WO2020186596A1 - Low-frequency alternating-current electromagnetic elutriating machine - Google Patents

Abstract

A low-frequency alternating-current electromagnetic elutriating machine, comprising: a washing separator (1), a concentrate cone (5), an overflow device (2), an ore feeding device (3), a water supply device, and a magnetic separation device. The magnetic separation device comprises ore gathering magnetic field coils (11) sleeved on the top of the outer periphery of the washing separator (1) and a plurality of traveling-wave magnetic field coils (9) located below the ore gathering magnetic field coils (11). Single-phase low-frequency alternating-current is fed into the ore gathering magnetic field coils (11), and three-phase low-frequency alternating-current is fed into the traveling-wave magnetic field coils (9). The traveling-wave magnetic field coils (9) are connected in "Y" or "△" shape. The frequency of the low-frequency alternating-current is lower than 50 Hz. Inductive magnetic rings (4) are provided at the positions corresponding to the ore gathering magnetic field coils (11) inside the washing separator (1). An inner overflow cylinder (21) has the same diameter as the washing separator (1). The ore outlet of the ore feeding device (3) is located at the middle between first and second traveling-wave magnetic field coils (9a, 9b) and the middle of between the inner wall of the washing separator (1) and the outer wall of an ore feeding pipe (31). A water supply device is provided in the concentrate cone (5) below the washing separator (1). The low-frequency alternating-current electromagnetic elutriating machine can achieve a high concentrate grade and good sorting effect, and has a wide range of application.

Description

Low frequency AC electromagnetic washing machine

This application requires that the application number be 201910198699.X, the invention name is "low frequency AC electromagnetic elutriation machine", the application number is 201920331116.1, and the invention name is "low frequency AC electromagnetic elutriation machine" submitted to the China Patent Office on March 15, 2019 "The priority of the Chinese patent application, the entire content of which is incorporated into this application by reference.

Technical field

The invention relates to the technical field of magnetic separation equipment, in particular to a low-frequency alternating current electromagnetic elutriation machine.

Background technique

At present, domestic magnetic separation plants generally use magnetic separation equipment such as cylindrical magnetic separators and magnetic desilting tanks. The magnetic field strength of this type of equipment is relatively high, and the magnetic field force is relatively large, which has a strong magnetic agglomeration effect on the separation of magnetite. Therefore, there are inherent disadvantages such as "magnetic inclusions" and "non-magnetic inclusions", which make the concentrate contain more gangue, which seriously affects the grade of the concentrate. In addition, the process flow of this type of magnetic separation equipment is long and complicated, the medium ore circulation is too large, the water consumption is high, and the beneficiation cost remains high. It is contrary to the current green mining concept of improving quality and efficiency, saving energy and reducing consumption. In order to solve the magnetic and non-magnetic inclusions of conventional magnetic separation equipment, cost-effective beneficiation methods are used to obtain high-grade magnetite concentrate or ultra-pure magnetite concentrate. To this end, various research and development units have done a lot of work, such as increasing The number of poles of the cylindrical magnetic separator increases the number of tumbling of the concentrate powder, and appropriately reduces the magnetic field strength at the concentrate end. Add flushing water to the weak magnetic area of the unloading end, install vibration devices, pulsating magnetic field and rotating magnetic field magnetic separator, etc. However, the above-mentioned methods have little effect on improving the grade of concentrate. Therefore, the development of a magnetic separation equipment that improves quality and efficiency, energy saving and environmental protection has become the current primary task.

At present, traditional electromagnetic elutriation machines generally use overflow weirs larger than the diameter of the washing drum. An overflow weir with an enlarged diameter reduces the amount of concentrate in the tailings. At the same time, due to the larger diameter, the flow rate decreases, which is very easy to cause non-magnetic The hovering or sinking of minerals makes the discharge of non-magnetic tailings unsmooth, causing the continuous deterioration of the washing environment in the drum, which seriously affects the grade of the concentrate. Increasing the water flow can easily increase the water flow speed in the washing drum, making a considerable part The fine-grained concentrate rises with the water flow to the junction of the washing bucket and the overflow weir. The slightly larger-grained concentrate hangs here. When the ore or water supply fluctuates greatly, the concentrate in the suspension area is discharged into the tailings , The mine runs seriously, causing a waste of resources. When the fluctuation of the ore or water supply is too small, the non-magnetic tailings in the suspension area sink into the washing drum, which destroys the washing environment in the drum, resulting in unstable concentrate grade and affecting product quality; overflow weir with reduced diameter Only the position of the overflow port increases the water flow speed, resulting in a small pressure difference in the washing cylinder below the junction of the overflow port and the cylinder body, and the rising water flow rate slows down, resulting in incomplete separation of concentrate and non-magnetic ore , Unable to achieve the desired sorting effect.

In addition, traditional electromagnetic washing machines generally use too long feeding pipes, so that the outlet is located at the center of the cylinder where the third and fourth pulsating excitation coils are flat, causing the first and second coils on the upper part to fail to function. , Due to the long feed pipe, the settlement distance of the slurry is shortened, the number of tumbling is reduced, and the concentrate grade is reduced. In order to improve the grade of the concentrate, increase the water consumption, and increase the water flow speed, the grade of the concentrate has been improved while the mine runs seriously and wastes a lot of water resources. Even if a constant magnetic field coil is installed on the upper part of the first pulsating magnetic field coil, due to the limitation of the constant magnetic field characteristics of the coil, it only has an adsorption effect on the concentrate near the cylinder wall. The constant magnetic field coil, due to the nature of the DC power supply, only has an adsorption function. After the concentrate is adsorbed, it does not have the ability to roll. Therefore, the internal inclusions cannot be squeezed out. When the adsorbed mineral powder reaches a certain amount At this time, part of the mineral powder escapes the restriction of the magnetic field and falls into the washing drum. Because it does not have the functions of tumbling and scrubbing, the non-magnetic inclusions inside the iron powder also fall into the washing drum, causing damage to the stable sorting environment in the drum. The resulting concentrate grade is unstable. At the same time, the magnetic field gradually decreases along the cylinder wall to the center of the cylinder, making some areas in the cylinder become non-magnetic and weak magnetic areas. For this area, when the water flow is too large, the magnetic field cannot be used to absorb the fine-grained concentrate that rises with the water flow. Therefore, the constant magnetic field coil has little effect in a stable sorting environment. When the water flow or the amount of slurry fluctuates greatly, it cannot play a decisive role in controlling ore, resulting in ore running. The lower end of the feed pipe is evenly distributed along the circumferential direction with ore outlets. The ore distribution method is to feed the ore in a way that coincides with the axis of the washing drum. When the pulp reaches the bottom of the feed pipe, it passes through the holes in a direction perpendicular to the axis. The cloth hole flows into the rising water flow. Because the cloth hole is far away from the inner cylinder wall, the magnetic field has weak binding force on the slurry. In this area, the magnetic link is basically not formed, and the magnetic tumbling effect cannot be produced. Because the settlement distance is too long Therefore, the unreasonable location and method of ore distribution and the too short settlement distance for the ore pipe are one of the key factors affecting the quality of the concentrate.

Secondly, the water inlets of the traditional electromagnetic washing machine are evenly distributed on the horizontal circumference of the lower part of the washing drum, and holes are directly opened on the horizontal circumference, so that the water flow into the drum is in a disordered state, causing the concentrate that settles here to be disturbed again Dispersion will cause great damage to the concentrated concentrate. Even if the concentrated ore coil with a constant magnetic field is installed at the lower part of the water inlet, it is difficult to absorb the concentrate powder in the center of the washing drum, and it will not work well. Enrichment. Therefore, it is not appropriate to set the water inlet at this position and the way to set the water inlet; some manufacturers set the water inlet in the horizontal area of the fourth and fifth coils, and the water pipe is connected to the tube from the outside of the washing tube and perpendicular to the tube. At the axis of the washing drum, connect a water inlet pipe that coincides with the axis of the washing drum to the horizontal area of the fourth and fifth coils, block the top of the water inlet pipe, and evenly distribute water dividers on the upper circumference of the water inlet pipe. There are several water outlets on the same horizontal surface of each water distribution pipe, so that the water flow is in an ascending spiral state. Since the grade of the concentrate has reached the ideal state when the concentrate enters this area, it is the key stage of enriching the ore. Disturbance of the water flow will break up the initially enriched fine ore powder again, which is not conducive to ore gathering. In addition, in this area, the law of gradually improving the water quality conditions from top to bottom in the water distribution damage tube in this area shows that the water quality in the water supply area is the best, the lower area is the second, and the top area is the worst. The problem of pollution again.

In addition, the power supply of the traditional electromagnetic washing machine adopts direct current excitation, and the thyristor is alternately energized to generate alternating pulsating magnetic fields between the coils. For example, when coils 1, 3, and 5 are energized at the same time, the concentrated ore powder located here is formed Magnetic chain, the concentrate powder in a fixed magnetic field only forms a magnetic chain, and the concentrate particles are relatively immobile, unable to scrub and precipitate the internal non-magnetic inclusions. When the power is off, the magnetic chain disappears and the concentrate continues to sink. , Part of the fine-grained concentrate powder is discharged into the tailings along with the rising water flow and medium and fine-grained non-magnetic materials without magnetic adsorption. When coils 2, 4, and 6 are energized, the concentrate particles will rotate 180° from the state in the previous magnetic field cycle to form a magnetic link again. The energization interval of the two coils is different due to the different selection environments, and the approximate range is 1 Between -6 seconds, while the magnetic tumbling effect is realized over and over again, the interval of the non-magnetic empty window also causes a large amount of fine-grained concentrate powder to be thrown to the tailings, resulting in a lot of waste of resources.

In addition, due to the difference in the surface, underground, and geographic areas, the properties of the ore are different. Therefore, there is a distinction between easy beneficiation and difficult beneficiation. Regarding the difference in the nature of the ore, the focus of each concentrator is also different. Under the premise that the concentrate grade has been set, easy beneficiation tries its best to control tails and run ore. Refractory minerals are refined as much as possible. Due to the difference in the nature of the ore, the focus of the beneficiation is different, and the different focus causes the washing machine to have a large magnetic field adjustment range and matching tumbling times and scrubbing functions. However, the traditional DC electromagnetic washing machine The magnetic field has a narrow adjustment range, does not have the scrubbing function, and cannot meet the different requirements for ore separation, resulting in the beneficiation index unable to meet customer requirements.

Summary of the invention

In view of this, the technical problem to be solved by the present invention is to provide a low frequency AC electromagnetic washing machine with high concentrate grade and good sorting effect.

In order to solve the above technical problems, the technical solution of the present invention is: a low-frequency AC electromagnetic elutriation machine, including: a washing drum, the bottom of the washing drum is provided with a concentrate cone, and the top of the washing drum is provided with an overflow device , The overflow device is installed with a ore supply device extending into the inside of the washing drum, a water supply device for supplying water to the inside of the washing drum is provided outside the washing drum, and the outer periphery of the washing drum is provided The magnetic separation device includes a plurality of magnetic field coils sleeved on the outer circumference of the washing cylinder and spaced along the axial direction of the washing cylinder, and the magnetic field coils are fed with low-frequency alternating current.

The following are several further improvements of the low-frequency AC electromagnetic washing machine of the present invention:

Wherein, the magnetic field coil includes a mining magnetic field coil located at the top and a plurality of traveling wave magnetic field coils located below the mining magnetic field coil.

Wherein, the mine magnetic field coil is supplied with single-phase low-frequency alternating current, and several of the traveling wave magnetic field coils are supplied with three-phase low-frequency alternating current.

Wherein, the frequency of the three-phase low-frequency alternating current is lower than 50 Hz, and the frequency of the single-phase low-frequency alternating current is lower than 50 Hz.

Wherein, further, the frequency range of the three-phase low-frequency alternating current is 0.1-20 Hz, and the frequency range of the single-phase low-frequency alternating current is 0.1-20 Hz.

Wherein, the connection mode of the several traveling wave magnetic field coils is a "Y" connection method or a "△" connection method.

Wherein, the magnetic separation device further includes: an inductive magnetic ring, the inductive magnetic ring is arranged inside the washing barrel and corresponds to the position of the ore gathering magnetic field coil.

Wherein, the inductive magnetic ring includes: a plurality of metal rings sleeved together and arranged concentrically, with spaces between adjacent metal rings, and reinforcing ribs fixedly connecting the adjacent metal rings are arranged at the spaces, The metal ring and the reinforcing rib jointly enclose a magnetic ring channel.

Wherein, the innermost metal ring is fixed to the ore feeding device.

Wherein, the axial cross section of the induction magnetic ring is in the shape of a shuttle.

Wherein, the induction magnetic ring is made of high magnetic permeability material.

Wherein, the overflow device includes an overflow sleeve and an overflow inner cylinder arranged inside the overflow sleeve. The lower end of the overflow inner cylinder is fixedly connected to the top of the washing cylinder, and the overflow The flow inner tube is the same diameter as the washing tube.

Wherein, the ore feeding device includes: a ore feeding pipe, a support arm is fixed on the outer periphery of the upper end of the ore feeding pipe, the outer end of the support arm is fixed to the top of the overflow device, and the bottom of the ore feeding pipe Sealing, the outer periphery of the lower end of the ore feeding pipe is fixed with a plurality of ore distribution pipes communicating with the inner cavity, and the ore outlet of the ore distribution pipe is located in the axial position inside the washing drum and counted from top to bottom. The middle positions of the second and third magnetic field coils are the same.

Wherein, the radial position of the ore outlet of the ore distribution pipe inside the washing drum is at the middle of the distance between the inner wall of the washing drum and the outer wall of the ore feeding pipe.

Wherein, the ore outlets of the multiple ore distribution pipes are arranged along the tangential direction.

Wherein, the ore distribution pipe includes a radial section and a tangential section connected to the outer end of the radial section, the other end of the tangential section is the mine outlet, and the inner end of the radial section It is fixedly connected with the outer periphery of the lower end of the feeding pipe and communicates with the inner cavity.

Wherein, the radial section of the ore distribution pipe is inclined downwardly relative to the ore supply pipe.

Wherein, the outer periphery of the upper end of the feeding pipe is fixed with an inlet pipe communicating with the inner cavity.

Wherein, the top of the feeding pipe is open.

Wherein, the water supply device includes: a water jacket ring placed on the upper end of the outer wall of the concentrate cone, and the upper end of the inner wall of the concentrate cone is provided with a plurality of jet pipes communicating with the inner cavity of the water jacket.

Wherein, the water outlet direction of the jet pipe is arranged tangentially and is consistent with the mine outlet direction of the ore feeding device.

Wherein, the jet tube is provided with one layer, or two or more layers are arranged up and down, and each layer includes a plurality of the jet tubes; the positions of the jet tubes in adjacent layers are staggered.

After adopting the above technical scheme, the beneficial effects of the present invention are as follows:

Because the magnetic field coil of the low-frequency AC electromagnetic washing machine of the present invention is fed with low-frequency alternating current, when the magnetic field coil is energized, the concentrate powder in the alternating magnetic field not only forms a magnetic chain, but also the concentrate particles can move relative to each other, with flipping , Scrubbing function, so as to separate out the internal non-magnetic inclusions, improve the grade of the concentrate, and the sorting effect is good; at the same time, compared with the alternating current mode of direct current, it adopts low-frequency AC power supply for excitation, and there is no non-magnetic empty window period. A large amount of fine-grained concentrate powder is thrown into the tailings, avoiding resource waste.

Since the inside of the washing drum is equipped with an induction magnetic ring at the position corresponding to the mine magnetic field coil, after the mine magnetic field coil is energized, the magnetic field is induced on the induction magnetic ring inside the washing drum, which improves the magnetic force around the outer wall of the mine feeding device. It solves the problem of ore running along the outer wall of the mine feeding device due to large fluctuations of water flow or slurry. At the same time, a periodic low-frequency alternating current is passed into the ore magnetic field coil, so that the concentrate powder adsorbed on the induction magnetic ring is adsorbed by the induction magnetic ring, and it also has periodic magnetic tumbling. Rubbing and scrubbing with each other makes the non-magnetic ore contained in the concentrate powder continue to be squeezed out and taken out by the rising water flow. As the water supply and the ore supply become stable, the concentrate powder adsorbed on the induction magnetic ring attracts more and more When reaching a certain amount, part of the concentrate powder re-sinks into the washing drum. Due to the characteristics of the low-frequency AC excitation magnetic field, the concentrate powder adsorbed on the induction magnetic ring has the functions of magnetic tumbling, friction and scrubbing, making it fall into the washing machine. The mineral powder of the sorting drum loses the condition of non-magnetic inclusion, therefore, it will not cause damage to the stable sorting environment in the drum, making the concentrate grade more stable.

Since the axial section of the induction magnetic ring is in the shape of a shuttle, the height of the metal ring from the outer ring to the inner ring is getting higher and larger, and the area is getting larger and larger, which can make the outer ring metal ring near the wall of the washing cylinder easier to reach magnetic saturation This structure is conducive to the uniform distribution of the magnetic field, so that the magnetic field forms a magnetic screen in the area of the induction magnetic ring, which eliminates the magnetic medium and rich conjoined bodies and monomers. The concentrate escaped from the weak magnetic area to the tailings, causing runaway.

Because the frequency of low-frequency alternating current is lower than the frequency of power frequency alternating current 50Hz, during the magnetic separation process, the concentrate particles have enough time to swing to a sufficient swing in a certain flip state, creating a complete precipitation of internal non-magnetic inclusions. Advantageous conditions. For different ore properties, the frequency can be adjusted to achieve the desired number of tumbling and scrubbing, so as to more effectively and controllably increase the concentrate grade and concentrate output.

Because the wiring method of the traveling wave magnetic field coil is "Y" connection method or "△" connection method; the "Y" connection method can make the traveling wave magnetic field coil obtain high excitation current and high magnetic field strength to meet the requirements of medium and high magnetic fields. Mining requirements: The "△" type connection method can make the traveling wave magnetic field coil obtain low excitation current and low magnetic field strength to meet the requirements of weak magnetic field beneficiation; it is flexible in application and has a wide range of applications, which can meet the different requirements of ore beneficiation.

Since the overflow inner tube and the washing tube have the same diameter, the flow velocity in the washing tube and the overflow inner tube are consistent, which solves the problem of ore running or nesting.

Because the axial position of the multiple ore outlets on the outer periphery of the lower end of the ore feeding pipe in the washing cylinder is consistent with the middle position between the second and third magnetic field coils from the top to the bottom, compared with the prior art , Lengthen the settling distance and magnetic separation path of ore powder, extend the time of magnetic separation, and improve the grade of concentrate. Because the ore outlet of the ore distribution tube is located in the inner wall of the washing drum, the radial position is in the middle of the distance between the inner wall of the washing drum and the outer wall of the feeding tube, and is close to the inner wall of the washing drum, so that the traveling wave magnetic field can interfere more effectively. In beneficiation, the concentrate quickly goes against the lean, weak conjoined and monomeric non-magnetic ore, accelerating the separation and improving the grade of the concentrate. Because the outlets of the multiple ore pipes are arranged in the tangential direction, synchronized with the rising rotating water flow, the sinking concentrate powder and the rising water flow are resistance to each other, preventing the concentrate powder from sinking too fast and lengthening the magnetic separation time , Improve the grade of concentrate.

Since the upper end of the inner wall of the concentrate cone is provided with a plurality of jet pipes communicating with the water jacket cavity on the upper end of the outer wall of the concentrate cone, compared with the prior art, the water supply device is arranged in the concentrate cone below the washing tube. The position of the water supply device is lowered to avoid the disordered state of the water flow entering the washing drum, so as not to disturb the concentrate that settles down to the lower part of the washing drum, so as to avoid damaging the concentrated concentrate and ensure the smooth concentrate Concentrate to the concentrate cone. Since the water outlet direction of the jet tube is arranged in a tangential direction and is consistent with the outlet direction of the ore cloth tube,

When water is introduced, the water flow injected into the concentrate cone forms a rotating water flow in the cone. The concentrate powder tumbling with the pulse continues to enter the rotating water flow in the concentrate cone due to the difference in density between the water and the concentrate powder. , The concentrate powder is subjected to a large centrifugal force, and the concentrate powder continues to move to the inner wall of the concentrate cone with the water flow, and finally the concentrate powder slides into the concentrate valve along the inner wall of the concentrate cone at the back of the jet tube, and is discharged into the concentrate Pool.

In summary, in the low-frequency AC electromagnetic washing machine of the present invention, the multiple magnetic field coils of the magnetic separation device are fed with low-frequency alternating current, and the traveling wave magnetic field coil adopts the "Y"-shaped connection method or the "△"-shaped connection method, correspondingly The position of the mine magnetic field coil is provided with an induction magnetic ring inside the washing drum; the outer periphery of the lower end of the feeding pipe of the ore feeding device is provided with multiple ore distribution pipes. The axial positions of the ore outlet of the multiple ore distribution pipes are counted from top to bottom 2. The middle position between the third magnetic field coils is the same, and the radial position of the outlet is at the middle of the distance between the inner wall of the washing tube and the outer wall of the feeding tube; the overflow inner tube of the overflow device has the same diameter as the washing tube The water supply device is arranged under the concentrate cone under the washing drum; the low-frequency AC electromagnetic washing machine of the present invention realizes the sedimentation, chain connection, tumbling of the concentrate powder under the action of the rising water flow and the magnetic field coil passing low-frequency alternating current Friction, scrubbing and impurity removal, and finally enrichment and concentration by rotating water stream, high-grade beneficiation is realized, and the beneficiation has a wide range of applications.

Description of the drawings

In order to explain the embodiments of the present invention more clearly, the following will briefly introduce the drawings needed in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative work, other drawings can be obtained based on these drawings.

Figure 1 is a front view of the structure of a low-frequency AC electromagnetic elutriation machine according to an embodiment of the present invention;

Figure 2 is a top view of Figure 1;

Figure 3 is a top view of the induction magnetic ring in Figure 1;

Figure 4 is a sectional view of A-A in Figure 3;

Figure 5 is a front view of the ore feeding device in Figure 1;

Figure 6 is a cross-sectional view of B-B in Figure 5;

Figure 7 is a sectional front view of the concentrate cone in Figure 1;

Figure 8 is a top view of Figure 7;

Figure 9 is a "Y"-shaped wiring diagram of the traveling wave magnetic field coil in Figure 1;

Figure 10 is a schematic diagram of the circuit of Figure 9;

Figure 11 is a "△"-shaped wiring diagram of the traveling wave magnetic field coil in Figure 1;

Figure 12 is a schematic diagram of the circuit of Figure 11;

In the picture: 1-washing drum; 2-overflow device; 21-overflow inner tube; 22-overflow sleeve; 23-round bottom plate; 24-tailings mouth; 3-feeding device; 31-feeding Mine pipe; 32-support arm; 33-inlet pipe; 34-laying pipe; 341-radial section; 342-tangential section; 4-induction magnetic ring; 41-metal ring; 42-reinforcing rib; 5- Concentrate cone; 51-concentrate port; 52-valve; 6-jet tube; 7-water jacket; 71-upper round plate; 72-lower round plate; 73-rise plate; 74-inlet pipe; 8-insulation Plate; 9-traveling wave magnetic field coil; 9a-first traveling wave magnetic field coil; 9b-second traveling wave magnetic field coil; 9c-third traveling wave magnetic field coil; 9d-fourth traveling wave magnetic field coil; 9e-fifth traveling wave Magnetic field coil; 9f-sixth traveling wave magnetic field coil; 10-mica paper; 11-mine magnetic field coil; 12-non-magnetic metal plate; 13-protective cover; 14-junction box; 15-fastening bolt.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

As shown in Figures 1 and 2, the low-frequency AC electromagnetic elutriation machine of the present invention includes: a washing drum 1, a concentrate cone 5 is welded and fixed at the bottom of the washing drum 1, and a concentrate cone 5 is provided at the lower end of the concentrate cone 5. A valve 52 for adjusting the discharge of ore is installed at the mine mouth 51 and the concentrate mouth 51; an overflow device 2 is installed on the top of the washing drum 1; the overflow device 2 is installed with a ore feeding device 3 extending into the washing drum 1; A water supply device for supplying water to the inside of the washing drum 1 is arranged outside the washing drum 1; a magnetic separation device is arranged on the outer periphery of the washing drum 1, and the magnetic separation device includes sleeves on the outer circumference of the washing drum 1 and along the axial direction of the washing drum 1. A plurality of magnetic field coils are arranged at intervals by the insulating plate 8. The magnetic field coil is in the shape of an annular shape, and its inner ring is close to the outer wall area of the washing cylinder 1, and a cylindrical mica paper 10 is provided as an insulator. The magnetic field coil includes a ore on the top The magnetic field coil 11 and the traveling wave magnetic field coil 9 located below the magnetic field coil 11 are provided with an insulating plate 8 on the upper part of the magnetic field coil 11, and a non-magnetic metal plate 12 for pressing the coil is provided on the upper part of the insulating plate 8. The outer circle of the magnetic metal plate 12 is the same as the outer circle of the upper circular plate 71 of the water jacket 7 described below. The fastened traveling wave magnetic field coil 9 and the mining magnetic field coil 11 are located between the non-magnetic metal plate 12 and the upper circular plate 71 A cylindrical protective cover 13 is set in the room to prevent the ore pulp and water from damaging the traveling wave magnetic field coil 9 and the mine magnetic field coil 11. A junction box 14 is fixed outside the protective cover 13, and the magnetic field coil is connected to the junction box 14 for low frequency Alternating current.

As shown in Figures 9 to 12, the traveling wave magnetic field coil 9 includes several equally spaced and evenly distributed coils, which are sequentially identified as the first traveling wave magnetic field coil 9a, the second traveling wave magnetic field coil 9b, and the second traveling wave magnetic field coil from top to bottom. The three traveling wave magnetic field coil 9c, the fourth traveling wave magnetic field coil 9d, the fifth traveling wave magnetic field coil 9e, and the sixth traveling wave magnetic field coil 9f.

Among them, the traveling wave magnetic field coil 9 is connected to a three-phase low-frequency alternating current, and the mining magnetic field coil 11 is connected to a single-phase low-frequency alternating current. In addition, the frequency of three-phase low-frequency alternating current is lower than 50 Hz, and the frequency of single-phase low-frequency alternating current is lower than 50 Hz, that is, both are lower than the frequency of power frequency alternating current. Preferably, the frequency range of the three-phase low-frequency alternating current is 0.1-20 Hz, and the frequency range of the single-phase low-frequency alternating current is 0.1-20 Hz.

As shown in Figures 9 and 10, the wiring of several traveling wave magnetic field coils is a "Y" connection, that is: the first traveling wave magnetic field coil 9a and the fourth traveling wave magnetic field coil 9d are connected in series, and one end is connected The other end of the phase line U is connected to the common node; the second traveling wave magnetic field coil 9b is connected in series with the fifth traveling wave magnetic field coil 9e, one end is connected to the phase line V, and the other end is connected to the common node; the third traveling wave magnetic field coil 9c is connected to the first The six traveling wave magnetic field coils 9f are connected in series, one end is connected to the phase line W, and the other end is connected to the common node. Using the "Y" connection method, the traveling wave magnetic field coil can obtain high excitation current and high magnetic field strength to meet the requirements of medium and high magnetic field beneficiation.

As shown in Fig. 11 and Fig. 12, the wiring of several traveling wave magnetic field coils can also adopt the "△" connection method, namely: the first traveling wave magnetic field coil 9a, the second traveling wave magnetic field coil 9b, and the third The traveling wave magnetic field coil 9c, the fourth traveling wave magnetic field coil 9d, the fifth traveling wave magnetic field coil 9e, and the sixth traveling wave magnetic field coil 9f are first connected, and the nodes of the first traveling wave magnetic field coil 9a and the sixth traveling wave magnetic field coil 9f are connected to each other. Line W, the node of the second traveling wave magnetic field coil 9b and the third traveling wave magnetic field coil 9c is connected to the phase line U, and the node of the fourth traveling wave magnetic field coil 9d and the fifth traveling wave magnetic field coil 9e is connected to the phase line V. With the "△" connection method, the traveling wave magnetic field coil can obtain low excitation current and low magnetic field strength to meet the requirements of weak magnetic field beneficiation.

As shown in Figure 1, the magnetic separation device further includes: an induction magnetic ring 4 arranged inside the washing cylinder 1 and made of high magnetic permeability material, such as electrical pure iron or Q235A material, the induction magnetic ring 4 is set in the following The ore feeding pipe 31 of the ore feeding device 3 corresponds to the position of the ore collecting magnetic field coil 11. The best way is that the horizontal axis of the induction magnetic ring 4 coincides with the horizontal axis of the mine magnetic field coil 11.

As shown in Figures 3 and 4, the induction magnetic ring 4 includes: a plurality of metal rings 41 sleeved together and arranged concentrically, with spaces between adjacent metal rings 41, and welded connections are arranged at the spaces to connect adjacent The reinforcing ribs 42 of the metal ring 41, the adjacent metal rings 41 and the adjacent reinforcing ribs 42 jointly enclose a magnetic ring channel. Among them, the innermost metal ring 41 is fixed to the feeding pipe 31.

Among them, the axial section of the induction magnetic ring 4 is in the shape of a shuttle, and the height of the metal ring 41 is getting higher and higher from the outer ring to the inner ring, and the area is getting larger and larger, which can make the outer ring metal ring closer to the washing barrel wall easier It reaches the magnetic saturation state, and does not form a magnetic field barrier to the inner metal ring, which is conducive to the uniform distribution of the magnetic field, so that the magnetic field forms a magnetic curtain in the area of the induction magnetic ring 4, which eliminates the magnetic medium and rich conjoined bodies and single The body concentrate escaped from the weak magnetic area to the tailings, resulting in runaway.

As shown in Figure 1, the overflow device 2 includes an overflow sleeve 22 and an overflow inner cylinder 21 arranged inside the overflow sleeve 22. The lower end of the overflow inner cylinder 21 passes through the top of the washing cylinder 1. The flange and the fastening bolt 15 realize a tight and sealed connection, and the overflow inner cylinder 21 and the washing cylinder 1 have the same diameter. The overflow inner cylinder 21 is sleeved with an inclined circular bottom plate 23, the overflow sleeve 22 is vertically arranged along the outer eaves of the circular bottom plate 23, and the lower end of the circular bottom plate 23 is provided with a vertical overflow sleeve 22 For the tailings port 24, the upper plane of the overflow sleeve 22 is horizontal and 50-200 mm higher than the upper plane of the overflow inner cylinder 21, and the two planes are in a parallel relationship with each other. The overflow inner cylinder 21 and the washing drum 1 have the same diameter, so that the flow velocity in the washing drum 1 and the overflow inner drum 21 are the same, which solves the problem of ore running or nesting.

As shown in Figure 1, Figure 5 and Figure 6, wherein the ore feeding device 3 includes: a ore pipe 31, a support arm 32 is fixed on the outer periphery of the upper end of the ore pipe 31, and the outer end of the support arm 32 is connected to the overflow device 2 The top of the overflow casing 22 is welded and fixed to seal the bottom of the ore pipe 31. A plurality of ore pipes 34 connected to the inner cavity are fixed on the outer periphery of the lower end of the ore pipe 31. The outlet of the ore pipe 34 is located in the washing The axial position inside the cylinder 1 coincides with the middle position between the first traveling wave magnetic field coil 9a and the second traveling wave magnetic field coil 9b. Wherein, the ore outlet of the ore distribution pipe 34 is located at the radial position inside the washing drum 1 in the middle of the distance between the inner wall of the washing drum 1 and the outer wall of the ore feeding pipe 31.

Among them, the ore outlets of the multiple ore distribution pipes 34 are arranged along the tangential direction. Wherein, the ore distribution pipe 34 includes a radial section 341 and a tangential section 342 connected to the outer end of the radial section 341. The other end of the tangential section 342 is the outlet, and the inner end of the radial section 341 is connected to the feeding pipe. The outer periphery of the lower end of 31 is fixedly connected and communicates with its inner cavity.

Wherein, the radial section 341 of the ore distribution pipe 34 is arranged obliquely downward relative to the ore supply pipe 31. This arrangement ensures that there is a component of force in the direction of gravity and the ore is smoothly discharged.

Among them, the top opening of the ore pipe 31 is convenient for maintenance and cleaning, and the ore can also be fed through the top opening. It is also possible to fix the ore inlet pipe 33 communicating with the inner cavity on the outer periphery of the upper end of the ore feeding pipe 31, and the ore inlet pipe 33 realizes the side feeding of the ore pipe 31.

As shown in Figure 1, Figure 7 and Figure 8, the water supply device includes: a water jacket 7 ring placed on the upper end of the outer wall of the concentrate cone 5, the water jacket 7 is composed of an upper circular plate 71, a lower circular plate 72 and the middle tube The vertical plate 73 is sealed and welded together, and the water inlet pipe 74 is horizontally arranged along the tangent direction of the inner wall of the vertical plate 73; the upper circular plate 71 and the bottommost traveling wave magnetic field coil are provided with insulation whose outer circle is slightly smaller than the upper circular plate 71 Plate 8; the upper end of the inner wall of the concentrate cone 5 is provided with a plurality of uniformly distributed jet tubes 6 communicating with the inner cavity of the water jacket 7, and the jet tubes 6 are close to the bottom of the washing tube 1.

Wherein, the water outlet direction of the jet pipe 6 is arranged tangentially, which is consistent with the ore outlet direction of the ore distribution pipe 34 of the ore feeding device 3.

Among them, the jet pipe 6 can be provided with one layer or two or more layers up and down according to the water supply volume. Each layer includes a plurality of jet pipes 6; the jet pipes 6 of adjacent layers are preferably staggered to ensure The water supply is even.

In the low-frequency alternating current electromagnetic washing machine of the present invention, the multiple magnetic field coils of the magnetic separation device are fed with low-frequency alternating current, and the traveling wave magnetic field coil 9 adopts the "Y" or "△" connection method, corresponding to the mine magnetic field coil 11 An induction magnetic ring 4 is arranged inside the washing drum 1; a plurality of ore distribution pipes 34 are arranged on the outer periphery of the lower end of the ore feeding pipe 31 of the ore feeding device 3, and the axial position of the ore outlet of the ore distribution pipe 34 corresponds to the first traveling wave magnetic field The middle position between the coil 9a and the second traveling wave magnetic field coil 9b is the same, the radial position of the ore outlet is at the middle of the distance between the inner wall of the washing drum 1 and the outer wall of the feeding pipe 31, and the ore distribution position and method are reasonable; The overflow inner tube 21 of the overflow device 2 and the washing drum 1 have the same diameter, which solves the problem of ore running or nesting; its water supply device is set at the concentrate cone 5 below the washing drum 1, reducing the water supply device Position, it will not disturb the concentrate that has settled down to the lower part of the washing drum 1 to ensure that the concentrate is smoothly enriched to the concentrate cone 5; the low-frequency AC electromagnetic washing machine of the present invention is connected to the low-frequency AC in the rising water flow and the magnetic field coil Under the action, the concentrated ore powder is settled, chained, rolled, rubbed, scrubbed and removed, and finally concentrated and concentrated by rotating water flow, high-grade beneficiation is realized, and the beneficiation has a wide range of applications.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown in this document, but should conform to the widest scope consistent with the principles and novel features disclosed in this document.

Claims (10)

1. The low-frequency AC electromagnetic elutriation machine includes: a washing drum, a concentrate cone is arranged at the bottom of the washing drum, an overflow device is arranged on the top of the washing drum, and the overflow device is installed to extend into the washing The ore supply device inside the washing drum, the outside of the washing drum is provided with a water supply device for supplying water to the inside of the washing drum, the outer periphery of the washing drum is provided with a magnetic separation device, the magnetic separation device includes A plurality of magnetic field coils arranged on the outer periphery of the washing cylinder and spaced along the axial direction of the washing cylinder are characterized in that the magnetic field coils are supplied with low-frequency alternating current.
2. The low-frequency AC electromagnetic washing machine according to claim 1, wherein the magnetic field coil includes a ore ore magnetic field coil at the top and a plurality of traveling wave magnetic field coils located below the ore magnetic field coil; The mine magnetic field coil is supplied with single-phase low-frequency alternating current, and several of the traveling wave magnetic field coils are supplied with three-phase low-frequency alternating current.
3. The low-frequency alternating current electromagnetic washing machine according to claim 2, wherein the frequency of the three-phase low-frequency alternating current is lower than 50 Hz, and the frequency of the single-phase low-frequency alternating current is lower than 50 Hz.
4. The low-frequency alternating current electromagnetic washing machine according to claim 3, wherein the frequency range of the three-phase low-frequency alternating current is 0.1-20 Hz, and the frequency range of the single-phase low-frequency alternating current is 0.1-20 Hz.
5. The low-frequency alternating current electromagnetic washing machine according to claim 2, characterized in that the connection mode of the plurality of traveling wave magnetic field coils is a "Y" connection method or a "△" connection method.
6. The low-frequency AC electromagnetic washing machine according to claim 2, wherein the magnetic separation device further comprises: an induction magnetic ring, the induction magnetic ring is arranged inside the washing drum and is in contact with the ore gathering The position of the magnetic field coil corresponds;

   The induction magnetic ring includes: a plurality of metal rings sleeved together and arranged concentrically, with spaces between adjacent metal rings, and reinforcing ribs fixedly connecting the adjacent metal rings are arranged at the spaces, and the adjacent metal rings The metal ring and the reinforcing ribs jointly enclose a magnetic ring channel; the innermost metal ring is fixed to the ore feeding device;

   The axial section of the induction magnetic ring is in the shape of a shuttle;

   The induction magnetic ring is made of high magnetic permeability material.
7. The low-frequency AC electromagnetic washing machine according to claim 1, wherein the overflow device comprises an overflow sleeve and an overflow inner cylinder arranged inside the overflow sleeve, the overflow inner cylinder The lower end of is fixedly connected with the top of the washing cylinder, and the overflow inner cylinder is the same diameter as the washing cylinder.
8. The low-frequency AC electromagnetic washing machine according to claim 1, wherein the ore feeding device comprises a ore feeding pipe, a support arm is fixed on the outer periphery of the upper end of the ore feeding pipe, and the outer end of the support arm is connected to The top of the overflow device is fixed, the bottom of the ore feeding pipe is sealed, and the outer periphery of the lower end of the ore feeding pipe is fixed with a plurality of ore pipes communicating with the inner cavity, and the outlet of the ore pipe is located The axial position inside the washing cylinder is consistent with the middle position between the second and third magnetic field coils from the top to the bottom;

   The radial position of the ore outlet of the ore distribution pipe inside the washing drum is in the middle of the distance between the inner wall of the washing drum and the outer wall of the ore feeding pipe;

   The ore outlets of the multiple ore distribution pipes are arranged along the tangential direction.
9. The low-frequency AC electromagnetic washing machine according to claim 8, wherein the ore distribution pipe includes a radial section and a tangential section connected with the outer end of the radial section, and the other One end is the ore outlet, the inner end of the radial section is fixedly connected to the outer periphery of the lower end of the ore pipe and communicates with its inner cavity; the radial section of the ore distribution pipe is relative to the The ore pipe is set downwardly;

   The outer periphery of the upper end of the ore feeding pipe is fixed with an ore inlet pipe communicating with the inner cavity; the top of the ore feeding pipe is open.
10. The low-frequency AC electromagnetic washing machine according to claim 1, wherein the water supply device comprises: a water jacket ring placed on the upper end of the outer wall of the concentrate cone, and the inner wall of the concentrate cone is provided with A plurality of jet tubes communicating with the inner cavity of the water jacket;

    The water outlet direction of the jet pipe is arranged tangentially and is consistent with the mine outlet direction of the ore feeding device;

    The jet tube is provided with one layer, or two or more layers are arranged up and down, and each layer includes a plurality of the jet tubes; the positions of the jet tubes in adjacent layers are staggered.

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