Centrifugal dry magnetic separation device for micro-powder minerals

Abstract

The invention relates to a centrifugal dry magnetic separation device for micro-powder minerals, which is applied to the field of magnetic separation and is characterized in that a magnetic agglomeration inhibiting roller is arranged on the basis of existing dry magnetic separation equipment, so that materials adsorbed on the magnetic agglomeration inhibiting roller are subjected to efficient separation of magnetic particles and non-magnetic particles under a centrifugal force field and a magnetic field; the whole magnetic agglomeration suppression roller can vibrate in the axial direction, formed magnetic agglomeration particles are subjected to staggered cutting-pulling dispersion-vibration breaking, and the particles are gradually dispersed, so that continuous development and expansion of magnetic agglomeration are effectively suppressed, and the magnetic agglomeration suppression effect is improved. In addition, the magnetic agglomeration suppression roller can be driven by a pulsating magnetic field generated by the multi-gradient magnetic system to vibrate in the radial direction, and on one hand, the vibration in the radial direction can make up for the unicity of axial vibration, and on the other hand, the centrifugal force borne by magnetic agglomeration can be locally changed. And a centrifugal force field of which the size can be alternated in the radial direction is created for magnetic agglomeration in a vibration manner, so that the separation of fine particles is further effectively promoted.

Description

Technical Field

[0001] A centrifugal dry magnetic separator for fine powder minerals according to the present invention, in particular, relates to a centrifugal dry magnetic separator for fine powder minerals applied to the field of magnetic separation. Background Art

[0002] Magnetic separation is a beneficiation method based on the magnetic differences of minerals. Through the magnetic field action of magnetic separation equipment, magnetic minerals are separated from non-magnetic minerals. The current magnetic separation methods mainly include wet method and dry method, and dry magnetic separation is to efficiently separate fine particles by combining a magnetic field and a centrifugal force field.

[0003] There are many magnetic separation devices that combine a magnetic field and a centrifugal force field. For example, a centrifugal high-gradient magnetic separation method with the publication number of CN101862702B discloses a magnetic separation device that uses the centrifugal force generated by the rotation of a separation cylinder in a magnetic field to select high-quality magnetic concentrates. There is also a horizontal rotary centrifugal disc manganese ore magnetic separator with the publication number of CN118513144B, which discloses a horizontally rotating and multi-directionally adjustable magnetic separator.

[0004] However, the existing magnetic separation devices either can only be applied to wet magnetic separation, which requires a large amount of water resources, or the regulation process is too complex, increasing the structural complexity of the magnetic separation device and being inconvenient for maintenance. Even by adjusting the intensity of the magnetic field, it is difficult to avoid the occurrence of magnetic agglomeration of magnetic minerals. Magnetic agglomeration is an important factor affecting the magnetic separation effect and is a problem that the existing magnetic separation devices have to face. Although the cooperation of high-gradient and high-intensity magnetic fields can effectively solve the problem of magnetic agglomeration, the specific surface area of fine particles in fine powder minerals is large and they are more likely to agglomerate. The high-intensity magnetic field is more likely to make them tightly agglomerate, and the high-gradient magnetic field can only macroscopically avoid a large amount of magnetic agglomeration from occurring and has no good inhibitory effect on the already occurred magnetic agglomeration. Summary of the Invention

[0005] Aiming at the above-mentioned prior art, the technical problem to be solved by the present invention is how to effectively improve the effect of preventing magnetic agglomeration of fine powder minerals during centrifugation and better separate non-magnetic mineral particles and magnetic mineral particles.

[0006] To solve the above problems, the present invention provides a centrifugal dry magnetic separator for fine powder minerals, which includes a magnetic separation sound insulation box, two driving disks installed inside the magnetic separation sound insulation box, a magnetic agglomeration inhibition roller fixedly connected between the two driving disks, a driving motor installed outside the magnetic separation sound insulation box and with its output end connected to one of the driving disks, a magnetic system fixing seat fixed on the outer wall of the magnetic separation sound insulation box, and a shaft concentrically arranged with the magnetic agglomeration inhibition roller and rotatably connected to the driving disk at one end. The other end of the shaft penetrates through the other driving disk and the magnetic separation sound insulation box and is fixedly connected to the magnetic system fixing seat, and a multi-gradient magnetic system with a span of half the circumference is fixedly connected to the shaft. A feed pipe is fixedly connected to the upper end of the magnetic separation sound insulation box directly above the magnetic agglomeration inhibition roller, a dust discharge port is opened on the upper side wall of the magnetic separation sound insulation box on one side of the feed pipe, a waste discharge port is opened on the lower side wall of the magnetic separation sound insulation box below the dust discharge port, a concentrate discharge port and a magnetic agglomeration discharge port are opened on the lower side wall of the magnetic separation sound insulation box at the position opposite to the waste discharge port, and a baffle is fixedly connected to the side wall of the concentrate discharge port close to the waste discharge port. Magnetic agglomeration adhesive pads are fixedly connected to both inner walls of the magnetic separation sound insulation box; The magnetic agglomeration inhibition roller includes a magnetic cylinder and a magnetic separation unit sleeved outside the magnetic cylinder. The magnetic separation unit includes a plurality of magnetic separation belts and magnetic conduction elastic connection belts distributed around the magnetic cylinder, and the plurality of magnetic separation belts and magnetic conduction elastic connection belts are alternately connected. Key grooves are opened on the side walls of the magnetic cylinder facing each magnetic separation belt, and sliding keys fixedly connected to the bottom of the magnetic separation belt are slidably connected inside the key grooves. The magnetic separation belt includes a belt seat and an elastic belt cover fixedly connected to the upper end of the belt seat. A plurality of equally spaced opening grooves are opened on the upper side wall of the belt seat, and a magnetic medium block is movably placed inside each opening groove. A magnetostrictive member fixedly connected to the bottom of the magnetic medium block contacts the middle of the opening groove. A plurality of chutes respectively facing each magnetic separation belt are opened on the side walls of the two driving disks, and a piezoelectric vibration disk and a shock absorption and noise reduction pad fixedly connected to both ends of the magnetic separation belt are respectively installed inside the opposite two chutes.

[0007] In the above-mentioned centrifugal dry magnetic separator for fine powder minerals, the magnetic separation effect is effectively improved by combining a multi-gradient magnetic field and a centrifugal force field, and the magnetic separation equipment vibrates in the radial and axial directions to disperse and break the particles that have already undergone magnetic agglomeration, effectively inhibiting the development and expansion of magnetic agglomeration, and removing the magnetic agglomeration particles by controlling the centrifugal force to avoid reducing the magnetic separation effect.

[0008] As a further improvement of the present application, the multi-gradient magnetic system is divided into an adsorption area, a transition area, a capture area, and a discharge area from top to bottom according to the magnetic field intensity, and the magnetic systems in each area can generate pulsating magnetic fields that do not interfere with each other.

[0009] As a supplementary improvement of the present application, the magnetostrictive member includes a flexible outer wrapping layer and a plurality of magnetostrictive rods uniformly and fixedly embedded inside the flexible outer wrapping layer, and the magnetostrictive rods are driven by the pulsating magnetic field generated by the multi-gradient magnetic system.

[0010] As a further improvement of the present application, the magnetic separation belt vibrates along the radial direction of the magnetic agglomeration suppression roller, the piezoelectric vibration disks on two adjacent magnetic separation belts are respectively located in the slide grooves on the two driving disks, and multiple piezoelectric vibration disks and shock-absorbing and noise-reducing pads located on the same driving disk are alternately arranged.

[0011] As a further improvement of the present application, each piezoelectric vibration disk and shock-absorbing and noise-reducing pad is slidably connected to the slide groove, and the interior of each slide groove is fixedly connected to an electro-release member fixedly connected to the piezoelectric vibration disk and the shock-absorbing and noise-reducing pad.

[0012] As a further improvement and supplement to the present application, the electro-releasing element includes an elastic wrapping column, a plurality of equally spaced cavities opened in the inner wall of the elastic wrapping column, and an electro-rheological fluid saturated in the cavities. A controller connected to the signal of each electro-releasing element is installed on the magnetic agglomeration suppression roller, and the position at which the controller controls the on and off of the electro-releasing element is located on a horizontal straight line passing through the center point of the magnetic agglomeration suppression roller.

[0013] As another improvement of the present application, the magnetic medium block includes a hollow magnetic shell, and the interior of the magnetic shell is saturated with steel wool.

[0014] As another improvement of the present application, the magnetic medium block slides along the radial direction of the magnetic agglomeration suppression roller inside the open groove, and elastic pads are fixedly connected between the two ends of the magnetic medium block along the radial direction of the magnetic agglomeration suppression roller and the inner wall of the open groove, a gap of 2-3 mm is left between the side walls of the magnetic medium block parallel to the radial direction of the magnetic agglomeration suppression roller and the inner wall of the open groove, and the interior of the open groove is saturated with magnetic fluid.

[0015] As a further improvement and supplement to the present application, the elastic forces of the elastic pads on a plurality of magnetic medium blocks are different from each other, and the elastic forces of the elastic pads on the same magnetic medium block are also different from each other.

[0016] In summary, by setting a magnetic agglomeration suppression roller on the basis of the existing dry magnetic separation equipment, the material adsorbed on the magnetic agglomeration suppression roller can be efficiently separated from the magnetic particles and non-magnetic particles under the centrifugal force field and the magnetic field. The magnetic agglomeration suppression roller can vibrate in the axial direction as a whole, and the formed magnetic agglomerate particles can be staggered cut-pulled to disperse-vibrate and break, so that they are gradually dispersed, thereby effectively suppressing the continued development and expansion of magnetic agglomeration. The magnetic agglomeration suppression roller can also use the pulsating magnetic field generated by the multi-gradient magnetic system to drive it to vibrate in the radial direction. The radial vibration can make up for the singleness of the axial vibration on the one hand, and on the other hand, it can locally change the size of the centrifugal force on the magnetic agglomeration. Through vibration, a centrifugal force field with alternating size in the radial direction is created for the magnetic agglomeration, thereby further effectively promoting the separation of fine particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a three-dimensional sectional view of the magnetic separation device according to the first embodiment of the present application; Figure 2 This is a diagram showing the positional relationship between the multi-gradient magnetic system and the magnetic agglomeration suppression roller according to the first embodiment of the present application; Figure 3 This is a three-dimensional exploded view of the drive disk and the magnetic agglomeration suppression roller according to the third embodiment of the present application; Figure 4 This is a three-dimensional exploded view of the magnetic agglomeration suppression roller according to the first embodiment of the present application; Figure 5 This is a three-dimensional exploded view of the magnetic separation belt according to the second embodiment of the present application; Figure 6 This is a three-dimensional view of the magnetic medium block according to the third embodiment of the present application; Figure 7 This is the front view of the multi-gradient magnetic system according to the first embodiment of the present application; Figure 8 This is a diagram showing the position where the magnetic separation belt throws off magnetic agglomeration according to the third embodiment of the present application; Figure 9 This is the front sectional view of the magnetostrictive element according to the first embodiment of the present application; Figure 10 This is the front sectional view of the electro-release according to the third embodiment of the present application.

[0018] Explanation of the reference numerals in the figure: 1 Magnetic separation sound insulation box, 2 Drive disk, 201 Slide groove, 3 Magnetic agglomeration suppression roller, 4 Magnetic system fixing seat, 5 Multi-gradient magnetic system, 6 Magnetic agglomeration adhesive pad, 7 Feed pipe, 8 Dust discharge port, 9 Waste discharge port, 10 Concentrate discharge port, 11 Baffle plate, 12 Magnetic agglomeration discharge port, 13 Magnetic cylinder, 1301 Keyway, 14 Magnetic separation belt, 1401 Belt seat, 1402 Elastic belt cover, 1403 Open slot, 1404 Magnetic medium block, 1405 Magnetostrictive element, 14051 Flexible outer wrapping layer, 14052 Magnetostrictive rod, 1406 Elastic pad, 15 Magnetically conductive elastic connection belt, 16 Sliding key, 17 Piezoelectric vibration disk, 18 Shock absorption and noise reduction pad, 19 Electro-release element, 1901 Elastic wrapping column, 1902 Current-variable fluid. Specific embodiments

[0019] The following will describe in detail the three embodiments of the present application with reference to the accompanying drawings.

[0020] First embodiment: As Figure 1 , 7As shown, it includes a magnetic separation soundproof box 1, two drive disks 2 installed inside the magnetic separation soundproof box 1, a magnetic agglomeration suppression roller 3 fixedly connected between the two drive disks 2, a drive motor installed outside the magnetic separation soundproof box 1 and connected to one of the drive disks 2 at the output end (the specific model is selected according to actual needs and is not described in detail here), a magnetic system fixing seat 4 fixed on the outer wall of the magnetic separation soundproof box 1, and a shaft arranged concentrically with the magnetic agglomeration suppression roller 3 and one end of which is rotatably connected to the drive disk 2, the other end of the shaft passes through another drive disk 2 and the magnetic separation soundproof box 1 and is fixedly connected to the magnetic system fixing seat 4, and a multi-gradient magnetic system 5 with a span of half a circle is fixedly connected to the shaft. The multi-gradient magnetic system 5 occupies half a circle in order to prolong the residence time of the micro-powder minerals in the centrifugal field and the magnetic field as much as possible, thereby effectively improving the separation efficiency of magnetic particles and non-magnetic particles, as shown in FIG. Figure 7 As shown, the multi-gradient magnetic system 5 is divided into an adsorption zone, a transition zone, a capture zone and a discharge zone from top to bottom according to the magnetic field strength (the specific magnetic field strength of each zone is set according to actual needs and will not be described in detail here), and the magnetic system of each zone can generate a pulsating magnetic field that does not interfere with each other. The setting of the multi-gradient magnetic field can effectively improve the magnetic separation effect, and each area can generate a pulsating magnetic field. On the one hand, it can further effectively improve the capture effect of weak magnetic particles, and on the other hand, it can also drive the magnetostrictive element 1405 to vibrate. In addition, the method for generating the pulsating magnetic field is a prior art, and the specific operating principle is not described in detail here. like Figure 1 As shown, the magnetic separation soundproof box 1 is located at the upper end of the magnetic agglomeration suppression roller 3 and is fixedly connected to a feed pipe 7, and the upper end side wall of the magnetic separation soundproof box 1 on the side of the feed pipe 7 is provided with a dust discharge port 8, and the lower end side wall of the magnetic separation soundproof box 1 below the dust discharge port 8 is provided with a waste discharge port 9, and the lower end side wall of the magnetic separation soundproof box 1 relative to the waste discharge port 9 is provided with a fine material discharge port 10 and a magnetic agglomeration discharge port 12, and the side wall of the fine material discharge port 10 close to the waste discharge port 9 is fixedly connected with a baffle plate 11, and the inner walls on both sides of the magnetic separation soundproof box 1 are fixedly connected with magnetic The magnetic agglomeration sticky pad 6 (the magnetic field strength of the magnetic agglomeration sticky pad 6 is less than the magnetic field strength of the multi-gradient magnetic system 5), the magnetic agglomeration sticky pad 6 near the waste discharge port 9 is used to stick to the magnetic agglomeration particles that have been centrifuged but not completely broken, so as to facilitate centralized collection and treatment, so as to prevent the magnetic agglomeration particles at this stage from being mixed with non-magnetic particles, and the magnetic agglomeration sticky pad 6 near the magnetic agglomeration discharge port 12 is used to stick to magnetic particles or magnetic agglomerations with strong residual magnetism. Some non-magnetic particles will be wrapped in the magnetic agglomeration at this stage, and sticking them separately is to prevent them from being mixed into the concentrate particles obtained by magnetic separation; like Figure 2 , 3As shown in the figure, the magnetic agglomeration inhibition roller 3 includes a magnetic cylinder 13 and a magnetic separation unit sleeved outside the magnetic cylinder 13. The magnetic separation unit includes a plurality of magnetic separation belts 14 and magnetic conduction elastic connection belts 15 distributed around the magnetic cylinder 13, and the plurality of magnetic separation belts 14 and magnetic conduction elastic connection belts 15 are alternately connected. A key groove 1301 is formed in the side wall of the magnetic cylinder 13 facing each magnetic separation belt 14, and a sliding key 16 fixedly connected to the bottom of the magnetic separation belt 14 is slidably connected inside the key groove 1301; As Figure 4 , 5 , Figure 9 shows that the magnetic separation belt 14 includes a belt seat 1401 and an elastic belt cover 1402 (made of a magnetic conduction material) fixedly connected to the upper end of the belt seat 1401. A plurality of equally spaced opening grooves 1403 are formed in the upper side wall of the belt seat 1401, and a magnetic medium block 1404 is movably placed inside each opening groove 1403. A magnetostrictive member 1405 in contact with the middle of the opening groove 1403 is fixedly connected to the bottom of the magnetic medium block 1404. The magnetostrictive member 1405 includes a flexible outer wrapping layer 14051 (made of a flexible magnetic conduction material) and a plurality of magnetostrictive rods 14052 (made of a magnetostrictive material) uniformly and fixedly embedded inside the flexible outer wrapping layer 14051. The magnetostrictive rods 14052 are driven by the pulsating magnetic field generated by the multi-gradient magnetic system 5. The magnetic field generated by the multi-gradient magnetic system 5 acts on the elastic belt cover 1402 and the magnetic medium block 1404. Magnetic particles are adsorbed on the elastic belt cover 1402, and non-magnetic particles are thrown out under the centrifugal force. The pulsating magnetic field can trigger the mechanical vibration of the magnetostrictive rods 14052 through the magnetostrictive effect, and then cause the magnetic medium block 1404 to produce vibration in the radial direction. The vibration in the radial direction can, on the one hand, promote the settlement of magnetic particles in the direction of the magnetic field, thereby accelerating the separation from non-magnetic particles. On the other hand, from the perspective of the centrifugal force field, it can microscopically create an alternating centrifugal force field of different sizes for non-magnetic particles, enabling the non-magnetic particles wrapped by magnetic agglomeration to quickly escape from the magnetic agglomeration, thereby effectively improving the separation effect of magnetic particles and non-magnetic particles; As Figure 3As shown in the figure, multiple chutes 201 are provided on the side walls of the two drive disks 2, each of which is directly opposite to each magnetic separation belt 14. Piezoelectric vibrating disks 17 (which are prior art and the specific structure and working principle will not be described in detail here) and shock-absorbing and noise-reducing pads 18 fixedly connected to both ends of the magnetic separation belt 14 are respectively installed in the opposite two chutes 201. The magnetic separation belt 14 vibrates along the radial direction of the magnetic agglomeration suppression roller 3. The piezoelectric vibrating disks 17 on adjacent two magnetic separation belts 14 are respectively located in the chutes 201 on the two drive disks 2, and the multiple piezoelectric vibrating disks 17 and shock-absorbing and noise-reducing pads 18 located on the same drive disk 2 are arranged alternately. While the magnetic agglomeration suppression roller 3 rotates, the piezoelectric vibrating disks 17 generate continuous vibrations through the inverse voltage effect, thereby driving the magnetic separation belt 14 to vibrate in the axial direction. Moreover, since the adjacent two piezoelectric vibrating disks 17 are respectively arranged on the two drive disks 2, the vibration directions of the adjacent two magnetic separation belts 14 are opposite when they just start to vibrate. In this way, during the vibration process, the adjacent two magnetic separation belts 14 can perform dislocation cutting, pulling and dispersion, and vibration breaking on the formed magnetic agglomerations, effectively reducing the size of the magnetic agglomerations, suppressing the development and expansion of the magnetic agglomerations, and separating the non-magnetic particles wrapped in the magnetic agglomerations during this process. Combining with the radial vibration effect can further effectively enhance the separation effect; In this embodiment, the radial vibration is generated by the magnetostrictive effect of the pulsating magnetic field, and the axial vibration is generated by the piezoelectric effect. The multi-directional vibrations can effectively prevent the occurrence of magnetic agglomerations and the development and expansion of the existing magnetic agglomerations. In addition, the axial vibration can also create an alternating centrifugal force field for the particles, so that the magnitude of the centrifugal force received by the magnetic agglomerations changes microscopically under the vibration action, further effectively improving the magnetic separation effect. Compared with the prior art, in this embodiment, the separation effect between the magnetic particles and the non-magnetic particles is improved through multi-directional vibrations, and the axial vibration can cause the centrifugal force received by the magnetic agglomerations to change, solving the drawback that the magnetic agglomeration particles receive a constant centrifugal force in the prior art.

[0021] The second embodiment: Based on the first embodiment, this embodiment further improves the vibration of the magnetic separation belt 14 in the axial direction, while the other parts are the same as those in the first embodiment; As Figure 5 shown, the magnetic medium block 1404 includes a hollow magnetic shell, and the magnetic shell is internally filled with steel wool in a saturated manner. In this embodiment, steel wool is used as the magnetic medium. The advantage is that the fibrous structure of the steel wool can enhance the local magnetic field gradient, can significantly improve the capture efficiency of fine particles, and the steel wool can withstand high centrifugal force impacts and has a long service life; As Figure 6As shown, the magnetic medium block 1404 slides in the radial direction of the magnetic agglomeration suppression roller 3 inside the opening groove 1403, and elastic pads 1406 are fixedly connected between the two ends of the magnetic medium block 1404 along the radial direction of the magnetic agglomeration suppression roller 3 and the inner wall of the opening groove 1403, and a gap of 2-3 mm is left between the side walls of the magnetic medium block 1404 parallel to the radial direction of the magnetic agglomeration suppression roller 3 and the inner wall of the opening groove 1403 (the gap is to allow the magnetic fluid to flow inside the opening groove 1403), and the interior of the opening groove 1403 is saturated with the magnetic fluid. The filling of the magnetic fluid is to make up for the gap between the two adjacent magnetic medium blocks 1 On the other hand, in order to cooperate with the steel wool as the magnetic medium, the nano-scale magnetic particles in the magnetic fluid can accurately capture the ultra-fine weak magnetic minerals, and the liquid characteristics of the magnetic fluid can make it flow under the action of vibration, effectively improving the local magnetic separation effect, and the flowing magnetic fluid also has a certain driving effect on the magnetic medium block 1404, so that the magnetic medium block 1404 can strengthen the radial vibration effect locally under the premise of radial vibration, thereby further effectively improving the effect of breaking the magnetic agglomeration and the efficiency of capturing the magnetic particles; Compared with the prior art, this embodiment can locally enhance the efficiency of capturing magnetic particles, enhance the inhibitory effect on magnetic agglomeration under a magnetic field of equal magnetic field strength, and then effectively prevent the generation, development and expansion of magnetic agglomeration under the entire multi-gradient magnetic field.

[0022] The third implementation method: This embodiment is based on the first and second embodiments, and controls the centrifugal force on the magnetic agglomeration, while other parts are consistent with the first and second embodiments; like Figure 3 , 8 As shown, each piezoelectric vibration disk 17 and the shock-absorbing and noise-reducing pad 18 are slidably connected to the slide groove 201, and the interior of each slide groove 201 is fixedly connected to an electric release member 19 fixedly connected to the piezoelectric vibration disk 17 and the shock-absorbing and noise-reducing pad 18, as shown in FIG. Figure 10 As shown, the electrorheological release member 19 includes an elastic wrapping column 1901, a plurality of equidistantly distributed cavities opened in the inner wall of the elastic wrapping column 1901, and an electrorheological fluid 1902 saturated in the cavity. A controller connected to the signal of each electrorheological release member 19 is installed on the magnetic agglomeration suppression roller 3, and the position of the electrorheological release member 19 controlled by the controller to be turned on and off is located on a horizontal straight line passing through the center point of the magnetic agglomeration suppression roller 3. The electrorheological fluid 1902 is solid when energized, and acts as a limit on the piezoelectric vibration disk 17 and the shock-absorbing and noise-reducing pad 18 to prevent the magnetic separation belt 14 from moving radially under centrifugal force. The electrorheological fluid 1902 is liquid when the power is off. During the rotation of the magnetic agglomeration suppression roller 3, the magnetic separation belt 14 first adsorbs the micro-powder mineral particles, such asFigure 8 As shown, when it rotates to the first horizontal position, the controller cuts off the power supply to the electro-releasing member 19 on the magnetic separation belt 14 at this position. At this time, the electrorheological fluid 1902 changes from a solid state to a liquid state. The piezoelectric vibrating disk 17 and the shock-absorbing and noise-reducing pad 18 lose the limiting effect of the electro-releasing member 19. Under the centrifugal force, the magnetic separation belt 14 moves outward in the radial direction. At this time, the centrifugal forces received by the non-magnetic particles and the generated magnetic agglomerates on the magnetic separation belt 14 increase due to the outward movement of the magnetic separation belt 14, so as to separate the non-magnetic particles and magnetic agglomerates in advance. The separated magnetic agglomerates first hit the magnetic agglomerate adhesion pad 6 and are adsorbed by the magnetic agglomerate adhesion pad 6. In this way, the magnetic agglomerates are not easily dropped into the non-magnetic particles, which is convenient for centralized collection and treatment. When the magnetic separation belt 14 deviates from the horizontal position, the controller immediately resumes the power supply to the electro-releasing member 19. When the magnetic separation belt 14 rotates to the second horizontal position after completing the magnetic separation work, the controller cuts off the power supply to the electro-releasing member 19 again. At this time, only the magnetic particles and magnetic agglomerates with strong remanence are left on the magnetic separation belt 14. Since the magnetic agglomerates at this time are not eliminated during the magnetic separation work, non-magnetic particles and mineral impurities will be wrapped inside. Mixing them into the concentrated ore selected by magnetic separation will reduce its quality. Therefore, here, by increasing the centrifugal force, they are separated from the magnetic agglomerate suppression roller 3. Similarly, the magnetic agglomerate adhesion pad 6 is used to adsorb them and then conduct centralized treatment; As Figure 6 shown, the elastic forces of the elastic pads 1406 on the multiple magnetic medium blocks 1404 are different from each other, and the elastic forces of the elastic pads 1406 on the same magnetic medium block 1404 are also different from each other. Since the magnetic medium blocks 1404 vibrate in the radial direction under the vibration of the piezoelectric vibrating disk 17 and the drive of the magnetic fluid, if the vibration frequencies and amplitudes of the magnetic medium blocks 1404 on the same magnetic separation belt 14 are the same, resonance will inevitably occur, and the inhibitory effect on magnetic agglomerates is not good either. Therefore, by setting elastic pads 1406 with different elastic forces, the generation of resonance can be effectively prevented, and the asynchronous vibration between the multiple magnetic medium blocks 1404 has a better inhibitory and breaking effect on magnetic agglomerates; Compared with the prior art, this embodiment can instantaneously increase the centrifugal force by controlling the change of distance, so as to remove the magnetic agglomerates to prevent them from mixing into the tailings and concentrated ore selected by magnetic separation, which is convenient for later centralized treatment.

[0023] Combined with the current actual requirements, the above-mentioned embodiment adopted in this application, the protection scope is not limited to this. Within the scope of knowledge possessed by those skilled in the art, various changes made without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A centrifugal dry magnetic separation device for micro-powder minerals, characterized in that: The invention comprises a magnetic separation soundproof box (1), two drive disks (2) installed inside the magnetic separation soundproof box (1), a magnetic agglomeration suppression roller (3) fixedly connected between the two drive disks (2), a drive motor installed outside the magnetic separation soundproof box (1) and having an output end connected to one of the drive disks (2), a magnetic system fixing seat (4) fixed on the outer wall of the magnetic separation soundproof box (1), and a shaft arranged concentrically with the magnetic agglomeration suppression roller (3) and having one end rotatably connected to the drive disk (2), the other end of the shaft passing through the other drive disk (2) and the magnetic separation soundproof box (1) and fixedly connected to the magnetic system fixing seat (4), and a multi-gradient magnetic system (5) having a span of half a circle length is fixedly connected to the shaft, the magnetic system fixing seat (4) having a magnetic system (5 ... The sound insulation box (1) is located at the upper end of the magnetic agglomeration suppression roller (3) and is fixedly connected to a feed pipe (7), and a dust discharge port (8) is provided on the upper side wall of the magnetic separation sound insulation box (1) located on one side of the feed pipe (7), and a waste discharge port (9) is provided on the lower side wall of the magnetic separation sound insulation box (1) located below the dust discharge port (8), and a fine material discharge port (10) and a magnetic agglomeration discharge port (12) are provided on the lower side wall of the magnetic separation sound insulation box (1) at a position relative to the waste discharge port (9), and a baffle plate (11) is fixedly connected to the side wall of the fine material discharge port (10) close to the waste discharge port (9), and magnetic agglomeration adhesive pads (6) with magnetism are fixedly connected to the inner walls of both sides of the magnetic separation sound insulation box (1); The magnetic agglomeration suppression roller (3) comprises a magnetic cylinder (13) and a magnetic separation unit sleeved on the outside of the magnetic cylinder (13); the magnetic separation unit comprises a plurality of magnetic separation belts (14) and magnetic elastic connecting belts (15) distributed around the magnetic cylinder (13); the plurality of magnetic separation belts (14) and magnetic elastic connecting belts (15) are alternately connected; the magnetic cylinder (13) is provided with a key groove (1301) on the side wall facing each magnetic separation belt (14); the key groove (1301) is internally slidably connected to a sliding key (16) fixedly connected to the bottom of the magnetic separation belt (14); the magnetic separation belt (14) comprises a belt seat (1401) and an elastic connecting belt (15) fixedly connected to the upper end of the belt seat (1401); The belt seat (1401) has a plurality of equally spaced open slots (1403) on its upper side wall, and a magnetic medium block (1404) is movably placed inside each open slot (1403), and a magnetostrictive element (1405) in contact with the middle of the open slot (1403) is fixedly connected to the bottom of the magnetic medium block (1404), and the side walls of the two driving disks (2) are each provided with a plurality of slide slots (201) facing each magnetic separation belt (14), and piezoelectric vibration disks (17) and shock-absorbing and noise-reducing pads (18) fixedly connected to the two ends of the magnetic separation belt (14) are respectively installed inside the two opposing slide slots (201).

2. A centrifugal dry magnetic separation device for micro-powder minerals according to claim 1, characterized in that: The multi-gradient magnetic system (5) is divided into an adsorption zone, a transition zone, a capture zone and a discharge zone from top to bottom according to the magnetic field strength, and the magnetic system of each zone can generate a pulsating magnetic field that does not interfere with each other.

3. A centrifugal dry magnetic separation device for micro-powder minerals according to claim 2, characterized in that: The magnetostrictive element (1405) comprises a flexible outer layer (14051), and a plurality of magnetostrictive rods (14052) uniformly fixedly embedded in the flexible outer layer (14051), and the magnetostrictive rods (14052) are driven by a pulsating magnetic field generated by a multi-gradient magnetic system (5).

4. A centrifugal dry magnetic separation device for micro-powder minerals according to claim 1, characterized in that: The magnetic separation belt (14) vibrates along the radial direction of the magnetic agglomeration suppression roller (3), the piezoelectric vibration disks (17) on two adjacent magnetic separation belts (14) are respectively located in the slide grooves (201) on the two drive disks (2), and a plurality of piezoelectric vibration disks (17) and shock-absorbing and noise-reducing pads (18) located on the same drive disk (2) are alternately arranged.

5. A centrifugal dry magnetic separation device for micro-powder minerals according to claim 4, characterized in that: Each of the piezoelectric vibration disk (17) and the vibration-absorbing and noise-reducing pad (18) is slidably connected to the slide groove (201), and each slide groove (201) is fixedly connected inside with an electro-releasing member (19) that is fixedly connected to the piezoelectric vibration disk (17) and the vibration-absorbing and noise-reducing pad (18).

6. A centrifugal dry magnetic separation device for fine powder minerals according to claim 5, characterized in that: The electro-releasing element (19) comprises an elastic wrapping column (1901), a plurality of equidistantly distributed cavities opened in the inner wall of the elastic wrapping column (1901), and an electro-rheological fluid (1902) saturated in the cavities. The magnetic agglomeration suppression roller (3) is provided with a controller connected to the signal of each electro-releasing element (19) at the same time, and the position where the controller controls the on and off of the electro-releasing element (19) is located on a horizontal straight line passing through the center point of the magnetic agglomeration suppression roller (3).

7. A centrifugal dry magnetic separation device for micro-powder minerals according to claim 1, characterized in that: The magnetic medium block (1404) comprises a hollow magnetic shell, and the interior of the magnetic shell is saturated with steel wool.

8. The centrifugal dry magnetic separation device for micro-powder minerals according to claim 1, characterized in that: The magnetic medium block (1404) slides inside the open groove (1403) along the radial direction of the magnetic agglomeration suppression roller (3), and elastic pads (1406) are fixedly connected between the two ends of the magnetic medium block (1404) along the radial direction of the magnetic agglomeration suppression roller (3) and the inner wall of the open groove (1403), and a gap of 2-3 mm is left between the side walls of the magnetic medium block (1404) parallel to the radial direction of the magnetic agglomeration suppression roller (3) and the inner wall of the open groove (1403), and the interior of the open groove (1403) is saturated with magnetic fluid.

9. A centrifugal dry magnetic separation device for fine powder minerals according to claim 8, characterized in that: The elastic forces of the elastic pads (1406) on the plurality of magnetic medium blocks (1404) are different from each other, and the elastic forces of the elastic pads (1406) on the same magnetic medium block (1404) are also different from each other.

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