Dry magnetic separator

Abstract

The utility model relates to a dry-type magnetic separator, which comprises a frame, a belt-type magnetic separator, a feed port, a concentrate chute and a tailing chute, and is characterized by further comprising a vibration excitation device and a sealing cover, the vibration excitation device comprises a vibration excitation base, a vibrator and a driving device, the sealing cover covers the upper part of the belt-type magnetic separator, and the vibration excitation base is connected with the vibration excitation base. A sealing cover is arranged on the conveyor belt, so that a space for conveying materials is formed between the sealing cover and the conveyor belt, a single-point pulse bag-type dust collector is arranged on the upper portion of the sealing cover, the concentrate chute is a chute with an opening in the right side and is arranged below the side of the head wheel, a double-layer electric gate valve A is arranged at a discharge port of the concentrate chute, and the tailing chute is a chute with an opening in the left side and is arranged below the side of the head wheel. And the concentrate chute is arranged below the side of the tail wheel, and a double-layer electric gate valve B is arranged at a discharge port of the concentrate chute. The device has the advantages that the vibration excitation device is arranged, so that the conveying rubber belt participates in vibration, and materials are vibrated on the belt surface of the conveying rubber belt; and magnetic inclusions are effectively reduced, and the recovery rate of iron ore is increased.

Description

Technical Field

[0001] The utility model belongs to the field of metal mineral beneficiation, and more specifically relates to a dry magnetic separator. Background Art

[0002] At present, two types of equipment are mainly used for dry magnetic separators for magnetic materials, namely magnetic pulleys and powder ore dry separators. Magnetic pulleys are mainly used to process coarse-grained materials, and generally control the feed size to -12mm. If the particle size is too small, the sorting effect is poor and the magnetic impurities are serious. Powder ore dry separators can process fine-grained materials, but require uniform feed size, uniform material distribution, and a thin material layer. There are also problems of small processing capacity and serious magnetic impurities. The magnetic field distribution area of ​​the two devices is small, making it difficult to achieve the functional zoning of roughing, sweeping and fine selection, and the selection efficiency is low.

[0003] The Chinese utility model patent with the authorization announcement number CN204799411U specifically discloses a belt-combined high-intensity magnetic separator, including: a primary belt sorting device and a secondary belt sorting device are both horizontally arranged inside the housing. Although this belt-combined high-intensity magnetic separator enhances the recovery accuracy of strongly magnetic minerals and improves the recovery rate of weakly magnetic minerals, it is equivalent to two-stage separation, and the equipment occupies a large space, and cannot more effectively solve the problem of mechanical inclusions. Summary of the invention

[0004] The purpose of the utility model is to provide a dry magnetic separator. The purpose of the utility model is achieved through the following technical solutions:

[0005] The utility model discloses a dry magnetic separator, comprising a frame, a belt magnetic separator, a feed port, a concentrate chute and a tailings chute, characterized in that it also comprises a vibration device and a sealing cover, the vibration device comprises a vibration base, a vibrator and a driving device, the vibration base is tiltedly arranged on the frame, and a vibration-damping spring is also arranged on the frame 1; the vibration device is fixedly installed at the lower part of the vibration base, the belt magnetic separator comprises a conveying belt, a magnetic system, a head wheel and a tail wheel, the belt magnetic separator is installed at the upper part of the vibration base, so that the plane defined by the head wheel and the tail wheel of the belt magnetic separator forms a certain inclination angle relative to the horizontal plane The eccentric magnetic system arranged on the head wheel forms a magnetic field relay, the tail wheel is an ordinary wheel roller, the sealing cover covers the upper part of the belt magnetic separator, so that a space for conveying materials is formed between the sealing cover and the conveyor belt of the belt magnetic separator, and a feeding port and a single-point pulse bag dust collector are provided on the upper part of the sealing cover. The concentrate chute is a chute with an opening on the right side, which is arranged at the lower side of the head wheel, and a double-layer electric gate valve A is provided at the discharge port of the concentrate chute. The tailings chute is a chute with an opening on the left side, which is arranged at the lower side of the tail wheel, and a double-layer electric gate valve B is provided at the discharge port of the tailings chute.

[0006] Preferably, the magnetic system is arranged in the middle of the frame through a pallet, below the lower part of the upward conveying belt. The magnetic system is composed of three magnetic pole groups. The magnetic field intensity of the three magnetic pole groups is evenly distributed along the width direction of the conveying belt, and the magnetic field intensity increases from low to high from top to bottom along the length direction of the conveying belt, forming a magnetic field gradient of a fine separation area magnetic system, a rough separation area magnetic system and a scavenging area magnetic system on the surface of the conveying belt. The rough separation area magnetic system is located in the middle of the conveying belt, with a length ratio of 1 / 2. The scavenging area magnetic system is located at the lower part of the conveying belt, with a length ratio of 1 / 4. The fine separation area magnetic system is located at the upper part of the conveying belt, with a length ratio of 1 / 4.

[0007] Preferably, the plane defined by the head pulley and the tail pulley of the belt type magnetic separator forms a certain inclination angle of 15° to 25° with the horizontal plane.

[0008] Preferably, the magnetic system is extruded from ferrite and neodymium iron boron materials, and its magnetic field intensity is 1800 to 15000 gauss.

[0009] The advantages of the present utility model are as follows:

[0010] 1) Since the excitation device is arranged on the frame of the present utility model, the material generates a vibration and bouncing effect on the belt surface of the conveying belt of the belt type magnetic separator, effectively reducing magnetic inclusion.

[0011] 2) Due to the action of the vibration force, the material is also evenly distributed on the belt surface of the conveying belt.

[0012] 3) The separation area includes a rough separation area, a scavenging area and a fine separation area. The recovery rate of magnetic materials and the concentrate grade can both be improved. Moreover, the equipment has a large processing capacity, a wide range of separated mineral particle sizes, high separation accuracy, and does not block the equipment.

[0013] 4) The magnetic materials are adsorbed on the bottom layer of the belt, playing a role of a material cushion and reducing the wear of the belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front elevation view of a schematic diagram of a dry magnetic separator according to an exemplary embodiment of the present utility model.

[0015] Figure 2 is Figure 1 the top view of.

[0016] Figure 3 It is a structural schematic diagram of a belt type magnetic separator.

[0017] Description of the reference numerals:

[0018] Frame, 2 - Belt type magnetic separator, 21 - Conveyor belt, 22 - Head pulley, 221 - Eccentric magnetic system, 23 - Tail pulley, 241 - Fine separation area magnetic system, 242 - Coarse separation area magnetic system, 243 - Scavenging area magnetic system, 3 - Sealing cover, 4 - Vibrating base, 41 - Vibrating base, 42 - Driving device, 43 - Vibrator, 5 - Single-point pulse bag filter, 6 - Concentrate chute, 61 - Double-layer electric flap valve A, 7 - Tailings chute, 71 - Double-layer electric flap valve B, 8 - Feeding port. Detailed implementation mode

[0019] The present utility model will be described in detail below in conjunction with embodiments.

[0020] As Figures 1-2 shown, a dry magnetic separator of the present utility model includes a frame 1, a belt type magnetic separator 2, a feeding port 8, a concentrate chute 6 and a tailings chute 7. It is characterized in that it further includes a vibrating device 4 and a sealing cover 3. The vibrating device 4 includes a vibrating base 41, a vibrator 43 and a driving device 42. The vibrating base 41 is inclined and arranged on the frame 1, and a damping spring 11 is also arranged on the frame 1; the vibrating device 4 is fixedly installed at the lower part of the vibrating base 41, playing a role in shock absorption; the belt type magnetic separator 2 includes a conveyor belt 21, a magnetic system, a head pulley 22 and a tail pulley 23, and the driving device of the belt type magnetic separator 2 can be frequency-converted and speed-regulated; the conveyor belt 21 of the belt type magnetic separator 2 is installed on the upper part of the vibrating base 41, so that the plane defined by the head pulley 22 and the tail pulley 23 of the belt type magnetic separator 2 forms a certain inclination angle with respect to the horizontal plane; an eccentric magnetic system 221 arranged on the head pulley 22 forms a magnetic field relay, and the tail pulley 23 is an ordinary roller. The sealing cover 3 covers the upper part of the belt type magnetic separator 2, so that a space for conveying materials is formed between the sealing cover 3 and the conveyor belt 21 of the belt type magnetic separator 2. A feeding port 8 and a single-point pulse bag filter 5 are arranged on the upper part of the sealing cover 3. The concentrate chute 6 is a chute with a right-side opening, which is arranged below the side of the head pulley 21. A double-layer electric plug valve A61 is arranged at the discharge port of the concentrate chute 6. The tailings chute 7 is a chute with a left-side opening, which is arranged below the side of the tail pulley 23. A double-layer electric plug valve B71 is arranged at the discharge port of the tailings chute 7.

[0021] As Figure 3As shown in the figure, the magnetic system of the present utility model is arranged in the middle of the frame 1 through a support plate, below the lower part of the upward conveying belt 241. The magnetic system is composed of three magnetic pole groups. The magnetic field intensity of the three magnetic pole groups is uniformly distributed along the width direction of the conveying belt 21, and the magnetic field intensity increases from low to high from top to bottom along the length direction of the conveying belt, forming a magnetic field gradient of the fine selection area magnetic system 243, the rough selection area magnetic system 242, and the scavenging area magnetic system 241 on the surface of the conveying belt. The rough selection area magnetic system 242 is located in the middle of the conveying belt, accounting for 1 / 2 of the length. The scavenging area magnetic system 241 is located at the lower part of the conveying belt, accounting for 1 / 4 of the length. The fine selection area magnetic system 243 is located at the upper part of the conveying belt, accounting for 1 / 4 of the length.

[0022] The plane defined by the head pulley 22 and the tail pulley 23 of the belt type magnetic separator 2 of the present utility model forms an angle of 15° - 25° with the horizontal plane.

[0023] The magnetic system of the present utility model is extruded from ferrite and neodymium iron boron materials, and its magnetic field intensity is 1800 - 15000 gauss.

[0024] The working principle of the present utility model is as follows:

[0025] Feeding is carried out from the feeding port, and at the same time, the vibration excitation device is started, and the conveying belt participates in vibration to realize the vibration and bouncing of materials on the surface of the conveying belt. Non-magnetic materials are discharged into the tailing chute along the inclination of the conveying belt due to the vibration force and gravity. Magnetic materials are roughly selected by the rough selection area magnetic system along the surface of the conveying belt due to the magnetic adsorption force. After further impurity removal by the fine selection area magnetic system, they are transported to the head pulley of the belt, and then discharged to the concentrate chute along with the operation of the conveying belt through the eccentric magnetic system. The scavenging area magnetic system recovers magnetic minerals to ensure the effective recovery and separation of magnetic minerals. Due to the sealing cover and the single-point pulse bag filter 5 on the belt type magnetic separator, double-layer electric plug valves are arranged in the concentrate chute and the tailing chute to ensure the overall sealing of the device. Through the suction of the single-point pulse dust collector, a slightly negative pressure is ensured inside the sealing cover to prevent dust from overflowing. The magnetic materials adsorb on the bottom layer of the belt, playing a role of a material cushion and reducing the wear of the belt. The overall device has a simple structure and is easy to implement industrially.

[0026] First of all, it should be noted that the directional terms such as "up", "down", "left", "right", "top", and "bottom" described in this application document are only the states when the dry magnetic separator of the present utility model is placed as shown in the figure. This is only to more clearly show the relative position relationship between components. When the placement method of the dry magnetic separator changes, the directions of "up", "down", "left", "right", "top", and "bottom" will also change accordingly, but this still belongs to the protection scope of this application. The following will describe in detail the embodiments of the dry magnetic separator provided by the present utility model. Embodiment

[0027] A certain magnetite, with a particle size of -12 mm, a total iron grade of 32%, and a specific magnetization coefficient of 82000×l0 -6 cm / g, a processing capacity of 350 t / h. In the comparative case, a permanent magnetic pulley of type ¢1400mm×1600mm is used for separation, with a magnetic field intensity of 3000 Gauss and a belt speed of 1.6 m / s. In this embodiment, a model of 1200mm×3000mm (belt surface: length×width) is adopted. The magnetic field intensity in the rough selection area is 3000 Gauss, the magnetic field intensity in the scavenging area is 3500 Gauss, the magnetic field intensity in the cleaning area is 2500 Gauss, the magnetic field intensity of the eccentric magnetic system is 3000 Gauss, the conveyor belt speed is 1.2 m / s, the vibrator frequency is 900 r / min, and the inclination angle of the belt magnetic separator 2 is 25°. The comparison of the implementation results is shown in Table 1.

[0028] Embodiment

[0029] A certain hematite, with a particle size of -3 mm, a total iron grade of 39%, and a specific magnetization coefficient of 280×l0 -6 cm / g, a processing capacity of 100 t / h. In the comparative case, a powder ore dry separator of type ¢750mm×2000mm is used for separation, with a magnetic field intensity of 13000 Gauss and a roller speed of 50 r / min. In this embodiment, a model of 800mm×2400mm (belt surface: length×width) is adopted. The magnetic field intensity in the rough selection area is 14000 Gauss, the magnetic field intensity in the scavenging area is 15000 Gauss, the magnetic field intensity in the cleaning area is 13000 Gauss, the magnetic field intensity of the eccentric magnetic system is 14000 Gauss, the conveyor belt speed is 1.2 m / s, the vibrator frequency is 900 r / min, and the inclination angle of the belt magnetic separator 2 is 15°. The comparison of the implementation results is shown in Table 2.

[0030]

[0031] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can still be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A dry magnetic separator, comprising a frame, a belt magnetic separator, a feed port, a concentrate chute and a tailings chute, characterized in that: It also includes a vibration device and a sealing cover. The vibration device includes a vibration base, a vibrator and a driving device. The vibration base is tilted on the frame, and a vibration-damping spring is also provided on the frame. The vibration device is fixedly installed at the lower part of the vibration base. The belt magnetic separator includes a conveyor belt, a magnetic system, a head wheel and a tail wheel. The belt magnetic separator is installed at the upper part of the vibration base so that the plane defined by the head wheel and the tail wheel of the belt magnetic separator has a certain inclination angle relative to the horizontal plane. The eccentric magnetic system arranged on the head wheel forms a magnetic field relay, and the tail wheel is Ordinary wheel roller, the sealing cover covers the upper part of the belt magnetic separator, so that a space for conveying materials is formed between the sealing cover and the conveying belt of the belt magnetic separator, a feeding port and a single-point pulse bag dust collector are provided on the upper part of the sealing cover, the concentrate chute is a chute with an opening on the right side, arranged at the lower side of the head wheel, and a double-layer electric gate valve A is provided at the discharge port of the concentrate chute, the tailings chute is a chute with an opening on the left side, arranged at the lower side of the tail wheel, and a double-layer electric gate valve B is provided at the discharge port of the tailings chute.

2. The dry magnetic separator according to claim 1, characterized in that: The magnetic system is arranged in the middle of the frame and the lower part of the upward belt through a supporting plate. The magnetic system consists of three magnetic pole groups. The magnetic field strength of the three magnetic pole groups is evenly distributed along the width direction of the conveyor belt, and the magnetic field strength is distributed from low to high from top to bottom along the length direction of the conveyor belt. The magnetic field gradients of the selected area magnetic system, the rough selection area magnetic system and the scanning area magnetic system are formed on the surface of the conveyor belt. The rough selection area magnetic system is located in the middle of the conveyor belt, accounting for 1 / 2 of the length, the scanning area magnetic system is located at the lower part of the conveyor belt, accounting for 1 / 4 of the length, and the selected area magnetic system is located at the upper part of the conveyor belt, accounting for 1 / 4 of the length.

3. The dry magnetic separator according to claim 1, characterized in that: The plane defined by the head wheel and the tail wheel of the belt magnetic separator has a certain inclination angle of 15° to 25° relative to the horizontal plane.

4. The dry magnetic separator according to claim 2, characterized in that: The magnetic system is formed by extruding ferrite and NdFeB materials, and its magnetic field strength is 1800-15000 Gauss.

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