Oblique coil electromagnetic classificator for separating weak magnetic impurities from strong magnetic concentrate

Abstract

The invention provides an oblique coil electromagnetic classificator for separating weak magnetic impurities from strong magnetic concentrate, which comprises a separation cylinder, an ore feeding device and a flushing device, an ore feeding pipe of the ore feeding device extends into the separation cylinder from the top end of the separation cylinder, the flushing device is arranged below the ore feeding pipe, and an oblique coil is arranged on the outer side of the separation cylinder, so that the weak magnetic impurities can be separated from the strong magnetic concentrate. Magnetic lines of force are obliquely distributed, magnetic linkages formed by magnetic particles are oblique, the whole magnetic linkages can be efficiently impacted in cooperation with vertical component force Fz of water flow of the flushing device, and scattering of magnetic aggregates is facilitated; the tail control flat coil and the concentrate gathering flat coil at the upper end and the lower end effectively control tailings and concentrates respectively, so that the separation efficiency of strong magnetic concentrates and weak magnetic impurities is improved, for example, in the iron-titanium separation operation of vanadium titano-magnetite ore dressing, ilmenite mixed into iron ore concentrates can be reduced, the grade of the iron ore concentrates can be improved, and titanium metal resources can be fully recycled.

Description

Technical Field

[0001] This invention relates to the field of mineral processing equipment technology, and in particular to an inclined coil electromagnetic separator for separating weak magnetic impurities from strong magnetic concentrate. Background Technology

[0002] Impurities in iron ore concentrate mainly include harmful elements and gangue components. If these impurities are not removed, they will affect smelting efficiency and product quality. Most impurities in iron ore concentrate are non-magnetic or very weakly magnetic, and can be removed by traditional drum magnetic separators or ordinary electromagnetic washing magnetic separators. However, some iron ores contain weakly magnetic impurities. These weakly magnetic impurities are very easy to mix into strong magnetic concentrate during magnetic field separation and are extremely difficult to remove by ordinary magnetic separation equipment. A typical example of strong magnetite mixed with weakly magnetic impurities is vanadium-titanium magnetite.

[0003] Vanadium-titanium magnetite is a complex mineral containing multiple valuable elements such as iron, titanium, and vanadium. Titanium magnetite and ilmenite are two key metallic minerals in vanadium-titanium magnetite resources. Currently, the beneficiation process of vanadium-titanium magnetite generally adopts the principle of "iron first, then titanium". Compared with other iron ore resources, vanadium-titanium magnetite has a higher comprehensive utilization value. Therefore, the efficient separation of the two is of great significance to the development of the iron and steel industry and the comprehensive and efficient recovery and utilization of multiple metal resources in vanadium-titanium magnetite.

[0004] With the in-depth development of vanadium-titanium magnetite resources, the "poor, fine, and complex" characteristics of the ore are becoming increasingly prominent—the ore grade is decreasing, the intercalated particle size is becoming finer, and the mineral composition is becoming more complex. Traditional beneficiation technologies are no longer sufficient to meet the needs of efficient resource recovery. Against this backdrop, achieving full mineral liberation through fine grinding technology, combined with magnetic separation technology to separate titanomagnetite and ilmenite, has become an inevitable choice for titanomagnetite beneficiation. However, magnetic separation technology is constrained by multiple factors in the iron-titanium separation process, mainly manifested in the problem of incomplete separation. The core reasons are reflected in the following four aspects: First, inherent defects in mineralogical characteristics. Titanomagnetite and ilmenite often coexist in a tightly intercalated manner as fine particles, even forming an ilmenite-iron crystal transition phase, with blurred mineral boundaries. During magnetic separation, they are prone to "entrainment effects" with intergrowths. Simultaneously, the substitution effect of other atoms on ilmenite and titanomagnetite causes compositional fluctuations that result in continuous overlap of the magnetic distributions of the two minerals, making precise separation by a fixed magnetic field strength impossible. Second, insufficient magnetic differences. Theoretically, the magnetic susceptibility of titanomagnetite (strongly magnetic) differs significantly from that of ilmenite (weakly magnetic). However, in actual ores, the magnetism of titanomagnetite weakens considerably due to increased titanium content, and some minerals exhibit magnetic properties closer to those of ilmenite. Thirdly, it readily forms high-strength magnetic agglomerates. After fine grinding, titanomagnetite is magnetized in a magnetic field, creating a "high gradient attraction" effect. This significantly increases its magnetic attraction to the weakly magnetic ilmenite, forming high-strength magnetic agglomerates that are difficult to disperse using conventional magnetic separation equipment. Fourthly, it exhibits high coercivity. Vanadium-titanium magnetite has high coercivity, making it difficult to remove magnetism after magnetization, and mechanical inclusions remain even after removal from the magnetic field.

[0005] Currently, the equipment used for refining vanadium-titanium magnetite includes ordinary permanent magnet drum separators, permanent magnet rotary separators, and electromagnetic washing and refining machines. Among these, electromagnetic washing and refining machines offer superior refining effects compared to permanent magnet equipment. However, current electromagnetic washing and refining machines are designed for removing Si (non-magnetic) from iron ore, resulting in low efficiency in removing weakly magnetic ilmenite from strongly magnetic ilmenite. This is mainly manifested in the fact that a large portion of fine ilmenite particles remain after electromagnetic washing and enters the ilmenite concentrate, leading to the loss of titanium resources and affecting the grade of the iron concentrate. From an industrial application perspective, the current vanadium-titanium iron concentrate suffers from incomplete separation, resulting in excessively high Ti content. This necessitates the use of low-grade sintered ore in industrial smelting, causing a decrease in blast furnace utilization, an increase in coke ratio, and an increase in slag volume, severely restricting production efficiency. Therefore, achieving efficient separation of titanomagnetite and ilmenite can not only improve the quality of iron concentrate, but also optimize blast furnace smelting indicators, reduce energy consumption and slag emissions, and prevent the loss of titanium resources. It is the key to the efficient utilization of vanadium-titanium magnetite resources and the reduction of costs and increase of efficiency in the industry. Summary of the Invention

[0006] The purpose of this invention is to provide a slanted coil electromagnetic separator for separating weak magnetic impurities from strong magnetic concentrate, aiming to solve the problem of efficient separation of titanomagnetite (strong magnetic) and ilmenite (weak magnetic) in the beneficiation process of vanadium-titanium magnetite.

[0007] In accordance with the above objectives, the present invention provides an inclined coil electromagnetic separator for separating weakly magnetic impurities from strongly magnetic concentrate, comprising a separator, a feeding device, and a washing device. The feeding pipe of the feeding device extends from the top of the separator into the interior of the separator, and the bottom end of the separator is a concentrate cone. The washing device is disposed between the concentrate cone and the feeding pipe. The outer side of the separator is provided with a concentrate-gathering flat coil, multiple sets of inclined coils, and a tail-control flat coil in sequence from bottom to top. The concentrate-gathering flat coil and the tail-control flat coil are horizontally arranged, and each set of inclined coils is inclined. Furthermore, the angle β between the inclined coil and the horizontal plane is 10°~30°.

[0008] Furthermore, the multiple rows of oblique coils are arranged in a zigzag pattern along the vertical direction.

[0009] Furthermore, the multiple rows of the inclined coils are parallel to each other, and the spacing between any two adjacent rows of the inclined coils is equal.

[0010] Furthermore, the fine-tuning coil and the tail-controlling coil are energized with constant DC current, while the multiple sets of inclined coils are energized with asynchronous low-frequency pulsed DC current. The pulse duty cycle k of the low-frequency pulsed DC current energized by the multiple sets of inclined coils from top to bottom decreases in stages from 80% to 20%, where: k = T on / T, T on T is the pulse conduction time, representing the time during which the slant coil is energized, has current, and generates a magnetic field within one cycle; T is the pulse period, representing the total working cycle time of a set of slant coils.

[0011] Furthermore, the number of turns of the control tail flat coil is 2 to 2.5 times the number of turns of the slant coil, and the number of turns of the fine-tuning flat coil is 1.2 to 1.5 times the number of turns of the slant coil.

[0012] Furthermore, the bottom end of the feed pipe is provided with ore outlet slots arranged in a circumferential array along its side, and each ore outlet slot is provided with an arc-shaped flow guide structure; the flushing device includes a water collection cylinder connected to an external water source, and multiple lower water distribution pipes are arranged in a circumferential array along the bottom end of the side of the water collection cylinder, and each lower water distribution pipe has an inclined outlet pipe at its top end near the wall of the sorting cylinder, which is inclined upward and points into the cylinder, and the angle θ between the inclined outlet pipe and the horizontal plane is 40°~80°; multiple upper water distribution pipes are arranged in a circumferential array along the top end of the side of the water collection cylinder, and the water outlet direction of the upper water distribution pipes corresponds to the water outlet direction of the arc-shaped flow guide structure.

[0013] Furthermore, the arc-shaped flow guiding structure includes arc-shaped plates and baffles respectively arranged on both sides of the ore outlet, and a flow guiding port is formed between the outer end of the arc-shaped plate and the baffle.

[0014] Furthermore, the end of the upper water distribution pipe away from the water collection cylinder is a bend, and the outlet end of the bend has a flat structure.

[0015] Furthermore, the water collection cylinder is connected to an external water source through a middle water inlet pipe and a lower water inlet pipe. The middle water inlet pipe is connected to the bottom end of the water collection cylinder, and the lower water inlet pipe extends to the top of the inside of the water collection cylinder.

[0016] The technical solution of this invention uses inclined coils on the outside of the sorting cylinder to distribute magnetic lines of force obliquely, making the magnetic chains formed by magnetic particles oblique. Combined with the vertical component force Fz of the water flow from the rinsing device, the entire magnetic chain can be efficiently impacted, which is beneficial for breaking up magnetic agglomerates. The tailing flat coil and the concentrate flat coil effectively control the tailings and concentrate respectively, thereby improving the separation efficiency of strong magnetic concentrate and weak magnetic impurities. For example, in the iron-titanium separation operation of vanadium-titanium magnetite beneficiation, it can reduce the mixing of ilmenite into iron concentrate, which can both improve the grade of iron concentrate and fully recover titanium metal resources. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structural layout of the selection machine of the present invention.

[0019] Figure 2 This is a schematic diagram of two combined structures of the inclined coil in this invention.

[0020] Figure 3 This is a schematic diagram of the single-slant coil structure in this invention.

[0021] Figure 4 This is a schematic diagram of the coil interface layout of the cross-section of the single-slant coil in this invention.

[0022] Figure 5 This is a cross-sectional view of the rinsing device in this invention.

[0023] Figure 6 This is a schematic diagram showing the location of the water outlet of the lower water distribution pipe in this invention.

[0024] Figure 7This is a schematic diagram showing the location of the water outlet of the upper water distribution pipe in this invention.

[0025] Figure 8 This is a schematic diagram of the upper water outlet structure in this invention.

[0026] Figure 9 for Figure 8 Sectional view along the middle AA.

[0027] Figure 10 This is a cross-sectional view of the ore outlet at the bottom of the ore pipe in this invention.

[0028] Figure 11 This is a schematic diagram of the magnetic flux direction of the inclined coil in this invention.

[0029] Figure 12 This is a schematic diagram of the magnetic flux movement within the zigzag inclined coil in Embodiment 1 of the present invention.

[0030] Figure 13 This is a schematic diagram of the parallel oblique coil flux distribution in Embodiment 2 of the present invention.

[0031] Figure 14 This is a schematic diagram of the pulsed DC current flowing through the inclined coil in this invention.

[0032] Explanation of reference numerals in the attached drawings: 1-Feeding device, 1-1-Arc plate, 1-2-Baffle, 1-3-Feeding pipe, 2-Tail control coil, 3-Separation cylinder, 4-Inclined coil, 4-1-Double glass wire metal flat wire, 5-Flushing device, 5-1-Upper water distribution pipe, 5-2-Inclined outlet pipe, 5-3-Lower water distribution pipe, 5-4-Lower inlet pipe, 5-5-Middle inlet pipe, 5-6-Water collection cylinder, 6-Fine collection coil, 7-Overflow trough, 8-Concentrate cone, 9-Valve. Detailed Implementation

[0033] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] Example 1 like Figures 1-12 As shown, the present invention provides an inclined coil electromagnetic separator for separating weak magnetic impurities from strong magnetic concentrate, including a separation cylinder 3, a feeding device 1, and a flushing device 5. The feeding pipe 1-3 of the feeding device 1 extends from the top of the separation cylinder 3 into the interior of the separation cylinder 3. The flushing device 5 is located below the feeding pipe 1-3. The bottom end of the separation cylinder 3 is a concentrate cone 8. The flushing device 5 is located between the concentrate cone 8 and the feeding pipe 1-3. A valve 9 is installed at the bottom end of the concentrate cone 8 for discharging the concentrate after separation. An overflow trough 7 is provided at the top of the side of the separation cylinder 3. During the separation process, the gangue and poor intergrowth are separated by the scouring action of the water flow from bottom to top. They are flushed to the top and discharged by the overflow trough 7 as tailings.

[0037] The outer side of the sorting cylinder 3 is provided with, from bottom to top, a fine-grinding coil 6, multiple sets of inclined coils 4, and a tail-control coil 2. The fine-grinding coil 6 and the tail-control coil 2 are horizontally arranged, while each set of inclined coils 4 is inclined, with the angle between the inclined coil 4 and the horizontal plane being β, preferably β = 10°~30°. Figure 2As shown in Figure (a): In this embodiment, the multiple sets of oblique coils 4 adopt a zigzag arrangement structure with the ends connected. The downward movement path of the magnetic particles is longer, and the magnetic chains are all oblique. Furthermore, the oblique direction changes, increasing the probability of gangue and weakly magnetic impurities being flushed out, which is beneficial for purification. The oblique coils 4 are made by winding multiple turns of double glass fiber metal flat wire 4-1 in a stepped staggered manner. Double glass fiber aluminum flat wire and double glass fiber copper flat wire are preferred. During the winding of the coil, the layers of the coil are staggered in the oblique mold to create the overall coil inclination β. The setting of the oblique coils 4 makes the magnetic lines of force distributed along the oblique direction, and the magnetic chains formed by the magnetic particles are also obliquely distributed along the magnetic lines of force. At this time, the vertical component of the water flow Fz can generate an impact force on the entire magnetic chain, which is more conducive to breaking up the magnetic chain. In the electromagnetic separator, the force F exerted by the water flow on the minerals can be decomposed into Ft (tangential), Fr (radial), and Fz (vertical). Fz has the widest range and the greatest intensity among the three components of the water flow. The setting of the inclined coil 4 makes the magnetic lines of force oblique in the sorting space, and the magnetic chains formed by the magnetic particles are also distributed obliquely along the magnetic lines of force. Due to the oblique distribution of the magnetic chains, the upward component of the water flow, Fz, can form a highly efficient impact on the magnetic chains, breaking them in half and separating the ilmenite particles.

[0038] The tail control coil 2 is located at the very top of the entire coil group. It can prevent magnetic particles from being breached by the last magnetic field defense line and overflowing into tailings. In order to ensure the tail control effect and reduce the MFe grade of the tailings, the number of turns of the tail control coil 2 is determined to be 2 to 2.5 times the number of turns of the inclined coil 4.

[0039] The concentrate gathering coil is located at the bottom of the entire coil group. Its function is to ensure that the sorted concentrate remains in the concentrate cone 8 and is not impacted by the water flow into the sorting zone for further ineffective sorting. In order to ensure the concentrate gathering effect and to avoid the magnetic field of the concentrate gathering coil interfering with the magnetic field of the sorting coil, the number of turns of the concentrate gathering coil is determined to be 1.2 to 1.5 times the number of turns of the inclined coil 4.

[0040] In order to enable the slurry to form a vortex in the sorting zone, multiple ore outlet slots are arranged circumferentially on the side of the bottom end of the ore feed pipe 1-3. Each ore outlet slot is equipped with an arc-shaped flow guide structure. The arc-shaped flow guide structure of the ore feed pipe 1-3 and the upper water distribution pipe form a synergistic vortex in the direction of water discharge, which enhances the effect of magnetic particles moving towards the high magnetic field area of ​​the cylinder wall in the scavenging zone and increases the adsorption probability of magnetic particles. The arc-shaped flow guide structure includes an arc-shaped plate 1-1 and a baffle 1-2 respectively set on both sides of the ore outlet slot. The outer end of the arc-shaped plate 1-1 and the baffle 1-2 form a flow guide port, so that the outwardly diverging slurry forms a vortex under the action of the arc plate and the baffle 1-2.

[0041] The rinsing device 5 includes a water collection cylinder 5-6 connected to an external water source. Multiple lower water distribution pipes 5-3 are arranged in a circumferential array at the bottom of the side of the water collection cylinder 5-6. Each lower water distribution pipe 5-3 has an inclined outlet pipe 5-2 at the top end near the wall of the sorting cylinder 3. The water outlet direction of the inclined outlet pipe 5-2 is obliquely upward and points into the cylinder. The angle θ between the inclined outlet pipe 5-2 and the horizontal plane is preferably 40°~80°. The water outlet direction of the inclined outlet pipe 5-2 can avoid the formation of circumferential tangential swirl. Multiple upper water distribution pipes 5-1 are arranged in a circumferential array at the top of the side of the water collecting cylinder 5-6. The end of the upper water distribution pipe 5-1 away from the water collecting cylinder 5-6 is a bend. In order to enhance the water spray speed at the outlet, the outlet end of the bend has a flat structure. The cross-sectional area of ​​the outlet formed by the outlets D1 and D2 of the bend is less than 2 / 3 of the inner diameter of the upper water distribution pipe 5-1. The outlet of the bend is located near the inner wall of the separation cylinder 3. Multiple upper water distribution pipes 5-1 can form a circumferential tangential water flow on the inner wall of the scavenging zone, so that the water outlet direction of the upper water distribution pipe 5-1 corresponds to the water outlet direction of the arc-shaped guide structure. This makes the swirling direction of the feed pipe 1-3 and the swirling direction of the upper water distribution pipe 5-1 superimpose in the same direction, which can significantly enhance the swirling effect of the scavenging zone, increase the centrifugal force of the slurry solid particles in this area, and make the magnetic particles move towards the high magnetic field area of ​​the cylinder wall, which is beneficial for tailing control.

[0042] In order to enhance the water flow rate of the lower water distribution pipe 5-3 and the upper water distribution pipe 5-1, the water collection cylinder 5-6 in this technical solution is connected to an external water source through the middle water inlet pipe 5-5 and the lower water inlet pipe 5-4. The middle water inlet pipe 5-5 is connected to the bottom of the water collection cylinder 5-6 to meet the water supply of the lower water distribution pipe 5-3. The lower water inlet pipe 5-4 extends to the top of the inside of the water collection cylinder 5-6 to meet the water supply of the upper water distribution pipe 5-1.

[0043] The lower part of the ore feed pipes 1-3 within the entire sorting cylinder 3 is the refining zone. The water flow from the lower water distribution pipe 5-3 in this zone has no tangential force Ft. Therefore, the slurry rotates at a low speed or not at all in the refining zone, and magnetic particles do not aggregate towards the cylinder wall under the centrifugal force of rotation, thus avoiding the problem of magnetic particles agglomerating towards the cylinder wall due to centrifugal force. Simultaneously, the upward-sloping outlet increases the interaction strength of Fz and Fr, which helps to disperse the magnetic chains. It can flush the magnetic agglomerates accumulated in the high-field-strength area of ​​the cylinder wall to the central weak magnetic field area, reducing the volume and intensity of the magnetic agglomerates and increasing the actual sorting area. Therefore, the water outlet direction in the refining zone solves the problem in existing technologies where the high-speed rotation of the slurry caused by the tangential water supply from the lower water pipe results in excessive centrifugal force, leading to a large number of magnetic particles agglomerating towards the cylinder wall and producing large-volume, high-strength magnetic agglomerates, which is more conducive to refining.

[0044] The main water flow forces acting in the selection zone are Fz and Fr. Fr points towards the center of the selection cylinder 3, mainly to push the magnetic agglomerates concentrated in the high magnetic field area on the inner wall of the selection cylinder 3 to the weak magnetic field area in the middle, so as to reduce the volume of the agglomerates, weaken the intensity of the magnetic agglomeration, and increase the actual selection area. Fz is parallel to the cylinder axis and is used to break up the magnetic chains and flush out the gangue and weak magnetic impurities. Its main function is to carry out the selection operation of removing impurities. The combined effect of Fr and Fz makes the magnetic chains smaller, more evenly distributed, less agglomerated, and easier to break up.

[0045] The upper part of the outlet of the feed pipes 1-3 in the entire sorting cylinder 3 is the scavenging zone. Its main function is to attract and recycle the strongly magnetic minerals that are mistakenly washed into the scavenging zone, thereby reducing the grade of the tailings. The water vortex intensity in the upper layer of the scavenging zone is high, and the feed vortex and the upper layer water vortex are superimposed in the same direction, resulting in a stronger rotational effect. This allows the mineral particles in the scavenging zone to move towards the high magnetic field area of ​​the cylinder wall under the action of rotational centrifugal force, increasing the adsorption probability of magnetic particles and making it more conducive to tailings control.

[0046] During operation, the precision-leveling coil and the tail-controlling coil are energized with a constant DC current, while multiple sets of inclined coils are energized with asynchronous low-frequency pulse DC current. The magnitude of the DC current energized in the precision-leveling coil, the tail-controlling coil, and the inclined coils can all be adjusted. Figure 14 As shown, the pulse duty cycle k (the proportion of energized time to the total cycle time in one cycle) of each group of inclined coils can be adjusted independently as needed. Preferably, the pulse duty cycle k of the low-frequency pulsed DC current supplied to each group of inclined coils from top to bottom decreases from 80% to 20% in stages. This allows for control of the washing intensity of the magnetic field on the minerals, which is more conducive to the removal of impurities. Where: k=T on / T, T on T is the pulse conduction time, representing the time during which the slant coil is energized, has current, and generates a magnetic field within one cycle; T is the pulse period, representing the total working time of a complete working cycle of a set of slant coils (energization time + de-energization time).

[0047] Example 2 like Figure 2 Middle (b) and Figure 13 As shown, the difference between this embodiment and embodiment 1 is that multiple sets of oblique coils 4 are arranged in parallel to each other, and the spacing between each pair of adjacent rows of oblique coils 4 is equal. The parallel combination of oblique coils 4 results in a large range of oblique magnetic flux in space, which also increases the probability of gangue and weak magnetic impurities being flushed out, which is beneficial for purification.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A slanted coil electromagnetic separator for separating weakly magnetic impurities from strongly magnetic concentrates, characterized in that, The device includes a sorting cylinder, a feeding device, and a washing device. The feeding pipe of the feeding device extends from the top of the sorting cylinder into the interior of the sorting cylinder. The bottom end of the sorting cylinder is a concentrate cone. The washing device is located between the concentrate cone and the feeding pipe. From bottom to top, the outer side of the sorting cylinder is provided with a concentrate gathering flat coil, multiple sets of inclined coils, and a tail control flat coil. The concentrate gathering flat coil and the tail control flat coil are both horizontally arranged, and each set of inclined coils is inclined.

2. The inclined coil electromagnetic separator for separating weakly magnetic impurities from strongly magnetic concentrate according to claim 1, characterized in that, The angle β between the inclined coil and the horizontal plane is 10°~30°.

3. The inclined coil electromagnetic separator for separating weakly magnetic impurities from strongly magnetic concentrate according to claim 2, characterized in that, The multiple rows of oblique coils are arranged in a zigzag pattern along the vertical direction.

4. The inclined coil electromagnetic separator for separating weakly magnetic impurities from strongly magnetic concentrate according to claim 2, characterized in that, The multiple rows of inclined coils are parallel to each other, and the spacing between any two adjacent rows of inclined coils is equal.

5. The inclined coil electromagnetic separator for separating weakly magnetic impurities from strongly magnetic concentrate according to claim 1, characterized in that, The fine-tuning coil and the tail-controlling coil are energized with constant DC current, while the multiple sets of inclined coils are energized with asynchronous low-frequency pulsed DC current. The pulse duty cycle k of the low-frequency pulsed DC current energized by the multiple sets of inclined coils from top to bottom decreases in stages from 80% to 20%, where: k = T on / T, T on T is the pulse conduction time, representing the time during which the slant coil is energized, has current, and generates a magnetic field within one cycle; T is the pulse period, representing the total working cycle time of a set of slant coils.

6. The inclined coil electromagnetic separator for separating weakly magnetic impurities from strongly magnetic concentrate according to claim 1, characterized in that, The number of turns of the control tail flat coil is 2 to 2.5 times that of the slant coil, and the number of turns of the fine-tuning flat coil is 1.2 to 1.5 times that of the slant coil.

7. The inclined coil electromagnetic separator for separating weakly magnetic impurities from strongly magnetic concentrate according to claim 1, characterized in that, The bottom end of the feed pipe has ore outlet slots arranged in a circumferential array along its side, and each ore outlet slot has an arc-shaped flow guide structure. The flushing device includes a water collection cylinder connected to an external water source. Multiple lower water distribution pipes are arranged in a circumferential array at the bottom end of the side of the water collection cylinder. Each lower water distribution pipe has an inclined outlet pipe at its top end near the wall of the sorting cylinder, which is inclined inward. The water outlet direction of the inclined outlet pipe is obliquely upward and points into the cylinder. The angle θ between the inclined outlet pipe and the horizontal plane is 40°~80°. Multiple upper water distribution pipes are arranged in a circumferential array at the top end of the side of the water collection cylinder. The water outlet direction of the upper water distribution pipe corresponds to the water outlet direction of the arc-shaped flow guide structure.

8. The inclined coil electromagnetic separator for separating weakly magnetic impurities from strongly magnetic concentrate according to claim 7, characterized in that, The arc-shaped flow guiding structure includes arc-shaped plates and baffles respectively set on both sides of the ore outlet, and a flow guiding port is formed between the outer end of the arc-shaped plate and the baffle.

9. The inclined coil electromagnetic separator for separating weakly magnetic impurities from strongly magnetic concentrate according to claim 7, characterized in that, The end of the upper water distribution pipe away from the water collection cylinder is a bend, and the outlet end of the bend has a flat structure.

10. The inclined coil electromagnetic separator for separating weakly magnetic impurities from strongly magnetic concentrate according to claim 7, characterized in that, The water collection cylinder is connected to an external water source through a middle water inlet pipe and a lower water inlet pipe. The middle water inlet pipe is connected to the bottom of the water collection cylinder, and the lower water inlet pipe extends to the top of the inside of the water collection cylinder.

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