CN1994578A - High-gradient magnetic separator - Google Patents

Abstract

A high-gradient magnetic separator, including a sorting ring and its driving device, an ore feeding device, a concentrate unloading device and a concentrate collecting device, wherein the sorting ring includes a swivel ring, a magnetic gathering medium stack, an upper magnetic pole, and a lower magnetic pole and an excitation coil group, the concentrate unloading device includes a hydraulic unloading device and a wind unloading device arranged in parallel on the outside of the swivel, and the hydraulic unloading device and the wind unloading device are respectively connected to the concentrate inside the swivel corresponding to the collection device. The present invention adopts the organic combination of water flushing and wind flushing to form the structure of the concentrate unloading device, and makes full use of the combination of medium and high pressure wind flushing and hydraulic flushing to effectively remove the magnetic particles on each magnetic gathering medium, which not only effectively improves its ore discharge speed and unloading efficiency, thereby effectively ensuring the recycling rate of mineral products, greatly saving water resources, ensuring environmental protection, and greatly improving the pulp concentration of concentrates, simplifying the entire process of beneficiation, and achieving the purpose of the present invention.

Description

A high gradient magnetic separator

technical field

The invention relates to a magnetic separator for ore dressing, in particular to a high-gradient magnetic separator.

Background technique

The proposal of high gradient magnetic separation theory has brought a qualitative leap to the field of magnetic separation, increasing the types of minerals that can be magnetically separated, and widening the upper and lower limits of particle size. Early high-gradient magnetic separators are periodic, also known as magnetic filters, and this type of equipment is widely used in occasions with extremely low magnetic content and very fine particle size. The continuous high gradient magnetic separators that appeared immediately include electromagnetic flat ring strong magnetic high gradient magnetic separators, permanent magnet and electromagnetic double vertical ring high gradient magnetic separators. Electromagnetic flat-ring high-gradient magnetic separator is easy to cause mechanical blockage because the ore feeding and cleaning water directions are the same. Permanent magnetic vertical ring high-gradient magnetic separator is very easy to form strong magnetic minerals, especially iron filings, at the ore feeding port. Magnetic blockage occurs due to accumulation. Electromagnetic vertical ring high-gradient magnetic separation is not easy to cause mechanical blockage due to the opposite flow direction of the ore and concentrate flushing water in the medium stack, and because it is electromagnetic, when the excitation current does not exist , Strong magnetic minerals and iron filings are easy to fall off at the mine mouth, and magnetic blockage is not easy to occur. In order to reduce the inclusion of non-magnetic substances in the magnetic products, vibration and pulsating high-gradient magnetic separators have appeared, such as a pulsating high-gradient magnetic separator disclosed in Chinese patent 86106144.6, which can make the enrichment ratio of recycled materials have a certain At the same time, due to the pulsation of water, the mechanical blockage is reduced, and the concentrate unloading device is washed with separate water.

In order to effectively reduce magnetic flux leakage, improve the background magnetic field strength and prevent magnetic medium blockage, Chinese patent 97236795.0 discloses a high-field-strength electromagnetic pulsation high-gradient magnetic separator. The innovation of this patent is to increase the background field strength by adding auxiliary magnetic poles. A demagnetizer is installed on the sorting ring of the concentrate unloading area to demagnetize the strong magnetic mineral particles adsorbed on the magnetic medium, so that they are easily unloaded under the action of the concentrate flushing water. The concentrate unloading device Rinse with water.

Chinese patent 02114994.1 discloses a dual-frequency vertical ring pulse high-gradient magnetic separator, which uses a unique dual-pulse device, which can generate magnetic forces in different sections of the separation space of the magnetic separator according to the fluid dynamics generated by the pulp pulsation and the magnetic force generated by the magnetic field. The difference in the force of different mineral particle groups makes them be effectively separated. The dual-pulse device can take into account the concentrate quality and metal recovery rate. It can not only obtain high-grade concentrate, but also reduce the grade of tailings to a certain extent. At the same time, it can also produce some middle ore. This equipment is especially suitable for processing The ore is composed of various minerals, but its concentrate unloading device is also washed with separate water.

Chinese patent 02134298.9 discloses a dual-frequency pulse double vertical ring high-gradient magnetic separator, which adopts the separation space of horizontal magnetic force lines formed by the left and right magnetic poles and the outer edge of the turntable, and can make the pulp in this space produce the same The combination of the dual-frequency pulse device with the direction of the magnetic field line perpendicular to each other can make the difference in force on the mineral particle groups with different magnetic properties in different sections of the separation space of the magnetic separator according to the hydrodynamic force generated by the pulp pulse and the magnetic force generated by the magnetic field. High-efficiency separation is obtained, but its concentrate unloading device is also washed with separate water. To sum up, in all these vertical-ring high-gradient magnetic separators, concentrate unloading is carried out by washing with separate water. Since the magnetic gathering medium is composed of multi-layered relatively dense rods and nets, so When flushing, only a large amount of water can be used to improve the ore unloading effect. However, there is still a small part of the concentrate that adheres to the magnetic gathering medium and cannot be washed clean, and this part of the concentrate that has not been washed clean makes the Occupying the effective surface of the magnetic gathering medium makes the unloading effect worse; at the same time, a large amount of flushing water is used to make the slurry concentration of the unloaded concentrate very thin, which not only wastes water resources, but also brings difficulty to the next operation , when the concentration does not meet the requirements, the process of concentration must also be carried out. The most important thing is that this kind of problem becomes more prominent when the equipment is large-scale. The number of layers of magnetic gathering media used in large-scale equipment is more, and the thickness is larger. To make the concentrate flush clean, in addition to increasing the amount of flushing water In addition, the speed of the sorting ring needs to be reduced, and the reduction of the speed of the sorting ring means that the processing capacity of the equipment is also reduced.

The purpose of the present invention is exactly for the above-mentioned problem existing in the prior art, provides a kind of high-gradient magnetic separator, and it can improve the processing capacity of high-gradient magnetic separator on the original basis, effectively improves the recovery rate of useful product, saves A large amount of water resources; it can greatly increase the concentration of concentrate pulp and simplify the process flow.

Contents of the invention

The purpose of the present invention is achieved through the following technical solutions:

A high-gradient magnetic separator, including a sorting ring and its driving device, an ore feeding device, a concentrate unloading device and a concentrate collecting device, wherein the sorting ring includes a swivel ring and a stack of magnetic gathering media mounted on the swivel ring 1. The upper magnetic pole, the lower magnetic pole and the excitation coil group located inside and outside the swivel, the point is that the concentrate unloading device includes a hydraulic ore unloading device and a wind unloading device arranged in parallel on the outside of the swivel, and the hydraulic ore The ore unloading device and the wind unloading device correspond to the concentrate collecting device inside the swivel respectively.

The above-mentioned hydraulic ore unloading device includes a water inlet pipe, a flushing water filter and at least one medium-high pressure nozzle, wherein each medium-high pressure nozzle faces each magnetic accumulation medium stack. The wind unloading device includes two air inlets and at least two medium and high pressure nozzles respectively located on the front and rear sides of the hydraulic ore unloading device, and each medium and high pressure nozzle faces each magnetic accumulation medium stack.

The present invention adopts the organic combination of water flushing and wind flushing to form the structure of the concentrate unloading device, and makes full use of the combination of medium and high pressure wind flushing and hydraulic flushing to effectively remove the magnetic particles (concentrate) on each magnetic gathering medium, which is both effective Improve its unloading speed and unloading efficiency, thereby effectively ensuring the recycling rate of mineral products, greatly saving water resources, ensuring environmental protection, and can also greatly increase the pulp concentration of concentrates, simplify the entire process of beneficiation, and achieve the present invention the goal of.

Describe in detail below in conjunction with accompanying drawing basic composition and working principle of the present invention:

Description of drawings

Fig. 1 is a schematic diagram of the composition of the three-dimensional structure of the present invention;

Fig. 2 is a schematic diagram of the composition of the planar structure of the present invention;

Fig. 3 is a schematic diagram of the working principle of the present invention.

Detailed ways

As shown in Figures 1 to 3, a high gradient magnetic separator according to the present invention includes a separation ring and its driving device, an ore feeding device 7, a concentrate unloading device 6 and a concentrate collecting device 8, wherein The sorting ring includes a swivel 5 and a magnetic gathering medium stack 2 installed on the swivel 5, the upper magnetic pole 3, the lower magnetic pole 4 and the excitation coil group 1 located inside and outside the swivel 5, and the swivel 5 is a vertical double ring The rings are equipped with a turntable that connects the double rings as a whole, and a shaft sleeve with bearings is installed in the turntable. The above-mentioned ring body is divided into several spaces with the same volume by a number of partitions, and the magnetic-gathering medium stack is fixed in the corresponding space. Among them, the above-mentioned magnetic gathering medium stack 2 is a rod medium, and the rod medium is fixed on a stainless steel thin plate by thousands of magnetically conductive stainless steel round rods according to certain rules. The stick media is detachable for cleaning, and the media can be reused. The magnetic gathering medium is made of materials with good magnetic permeability. In the magnetic field, the magnetic gathering medium can gather the magnetic field lines, so a magnetic field with a high gradient can be formed on its surface. The magnetic field force is proportional to the magnetic field strength and the magnetic field gradient. . In the magnetic field, the surface of the magnetic gathering medium can form a high magnetic field force, which can recover weakly magnetic minerals. The larger the surface curvature of the magnetic gathering medium, the higher the magnetic field gradient, and the better the recovery effect of fine-grained weak magnetic minerals. The concentrate unloading device 6 includes a hydraulic unloading device 61 and a wind unloading device 62 arranged in parallel on the outside of the swivel 5, and the hydraulic unloading device 61 and the wind unloading device 62 are respectively connected to the inside of the swivel 5. Concentrate collection device 8 is corresponding. The above-mentioned hydraulic ore unloading device 61 includes a water inlet pipe, a flushing water filter and at least one medium-high pressure nozzle, wherein each medium-high pressure nozzle faces each magnetic accumulation medium stack 2 respectively. The above-mentioned wind unloading device 62 includes two air inlets and at least two medium and high pressure nozzles respectively located at the front and back of the hydraulic unloading device 61, that is, at the front and rear positions along the rotation direction of the swivel 5, and each medium and high pressure nozzles are facing respectively. Each magnetic gathering medium stack 2.

Working process and principle of the present invention are as follows:

When the excitation coil 1 is supplied with high-current direct current, a very high-intensity magnetic field is formed in the sorting space, and a very high magnetic field force can be formed on the surface of the magnetic-gathering medium stack 2 in the magnetic field. The sorting ring rotates counterclockwise, and its lower part passes through the arc-shaped sorting space formed by the upper magnetic pole 3 and the lower magnetic pole 4, and each sorting chamber on the sorting ring is filled with a stack of magnetic-gathering media.

When the ore pulp enters the sorting space evenly and slowly from the feeding hopper 7, due to the action of the magnetic field, the magnetic mineral particles are attracted to the surface of the magnetic gathering medium, and are firmly attracted to the surface of the magnetic gathering medium to continue to rotate with the sorting ring. Gradually leave the magnetic field and enter the magnetic product unloading area. Since the magnetic field is very weak in this area, the magnetic product is washed off the surface of the magnetic gathering medium with the concentrated ore flushing water filtered by the flushing water filter and compressed air and enters the concentrate hopper 8 , which is a magnetic product. Thus, the particle groups with different magnetic properties can be effectively separated.

Claims (3)

1. A high-gradient magnetic separator, comprising a separation ring and its driving device, an ore feeding device (7), a concentrate unloading device (6) and a concentrate collection device (8), wherein the separation ring includes a swivel (5) and the magnetic gathering medium stack (2) installed on the swivel (5), the upper magnetic pole (3), the lower magnetic pole (4) and the excitation coil group (1) located inside and outside the swivel (5), It is characterized in that the concentrate unloading device (6) includes a hydraulic unloading device (61) and a wind unloading device (62) arranged in parallel on the outside of the swivel (5), and the hydraulic unloading device (61) And the wind unloading device (62) corresponds to the concentrate collection device (8) on the inside of the swivel (5) respectively. 2. The high-gradient magnetic separator according to claim 1, characterized in that the above-mentioned hydraulic unloading device (61) includes a water inlet pipe, a flushing water filter and at least one medium-high pressure nozzle, wherein each medium-high pressure nozzle is respectively facing With each magnetic accumulation medium stack (2). 3. The high-gradient magnetic separator according to claim 1 or 2, characterized in that the above-mentioned wind unloading device (62) includes two air inlets and at least two There are two medium-high pressure nozzles, and each medium-high pressure nozzle is facing each magnetic accumulation medium stack (2) respectively.

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