Improved magnetic system of reciprocating series tank superconducting magnetic separator

Abstract

The present invention discloses an improved magnetic system of a reciprocating series tank type superconducting magnetic separator, wherein the magnetic separator comprises two subsystems, namely a magnetic system and a separation structure subsystem, which cooperate with each other. The magnetic system comprises a low temperature thermostat (2), wherein the low temperature thermostat (2) is provided with a high magnetic conductivity material (3) on its outer cover, wherein a superconducting winding (1) is provided inside the low temperature thermostat (2), wherein the magnetic field generated in the cylindrical space symmetrical on both sides of the central cross section of the inner aperture of the low temperature thermostat (2) is the main magnetic field, and the magnetic field generated in the space outside the high magnetic conductivity material (3) is the leakage magnetic field, wherein the transition region of the magnetic field is between the main magnetic field and the leakage magnetic field, and a reverse winding (7) is provided in the transition region of the magnetic field between the main magnetic field and the leakage magnetic field. The present invention has an ingenious structure, improves the cleaning effect of the magnetic medium, improves the production efficiency of the device, and prolongs the service life of the magnetic medium.

Description

Technical Field

[0001] The invention relates to a magnetic system structure of a magnetic separation device, in particular to an improved magnetic system of a reciprocating series tank type superconducting magnetic separator. Background Art

[0002] The reciprocating series tank type high gradient superconducting magnetic separation system was first produced as an industrial product by Carpco, a British company. The company obtained the British invention patent for this technology in 1981 (patent number: 1599824), and then obtained the US invention patent for this technology in 1999 (patent number: 5868257). A high gradient magnetic separator is a magnetic separation device that uses a magnetized magnetic medium in a magnetic field to capture magnetic particles. Due to the use of superconducting windings, the magnetic field space and magnetic field strength of this magnetic separation system surpass other types of high gradient magnetic separators, so that the separation of weak magnetic minerals can meet the requirements of both output and quality at the same time, and is an ideal equipment for improving resource utilization efficiency and resource utilization quality. After 2010, in addition to the original kaolin purification industrial application, the application scope of this magnetic separation system has been expanded to the fields of feldspar and bauxite purification, and with the continuous improvement of technology, its application scope has a trend of continuing to expand. Matching the large-caliber strong magnetic field is the reciprocating series tank type separation tank structure of the magnetic separation system. It consists of two independent sorting chambers. The inside of the sorting chamber is filled with magnetic concentrators to capture weak magnetic particles in the ore pulp at a certain filling rate. Three dummy chambers are alternately discharged between the sorting chambers to balance the magnetic force on the whole sorting tank. When one of the sorting chambers captures magnetic particles in a strong magnetic field, high-pressure water is passed into the space outside the strong magnetic field of the other sorting chamber to remove the magnetic particles on the magnetic concentrators to prepare for the capture in the next sorting cycle. This cycle is repeated to achieve continuous production. In order to make the cleaning position of the sorting chamber as close to the capture position as possible, that is, to ensure that the magnetic field strength at the cleaning position is small enough while ensuring a strong magnetic field at the capture position, the magnetic system of the above-mentioned magnetic separation system uses heavy high-permeability materials to surround the superconducting winding. Even so, in the existing reciprocating series tank high-gradient superconducting magnetic separator products, the leakage magnetic field at the cleaning position still reaches 50Gs. In actual use, we found that for most weakly magnetic minerals, the effect of cleaning the sorting chamber near the 50Gs line is not ideal, for example, the pressure of the cleaning water is high, the life of the magnetic concentrator is short, and so on. If the cleaning position of the sorting chamber is placed farther away and the leakage magnetic field is less than 5Gs, the cleaning will become easier and cleaner. However, this will reduce the capture time ratio in the sorting work cycle, thereby reducing the production efficiency of the whole machine. Summary of the invention

[0003] The present invention aims to solve the problem that the cleaning position and cleaning effect of the existing reciprocating series tank type high gradient superconducting magnetic separation system are in conflict, and further proposes an improved magnetic system of a reciprocating series tank type superconducting magnetic separator. The improved magnetic system of the reciprocating series tank type superconducting magnetic separator increases the inner diameter of the high magnetic permeability magnetic shielding material at both ends of the superconducting winding and embeds two reversely energized normal conductive windings, thereby minimizing the leakage magnetic field at the 50Gs line position at both ends of the original magnetic separation system.

[0004] The present invention is achieved through the following technical solutions:

[0005] An improved magnetic system of a reciprocating series tank superconducting magnetic separator, the magnetic separator comprises two subsystems, a magnetic system and a separation structure subsystem, which cooperate with each other. The magnetic system comprises a cryostat 2, the cryostat 2 is provided with a high magnetic permeability material 3 on the outer cover, a superconducting winding 1 is provided in the cryostat 2, the magnetic field generated in the cylindrical space symmetrical on both sides of the central cross section of the aperture in the cryostat 2 is the main magnetic field, the magnetic field generated in the space outside the high magnetic permeability material 3 is the leakage magnetic field, the transition region of the magnetic field between the main magnetic field and the leakage magnetic field is the transition region of the magnetic field, and a reverse winding 7 is provided in the magnetic field transition region between the main magnetic field and the leakage magnetic field. The reverse winding 7 is wound by conventional wires, and the direction of the current passed through the reverse winding 7 when the magnetic system is running is opposite to that of the superconducting winding 1.

[0006] Preferably, the sorting structure subsystem comprises two sorting cavities 4, three dummy cavities 5 and a sorting tank 6. The three dummy cavities 5 are alternately arranged on both sides of the two sorting cavities 4. The two sorting cavities 4 and the three dummy cavities 5 are arranged in the sorting tank 6. The feed port and the discharge port are symmetrically arranged on both sides of the sorting tank 6. The sorting cavity is filled with a magnetic medium of a certain density.

[0007] Preferably, the reverse winding 7 is symmetrically placed at both ends of the high magnetic permeability material 3, and the outer annular surface of the reverse winding 7 is tightly fixed to the inner annular surface of the two side ends of the high magnetic permeability material 3 to help the reverse winding 7 dissipate heat and restrain the electromagnetic force acting on the reverse winding 7.

[0008] Preferably, the axial length of the reverse winding 7 is the same as the thickness of the end of the high magnetic permeability material 3 , which is beneficial to reducing the thickness of the reverse winding 7 .

[0009] Preferably, the inner diameter of the reverse winding 7 is the same as the inner diameter of the cryostat 2, so that the improved magnetic system does not affect the structure and size of the sorting structure subsystem.

[0010] The improved magnetic system symmetrically installs two reverse windings 7 wound by conventional wires at the inner aperture positions at both ends of the high magnetic permeability material 3. When the magnetic system generates a strong magnetic field at the capture position of the sorting cavity 4, they shrink the 5Gs line of the leakage magnetic field to the inside of the cleaning position, and under the condition that the existing structural dimensions of the sorting tank remain unchanged, the leakage magnetic field at the cleaning position can be reduced by more than 10 times.

[0011] The beneficial effects of the present invention are:

[0012] The structure of the present invention is ingenious, which improves the cleaning effect of the magnetic concentrating medium, increases the production efficiency of the device, and prolongs the service life of the magnetic concentrating medium. In particular, it has the following advantages:

[0013] 1. Under the condition that the existing separation tank structure size remains unchanged, the leakage magnetic field at the cleaning position can be reduced by more than 10 times, improving the cleaning effect of the magnetic medium, thereby improving the production efficiency of the device and extending the service life of the magnetic medium;

[0014] 2. The magnetic field generated by the reverse energized winding has a demagnetizing effect on the magnetic field at the capture position, but the reverse winding installation position involved in the present invention makes the demagnetizing effect almost negligible, and at the same time, only a small number of ampere-turns is used to achieve the purpose of reducing the leakage magnetic field at the cleaning position;

[0015] 3. The reduction of leakage magnetic field makes it easier to clean the magnetic medium at the cleaning position, so high cleaning water pressure is no longer required. This not only reduces the power of the water pump, but also improves the inherent safety performance of the equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] For ease of explanation, the present invention is described in detail with reference to the following specific embodiments and accompanying drawings.

[0017] Figure 1 The basic structure and leakage magnetic field distribution of the existing reciprocating series tank high gradient superconducting magnetic separator magnetic separation system;

[0018] Figure 2 An improved magnetic system structure according to an embodiment of the present invention;

[0019] Figure 3 The leakage magnetic field distribution of the reciprocating series tank type superconducting magnetic separation system after improving the magnetic system according to the embodiment of the present invention. DETAILED DESCRIPTION

[0020] like Figure 2 and 3As shown, the improved magnetic system of the reciprocating series tank superconducting magnetic separator is characterized in that the magnetic separator comprises two subsystems, a magnetic system and a separation structure subsystem, which cooperate with each other. The magnetic system comprises a cryostat 2, the cryostat 2 is provided with a high magnetic permeability material 3 on the outer cover, a superconducting winding 1 is provided in the cryostat 2, the magnetic field generated in the cylindrical space symmetrical on both sides of the central cross section of the aperture in the cryostat 2 is the main magnetic field, the magnetic field generated in the space outside the high magnetic permeability material 3 is the leakage magnetic field, the transition area between the main magnetic field and the leakage magnetic field is the magnetic field, and a reverse winding 7 is provided in the magnetic field transition area between the main magnetic field and the leakage magnetic field. The reverse winding 7 is wound by conventional wires, and the direction of the current passed through the reverse winding 7 when the magnetic system is running is opposite to that of the superconducting winding 1.

[0021] The sorting structure subsystem comprises two sorting cavities 4, three dummy cavities (5) and a sorting tank (6), wherein the three dummy cavities 5 are alternately arranged on both sides of the two sorting cavities 4, the two sorting cavities 4 and the three dummy cavities 5 are arranged in the sorting tank 6, and a feed port and a discharge port are symmetrically arranged on both sides of the sorting tank 6, and the sorting cavity is filled with a magnetic concentrating medium of a certain density.

[0022] The reverse winding 7 is symmetrically placed at both ends of the high magnetic permeability material 3, and the outer ring surface of the reverse winding 7 is tightly fixed to the inner ring surface of the two side ends of the high magnetic permeability material 3 to help the reverse winding 7 dissipate heat and restrain the electromagnetic force acting on the reverse winding 7.

[0023] The axial length of the reverse winding 7 is the same as the thickness of the end of the high magnetic permeability material 3 , which is beneficial to reducing the thickness of the reverse winding 7 .

[0024] The inner diameter of the counter-winding 7 is the same as the inner diameter of the cryostat 2, so that the improved magnetic system does not affect the structure and size of the sorting structure subsystem.

[0025] Refer to the attached Figure 1The existing reciprocating series tank type high gradient superconducting magnetic separator magnetic separation system consists of two subsystems. The superconducting winding 1 in the cryostat 2 and the high magnetic permeability material 3 constitute a magnetic system. A strong magnetic field, namely the main magnetic field, is generated in the cylindrical space symmetrically on both sides of the central cross section of the aperture in the cryostat 2, and the magnetic field generated in the space outside the high magnetic permeability material 3 is called the leakage magnetic field. The transition area of ​​the magnetic field is between the main magnetic field and the leakage magnetic field. The sorting structure subsystem consists of two sorting cavities 4, three dummy cavities 5 and a sorting tank 6. The feed port and the discharge port are symmetrically arranged on both sides of the sorting tank 6. The sorting cavity is filled with a certain density of magnetic concentrating medium. When one of the sorting cavities 4 captures magnetic particles in the strong magnetic field area, the other sorting cavity 4 is cleaned with high-pressure water in the leakage magnetic field area. The three dummy cavities 5 are alternately arranged on both sides of the sorting cavity 4 to balance the total axial magnetic field force acting on the sorting tank 6. In this system, the cleaning position of the sorting cavity 4 is arranged near the 50Gs line of the leakage magnetic field. The 5Gs line usually exceeds the position that the sorting tank 6 can reach.

[0026] See attached Figure 2 and attached Figure 3 The improved magnetic system of the present invention symmetrically installs two reverse windings 7 wound by conventional wires at the inner aperture positions at both ends of the high magnetic permeability material 3. They are called reverse windings because the direction of the current passing through them when the magnetic system is running is opposite to that of the superconducting windings. When the magnetic system generates a strong magnetic field at the capture position of the sorting cavity 4, they cause the 5Gs line of the leakage magnetic field to shrink to the inside of the cleaning position.

[0027] The thickness of the reverse winding 7 should be as thin as possible to maximize the magnetic field shielding capability of the high magnetic permeability material 3, thereby allowing the use of as few ampere-turns as possible to achieve the goal of reducing the leakage magnetic field at the cleaning position and reducing the electric power consumed by the reverse winding 7; even if the reverse winding 7 is not energized, the leakage magnetic field only increases slightly compared to the magnetic system before the improvement, thereby allowing the reverse winding 7 to be energized only when the sorting chamber 4 is performing a cleaning operation.

[0028] The axial length of the reverse winding 7 is the same as the thickness of the end of the high magnetic permeability material 3 , which is beneficial to reducing the thickness of the reverse winding 7 .

[0029] The inner diameter of the counter-winding 7 is the same as the inner diameter of the cryostat 2, so that the improved magnetic system does not affect the structure and size of the sorting structure subsystem.

[0030] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that are not conceived through creative work should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope defined in the claims.

Claims

1. An improved magnetic system of a reciprocating series tank superconducting magnetic separator, the magnetic separator comprising two subsystems, a magnetic system and a separation structure subsystem, which cooperate with each other. The magnetic system comprises a cryostat (2), the cryostat (2) is provided with a high magnetic permeability material (3) on its outer cover, a superconducting winding (1) is provided inside the cryostat (2), the magnetic field generated in the cylindrical space symmetrical on both sides of the central cross section of the inner aperture of the cryostat (2) is the main magnetic field, the magnetic field generated in the space outside the high magnetic permeability material (3) is the leakage magnetic field, and the transition area between the main magnetic field and the leakage magnetic field is the magnetic field, characterized in that: A reverse winding (7) is provided in the magnetic field transition region between the main magnetic field and the leakage magnetic field. When the magnetic system is in operation, the direction of the current flowing through the reverse winding (7) is opposite to that of the superconducting winding (1).

2. The improved magnetic system of the reciprocating series tank superconducting magnetic separator according to claim 1 is characterized in that: The reverse winding (7) is symmetrically placed at the two ends of the high magnetic permeability material (3), and the outer annular surface of the reverse winding (7) is tightly fixed on the inner annular surfaces of the two side ends of the high magnetic permeability material (3).

3. The improved magnetic system of the reciprocating series tank superconducting magnetic separator according to claim 1, characterized in that: The axial length of the reverse winding (7) is the same as the thickness of the end of the high magnetic permeability material (3).

4. The improved magnetic system of the reciprocating series tank type superconducting magnetic separator according to claim 1 is characterized in that: The inner diameter of the counterwinding (7) is the same as the inner diameter of the cryostat (2).

5. The improved magnetic system of the reciprocating series tank superconducting magnetic separator according to claim 1, characterized in that: The sorting structural subsystem comprises two sorting cavities (4), three dummy cavities (5) and a sorting tank (6), wherein the three dummy cavities (5) are alternately arranged on both sides of the two sorting cavities (4), the two sorting cavities (4) and the three dummy cavities (5) are arranged in the sorting tank (6), and a feed port and a discharge port are symmetrically arranged on both sides of the sorting tank (6), and the sorting cavity (4) is filled with a magnetic concentrating medium of a certain density.

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