Electric separator for magnetic grading of ore sand

Abstract

The electric separator comprises a rack, a feeding groove is formed in the top of the rack, a primary separation module is arranged below the feeding groove, the primary separation module comprises a discharging groove, a primary separation arc plate is arranged above the discharging groove, the primary separation arc plate is electrically connected with an external power source, and the primary separation arc plate is electrically connected with the external power source. A first adjusting assembly is arranged on the primary separation arc plate, the discharging groove comprises a concentrate groove, a middling groove and a tailing groove, a re-separation module is arranged below the middling groove, the re-separation module comprises a throwing device, the output end of the throwing device is connected with the concentrate groove and the tailing groove, a re-separation arc plate is arranged below the throwing device, and a second adjusting assembly is arranged below the re-separation arc plate. The re-selection arc plate is electrically connected with an external power source, and a second adjusting assembly is arranged on the re-selection arc plate. The problem that in the prior art, an arc plate type electric separator is difficult to treat middlings in single operation is solved.

Description

Technical Field

[0001] This invention relates to the field of mineral processing technology, and in particular to an electrostatic separator for magnetic classification of minerals. Background Technology

[0002] Electrostatic separation is the most effective method for improving the grade of ilmenite concentrate and reducing harmful impurities such as oxide and phosphorus-containing minerals. In mineral separation, electrostatic separators are generally used to separate minerals based on differences in their electrical properties. Roller electrostatic separators are commonly used for screening operations, but multiple screenings require multiple separators, resulting in large space requirements and the need for corresponding transport devices to move materials from one separator to the next, leading to high equipment costs and energy consumption. In response, Chinese Utility Model Patent Publication No. CN220900679U discloses an arc-plate electrostatic screening machine. This machine utilizes gravity to cause materials to fall within the machine and undergo multiple screenings, effectively removing impurities from mineral powder to obtain qualified mineral powder. It features a compact structure and excellent screening effect.

[0003] In electrostatic precipitator (ESP) screening operations, in addition to producing conductor concentrate and non-conductor tailings, middlings are also generated. Middlings are generally caused by excessive intermediate impurities or by the agglomeration of mineral powder. The existing technologies do not effectively treat middlings, resulting in them being discharged as the final product, classified as tailings, thus reducing resource recovery rates. Treating middlings requires repeatedly backfilling them into the ESP for screening, leading to reduced production efficiency and increased production costs. Summary of the Invention

[0004] The purpose of this invention is to solve the problem that existing arc plate electrostatic separators are unable to process middlings in a single operation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An electrostatic separator for magnetic classification of mineral sands includes a frame, a feed chute at the top of the frame, a primary separation module below the feed chute, a discharge chute, a primary separation arc plate above the discharge chute, the primary separation arc plate being electrically connected to an external power source, a first adjustment component on the primary separation arc plate, the discharge chute including a concentrate chute, a middlings chute, and a tailings chute, a re-selection module below the middlings chute, the re-selection module including a throwing device, the output end of the throwing device being connected to the concentrate chute and the tailings chute respectively, a re-selection arc plate below the throwing device, the re-selection arc plate being electrically connected to an external power source, and a second adjustment component on the re-selection arc plate.

[0007] Preferably, the throwing device includes a throwing plate and a transfer plate. The input end of the transfer plate is connected to the output end of the intermediate ore bin. The transfer plate is located above the throwing plate. The cross-section of the throwing plate is an S-shaped curve. The throwing plate is located above the reselection arc plate.

[0008] Preferably, the first adjustment component includes a first coil, which is electrically connected to an external power source. A first insulating sleeve is provided outside the first coil. A plurality of first connecting rods are provided on the first insulating sleeve. The first connecting rods slide relative to the first insulating sleeve. The first connecting rods are magnetically connected to the first coil and connected to the initial selection arc plate. A first sealing sleeve is provided between the first insulating sleeve and the first connecting rods. A heat dissipation device is provided on the first insulating sleeve. The output end of the heat dissipation device is connected to the feed trough. A braking device is sleeved on the first connecting rods.

[0009] Preferably, the braking device includes a brake and a spring, the brake being sleeved on the first insulating sleeve, and the spring being sleeved on the first connecting rod and the insulating sleeve.

[0010] Preferably, the second adjustment component includes a second coil, which is electrically connected to an external power source. A second isolation sleeve is provided outside the second coil. A plurality of second connecting rods are provided on the second isolation sleeve. The second connecting rods slide relative to the second isolation sleeve. The second connecting rods are magnetically connected to the second coil and connected to the reselection arc plate. A second sealing sleeve is provided between the second isolation sleeve and the second connecting rods. The second isolation sleeve is connected to the heat dissipation device. The brake is also sleeved on the second isolation sleeve. The spring is also sleeved on the second connecting rod.

[0011] Preferably, the heat dissipation device includes a heat dissipation pipe and a heat dissipation fan. The heat dissipation fan is arranged above the first coil and the second coil. The output end of the heat dissipation fan is connected to the input end of the heat dissipation pipe, and the output end of the heat dissipation pipe is connected to the feed trough.

[0012] Preferably, a heating tube is sleeved on the outside of the feed trough, and the input end of the heating tube is connected to the output end of the heat dissipation pipe.

[0013] Preferably, both the first isolation sleeve and the second isolation sleeve are provided with a third connecting rod, and the third connecting rod is hinged to the initial selection arc plate and the reselection arc plate. The brake is also sleeved on the third connecting rod.

[0014] The beneficial effects proposed by this invention are as follows:

[0015] An electrostatic separator for magnetic classification of mineral sands is a multi-layer arc plate electrostatic separator. Mineral powder enters the primary separation module through the feed trough. The primary separation module is powered on and started. When the mineral powder flows out of the feed trough, conductive mineral particles in the powder are attracted by the electrodes emitted by the primary separation arc plate. At this time, the falling trajectory of the conductive mineral particles is deflected, and they fall into the concentrate trough for collection. Non-conductive mineral particles fall into the tailings trough under their own weight. During this process, due to interference from non-conductive mineral particles or other non-target conductive mineral particles, the target conductive mineral particles cannot reach the required deflection angle and therefore cannot fall into the concentrate trough. A middlings trough is set at the point where their deflected trajectory lands. The middlings trough is used to collect this mixed mineral powder, hereinafter referred to as middlings. Middlings enter the re-selection module through the middlings trough. At this point, the re-selection arc plate is energized and activated. The middlings, during discharge via the throwing device, do not fall vertically but follow a parabolic trajectory. During this descent, the target conductive mineral particles are attracted by the motor generated by the re-selection arc plate. Because the re-selection arc plate is located below the throwing device, a magnetic force is applied to the target conductive mineral particles in the direction of gravity during the middlings discharge, causing them to be attracted by the re-selection arc plate and thus changing their trajectory. The target conductive mineral particles then move downwards in a near-vertical direction and fall into the concentrate trough. The remaining middlings, having detached from the target conductive mineral particles, flow into the tailings trough. This re-selection module allows for the simultaneous processing of middlings in a single mineral processing operation, increasing concentrate production, reducing middlings output, and improving the screening efficiency of the electrostatic separator. Attached Figure Description

[0016] Figure 1 This is a perspective view of an electrostatic separator for magnetic classification of mineral sands proposed in this invention.

[0017] Figure 2 This is a partial enlarged view A in a perspective view of an electrostatic separator for magnetic classification of mineral sands proposed in this invention;

[0018] Figure 3 This is a partial enlarged view B in a perspective view of an electrostatic separator for magnetic classification of mineral sands proposed in this invention;

[0019] Figure 4 This is a schematic diagram showing the series connection between the primary separation modules of an electrostatic separator for magnetic grading of mineral sands proposed in this invention.

[0020] Figure 5 This is a schematic diagram showing the connection between the primary separation module and the secondary separation module of an electrostatic separator for magnetic classification of mineral sands proposed in this invention.

[0021] Figure 6 This is a schematic diagram showing the connection between the re-selection module and the discharge port of the electrostatic separator for magnetic grading of mineral sands proposed in this invention.

[0022] Figure 7 This is a structural diagram of the first adjustment component of an electrostatic separator for magnetic classification of mineral sands proposed in this invention.

[0023] Figure 8 This is a structural diagram of the second adjustment component of an electrostatic separator for magnetic classification of mineral sands proposed in this invention.

[0024] In the diagram: 1. Frame; 2. Feed chute; 3. Preliminary selection arc plate; 4. Concentrate trough; 5. Mid-minerals trough; 6. Tailings trough; 8. Re-selection arc plate; 9. Throwing plate; 10. Transfer plate; 11. First coil; 12. First isolation sleeve; 13. First connecting rod; 14. Brake; 15. Spring; 16. Sealing sleeve; 17. Second coil; 18. Second isolation sleeve; 19. Second connecting rod; 20. Heat dissipation pipe; 21. Heat dissipation fan; 22. Heating tube; 23. Third connecting rod; 24. Guide block; 25. Baffle plate; 26. First discharge port; 27. Second discharge port; 28. Discharge guide chute. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0026] Reference Figures 1 to 8An electrostatic separator for magnetic classification of mineral sands includes a frame 1. A feed chute 2 is located at the top of the frame 1. A primary separation module is located below the feed chute 2. The primary separation module includes a discharge chute. A primary separation arc plate 3 is located above the discharge chute and is electrically connected to an external power source. A first adjustment component is located on the primary separation arc plate 3. The discharge chute includes a concentrate chute 4, a middlings chute 5, and a tailings chute 6. A re-separation module is located below the middlings chute 5. The re-separation module includes a throwing device. The output end of the throwing device is connected to the concentrate chute 4 and the tailings chute 6, respectively. A re-separation arc plate 8 is located below the throwing device and is electrically connected to an external power source. A second adjustment component is located on the re-separation arc plate 8. Specifically, an electrostatic separator for magnetic classification of mineral sands is a multi-layer arc plate electrostatic separator. Mineral powder enters the primary separation module through the feed trough 2. The primary separation module is powered on and started. When the mineral powder flows out of the feed trough 2, conductive mineral particles in the powder are attracted by the electrodes emitted by the primary separation arc plate 3. At this time, the falling trajectory of the conductive mineral particles deviates, and they fall into the concentrate trough 4 for collection. Non-conductive mineral particles fall into the tailings trough 6 under their own weight. During this process, due to interference from non-conductive mineral particles or other non-target conductive mineral particles, the target conductive mineral particles cannot reach the required deflection angle and therefore cannot fall into the concentrate trough 4. A middlings trough 5 is set at the point where their deflected trajectory lands. The middlings trough 5 is used to collect this mixed mineral powder, hereinafter referred to as middlings. Middlings enter the re-selection module through the middlings trough 5. At this time, the re-selection arc plate 8 is energized and activated. The middlings, during discharge via the throwing device, do not fall vertically but follow a parabolic trajectory. During this descent, the target conductive mineral particles are attracted by the motor generated by the re-selection arc plate 8. Since the re-selection arc plate 8 is located below the throwing device, a magnetic force is applied to the target conductive mineral particles in the direction of gravity during the middlings discharge, causing them to be attracted by the re-selection arc plate 8 and thus changing their trajectory. The target conductive mineral particles then move downwards in a near-vertical direction and fall into the concentrate trough 4. The remaining middlings, having detached the target conductive mineral particles, flow into the tailings trough 6. Through this re-selection module, middlings are processed simultaneously in a single mineral processing operation, increasing concentrate production, reducing middlings output, and improving the screening efficiency of the electrostatic separator.

[0027] Furthermore, the first adjustment component is used to adjust the distance between the primary selection arc plate 3 and the output end of the feed trough 2, while the second adjustment component is used to adjust the distance between the secondary selection arc plate 8 and the throwing device. Through the above adjustment of the primary selection arc plate 3 and the secondary selection arc plate 8, the electrostatic separator can be used to screen various conductive mineral particles.

[0028] It should be noted that the electrostatic separator for magnetic classification of mineral sand is a multi-layer arc plate electrostatic separator. The primary separation module can be increased in parallel and connected in series in the frame 1 according to the efficiency of the primary separation. Similarly, the secondary separation module is also several in parallel and connected in series in the frame 1. By connecting multiple primary separation modules in series, the efficiency of electrostatic screening is further improved. Similarly, the effect of several secondary separation modules connected in series is the same.

[0029] In the above process, a partition 25 is provided at the junction of the primary selection module and the secondary selection module. The partition 25 is used to separate the tailings trough 6 from the middlings trough 5 arranged in the secondary selection module, reducing the mixing of middlings and tailings during operation and minimizing the reduction in screening accuracy and efficiency. Furthermore, a guide block 24 is provided above the tailings trough 6, which facilitates the downward flow of tailings.

[0030] Furthermore, a first discharge port 26 and a second discharge port 27 are provided between the re-selection module and the frame 1. The first discharge port 26 is used to discharge tailings to the outside of the frame 1. A discharge guide channel 28 is also provided between the first discharge port 26 and the re-selection module. The discharge guide channel 28 is used to collect and guide the tailings in the middlings trough 5 in the re-selection module and the tailings trough 6 in the primary selection module, which is conducive to the discharge of tailings from the first discharge port 26. The second discharge port 27 is used to discharge concentrate to the outside of the frame 1.

[0031] Furthermore, to facilitate better connection and flow of mineral materials in the various modules mentioned above, they can be connected using hoses (not shown in the figure) or similar pipes, which can effectively reduce dust generation during the flow of mineral powder.

[0032] Specifically, the throwing device includes a throwing plate 9 and a transfer plate 10. The input end of the transfer plate 10 is connected to the output end of the intermediate ore trough 5. The transfer plate 10 is located above the throwing plate 9. The cross-section of the throwing plate 9 is an S-shaped curve, and the throwing plate 9 is located above the re-selection arc plate 8. When the intermediate ore is input from the intermediate ore trough 5 to the transfer plate 10, and then the transfer plate 10 outputs the intermediate ore onto the throwing plate 9, the intermediate ore continuously accelerates downwards due to its own gravity. Since the throwing plate 9 is an S-shaped plate, after the intermediate ore moves to the output end of the throwing plate 9, it will follow a parabolic trajectory due to the influence of gravitational acceleration and falling inertia, and be output from the throwing plate 9. The parabolic trajectory of the intermediate ore output through the throwing plate 9 facilitates the re-selection arc plate 8 in extracting the target conductor mineral particles from the intermediate ore.

[0033] Specifically, the first adjustment component includes a first coil 11, which is electrically connected to an external power source. A first insulating sleeve 12 is provided outside the first coil 11, and several first connecting rods 13 are provided on the first insulating sleeve 12. The first connecting rods 13 slide relative to the first insulating sleeve 12 and are magnetically connected to the first coil 11. The first connecting rods 13 are connected to the initial selection arc plate 3. A first sealing sleeve 16 is provided between the first insulating sleeve 12 and the first connecting rods 13. A heat dissipation device is provided on the first insulating sleeve 12, and the output end of the heat dissipation device is connected to the feed trough 2. A braking device is fitted onto the first connecting rods 13. During the operation of the first adjustment component, the first coil 11 is energized to generate a magnetic field and output magnetic force. The magnitude of the magnetic force can be controlled by adjusting the current flowing through the first coil 11. At this time, the first connecting rods 13 are attracted by the magnetic force and move towards the first insulating sleeve 12. To achieve the moving accuracy and extension adjustment function of the first connecting rods 13, the extension and retraction of the first connecting rods 13 are restricted by the braking device. In the above process, the first insulating sleeve 12 is used to prevent the magnetic field output by the first coil 11 from spreading to the initial selection arc plate 3 and causing magnetic field interference. During the movement of the first connecting rod 13, in order to reduce the interference of moving parts in a dusty environment, the first insulating sleeve 12 can be sealed by the first sealing sleeve 16 to reduce the risk of mineral powder in the frame 1 intruding into the interior of the first insulating sleeve 12, reduce the risk of mineral powder adhering to the first coil 11, causing a decrease in magnetic efficiency, and reduce the risk of the first coil 11 overheating. Regarding the overheating problem that occurs during the energization of the first coil 11, the heat dissipation device is used to reduce the heat inside the first insulating sleeve 12. At the same time, the heat dissipation device outputs the heat to the feed trough 2, which can preheat the mineral powder, improve the conductivity of the mineral powder, and further improve the efficiency of electrostatic sieving.

[0034] Specifically, the braking device includes a brake 14 and a spring 15. The brake 14 is sleeved on the first insulating sleeve 12, and the spring 15 is sleeved on the first connecting rod 13 and the insulating sleeve. The brake 14 is used to control the movement and stationary position of the first connecting rod 13. When the brake 14 is energized, it holds the first connecting rod 13 tightly, making it stationary relative to the first insulating sleeve 12. When the brake 14 is de-energized, the first connecting rod 13 can slide relative to the first insulating sleeve 12. Furthermore, to prevent the brake 14 from reacting incorrectly due to the rapid movement of the first connecting rod 13 under magnetic pull, the spring 15 is sleeved on the first connecting rod 13. When the first connecting rod 13 is attracted by the magnetic force, it contracts, and the spring 15 is in a stretched state. At this time, the spring 15 generates and stores elastic force. When the magnetic force gradually weakens, the spring 15 releases the stored elastic force, causing the first connecting rod 13 to extend outward.

[0035] The brake 14 is preferably an electromagnetic brake, which has a fast response speed and can promptly stop and hold the axial movement of the first connecting rod 13 or other shaft-like components.

[0036] Furthermore, a magnet with a single magnetic pole can be provided on the first connecting rod 13, and the magnetic pole of the first coil 11 is changed by changing the direction of the current. By utilizing the principle that like poles repel and unlike poles attract, the telescopic movement of the first connecting rod 13 can be achieved.

[0037] Specifically, the second adjustment component includes a second coil 17, which is electrically connected to an external power source. A second insulating sleeve 18 is provided outside the second coil 17. Several second connecting rods 19 are provided on the second insulating sleeve 18. The second connecting rods 19 slide relative to the second insulating sleeve 18 and are magnetically connected to the second coil 17. The second connecting rods 19 are connected to the reselection arc plate 8. A second sealing sleeve 16 is provided between the second insulating sleeve 18 and the second connecting rods 19. The second insulating sleeve 18 is connected to the heat dissipation device. The brake 14 is also fitted onto the second insulating sleeve 18, and the spring 15 is also fitted onto the second connecting rods 19. The working principle of the second adjustment component is the same as that of the first adjustment component. That is, when the brake 14 is energized, it holds the second connecting rods 19 tightly, making them stationary relative to the second insulating sleeve 18. When the brake 14 is de-energized, the second connecting rods 19 can slide relative to the second insulating sleeve 18. Furthermore, to prevent the brake 14 from malfunctioning due to a rapid movement speed of the second connecting rod 19 under magnetic pull, a spring 15 is fitted onto the second connecting rod 19. When the second connecting rod 19 is attracted by the magnetic force, it contracts, and the spring 15 is in a stretched state. At this time, the spring 15 generates and stores elastic force. When the magnetic force gradually weakens, the spring 15 releases the stored elastic force, causing the second connecting rod 19 to extend outward. The second adjustment component enables the adjustment of the reselection arc plate 8.

[0038] In the above description, both the first insulating sleeve 12 and the second insulating sleeve 18 use insulating materials capable of magnetic shielding. During the operation of the first coil 11 and the second coil 17, the penetration of the magnetic field can be reduced, thereby reducing magnetic interference to the initial selection arc plate 3 and the re-selection arc plate 8 during their operation. Conversely, it can also reduce the interference of the initial selection arc plate 3 and the re-selection arc plate 8 to the first adjustment component and the second adjustment component during their operation.

[0039] Specifically, the heat dissipation device includes a heat dissipation pipe 20 and a heat dissipation fan 21. The heat dissipation fan 21 is arranged above the first coil 11 and the second coil 17. The output end of the heat dissipation fan 21 is connected to the input end of the heat dissipation pipe 20, and the output end of the heat dissipation pipe 20 is connected to the feed trough 2. The heat dissipation fan 21 is used to extract heat from the first insulating sleeve 12 or the second insulating sleeve 18 and discharge it through the heat dissipation pipe 20. The heat acts on the feed trough 2 through the heat dissipation pipe 20, realizing internal heat dissipation of the first insulating sleeve 12 and the second insulating sleeve 18. At the same time, the residual heat is used on the feed trough 2 for preheating of the mineral powder, which helps to reduce equipment power consumption, achieve energy saving, and reduce operating costs.

[0040] Specifically, a heating tube 22 is sleeved on the outside of the feed trough 2, and the input end of the heating tube 22 is connected to the output end of the heat dissipation pipe 20. The heating tube 22 is wound around the feed trough 2, and the heat output from the heat dissipation pipe 20 enters and exits into the heating tube 22. Through the heat transfer of the heating tube 22, the heat is input into the feed trough 2 and acts on the mineral powder, thereby heating the mineral powder in the feed trough 2 and improving the conductivity of the mineral powder.

[0041] Specifically, both the first isolation sleeve 12 and the second isolation sleeve 18 are provided with a third connecting rod 23, which is hinged to the initial selection arc plate 3 and the reselection arc plate 8. The brake 14 is also sleeved on the third connecting rod 23. In the above process, the first adjustment assembly and the second adjustment assembly can only realize the linear movement adjustment of the initial selection arc plate 3 or the reselection arc plate 8, and cannot adjust the angle of the initial selection arc plate 3 or the reselection arc plate 8. Therefore, through the hinge action of the third connecting rod 23, the initial selection arc plate 3 and the reselection arc plate 8 can rotate relative to the frame 1, which helps to reduce the risk of jamming of the connected parts when the initial selection arc plate 3 and the reselection arc plate 8 rotate, and improves the operational flexibility between the parts.

[0042] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An electrostatic separator for magnetic classification of mineral sands, comprising a frame, wherein a feed chute is provided at the top of the frame, characterized in that: A preliminary selection module is provided below the feed trough. The preliminary selection module includes a discharge trough. A preliminary selection arc plate is provided above the discharge trough. The preliminary selection arc plate is electrically connected to an external power source. A first adjustment component is provided on the preliminary selection arc plate. The discharge trough includes a concentrate trough, a middlings trough, and a tailings trough. A re-selection module is provided below the middlings trough. The re-selection module includes a throwing device. The output end of the throwing device is connected to the concentrate trough and the tailings trough, respectively. A re-selection arc plate is provided below the throwing device. The re-selection arc plate is electrically connected to an external power source. A second adjustment component is provided on the re-selection arc plate.

2. The electrostatic separator for magnetic classification of mineral sands according to claim 1, characterized in that: The throwing device includes a throwing plate and a transfer plate. The input end of the transfer plate is connected to the output end of the intermediate ore bin. The transfer plate is located above the throwing plate. The cross-section of the throwing plate is an S-shaped curve. The throwing plate is located above the reselection arc plate.

3. The electrostatic separator for magnetic classification of mineral sands according to claim 2, characterized in that: The first adjustment component includes a first coil, which is electrically connected to an external power source. A first isolation sleeve is provided outside the first coil. A plurality of first connecting rods are provided on the first isolation sleeve. The first connecting rods slide relative to the first isolation sleeve. The first connecting rods are magnetically connected to the first coil. The first connecting rods are connected to the initial selection arc plate. A first sealing sleeve is provided between the first isolation sleeve and the first connecting rods. A heat dissipation device is provided on the first isolation sleeve. The output end of the heat dissipation device is connected to the feed trough. A braking device is sleeved on the first connecting rods.

4. An electrostatic separator for magnetic classification of mineral sands as described in claim 3, characterized in that: The braking device includes a brake and a spring. The brake is sleeved on the first insulating sleeve, and the spring is sleeved on the first connecting rod and the insulating sleeve.

5. An electrostatic separator for magnetic classification of mineral sands according to claim 4, characterized in that: The second adjustment component includes a second coil, which is electrically connected to an external power source. A second isolation sleeve is provided outside the second coil. A plurality of second connecting rods are provided on the second isolation sleeve. The second connecting rods slide relative to the second isolation sleeve. The second connecting rods are magnetically connected to the second coil and connected to the reselection arc plate. A second sealing sleeve is provided between the second isolation sleeve and the second connecting rods. The second isolation sleeve is connected to the heat dissipation device. The brake is also sleeved on the second isolation sleeve. The spring is also sleeved on the second connecting rod.

6. An electrostatic separator for magnetic classification of mineral sands according to claim 5, characterized in that: The heat dissipation device includes a heat dissipation pipe and a heat dissipation fan. The heat dissipation fan is arranged above the first coil and the second coil. The output end of the heat dissipation fan is connected to the input end of the heat dissipation pipe, and the output end of the heat dissipation pipe is connected to the feed trough.

7. An electrostatic separator for magnetic classification of mineral sands according to claim 6, characterized in that: A heating tube is fitted around the outside of the feed trough, and the input end of the heating tube is connected to the output end of the heat dissipation pipe.

8. An electrostatic separator for magnetic classification of mineral sands according to claim 7, characterized in that: Both the first isolation sleeve and the second isolation sleeve are provided with a third connecting rod, which is hinged to the initial selection arc plate and the re-selection arc plate. The brake is also sleeved on the third connecting rod.

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