the plurality of permanent magnetic poles, the bottom plate, the rib plate and the shaft sleeve constitute a permanent magnetic pole group.

[0012] The bottom plate is made of electrical pure iron material.

[0013] The electromagnetic pole is composed of an iron core and an energized spiral coil, the energized spiral coil is U-shaped, and the size of the iron core is the same as that of the permanent magnetic pole.

[0014] The iron core is made of electrical pure iron material; the conductor of the energized spiral coil is red copper with a rectangular hole in the inner diameter, and the number of turns of the spiral coil of a single magnetic pole is 104 to 156 turns.

[0015] The magnetic fluxes generated by the permanent magnetic poles and electromagnetic magnetic poles with the same polarity squeeze each other, generating a magnetizing magnetic field with higher magnetic induction intensity in the magnetic medium of the high gradient magnetic separator; the magnetic lines of force generated by the permanent magnetic pole group facing away from the electromagnetic magnetic pole head are gathered along the magnetic conductive bottom plate in the circular cylinder to the adjacent permanent magnetic pole group with opposite polarity, while the magnetic lines of force in the opposite direction of the electromagnetic magnetic pole head are gathered along the iron core to the other pole head of the U-shaped energized spiral coil, thus forming a closed loop of magnetic lines of force.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The magnetic fluxes generated by the permanent magnetic poles and electromagnetic magnetic poles with the same polarity of the present invention squeeze each other, generating a magnetizing magnetic field with higher magnetic induction intensity in the magnetic medium of the high gradient magnetic separator; the magnetic lines of force generated by the permanent magnetic pole group facing away from the electromagnetic magnetic pole head are gathered along the magnetic conductive bottom plate in the circular cylinder to the adjacent permanent magnetic pole group with opposite polarity, while the magnetic lines of force in the opposite direction of the electromagnetic magnetic pole head are gathered along the iron core to the other pole head of the U-shaped energized spiral coil, thereby forming a closed loop of magnetic lines of force.

[0018] The present invention combines a permanent magnetic system with an electromagnetic magnetic system. Compared with a traditional single electromagnetic magnetic system or a permanent magnetic system, it fully utilizes the advantages of the permanent magnetic system such as low energy consumption and large unit processing capacity of a flat ring high gradient magnetic separator, and overcomes the disadvantages of low background magnetic induction intensity and difficulty in adjustment generated by the permanent magnetic system, thereby effectively reducing the problem of high energy consumption of high gradient magnetic separation technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the permanent magnet system of the present invention;

[0021] Figure 3 It is a schematic diagram of the structure of the electromagnetic magnetic system of the present invention;

[0022] Figure 4 It is a schematic diagram of the present invention.

[0023] In the figure: 1-permanent magnetic pole 2-bottom plate 3-support rib plate 4-sleeve 5-cylinder 6-magnetic medium 7-spiral coil 8-iron core 9-circumferential length 10-radial width 11-axial height DETAILED DESCRIPTION

[0024] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0025] like Figure 1-3 As shown, a composite magnetic system for a flat ring high gradient magnetic separator includes 2, 4 or 6 permanent magnetic poles 1 and electromagnetic magnetic poles uniformly distributed in the circumferential direction. The permanent magnetic poles 1 and the electromagnetic magnetic poles are in the same circumferential position and are opposite to each other. The opposite permanent magnetic poles 1 and the electromagnetic magnetic poles have the same polarity, and the adjacent two permanent magnetic poles 1 have opposite polarities, and the adjacent two electromagnetic magnetic poles have opposite polarities.

[0026] like Figure 2 As shown, the circumferential length of the permanent magnetic pole 1 is 340-680 mm, the radial width is 108-104 mm, and the axial height is 130-260 mm. The permanent magnetic pole 1 is made of ferrite or NdFeB permanent magnet material. The remanence Br of ferrite is ≥380 mT, the coercive force Hc is ≥270 kA / m, and the maximum magnetic energy product (BH) max is ≥27 kJ / m 3 ; NdFeB permanent magnet material Br≥1.25T, coercive force Hc≥925kA / m, maximum magnetic energy product (BH) max≥318.5kJ / m 3 .

[0027] 2, 4 or 6 permanent magnetic poles 1 are fixedly connected to the outer wall of the bottom plate 2 along the circumferential direction. The bottom plate 2 is made of electrical pure iron material. The bottom plate 2 is fixedly connected to the shaft sleeve 4 through the rib plate 3. The shaft sleeve 4 is fixed on the main shaft of the high gradient magnetic separator; 2, 4 or 6 permanent magnetic poles 1, the bottom plate 2, the rib plate 3 and the shaft sleeve 4 constitute a permanent magnetic pole group.

[0028] like Figure 3 As shown, the electromagnetic pole is composed of an iron core 8 and an energized spiral coil 7. The energized spiral coil 7 is U-shaped, and the size of the iron core 8 is the same as that of the permanent magnetic pole 1. The iron core 8 is made of electrical pure iron material. The wire of the energized spiral coil 7 is copper with a rectangular hole in the inner diameter, and the number of turns of the spiral coil of a single magnetic pole is 104 to 156. The cooling method of the spiral coil 7 is oil cooling or air cooling.

[0029] like Figure 1 As shown,

[0030] A circular cylinder 5 rotatable around its own axis is arranged outside the permanent magnetic pole group, and the magnetic medium 6 of the high gradient magnetic separator is fixed to the circumference of the cylinder 5 by stainless steel bolts and can rotate with the cylinder 5. Two sets of permanent magnetic pole groups are arranged along the axial direction.

[0031] like Figure 4 As shown, an extrusion magnetic field is generated between the permanent magnetic pole group and the electromagnetic magnetic system pole head, and the background magnetic induction intensity can reach 1.0 to 1.5 T. Taking the extrusion magnetic pole as the N pole as an example, the magnetic lines of force generated are gathered in the magnetic medium 6 of the high gradient magnetic separator to produce a higher magnetic induction intensity, thereby achieving the effect of sorting weakly magnetic minerals. The magnetic lines of force of the S pole of the permanent magnetic pole group facing away from the electromagnetic magnetic pole head are gathered along the magnetic conductive bottom plate in the cylinder to the adjacent magnetic pole group with opposite polarity, while the magnetic lines of force in the opposite direction of the electromagnetic magnetic pole head are gathered along the iron core to the other pole head of the U-shaped energized spiral coil, thereby forming a closed loop of magnetic lines of force.

[0032] Example:

[0033] Taking the magnetic induction intensity of 0.75T generated by the permanent magnetic pole on the surface of the cylinder as an example, Y30BH ferrite and N42 NdFeB permanent magnet materials are selected, the magnetic conductive material is DT4 electrical pure iron, and the size of the magnetic block is 65mm×85mm×18mm. The radial width of the permanent magnetic pole is 90mm, and it is composed of a layer of ferrite and four layers of NdFeB; three groups of magnetic blocks are arranged axially on the permanent magnetic pole, and the axial height is 195mm; six groups of magnetic blocks are arranged circumferentially on the permanent magnetic pole, and the length in the circumferential direction is 510mm. Taking the background magnetic induction intensity of 1.0T generated by the electromagnetic magnetic system as an example, the spiral conductor uses a copper wire with a rectangular hole in the inner diameter, the cross-sectional dimensions are 26mm×22mm×5mm, and the minimum current density is 4A / mm 2The number of turns is 104, 8 turns in radial direction and 13 turns in axial direction. The composite magnetic system formed by the above scheme can generate a background magnetic induction intensity of 0.75-1.5T in the sorting area of ​​the flat ring high gradient magnetic separator, which fully meets the needs of sorting weak magnetic minerals.

[0034] The magnetic fluxes generated by the permanent magnetic poles 1 and the electromagnetic magnetic poles of the present invention with the same polarity squeeze each other, generating a magnetizing magnetic field with higher magnetic induction intensity in the magnetic medium 6 of the high gradient magnetic separator; the magnetic lines of force generated by the permanent magnetic pole group facing away from the electromagnetic magnetic pole head are gathered along the magnetic conductive bottom plate in the circular cylinder to the adjacent permanent magnetic pole group with opposite polarity, while the magnetic lines of force in the opposite direction of the electromagnetic magnetic pole head are gathered along the iron core to the other pole head of the U-shaped energized spiral coil, thereby forming a closed loop of magnetic lines of force.

[0035] The present invention combines a permanent magnetic system with an electromagnetic magnetic system. Compared with a traditional single electromagnetic magnetic system or a permanent magnetic system, it fully utilizes the advantages of the permanent magnetic system such as low energy consumption and large unit processing capacity of a flat ring high gradient magnetic separator, and overcomes the disadvantages of low background magnetic induction intensity and difficulty in adjustment generated by the permanent magnetic system, thereby effectively reducing the problem of high energy consumption of high gradient magnetic separation technology.

[0036] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A composite magnetic system for a flat ring high gradient magnetic separator, characterized in that: It includes a plurality of permanent magnetic poles and electromagnetic magnetic poles distributed in a circumferential direction; The number of permanent magnetic poles and electromagnetic magnetic poles is an even number, the permanent magnetic poles and the electromagnetic magnetic poles are in the same circumferential position and are opposite to each other, the opposite permanent magnetic poles and the electromagnetic magnetic poles have the same polarity, the two adjacent permanent magnetic poles have opposite polarities, and the two adjacent electromagnetic magnetic poles have opposite polarities; a cylinder that can rotate around its own axis is arranged outside the permanent magnetic pole, and the magnetic focusing medium is fixed in the circumferential direction of the cylinder and rotates with the cylinder; The plurality of permanent magnetic poles are fixedly connected to the bottom plate along the circumferential direction, the bottom plate is fixedly connected to the shaft sleeve through the rib plate, and the shaft sleeve is fixed to the main shaft of the high gradient magnetic separator; the plurality of permanent magnetic poles, the bottom plate, the rib plate and the shaft sleeve constitute a permanent magnetic pole group; The electromagnetic pole is composed of an iron core and an energized spiral coil, the energized spiral coil is U-shaped, and the size of the iron core is the same as that of the permanent magnetic pole; The magnetic fluxes generated by the permanent magnetic poles and electromagnetic magnetic poles with the same polarity squeeze each other, generating a magnetizing magnetic field with higher magnetic induction intensity in the magnetic medium of the high gradient magnetic separator; the magnetic lines of force generated by the permanent magnetic pole group facing away from the electromagnetic magnetic pole head are gathered along the magnetic conductive bottom plate in the circular cylinder to the adjacent permanent magnetic pole group with opposite polarity, while the magnetic lines of force in the opposite direction of the electromagnetic magnetic pole head are gathered along the iron core to the other pole head of the U-shaped energized spiral coil, thus forming a closed loop of magnetic lines of force.

2. The composite magnetic system for a flat ring high gradient magnetic separator according to claim 1, characterized in that: The permanent magnet pole has a circumferential length of 340-680 mm, a radial width of 108-104 mm, and an axial height of 130-260 mm.

3. The composite magnetic system for a flat ring high gradient magnetic separator according to claim 1, characterized in that: The permanent magnetic poles are made of ferrite or neodymium iron boron permanent magnetic materials.

4. The composite magnetic system for a flat ring high gradient magnetic separator according to claim 3, characterized in that: The ferrite has a remanence Br≥380mT, a coercive force Hc≥270kA / m, and a maximum magnetic energy product (BH)max≥27kJ / m 3 ; NdFeB permanent magnet material Br≥1.25T, coercive force Hc≥925kA / m, maximum magnetic energy product (BH) max≥318.5kJ / m 3 .

5. The composite magnetic system for a flat ring high gradient magnetic separator according to claim 1, characterized in that: The bottom plate is made of electrical pure iron material.

6. The composite magnetic system for a flat ring high gradient magnetic separator according to claim 1, characterized in that: The iron core is made of electrical pure iron material; the conductor of the energized spiral coil is red copper with a rectangular hole in the inner diameter, and the number of turns of the spiral coil of a single magnetic pole is 104-156 turns.

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