Electromagnetic purification device for removing inclusions in liquid metal

Abstract

The invention belongs to the field of liquid metal impurity regulation and purification, and particularly relates to an electromagnetic purification device for removing inclusions in liquid metal. The electromagnetic purification device comprises a first-stage electromagnetic oscillation tube, an electromagnetic oscillation module, a second-stage electromagnetic separation tube, a filtering assembly and an electromagnetic separation module, liquid metal containing inclusions enters the first-stage electromagnetic oscillation tube and flows through the electromagnetic oscillation module, and large-size inclusions are generated, enter the second-stage electromagnetic separation tube and flow through the electromagnetic separation module; and large-size inclusions are locally separated and collected to the filtering assembly, and are discharged after being filtered. The purification device which is efficient, continuous, free of secondary pollution and suitable for channelized conveying of the liquid metal combines the electromagnetic oscillation function, the electromagnetic separation function and the trapping function, and has the advantages that non-contact separation is achieved, continuous purification can be achieved, the filter element can be replaced, and flow resistance is small.

Description

Technical Field

[0001] This application belongs to the field of liquid metal impurity control and purification, specifically relating to an electromagnetic purification device for removing inclusions from liquid metal. Background Technology

[0002] Inclusions (bubbles, dust, oxide impurities, etc.) in liquid metals (such as lead, lead-based alloys, aluminum, zinc, etc.) can affect the physical properties and composition of the liquid metal. In the field of metal smelting, these inclusions can significantly reduce the purity, strength, toughness, fatigue life, and corrosion resistance of ingots. In the field of liquid metal (lead, lead-based alloys, sodium, etc.) cooling, non-nuclear oxide impurities (such as PbO, Fe3O4) generated by pipe corrosion and self-oxidation can also affect the flow and heat transfer characteristics of the liquid metal coolant, easily leading to inclusion deposition and scaling, and even clogging of flow channels, affecting the safe operation of the test system.

[0003] Existing purification technologies, such as fluxing, static sedimentation, bubble flotation, and filtration, have drawbacks such as material contamination, introduction of additional impurities / bubbles, low efficiency of static separation, impact on flow performance, and high resistance to long-term full-flow collection. Summary of the Invention

[0004] The purpose of this application is to provide an electromagnetic purification device for removing inclusions from liquid metal, providing a purification method that is efficient and continuous in purifying inclusions from liquid metal without secondary pollution, thereby solving the problems existing in the current purification technology.

[0005] The technical solution to achieve the purpose of this application is as follows:

[0006] This application provides an electromagnetic purification device for removing inclusions from liquid metal, including a first-stage electromagnetic oscillation tube, an electromagnetic oscillation module, a second-stage electromagnetic separation tube, a filter assembly, and an electromagnetic separation module;

[0007] The Class I electromagnetic oscillation tube is inserted into the electromagnetic oscillation coil inside the electromagnetic oscillation module;

[0008] The Level II electromagnetic separation tube is inserted into the electromagnetic separation coil inside the electromagnetic separation module;

[0009] The filter assembly is inserted into the stage II electromagnetic separation tube;

[0010] Liquid metal containing inclusions enters the first-stage electromagnetic oscillation tube from the first-stage inlet, flows through the electromagnetic oscillation module, and generates large-sized inclusions that accumulate in the top slag layer.

[0011] Liquid metal containing large inclusions flows out from the stage I drain port and enters the stage II electromagnetic separation tube through the stage II inlet. It flows through the electromagnetic separation module, where the large inclusions are locally separated and collected into the filter assembly. The filtered liquid metal then flows out from the stage II drain port.

[0012] Optionally, the electromagnetic oscillation module may include an electromagnetic oscillation coil, a Class I power supply module, a Class I insulation layer, and a Class I cooling water jacket.

[0013] The Class I power supply module supplies an alternating current of 1Hz to 1000Hz to the electromagnetic oscillation coil, generating an alternating magnetic field of 0.01T to 10T.

[0014] The Class I insulation layer is in close contact with the outer wall of the Class I electromagnetic oscillation tube;

[0015] The electromagnetic oscillation module runs through the upper and lower parts of the first-stage cooling water jacket.

[0016] Optionally, the filtration assembly includes a flow divider and a filter screen;

[0017] The filter assembly is connected to the Stage II electromagnetic separator via locking pins;

[0018] The diversion baffle surrounds the lower half of the filter assembly and is cylindrical, conical, frustum-shaped, wedge-shaped, or a combination of the above.

[0019] The filter screens are distributed in an L-shape at both ends of the upper surface of the filter assembly;

[0020] Large debris is collected in the filter assembly, directed towards the pipe wall by the diversion baffle, and intercepted by the filter screen.

[0021] Optionally, the filter screen is a sintered metal element or a woven metal mesh, with a filtration accuracy of 50μm to 5mm;

[0022] The filter structure is a combination of segments with one or more filtration accuracies;

[0023] When the filter structure is a segmented combination of multiple filtration precisions, the sintered metal elements with filtration precisions of 5mm-3mm-1mm-500μm are arranged from top to bottom.

[0024] Optionally, the electromagnetic separation module is equipped with an electromagnetic separation coil, a secondary power supply module, a secondary insulation layer, and a secondary cooling water jacket;

[0025] The Level II power supply module provides the electromagnetic windings inside the electromagnetic separation coil with a three-phase AC power of 0.5Hz to 100Hz, 0.1A to 100000A, and a phase difference of 120°.

[0026] The Class II insulation layer is tightly attached to the outer wall of the Class II electromagnetic separation pipe;

[0027] The electromagnetic separation module runs through the upper and lower parts of the Level II cooling water jacket.

[0028] Optionally, the electromagnetic separation coil is encased in a silicon steel sheet.

[0029] The electromagnetic separation coil has a built-in electromagnetic winding.

[0030] The electromagnetic winding is a three-phase distributed winding with a total of 3 windings. Each winding has 2 sets of stage pairs. The phase difference of the AC current between adjacent windings is -120° and 120°, respectively, which can generate a rotating magnetic field in the Class II electromagnetic separator tube.

[0031] Optionally, the top of the Class I electromagnetic oscillation tube and the Class II electromagnetic separation tube are respectively provided with a Class I exhaust port and a Class II exhaust port, and the bottom of the tube is respectively provided with a Class I lower drain port and a Class II lower drain port.

[0032] The Class I exhaust port is equipped with an air blowing pipe I and an auxiliary instrument I on both sides; the Class II exhaust port is equipped with an air blowing pipe II and an auxiliary instrument II on both sides.

[0033] Optionally, large inclusions that accumulate in the top slag layer can be periodically blown into the second-stage electromagnetic separation tube through the air blowing pipe I.

[0034] Optionally, the top of the Class I electromagnetic oscillating tube and the Class II electromagnetic separation tube are respectively topped with top cover I and top cover II;

[0035] Below the top cover I and top cover II is a gas space, through which 99.9% argon gas, or 0.1-5 vol.% hydrogen / argon gas mixture, or 0.1-5 vol.% oxygen / argon gas mixture are blown in through the air blowing pipe I and air blowing pipe II respectively;

[0036] The liquid level in the first-stage electromagnetic oscillation tube and the second-stage electromagnetic separation tube is controlled by the pressure in the gas space.

[0037] Optionally, Auxiliary Instrument I and Auxiliary Instrument II include a level gauge, a pressure sensor, and a thermocouple;

[0038] The pressure sensor monitors the liquid level and gas pressure in the Class I electromagnetic oscillating tube and Class II electromagnetic separation tube in real time.

[0039] The beneficial technical effects of this application are as follows: The electromagnetic purification device for removing inclusions in liquid metal provided in the embodiments of this application includes a first-stage electromagnetic oscillation tube, an electromagnetic oscillation module, a second-stage electromagnetic separation tube, a filter assembly, and an electromagnetic separation module. Liquid metal containing inclusions enters the first-stage electromagnetic oscillation tube, flows through the electromagnetic oscillation module, and generates large-sized inclusions that enter the second-stage electromagnetic separation tube, flow through the electromagnetic separation module, and are partially separated and collected in the filter assembly, and then discharged after filtration. This application provides a highly efficient, continuous, and pollution-free purification device suitable for pipelined transport of liquid metal. It combines electromagnetic oscillation, electromagnetic separation, and collection functions, and features non-contact separation, continuous purification, replaceable filter elements, and low flow resistance. When liquid metal flows through the electromagnetic purification device at a certain speed, the electromagnetic oscillation module promotes the aggregation and growth of fine inclusions in the liquid metal into large particles. The electromagnetic separation module causes the inclusions to migrate directionally to the separation zone on the pipe wall and collect in the filter assembly, which can deeply purify the fine inclusions in the liquid metal. It is suitable for the fields of liquid metal cooling tests and continuous purification and smelting of liquid metal. Attached Figure Description

[0040] Figure 1 A structural diagram of an electromagnetic purification device for removing inclusions from liquid metal, provided in an embodiment of this application;

[0041] Figure 2 This is a structural diagram of a Class I electromagnetic oscillator provided in an embodiment of this application;

[0042] Figure 3 This is a structural diagram of the Class II electromagnetic separator provided in an embodiment of this application;

[0043] Figure 4 This is a top view of the electromagnetic separation coil structure provided in an embodiment of this application;

[0044] Figure 5 This is a structural diagram of the filtering component provided in an embodiment of this application;

[0045] In the diagram: 10-Level I electromagnetic oscillating tube; 11-Level I liquid inlet; 12-Level I liquid outlet; 13-Level I exhaust port; 14-Level I lower drain port; 15-Top cover I; 16-Bolt; 17-Sealing gasket; 18-Air blowing pipe I; 19-Auxiliary instrument I;

[0046] 20 - Electromagnetic oscillation module; 21 - Electromagnetic oscillation coil; 22 - Class I power supply module; 23 - Class I insulation layer; 24 - Class I cooling water jacket;

[0047] 30 - Inclusions; 31 - Large inclusions; 32 - Slag layer;

[0048] 40-Level II electromagnetic separator tube; 41-Level II liquid inlet; 42-Level II liquid outlet; 43-Level II exhaust port; 44-Level II lower drain port; 45-Top cover II; 46-Bolt; 47-Sealing gasket; 48-Air blowing pipe II; 49-Auxiliary instrument II;

[0049] 50 - Filter assembly; 51 - Diverter baffle; 52 - Filter screen; 53 - Locking pin;

[0050] 60-Electromagnetic separation module; 61-Electromagnetic separation coil; 62-Level II power supply module; 63-Level II insulation layer; 64-Level II cooling water jacket; 65-Silicon steel sheet shell; 66-Electromagnetic winding. Detailed Implementation

[0051] To enable those skilled in the art to better understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, the embodiments described below are only a part of the embodiments of this application, and not all of them. Based on the embodiments described in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0052] To address the problems of existing technologies, this application provides an electromagnetic purification device for removing inclusions from liquid metal. This device combines electromagnetic oscillation, electromagnetic separation, and collection functions, and features non-contact separation, continuous purification, replaceable filter element, and low flow resistance. When liquid metal flows through the electromagnetic purification device at a certain speed, the electromagnetic oscillation module promotes the aggregation and growth of fine inclusions in the liquid metal into large particles. The electromagnetic separation module causes the inclusions to migrate directionally to the separation zone on the pipe wall and collect in the filter assembly, thus deeply purifying the fine inclusions in the liquid metal.

[0053] Based on the above, in order to clearly and thoroughly explain the advantages of this application, the specific implementation methods of this application will be described below.

[0054] See Figure 1 The figure is a structural diagram of an electromagnetic purification device for removing inclusions in liquid metal according to an embodiment of this application. The electromagnetic purification device includes a first-stage electromagnetic oscillation tube 10, an electromagnetic oscillation module 20, a second-stage electromagnetic separation tube 40, a filter assembly 50, and an electromagnetic separation module 60.

[0055] The Class I electromagnetic oscillation tube 10 is inserted into the electromagnetic oscillation coil 21 inside the electromagnetic oscillation module 20;

[0056] The Class II electromagnetic separator tube 40 is inserted into the electromagnetic separator coil 61 inside the electromagnetic separator module 60;

[0057] The filter assembly 50 is inserted into the stage II electromagnetic separation tube 40;

[0058] In some possible implementations of the embodiments of this application, the electromagnetic oscillation module 20 is provided with an electromagnetic oscillation coil 21, a primary power supply module 22, a primary insulation layer 23, and a primary cooling water jacket 24;

[0059] The Class I power supply module 22 supplies an alternating current of 1Hz to 1000Hz to the electromagnetic oscillation coil 21, generating an alternating magnetic field of 0.01T to 10T.

[0060] The Class I insulation layer 23 is tightly attached to the outer wall of the Class I electromagnetic oscillation tube 10;

[0061] The Class I cooling water jacket 24 has an electromagnetic oscillation module 20 running through it from top to bottom.

[0062] In some possible implementations of the embodiments of this application, the filter assembly 50 includes a flow divider baffle 51 and a filter screen 52;

[0063] Filter assembly 50 is connected to stage II electromagnetic separation tube 40 via locking pin 53;

[0064] The diversion baffle 51 surrounds the lower half of the filter assembly 50 and is cylindrical, conical, frustum-shaped, wedge-shaped, or a combination of the above.

[0065] The filter screen 52 is distributed in an L-shape at both ends of the upper surface of the filter assembly 50.

[0066] It should be noted that the filter assembly 50 can be removed and replaced by disassembling the locking pin 53.

[0067] In one example, the filter screen 52 is a sintered metal element or a woven metal mesh, preferably a sintered metal element, and the filtration accuracy is 50μm to 5mm.

[0068] The filter screen 52 has a segmented combination of one or more filtration accuracies.

[0069] When the filter screen 52 is a segmented combination of various filtration precisions, the sintered metal elements with filtration precisions of 5mm-3mm-1mm-500μm are arranged from top to bottom, which can prevent the captured impurities from flowing back into the liquid metal.

[0070] In some possible implementations of the embodiments of this application, the electromagnetic separation module 60 is provided with an electromagnetic separation coil 61, a secondary power supply module 62, a secondary insulation layer 63, and a secondary cooling water jacket 64;

[0071] The Level II power supply module 62 provides the electromagnetic winding 66 inside the electromagnetic separation coil 61 with a three-phase AC power of 0.5Hz to 100Hz, 0.1A to 100000A, and a phase difference of 120°.

[0072] The Class II insulation layer 63 is tightly attached to the outer wall of the Class II electromagnetic separation tube 40;

[0073] The second-level cooling water jacket 64 has an upper and lower electromagnetic separation module 60.

[0074] It should be noted that the Class I cooling water jacket 24 and Class II cooling water jacket 64 are used to dissipate heat, while the Class I insulation layer 23 and Class II insulation layer 63 are used to prevent the liquid metal from solidifying.

[0075] In one example, the electromagnetic separation coil 61 is encased in a silicon steel sheet shell 65;

[0076] The electromagnetic separation coil 61 has a built-in electromagnetic winding 66;

[0077] The electromagnetic winding 66 is a three-phase distributed winding with a total of 3 windings. Each winding has 2 sets of stage pairs. The phase difference of the AC current between adjacent windings is -120° and 120°, respectively, which can generate a rotating magnetic field in the Class II electromagnetic separator tube 40.

[0078] It should be noted that when the liquid metal flows through the electromagnetic separation module 60, it generates an induced current and moves towards the axis under the action of the rotating magnetic field. Since the conductivity of the inclusions is much lower than that of the liquid metal, the Lorentz force they experience is much smaller. When the liquid metal moves towards the axis, the inclusions move towards the pipe wall relative to the liquid metal, achieving local separation of the inclusions. During this process, the inclusions will further collide, aggregate, and grow.

[0079] In some possible implementations of the embodiments of this application, the first-stage electromagnetic oscillation tube 10 and the second-stage electromagnetic separation tube 40 are respectively provided with a first-stage exhaust port 13 and a second-stage exhaust port 43 at the top, and a first-stage lower drain port 14 and a second-stage lower drain port 44 at the bottom.

[0080] The first-stage exhaust port 13 is provided with an air blowing pipe I18 and an auxiliary instrument I19 on both sides; the second-stage exhaust port 43 is provided with an air blowing pipe II 48 and an auxiliary instrument II 49 on both sides.

[0081] In one example, the top of the Class I electromagnetic oscillating tube 10 and the Class II electromagnetic separation tube 40 are respectively topped with a top cover I15 and a top cover II 45;

[0082] Below the top cover I15 and top cover II 45 is a gas space, through which 99.9% argon gas, or 0.1-5 vol.% hydrogen / argon gas mixture, or 0.1-5 vol.% oxygen / argon gas mixture are blown in through the gas blowing pipe I18 and gas blowing pipe II 48 respectively;

[0083] The liquid level in the first-stage electromagnetic oscillation tube 10 and the second-stage electromagnetic separation tube 40 is controlled by the pressure of the gas space.

[0084] In another example, auxiliary instrument I19 and auxiliary instrument II 49 include a level gauge, a pressure sensor, and a thermocouple;

[0085] The pressure sensor monitors the liquid level and gas pressure in the Class I electromagnetic oscillating tube 10 and Class II electromagnetic separation tube 40 in real time.

[0086] It should be noted that the pressure affects the liquid level and the flow path of the liquid metal. If the pressure is too high, the liquid level may not rise and the liquid metal may not be able to be discharged. In this case, the liquid metal needs to be vented through the first-stage vent 13 and the second-stage vent 43. If the pressure is too low, the liquid metal may overflow onto the top cover. In this case, gas needs to be forced in through the air blowing pipe I18 and the air blowing pipe II 48.

[0087] The following uses electromagnetic purification of liquid lead as an example to illustrate the method of using an electromagnetic purification device for removing inclusions from liquid metal provided in this application.

[0088] Liquid gold and lead containing impurities 30 enter the first-stage electromagnetic oscillation tube 10 from the first-stage inlet 11 and flow through the electromagnetic oscillation module 20 at a certain flow rate (0.01~1.0m / s);

[0089] The Class I power supply module 22 supplies an alternating current of 1Hz to 1000Hz to the electromagnetic oscillation coil 21, generating an alternating magnetic field of 0.01T to 10T.

[0090] The induced current in liquid lead generates Lorentz force under the action of an alternating magnetic field, resulting in periodic reciprocating motion. During this process, small inclusions collide and coalesce to generate large inclusions 31, such as large bubbles and large particles.

[0091] Because the density of liquid lead is much greater than that of inclusions (such as steel corrosion, lead oxide generated by self-oxidation, iron oxide, etc.), the large-sized inclusions 31 after growth are attracted to the top slag layer 32 by buoyancy.

[0092] Liquid lead containing large inclusions 31 flows out from the first-stage drain port 12 and enters the second-stage electromagnetic separation tube 40 through the second-stage inlet port 41, or is periodically blown into the second-stage electromagnetic separation tube 40 through the air blowing pipe I18.

[0093] Liquid lead carrying large inclusions 31 flows through electromagnetic separation module 60;

[0094] The Level II power supply module 62 provides three-phase AC power of 0.5Hz to 100Hz, 0.1A to 100000A, and 120° phase difference to the electromagnetic winding 66 inside the electromagnetic separation coil 61; the electromagnetic separation coil 61 has an internal electromagnetic winding 66; the electromagnetic winding 66 is a three-phase distributed winding with a total of 3 windings, each winding has 2 sets of stage pairs, and the AC phase difference between adjacent windings is -120° and 120° respectively, generating a rotating magnetic field in the Level II electromagnetic separation tube 40;

[0095] The induced current generated by the liquid lead causes it to move towards the axis under the influence of the rotating magnetic field. Since the conductivity of the large inclusions 31 is much lower than that of the liquid lead, the Lorentz force they experience is much smaller. As the liquid lead moves towards the axis, the large inclusions 31 move relative to the liquid lead towards the tube wall, achieving local separation of the large inclusions 31. During this process, the large inclusions 31 will further collide, aggregate, and grow.

[0096] Subsequently, the large inclusion 31 leaves the electromagnetic separation module 60 and is guided to the pipe wall by the diversion baffle 51 at the bottom of the filter assembly 50, and is intercepted by the filter screen 52.

[0097] The purified liquid lead flows out of the Class II electromagnetic separation tube 40.

[0098] It should be noted that the entire purification channel has low resistance and will not experience clogging as in traditional filter traps.

[0099] The embodiments of this application have the following beneficial effects:

[0100] (1) The electromagnetic oscillation module promotes the aggregation and growth of fine inclusions in liquid metal into large particles. The electromagnetic separation module causes the inclusions to migrate directionally to the separation zone at the pipe wall and collect to the filter assembly. It can deeply purify the fine inclusions in liquid metal. It combines electromagnetic oscillation, electromagnetic separation and collection functions, and has the advantages of non-contact separation and continuous purification.

[0101] (2) The filter components are detachable and replaceable, and a variety of filter screens with different filtration precisions can be selected to prevent the captured impurities from flowing back into the liquid metal.

[0102] (3) Both the electromagnetic oscillation module and the electromagnetic separation module have cooling water jackets and insulation layers. The cooling water jackets are used to dissipate the heat of the metal, and the insulation layers prevent the liquid metal from solidifying, thereby maintaining the flow state.

[0103] (4) The auxiliary instruments include a level gauge, a pressure sensor, and a thermocouple. The pressure sensor monitors the liquid level and gas pressure in the Class I electromagnetic oscillating tube and the Class II electromagnetic separation tube in real time. The air is vented and vented through the air blowing pipe and the exhaust pipe to change the pressure in the upper gas space and adjust the liquid level of the liquid metal.

[0104] (5) The main flow channel of the purification system has low resistance and will not experience clogging as in traditional filter traps.

[0105] The present application has been described in detail above with reference to the embodiments. However, the present application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present application. All content not described in detail in this application can be derived from existing technology.

Claims

1. An electromagnetic purification device for removing inclusions from liquid metal, characterized in that, It includes a Class I electromagnetic oscillation tube (10), an electromagnetic oscillation module (20), a Class II electromagnetic separation tube (40), a filter assembly (50), and an electromagnetic separation module (60); The first-level electromagnetic oscillation tube (10) is inserted into the electromagnetic oscillation coil (21) inside the electromagnetic oscillation module (20); The Level II electromagnetic separation tube (40) is inserted into the electromagnetic separation coil (61) inside the electromagnetic separation module (60); The filter assembly (50) is inserted into the stage II electromagnetic separation tube (40); Liquid metal containing inclusions (30) enters the first-stage electromagnetic oscillation tube (10) from the first-stage inlet (11), flows through the electromagnetic oscillation module (20), and generates large-sized inclusions (31) that accumulate in the top slag layer (32). Liquid metal containing large-sized inclusions (31) flows out from the first-stage drain (12), enters the second-stage electromagnetic separation tube (40) through the second-stage inlet (41), flows through the electromagnetic separation module (60), causing the large-sized inclusions (31) to be partially separated and collected into the filter assembly (50); the filtered liquid metal flows out from the second-stage drain (42).

2. The electromagnetic purification device for removing inclusions from liquid metal according to claim 1, characterized in that, The electromagnetic oscillation module (20) is equipped with an electromagnetic oscillation coil (21), a Class I power supply module (22), a Class I insulation layer (23), and a Class I cooling water jacket (24); The Class I power supply module (22) supplies an alternating current of 1Hz to 1000Hz to the electromagnetic oscillation coil (21) to generate an alternating magnetic field of 0.01T to 10T; The Class I insulation layer (23) is in close contact with the outer wall of the Class I electromagnetic oscillation tube (10); The electromagnetic oscillation module (20) runs through the upper and lower parts of the first-stage cooling water jacket (24).

3. The electromagnetic purification device for removing inclusions from liquid metal according to claim 1, characterized in that, The filter assembly (50) includes a flow divider (51) and a filter screen (52); The filter assembly (50) is connected to the stage II electromagnetic separator (40) via a locking pin (53); The diversion baffle (51) surrounds the lower half of the filter assembly (50) and is cylindrical, conical, frustum-shaped, wedge-shaped, or a combination of the above. The filter screen (52) is distributed in an L-shape at both ends of the upper surface of the filter assembly (50); The large inclusions (31) are collected in the filter assembly (50), guided to the pipe wall by the diversion baffle (51), and intercepted by the filter screen (52).

4. The electromagnetic purification device for removing inclusions from liquid metal according to claim 3, characterized in that, The filter screen (52) is a sintered metal element or a woven metal mesh, with a filtration accuracy of 50μm to 5mm; The filter screen (52) has a structure consisting of segments with one or more filtration accuracies. When the filter screen (52) is a segmented combination of multiple filtration precisions, the sintered metal elements with filtration precisions of 5mm-3mm-1mm-500μm are arranged from top to bottom.

5. The electromagnetic purification device for removing inclusions from liquid metal according to claim 1, characterized in that, The electromagnetic separation module (60) is equipped with an electromagnetic separation coil (61), a level II power supply module (62), a level II insulation layer (63), and a level II cooling water jacket (64); The Level II power supply module (62) provides three-phase AC power of 0.5Hz to 100Hz, 0.1A to 100000A, and 120° phase difference to the electromagnetic winding (66) inside the electromagnetic separation coil (61); The Class II insulation layer (63) is in close contact with the outer wall of the Class II electromagnetic separation tube (40); The Level II cooling water jacket (64) is permeated by the electromagnetic separation module (60) from top to bottom.

6. The electromagnetic purification device for removing inclusions from liquid metal according to claim 5, characterized in that, The electromagnetic separation coil (61) is externally encased in a silicon steel sheet shell (65); The electromagnetic separation coil (61) has an internal electromagnetic winding (66); The electromagnetic winding (66) is a three-phase distributed winding with a total of 3 windings. Each winding has 2 sets of stage pairs. The AC phase difference between adjacent windings is -120° and 120°, respectively, which can generate a rotating magnetic field in the II-stage electromagnetic separator (40).

7. The electromagnetic purification device for removing inclusions from liquid metal according to claim 1, characterized in that, The first-stage electromagnetic oscillation tube (10) and the second-stage electromagnetic separation tube (40) are respectively provided with a first-stage exhaust port (13) and a second-stage exhaust port (43) at the top, and respectively provided with a first-stage lower drain port (14) and a second-stage lower drain port (44) at the bottom. The first-stage exhaust port (13) is provided with an air blowing pipe I (18) and an auxiliary instrument I (19) on both sides; the second-stage exhaust port (43) is provided with an air blowing pipe II (48) and an auxiliary instrument II (49) on both sides.

8. An electromagnetic purification device for removing inclusions from liquid metal according to claim 1 or 7, characterized in that, The large inclusions (31) that accumulate in the top slag layer (32) can also be periodically blown into the second-stage electromagnetic separation tube (40) through the air blowing pipe I (18).

9. An electromagnetic purification device for removing inclusions from liquid metal according to claim 1 or 7, characterized in that, The first-stage electromagnetic oscillation tube (10) and the second-stage electromagnetic separation tube (40) are respectively topped with top cover I (15) and top cover II (45); Below the top cover I (15) and the top cover II (45) is a gas space, through which 99.9% argon gas, or 0.1-5 vol.% hydrogen / argon gas mixture, or 0.1-5 vol.% oxygen / argon gas mixture are blown in through the blowing pipe I (18) and the blowing pipe II (48) respectively; The liquid level in the first-stage electromagnetic oscillating tube (10) and the second-stage electromagnetic separation tube (40) is controlled by the pressure of the gas space.

10. An electromagnetic purification device for removing inclusions from liquid metal according to claim 7, characterized in that, The auxiliary instrument I (19) and auxiliary instrument II (49) include a level gauge, a pressure sensor, and a thermocouple; The pressure sensor monitors the liquid level and gas pressure in the Class I electromagnetic oscillating tube (10) and Class II electromagnetic separation tube (40) in real time.

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