A dual-machine linked semi-countercurrent magnetic separation device

Abstract

The present application discloses a dual-machine semi-countercurrent magnetic separation device, comprising a magnetic separation device 1 and a magnetic separation device 2 of the same structure and symmetrically installed, wherein the magnetic separation device 1 and the magnetic separation device 2 both comprise a box trough, in which a cylinder is rotatably installed, and a sorting plate is provided under the cylinder. The present application provides a dual-machine semi-countercurrent magnetic separation device, which sets a material box at the top of the cylinder, and the slurry is sprayed on the surface of the cylinder through the discharge pipe and then flows downward and hits the protrusion, thereby promoting the separation of magnetic particles and non-magnetic particles, and utilizing two symmetrically arranged cylinders to block the slurry thrown off by centrifugal action, and the slurry hits the blocked cylinder to further promote the separation of magnetic and non-magnetic particles and flow along the current cylinder surface, and pre-screens the magnetic particles in the slurry through the pre-screening magnetic system, thereby prolonging the time for the magnetic particles to be adsorbed, and increasing the probability of the magnetic particles being adsorbed on the cylinder surface, thereby achieving the purpose of improving the concentrate grade.

Description

Technical Field

[0001] The present invention relates to the field of magnetic separation technology, in particular to a dual-machine linked semi-countercurrent magnetic separation device. Background Art

[0002] The wet permanent magnet drum magnetic separator (CTB type) for iron ore separation consists of a drum, a magnetic system, a tank, and a transmission mechanism. The production process is briefly described as follows: Water-quenched slag from a rotary kiln is ground in a ball mill. The resulting fine powder is then mixed with water to form a slurry. The slurry flows evenly through a feed pipe into a dewatering tank. Pressure forces it upward into the separation chamber, where the magnetic field acts. The chamber entrance is located precisely within the magnetic field, causing the slurry to rise vertically and adhere to the drum surface. As the drum rotates, ferromagnetic materials are drawn out of the magnetic field, freed from the magnetic field, and then, under the influence of gravity and flushing water, flow into the concentrate tank. The alternating N / A polarity of the magnetic field causes ferromagnetic materials to flip as they exit the separation chamber, effectively removing non-ferromagnetic materials and producing a higher-grade concentrate. Weakly magnetic and non-magnetic minerals are discarded, while strongly magnetic minerals adsorbed on the drum surface are drawn out of the magnetic field by the drum's rotation and flushed into the concentrate tank by flushing water. When the slurry enters the magnetic field, the strongly magnetic minerals in it are adsorbed on the surface of the drum. When the slurry fills the separation chamber, it flows in the countercurrent direction of the drum. After a long period of strong magnetic field sweeping, the ferromagnetic materials are fully separated and discharged from the tailings, making the tailings of lower grade.

[0003] For the semi-countercurrent drum magnetic separation device currently used in the market, since the magnetic poles are located inside the cylinder and the separation chamber also has a certain height, the slurry passes through the separation chamber outside the cylinder. In the process of magnetic particles being attracted by the magnetic force and moving toward the cylinder, the magnetic particles are hindered by the resistance of the slurry and their own gravity. Magnetic particles with weak magnetic attraction find it difficult to approach the cylinder and be adsorbed on the cylinder, which affects the separation of magnetic particles. In addition, if the viscosity of the slurry is high, the magnetic particles are more tightly wrapped by non-magnetic particles. The effect of separating magnetic particles from non-magnetic particles by magnetic stirring alone in a short separation chamber is often poor. A large amount of magnetic particles are mixed in the tailings, which increases the tailings grade. Conversely, the concentrate after sorting contains a large amount of non-magnetic particles, which reduces the grade. Both of these lead to incomplete separation of magnetic particles. Summary of the Invention

[0004] The present application proposes a dual-machine semi-countercurrent magnetic separation device, which has the advantages of promoting magnetic particles to approach the cylinder and having good separation performance between magnetic particles and non-magnetic particles, so as to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solution: a semi-countercurrent magnetic separation device with dual linkage, including a magnetic separation device 1 and a magnetic separation device 2 with the same structure and symmetrical installation, the magnetic separation device 1 and the magnetic separation device 2 both include a box trough, a cylinder is rotatably installed in the box trough, a sorting plate is provided under the cylinder, an inclined water hole is provided on the sorting plate, and an inclined water hole is inclined toward the rotating side of the cylinder. The center line of the cross section of the inclined water hole is tangent to the outer wall of the cylinder, a material box is provided above the cylinder, a pre-screening magnetic system is provided inside the cylinder, the two box troughs are connected to each other on one side with a mixing trough, and a jet mechanism for pumping water to the inclined water hole is provided in the box trough.

[0006] Furthermore, flushing water pipes are installed above the two material boxes, and the outlet ends of the two material boxes on the side close to each other are connected to the discharge pipe. A top cover located between the two material boxes is installed on the top of the box trough. The top cover is arc-shaped and is located above the discharge pipe. Flushing pipes are provided below both ends of the top cover. A spray gap is formed between the discharge pipe and the top cover. The flushing pipe is provided with a water spray port facing the spray gap, and protrusions are evenly arranged on the outer wall of the cylinder.

[0007] Furthermore, the jet mechanism includes a water balancing trough, a water pumping trough, a water storage trough, a water inlet component 1 and a water inlet component 2. The water balancing trough is arranged below the sorting plate, and a water inlet one-way valve is installed on the water balancing trough. A water pumping trough is arranged on each side below the water balancing trough, and a water pushing plate is slidably connected to the interior of each water pumping trough. The water storage trough is arranged on the outer wall of the sorting plate and the water pumping trough and is located at the outlet end of the sorting trough. The top wall of the water storage trough is a smooth arc and is tangent to the surface of the sorting plate. A water storage hole is provided on the top wall of the water storage trough. A water pumping one-way valve is installed on the inner wall of the water pumping trough. The inlet end of the water pumping one-way valve is located at the bottom of the inner cavity of the water storage trough, and the outlet end of the water pumping one-way valve is located at the top of the inner cavity of the water pumping trough. Water inlet component 1 and water inlet component 2 are respectively provided at the bottom ends of the two push plates. Water inlet component 1 and water inlet component 2 are respectively used to push the respectively connected push plates to move up and down in the corresponding water pumping trough.

[0008] Furthermore, the water inlet component 1 includes an outer cover, a cam, an axle, a push rod, a cover, and a spring. The outer cover is arranged below the water pumping trough, the cam is located inside the outer cover, the axle is connected to the shaft hole of the cam, the push rod is connected to the bottom wall of the water pushing plate, the bottom end of the push rod is connected to the cover, the cover is in the shape of a bowl with the opening facing upward, the outer wall of the cover is in contact with the outer wall of the cam, the outer periphery of the push rod is sleeved with a spring, and the two ends of the spring are respectively squeezed on the outer wall of the water pumping trough and the inner wall of the cover. The cam in the water inlet component 2 and the cam in the water inlet component 1 are arranged in a centrally symmetrical state and share a common axle.

[0009] Furthermore, flow control gates are provided at the connecting points on both sides of the mixing trough, one end of the flow control gate is connected to a plate shaft, and the other end of the flow control gate is rotated and sealed on the box trough through a shaft rod, the plate shaft is rotated and sealed with the box trough, the end of the plate shaft is sleeved with a gear, and a seat box mounted on the frame is provided below the gear, the interior of the seat box is slidably connected with a rack, the gear is engaged with the rack, an electric telescopic rod is installed inside the seat box, the driving end of the electric telescopic rod is fixedly connected to the end of the rack, the gears of the magnetic separation device 1 and the magnetic separation device 2 are engaged on the same rack, the outer periphery of the plate shaft is sleeved with an axle seat, and the axle seat is installed on the outer wall of the seat box.

[0010] Furthermore, a magnetic shaft is rotatably sleeved in the middle of the cylinder, and a main screening magnetic system and a pre-screening magnetic system are installed on the two magnetic shafts. The main screening magnetic system and the pre-screening magnetic system are both composed of a number of alternating magnetic poles. The pre-screening magnetic system is located inside the cylinder near the outlet end of the material box. The two ends of the cylinder are respectively connected to end cover one and end cover two. The magnetic shaft passes through end cover one and is connected to an adjusting arm. The magnetic shaft is rotatably connected to end cover one. One end of the magnetic shaft located inside the cylinder is rotatably sleeved with a barrel shaft, which passes through end cover two and is fixedly connected to end cover two. The barrel shaft is connected to the rotating shaft of the motor through a transmission, and the motor is installed on the frame.

[0011] Furthermore, the box trough is provided with a feed trough, a sorting trough, a tailings trough and a tailings pipe which are connected in sequence. The feed trough is connected with the mixing trough. The box trough is provided with a concentrate hopper located on the side of the cylinder. A ore unloading water pipe is installed above the concentrate hopper. An arc-shaped scraping arc plate is provided on the top of the outer trough wall of the tailings trough. The scraping arc plate is tangent to the arc-shaped outer trough wall of the sorting plate. A mineral particle gap is formed between the scraping arc plate and the cylinder. The width of the mineral particle gap is between one third and one half of the width of the sorting trough.

[0012] The present invention has the following beneficial effects:

[0013] 1. The present application provides a dual-machine semi-countercurrent magnetic separation device, which sets the material box at the top of the cylinder. The slurry is sprayed onto the surface of the cylinder through the discharge pipe and then flows downward and hits the protrusion, thereby promoting the separation of magnetic particles and non-magnetic particles. The two symmetrically arranged cylinders are used to block the slurry thrown off by centrifugal action. The slurry hits the blocked cylinder to further promote the separation of magnetic and non-magnetic particles and flow along the current cylinder surface. The magnetic particles in the slurry are pre-screened by the pre-screening magnetic system, which prolongs the time for the magnetic particles to be adsorbed and increases the probability of the magnetic particles being adsorbed on the cylinder surface, thereby achieving the purpose of improving the concentrate grade.

[0014] 2. The present application provides a dual-machine semi-countercurrent magnetic separation device, which sets a material box at the top of the cylinder. The slurry is sprayed onto the surface of the cylinder through the discharge pipe and then flows downward and hits the protrusion. The slurry generates small eddies at the protrusion, which promotes the mutual flow of the inner and outer layers of the slurry, allowing the outer layer of the slurry to approach the cylinder, which is conducive to the contact of the magnetic particles in the outer layer of the slurry with the cylinder, further increasing the probability of contact between the magnetic particles and the cylinder, thereby achieving the purpose of improving the sorting effect.

[0015] 3. The present application provides a dual-machine linked semi-countercurrent magnetic separation device, which opens an inclined water hole on the sorting plate and uses water inlet component 1 and water inlet component 2 to alternately suck and push water, so that there is always water in the water equalization chamber of the water equalization trough and is sprayed into the sorting trough through the inclined water hole. Since the inclined water hole is inclined toward the direction of rotation of the cylinder and the center line of the inclined water hole is tangent to the outer wall of the cylinder, the water flow is used to impact the slurry in the sorting trough toward the inlet end of the sorting trough, slowing down the flow speed of the slurry in the sorting trough, increasing the residence time of the slurry in the sorting trough, and increasing the probability of magnetic mineral particles being adsorbed on the outer wall of the cylinder under the action of the main screen magnetic system. The water flow sprayed from the inclined water hole prompts the slurry to flow toward the outer wall of the cylinder, shortening the distance between the magnetic particles and the main screen magnetic system, further increasing the probability of magnetic particles being adsorbed on the outer wall of the cylinder, and achieving the purpose of improving the grade of the concentrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments disclosed herein and, together with the description, serve to explain the principles disclosed herein.

[0017] The present disclosure can be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0018] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this application;

[0019] Figure 2 This is a cross-sectional view of the present application;

[0020] Figure 3 This is a cross-sectional view of the structure of the jet mechanism of this application;

[0021] Figure 4 This is an exploded diagram of the cylinder, main screen magnetic system and pre-screen magnetic system structure of this application;

[0022] Figure 5 This is a schematic diagram of the partial three-dimensional structure of this application;

[0023] Figure 6 This is an exploded diagram of the structure of the sorting plate and jet mechanism of this application;

[0024] Figure 7 This is a schematic diagram of the structure of water component 1 and water component 2 of this application;

[0025] Figure 8 This is a structural diagram of the flow control gate of this application;

[0026] Figure 9 This is a partial module diagram of the control system of this application.

[0027] In the figure: 1000, magnetic separation device 1; 1001, magnetic separation device 2; 100, box trough; 1, cylinder; 101, end cover 1; 102, end cover 2; 2, magnetic system shaft; 21, cylinder shaft; 3, main screen magnetic system; 301, pre-screen magnetic system; 4, material box; 41, flushing water pipe; 42, discharge pipe; 43, top cover; 44, flushing pipe; 5, sorting plate; 51, feed trough; 52, sorting trough; 53, tailings trough; 54, tailings pipe; 55, concentrate hopper; 56, unloading water pipe; 501, inclined water hole; 6, scraper arc plate; 7, mixing trough; 8, flow control gate Plate; 81, plate shaft; 82, gear; 83, rack; 84, seat box; 85, electric telescopic rod; 86, axle seat; 9, jet mechanism; 91, water trough; 911, water inlet check valve; 92, water extraction trough; 921, water push plate; 93, water storage trough; 931, water storage hole; 932, water extraction check valve; 94, water inlet component one; 941, outer cover; 942, cam; 943, wheel axle; 944, push rod; 945, cover; 946, spring; 95, water inlet component two; 10, protrusion; 11, frame; 12, motor; 13, adjustment arm. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] See also Figure 1 , Attachment Figure 2 , Attachment Figure 3 , Attachment Figure 4 , Attachment Figure 5 , Attachment Figure 6 , Attachment Figure 7 , Attachment Figure 8As shown, a dual-machine semi-countercurrent magnetic separation device includes a first magnetic separation device 1000, a second magnetic separation device 1001, and a frame 11. The first magnetic separation device 1000 and the second magnetic separation device 1001 have the same structure and are symmetrically mounted on the frame 11, with the first magnetic separation device 1000 located to the right of the second magnetic separation device 1001. The first magnetic separation device 1000 and the second magnetic separation device 1001 both include a tank 100, each of which is equipped with a rotating cylinder 1. The two cylinders 1 rotate in opposite directions, i.e., the cylinder 1 of the first magnetic separation device 1000 rotates counterclockwise, while the cylinder 1 of the second magnetic separation device 1001 rotates clockwise. The outer walls of the two cylinders 1 are evenly provided with protrusions 10. The middle of each cylinder 1 is rotatably sleeved with a magnetic system shaft 2. The main screening magnetic system 3 and the pre-screening magnetic system 301 are mounted on the two magnetic system shafts 2. The top of each of the two box troughs 100 is equipped with a material box 4 located directly above the cylinder 1, and each of the two box troughs 100 is provided with a sorting plate 5 located below the cylinder 1. The two box troughs 100 are provided with a mixing trough 7 on the side close to each other, and a jet mechanism 9 is provided at the sorting plate 5 in the box trough 100.

[0030] See Figure 1 and attached Figure 2 As shown, the two tanks 100 are each provided with a feed tank 51, a separation tank 52, a tailing tank 53 and a tailing pipe 54 which are connected in sequence, wherein the inlet end of the feed tank 51 is connected to the mixing tank 7 and a flow control gate 8 is provided at the connection point, the magnetic separation device 1 1000 and the magnetic separation device 2 1001 share a mixing tank 7, the mixing tank 7 is in a bilaterally symmetrical state and the axis of symmetry is the axis of symmetry of the magnetic separation device 1 1000 and the magnetic separation device 2 1001. The tank 100 is provided with a concentrate hopper 55 located on the side of the cylinder 1, and an ore unloading water pipe 56 is installed above the concentrate hopper 55. When the flow control gate 8 is deflected, the mixing tank 7 is connected to the feed tank 51, and the slurry in the mixing tank 7 flows along the feed tank 51, the separation tank 52, the tailing tank 53 and the tailing pipe 54, and the magnetic ore particles in the slurry are magnetically screened in the separation tank 52. See the attached Figure 2 , Attachment Figure 3 , Attachment Figure 5 As shown, an arc-shaped scraper arc plate 6 is integrally formed at the top of the outer trough wall of the tailings trough 53. The scraper arc plate 6 is tangent to the arc-shaped outer trough wall of the tailings trough 53. A mineral particle gap is formed between the scraper arc plate 6 and the cylinder 1. The width of the mineral particle gap is between one-third and one-half of the width of the sorting trough 52. The width of the mineral particle gap is the vertical distance between the end of the scraper arc plate 6 and the outer wall of the cylinder 1. The width of the sorting trough 52 is the vertical distance between the surface of the sorting plate 5 and the outer wall of the cylinder 1.

[0031] See attached Figure 1 , Attachment Figure 2 , Attachment Figure 4As shown, the two ends of the cylinder 1 are respectively connected to the end cover 101 and the end cover 2 102, the magnetic system shaft 2 passes through the end cover 101 and is connected to the adjustment arm 13, the magnetic system shaft 2 is rotatably connected to the end cover 101, and the magnetic system shaft 2 independently drives the main screening magnetic system 3 and the pre-screening magnetic system 301 to rotate. The main screening magnetic system 3 and the pre-screening magnetic system 301 are both composed of a number of alternating magnetic poles. With reference to the existing magnetic system structure, the magnetic system shaft 2 is driven to rotate by pushing the adjustment arm 13, and then the main screening magnetic system 3 and the pre-screening magnetic system 301 are driven to rotate to achieve the function of adjusting the angles of the main screening magnetic system 3 and the pre-screening magnetic system 301. In application, the angles of the main screening magnetic system 3 and the pre-screening magnetic system 301 can be adjusted according to the concentrate grade requirements. The pre-screening magnetic system 301 of the magnetic separation device 1000 and the magnetic separation device 2 1001 are both located on the side of the cylinder 1 close to the mixing tank 7. One end of the magnetic shaft 2, located within the cylinder 1, is rotatably coupled to a cylindrical shaft 21. Cylindrical shaft 21 extends through and is fixedly connected to end cap 102. Cylindrical shaft 21 is connected to the rotating shaft of motor 12 via a transmission, which is mounted on frame 11. During operation, motor 12 is started, and the speed of its rotating shaft is adjusted via the transmission. The transmission's output shaft drives cylindrical shaft 21, which in turn rotates cylinder 1 via end cap 102. Because magnetic shaft 2 is rotationally coupled to cylindrical shaft 21, the rotation of cylindrical shaft 21 and magnetic shaft 2 are independent of each other.

[0032] See also Figure 1 , Attachment Figure 2 and attached Figure 5As shown, a flushing water pipe 41 is installed above the material box 4, and a discharge pipe 42 is connected to the side of the material box 4. The discharge pipe 42 is located on one side of the pre-screening magnetic system 301 and the discharge port of the discharge pipe 42 is perpendicular to the outer wall of the cylinder 1. The top of the box trough 100 is installed with a top cover 43 located between the two material boxes 4 of the magnetic separation device 1000 and the magnetic separation device 2 1001. The top cover 43 is arc-shaped, and the lowest point of the top cover 43 is located on the symmetry axis of the magnetic separation device 1000 and the magnetic separation device 2 1001. The top cover 43 is located above the discharge pipe 42. Flushing pipes 44 are provided below both ends of the top cover 43. A spray gap is formed between the discharge pipe 42 and the top cover 43. The flushing pipe 44 is provided with a water spray port facing the spray gap. During use, the water pipe 41 sprays water into the hopper 4. This water dilutes and disperses the slurry in the hopper 4, suspending it and ejecting it outward along the discharge pipe 42 onto the outer wall of the cylinder 1. The impact force separates the magnetic particles encapsulated by the non-magnetic particles in the slurry, facilitating the screening of the magnetic particles. The slurry then flows downward along the outer wall of the cylinder 1. The magnetic particles in the slurry are attracted to the outer wall of the cylinder 1 by the magnetic field force of the pre-screening magnetic system 301. By adjusting parameters such as the rotation speed of the cylinder 1 and the amount of slurry ejected from the discharge pipe 42, the slurry ejected onto the outer wall of the cylinder 1 has a velocity difference relative to the surface of the cylinder 1, allowing the slurry to flow downward along the surface of the cylinder 1. As the slurry flows downward along the surface of the cylinder 1, the magnetic particles encapsulated by the non-magnetic particles collide with the protrusions 10, further separating the magnetic particles from the non-magnetic particles and facilitating the attraction of the magnetic particles to the outer wall of the cylinder 1. The magnetic mineral particles adsorbed on the surface of the cylinder 1 enter the sorting tank 52 for secondary screening as the cylinder 1 rotates; the ore pulp, non-magnetic mineral particles and some magnetic mineral particles that are still not adsorbed on the outer wall of the cylinder 1 flow downward along the outer wall of the cylinder 1 along the ore pulp and gather in the mixing tank 7 under the scraping of the scraper arc plate 6. The ore pulp in the mixing tank 7 will enter the sorting tank 52 along the feed tank 51 for secondary sorting after the gate plate 8 is opened.

[0033] While the slurry is being ejected onto the outer wall of cylinder 1 through discharge pipe 42, the corresponding motor 12 is activated, driving the cylinders 1 of magnetic separation device 1000 and magnetic separation device 2 1001 to rotate. Magnetic separation device 1000 rotates counterclockwise, while magnetic separation device 2 1001 rotates clockwise. Due to centrifugal action, some of the slurry on the outer walls of both cylinders 1 detaches from the outer wall of the current cylinder 1. The ejected slurry falls directly into mixing trough 7 or adheres to the outer wall of the opposite cylinder 1, the outer wall of the opposite discharge pipe 42, or the surface of top cover 43. The impact force further separates the non-magnetic particles from the magnetic particles in the slurry, facilitating the subsequent screening of the magnetic particles. Water jetted from the nozzles of flushing pipe 44 contacts the outer walls of discharge pipe 42 and top cover 43 at the gap between the jets and flows along their surfaces. Water from discharge pipe 42 flows onto the outer wall of cylinder 1, while water from top cover 43 flows toward the lowest point in the center of top cover 43 and falls downward from its surface into mixing trough 7. The ore slurry adhering to the outer wall of the opposite cylinder 1 flows downward along with the slurry on that outer wall, where it is attracted and screened by the magnetic field of pre-screening magnetic system 301. Magnetic ore particles adsorbed by the magnetic field of pre-screening magnetic system 301 rotate with cylinder 1 to separation trough 52. There, they undergo the main screening process under the action of main screening magnetic system 3 and, as cylinder 1 rotates, move to concentrate hopper 55. Flushed by discharge water pipe 56, they fall off the outer wall of cylinder 1 and gather in concentrate hopper 55, becoming concentrated ore.

[0034] In this application, in order to ensure that the slurry flowing out of the discharge pipe 42 flows downward along the outer wall of the cylinder 1 at a speed greater than the linear speed of the cylinder 1 rotation, so that the slurry can collide with the protrusion 10 when flowing along the surface of the cylinder 1, thereby promoting the separation of magnetic and non-magnetic mineral particles in the slurry. The slurry and the cylinder satisfy the following formula:

[0035]

[0036] Where, ρ is the pulp density;

[0037] is the assumed degree of gravity;

[0038] is the slurry film thickness;

[0039] is the dynamic viscosity of the slurry and the cylinder;

[0040] is the cylinder radius;

[0041] ω is the angular velocity of the cylinder.

[0042] See attached Figure 2, Attachment Figure 6 , Attachment Figure 7 As shown, when the slurry flowing downward along the outer wall of the cylinder 1 reaches the scraper arc 6, most of the slurry in the outer layer of the slurry flow on the outer wall of the cylinder 1 is blocked by the scraper arc 6 and flows downward along the surface of the scraper arc 6, while the magnetic mineral particles adsorbed on the outer wall of the cylinder 1 under the magnetic attraction of the pre-screening magnetic system 301 enter the separation tank 52 from the gap between the mineral particles; the slurry scraped by the scraper arc 6 flows downward along the outer walls of the scraper arc 6 and the tailings tank 53 and accumulates in the mixing tank 7. The scraper arc plate 6 is used to scrape off the magnetic particle slurry with a low content of magnetic particles on the outer layer of the slurry flow or the magnetic particles are wrapped by non-magnetic particles and are not easily adsorbed on the surface of the cylinder 1. This part of the slurry enters the mixing tank 7 and flows through the feed tank 51 to the sorting tank 52. The flow direction of the slurry in the sorting tank 52 is opposite to the rotation direction of the cylinder 1. The impact of the slurry and the surface of the cylinder 1 can further promote the separation of magnetic particles and non-magnetic particles to achieve the beneficial effect of semi-countercurrent sorting, thereby achieving the secondary sorting of magnetic particles. This is the main purpose of setting the scraper arc plate 6 in this application. If the scraper arc plate 6 is not set to scrape off the outer layer of slurry, the flow direction of the slurry in the sorting tank 52 is the same as the rotation direction of the cylinder 1, and it does not have the impact sorting effect of semi-countercurrent sorting. By setting the scraper arc plate 6, the sorting effect of the magnetic particles in the slurry can be effectively improved, and the grade of the concentrate after sorting can be improved.

[0043] See attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 , Attachment Figure 5 and attached Figure 8 As shown, a flow control gate 8 is provided between the mixing tank 7 and the feed tank 51 of the magnetic separation device 1 1000 and the magnetic separation device 2 1001. The mixing tank 7 is enclosed by the tailings tank 53 of the magnetic separation device 1 1000 and the magnetic separation device 2 1001, the scraper arc plate 6 and the flow control gate 8. By adjusting the angle of the flow control gate 8, the opening between the mixing tank 7 and the feed tank 51 can be adjusted, thereby controlling the flow of the slurry from the mixing tank 7 to the feed tank 51. Figure 2 , Attachment Figure 3 , Attachment Figure 5 and attached Figure 8As shown, one end of the flow control gate 8 is connected to a plate shaft 81, and the other end of the flow control gate 8 is rotated and sealed on the box trough 100 through a shaft. The plate shaft 81 and the box trough 100 are rotated and sealed, and the sealing of the plate shaft 81 and the box trough 100 is generally achieved by a sealing ring. The end of the plate shaft 81 is sleeved with a gear 82, and a seat box 84 installed on the frame 11 is provided below the gear 82. The interior of the seat box 84 is slidably connected to a rack 83, and the gear 82 is engaged with the rack 83. An electric telescopic rod 85 is installed inside the seat box 84, and the driving end of the electric telescopic rod 85 is fixedly connected to the end of the rack 83. The gears 82 of the magnetic separation device 1 1000 and the magnetic separation device 2 1001 are engaged with the same rack 83. The outer periphery of the plate shaft 81 is sleeved with a shaft seat 86, and the shaft seat 86 is installed on the outer wall of the seat box 84. The shaft seat 86 supports and limits the plate shaft 81. Figure 8 For example, when the driving end of the electric telescopic rod 85 is extended to push the rack 83 forward, the two gears 82 drive their respective flow control gates 8 to rotate clockwise, thereby connecting the mixing tank 7 with the feed tanks 51 on both sides, and the slurry in the mixing tank 7 flows into the feed tanks 51 of the magnetic separation device 1 1000 and the magnetic separation device 2 1001.

[0044] See attached Figure 2 , Attachment Figure 3 , Attachment Figure 5 and attached Figure 6 , Attachment Figure 7 As shown, the sorting plate 5 is provided with an inclined water hole 501, which is inclined toward the inlet end of the sorting tank 52. Figure 3 As shown in the cross-sectional view of the middle inclined water hole 501, the center line of the cross section of the inclined water hole 501 is tangent to the outer wall of the cylinder 1. The water flow ejected from the inclined water hole 501 tilts the slurry in the sorting tank 52 toward the inlet end of the sorting tank 52, slowing down the flow of the slurry in the sorting tank 52 to the tailing tank 53, extending the time the slurry stays in the sorting tank 52, and increasing the probability of magnetic mineral particles adhering to the outer wall of the cylinder 1 under the magnetic attraction of the main screen magnetic system 3, thereby improving the grade of the concentrate after screening. In addition, since the center line of the cross section of the inclined water hole 501 is tangent to the outer wall of the cylinder 1, the water flow ejected from the inclined water hole 501 pushes the slurry in the sorting tank 52 toward the outer wall of the cylinder 1, shortening the distance between the magnetic mineral particles in the slurry and the outer wall of the cylinder 1, which is conducive to the adsorption of magnetic mineral particles on the outer wall of the cylinder 1, further improving the grade of the concentrate.

[0045] See attached Figure 2 , Attachment Figure 3 , Attachment Figure 5 and attached Figure 6 , Attachment Figure 7As shown, a jet mechanism 9 is provided in the box tank 100 and is located at the sorting plate 5. The jet mechanism 9 is used to spray water into the inclined water hole 501. The jet mechanism 9 includes a water averaging trough 91, a water extraction trough 92, a water storage trough 93, a water inlet component 1 94 and a water inlet component 2 95, wherein the water averaging trough 91 is provided below the sorting plate 5, and a water averaging cavity is enclosed between the water averaging trough 91 and the sorting plate 5, and a water inlet check valve 911 is installed on the water averaging trough 91; a water extraction trough 92 is provided on each side below the water averaging trough 91, and the two water extraction troughs 92 are respectively enclosed with the water averaging trough 91 to form two water extraction cavities, and the two water extraction cavities are connected to the water averaging cavity through the water inlet check valve 911, and a water push plate 921 is slidably connected to the interior of each water extraction trough 92; the water storage trough 93 is provided on the outer wall of the sorting plate 5 and the water extraction trough 92 and is located At the outlet end of the sorting trough 52, the top wall of the water storage trough 93 is in a smooth arc shape and is tangent to the surface of the sorting plate 5. The slurry in the sorting trough 52 flows smoothly along the surface of the sorting plate 5 to the surface of the water storage trough 93 and then flows into the tailings trough 53. A water storage hole 931 is provided on the top wall of the water storage trough 93. The aperture of the water storage hole 931 is smaller than the diameter of the particles in the slurry. A pumping check valve 932 is installed on the inner wall of the pumping trough 92. The inlet end of the pumping check valve 932 is located at the bottom of the inner cavity of the water storage trough 93, and the outlet end of the pumping check valve 932 is located at the top of the inner cavity of the pumping trough 92, so that the outlet end of the pumping check valve 932 is located above the water push plate 921. Figure 2 and attached Figure 3 As can be seen in the figure, the water storage tank 93 is located at the junction of the sorting tank 52 and the tailings tank 53. The slurry with magnetic mineral particles adsorbed in the sorting tank 52 flows into the tailings tank 53 along the surface of the sorting plate 5 and the water storage tank 93. When the slurry passes through the surface of the water storage tank 93, part of the water in the slurry enters the inner cavity of the water storage tank 93 through the filtration of the water storage hole 931. Most of the slurry mixed with mineral particles passes through the surface of the water storage tank 93 into the tailings tank 53 and is discharged from the tailings pipe 54. The discharged slurry is the tailings. The bottom ends of the two water pushers 921 are respectively provided with water inlet assembly 1 94 and water inlet assembly 2 95. Water inlet assembly 1 94 and water inlet assembly 2 95 are respectively used to push the connected water pushers 921 to move up and down in the corresponding pumping tank 92. The water inlet assembly 94 includes an outer cover 941, a cam 942, a wheel shaft 943, a push rod 944, a cover 945, and a spring 946. The outer cover 941 is set in the space between the inner wall of the tailings trough 53 and the outer wall of the water pumping trough 92. The cam 942 is located in the outer cover 941. The wheel shaft 943 is connected to the shaft hole of the cam 942. The push rod 944 passes through the bottom wall of the water pumping trough 92 and is connected to the bottom wall of the water push plate 921. The bottom end of the push rod 944 is connected to the cover 945. The cover 945 is in the shape of a bowl with an opening facing upward. The outer periphery of the push rod 944 is sleeved with a spring 946. The upper and lower ends of the spring 946 are respectively pressed against the outer wall of the water pumping trough 92 and the inner wall of the cover 945. Figure 6 and attached Figure 7The structure of the second water inlet assembly 95 is substantially the same as that of the first water inlet assembly 94. The difference is that the cam 942 in the second water inlet assembly 95 is arranged in a centrally symmetrical state with the cam 942 in the first water inlet assembly 94. However, the two cams 942 in the first water inlet assembly 94 and the second water inlet assembly 95 are coaxial and share a common axle 943. Therefore, when the long axis end of the cam 942 in the first water inlet assembly 94 is downward, the long axis end of the cam 942 in the second water inlet assembly 95 is upward. One end of the axle 943 is rotatably connected to the outer cover 941, and the other end of the axle 943 passes through the tank 100 and is sleeved on the rotating bracket. The rotating bracket is mounted on the frame 11. The end of the axle 943 is drivingly connected to the output shaft of the speed regulator. The input shaft of the speed regulator is drivingly connected to the barrel shaft 21. The speed of the barrel shaft 21 is adjusted by the speed regulator and then transmitted to the axle 943. The speed of the axle 943 can be freely adjusted by the speed regulator.

[0046] When in use, water is introduced into the flushing water pipe 41, and the water flow sprayed from the flushing water pipe 41 dilutes the slurry in the material box 4. The diluted slurry is sprayed onto the outer wall of the cylinder 1 through the discharge pipe 42 and flows downward along the outer wall of the cylinder 1. The outer layer of slurry on the outer wall of the cylinder 1 is scraped off by the scraper arc plate 6 and flows downward along the scraper arc plate 6 and accumulates in the mixing trough 7 until the mixing trough 7 stores enough slurry to be transported to the feeding troughs 51 on both sides. Then the electric telescopic rod 85 is started to extend and push the two flow control gates 8 to rotate, and the mixing trough 7 is connected to the feeding troughs 51 on both sides. The material box 4 continuously sprays the ore liquid onto the outer wall of the cylinder 1 through the discharge pipe 42. The ore liquid flows downward along the outer wall of the cylinder 1, and the preliminary screening of the magnetic mineral particles is achieved under the adsorption action of the pre-screening magnetic system 301. Since the slurry flows along the surface of the cylinder 1, the magnetic mineral particles in the slurry are close to the outer wall of the cylinder 1, and the magnetic mineral particles are easily adsorbed on the outer wall of the cylinder 1. When the slurry encounters the protrusion 10, a small eddy current is generated, which can cause the mineral particles to flip, thereby realizing the function of stirring the mineral particles and further increasing the probability of the magnetic mineral particles being adsorbed on the outer wall of the cylinder 1.

[0047] Then start the motor 12 to drive the cylinder 1 to rotate, and the slurry in the mixing tank 7 enters the feed tank 51 of the magnetic separation device 1000 and the magnetic separation device 2 1001 respectively, and flows along the sorting tank 52, the tailings tank 53, and the tailings pipe 54; in the sorting tank 52, the adsorption function of the main screen magnetic system 3 on the mineral particles is used to realize the adsorption and magnetic stirring functions of the magnetic mineral particles, and the main screening operation of the magnetic mineral particles is carried out. As the cylinder 1 rotates, the magnetic mineral particles adsorbed on the outer wall of the cylinder 1 move upward to the concentrate hopper 55, and under the action of the cleaning water sprayed from the ore unloading water pipe 56, the magnetic mineral particles are washed off the cylinder 1 and fall into the concentrate hopper 55, and are then collected to become concentrate.

[0048] During the primary screening of magnetic ore particles, the slurry continuously flowing downward from the hopper 4 replenishes the slurry flowing from the mixing trough 7 into the feed trough 51, enabling continuous magnetic particle screening by both magnetic separation device 1000 and magnetic separation device 2 1001. By pre-screening magnetic particles in the pre-screening magnetic system 301 and performing primary screening of magnetic particles in the main screening magnetic system 3, this dual screening effectively improves the quality of the concentrate. Simultaneously, the rotation of the barrel shaft 21 drives the rotation of the wheel shaft 943, which in turn drives the rotation of the cams 942 of the water inlet assembly 1 94 and the water inlet assembly 2 95. When the long axis end of the cam 942 of the water inlet assembly 1 94 or the water inlet assembly 2 95 rotates from top to bottom, a suction process is generated. During the suction process, spring 946 presses cover 945 downward, causing push rod 944 to move downward, thereby driving the water push plate 921 connected to push rod 944 to move downward within the water pumping trough 92. Due to the negative pressure, water in the water storage trough 93 enters the water pumping cavity above push plate 921 through the water pumping check valve 932. When the long axis end of cam 942 of water inlet assembly 1 94 or water inlet assembly 2 95 rotates from bottom to top, a pushing process is formed. During the pushing process, the edge of cam 942 presses cover 945 upward, causing spring 946 to be compressed. As cover 945 moves upward, push rod 944 drives water push plate 921 upward, thereby pushing water above push plate 921 through water inlet check valve 911 into the water equalization cavity above water equalization trough 91. The water in the water equalization cavity is then ejected into the sorting trough 52 through the inclined water hole 501. Since the cams 942 of water inlet component 1 94 and water inlet component 2 95 are arranged in a centrally symmetrical state, when the long axis end of the cam 942 of water inlet component 1 94 rotates from top to bottom, the long axis end of the cam 942 of water inlet component 2 95 rotates from bottom to top; conversely, when the long axis end of the cam 942 of water inlet component 1 94 rotates from bottom to top, the long axis end of the cam 942 of water inlet component 2 95 rotates from top to bottom. That is to say, the suction process and the pushing process in the two water pumping grooves 92 are performed alternately. When the suction process is performed in the water pumping groove 92 corresponding to the water inlet component 1 94 and the water in the water storage groove 93 is pumped into the water pumping cavity above the corresponding water push plate 921, the pushing process is performed in the water pumping groove 92 corresponding to the water inlet component 2 95 and the water in the water pumping cavity above the corresponding water push plate 921 is discharged into the water equalization cavity through the water inlet check valve 911. Conversely, when the pushing process is performed in the water pumping groove 92 corresponding to the water inlet component 1 94, the suction process is performed in the water pumping groove 92 corresponding to the water inlet component 2 95. This ensures that water continuously enters the water equalization cavity of the water equalization groove 91 and that the water in the water equalization cavity continuously sprays into the sorting groove 52 through the inclined water hole 501, ensuring that the slurry in the sorting groove 52 does not flow back into the water equalization cavity of the water equalization groove 91 through the inclined water hole 501.

[0049] See attached Figure 9As shown, the PLC control system of the magnetic separation device of the present application includes a concentration input module, a mineral particle size module, and a control unit. The input ends of the concentration input module and the mineral particle size input module are connected to the touch screen for writing data; the output ends of the concentration input module and the mineral particle size input module are connected to the input end of the control unit, and the output end of the control unit is connected to the concentration speed regulation module, the mineral particle size speed regulation module and the linkage speed regulation module. The output ends of the concentration speed regulation module, the mineral particle size speed regulation module and the linkage speed regulation module are all connected to the cylinder speed regulation module and the axle speed regulation module. The output end of the cylinder speed regulation module is connected to the transmission, and the output shaft of the transmission is connected to the cylinder shaft 21. The output end of the axle speed regulation module is connected to the speed regulator, and the output shaft of the speed regulator is connected to the axle 943.

[0050] The above system includes three control modes, namely concentration-cylinder-axle control mode, mineral particle size-cylinder-axle control mode, and concentration-mineral particle size-cylinder-axle control mode. The specific control process is as follows:

[0051] Concentration-cylinder-axle control mode: only the slurry concentration value is written into the concentration input module, and the slurry concentration value is transmitted to the control unit. The control unit mobilizes the concentration speed control module, and the concentration speed control module mobilizes the cylinder speed control module and the axle speed control module. The cylinder speed control module adjusts the speed ratio of the transmission according to the slurry concentration value, thereby adjusting the rotation speed of the cylinder shaft 21. At the same time, the axle speed control module adjusts the speed ratio of the governor according to the slurry concentration value, thereby adjusting the rotation speed of the axle 943.

[0052] Mineral particle size-cylinder-axle control mode: only the mineral particle size value is written into the mineral particle size input module, and the mineral particle size is vertically transmitted to the control unit. The control unit mobilizes the mineral particle size speed regulation module, and the mineral particle size speed regulation module mobilizes the cylinder speed regulation module and the axle speed regulation module. The cylinder speed regulation module adjusts the speed ratio of the transmission according to the mineral particle size value, thereby adjusting the rotation speed of the cylinder shaft 21. At the same time, the axle speed regulation module adjusts the speed ratio of the speed regulator according to the mineral particle size value, thereby adjusting the rotation speed of the axle 943.

[0053] Concentration-mineral particle size-cylinder-axle control mode: the slurry concentration value is written into the concentration input module and the mineral particle size value is written into the mineral particle size input module. The slurry concentration value and the mineral particle size value are transmitted to the control unit. The control unit simultaneously mobilizes the linkage speed regulation module. The linkage speed regulation module calculates the optimal value of the transmission ratio and the speed regulation ratio of the speed regulator based on the two parameters of concentration and mineral particle size, and mobilizes the cylinder speed regulation module and the axle speed regulation module to regulate the transmission and the speed regulator respectively, thereby regulating the rotation speed of the cylinder shaft 21 and the axle 943, so that the rotation speeds of the cylinder shaft 21 and the axle 943 are both regulated to the optimal value, thereby maximizing the sorting quality of magnetic mineral particles in the slurry.

[0054] The cylinder speed control module controls the speed ratio of the transmission according to the slurry concentration value, thereby adjusting the rotation speed of the cylinder shaft 21 to achieve the purpose of adjusting the rotation speed of the cylinder 1; at the same time, the wheel shaft speed control module controls the speed ratio of the speed regulator according to the slurry concentration value, thereby adjusting the rotation speed of the wheel shaft 943 to achieve the purpose of adjusting the reciprocating movement speed of the water pusher 921.

[0055] Generally speaking, when the slurry concentration is high (>40%), the rotation speed of the drum 1 needs to be reduced to prevent the slurry from sticking and affecting the separation. At the same time, the water pressure of the inclined water hole 501 should be increased to increase the impact force of the water flow and improve the fluidity of the slurry. When the mineral particle size in the slurry is large, that is, the mineral particles are coarse, the rotation speed of the drum 1 can be increased to enhance the centrifugal force to separate weak magnetic impurities. At the same time, the water pressure of the inclined water hole 501 should be increased to increase the impact force of the water flow and enhance the separation effect of magnetic particles and non-magnetic particles. When the mineral particle size in the slurry is small, the rotation speed of the drum 1 needs to be reduced to avoid the mixing of non-magnetic particles caused by excessive centrifugal force. At the same time, the water pressure of the inclined water hole 501 should be reduced to reduce the impact force of the water flow and prevent magnetic particles from falling off the surface of the drum 1. The rotational speed of the drum 1 and the rotational speed of the axle 943 are associated with the slurry concentration and the mineral particle size in the slurry. The correlation between the above parameters is obtained through experiments, and the correlation between the slurry concentration and the rotational speed of the drum 1 and the rotational speed of the axle 943 is stored in the concentration speed regulation module; the correlation between the mineral particle size and the rotational speed of the drum 1 and the rotational speed of the axle 943 is stored in the mineral particle size speed regulation module, and the correlation between the slurry concentration, mineral particle size and the rotational speed of the drum 1 and the rotational speed of the axle 943 is stored in the linkage speed regulation module.

[0056] Based on the structure of the jet mechanism 9 in the above-mentioned magnetic separation device and the structure of the PLC control system of the magnetic separation device, the present application collects the slurry that has been screened and filtered through the water storage hole 931 at the outlet of the sorting tank 52 and re-sprays it into the sorting tank 52, rather than using an external water pump to pump clean water into the sorting tank 52. On the one hand, the rotation of the wheel shaft 943 is correlated with the rotation of the cylinder 1, and a single connected water pump cannot be well correlated and adjusted with the rotation of the cylinder 1; on the other hand, the concentration of the slurry affects the screening effect of the magnetic particles in the sorting tank 52. Therefore, using the slurry at the outlet of the sorting tank 52 can minimize the impact on the concentration of the slurry in the sorting tank 52, thereby improving the screening effect of the magnetic particles in the slurry.

Claims

1. A dual-machine semi-countercurrent magnetic separation device, characterized in that: The invention comprises a magnetic separation device 1 (1000) and a magnetic separation device 2 (1001) having the same structure and being symmetrically installed. The magnetic separation device 1 (1000) and the magnetic separation device 2 (1001) both comprise a box trough (100), a cylinder (1) being rotatably installed in the box trough (100), a separation plate (5) being provided below the cylinder (1), an inclined water hole (501) being provided on the separation plate (5) and being inclined toward the rotating side of the cylinder (1), a cross-sectional centerline of the inclined water hole (501) being tangent to the outer wall of the cylinder (1), a material box (4) being provided above the cylinder (1), a pre-screening magnetic system (301) being provided inside the cylinder (1), a mixing trough (7) being commonly connected to the adjacent sides of the two box troughs (100), and a jet mechanism (9) being provided in the box trough (100) for pumping water toward the inclined water hole (501); A flushing water pipe (41) is installed above the two material boxes (4), and the outlet ends of the two material boxes (4) on the side close to each other are connected to the discharge pipe (42). A top cover (43) located between the two material boxes (4) is installed at the top of the tank (100). The top cover (43) is arc-shaped and is located above the discharge pipe (42). A flushing pipe (44) is provided below both ends of the top cover (43). A spray gap is formed between the discharge pipe (42) and the top cover (43). A water spray port facing the spray gap is provided on the flushing pipe (44). Protrusions (10) are evenly provided on the outer wall of the cylinder (1).

2. The dual-machine semi-countercurrent magnetic separation device according to claim 1 is characterized in that: The jet mechanism (9) includes a water trough (91), a water extraction trough (92), a water storage trough (93), a water inlet component 1 (94) and a water inlet component 2 (95). The water trough (91) is arranged below the sorting plate (5). A water inlet check valve (911) is installed on the water trough (91). A water extraction trough (92) is arranged on each side below the water trough (91). A water push plate (921) is slidably connected to the interior of each water extraction trough (92). The water storage trough (93) is arranged on the outer wall of the sorting plate (5) and the water extraction trough (92) and is located at the outlet end of the sorting trough (52). The top wall of the water storage trough (93) is smooth and arc-shaped and is aligned with the sorting plate (52). The surfaces of the selection plate (5) are tangent to each other, a water storage hole (931) is provided on the top wall of the water storage tank (93), a water pumping check valve (932) is installed on the inner wall of the water pumping tank (92), an inlet end of the water pumping check valve (932) is located at the bottom of the inner cavity of the water storage tank (93), and an outlet end of the water pumping check valve (932) is located at the top of the inner cavity of the water pumping tank (92), and a water inlet component (94) and a water inlet component (95) are respectively provided at the bottom ends of the two water push plates (921), and the water inlet component (94) and the water inlet component (95) are respectively used to push the respectively connected water push plates (921) to move up and down in the corresponding water pumping tank (92).

3. The dual-machine semi-countercurrent magnetic separation device according to claim 2 is characterized in that: The water inlet assembly (94) includes an outer cover (941), a cam (942), a wheel shaft (943), a push rod (944), a cover (945), and a spring (946). The outer cover (941) is arranged below the water pumping trough (92). The cam (942) is located in the outer cover (941). The wheel shaft (943) is connected to the shaft hole of the cam (942). The push rod (944) is connected to the bottom wall of the water pushing plate (921). The bottom end of the push rod (944) is connected to the cover (945). 5), the cover (945) is in the shape of a bowl with its opening facing upward, the outer wall of the cover (945) contacts the outer wall of the cam (942), the outer periphery of the push rod (944) is sleeved with a spring (946), and the two ends of the spring (946) are respectively pressed on the outer wall of the water pumping trough (92) and the inner wall of the cover (945), and the cam (942) in the water inlet component (95) and the cam (942) in the water inlet component (94) are arranged in a centrally symmetrical state and share a common wheel shaft (943).

4. The dual-machine semi-countercurrent magnetic separation device according to claim 1, characterized in that: The connecting points on both sides of the mixing tank (7) are provided with flow control gates (8), one end of the flow control gate (8) is connected to a plate shaft (81), the other end of the flow control gate (8) is rotated and sealed to the box tank (100) through a shaft, the plate shaft (81) is rotated and sealed to the box tank (100), the end of the plate shaft (81) is sleeved with a gear (82), and a seat box (84) mounted on the frame (11) is provided below the gear (82), and the inner sliding connection of the seat box (84) is provided. A rack (83) is connected, and a gear (82) is engaged with the rack (83). An electric telescopic rod (85) is installed inside the seat box (84), and a driving end of the electric telescopic rod (85) is fixedly connected to the end of the rack (83). The gears (82) of the magnetic separation device 1 (1000) and the magnetic separation device 2 (1001) are engaged with the same rack (83). The outer periphery of the plate shaft (81) is sleeved with a shaft seat (86), and the shaft seat (86) is installed on the outer wall of the seat box (84).

5. The dual-machine semi-countercurrent magnetic separation device according to claim 1 is characterized in that: The middle part of the cylinder (1) is rotatably sleeved with a magnetic system shaft (2). The two magnetic system shafts (2) are both equipped with a main screening magnetic system (3) and a pre-screening magnetic system (301). The main screening magnetic system (3) and the pre-screening magnetic system (301) are both composed of a plurality of alternating magnetic poles. The pre-screening magnetic system (301) is located inside the cylinder (1) near the outlet end of the material box (4). The two ends of the cylinder (1) are respectively connected to an end cover 1 (101) and an end cover 2 (102). The magnetic system shaft ( 2) passes through the end cover one (101) and is connected to the adjustment arm (13), the magnetic system shaft (2) is rotatably connected to the end cover one (101), one end of the magnetic system shaft (2) located in the cylinder (1) is rotatably sleeved with a cylinder shaft (21), the cylinder shaft (21) passes through the end cover two (102) and is fixedly connected to the end cover two (102), the cylinder shaft (21) is connected to the rotating shaft of the motor (12) through a transmission, and the motor (12) is installed on the frame (11).

6. The dual-machine semi-countercurrent magnetic separation device according to claim 1, characterized in that: The box trough (100) is provided with a feed trough (51), a sorting trough (52), a tailings trough (53) and a tailings pipe (54) which are connected in sequence. The feed trough (51) is connected to the mixing trough (7). The box trough (100) is provided with a concentrate hopper (55) located on the side of the cylinder (1). A ore unloading water pipe (56) is installed above the concentrate hopper (55). An arc-shaped scraping arc plate (6) is provided at the top of the outer trough wall of the tailings trough (53). The scraping arc plate (6) is tangent to the arc-shaped outer trough wall of the sorting plate (5). A mineral particle gap is formed between the scraping arc plate (6) and the cylinder (1). The width of the mineral particle gap is between one-third and one-half of the width of the sorting trough (52).

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