Flat magnetic separator

Abstract

The present invention discloses a flat magnetic separator, which comprises a frame, a conveyor belt and a magnetic force device; the magnetic force device is fixed to the frame; the conveyor belt is movably connected to the frame through belt rollers; a mineral material feeding and flushing device is arranged above the magnetic force device; the magnetic force device comprises an electromagnetic device and a corresponding magnetic concentrating plate; the electromagnetic device comprises two or more iron cores arranged in parallel and coils wound around the iron cores, and the winding directions of the coils are the same; a square iron plate is vertically fixed above the iron core, and the square iron plate is parallel to the surface of the magnetic concentrating plate; every two adjacent parallel iron cores form a group, and for each group of iron cores, the lower wire ends of the coils are connected to each other, and the upper wire ends of the windings are connected to a DC power supply; the conveyor belt is arranged between the electromagnetic device and the magnetic concentrating plate and can move in the gap between the square iron plate and the magnetic concentrating plate, the conveyor belt is arranged obliquely, and the conveyor belt is higher at the front and lower at the back in the advancing direction. The flat magnetic separator of the present invention has a large ore washing capacity, high efficiency and low energy consumption.

Description

Technical Field

[0001] The present invention relates to a beneficiation device, and particularly to a flat magnetic separator. Background Art

[0002] Magnetic separators are widely used in the beneficiation process of metal ores. There are many minerals that can be separated by magnetic separators, such as magnetite, limonite, hematite, rhodochrosite, ilmenite, wolframite, manganese ore, manganese carbonate ore, metallurgical manganese ore, manganese oxide ore, iron sand ore, kaolin, rare earth ore, etc. The magnetic separation process is realized by the action of magnetic force and mechanical force on ore particles in the magnetic field of the magnetic separator.

[0003] The flat magnetic separator is a new type of magnetic separator, which is widely used for the separation of weakly magnetic minerals with a particle size of less than 5 mm and the removal of iron from non-metallic minerals. The flat magnetic separator in the prior art is a permanent magnet type. In order to obtain a higher magnetic field strength, the magnetic system is made of high-performance rare earth neodymium iron boron material. Its characteristics are high magnetic field strength, which can reach 14,000 GS, and uniform cloth feeding, energy saving and water saving.

[0004] However, this flat magnetic separator in the prior art also has obvious defects: due to the equipment structure, high-performance rare earth neodymium iron boron material needs to be used, resulting in high cost; and it is a permanent magnet type, with an uninterrupted magnetic field and an unchanged magnetic field strength, so the efficiency is not high, the beneficiation volume is not large, the energy consumption is large, and the accuracy is not high. For example, it is difficult to achieve 2 degrees in the beneficiation accuracy of 0.15 tungsten raw ore, and the power consumption reaches 3 degrees per ton of raw ore processed.

[0005] There is an urgent need in this field for a flat magnetic separator with low cost, large ore washing volume, high efficiency, low energy consumption and high accuracy. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a flat magnetic separator with low cost, large ore washing volume, high efficiency, low energy consumption and high accuracy.

[0007] To solve the above technical problems, the flat magnetic separator of the present invention comprises a frame, a conveyor belt and a magnetic force device; the magnetic force device is fixed to the frame; the conveyor belt is movably connected to the frame through belt rollers; a mineral material feeding and flushing device is provided above the magnetic force device; the magnetic force device comprises an electromagnetic device and a corresponding magnetic concentrating plate; the electromagnetic device comprises two or more cores arranged in parallel and coils wound around the cores, and the winding directions of the coils are the same; a square iron plate is vertically fixed above the core, and the square iron plate is parallel to the surface of the magnetic concentrating plate; every two adjacent cores arranged in parallel form a group, and for each group of cores, the lower wire ends of the coil windings are connected, and the upper wire ends of the windings are connected to a DC power supply; there is a gap between the square iron plate above the core and the magnetic concentrating plate; the conveyor belt is placed between the electromagnetic device and the magnetic concentrating plate and can move in the gap between the square iron plate and the magnetic concentrating plate, the electromagnetic device is located below the conveyor belt, and the magnetic concentrating plate is located above the conveyor belt; the conveyor belt is parallel to the square iron plate and the surface of the magnetic concentrating plate; the conveyor belt is arranged obliquely, and the conveyor belt is higher at the front and lower at the back in the forward direction; the DC power supply is connected with a switching circuit.

[0008] The output voltage of the DC power supply is 60 - 120V.

[0009] The magnetic concentrating plate is an iron plate or a silicon steel sheet plate.

[0010] The silicon steel sheet plate is formed by stacking small silicon steel sheets, and the surface of the silicon steel sheet is perpendicular to the surface of the small silicon steel sheet.

[0011] In the longitudinal direction of the electromagnetic device, i.e., the forward direction of the conveyor belt, there are 5 - 6 groups of cores arranged in parallel to form a row of cores, and a corresponding row of magnetic concentrating plates is provided.

[0012] The electromagnetic device comprises 5 - 6 rows of cores arranged in parallel, and 5 - 6 rows of magnetic concentrating plates are provided correspondingly.

[0013] Adjusting devices are provided at both ends of each row of magnetic concentrating plates for adjusting the gap between the square iron plate above the core and the magnetic concentrating plate.

[0014] The adjusting device is a bolt and screw hole device, and one end of the bolt and screw hole device is fixed to the frame and the other end is fixed to the magnetic concentrating plate.

[0015] Positioning blocks are provided between the square iron plate and the magnetic concentrating plate.

[0016] The positive pole of the DC output end of the DC power supply is connected to a switching circuit, and two phases of the AC input end of the DC power supply are respectively connected to a switching circuit.

[0017] The switching circuit comprises a thyristor VT and a regulating circuit, and the regulating circuit is connected in parallel with the thyristor; the regulating circuit comprises a resistor R, a potentiometer RP and a capacitor C; the resistor, the potentiometer and the capacitor are connected in series; the gate of the thyristor is connected between the potentiometer and the capacitor of the regulating circuit.

[0018] In the thyristor of the DC output terminal switching circuit of the DC power supply, the parameters are as follows: the thyristor is 200 - 250V 250 - 400A, the resistor is 2 - 3 kΩ, the potentiometer is 40 - 50 kΩ, and the capacitor is 0.05 - 0.2 μF; preferably, the thyristor is 230V 300A, the resistor is 2.2 kΩ, the potentiometer is 47 kΩ, and the capacitor is 0.1 μF.

[0019] In the thyristor of the AC input terminal switching circuit of the DC power supply, the parameters are as follows: the thyristor is 500 - 630V 5 - 15A, the resistor is 4 - 5 kΩ, the potentiometer is 90 - 120 kΩ, and the capacitor is 0.05 - 0.2 μF; preferably, the thyristor is 630V 10A, the resistor is 4.7 kΩ, the potentiometer is 100 kΩ, and the capacitor is 0.1 μF.

[0020] With the structure of the present invention, due to the provision of a conveyor belt and a magnetic device, there is a mineral feeding and flushing device above the magnetic device. The magnetic device adopts an electromagnetic method rather than a permanent magnetic method, and includes an electromagnetic device and a corresponding magnetic concentrating plate. The electromagnetic device includes two or more juxtaposed iron cores and coils wound around the iron cores. Each adjacent pair of juxtaposed iron cores forms a group. For each group of iron cores, the lower wire ends of the coil windings are connected, and the upper wire ends of the windings are connected to a DC power supply. The conveyor belt is higher at the front and lower at the back in the forward direction. In this way, the magnetic device can generate a magnetic field. When the ore passes through the conveyor belt in the magnetic device area after flowing down through the feeding and flushing device, the soil is washed away by water and flows along, while the ore is adsorbed on the conveyor belt and moves forward with the conveyor belt and then is collected. The present invention uses electromagnetic force for ore dressing, overcomes the defects of the prior art, can be processed continuously, has a large ore dressing capacity, a high enrichment ratio, high efficiency, low energy consumption, and is also convenient to operate. The magnetic device of the present invention adopts an electromagnetic method and does not require the use of high-performance rare earth neodymium iron boron materials, thus reducing costs. Through tests, the power consumption for processing 1 ton of raw ore is only 1.3 degrees.

[0021] The electromagnetic device of the present invention in the longitudinal direction, i.e., the forward direction of the conveyor belt, includes 5 - 6 groups of juxtaposed iron cores forming a row of iron cores, and a corresponding row of magnetic concentrating plates is provided; the electromagnetic device includes 5 - 6 rows of juxtaposed iron cores, and 5 - 6 rows of magnetic concentrating plates are correspondingly provided. Adjusting devices are provided at both ends of each row of magnetic concentrating plates for adjusting the gap between the square iron plate above the iron core and the magnetic concentrating plate. In this way, a high magnetic field can be generated, which can reach 18,000 to 25,000 GS, and can effectively adsorb weakly magnetic minerals such as tungsten, with high ore dressing efficiency. Moreover, the magnetic field strength of the magnetic device can be flexibly and accurately adjusted as needed, overcoming the defects of the prior art permanent magnetic flat machines, facilitating accurate ore dressing, improving the ore dressing accuracy, and having high magnetic field stability.

[0022] The DC power supply of the present invention is connected to a switching circuit. The positive pole of the DC output terminal of the DC power supply is connected to a switching circuit, and the two phases of the AC input terminal of the DC power supply are respectively connected to a switching circuit. The switching circuit includes a thyristor VT and a control circuit, and the control circuit is connected in parallel with the thyristor. The control circuit includes a resistor R, a potentiometer RP, and a capacitor C, and the resistor R, the potentiometer RP, and the capacitor C are connected in series. The gate of the thyristor is connected between the potentiometer and the capacitor of the control circuit. In this way, the electromagnetic device can generate an intermittent magnetic field, continuously alternate the absorption and release of magnetic minerals, facilitate the separation of magnetic minerals, improve the beneficiation accuracy. Through experiments, the beneficiation accuracy of tungsten raw ore with 0.15 degrees can reach 3 degrees. Since the DC power supply of the present invention is connected to a switching circuit, it also avoids overheating damage caused by too long power-on time due to uninterrupted power supply, thereby extending the service life of the equipment and reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of the present invention;

[0024] Figure 2 is a schematic structural diagram of the magnetic force device of the present invention;

[0025] Figure 3 is a schematic structural diagram of the magnetic concentrating plate of the magnetic force device of the present invention;

[0026] Figure 4 is a schematic structural diagram of the DC power supply switching circuit of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0027] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments:

[0028] As Figure 1 、 Figure 2 、 Figure 3 shown, the plate-type magnetic separator of the present invention includes a frame 1, a conveyor belt 2, and a magnetic force device 3.

[0029] The magnetic force device is fixed to the frame. The conveyor belt is movably connected to the frame through belt rollers. A mineral material feeding and flushing device 4 is provided above the magnetic force device.

[0030] The magnetic force device includes an electromagnetic device and a corresponding magnetic concentrating plate 5.

[0031] The electromagnetic device includes two or more cores 7 arranged in parallel and coils wound around the cores, and the winding directions of the coils are the same. A square iron plate 6 is vertically fixed above the core, and the square iron plate is parallel to the surface of the magnetic concentrating plate. Every two adjacent parallel cores are a group, and for each group of cores, the lower wire ends of the coil windings are connected to each other, and the upper wire ends of the windings are connected to the DC power supply. The rectification circuit of the DC power supply is a prior art, the AC input voltage can be 380V, and the DC output voltage is preferably 60 - 120V.

[0032] There is a gap between the square iron plate above the iron core and the magnetic concentrating plate. The conveyor belt is placed between the electromagnetic device and the magnetic concentrating plate and can move in the gap between the square iron plate and the magnetic concentrating plate. The electromagnetic device is located below the conveyor belt, and the magnetic concentrating plate is located above the conveyor belt. The conveyor belt is parallel to the surfaces of the square iron plate and the magnetic concentrating plate.

[0033] The conveyor belt is arranged obliquely, with the front higher than the rear in the forward direction of the conveyor belt.

[0034] The magnetic concentrating plate is preferably an iron plate or a silicon steel sheet plate. It is preferably a silicon steel sheet plate, which has the best magnetic concentrating effect.

[0035] The silicon steel sheet plate is formed by stacking small silicon steel sheets 8, and the surface of the silicon steel sheet is perpendicular to the surface of the small silicon steel sheet. The stacking method of the small silicon steel sheets is prior art.

[0036] The electromagnetic device preferably includes 5 - 6 groups of parallel iron cores arranged longitudinally, i.e., in the forward direction of the conveyor belt, to form a row of iron cores, and a row of magnetic concentrating plates is correspondingly arranged. The electromagnetic device preferably includes 5 - 6 rows of parallel iron cores arranged, and 5 - 6 rows of magnetic concentrating plates are correspondingly arranged.

[0037] Adjusting devices are provided at both ends of each row of magnetic concentrating plates for adjusting the gap between the square iron plate above the iron core and the magnetic concentrating plate. In this way, the magnetic field intensity can be accurately adjusted, avoiding the defects of the prior art and enhancing the separation effect.

[0038] The adjusting device is preferably a bolt - nut device. One end of the bolt - nut device is fixed to the frame, and the other end is fixed to the magnetic concentrating plate.

[0039] Positioning blocks are provided between the square iron plate and the magnetic concentrating plate. In this way, contact between the square iron plate and the magnetic concentrating plate can be avoided, and their minimum distance can be limited.

[0040] The DC power supply is connected with a switching circuit.

[0041] As Figure 4 shown, preferably, the positive pole of the DC output terminal of the DC power supply is connected to a switching circuit, and the two phases of the AC input terminal of the DC power supply are respectively connected to a switching circuit.

[0042] The switching circuit includes a thyristor VT and a regulating circuit. The regulating circuit is connected in parallel with the thyristor. The regulating circuit includes a resistor R, a potentiometer RP, and a capacitor C. The resistor R, the potentiometer RP, and the capacitor C are connected in series. The gate of the thyristor is connected between the potentiometer RP and the capacitor C of the regulating circuit.

[0043] Preferably, in the switching circuit at the DC output terminal of the DC power supply, the thyristor is 200 - 250V 250 - 400A, the resistor is 2 - 3 kΩ, the potentiometer is 40 - 50 kΩ, and the capacitor is 0.05 - 0.2 μF. Preferably, the thyristor is 230V 300A, the resistor is 2.2 kΩ, the potentiometer is 47 kΩ, and the capacitor is 0.1 μF.

[0044] In the thyristor of the AC input terminal switching circuit of the DC power supply, the thyristor is 500 - 630V 5 - 15A, the resistor is 4 - 5 kΩ, the potentiometer is 90 - 120 kΩ, and the capacitor is 0.05 - 0.2 μF. Preferably, the thyristor is 630V 10A, the resistor is 4.7 kΩ, the potentiometer is 100 kΩ, and the capacitor is 0.1 μF.

Claims

1. A flat magnetic separator, characterized in that: It includes a frame (1), a conveyor belt (2) and a magnetic device (3); the magnetic device is fixed to the frame; the conveyor belt is movably connected to the frame through belt rollers; a mineral material feeding and flushing device (4) is arranged above the magnetic device; the magnetic device includes an electromagnetic device and a corresponding magnetic concentrating plate (5); the electromagnetic device includes two or more cores (7) arranged in parallel and coils wound around the cores, and the winding directions of the coils are the same; a square iron plate (6) is vertically fixed above the core, and the square iron plate is parallel to the surface of the magnetic concentrating plate; every two adjacent cores arranged in parallel form a group, and for each group of cores, the lower wire ends of the coil windings are connected, and the upper wire ends of the windings are connected to a DC power supply; there is a gap between the square iron plate above the core and the magnetic concentrating plate; the conveyor belt is placed between the electromagnetic device and the magnetic concentrating plate and can move in the gap between the square iron plate and the magnetic concentrating plate, the electromagnetic device is located below the conveyor belt, and the magnetic concentrating plate is located above the conveyor belt; the conveyor belt is parallel to the square iron plate and the surface of the magnetic concentrating plate; the conveyor belt is arranged obliquely, with the front end higher than the rear end in the advancing direction of the conveyor belt; the DC power supply is connected with a switching circuit; The positive pole of the DC output terminal of the DC power supply is connected to a switching circuit, and the two phases of the AC input terminal of the DC power supply are respectively connected to a switching circuit; The switching circuit includes a thyristor VT and a regulating circuit, and the regulating circuit is connected in parallel with the thyristor; the regulating circuit includes a resistor R, a potentiometer RP and a capacitor C; the resistor, the potentiometer and the capacitor are connected in series; the gate of the thyristor is connected between the potentiometer and the capacitor of the regulating circuit; In the longitudinal direction of the electromagnetic device, i.e., the advancing direction of the conveyor belt, there are 5 - 6 groups of cores arranged in parallel to form a row of cores, and a corresponding row of magnetic concentrating plates is arranged; the electromagnetic device includes 5 - 6 rows of cores arranged in parallel, and 5 - 6 rows of magnetic concentrating plates are correspondingly arranged.

2. The plate magnetic separator according to claim 1, wherein: The output voltage of the DC power supply is 60 - 120V.

3. The flat magnetic separator according to claim 1, wherein: The magnetic concentrating plate is an iron plate or a silicon steel sheet plate.

4. The plate magnetic separator according to claim 3, characterized in that: The silicon steel sheet plate is stacked by small silicon steel sheets (8), and the surface of the silicon steel sheet is perpendicular to the surface of the small silicon steel sheet.

5. The plate magnetic separator according to claim 1, characterized in that: Adjusting devices are arranged at both ends of each row of magnetic concentrating plates for adjusting the gap between the square iron plate above the core and the magnetic concentrating plate.

6. The flat magnetic separator according to claim 5, wherein: The adjusting device is a bolt and screw hole device, one end of the bolt and screw hole device is fixed to the frame, and the other end is fixed to the magnetic concentrating plate.

7. The flat magnetic separator according to claim 1, characterized in that: A positioning block is arranged between the square iron plate and the magnetic concentrating plate.

8. The plate magnetic separator according to claim 1, characterized in that: In the switching circuit at the DC output terminal of the DC power supply, the thyristor is 200 - 250V / 250 - 400A, the resistor is 2 - 3kΩ, the potentiometer is 40 - 50kΩ, and the capacitor is 0.05 - 0.2μF.

9. The flat magnetic separator according to claim 8, wherein: In the switching circuit at the DC output terminal of the DC power supply, the thyristor is 230V / 300A, the resistor is 2.2kΩ, the potentiometer is 47kΩ, and the capacitor is 0.1μF.

10. The flat magnetic separator according to claim 1, characterized in that: In the switching circuit at the AC input terminal of the DC power supply, the thyristor is 500 - 630V / 5 - 15A, the resistor is 4 - 5kΩ, the potentiometer is 90 - 120kΩ, and the capacitor is 0.05 - 0.2μF.

11. The flat magnetic separator according to claim 10, characterized in that: In the switching circuit at the AC input terminal of the DC power supply, the thyristor is 630V / 10A, the resistor is 4.7kΩ, the potentiometer is 100kΩ, and the capacitor is 0.1μF.

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