Method for compositely stirring and melting iron material

Abstract

The invention discloses a method for compositely stirring and melting iron materials, and belongs to the field of electric furnace metallurgy in ferrous metallurgy. Specifically, firstly, a bottom blowing stirring device of the electric furnace is arranged, and the mounting angle of a stirring head base body and a lower base plate is changed; meanwhile, a furnace wall oxygen lance or a burner or a carbon spraying gun side blowing device of the electric furnace is arranged, and the installation angles of the water cooling base body and the rear base plate in the horizontal direction are changed, so that the molten steel and the slag form rotating circulation. Aiming at solid iron materials, the shape and the number of the charging articulated chutes are changed, so that the direction of adding the solid iron materials into molten steel is changed to impact a molten pool, and the molten steel and slag form rotating circulation. When the electrodes of the electric furnace are heated, an electromagnetic field of direct current or alternating current generates Lorentz force, so that molten steel and slag in a molten pool form rotating circulation. And finally, the rotating directions of four kinds of circulation formed by bottom blowing, side blowing, solid iron material flow and electromagnetic stirring are kept consistent, and under the heating action of electrodes, composite stirring and solid iron material melting are strengthened, so that the problem of iron material bonding is solved.

Description

Technical Field

[0001] The invention belongs to the field of electric furnace metallurgy in iron and steel metallurgy, and in particular relates to a method for composite stirring and melting iron materials. Background Art

[0002] The short-process electric arc furnace steelmaking has the advantages of short process, recyclable resources and low energy consumption. The carbon emissions per ton of steel are much lower than those of the long process. It is a priority development direction. The short-process electric arc furnace steelmaking uses scrap steel as the main raw material and is an important process in the recycling of steel. However, the current scrap steel supply is relatively insufficient, and there are problems such as uncontrollable quality composition and enrichment of impurity elements.

[0003] Many electric furnaces use scrap steel and some solid iron materials for smelting; solid iron materials include pig iron blocks, sponge iron, modified iron blocks, direct reduced iron, small pieces of scrap steel, and iron-containing pellets, etc. These iron-containing materials can be added through the material basket or the scrap steel preheating channel, or they can be transported to the high-level material bin and finally enter the electric furnace molten pool through the charging chute. During the electric furnace smelting process, the melting time of solid furnace materials accounts for 60% of the electric furnace smelting cycle, which is the key to affecting the electric furnace smelting cycle and energy consumption.

[0004] The molten pool of an electric furnace is shallow and dish-shaped, with a large surface area, which causes more heat to be lost through radiation and convection, thereby reducing the melting efficiency. In a shallow molten pool, the flow of liquid metal is not as stable as in a deep molten pool, resulting in poor blowing or electromagnetic stirring effects, which can easily cause uneven melting of iron-containing materials.

[0005] Since the three-phase electrodes of the electric furnace will produce cold zones and hot zones, these iron-containing materials cannot be melted in time and are easily stuck together and hung on the furnace wall, seriously deteriorating the smelting conditions, increasing energy consumption and smelting time, and affecting the normal process of the electric furnace.

[0006] In order to solve the problem of smooth smelting of solid iron materials, it is necessary to adopt methods such as composite stirring.

[0007] Compound stirring refers to the combination of multiple stirring methods to increase the melting and reaction rate of solid iron materials during the smelting process. Electric furnaces usually use bottom blowing, side blowing and other methods to introduce gas into the molten pool to promote material melting, chemical reaction and temperature uniformity. Some also add electromagnetic stirring devices at the bottom or around the furnace to stir the molten steel using electromagnetic force.

[0008] These methods often only focus on the use of one method or the superposition of two methods, and do not use the impact kinetic energy of the material itself. The bonding phenomenon of solid iron materials is still very serious, which prolongs the smelting time. Therefore, it is very necessary to combine more than three types of multiple composite stirring and make full use of horizontal rotation stirring, which is more important than vertical stirring of the molten pool. Summary of the invention

[0009] In view of the above problems, the present invention proposes a method for composite stirring and melting iron materials, in which composite stirring is carried out to melt solid iron materials in an electric furnace, and four types of rotating circulations formed by bottom blowing, side blowing, electromagnetic stirring and solid iron material flow are superimposed on each other, thereby greatly enhancing the convective migration and heat transfer melting effects of the solid iron materials, greatly reducing or even eliminating the agglomeration and bonding phenomenon of the solid iron materials, and ensuring the smooth process of electric furnace smelting.

[0010] The method for composite stirring and melting iron material comprises the following specific steps:

[0011] Step 1: Arrange the bottom blowing stirring device of the electric furnace so that the molten steel and slag in the molten pool form a clockwise or counterclockwise rotating circulation.

[0012] The bottom blowing stirring device is installed at the bottom of the electric furnace and consists of a stirring head base and a lower base plate. The installation angle of the stirring head base and the lower base plate is set to 60°~87°, so that the bottom blowing center line and the vertical line of the molten pool form a corresponding angle. The gas flow beam blown out by the stirring head base deviates from the vertical line of the melt by 3°~30°, causing the melt flow to rotate.

[0013] In this way, if more than two bottom blowing stirring devices are arranged at the bottom of the furnace, the gas flow will cause the molten pool to move, forming a clockwise or counterclockwise rotating circulation.

[0014] The formation of the rotating circulation relies on the horizontal dynamic component of the gas entering the molten steel to do work, and the specific calculation formula is as follows:

[0015] W = nRT / (P g +ρ l gH)*(0.5*ρ g *usinθ*usinθ)

[0016] Where W is the gas power work, n is the number of moles of gas, R is the gas constant, T is the outlet temperature of the injected gas, P g is the outlet pressure of the gas, H is the height of the molten steel, ρ l and ρ g are the liquid and gas densities, g is the gravitational acceleration, u is the gas velocity at the outlet, and θ is the angle between the bottom blowing center line and the vertical line of the molten pool.

[0017] Step 2: Arrange the side blowing device of oxygen lance, burner or carbon spray gun on the furnace wall of the electric furnace to make the molten steel and slag form a clockwise or counterclockwise rotating circulation.

[0018] The furnace wall oxygen gun or burner device consists of a base and a gun body arranged on the base. The base is welded by a water-cooled base and a rear base plate. The installation angle of the water-cooled base and the rear base plate in the horizontal direction is set to 45° to 85°, and the installation angle of the water-cooled base and the rear base plate in the vertical direction is set to 30° to 60°.

[0019] When the gun body deviates by 5° to 45° in the horizontal direction, the impact point of the jet beam emitted from the gun body deviates by 5° to 45° from the center of the molten pool and approaches the edge of the molten pool.

[0020] More than two furnace wall oxygen lances are arranged on the water-cooled plate, and the jet beam impacts the molten pool to make the molten pool move and form a rotating circulation.

[0021] The carbon spray gun device consists of a carbon spray tube and a base, and the base is welded by a water-cooled base and a rear base plate; the angle arrangement and change method of the carbon spray gun device are the same as those of the furnace wall oxygen gun or burner device.

[0022] Likewise, two or more carbon spray guns are arranged on the water cooling plate, and the jet beam carrying carbon powder causes the molten pool to move to form a rotating circulation.

[0023] Since the furnace wall oxygen gun or burner device, as well as the carbon spray gun device, only the installation angle of the water-cooled base and the rear base plate in the horizontal direction is changed, the flow rate and pressure of the side-blowing gas are calculated by W = ηnRT / (P g +ρ l gH)*(0.5*ρ g *usinθ*usinθ), η is the efficiency of the side-blowing gas, and θ is the angle between the impact point of the jet beam emitted by the gun body and the center of the molten pool.

[0024] Step 3: For solid iron materials, change the shape and number of the feeding chute, and then change the direction in which the solid iron materials are added into the molten steel to impact the molten pool, so that the molten steel and slag form a clockwise or counterclockwise rotating circulation.

[0025] A lifting mechanism is used to change the charging chute into a retractable type, and the number is increased to two, which are arranged symmetrically on the furnace cover; at the same time, the angle of the charging chute is controlled at 30°~60°. After the charging chute is extended into the furnace cover, the material impacts the molten pool, so that the molten steel and slag form a rotating circulation.

[0026] Step 4: When the electrodes of the electric furnace are heated, the electromagnetic field of DC or AC generates Lorentz force, causing the molten steel and slag in the molten pool to form a clockwise or counterclockwise rotating circulation.

[0027] A DC furnace can change the direction of the rotating circulation clockwise or counterclockwise by changing the polarity, while an AC furnace can change the phase.

[0028] Step 5: Keep the rotation directions of the four types of circulations formed by the bottom blowing, side blowing, solid iron material flow and electromagnetic stirring of the electric furnace consistent. Under the action of electrode heating, strengthen the composite stirring and melting of solid iron materials to solve the problem of iron material adhesion.

[0029] The advantages of the present invention are:

[0030] A composite stirring method for melting iron materials, through reasonable equipment layout and assembly, makes the rotation direction of four circulation flows consistent, thereby greatly strengthening the composite stirring effect. When solid iron materials are added into the furnace, under the enhanced composite stirring effect, convection migration and heat transfer melting are greatly accelerated, reducing or even eliminating the agglomeration and bonding phenomenon of solid iron materials, ensuring the smooth progress of the electric furnace smelting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a flow chart of a method for composite stirring and melting iron material according to the present invention;

[0032] Figure 2 This is an example diagram of the improved equipment structure in the method for composite stirring and melting iron materials of the present invention;

[0033] Figure 3 It is an enlarged view of the bottom blowing device in the composite stirring and melting iron material equipment of the present invention;

[0034] Figure 4 It is a rotation comparison diagram of the side blowing device in the composite stirring and melting iron material equipment of the present invention.

[0035] Among them, 1-feeding chute; 2-furnace wall oxygen gun; 3-bottom blowing device; 4-electrode; 5-electric furnace wall. DETAILED DESCRIPTION

[0036] In order to facilitate those skilled in the art to understand and implement the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only partial embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present invention.

[0037] The present invention provides a method for composite stirring and melting iron material, such as Figure 1 As shown, the specific steps are as follows:

[0038] Step 1: Arrange the bottom blowing stirring device of the electric furnace so that the molten steel and slag in the molten pool form a clockwise or counterclockwise rotating circulation.

[0039] The bottom blowing stirring device is generally composed of a stirring head base and a lower base plate, and is installed at the bottom of the electric furnace. Usually, the stirring head base is perpendicular to the lower base plate, that is, the angle between the two is 90°. The present invention changes the angle range between the stirring head base and the lower base plate to 60° to 87°, so that the bottom blowing center line and the vertical line of the molten pool form a certain angle. In this way, after the bottom blowing stirring device is installed at the bottom of the electric furnace, the gas flow blown out from the stirring head base is no longer perpendicular to the melt, but deviates from the range of 3° to 30°, causing the melt flow to rotate.

[0040] In this way, if more than two bottom blowing stirring devices are arranged at the bottom of the furnace, the gas flow will cause the molten pool to move, forming a clockwise or counterclockwise rotating circulation.

[0041] As is known to all, when gas is blown into molten steel at a certain pressure and flow rate, the work done by the gas on the molten steel includes buoyancy work, expansion work, static pressure work and dynamic work. The first three works are mainly consumed in the vertical direction of the liquid and will not form a horizontal rotating circulation. The present invention hopes that the circulation formed in the horizontal direction mainly relies on the horizontal dynamic component of the gas entering the molten steel to do work. The formula to characterize this phenomenon is:

[0042] W = nRT / (P g +ρ l gH)*(0.5*ρ g *usinθ*usinθ)

[0043] Where W is the gas kinetic work. Where n is the number of moles of gas, R is the gas constant 8.314 J / (mol·K), T is the outlet temperature of the injected gas in Kelvin (K), and P is g is the outlet pressure of the gas in Pascal (Pa), H is the height of the molten steel in meters (m), ρ l and ρ g is the density of liquid and gas in kilograms per cubic meter (kg / m3), g is the acceleration of gravity, u is the gas velocity at the outlet in meters per second (m / s), and θ is the angle between the bottom blowing center line and the vertical line of the molten pool.

[0044] Example 1:

[0045] When the bottom blowing gas drives the molten steel, take 1m 3 The corresponding mole number of gas, the gas outlet temperature is 1873K, and the gas outlet pressure is 1.01*10 5 Pa, molten steel height 1m, liquid and gas density 7000kg / m 3 and 0.29kg / m 3 , the gas velocity at the outlet is 1m / s, and the angle θ between the center line and the vertical line is 30°. 3 The horizontal power generated by the gas is about 0.15J, pushing 1000kg of molten steel at a speed of about 0.02m / s. This can drive the molten steel to perform a slow circular motion in the horizontal direction. According to the formula, the appropriate flow rate and pressure of the bottom blowing gas can be calculated to drive the molten steel to perform appropriate motion.

[0046] Step 2: Arrange the oxygen lance, burner or carbon spray gun device on the furnace wall of the electric furnace to make the molten steel and slag form a clockwise or counterclockwise rotating circulation.

[0047] The furnace wall oxygen lance or burner device consists of a lance body and a base. The base is welded by a water-cooled base and a rear base plate.

[0048] Usually, the water-cooled substrate is perpendicular to the rear substrate in the horizontal direction, that is, the angle between the two is 90°; in the vertical direction, the angle between the water-cooled substrate and the rear substrate is set to 30° to 60°. The present invention changes the angle between the water-cooled substrate and the rear substrate in the horizontal direction to 45° to 85°, and the angle between the water-cooled substrate and the rear substrate in the vertical direction remains unchanged. In this way, after the gun body is arranged inside the base, the gun body deviates by 5° to 45° in the horizontal direction, and the impact point of the jet beam emitted from the gun body is no longer aimed at the center of the molten pool, but deviates by 5° to 45° to the edge of the molten pool.

[0049] In this way, more than two furnace wall oxygen lances are arranged on the water-cooled plate, and the jet beam impacting the molten pool will cause the molten pool to move and form a rotating circulation.

[0050] The carbon spray gun device is similar to the furnace wall oxygen gun or burner device, and is composed of a carbon spray tube and a base, and the base is welded by a water-cooled base and a rear base plate. The angle arrangement and change method of the carbon spray gun device are the same as those of the furnace wall oxygen gun or burner device, so it will not be repeated.

[0051] Similarly, if more than two carbon spray guns are arranged on the water cooling plate, the jet beam carrying carbon powder will also make the molten pool move to form a rotating circulation. Since they are all arranged on the furnace wall, they are collectively called side blowing.

[0052] Furthermore, when the furnace door oxygen lance blows the molten pool on one side of the furnace door, it can also help form a rotating circulation.

[0053] Since the furnace wall oxygen lance or burner device, as well as the carbon spray gun device, only the installation angle of the water-cooled base and the rear base plate in the horizontal direction is changed, the horizontal component of the work done by the side-blowing gas on the molten steel is calculated by the following formula:

[0054] W = ηnRT / (P g +ρ l gH)*(0.5*ρ g *usinθ*usinθ)

[0055] The difference from the bottom blowing formula is that η is the efficiency of the side blowing gas (because a considerable part of the side blowing gas diffuses to the surface of the molten steel, it will react chemically with the molten steel, thereby weakening the impact kinetic energy), which is usually between 0.01 and 0.2, and θ is the angle between the impact point of the jet beam emitted by the gun body and the center of the molten pool.

[0056] The horizontal component of the work done by the side-blowing gas on the molten steel is calculated with reference to this formula. Since the pressure and flow rate of the side-blowing gas are many times greater than those of the bottom-blowing gas, it can drive the molten steel to move horizontally faster, with a speed of more than 10 times that of bottom blowing.

[0057] Example 2:

[0058] When the side-blowing gas drives the molten steel, take 1m 3 The corresponding mole number of gas, the gas outlet temperature is 298K, and the gas outlet pressure is 1.01*10 5 Pa, molten steel height 1m, liquid and gas density 7000kg / m 3 and 1.43kg / m 3 , the gas velocity at the outlet is 50m / s, the angle θ between the center line and the vertical line is 30°, and the efficiency η of the side-blowing gas is 0.1. 3 The horizontal power work generated by the gas is 29 J, pushing 1000 kg of molten steel to produce a speed of 0.24 m / s. This can drive the molten steel to move horizontally faster and promote the formation of horizontal rotating circulation.

[0059] Step 3: For solid iron materials, change the shape and number of the feeding chute, and then change the direction in which the solid iron materials are added into the molten steel to impact the molten pool, so that the molten steel and slag form a clockwise or counterclockwise rotating circulation.

[0060] Usually, a feeding chute is equipped on the furnace cover of the electric furnace. The raw materials are transported from the top to the chute by a vibrating feeder. There is a baffle to control the feeding speed and flow rate. The angle of the feeding chute entering the furnace cover is usually close to 90°, so that the materials fall vertically into the furnace.

[0061] The present invention adopts a lifting mechanism to change the feeding chute into a telescopic type, and the number is increased to two, which are symmetrically arranged on the furnace cover. The angle of the feeding chute is controlled at 30° to 60°. After the feeding chute is extended into the furnace cover, the material direction impacts the molten pool, so that the molten steel and slag form a rotating circulation.

[0062] Step 4: When the electrodes of the electric furnace are heated, the electromagnetic field of DC or AC generates Lorentz force, causing the molten steel and slag in the molten pool to form a clockwise or counterclockwise rotating circulation.

[0063] An electric furnace is a device that uses direct current or alternating current to generate an arc high temperature zone to melt and smelt metals. The electromagnetic field of direct current or alternating current acts on the conductive molten steel, generating a Lorentz force that causes the molten steel to rotate and form eddy currents. This effect is called electromagnetic stirring.

[0064] The magnetic field generated by the electrodes of the DC furnace acts on the molten steel, and the rotational force generated by the interaction between the eddy current and the magnetic field drives the molten steel to rotate; since the conduction direction of DC is fixed, the eddy current generated is stable and powerful; although the magnetic field generated by three-phase AC is alternating, the direction of the eddy current movement is also stable after the magnetic fields are superimposed on the molten steel. For electric furnaces of the same power, the electromagnetic stirring effect of the molten steel in the DC furnace will be more powerful than that in the AC furnace.

[0065] A DC furnace can change the direction of the rotating circulation clockwise or counterclockwise by changing the polarity, while an AC furnace can change the phase.

[0066] The electromagnetic stirring force and the density and flow characteristics of the molten steel are used to estimate the flow rate of the molten steel. The following formula can be used:

[0067] v = kBIL*t / m.

[0068] In the formula, B represents the magnetic field intensity generated by the current, in Tesla (T); I represents the current, in ampere (A); L represents the distance from the current to the molten steel, in meter (m); BIL is the electromagnetic stirring force on the molten steel, in Newton (N); t is the flow time of the molten steel, in seconds (s); m is the mass of the molten steel, in kilograms (kg); k is a coefficient determined by the specific electrode shape.

[0069] Example 3:

[0070] When the electromagnetic field drives the molten steel, the magnetic field strength generated by the electrode arc is 0.1T, the current is 10000A, the distance from the current to the molten steel is 1m, the mass of the molten steel is 1000kg, the flow time of the molten steel is 1s, and the coefficient k is 0.1. It is estimated that the flow rate of the molten steel driven by the electromagnetic stirring force at 1m is 0.10m / s, which can promote the formation of horizontal rotating circulation of the molten steel.

[0071] Step 5: Keep the rotation directions of the four types of circulations formed by bottom blowing, side blowing, solid iron material flow and electromagnetic stirring consistent. Under the action of electrode heating, strengthen the composite stirring and melt the solid iron material to solve the problem of iron material adhesion.

[0072] like Figure 3 As shown, install the bottom blowing stirring device of the electric furnace and adjust the gas path to make the circulation normal; Figure 4 As shown, install the furnace wall oxygen gun or burner or carbon spray gun device, and adjust it to make the circulation normal; adjust the telescopic feeding chute so that the solid iron material can be added into the furnace along the two feeding chute; energize the electrode to heat the furnace charge to ensure that the circulation direction of the electromagnetic stirring is consistent. Through reasonable equipment layout and assembly, when the solid iron material is added into the furnace, the rotation direction of these four circulation flows is consistent, such as Figure 2 This greatly strengthens the composite stirring effect, allowing the added solid iron material to move and melt rapidly under the combined action of the rotating flow and electrode heating, greatly reducing or even eliminating the agglomeration and bonding phenomenon of the solid iron material.

[0073] It should be noted that those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the implementation methods of the present invention, and it should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations that do not deviate from the essence of the present invention based on the technical revelations disclosed in the present invention, and these variations and combinations are still within the protection scope of the present invention.

Claims

1. A method for composite stirring and melting iron material, characterized in that: The specific steps are as follows: I) Arrange a bottom blowing stirring device of the electric furnace at the bottom of the electric furnace, set the installation angle of the stirring head base and the lower base plate to 60°~87°, so that the bottom blowing center line and the vertical line of the molten pool form a corresponding angle, and the gas flow beam blown out of the stirring head base deviates from the vertical line of the melt by 3°~30°, so that the molten steel and slag in the molten pool form a clockwise or counterclockwise rotating circulation; II) Arrange the furnace wall oxygen gun or burner or carbon spray gun device on the side wall of the electric furnace: The base of the furnace wall oxygen gun or burner device is welded by a water-cooled base and a rear base plate, and the installation angle of the water-cooled base and the rear base plate in the horizontal direction is set to 45° to 85°, and the installation angle of the water-cooled base and the rear base plate in the vertical direction is set to 30° to 60°; III) For solid iron materials, the shape and number of the feeding chute are changed, and then the direction in which the solid iron materials are added into the molten steel is changed to impact the molten pool, so that the molten steel and slag form a clockwise or counterclockwise rotating circulation; IV) When the electrodes of the electric furnace are heated, the electromagnetic field of DC or AC generates Lorentz force, causing the molten steel and slag in the molten pool to form a clockwise or counterclockwise rotating circulation; The direction of the rotating circulation can be reversed clockwise or counterclockwise by changing the polarity of a DC furnace and the phase of an AC furnace; V) Keep the rotation directions of the four types of circulation formed by bottom blowing, side blowing, solid iron material flow and electromagnetic stirring consistent. Under the action of electrode heating, strengthen the composite stirring and melting of solid iron material to solve the problem of iron material adhesion.

2. A method for composite stirring and melting iron material as claimed in claim 1, characterized in that: At least two bottom-blowing stirring devices are arranged at the bottom of the electric furnace, and the gas stream moves the molten pool, so that the molten steel and slag form a clockwise or counterclockwise rotating circulation; The formation of the rotating circulation relies on the horizontal dynamic component of the gas entering the molten steel to do work, and the specific calculation formula is as follows: W=nRT / (P g +r l gH)*(0.5*ρ g *usinθ*usinθ) Where W is the gas power work, n is the number of moles of gas, R is the gas constant, T is the outlet temperature of the injected gas, P g is the outlet pressure of the gas, H is the height of the molten steel, ρ l and ρ g are the liquid and gas densities, g is the gravitational acceleration, u is the gas velocity at the outlet, and θ is the angle between the bottom blowing center line and the vertical line of the molten pool.

3. A method for composite stirring and melting iron material as claimed in claim 1, characterized in that: The gun body of the furnace wall oxygen gun or burner device deviates by 5° to 45° in the horizontal direction, causing the impact point of the jet beam emitted from the gun body to deviate by 5° to 45° from the center of the molten pool and approach the edge of the molten pool; More than two furnace wall oxygen lances or burner devices are arranged on the water-cooled plate, and the jet beam impacts the molten pool to make the molten pool move to form a rotating circulation.

4. A method for composite stirring and melting iron material as claimed in claim 1, characterized in that: The carbon spray gun device is composed of a carbon spray tube and a base, and the base is welded by a water-cooled base and a rear base plate; the angle arrangement and change method of the carbon spray gun device are the same as those of the furnace wall oxygen gun or burner device; Likewise, two or more carbon spray guns are arranged on the water cooling plate, and the jet beam carrying carbon powder causes the molten pool to move to form a rotating circulation.

5. A method for composite stirring and melting iron material as claimed in claim 3 or 4, characterized in that: Since the furnace wall oxygen gun or burner device or carbon spray gun device only changes the installation angle of the water-cooled base and the rear base plate in the horizontal direction, the flow rate and pressure of the side-blowing gas are calculated by the following formula: W=ηnRT / (P g +r l gH)*(0.5*ρ g *usinθ*usinθ) η is the efficiency of the side-blowing gas, and θ is the angle between the impact point of the jet beam emitted by the gun body and the center of the molten pool.

6. A method for composite stirring and melting iron material as claimed in claim 1, characterized in that: In the step III), a lifting mechanism is used to change the feeding chute into a retractable type, and the number is increased to two, which are symmetrically arranged on the furnace cover; at the same time, the angle of the feeding chute is controlled at 30° to 60°. After the feeding chute is extended into the furnace cover, the material impacts the molten pool, so that the molten steel and slag form a rotating circulation.

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