A double-layer magnetic separation bed

Abstract

The present invention discloses a double-layer magnetic separation bed, comprising a vibration mechanism and a magnetic separation mechanism located on a frame, wherein the magnetic separation mechanism comprises a roughing vibration magnetic separation bed and a scavenging vibration magnetic separation bed, wherein the roughing vibration magnetic separation bed is located above the scavenging vibration magnetic separation bed; the vibration mechanism comprises a vibration box, wherein eccentric excitation blocks are symmetrically arranged on the rotating shaft at the top of the vibration box, and the rotating shaft is connected to the transmission motor outside the vibration box. The roughing vibration magnetic separation bed comprises a roughing plate-type magnetic separation bed and a power connection plate, wherein the roughing plate-type magnetic separation bed is built into the vibration mechanism at the same inclination and is connected to the inner wall of the vibration box through longitudinal beams on both sides, and the power connection plate is located on one of the longitudinal beams; the scavenging vibration magnetic separation bed has the same structure as the roughing vibration magnetic separation bed. The present invention can realize continuous and multiple separation of magnetite, so as to reduce equipment and infrastructure investment and save operating and management costs on the basis of obtaining ideal product indicators.

Description

Technical Field

[0001] The invention belongs to the technical field of magnetic separation in ore dressing plants, and particularly relates to a double-layer magnetic separation bed. Background Art

[0002] Since most iron ores currently possess a certain degree of magnetism, magnetic separation is the primary method for iron ore beneficiation. Strongly magnetic minerals such as magnetite and titanomagnetite are often separated using drum magnetic separators, while weakly magnetic minerals such as hematite, limonite, and specularite are often separated using vertical and horizontal ring high-intensity magnetic separators. Magnetite, the most widely used and most abundant iron ore, is separated and recovered using weak magnetic separators with a lower magnetic field strength due to its strong magnetic properties.

[0003] Many magnetite mines currently have ore grades between 45% and 50%, representing high-magnetite content and rich ores. However, the current marketable grade of iron ore generally ranges from 58% to 65%, necessitating magnetic separation and enrichment of the magnetite to achieve the required marketable grade. However, for some ores with a grade between 45% and 50%, even a single magnetic separation often fails to meet marketable grade requirements.

[0004] At present, a single dry magnetic separator can only perform one sorting operation. In order to obtain more ideal sorting indicators, multiple devices can only be used to perform multiple sweeping or fine selection operations. This often requires excessive equipment investment, occupies a large space in the factory, has high infrastructure investment, and has high operating and maintenance costs. Summary of the Invention

[0005] The purpose of the present invention is to provide a double-layer vibrating magnetic separation bed that can realize continuous multiple separation of magnetite, so as to reduce equipment and infrastructure investment and save operating and management costs on the basis of obtaining ideal product indicators.

[0006] To achieve the above-mentioned purpose, the technical solution of the present application is: a double-layer magnetic separation bed, including a vibration mechanism and a magnetic separation mechanism located on a frame, the magnetic separation mechanism including a roughing vibration magnetic separation bed and a scavenging vibration magnetic separation bed, the roughing vibration magnetic separation bed is located above the scavenging vibration magnetic separation bed.

[0007] Furthermore, the vibration mechanism includes a vibration box, and eccentric excitation blocks are symmetrically arranged on the rotating shaft at the top of the vibration box, and the rotating shaft is connected to the transmission motor outside the vibration box.

[0008] Furthermore, the vibration box is arranged to be tilted downward from the feeding end to the discharging end, and springs are provided around the bottom of the vibration box, and the lower base of the spring is bolted to the vibration base platform.

[0009] Furthermore, the roughing vibrating magnetic separation bed includes a roughing plate magnetic separation bed and a power connection plate. The roughing plate magnetic separation bed is built into the vibration mechanism with the same inclination and is connected to the inner wall of the vibration box through longitudinal beams on both sides. The power connection plate is located on one of the longitudinal beams.

[0010] Furthermore, the conveying plate of the roughing plate magnetic separation bed is an electromagnetic plate, the magnetic field strength of the electromagnetic plate can be adjusted in the range of 100-500mT, and the magnetic field of the electromagnetic plate faces outward; each electromagnetic plate is connected in series through guide chains at both ends, and the gap between adjacent electromagnetic plates is 1.2-2.5 times the maximum particle size of the magnetite ore.

[0011] Furthermore, the transmission roller of the roughing plate type magnetic separation bed is connected to another transmission motor, which is placed outside the vibration box and bolted to a fixing frame, and the fixing frame is welded to the vibration box.

[0012] Furthermore, the roughing plate magnetic separation bed is divided into a separation section and a discharge section in the length direction from the feeding end to the discharge end. The length of the separation section is 3-8 meters, and the length of the discharge section is 1-2 meters.

[0013] Furthermore, a contact switch is provided at one end of each electromagnetic plate of the roughing plate type magnetic separation bed, and the contact switch is a spring-type contact switch; the contact switch located in the sorting section is connected to the power connection plate, and a power connection groove with a width of 5-10mm is opened in the middle of the power connection plate, and the two sides of the power connection groove are insulating rubber.

[0014] Furthermore, the scavenging vibrating magnetic separation bed has the same structure as the roughing vibrating magnetic separation bed, and the working field strength of the scavenging vibrating magnetic separation bed is 1.1-1.2 times that of the roughing vibrating magnetic separation bed; a waste rock discharge hopper is provided below the sorting section of the scavenging vibrating magnetic separation bed, and an ore discharge hopper is provided below the unloading section, and the waste rock discharge hopper and the ore discharge hopper are bolted to the vibration base platform through support ears.

[0015] As a further development, the transmission motor of the vibration mechanism, the transmission motor of the roughing vibration magnetic separation bed and the transmission motor of the scavenging vibration magnetic separation bed are all variable frequency motors, and the three variable frequency motors, the power board and the transmission roller are all connected to the control box.

[0016] By adopting the above technical solution, the present invention can achieve the following technical effects:

[0017] 1) The double-layer magnetic separation bed of the present invention places roughing and scavenging together in a vibrating box, thereby realizing the integration of two operations in one device. The device has a compact structure, reduces the number of devices and layout space, thereby saving equipment investment and plant construction costs, and reducing energy consumption and operating management costs.

[0018] 2) The coarse magnetic separation and sweeping magnetic separation of the double-layer magnetic separation bed of the present invention both adopt a vibrating bed magnetic separation method; after the material is placed on the plate-type magnetic separation bed at the feed end of the vibrating box, the magnetite is adsorbed by the magnetic force of the electromagnetic plate in the separation section; under the vibration force provided by the vibrating box, some waste rock with weaker magnetism or mixed in the adsorbed magnetite is thrown forward, and the thrown material is then further adsorbed and ejected by the subsequent electromagnetic plates. The non-magnetic waste rock is discharged from the gaps between the electromagnetic plates under the action of gravity and becomes the waste rock product of this magnetic separation section. After repeated adsorption and ejection, the concentrate is finally pulled to the unloading area by the electromagnetic plates. At this time, the electromagnetic plates are powered off, the magnetic force disappears, and the magnetic concentrate is discharged through the gaps of the return electromagnetic plates and becomes the concentrate of this magnetic separation section. The above structure realizes repeated sorting of magnetite under the magnetic force and vibration field, thereby ensuring the continuous and multiple ejection of magnetic minerals and non-magnetic rocks. Each time of separation and re-sorting, some low-grade ores with weaker magnetism and ore-gangue conjoined bodies can be discharged again, thereby achieving the goal of increasing the grade multiple times and laying a solid foundation for the high-grade final concentrate product.

[0019] 3) The roughing vibrating magnetic separation bed of the present invention improves the concentrate grade through multiple ejection and re-magnetic separation, ensuring the acquisition of high-grade concentrate. Re-scavenging the waste rock of the roughing vibrating magnetic separation bed can recover some of the magnetic ore contained in the roughing waste rock, thereby increasing the final concentrate yield and recovery rate. The roughing + scavenging vibrating magnetic separation bed can increase the recovery rate of magnetite with a grade of more than 45% to about 65%, and the recovery rate can reach more than 70%. While obtaining high-quality concentrate products, economic benefits are guaranteed.

[0020] 4) The working field strength of the scavenging process of the present invention is 1.1-1.2 times that of the roughing process. Because the field strength is higher than that of the roughing process, some ores with weaker magnetic properties that cannot be recovered by the roughing process or ores mixed in the waste rock can be recovered, thereby improving the recovery rate of the final concentrate.

[0021] 5) The length of the separation section of the present invention is 3-8 meters. The separation section is relatively long, thereby ensuring a sufficient number of repeated separations and creating conditions for obtaining excellent concentrate indicators.

[0022] 6) The power connection plate of the present invention has a power connection slot with a width of only 5-10 mm in the middle, with insulating rubber on both sides. The contact switch is a spring-loaded contact switch. That is, after the contact and the power connection plate come into contact, the spring is compressed to energize the electromagnetic plate and magnetize the electromagnetic plate. This method quickly connects and disconnects the power, eliminates the danger of contact, and ensures safety.

[0023] 7) The electromagnetic plate of the present invention can adjust the field strength between 100 and 500 mT by controlling the current supplied, thereby controlling and adjusting the magnetic attraction of the ore. The drive motor of the vibrating mechanism can be frequency-controlled to control and adjust the vibration intensity. The drive motor of the magnetic separation mechanism can also be frequency-controlled to adjust the duration of the ore in the separation section, that is, to control and adjust the separation time. This allows for the regulation and control of the magnetic and vibration forces of the separation field, ensuring the acquisition of a suitable force field. Combined with the control of the separation time, high-grade separation ore can be obtained.

[0024] 8) The transmission motors of the present invention are all variable frequency motors. The start and stop and frequency conversion signals of the three variable frequency motors, and the current intensity signals of the power board and the transmission roller are all adjusted through the control box, with a high degree of automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a top view of the internal structure of the double-layer magnetic separation bed;

[0026] Figure 2 for Figure 1 AA section view;

[0027] Figure 3 This is a schematic diagram of the connection between one of the contact switches and the power board;

[0028] Explanation of the serial numbers in the figure: 1. Frame; 2. Vibration box; 3. Eccentric excitation block; 4. Rotating shaft; 5. Transmission motor of vibration mechanism; 6. Roughing plate type magnetic separator; 7. Support lug; 8. Vibration base platform; 9. Spring; 10. Power connection plate; 11. Longitudinal beam; 12. Electromagnetic plate; 13. Guide chain; 14. Transmission roller; 15. Transmission motor of roughing plate type magnetic separator; 16. Fixed frame; 17. Ore discharge hopper; 18. Waste rock discharge hopper; 19. Scavenging vibration magnetic separator; 20. Insulating rubber; 21. Contact switch; 22. Power connection slot. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0030] Example 1

[0031] like Figure 1-3 As shown, a double-layer magnetic separation bed of the present invention includes a vibration mechanism and a magnetic separation mechanism located on a frame 1, wherein the magnetic separation mechanism includes a roughing vibration magnetic separation bed and a scavenging vibration magnetic separation bed;

[0032] The vibrating mechanism comprises a vibrating housing 2, with eccentric excitation blocks 3 symmetrically mounted on a rotating shaft 4 at the top of the housing. The rotating shaft 4 is connected to a transmission motor 5 on the outside of the housing. The housing 2 is tilted downward from the feed end to the discharge end, with springs 9 positioned around the bottom of the housing. The lower base of the springs is bolted to a vibrating base platform 8. The roughing vibrating magnetic separation bed comprises a roughing plate magnetic separation bed 6 and a power connection plate 10. The roughing plate magnetic separation bed is built into the vibrating mechanism at the same angle and connected to the inner wall of the vibrating housing via longitudinal beams 11 on both sides. The power connection plate is located on one of the longitudinal beams. The conveying plate of the roughing plate magnetic separation bed is an electromagnetic plate 12 with an adjustable magnetic field strength ranging from 100 to 500 mT. The magnetic field of the electromagnetic plate faces outward. All electromagnetic plates are connected in series via guide chains at both ends. The gap between adjacent electromagnetic plates is 1.2 to 2.5 times the maximum particle size of the magnetite ore. Together, all the roughing electromagnetic plates form the roughing separation bed surface. The transmission roller 14 of the roughing plate type magnetic separation bed is connected to another transmission motor 15, which is placed outside the vibration box and bolted to the fixing frame 16, and the fixing frame 16 is welded to the vibration box. The roughing plate type magnetic separation bed is divided into a sorting section and an unloading section in the longitudinal direction from the feeding end to the discharging end. The length of the sorting section is 3-8 meters, and the length of the unloading section is 1-2 meters. A contact switch 21 is provided at one end of each electromagnetic plate of the roughing plate type magnetic separation bed. The contact switch 21 is a spring-type contact switch. The contact switch located in the sorting section is connected to a power connection plate with a thickness of 1-3 cm. No power connection plate is provided on the longitudinal beam of the unloading section. A power connection slot 22 with a width of 5-10 mm is opened in the middle of the power connection plate 10, and insulating rubber 20 is provided on both sides of the power connection slot.

[0033] The scavenging vibrating magnetic separation bed 19 comprises a scavenging magnetic separation bed and a power connection plate, and its structure is identical to that of a roughing plate magnetic separation bed. The scavenging vibrating magnetic separation bed 19 is located 300-400 mm below the roughing vibrating magnetic separation bed. Its operating field strength is 1.1-1.2 times that of the roughing vibrating magnetic separation bed. A waste rock discharge hopper 18 is located below the separation section of the scavenging vibrating magnetic separation bed, and an ore discharge hopper 17 is located below the discharge section. The waste rock and ore discharge hoppers are bolted to the vibrating base platform via lugs 7.

[0034] The transmission motors of the vibration mechanism, the roughing vibration magnetic separation bed and the sweeping vibration magnetic separation bed are all variable frequency motors. The three variable frequency motors, the power board and the transmission roller are connected to the control box.

[0035] The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many variations and modifications are possible in light of the foregoing teachings. The exemplary embodiments have been selected and described for the purpose of explaining the specific principles of the invention and their practical application, thereby enabling those skilled in the art to realize and utilize a variety of exemplary embodiments of the invention and various options and modifications. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A double-layer magnetic separation bed, comprising a vibration mechanism and a magnetic separation mechanism located on a frame, characterized in that: The magnetic separation mechanism includes a roughing vibration magnetic separation bed and a scavenging vibration magnetic separation bed, wherein the roughing vibration magnetic separation bed is located above the scavenging vibration magnetic separation bed; The vibration mechanism includes a vibration box, and eccentric excitation blocks are symmetrically arranged on the rotating shaft at the top of the vibration box, and the rotating shaft is connected to the transmission motor outside the vibration box; The vibration box is arranged downwardly from the feeding end to the discharging end, and springs are arranged around the bottom of the vibration box. The lower base of the spring is bolted to the vibration base platform. The roughing vibrating magnetic separation bed and the scavenging vibrating magnetic separation bed both adopt a vibrating bed type magnetic separation method; after the material is placed on the plate type magnetic separation bed at the feeding end of the vibrating box, the magnetite is adsorbed by the magnetic force of the electromagnetic plate in the separation section; under the vibration force provided by the vibrating box, some waste rocks with weak magnetism or mixed in the adsorbed magnetite are thrown forward, and the thrown materials are then further adsorbed and thrown away by the subsequent electromagnetic plates, and the non-magnetic waste rocks are discharged from the gaps between the electromagnetic plates under the action of gravity to become the waste rock products of this magnetic separation section; after repeated adsorption and throwing, the concentrate is finally pulled by the electromagnetic plates to the unloading area, at which time the electromagnetic plates are powered off, the magnetic force disappears, and the magnetically separated concentrate is discharged through the gaps of the return electromagnetic plates to become the concentrate of this magnetic separation section; The roughing vibrating magnetic separation bed comprises a roughing plate-type magnetic separation bed and a power connection plate; the conveying plate of the roughing plate-type magnetic separation bed is an electromagnetic plate, the magnetic field strength of the electromagnetic plate is adjustable within a range of 100-500 mT, and the magnetic field of the electromagnetic plate faces outward; each electromagnetic plate is connected in series via guide chains at both ends, and the gap between adjacent electromagnetic plates is 1.2-2.5 times the maximum particle size of the magnetite ore; The coarse plate magnetic separator is divided into a separation section and a discharge section in the length direction from the feeding end to the discharge end. The length of the separation section is 3-8 meters, and the length of the discharge section is 1-2 meters. The scavenging vibrating magnetic separation bed has the same structure as the roughing vibrating magnetic separation bed, and the working field strength of the scavenging vibrating magnetic separation bed is 1.1-1.2 times that of the roughing vibrating magnetic separation bed. A waste rock discharge hopper is provided below the separation section of the scavenging vibrating magnetic separation bed, and an ore discharge hopper is provided below the discharge section. The waste rock discharge hopper and the ore discharge hopper are bolted to the vibration base platform through lugs. The scavenging vibrating magnetic separation bed is arranged 300-400 mm below the roughing vibrating magnetic separation bed.

2. A double-layer magnetic separation bed according to claim 1, characterized in that: The coarse plate type magnetic separation bed is built into the vibration mechanism at the same inclination and is connected to the inner wall of the vibration box through longitudinal beams on both sides, and the power connection plate is located on one of the longitudinal beams.

3. A double-layer magnetic separation bed according to claim 2, characterized in that: The transmission roller of the roughing plate type magnetic separation bed is connected to another transmission motor, which is placed outside the vibration box and bolted to a fixing frame, and the fixing frame is welded to the vibration box.

4. A double-layer magnetic separation bed according to claim 1, characterized in that: A contact switch is provided at one end of each electromagnetic plate of the roughing plate type magnetic separation bed, and the contact switch is a spring-type contact switch; the contact switch located in the sorting section is connected to the power connection plate, and a power connection groove with a width of 5-10mm is opened in the middle of the power connection plate, and both sides of the power connection groove are insulating rubber.

5. A double-layer magnetic separation bed according to claim 1, 3 or 4, characterized in that: The transmission motors of the vibration mechanism, the roughing vibration magnetic separation bed and the sweeping vibration magnetic separation bed are all variable frequency motors. The three variable frequency motors, the power board and the transmission roller are connected to the control box.

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