WO2017099285A1 - Molten metal processing device and molten metal processing method - Google Patents

Abstract

A molten metal processing device according to the present invention comprises a refining agent feeder: provided so as to penetrate the side wall of a container in the diameter direction of the container; provided so as to be positioned higher than the bath surface height of molten metal before an impeller is immersed in the molten metal in the container and lower than the bath surface height of the uppermost part of the molten metal when the impeller is immersed and rotates in the molten metal in the container; and having a nozzle for blowing, into the container, a refining agent for refining the molten metal. Therefore, according to an embodiment of the present invention, refining efficiency is improved in comparison to when the refining agent is fed from the upper side of a container as in a conventional method, thereby enabling use of the refining agent and refining time to be reduced.

Description

Molten iron processing apparatus and molten iron processing method

The present invention relates to a molten iron treatment apparatus and a molten iron treatment method, and more particularly, to a molten iron treatment apparatus and a molten iron treatment method that can increase the reaction efficiency of the desulfurization agent.

The molten iron produced through the blast furnace process is refined to adjust the content of some of the molten iron to obtain the molten steel and the product of the final desired component. Typically, after the refinement to adjust the sulfur (S), phosphorus (P) contained in the molten iron below a predetermined level is charged in the converter, in the converter, after controlling the components and temperature such as C, P by oxygen blowing, Through secondary refining, additional component adjustments are made.

Here, in the case of sulfur (S), in the case of general steel except for high-cutting steel, such as steel that maintains the high content of sulfur (S), it is adjusted to a concentration of sulfur (S) of 0.01% by weight or less through the desulfurization step of the molten iron. In recent years, the S standard is very low, and in the desulfurization stage of the pretreatment, it is usually desulfurized to 0.003% or less.

As a method of desulfurizing molten iron, a mechanical stirring method having a relatively high desulfurization efficiency is used. The mechanical stirring method is a method of desulfurizing through a reaction between molten steel and a desulfurizing agent by adding a desulfurizer while depositing and rotating a stirring device called an impeller in a vessel containing molten iron.

A representative method of the desulfurization method using a mechanical stirring method is a method using a KAL facility (KR; Kanvara reactor). The KAL facility includes a ladle in which molten steel is accommodated, an impeller that is immersed and rotated in molten steel, and an injector for injecting a desulfurization agent into the ladle and positioned above the ladle. According to the KAL facility, when the desulfurizing agent is introduced from the upper side of the ladle through the injector, and the impeller is rotated, the desulfurizing agent reacts with the stirring molten iron to become sulfur (S) in the molten iron.

On the other hand, in order to increase the desulfurization efficiency, a solid powder or fine powder desulfurization agent is generally used. CaS, a desulfurization reaction product, is formed to a thickness of about 10 to 20 μm on the surface of the solid fine powder desulfurization agent. additional

It is produced and reacts that the desulfurization reaction proceeds. That is, CaS surrounds the surface of the solid fine powder desulfurization agent, thereby preventing the reaction of CaO and sulfur (S) in the molten iron. In addition, the desulfurization agent particles agglomerate, and the desulfurization agent is added to form agglomerates of several mm within a few minutes, and CaS is formed on the surface of the agglomerates so that the desulfurization efficiency drops to 5 to 10%.

In order to increase the reaction efficiency of the desulfurization agent, Korean Laid-Open Patent No. 2013-0024195 suggested a method of improving the desulfurization efficiency by installing a dispersion hole in the impeller blades to promote the dispersion of the desulfurization agent, but the impeller becomes structurally vulnerable, and thus frequent equipment replacement is required. There is a problem that is needed.

The present invention provides a molten iron treatment apparatus and a molten iron treatment method capable of increasing the reaction efficiency of the desulfurization agent.

The present invention provides a molten iron treatment apparatus and a molten metal treatment method which can reduce the amount of desulfurization agent used and the desulfurization time.

The molten iron processing apparatus which concerns on this invention is a container which can take the molten iron | metal; And an stirrer rotatable into the vessel, the impeller being immersed in the molten iron in the vessel to stir the molten iron; It is installed so as to penetrate the side wall of the container in the radial direction of the container, when the impeller is in the state before the impeller is immersed in the container, it is higher than the height of the water surface of the molten iron, the impeller is immersed in the molten iron in the container And a refiner injector, which is installed so as to be positioned lower than the hot water level of the uppermost portion of the molten iron and has a nozzle for injecting a refining agent for refining the molten iron into the vessel.

The refining agent injector, the refining agent storage unit the refining agent is stored;

A refiner supply line having one end connected to the refiner reservoir and the other end connected to the nozzle; And a gas supply line connected to the refining agent supply line and supplying an inert gas for movement of the refining agent.

The nozzle is installed to be perpendicular to the extension line extending in the width direction of the container in contact with the outer surface of the container.

The nozzle is inclined so that the angle formed by the extension line extending in the width direction of the container in contact with the nozzle and the outer surface of the container is an obtuse angle or an acute angle.

The nozzle is installed to be inclined in the rotational direction or the opposite direction of the impeller.

The nozzle has an upward separation distance of 10 cm or more from an upper surface of the molten iron in the state before the impeller is immersed in the molten iron in the vessel, and the molten iron in the state in which the impeller is immersed and rotated in the molten iron in the vessel. It is positioned and installed so that the downward distance from the uppermost surface is 15 cm or more.

The nozzles are provided in plural numbers and face each other.

The molten iron processing apparatus is a KAR apparatus (KR; Kanvara reactor), and the refining agent is a desulfurizing agent for removing sulfur (S) in the molten iron.

The molten iron processing method according to the present invention comprises the steps of taking molten iron in the container; A step of immersing the impeller by the molten iron in the vessel, the stirring of the molten iron by a rotation operation; A step of injecting a refining agent in the inward direction from the side wall of the vessel; Including a refining agent in the inward direction from the side wall of the vessel In the above state, when the impeller is in the vessel before the impeller is immersed, the height of the molten iron is higher than the molten iron of the vessel, when the impeller is immersed in the vessel of the vessel is rotated, at the top of the molten iron of the molten iron The refining agent is added at a lower position.

In injecting a refining agent inward from the side wall of the container, an inert gas is blown together with the refining agent to move the refining agent into the receptacle.

In the refining agent in the inward direction from the side wall of the container,

An upper distance from the upper surface of the molten iron in the state before the impeller is immersed by the molten iron in the vessel is 10 cm or more, and the uppermost surface of the molten iron in the state in which the impeller is immersed and rotated by the molten iron in the vessel; The refining agent is added at a position of 15 cm or more in a downward distance from the lower side.

In injecting the refining agent in the inward direction from the side wall of the container, the refining agent is discharged through the nozzle provided to be perpendicular to the extension line extending in the width direction of the container in contact with the outer surface of the container.

In the refining agent in the inward direction from the side wall of the container, the refining agent is installed on the side wall of the container, the angle formed by the extension line extending in the width direction of the container in contact with the outer surface of the container is inclined at an obtuse angle or an acute angle It is injected through the installed nozzle.

In injecting the refining agent in the inward direction from the side wall of the container, the nozzle is installed to be inclined in the direction of rotation or in the opposite direction of the impeller, to inject the refining agent in a direction corresponding to the direction of rotation of the impeller or in the opposite direction.

And injecting the refining agent from the upper side of the container before injecting the refining agent in the inward direction from the side wall of the container.

Refining the refining agent from the upper side of the vessel until 10% or less after the start of refining of the molten iron when the refining time of the refining is 100% with respect to the total time of refining the molten iron by injecting the refining agent into the molten iron. The refining agent is added in the inward direction from the side wall of the container from the time point exceeding 10%.

The refining agent removes sulfur (S) in the molten iron.

According to embodiment of this invention, it penetrates the side wall of a container, and is high compared with the molten metal height of the molten iron in the air | atmosphere state before stirring of an impeller, and compared with the upper-most molten metal height when the impeller is rotating at the maximum speed. A nozzle is installed in a low position, and a refiner is thrown in. Thus, as the refining efficiency is improved as compared to when the refining agent is added from the upper side of the container as in the prior art, the use of the refining agent and the refining time can be reduced.

1 is a view for explaining a molten iron processing apparatus according to an embodiment of the present invention.

2 is a top view of the molten iron processing apparatus showing the installation state of the nozzle according to an embodiment of the present invention.

3 is a top view of the molten iron processing apparatus showing the installation state of the nozzle according to the first modification of the embodiment;

4 is a top view of the molten iron processing apparatus showing the installation state of the nozzle according to the second modification of the embodiment;

5 is a conceptual diagram for explaining the timing of adding the desulfurization agent

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention in more detail. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the embodiments are intended to complete the disclosure of the present invention, and to those skilled in the art to fully understand the scope of the invention. It is provided to inform you. BRIEF DESCRIPTION OF THE DRAWINGS The drawings of the embodiments are exaggerated for explanation, and like reference numerals refer to like elements in the drawings.

1 is a view for explaining a molten iron processing apparatus according to an embodiment of the present invention. Here, Figure 1a is a state before the impeller of the agitator is immersed in the molten iron, Figure 1b shows a state in which the impeller is immersed in the molten iron. 2 is a top view of the molten iron processing apparatus showing the installation state of the nozzle according to an embodiment of the present invention. 3 is a top view of the molten iron processing apparatus showing the installation state of the nozzle according to the first modification of the embodiment. 4 is a top view of the molten iron processing apparatus showing the installation state of the nozzle according to the second modification of the embodiment. 5 is a conceptual diagram for explaining the timing of adding the desulfurization agent.

Referring to Figure 1, the molten iron processing apparatus according to an embodiment of the present invention is a vessel (L) containing the molten iron (M) for refining, the stirrer 200 to be immersed in the vessel (L), the molten iron ( M) Higher than the height of the molten iron M before the stirring, and inserted into the side wall of the container L at a lower position than the top height of the molten iron M when stirring the molten iron using the stirrer 200. And a refiner feeder 100 having a nozzle 110 for injecting the refiner into the molten iron.

Hereinafter, in describing the molten iron treatment apparatus and the molten iron treatment method according to an embodiment of the present invention, a desulfurization treatment apparatus and a desulfurization method for adjusting the components for sulfur (S) in the molten iron will be described by way of example.

The container L is a container that forms a space therein by means for storing or receiving the molten iron M. For example, it may be a ladle used to take or take the molten iron M in various operation steps. The container L may include a refractory wall provided inside the outer shell and the outer shell because it stores the hot molten iron at a high temperature.

Of course, the container (L) is not limited to the ladle, it is possible to accommodate the molten iron, the container of various means capable of installing the stirrer 200 and the nozzle 110 is possible.

The stirrer 200 is immersed in the molten iron (M) received in the container (L), a means for stirring the molten iron (M) by the rotation operation, may be formed in a similar form to the general stirrer 200 of the KAL apparatus. . That is, the stirrer 200 is composed of a plurality of blades, the impeller 210 to be immersed in the molten iron (M) to stir the molten iron (M), extending in the vertical direction, the shaft 220 connected to the upper portion of the impeller 210 ), A driving unit 230 providing rotational power to the shaft 220.

Here, the impeller 210 composed of a plurality of blades may be formed larger than the width of the lower end portion. That is, it may be formed to be inclined so that the width becomes narrower from the upper end to the lower end. From this, the downflow may occur in the molten iron M stirred by the rotation of the impeller 210. The shape of the impeller 210 should just be able to fully stir the molten iron M received by the container L, The structure and shape are not specifically limited.

The refining agent supply 100 is a refining agent for refining molten iron M, for example, a refining agent storage unit 120 in which a desulfurization agent for desulfurization is stored, a nozzle 110 for injecting the refining agent provided from the refining agent storage unit 120 into the container L, once Refining agent supply line 130 connected to the refining agent storage unit 120 and the other end connected to the nozzle 110, the gas storage unit 120, the gas storage unit for allowing the refining agent to move through the refining agent supply line 130, once The gas supply line 150 is connected to the gas storage unit 120 and the other end is connected to the refiner supply line 130 or the refiner storage unit 120 to allow the refiner to be moved to the nozzle 110. Include.

The refining agent is solid and may be, for example, a desulfurizing agent in a powder or fine particle state, and more specifically, a CaO-based material. Of course, the present invention is not limited thereto, and a CaC ₂ -based or Mg-based desulfurization agent can also be used. The desulfurization agent is stored in the refining agent storage unit 120 and is supplied into the container L through the refining agent supply line 130 and the nozzle 110.

The refiner storage unit 120 according to the embodiment is a hopper, but is not limited thereto, and may store or receive a refiner, and various storage means capable of supplying a refiner to a refinery supply line may be applied.

Refining agent supply line 130 and gas supply line 150 As described above, the moving passage for moving the refining agent of the refining agent storage unit 120 to the nozzle 110 is a pipe or pipe shape having an internal space.

Meanwhile, before the impeller 210 is immersed in the molten iron, as shown in FIG. 1A, the height of the top surface of the molten iron maintains a horizontal hot water surface without any change. However, when the impeller 210 is immersed in the molten iron and rotated, as shown in FIG. 1B, the molten iron region in which the impeller 210 is located, that is, the center of the hot water level, exhibits a lower water surface behavior than the edge water surface. In other words, the tang surface behavior appears that the tang surface height increases toward both sides with respect to the impeller 210.

In the present invention, the installation position of the nozzle 110 is determined in consideration of the height of the molten iron bath surface during the stirring of the impeller before and after the immersion.

The nozzle 110 is provided so as to penetrate from the side wall of the container L in the width direction (width direction of the container), and injects a refining agent, for example, a desulfurization agent, into the molten iron M received in the container L. At this time, the nozzle 110 is installed in the container (L), the installation height is limited, the molten iron (M) in the state before the stirring of the molten iron (M) or before the stirrer 200 operation (hereinafter, standby state) The top of the molten iron M when the stirrer 200 is operated for the refining or desulfurization (hereinafter, in the refining operation of the molten iron) is higher than the height H ₁ of the uppermost surface of the surface (bath surface) (see FIG. 1A). It is located lower than the height H ₂ of the surface (see FIG. ₂ ). More specifically, the molten iron is located at least 10 cm or more, more preferably 15 cm or more above the molten iron M in the atmospheric state, when the impeller 210 rotates at the maximum speed during the refining (desulfurization) operation. (M) Installed at least 15cm below the floor. Here, the 10 cm upper position from the molten iron M bath surface in the standby state becomes the lowest height of the nozzle 110, and the 15 cm lower position from the molten iron bath surface during refining (desulfurization) operation is the highest height of the nozzle.

Thus, the minimum height of the nozzle 110 is limited to 10 cm from the molten iron M surface in the air state due to the atmospheric condition in which the molten iron M is not refined, the thickness of the slag, the shaking of the molten surface during transportation of the container, and the like. This is to prevent the nozzle 110 from being in contact with the molten iron so that problems such as melting or clogging are not generated. In other words, when the nozzle 110 is located above the molten iron M surface in the standby state, but located less than 10 cm above the molten iron M surface, it contacts and damages the molten iron M. Or clogging may occur, and in the present invention, the minimum height of the nozzle 110 is limited to 10 cm from the molten iron M surface of the air.

In addition, the upper limit height of the nozzle 110 is limited to 15 cm below the top of the hot water surface during stirring or refining operation in order to improve refining efficiency or desulfurization efficiency and prevent scattering of the refining agent. For example, if it is located at the lower side of the top of the molten iron during stirring or refining operation, but is placed too high at a height of less than 15 cm, the stirring efficiency of the molten iron and the blowing efficiency of the refining agent are drastically lowered and the refining efficiency is lowered. , The scattering of the refiner will be severe. Therefore, in the present invention, the upper limit height of the nozzle is limited to 15 cm from the top height of the molten iron during stirring or refining.

As shown in FIG. 2, the nozzle 110 according to the embodiment is installed in parallel with the radial direction of the container L or side by side along an imaginary line extending in the radial direction. That is, the nozzle 110 is provided so that the nozzle 110 is parallel to the radial direction of the container or along the imaginary line extending in the radial direction. In other words, the nozzle 110 is installed to be perpendicular to the extension line A extending in the width direction of the container L in contact with the outer surface of the container (L). In other words, the tip of the nozzle 110 into which the refining agent is blown is provided so as to face the center of the radial direction of the container L. As shown in FIG.

The installation direction of the nozzle 110 is not limited to the embodiment shown in FIG. 2, and as in the first modified example shown in FIG. 3, the container 110 is in contact with the outer surface of the nozzle 110 and the container L. The angle θ formed by the extension line A extending in the width direction of L) may be inclined to be an obtuse angle or an acute angle, and may be installed to be inclined in a direction corresponding to the rotation direction of the impeller 210. According to this first modification, the desulfurization agent blown from the nozzle 110 is blown in a direction corresponding to the direction of rotation of the impeller 210, thereby improving the rotational stirring force of the molten iron M compared with the embodiment. As a result, the desulfurization efficiency is improved as compared with the conventional art.

In addition, as another example, as in the second modification shown in FIG. 4, the angle formed by the nozzle 110 and the extension line A extending in the width direction of the container L in contact with the outer surface of the container L is made. (θ) is inclined so as to be an obtuse angle or an acute angle, it may be installed to be inclined in a direction opposite to the rotation direction of the impeller 210. In this case, although the stirring force is low compared with the 2nd modification, since the injection direction of a refiner is a direction opposite to the rotation direction of the impeller 210, the collision by the stirring flow arises. Thus, in the case of using a CaO-based desulfurization agent, a CaS film is formed on the surface of the desulfurization agent by the reaction of the molten iron (M). As the desulfurization agent collides with the molten iron (M), the CaS film is peeled off, so that a refining agent, that is, CaO is exposed and again. Participating in the molten iron (M) desulfurization, the desulfurization efficiency is improved. In addition, since the refining agent is dispersed by the above-mentioned collision, the surface area is increased, and the desulfurization efficiency is improved.

Hereinafter, the molten iron processing method using the molten iron processing apparatus according to an embodiment of the present invention. At this time, the process of desulfurizing molten iron M using a desulfurization agent as a refiner is demonstrated to an example.

First, the molten iron M to be desulfurized is received in a container such as a ladle and transferred to the molten iron refining position. Thereafter, an inert gas such as nitrogen, argon, carbon dioxide, or the like is supplied to the nozzle 110 through the gas supply line 150 at a predetermined pressure to prevent molten iron from penetrating into the nozzle 110. Thereafter, the impeller 210 of the stirrer 200 is rotated to be immersed (or deposited) in the molten iron, and a desulfurizing agent is introduced into the molten iron.

In this case, first, the desulfurization agent is introduced by dropping the desulfurization agent from the upper side of the container L into the container L, and then the desulfurization agent is introduced through the nozzle 110. More specifically, with respect to the total time for refining the molten iron by adding a refining agent to the molten iron (M), when the end of the refining is 100%, from 10% to after the start of refining the molten iron (M) Refining agent is introduced from the upper side of the vessel L up to 15% or less (that is, the initial section), and then desulfurizing agent is introduced from the nozzle 110 while increasing the rotational speed of the impeller 210 to the maximum speed ( See FIG. 5).

In the above, in the desulfurization agent, the container 110 is disposed in a stepwise manner through the nozzle 110, and the entire amount of the desulfurization agent to be introduced for desulfurization may be introduced through the nozzle 110.

By the addition of such desulfurization agent, molten iron and sulfur (S) react in the container (L) to desulfurize.

To do this, in the present invention, the desulfurizing agent with the molten iron top bath surface height (H _1), the upper side, hot metal (M) stirred during hot metal (M) nozzle 110 installed at a lower side position of the top bath surface height (H ₂₎ at the time of air By adding, the degree of dispersion of the desulfurizing agent in the molten iron (M) is improved as compared with the conventional, the reactivity is improved, thereby improving the desulfurization efficiency compared to when the desulfurizing agent is added only to the upper side of the container 110 as in the prior art have.

Accordingly, it is possible to reduce the consumption and processing time of the desulfurization agent necessary to meet the target sulfur (S) concentration.

Hereinafter will be described by comparing the results of the desulfurization treatment by the molten iron treatment method according to the Examples and Comparative Examples of the present invention.

For the experiment, the first to third examples and the comparative example used molten iron having the same component composition. And desulfurization was performed by changing desulfurization conditions as shown in Table 1.

In the molten iron treatment method according to the first embodiment, the desulfurization agent is blown using the nozzle 110 according to the embodiment of the present invention. In the molten iron treatment method according to the comparative example, the desulfurization agent is added only from the upper side of the container L. Desulfurizer blowing is not made from the nozzle 110.

	First embodiment	Second embodiment	Third embodiment	Comparative example
Total amount of desorbent (kg / ton)	8	8	7	8
Degassing agent input at the top of the container (kg / ton)	4	0	3.5	8
Desorbent input through the nozzle (kg / ton)	4	8	3.5	-
Rotational Speed of Impeller (rpm)	150	150	150	150
Processing time (min)	20	20	18	20
Final sulfur (S) concentration (% by weight)	0.0032	0.0027	0.0035	0.0052

As shown in Table 1, the concentration of sulfur (S) in the molten iron desulfurized by the molten iron treatment method according to the first to third embodiments is lower than in the comparative example. Through this, it is understood that the molten iron processing apparatus including the nozzle 110 according to the present invention has a higher desulfurization rate than the conventional molten iron processing apparatus.

In addition, compared to the first embodiment in which the desulfurization agent is divided into the upper side of the container L through the nozzle 110 and blown, the second embodiment in which all the desulfurization agent is blown through the nozzle 110 has a concentration of sulfur (S). low. This is because the rotational force by the desulfurization agent blown in from the nozzle 110 is added to the rotational force by the impeller 210, and the stirring force of the whole molten iron | metal is higher than the comparative example.

In addition, the third embodiment shows a lower sulfur (S) concentration than the comparative example even though the total amount of the desulfurizing agent is 13% less than the comparative example, and the treatment time is also reduced by 10%. From this it can be seen that by introducing the desulfurization agent through the nozzle 110 according to the embodiment of the present invention, the amount of desulfurization agent and the processing time can be reduced compared to the conventional.

Thus, in the embodiments of the present invention penetrates the side wall of the container (L), is higher than the height of the molten iron (M) in the standby state before the stirring of the impeller 210, the impeller 210 at the maximum speed The nozzle 110 is installed at a position lower than the height of the hot water surface at the top of the rotating state, and the refining agent is introduced. Thus, as the refining efficiency is improved as compared to when the refining agent is added from the upper side of the container L as in the related art, there is an effect of reducing the use and refining time of the refining agent.

According to the molten iron processing apparatus and the molten iron processing method which concern on this invention, it penetrates the side wall of a container, and is high compared with the molten metal height of the molten iron in the standby state before stirring of an impeller, and when an impeller is rotating at the maximum speed. The nozzle is installed at a position lower than the height of the top surface of the hot water, and a refiner is added. Thus, as the refining efficiency is improved as compared to when the refining agent is added from the upper side of the container as in the prior art, the use of the refining agent and refining time can be reduced.

Claims (17)

1. Containers capable of taking molten iron; And

   A stirrer which is charged and rotated into the vessel and has an impeller immersed in the molten iron in the vessel to stir the molten iron;

   It is installed so as to penetrate the side wall of the container in the radial direction of the container, when the impeller is in the state before the impeller is immersed in the container, it is higher than the height of the water surface of the molten iron, the impeller is immersed in the molten iron in the container A refining injector, which is installed to be lower than the height of the hot water surface of the molten iron in a rotating state, and includes a nozzle for injecting a refining agent for refining the molten iron into the vessel;

   A molten iron processing apparatus comprising a.
2. The method according to claim 1,

   The refiner injector,

   A refining agent storage unit in which the refining agent is stored;

   A refiner supply line having one end connected to the refiner reservoir and the other end connected to the nozzle; And

   A gas supply line connected to the refinery supply line to supply an inert gas for movement of the refinery;

   A molten iron processing apparatus comprising a.
3. The method according to claim 2,

   And the nozzle is in contact with an outer surface of the container so as to be perpendicular to an extension line extending in the width direction of the container.
4. The method according to claim 2,

   The nozzle,

   And an angle formed by the nozzle and an extension line extending in the width direction of the container in contact with the outer surface of the container so as to be oblique or acute.
5. The method according to claim 4,

   And the nozzle is installed to be inclined in a rotational direction or an opposite direction of the impeller.
6. The method according to any one of claims 1 to 5,

   The nozzle has an upward separation distance of 10 cm or more from an upper surface of the molten iron in the state before the impeller is immersed in the molten iron in the vessel, and the molten iron in the state in which the impeller is immersed and rotated in the molten iron in the vessel. A molten iron processing apparatus which is located and installed so that the downward distance from the uppermost surface may be 15 cm or more.
7. The method according to claim 6,

   A molten iron processing apparatus provided with a plurality of nozzles and opposingly installed.
8. The method according to claim 7,

   The molten iron processing apparatus is a KAR apparatus (KR; Kanvara reactor),

   The refining agent is a molten iron treatment device that removes sulfur (S) in the molten iron.
9. Taking the molten iron in the container;

   Immersing the impeller with the molten iron in the vessel to stir the molten iron by a rotation operation;

   Injecting a refining agent in an inward direction from the side wall of the container;

   Including,

   Injecting the refining agent in the inward direction from the side wall of the container,

   When the impeller is in the vessel before the impeller is immersed state, the position is higher than the molten iron of the molten iron, and when the impeller is immersed in the vessel, the position lower than the height of the molten iron of the molten iron The molten iron treatment method in which the refining agent is added.
10. The method according to claim 9,

    Injecting the refining agent in the inward direction from the side wall of the container,

    A molten iron treatment method in which an inert gas is blown together with the refining agent to move the refining agent into the container.
11. The method according to claim 10,

    In the refining agent in the inward direction from the side wall of the container,

    An upper distance from the upper surface of the molten iron in the state before the impeller is immersed by the molten iron in the vessel is 10 cm or more, and the uppermost surface of the molten iron in the state in which the impeller is immersed and rotated by the molten iron in the vessel; The molten iron processing method which injects the said refiner in the position of 15 cm or more of downward space | distance distances.
12. The method according to claim 10,

    Injecting the refining agent in the inward direction from the side wall of the container,

    And the refining agent is discharged and introduced through a nozzle provided to be perpendicular to an extension line extending in the width direction of the container in contact with the outer surface of the container.
13. The method according to claim 10,

    Injecting the refining agent in the inward direction from the side wall of the container,

    The refinery agent is installed on the side wall of the container, the molten iron processing method is introduced through the nozzle is inclined at an obtuse angle or an acute angle formed by the extension line extending in the width direction of the container in contact with the outer surface of the container.
14. The method according to claim 13,

    Injecting the refining agent in the inward direction from the side wall of the container,

    The nozzle is installed to be inclined in the rotational direction or the opposite direction of the impeller, molten iron processing method for introducing a refining agent in the direction or the opposite direction to the rotational direction of the impeller.
15. The method according to claim 9,

    And a step of injecting the refining agent from the upper side of the container before injecting the refining agent in the inward direction from the side wall of the container.
16. The method according to claim 15,

    When the refining end is 100% of the total time for refining the molten iron by injecting a refining agent into the molten iron,

    Refining agent is added from the upper side of the vessel until the time of 10% or less after the start of refining the molten iron,

    The molten iron processing method which introduce | pours a refiner inwardly from the side wall of the said container from the time exceeding 10%.
17. The method according to any one of claims 9 to 16,

    The refinery agent is a molten iron treatment method to remove sulfur (S) in the molten iron.

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