Molten steel treatment mechanism capable of reducing alloy mixing time and alloy mixing method

Abstract

The invention provides a molten steel treatment mechanism capable of reducing alloy mixing time and an alloy mixing method. The molten steel treatment mechanism comprises a steel ladle, a steel pipe and a steel pipe, the blowing mechanism is communicated with the accommodating cavity; the electromagnetic stirrer is arranged at the bottom of the outer wall of the steel ladle, the electromagnetic stirrer comprises a plurality of windings, and the windings are arranged in a row and symmetrically distributed with the center of the steel ladle as the center to form a winding part; the ratio of the length of the winding part to the inner diameter of the bottom of the steel ladle is 1120: (2540-2640); and the number of the windings is 8 to 12. In the molten steel treatment mechanism, the stirrer coil adopts the centralized winding, the electromagnetic stirrer belongs to a traveling wave stirrer, and the arrangement of the winding is controlled to be matched with the blowing mechanism, so that the stirring time required by the alloy is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgy, and in particular to a molten steel processing mechanism and an alloy mixing method for reducing alloy mixing time. Background Art

[0002] The electromagnetic stirrer is installed in the ladle to stir the molten steel in the ladle so that the molten steel can be stirred quickly and evenly. The main advantage of electromagnetic stirring is that the electromagnetic force and stirring state can be adjusted by adjusting the various parameters of the stirrer. For example, the stirring direction can be changed at any time, and the stirring intensity can be changed and adjusted at will. This is an advantage that cannot be replaced by other stirring methods (especially permanent magnetic stirring). Moreover, the low-frequency traveling wave magnetic field generated by the electromagnetic stirrer penetrates the furnace shell and lining into the molten pool to ensure that the slag layer is not damaged and prevent secondary oxidation of the molten steel.

[0003] However, current electromagnetic stirrers require a long time to evenly mix the molten steel. Summary of the invention

[0004] The main purpose of the present invention is to provide a molten steel treatment mechanism and an alloy mixing method for reducing alloy mixing time, so as to solve the technical problem that an electromagnetic stirrer takes a long time to mix the molten steel evenly.

[0005] To achieve the above object, the present invention provides a molten steel treatment mechanism for reducing alloy mixing time, comprising:

[0006] A ladle having a holding chamber for holding molten steel;

[0007] An air blowing mechanism, connected to the accommodating cavity;

[0008] An electromagnetic stirrer is arranged at the bottom of the outer wall of the ladle, and the electromagnetic stirrer includes a plurality of windings, which are arranged in a row and symmetrically distributed around the center of the ladle to form a winding part;

[0009] The ratio of the length of the winding part to the bottom inner diameter of the ladle is 1120:(2540-2640); the number of the windings is 8-12.

[0010] According to an implementation manner of the present application, the windings are equally spaced, and the ratio of the length, width and height of the windings is (580-800): (250-400): (300-450); the ratio of the height of the winding to the height of the ladle is (200-400): (2500-4000).

[0011] According to an embodiment of the present application, in any of the windings, there is a core seat and a core body arranged on the core seat, the core body is arranged corresponding to the winding, and the windings are respectively wound on the core body; the ratio of the height of the core seat to the height of the core body is 100:290.

[0012] According to an embodiment of the present application, the number of turns of the coil of the winding is 90 to 110, and the diameter of the wire in the coil is 8 to 18 mm.

[0013] According to an embodiment of the present application, the distance between the top of the winding and the outer side of the bottom of the ladle is 8 to 12 mm.

[0014] According to an embodiment of the present application, the blowing mechanism is connected to the blowing hole at the bottom of the ladle, and the blowing hole is located at 1 / 2R-2 / 3R of the bottom of the ladle, where R is the radius of the bottom of the ladle.

[0015] According to an embodiment of the present application, the bottom of the ladle has air-permeable bricks, and the radius of the air-permeable bricks is 0.08 to 0.12 meters.

[0016] The present application also provides a method for treating molten steel, wherein the molten steel is added to the above-mentioned molten steel treatment mechanism for treatment.

[0017] According to the implementation of the present application, argon gas is introduced into the molten steel in the ladle through a blowing mechanism at a flow rate of 400 to 2000 L / min and a pressure of 0.3 to 1.3 MPa, and the electromagnetic stirrer is operated at an AC current intensity of 200A to 400A.

[0018] According to an embodiment of the present application, the argon gas is introduced into the molten steel in the ladle at a flow rate of 600-1000 L / min and a pressure of 0.45-07 MPa, and the electromagnetic stirrer is operated at a current intensity of 200A-400A.

[0019] In the above-mentioned molten steel processing mechanism, the agitator coil adopts centralized winding, and the electromagnetic agitator is a traveling wave agitator, which can form a large circulation with the ladle on one side as the ascending flow and the ladle wall on the other side as the descending flow, which can carry the alloy to the bottom of the ladle faster, thereby shortening the stirring time required for the alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of a molten steel treatment mechanism according to an embodiment of the present application;

[0022] Figure 2 This is a diagram of electromagnetic force distribution in a cross section of an electromagnetic stirrer Z=0.05m according to an embodiment of the present application;

[0023] Figure 3 This is a distribution diagram of the main stream of molten steel under the action of an electromagnetic stirrer according to an embodiment of the present application;

[0024] Figure 4 It is a temperature field distribution diagram under the action of an electromagnetic stirrer according to an embodiment of the present application;

[0025] Figure 5 is a schematic diagram of monitoring points in Example 1 of the present application;

[0026] Figure 6 is a graph of alloy mixing time under the action of the electromagnetic stirrer of Example 1 of the present application;

[0027] Figure 7 It is a schematic diagram of monitoring points of comparative example 1 of the present application;

[0028] Figure 8 This is a graph of alloy mixing time under the action of an electromagnetic stirrer in Comparative Example 1 of the present application;

[0029] Fig. 9 It is a structural schematic diagram of the molten steel processing mechanism of Comparative Example 2 of the present application;

[0030] Fig.10 This is a graph of alloy mixing time under the action of an electromagnetic stirrer in Comparative Example 2 of the present application;

[0031] Fig.11 is a schematic structural diagram of a winding according to an embodiment of the present application;

[0032] Fig.12 It is a schematic diagram of the monitoring points of comparative example 2 of the present application.

[0033] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings.

[0034] Explanation of the reference numerals: 100, ladle; 200, electromagnetic stirrer; 210, winding; 211, core seat; 212, core body; 213, coil. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that all directional indications (such as up, down, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, in the present invention, the descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0038] Furthermore, the technical solutions between the various embodiments of the present invention may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in the field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0039] The present invention provides a molten steel treatment mechanism, referring to Figure 1 and Fig.11 , including a ladle 100, a blowing mechanism and an electromagnetic stirrer 200. The ladle 100 has a containing chamber for containing molten steel. The blowing mechanism is connected to the containing chamber. The electromagnetic stirrer 200 is arranged at the bottom of the outer wall of the ladle 100, and the electromagnetic stirrer 200 includes a plurality of windings 210, which are arranged in a row and symmetrically distributed around the center of the ladle 100 to form a winding portion. The ratio of the length of the winding portion to the bottom inner diameter of the ladle 100 is 1120:(2540~2640); the number of the windings 210 is 8~12.

[0040] The electromagnetic stirrer 200 is a traveling wave stirrer, and the electromagnetic stirrer 200 adopts a concentrated winding 210. The center of the winding part is concentrically arranged with the bottom center of the outer wall of the ladle 100.

[0041] When the above conditions are met, the stirring area of ​​the electromagnetic stirrer 200 can basically cover all areas of the ladle 100 in the axial cross section. The electromagnetic stirrer 200 of this type generates traveling wave magnetic poles, that is, it generates a traveling wave magnetic field. The magnetic field moves or changes the magnetic poles in the form of traveling waves. In this way, the molten steel in the ladle 100 also moves in a traveling wave manner.

[0042] In the above-mentioned molten steel processing mechanism, the agitator coil 213 adopts a centralized winding 210, and the electromagnetic agitator 200 is a traveling wave agitator, which can form a large circulation with the ladle 100 on one side as an ascending flow stream and the wall of the ladle 100 on the other side as a descending flow stream, which can carry the alloy to the bottom of the ladle 100 faster, thereby shortening the stirring time required for the alloy.

[0043] In some embodiments, the windings 210 are evenly spaced, and the ratio of the length, width, and height of the windings 210 is (580-800): (250-400): (300-450); the ratio of the height of the windings 210 to the height of the ladle 100 is (200-400): (2500-4000). The height of the windings 210 corresponds to the height of the coil 213 of the stirrer.

[0044] In some embodiments, in any of the windings 210, there is an iron core seat 211 and an iron core body 212 disposed on the iron core seat 211, the iron core body 212 is disposed corresponding to the windings 210, and the windings 210 are respectively wound on the iron core body 212; the ratio of the height of the iron core seat 211 to the height of the iron core body 212 is 100:290. In a specific embodiment, all windings 210 share one iron core seat 211. That is, multiple iron core bodies 212 are disposed on one iron core seat 211. Each iron core body 212 is wound with one coil 213.

[0045] In some embodiments, the ratio of the height of the core seat 211 to the height of the core body 212 is 100:290.

[0046] The height of the core body 212 is the height of the coil 213 of the stirrer, and the height of the stirrer is the sum of the height of the core base 211 and the height of the core body 212. For example, the height of the core base 211 is 100 mm, and the height of the core body 212 is 290 mm.

[0047] In some embodiments, the number of turns of the coil 213 of the winding 210 is 90 to 110, and the diameter of the wire in the coil 213 is 8 to 18 mm.

[0048] Exemplarily, the number of turns of the coil 213 of the winding 210 is 100 turns.

[0049] In some embodiments, the blowing mechanism is connected to the blowing hole at the bottom of the ladle 100 , and the blowing hole is located at 1 / 2R-2 / 3R of the bottom of the ladle 100 , where R is the radius of the bottom of the ladle 100 .

[0050] In some embodiments, the bottom of the ladle 100 has a permeable brick, and the radius of the permeable brick is 0.08 to 0.12 meters.

[0051] The present application also discloses an alloy mixing method, which includes adding the alloy into molten steel from the slag eye of the molten steel and mixing the alloy using the molten steel processing mechanism described above.

[0052] "Slag eye" refers to the area of ​​the molten steel surface that is exposed and not covered by slag due to the stirring effect of gas (such as argon). The alloy should be added at the slag eye position, and there is no need to open additional slag eyes, thereby reducing the secondary oxidation of the molten steel. And adding alloy at the slag eye position can shorten the required mixing time.

[0053] The applicant described the electromagnetic force generated by the electromagnetic stirrer and calculated the coupling of the magnetic field to reduce the alloy mixing time. Specifically, by comparing the magnetic field distribution, flow field distribution, temperature field distribution and alloy mixing time in the ladle, the following conclusions were drawn: the use of the rotary electromagnetic stirrer mentioned in this patent can shorten the alloy mixing time compared with the control example without the rotary electromagnetic stirrer. Therefore, the rotary electromagnetic stirrer in this patent is very effective.

[0054] Each bubble entering the molten steel is tracked by the DPM model in FLUENT of ANSYS commercial simulation software. The bubble residence time is the difference between the time when the bubble overflows the molten steel and the time when the bubble enters the molten steel. At least 4,000 bubbles are collected as a sample library, and their arithmetic mean is taken as the average residence time. The calculation results show that the residence time of bubbles with different diameters increases.

[0055] Maxwell's equations are the basis for studying macroscopic electromagnetic problems and the basis for finite element analysis of electromagnetic problems. Therefore, the analysis of electromagnetic problems is actually solving Maxwell's equations under boundary conditions. Maxwell's equations consist of four laws: Gauss's flux law, Gauss's law, Faraday's law of electromagnetic induction, and Ampere's circuit law.

[0056] The current passing through the coil is a harmonic current, and the magnetic field generated is a harmonic magnetic field. The electromagnetic field formed by the electromagnetic stirrer satisfies the following simplified Maxwell equations:

[0057]

[0058] In the formula, H is the magnetic induction intensity, A / m; j is the current density, A / m2; t is the time, s; B is the magnetic induction intensity, T; E is the electromagnetic intensity, V / m.

[0059] The above results show that the electromagnetic fields at each point in space are interrelated. By solving differential equations, the electromagnetic field distribution of practical problems can be calculated. In practical applications, the influence of the medium on the magnetic field must be considered. For isotropic media:

[0060] B=μ 0 μ r H (5)

[0061] Where, μr is the relative magnetic permeability, dimensionless; μ0 is the vacuum magnetic permeability, 4π×10 -7 .

[0062] Calculation of electromagnetic force

[0063] The induced current in the molten steel in the electromagnetic field can be expressed as:

[0064] j=σ(E+u i ×B) (6)

[0065] Where σ is the conductivity, S / m.

[0066] The generated electromagnetic force can be expressed as:

[0067] F=j×B (7)

[0068] Combining formulas (3), (4), (5) and (7), we can get the following equation:

[0069]

[0070] In the formula, the first term on the right side of the formula is the magnetic convection term, and the second term is the magnetic diffusion term. The magnetic Reynolds number can be defined as:

[0071] Re m =u i Lσμ 0 μ r (9)

[0072] Where F is the electromagnetic force, N / m 3 ; L is the characteristic length of the molten pool, m. Usually when Re m >>1, the fluid flow has a greater impact on the magnetic field and cannot be ignored; m When <<1, the fluid flow has little effect on the magnetic field and can be ignored. The magnetic field frequency involved in this study is 10Hz (the magnetic field frequency is set in the simulation software, and the electromagnetic stirrer itself can adjust this parameter in the range of 0-20Hz) to meet Re m<<1. Therefore, in this study, the effect of fluid flow on the magnetic field is ignored. According to the Euler-Lagrange model, liquid steel is the continuous phase and argon is the discrete phase. Liquid steel is an incompressible fluid, and the continuity equation and momentum conservation equation of liquid steel are simplified as follows:

[0073]

[0074] In the formula, u i is the fluid velocity, m / s; ρ is the density of the molten steel, kg / m 3 ; P is pressure, Pa; μ e is the effective turbulent viscosity, μ t is the turbulent viscosity, kg / (m·s); μ is the viscosity of the molten steel, kg / (m·s); F lg，i is the interaction force between liquid and gas phase, N / m 3 ;x i and x j They represent the components of the vector in different directions.

[0075] Basic equation of temperature field transmission:

[0076]

[0077] In the formula, C p is the specific heat capacity of molten steel, J / (kg·K); λ is the thermal conductivity of molten steel, W / (m·K); T is the temperature of molten steel, K.

[0078] Basic equations for component transport:

[0079]

[0080] In the formula, C M is the alloy mass concentration, kg / m 3 ;D M is the turbulent diffusion coefficient, m 2 / s;S Ct is the Schmidt number, which takes a value of 0.7.

[0081] The turbulence is solved using the standard two-equation k-ε model:

[0082] Turbulent kinetic energy k equation:

[0083]

[0084] The turbulent kinetic energy dissipation rate ε equation:

[0085]

[0086] In the formula, C 1ε , C 2ε, C μ , σ k , σ ε is an empirical constant, and its values ​​are 1.44, 1.92, 0.09, 1.0, and 1.3 respectively; G k is the turbulent kinetic energy generated by the mean velocity gradient.

[0087] Therefore, the molten steel generates a rotational motion under the action of the rotating electromagnetic stirrer at the bottom of the ladle. The molten steel generates a rotational motion under the action of the rotating electromagnetic stirrer at the bottom of the ladle and makes the concentration deviation of each point inside the molten steel less than 5%.

[0088] In some embodiments, argon gas is introduced into the molten steel in the ladle through a blowing mechanism at a flow rate of 400-2000 L / min and a pressure of 0.3-1.3 MPa, and the electromagnetic stirrer is operated at an AC current intensity of 200A-400A.

[0089] Under this condition, the bubble residence time is greatly extended, and the stirring effect of the bubbles is fully utilized, so the stirring efficiency is greatly improved, thereby shortening the stirring time required for the alloy.

[0090] In some embodiments, argon gas is introduced into the molten steel in the ladle through a blowing mechanism at a flow rate of 400-2000 L / min and a pressure of 0.3-1.3 MPa, and the electromagnetic stirrer is operated at an AC current intensity of 200A-400A.

[0091] The technical solution of the present application is described below with a specific embodiment.

[0092] Example 1

[0093] The electromagnetic stirrer established in this patent belongs to a traveling wave stirrer. The stirrer coil adopts a centralized winding, and the structural dimensions of the stirrer are consistent with those shown in Table 1. The model structure of the ladle and the electromagnetic stirrer is as follows Figure 1 shown.

[0094] Table 1 Physical properties

[0095]

[0096] To facilitate calculation and simulation, the simulation is appropriately simplified and the following basic assumptions are made:

[0097] (1) Ignore the Joule heat generated by the electromagnetic stirrer;

[0098] (2) Ignoring the influence of slag, the molten steel is in direct contact with the atmosphere;

[0099] (3) Physical parameters such as density, viscosity, electrical conductivity and magnetic permeability of molten steel are constants.

[0100] (4) Ignore the effect of temperature gradient in molten steel on bubble diameter;

[0101] (5) The ladle is filled with stationary molten steel

[0102] Study on electromagnetic force distribution

[0103] Among them, the inventors studied the electromagnetic force distribution formed at the bottom of the molten steel under the conditions of the electromagnetic stirrer with a current intensity of 200A to 400A, a bottom blowing argon gas flow rate of 400l / min, and a pressure of 0.35Mpa.

[0104] Figure 2 The electromagnetic force distribution of the electromagnetic stirrer in the molten steel near the wall of the ladle. The electromagnetic force formed is consistent with the position of the stirrer. The stirrer will drive the molten steel at the bottom center to move along the negative direction of the X-axis.

[0105] Flow field distribution under the action of electromagnetic stirrer

[0106] The agitator is located at the bottom of the ladle near the argon blowing port, generating an electromagnetic force in the negative direction of the X-axis in the molten steel. The molten steel at the bottom is continuously accelerated by the electromagnetic force within the range of the agitator.

[0107] See also Figure 3 , Figure 3 This is the distribution diagram of the mainstream stocks of molten steel under the action of electromagnetic stirrer.

[0108] Temperature field distribution under the action of electromagnetic stirrer

[0109] Figure 4 The temperature field distribution diagram under the action of electromagnetic stirrer. The electromagnetic stirrer is located at the bottom of the ladle. The molten steel moves faster at the left side of the ladle wall, taking away a lot of heat, thus generating a low temperature area.

[0110] Alloy mixing time under electromagnetic stirrer

[0111] Figure 5 Figure 2 is a schematic diagram of the monitoring points of the ladle during central electromagnetic stirring. Table 2 shows the coordinates of the monitoring points, where the unit of the coordinates is meter.

[0112] Table 2 Coordinates of monitoring points

[0113]

[0114] Figure 6 The standardized concentration of alloys at each monitoring point of the molten steel under the electromagnetic stirrer changes with time. The alloy is added at the slag eye. As can be seen from the figure, the dimensionless alloy concentration at each monitoring point fluctuates up and down with time, and the alloy reaches basic mixing at 120s.

[0115] Comparative Example 1 Alloy mixing time without electromagnetic stirrer

[0116] Figure 7Figure 3 is a schematic diagram of the monitoring points of the ladle without electromagnetic stirring. Table 3 is the coordinates of the monitoring points, where the unit of the coordinates is meter.

[0117] Table 3 Coordinates of monitoring points

[0118]

[0119] Figure 8 The standardized concentration of alloy at each point in the molten steel is monitored over time without an electromagnetic stirrer. The alloy is added at the slag eye. Figure 8 It can be seen that the dimensionless alloy concentration at each monitoring point fluctuates up and down with time, and the alloy reaches basic mixing at 230s.

[0120] Figure 8 Alloy mixing time without electromagnetic stirrer

[0121] Comparative Example 2 Alloy mixing time under the side electromagnetic stirrer

[0122] The stirrer coil simulated in Example 2 adopts a concentrated winding, and the structural dimensions of the stirrer are consistent with those shown in Table 4. The model structure of the ladle and the electromagnetic stirrer is as follows: Fig. 9 As shown, the main difference from the embodiment is that the electromagnetic stirrer is arranged on the side of the ladle. Fig.10 is the alloy mixing time under the action of the side electromagnetic stirrer. The dimensionless alloy concentration at each monitoring point fluctuates up and down with time, and the alloy reaches basic mixing at 160s.

[0123] Table 4 Physical properties

[0124]

[0125] Fig.12 Figure 4 is a schematic diagram of the monitoring points of the ladle without electromagnetic stirring. Table 4 is the coordinates of the monitoring points, where the unit of the coordinates is meter.

[0126] Table 4 Coordinates of monitoring points

[0127]

[0128] Analysis example

[0129] This patent describes the electromagnetic force generated by the electromagnetic stirrer and couples the magnetic field with the flow field of the eccentric bottom-blown ladle for calculation. By comparing the magnetic field distribution, flow field distribution, temperature field distribution and alloy mixing time in the ladle, the following conclusions are drawn: the use of the rotary electromagnetic stirrer mentioned in this patent can shorten the alloy mixing time by 90s compared with Comparative Example 1 that does not use the rotary electromagnetic stirrer, and the bottom electromagnetic stirring can shorten the alloy mixing time by 40s compared with Comparative Example 2 with the side electromagnetic stirring. Therefore, the rotary electromagnetic stirrer in this patent is very effective.

[0130] The above technical solutions of the present invention are only preferred embodiments of the present invention, and the patent scope of the present invention is not limited thereto. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A molten steel treatment mechanism for reducing alloy mixing time, characterized in that: include: A ladle having a holding chamber for holding molten steel; An air blowing mechanism, connected to the accommodating cavity; An electromagnetic stirrer is arranged at the bottom of the outer wall of the ladle, and the electromagnetic stirrer includes a plurality of windings, which are arranged in a row and symmetrically distributed around the center of the ladle to form a winding part; The ratio of the length of the winding part to the bottom inner diameter of the ladle is 1120:(2540-2640); the number of the windings is 8-12.

2. The molten steel processing mechanism according to claim 1, characterized in that: The windings are evenly spaced, and the ratio of the length, width and height of the windings is (580-800): (250-400): (300-450); the ratio of the height of the windings to the height of the ladle is (200-400): (2500-4000).

3. The molten steel processing mechanism according to claim 1, characterized in that: In any of the windings, there is an iron core seat and an iron core body arranged on the iron core seat, the iron core body is arranged corresponding to the winding, and the windings are respectively wound on the iron core body; the ratio of the height of the iron core seat to the height of the iron core body is 100:

290.

4. The molten steel processing mechanism according to claim 3, characterized in that: The number of turns of the coil of the winding is 90 to 110, and the diameter of the wire in the coil is 8 to 18 mm.

5. The molten steel processing mechanism according to claim 3, characterized in that: The distance between the top of the winding and the outer side of the bottom of the ladle is 8 to 12 mm.

6. The molten steel processing mechanism according to claim 1, characterized in that: The blowing mechanism is connected to the blowing hole at the bottom of the ladle, and the blowing hole is located at 1 / 2R-2 / 3R of the bottom of the ladle, where R is the radius of the bottom of the ladle.

7. The molten steel processing mechanism according to claim 1, characterized in that: The bottom of the ladle is provided with air-permeable bricks, and the radius of the air-permeable bricks is 0.08 to 0.12 meters.

8. An alloy mixing method, characterized in that: The alloy is added into the molten steel from the slag eye of the molten steel, and mixed using the molten steel treatment mechanism described in any one of claims 1 to 7.

9. The alloy mixing method according to claim 8, characterized in that: Argon gas is introduced into the molten steel in the ladle at a flow rate of 400-2000 L / min and a pressure of 0.3-1.3 MPa through a blowing mechanism, and an electromagnetic stirrer is operated at an AC current intensity of 200A-400A.

10. The alloy mixing method according to claim 9, characterized in that: The argon gas is introduced into the molten steel in the ladle at a flow rate of 600-1000 L / min and a pressure of 0.45-07 MPa, and the electromagnetic stirrer is operated at a current intensity of 200A-400A.

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