Magnetic control rotational flow steel ladle and clean steel refining method

Abstract

The invention relates to a magnetic control rotational flow steel ladle and a clean steel refining method. The magnetic control rotational flow steel ladle comprises a steel ladle with a shell made of non-magnetic steel; the electromagnetic induction assembly is arranged on the periphery of the steel ladle; the cross section of the steel ladle is round, at least one argon through hole is formed in the bottom of the steel ladle, the distance between the center of the argon through hole and the circle center of the bottom of the steel ladle is 1 / 2-3 / 4 of the radius of the bottom of the steel ladle, the argon through hole is filled with a porous air brick, and the porous air brick is connected with an argon source. Argon bubbles are blown to molten steel in a steel ladle through the eccentrically-arranged porous air brick, the electromagnetic induction assembly provides an external magnetic field for the molten steel to drive the molten steel to horizontally rotate, and due to the fact that the position of the argon through hole deviates from the circle center of the bottom of the steel ladle, the argon bubbles are distributed in the steel ladle in a dispersed mode along with the horizontally-rotating molten steel; and the argon bubbles can capture small-particle inclusions in the molten steel easily, impact on a slag-gold interface is restrained through the argon bubbles distributed in a dispersed mode, slag holes are restrained from being formed, and the quality of clean steel is improved easily.

Description

Technical Field

[0001] The invention relates to the technical field of clean steel smelting, and in particular to a magnetically controlled cyclone ladle and a clean steel refining method. Background Art

[0002] High-quality clean steel is an important basic material for advanced equipment manufacturing. Developing new high-quality clean steel efficient smelting technologies with independent intellectual property rights is an important way to achieve overall high-quality and reduced-volume transformation of the steel industry under the background of “dual carbon”. It is of great strategic significance for ensuring the healthy and sustainable development of the advanced manufacturing industry.

[0003] Blowing argon from the bottom of the ladle is an important means of clean steel smelting. Argon bubbles carry non-metallic inclusions to the surface of the molten steel through surface adhesion and wake capture, and are then adsorbed and removed by the slag layer. In addition, the bubbles float up and drive the surrounding molten steel to move, which can even out the temperature and composition of the molten steel. However, in the prior art, large bubbles float up and drive the surrounding molten steel to move upward, forming a macro plume. The bubbles in the macro plume will continue to impact the slag-metal interface upward, exposing part of the molten steel to the air, forming slag eyes, causing negative effects such as temperature loss, secondary oxidation and slag rolls in the molten steel. In addition, the bubble group formed by the bottom blowing of the ladle is distributed more concentratedly, and the sweeping area of ​​the bubbles on the molten steel is limited. The bubbles are affected by the macro plume, resulting in a fast floating speed of the bubbles in the ladle and a short residence time, which is not conducive to the capture of small particle inclusions in the molten steel by the bubbles. The above results all lead to a reduction in the quality of clean steel.

[0004] To this end, the present invention provides a magnetically controlled cyclone ladle and a clean steel refining method. Summary of the invention

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a magnetically controlled cyclonic ladle and a clean steel refining method to solve the technical problems in the prior art that a macroscopic plume formed by concentrated floating of large bubbles impacts the slag-metal interface, so that part of the molten steel is exposed to the air to form slag eyes, resulting in negative effects such as temperature loss of the molten steel, secondary oxidation and slag curling; and the bubble group formed by the bottom blowing of the ladle is distributed more concentratedly, the sweeping area of ​​the argon bubbles on the molten steel is limited, and the argon bubbles are affected by the macroscopic plume, the floating speed in the ladle is fast, the residence time is short, which is not conducive to the argon bubbles to capture small particle inclusions, resulting in reduced quality of the clean steel.

[0006] In order to achieve the above-mentioned purpose, the first aspect of the present invention provides a magnetically controlled cyclone ladle, and the technical solution adopted includes: a ladle, whose shell material is non-magnetic steel; an electromagnetic induction component, which is arranged on the periphery of the ladle; wherein the cross-section of the ladle is circular, and at least one argon through hole is provided at the bottom of the ladle, and the distance between the center of the argon through hole and the center of the circle of the bottom of the ladle is 1 / 2 to 3 / 4 of the radius of the bottom of the ladle; the argon through hole is filled with porous air bricks, and the porous air bricks are connected to an argon source.

[0007] Optionally, the porous breathable brick includes: breathable holes, which are opened in the porous breathable brick, and the number of the breathable holes is 20-100.

[0008] Optionally, the area of ​​the air holes accounts for 15%-40% of the area of ​​the porous air brick.

[0009] Optionally, the size of the air holes is 0.5mm-5mm.

[0010] Optionally, the electromagnetic induction component includes: an iron core, which is sleeved outside the ladle; a tooth portion, which extends radially from the inner wall of the iron core; and an energized coil, which is sleeved outside the tooth portion.

[0011] Optionally, there are multiple teeth, and the multiple teeth are evenly spaced and distributed on the circumferential inner wall of the core.

[0012] Optionally, the energized coils are wound around the outside of each tooth in a winding manner, the energized coils are arranged in the circumferential direction of the ladle in the horizontal direction, and each group of energized coils is supplied with three-phase alternating current.

[0013] Optionally, the upper surface of the energized coil is lower than the upper surface of the ladle; and the lower surface of the energized coil is higher than the lower surface of the ladle.

[0014] A second aspect of the present invention provides a clean steel refining method, the clean steel refining method comprising: S1: The electromagnetic induction component is fed with three-phase alternating current to generate an alternating magnetic field, and the alternating magnetic field is vector-synthesized to obtain a horizontal periodically rotating magnetic field; S2: The horizontal periodically rotating magnetic field acts on the ladle, and the magnetic flux lines of the magnetic field rotate and cut the molten steel in the ladle, causing the molten steel in the ladle to generate an induced current; S3: The induced current generated by the molten steel interacts with the horizontal periodically rotating magnetic field to generate the Lorentz force, which drives the molten steel to produce a stable horizontal rotation; S4: The distance between the center of the argon through hole and the bottom center of the ladle is 1 / 2 to 3 / 4 of the radius of the bottom of the ladle. The argon source forms argon bubbles through the porous air-permeable bricks in the argon through hole, and the argon bubbles are passed into the molten steel; S5: The argon bubbles in the molten steel rotate circumferentially in the molten steel along with the electromagnetic vortex, so that the argon bubbles are dispersed in the molten steel.

[0015] The beneficial effects of the present invention are: The invention provides a magnetically controlled cyclonic ladle, which blows argon bubbles from porous air-permeable bricks in argon through holes at the bottom of the ladle to molten steel. Since the distance between the center of the argon through hole and the center of the bottom circle of the ladle is limited to 1 / 2 to 3 / 4 of the radius of the bottom of the ladle, the porous air-permeable bricks arranged in the argon through holes blow argon bubbles to achieve eccentric bottom blowing (that is, the position where the argon bubbles enter the ladle deviates from the center of the bottom circle of the ladle). Combined with the external magnetic field provided by the electromagnetic induction component for the molten steel, the Lorentz force generated by the external magnetic field drives the molten steel to perform horizontal rotation in the ladle, and the viscous momentum transmission between each layer of molten steel is utilized to finally form a stable rotating flow field in the ladle, thereby driving the argon bubbles to be uniformly dispersed and distributed in the molten steel, thereby suppressing the macro plume caused by the concentrated floating of large bubbles, reducing the floating speed of the argon bubbles, and the dispersedly distributed argon bubbles reduce the impact force on the slag-metal interface, suppress the formation of slag eyes, and prevent the negative effects of molten steel temperature loss, secondary oxidation, slag rolling, etc. caused by partial exposure of molten steel to the air.

[0016] Furthermore, the present invention limits the distance between the center of the argon through hole and the center of the bottom circle of the ladle to 1 / 2 to 3 / 4 of the radius of the bottom circle of the ladle, so that the argon bubbles are distributed along the circumference of the ladle under the action of the external magnetic field provided by the electromagnetic induction component, and the argon bubbles also have a certain movement toward the center of the circle under the action of the centripetal force generated by the rotating flow field, so that the argon bubbles are diffusely distributed in the ladle. The diffusely distributed argon bubbles have a slow floating speed, a long residence time, and a large sweeping area, which is more conducive to the argon bubbles to capture small particle inclusions in the molten steel, effectively improve the removal rate of small particle inclusions in the molten steel, achieve deep purification of the molten steel, and are more conducive to improving the quality of clean steel.

[0017] Furthermore, since the argon bubbles provide a vertical force to the molten steel during the rising process, the molten steel is stirred in the vertical direction. The electromagnetic induction component of the present invention provides an external magnetic field for the molten steel, and the Lorentz force generated by the external magnetic field drives the molten steel to rotate horizontally in the ladle, so that the molten steel is stirred in the horizontal direction. Therefore, the molten steel in the present invention is stirred in both horizontal and vertical directions, which improves the stirring effect of the molten steel, shortens the mixing time of the molten steel, and realizes efficient mixing of the molten steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the magnetically controlled cyclone ladle of the present invention blowing argon gas into molten steel; Figure 2 It is a schematic structural diagram of the magnetically controlled swirl ladle of the present invention from another angle; Figure 3 It is a schematic diagram of the structure of the porous air-permeable brick of the present invention; Figure 4It is a schematic diagram of blowing argon gas from a ladle to molten steel without the effect of electromagnetic swirl in the prior art.

[0019] Description of reference numerals: 1. Energized coil; 2. Iron core; 21. Tooth; 3. Ladle; 4. Porous air brick; 41. Air hole. DETAILED DESCRIPTION

[0020] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0021] Embodiment: An embodiment of the present invention provides a magnetically controlled cyclone ladle, such as Figure 1 and Figure 2 As shown, it includes: a ladle 3, whose shell material is non-magnetic steel; an electromagnetic induction component, which is arranged on the periphery of the ladle 3; wherein the cross-section of the ladle 3 is circular, and at least one argon through hole is provided at the bottom of the ladle 3, and the distance between the center of the argon through hole and the center of the bottom circle of the ladle 3 is 1 / 2 to 3 / 4 of the radius of the bottom of the ladle 3; the argon through hole is filled with a porous air-permeable brick 4, and the porous air-permeable brick 4 is connected to an argon source.

[0022] The magnetically controlled cyclone ladle in this embodiment is provided with argon through holes at the bottom of the ladle 3, and porous air-permeable bricks 4 are provided at the argon through holes, so that the porous air-permeable bricks 4 blow argon bubbles from the bottom of the ladle 3 to the molten steel in the ladle 3, and the shearing action on the surface of the air holes 41 of the porous air-permeable bricks 4 forces the argon bubbles to leave the air holes 41, thereby suppressing the non-wetting interface effect in the argon bubble generation process.

[0023] Exemplarily, there are two argon through holes in the present embodiment, and a porous air-permeable brick 4 is arranged in each argon through hole. Since the distance between the center of the argon through hole and the center of the bottom circle of the ladle 3 is 1 / 2 to 3 / 4 of the radius of the bottom of the ladle 3, the distance between the center of the porous air-permeable brick 4 and the center of the bottom circle of the ladle 3 is also 1 / 2 to 3 / 4 of the radius of the bottom of the ladle 3. The distance between the center of the porous air-permeable brick 4 and the center of the bottom circle of the ladle 3 in the present embodiment is 2 / 3 of the radius of the bottom of the ladle 3. This arrangement can ensure that the argon bubbles are distributed circumferentially along the ladle 3 under the action of the external magnetic field provided by the electromagnetic induction component, and under the action of the centripetal force generated by the rotating flow field, the argon bubbles still have a certain movement toward the center of the circle, thereby making the argon bubbles diffusely distributed in the ladle 3. The two argon through holes in the present embodiment are symmetrically arranged relative to the center of the bottom circle of the ladle 3, so that the effect of the diffuse distribution of the argon bubbles is better.

[0024] Exemplarily, there are three argon through holes in this embodiment, and the three argon through holes are evenly spaced around the bottom center of the ladle 3. A porous air-permeable brick 4 is arranged in each argon through hole. Since the distance between the center of the argon through hole and the bottom center of the ladle 3 is 1 / 2 to 3 / 4 of the bottom radius of the ladle 3, the distance between the center of the three porous air-permeable bricks 4 and the bottom center of the ladle 3 is 1 / 2 to 3 / 4 of the bottom radius of the ladle 3. The distance between the center of the three porous air-permeable bricks 4 and the bottom center of the ladle 3 in this embodiment is 3 / 4 of the bottom radius of the ladle 3. This arrangement can ensure that the argon bubbles are distributed along the circumference of the ladle 3 under the action of the external magnetic field provided by the electromagnetic induction component, and under the action of the centripetal force generated by the rotating flow field, the argon bubbles still have a certain movement toward the center of the circle, so that the argon bubbles are dispersed in the ladle 3. Since there are three argon through holes in this embodiment, more argon bubbles can be dispersed in the larger ladle 3, ensuring the high quality requirements of a larger amount of molten steel. The specific number of argon through holes and porous air-permeable bricks 4 can be determined according to the actual volume of the ladle 3. The larger the volume of the ladle 3 is, the more argon through holes can be set as needed, and porous air-permeable bricks 4 can be set in the argon through holes.

[0025] Exemplarily, the outer shell material of the ladle 3 in this embodiment is made of non-magnetic steel to ensure that the electromagnetic field can penetrate the outer shell and refractory layer of the ladle 3, thereby driving the molten steel, avoiding the magnetic field loss caused by the ladle 3, and avoiding the electromagnetic field heating the outer shell of the ladle 3.

[0026] Exemplarily, the current passed through the energized coil 1 is 100A-5000A, the current frequency is 1Hz-20Hz, and the phase difference of the alternating current passed through each energized coil 1 is 120°.

[0027] For example, Figure 1 and Figure 2 As shown, the cross section of the ladle 3 is circular, and the circular area at the upper opening of the ladle 3 is larger than the circular area at the bottom of the ladle 3 .

[0028] In addition, if the bottom blowing argon of ladle 3 does not have the electromagnetic swirl provided by the electromagnetic induction component, such as Figure 4As shown, the argon bubbles float upward and drive the molten steel in the ladle 3 to flow upward. On the one hand, since large bubbles float up in a concentrated manner to form a macro plume, the bubbles of the macro plume will continue to impact the slag-metal interface upward, resulting in the formation of slag eyes at the slag-metal interface, exposing part of the molten steel to the air, causing negative effects such as temperature loss of the molten steel, secondary oxidation and slag rolling; on the other hand, since the macro plume mainly provides an upward force, the central area of ​​the bottom of the ladle 3 and the area near the side wall of the bottom of the ladle 3 are difficult to be driven by the argon bubbles, resulting in the formation of a low flow rate area, such a low flow rate area is the "dead zone", the "dead zone" cannot effectively stir the molten steel, and the capture rate of the argon bubbles on the small particle inclusions in the "dead zone" is greatly reduced. The molten steel in the "dead zone" can neither be efficiently mixed nor deeply purified, thereby reducing the quality of the clean steel.

[0029] In the case where the electromagnetic induction component provides electromagnetic swirl, if the distance between the porous air-permeable brick 4 and the bottom center of the ladle 3 is small, that is, the distance is less than 1 / 2 of the radius of the bottom of the ladle 3, the area driven by the argon bubbles is closer to the central area in the ladle 3, and the centripetal force generated by the rotating flow field causes the argon bubbles to be concentrated in the center of the electromagnetic swirl, and then floats up along the center of the electromagnetic swirl. The argon bubbles cannot further diffuse in the ladle 3 along the circumferential direction, and the swept area of ​​the molten steel is reduced, which is not conducive to the removal of inclusions by the argon bubbles. The concentrated floating bubbles continue to impact the slag-metal interface at the top layer, and then form slag eyes, which brings negative consequences. In addition, since the porous air-permeable brick 4 is closer to the central area in the ladle 3, the vertical velocity of the molten steel near the side wall of the ladle 3 will be reduced, that is, the "dead zone" near the side wall of the ladle 3 will increase, resulting in a significant decrease in the stirring effect and purification degree of the molten steel in this area.

[0030] In the case where the electromagnetic induction component provides electromagnetic swirl, if the distance between the porous air-permeable brick 4 and the bottom center of the ladle 3 is too large, that is, the distance is greater than 3 / 4 of the radius of the bottom of the ladle 3, the initial generation area of ​​the argon bubbles is closer to the inner wall of the ladle 3. During the argon injection process, the initially generated argon bubbles and the steel liquid rising flow generated by the argon bubble injection have a strong impact on the inner wall of the ladle 3, which will aggravate the erosion of the inner wall of the ladle 3. In addition, since the porous air-permeable brick 4 is far away from the bottom center of the ladle 3, the argon bubbles will diffuse farther to the center of the rotating flow field, and the number of argon bubbles in the central area of ​​the ladle 3 will be small, resulting in a significant decrease in the stirring effect of the steel liquid in this area and the inclusion removal rate.

[0031] Therefore, in this embodiment, the distance between the center of the argon through hole and the bottom circle center of the ladle 3 is set to 1 / 2 to 3 / 4 of the bottom radius of the ladle 3, so as to realize the eccentric bottom blowing of argon bubbles. Under the joint action of electromagnetic swirl and eccentric bottom blowing, the argon bubbles are dispersed and distributed in the ladle 3. Firstly, the dispersed distribution of argon bubbles in the ladle 3 suppresses the macro plume caused by the concentration of large bubbles, reduces the floating speed of argon bubbles, reduces the impact force on the slag-metal interface, and avoids the formation of slag eyes; secondly, the dispersed argon bubbles have a slow floating speed, a long residence time, and a large sweeping area, which is more conducive to the argon bubbles to capture small particle inclusions in the molten steel, and effectively improves the removal rate of small particle inclusions in the molten steel; thirdly, the molten steel is stirred in both horizontal and vertical directions, thereby improving the stirring effect on the molten steel. In summary, the magnetically controlled swirl ladle of this embodiment is conducive to the deep purification and efficient mixing of the molten steel, and is more conducive to improving the quality of clean steel.

[0032] In a possible embodiment, Figure 1 and Figure 3 As shown, the porous air brick 4 includes: air holes 41, which are opened in the porous air brick 4, and the number of the air holes 41 is 20-100.

[0033] For example, by setting the number of air holes 41, it is ensured that the argon gas blown out from the porous air brick 4 is relatively refined argon bubbles, which then cooperate with the electromagnetic field provided by the electromagnetic induction component to finally form diffused argon bubbles. The dispersed argon bubbles have a slow floating speed, a long residence time, and a large sweeping area, which can effectively improve the removal rate of small particle inclusions in the molten steel and facilitate the deep purification of the molten steel.

[0034] In a possible embodiment, Figure 3 As shown, the area of ​​the air holes 41 accounts for 15%-40% of the area of ​​the porous air brick 4.

[0035] For example, if the proportion of the air holes 41 is too small, it is easy to cause insufficient air permeability of the porous air brick 4, and it is impossible to meet the demand for argon to enter the ladle 3 through the porous air brick 4; if the proportion of the air holes 41 is too large, the overall strength of the porous air brick 4 will decrease and the brittleness will increase, so the porous air brick 4 will be easily damaged during long-term use, which is not conducive to the long-term use of the porous air brick 4.

[0036] In a possible embodiment, Figure 3 As shown, the size of the air vent 41 is 0.5 mm-5 mm.

[0037] Exemplarily, the air holes 41 in this embodiment are preferably 3 mm. Setting the air holes 41 to such a size can reduce the initial size of the argon bubbles, improve the flowability of the argon bubbles, facilitate the diffusion of the argon bubbles in the ladle 3, and effectively prevent the "dead hole phenomenon" caused by the blockage of the air holes 41. This size is more conducive to the long-term use of the porous air permeable wheel 4.

[0038] Exemplarily, the size of the air pores 41 is 0.5mm-5mm, so that the initial diameter of the argon bubbles is 0.5mm-5mm. The tiny argon bubbles in this diameter range further increase the contact area with the small particle inclusions in the molten steel. The argon bubbles in this size range have a higher capture rate for the small particle inclusions in the molten steel, which is more conducive to the deep purification of the molten steel.

[0039] In a possible embodiment, Figure 2 As shown, the electromagnetic induction component includes: an iron core 2, which is sleeved outside the ladle 3; a tooth portion 21, which extends radially from the inner wall of the iron core 2; and an energized coil 1, which is sleeved outside the tooth portion 21.

[0040] For example, the material of the core 2 is any one of ferrite, silicon steel sheet ferrite mixed material or pure iron, all of which have the advantages of high magnetic permeability, low hysteresis loss, etc. Among them, silicon steel sheet is preferred, which has the characteristics of high magnetic saturation and high induction intensity, making silicon steel sheet the most widely used core 2 raw material in various motors, transformers, generators and electromagnetic metallurgical equipment.

[0041] In a possible embodiment, Figure 2 As shown, there are multiple teeth 21 , and the multiple teeth 21 are evenly spaced and distributed on the circumferential inner wall of the core 2 .

[0042] Exemplarily, six teeth 21 are provided inside the core 2 in this embodiment, and the six teeth 21 are evenly spaced and distributed on the circumferential inner wall of the core 2 , and the number of the energized coils 1 is also six, and the six energized coils 1 are respectively wound around the outside of the six teeth 21 .

[0043] In a possible embodiment, Figure 2 As shown, the powered coils 1 are wound around the outside of each tooth portion 21 in a winding manner, the powered coils 1 are arranged in the circumferential direction of the ladle 3 in the horizontal direction, and each group of powered coils 1 is supplied with three-phase alternating current.

[0044] Exemplarily, the energized coil 1 is wound on each tooth 21 of the iron core 2 in a winding manner, and is specifically arranged in a circle in the horizontal direction of the circumference of the ladle 3. The energized coil 1 is supplied with three-phase alternating current, and the phase of the alternating current supplied to each energized coil 1 differs by 120°. The principle is that the rotating magnetic field can cut the molten steel once in the circumferential direction for each rotation cycle. Since there is a relative motion between the molten steel and the rotating electromagnetic field, it is equivalent to the conductive molten steel cutting the rotating electromagnetic field. According to Faraday's electromagnetic induction principle, an induced current is generated inside the molten steel, and the induced current interacts with the external magnetic field to generate an electromagnetic force, thereby driving the molten steel to rotate horizontally.

[0045] In a possible embodiment, Figure 1 As shown, the upper surface of the energized coil 1 is lower than the upper surface of the ladle 3 ; the lower surface of the energized coil 1 is higher than the lower surface of the ladle 3 .

[0046] Exemplarily, after the energized coil 1 is wound on the iron core 2 in a winding manner, the final vertical cumulative height is lower than the height of the ladle 3, and the upper surface of each energized coil 1 is lower than the upper surface of the ladle 3; the lower surface of the energized coil 1 is higher than the lower surface of the ladle 3. This arrangement ensures that the magnetic field provided by the energized coil 1 effectively acts on the molten steel in the ladle 3, and ensures that the argon bubbles in the molten steel are affected by the electromagnetic vortex, thereby forming dispersed argon bubbles.

[0047] This embodiment also provides a clean steel refining method, which includes: S1: The electromagnetic induction component is fed with three-phase alternating current to generate an alternating magnetic field, and the alternating magnetic field is vector-synthesized to obtain a horizontal periodically rotating magnetic field; S2: The horizontal periodically rotating magnetic field acts on the ladle 3, and the magnetic flux lines of the magnetic field rotate and cut the molten steel in the ladle 3, causing the molten steel in the ladle 3 to generate an induced current; S3: The induced current generated by the molten steel interacts with the horizontal periodically rotating magnetic field to generate the Lorentz force, which drives the molten steel to produce a stable horizontal rotation; S4: The distance between the center of the argon through hole and the center of the bottom of the ladle 3 is 1 / 2 to 3 / 4 of the radius of the bottom of the ladle 3. The argon source forms argon bubbles through the porous air-permeable bricks 4 in the argon through hole, and the argon bubbles are passed into the molten steel; S5: The argon bubbles in the molten steel rotate circumferentially in the molten steel along with the electromagnetic vortex, so that the argon bubbles are dispersed in the molten steel.

[0048] The above method enables the rotating magnetic field provided by the energized coil 1 in the electromagnetic induction component to cut the molten steel once in the circumferential direction for each rotation cycle. Due to the relative motion between the molten steel and the rotating magnetic field, the magnetic flux lines of the magnetic field rotate and cut the molten steel in the ladle 3. According to the Faraday electromagnetic induction principle, an induced current is generated inside the molten steel. The induced current interacts with the external magnetic field to generate an electromagnetic force, which drives the molten steel to rotate. After the argon bubbles are separated from the air holes 41, they are further broken and refined by the electromagnetic vortex and diffused with the electromagnetic vortex. In addition, by setting the distance between the center of the porous air-permeable brick 4 and the bottom center of the ladle 3 to 1 / 2 to 3 / 4 of the bottom radius of the ladle 3, the eccentric bottom blowing of the argon bubbles is realized, that is, the position where the argon bubbles enter the ladle from the bottom of the ladle 3 deviates from the bottom center of the ladle 3, so that the argon bubbles are dispersed and distributed in the ladle 3 with the horizontal vortex of the molten steel, which is conducive to the efficient mixing and deep purification of the molten steel and the improvement of the quality of the clean steel.

[0049] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In the present invention, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0051] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A magnetically controlled cyclone ladle, characterized in that: include: A ladle, the outer shell of which is made of non-magnetic steel; An electromagnetic induction component is arranged at the periphery of the ladle; The cross section of the ladle is circular, and at least one argon through hole is provided at the bottom of the ladle, and the distance between the center of the argon through hole and the center of the circle of the bottom of the ladle is 1 / 2 to 3 / 4 of the radius of the bottom of the ladle; The argon through hole is filled with a porous gas-permeable brick, and the porous gas-permeable brick is connected to an argon gas source.

2. The magnetically controlled cyclone ladle according to claim 1, characterized in that: The porous air-permeable brick comprises: Air holes are provided in the porous air-permeable brick, and the number of the air holes is 20-100.

3. The magnetically controlled cyclone ladle according to claim 2, characterized in that: The area of ​​the air holes accounts for 15%-40% of the area of ​​the porous air-permeable brick.

4. The magnetically controlled cyclone ladle according to claim 3, characterized in that: The size of the air holes is 0.5 mm to 5 mm.

5. The magnetically controlled cyclone ladle according to claim 1, characterized in that: The electromagnetic induction component comprises: An iron core, sleeved outside the ladle; A tooth portion extending radially from the inner wall of the core; The energized coil is sleeved outside the tooth portion.

6. The magnetically controlled cyclone ladle according to claim 5, characterized in that: There are multiple teeth, and the multiple teeth are evenly spaced and distributed on the circumferential inner wall of the core.

7. The magnetically controlled cyclone ladle according to claim 6, characterized in that: The energized coils are wound around the outside of each tooth in a winding manner, and are arranged in a circumferential direction of the ladle in a horizontal direction, and three-phase alternating current is supplied to each group of the energized coils.

8. The magnetically controlled cyclone ladle according to claim 7, characterized in that: The upper surface of the energized coil is lower than the upper surface of the ladle; The lower surface of the energized coil is higher than the lower surface of the ladle.

9. A clean steel refining method, characterized in that: Using the magnetically controlled cyclone ladle according to any one of claims 1 to 8, the clean steel refining method comprises: S1: The electromagnetic induction component is fed with three-phase alternating current to generate an alternating magnetic field, and the alternating magnetic field is vector-synthesized to obtain a horizontal periodically rotating magnetic field; S2: A horizontal periodically rotating magnetic field acts on the ladle, and the magnetic flux lines of the magnetic field rotate and cut the molten steel in the ladle, causing the molten steel in the ladle to generate an induced current; S3: The induced current generated by the molten steel interacts with the horizontal periodically rotating magnetic field to generate the Lorentz force, which drives the molten steel to produce a stable horizontal rotation; S4: The distance between the center of the argon through hole and the center of the bottom circle of the ladle is 1 / 2 to 3 / 4 of the radius of the bottom of the ladle, and the argon source passes through the porous air-permeable bricks in the argon through hole to allow argon bubbles to pass into the molten steel; S5: The argon bubbles in the molten steel rotate circumferentially in the molten steel along with the electromagnetic vortex, so that the argon bubbles are dispersed in the molten steel.

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