JP2019517392A - Apparatus for treating molten material and method of treating molten material - Google Patents

Abstract

An apparatus for treating a melt and a method of treating a melt are provided, which can effectively remove inclusions by injecting a gas into the interior of a vessel containing the melt. The container is provided with a melt injection part at the top and a hole is formed at the bottom part, a guide member disposed apart from the melt injection part to the hole side, and a melt injection part side from the guide member And a gas injection part installed at the bottom, and a chamber part extended in the width direction and having the inside released downward and the induction member and the gas injection part facing each other at the top of the container , A melt processing apparatus and a melt processing apparatus capable of forming a rotational flow of the melt using the induction member and the gas injection part at the time of melt processing and utilizing this to effectively remove inclusions We propose a method for treating molten products. [Selected figure] Figure 3

Description

  The present invention relates to a melt processing apparatus and a melt processing method, and more particularly to a melt processing apparatus capable of effectively removing inclusions and a melt processing method using the same.

The continuous casting method in the steel making sector is superior to the conventional ingot-making method in terms of uniformity of quality and practical efficiency. Therefore, many researches and developments have been conducted on the operation equipment and operation technology of the continuous casting method. As a result, almost all steel types, including high alloy steels, can be produced by continuous casting except for a few special applications. As an operation facility for such a continuous casting method, there is a continuous casting facility.
Continuous casting equipment is equipment that supplies molten steel refined from steel making equipment to produce a slab (Slab). The continuous casting equipment is ladle that transports molten steel (molten steel), ladle supplies ladle with molten steel and temporarily stores ladle (Tundish), ladle supplies ladle continuously with molten steel It consists of a mold (Mold), which is primarily solidified in (Slab), and a cooling table which performs secondary cooling of a slab continuously drawn from the mold and performs a series of forming operations.

The molten steel is poured into a tundish and retained for a predetermined time to float and separate inclusions, stabilize the slag and prevent reoxidation. Thereafter, the molten steel is supplied to the mold to form an initial solidified layer in the form of a slab. At this time, the surface quality of the slab is determined.
That is, the degree of the slab surface quality in the mold is determined by the cleanliness of the inclusions of the molten steel. For example, if the cleanliness of the molten steel against inclusions is not good, the inclusions themselves will cause defects on the slab surface, the inclusions will clog the immersion nozzle and anomalies in the flow of the molten steel, resulting in slab surface quality Decreases.

In the molten steel, the cleanliness with respect to inclusions changes considerably depending on the extent to which the inclusions are floated and separated by retention of the molten steel in the tundish for a predetermined time. The extent to which the inclusions are floated and separated is proportional to the residence time in the molten steel tundish.
Therefore, conventionally, as a plan for increasing the residence time of molten steel in tundish, a dam (Dam) or weir (Weir) is built inside the tundish, the flow of molten steel is controlled, and the residence time of molten steel is adjusted. did.
However, when the size of inclusions mixed in the molten steel is 30 μm or less, the time until the inclusions are floated and separated is longer than the residence time of the molten steel, so the inclusions having a size of 30 μm or less are There is a problem that it is difficult to remove using dish dams and weirs.

KR10-2013-0076187 A KR10-2015-0073449 A

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to inject gas into the interior of a vessel containing a melt to effectively remove inclusions. It is an object of the present invention to provide a melt processing apparatus and a melt processing method.
The present invention is an apparatus and method for processing a melt, which can effectively remove inclusions by forming a rotational flow of the melt with a gas injected into the interior of a vessel containing the melt. I will provide a.
The present invention controls a melt processing apparatus and melt processing capable of effectively removing inclusions by controlling the flow direction and rotational speed of a rotary flow formed inside a container containing the melt. Provide a way.
The present invention provides a melt processing apparatus and a melt processing method that effectively prevent the bare water surface formed in the melt from coming into contact with the atmosphere by the rotational flow of the melt contained in the container. .

  The apparatus for processing a melt according to an embodiment of the present invention made to solve the above problems is such that the inside is released upward, the melt injection part is provided at the top, and a hole is formed on at least one side of the bottom. A guide member installed at a distance from the melt injection portion to the hole side, and a gas injection portion located at the bottom from the induction member at the bottom portion of the melt injection portion. Do.

The induction member may include a first member spaced apart from the melt injection portion toward the hole and spaced apart from the bottom.
Preferably, the guide member includes a second member spaced apart from the first member toward the hole and in contact with the bottom.
The gas injection unit may be spaced apart from the first member toward the melt injection unit, or may be spaced apart from the second member toward the first member.
It is preferable that the chamber part is extended in the width direction, the inside is released downward, and is installed at the upper part of the container so as to face the induction member and the gas injection part.

Each of the guiding member, the gas injection part, the chamber part and the hole may be provided in plurality and may be located on both sides in the longitudinal direction centering on the melt injection part.
The gas injection part may be extended in the width direction and may be protruded to the upper surface of the bottom, and may be lower in height than the lower surface of the first member.
The gas injection portion can be positioned relatively closer to the first member than the melt injection portion.

The gas injection unit is installed on the bottom and has a block with a slit formed on the top, a gas injection pipe communicating with the slit, and a gas injection pipe, and controls the opening degree and opening / closing method of the gas injection pipe And a valve.
The chamber part is extended in the width direction, the lead part extended in the width direction, spaced apart on both sides in the length direction centering on the first member, and mounted on the lower surface of the lead part, respectively. A plurality of wall portions that contact or are separated from both side walls, and a plurality of flanges that extend in the longitudinal direction and are respectively attached to both side edges of the lead in the width direction and connect the plurality of wall portions It is preferable to include a part.

The plurality of wall portions include a first wall portion positioned to be separated from the gas injection portion toward the melt injection portion side, and a second wall portion positioned to be separated above the second member. It is good to include.
The first wall portion may be formed such that the lower surface is higher than the upper surface of the first member and can be immersed by the melt injected into the interior of the container.
It is preferable that the second wall portion is formed such that the lower surface is lower in height than the upper surface of the first member and can be dipped by the melt injected into the container.

The second wall portion may have at least one of an inclined surface, a vertical surface, a curved surface, and a recessed groove on one surface facing the first wall portion.
The melt processing apparatus is formed to supply gas, and a supply pipe communicating with the inside through the chamber part, and formed to discharge the gas, and communicates with the inside through the chamber part. Preferably, at least one of the exhaust pipes is included.
The melt processing apparatus supports the chamber portion so as to be able to move up and down, and a first operation portion that adjusts the height of the chamber portion according to the height of the upper surface of the melt injected into the interior of the container; A second actuating portion slidably supporting the chamber and adjusting the position of the chamber in the longitudinal direction according to the generation position of the surface of the molten metal poured into the container; It is preferable to include one.

The melt processing apparatus may further include a second gas injection unit spaced apart from the first member on the opposite side of the gas injection unit and disposed at the bottom.
Preferably, the melt injection part is formed to allow the passage of molten steel and is detachably mounted to the ladle of the continuous casting facility.
The gas injected into the interior of the container via the gas injection part may include an inert gas.

  In the method of treating a melt according to an embodiment of the present invention, the inside is released upward, a hole is formed at the bottom, a melt injection portion is provided at the top, and an induction member is provided between the hole and the melt injection portion. Preparing the container provided with the liquid, injecting the melt into the interior of the container, injecting the melt onto the top of the induction member, and introducing the induction member and the melt injection portion through the gas injection portion Injecting a gas into the interior of the container between them to form a rotational flow of the melt.

The method of treating a melt includes the step of forming a vacuum atmosphere or an inert atmosphere in a region covering a generation position of a bare metal surface of the melt by the gas injected into the inside of the container using a chamber part. Good.
The step of forming the rotational flow may include adjusting a gas injection position of the gas injection unit with respect to the induction member to control at least one of the flow direction and the number of rotations of the rotational flow.

  The step of forming the rotational flow may include controlling the gas injection method by the gas injection unit in at least one of a continuous method and an intermittent method.

  In the step of forming a rotational flow, the immersion height of the chamber portion with respect to the melt is adjusted to jet the upper portion of the induction member, and the flow rate of the melt flowing to the hole side and the upper portion of the induction member Preferably, the method further comprises the steps of: controlling the flow rate of the melt flowing to the gas inlet side.

In the step of forming the rotational flow, the gas is injected into the container between the gas injection portion and the induction member via the second gas injection portion, and at least one of the flow direction and rotational speed of the rotational flow is It can include controlling steps.
The melt comprises molten steel and the gas may comprise an inert gas.

According to an embodiment of the present invention, inclusions can be effectively removed by injecting a gas into the interior of the vessel containing the melt and contacting the inclusions. In addition, the rotational flow of the melt is formed by the gas injected into the interior of the vessel containing the melt, and the inclusions can be more effectively removed by increasing the frequency of contact of the inclusions with the gas. Furthermore, by controlling the flow direction and rotational speed of the rotary flow formed inside the vessel containing the melt, inclusions can be removed more effectively by significantly increasing the frequency of contact of the inclusions with the gas. be able to.
According to the embodiment of the present invention, the rotating flow of the melt contained in the container can effectively prevent the bare water surface formed in the melt from coming into contact with the atmosphere, and the reoxidation of the melt And contamination can be effectively prevented.

For example, when applied to a continuous casting process of a steel mill, argon gas is injected into the inside of a tundish containing refined molten steel to form a large number of air bubbles, and Al ₂ O ₃ or SiO ₂ is formed at the interface. By collecting various inclusions such as, etc., the inclusions can be effectively removed. Also, the injection position of argon gas to dams and weirs built inside the tundish is set at a predetermined position, and the gas injected into the inside of the tundish forms a rotational flow of molten steel and the flow direction of the rotational flow and The rotation speed can be controlled. Fine inclusions can be removed more effectively by significantly increasing the frequency of contact of argon gas or inclusions with bubbles thereof, in particular, fine inclusions of 30 μm or less, using this.
Also, a chamber is provided at the formation position of the bare surface of molten steel by the rotational flow of molten steel placed in a tundish, the lower portion of the chamber is immersed in the molten steel so as to cover the bare surface, and inert gas is contained inside the chamber. Can effectively prevent the bare metal surface of the molten steel from contacting the atmosphere. Furthermore, this can be used to effectively prevent reoxidation and contamination of the molten steel.

It is a schematic diagram of the processing apparatus of the molten material which concerns on the Example of this invention. It is a top view of the processing apparatus of the fusion thing concerning the example of the present invention. It is sectional drawing of the processing apparatus of the molten material which concerns on the Example of this invention. It is a state figure showing the removal method of the inclusion concerning the example of the present invention. It is a figure which shows the removal process and the result of the inclusion which concern on the Example of this invention, (a) injects argon gas into molten steel, and carries out the characteristic experiment to solidify, and the state of the section of the steel which solidification was completed Is a photograph taken with an electron microscope, (b) is an electron micrograph of the area around the solidified steel bubble after the above-mentioned characteristic experiment, and (c) is the above-mentioned characteristic experiment After implementation, it is a graph which detected the component around the bubble of solidified steel with an electron microscope. It is a figure which shows the modeling result of the processing apparatus of the molten material for flow analysis of the molten material which concerns on the Example of this invention. It is a figure which shows the flow analysis result of the molten material which concerns on the Example of this invention. It is a fragmentary view of processing apparatus of a fusion thing concerning an example and a modification of the present invention, and (a) is a fragmentary view showing a chamber part concerning the present invention example, (b) thru / or (i) are order FIGS. 11A and 11B are partial views showing a chamber unit according to first to eighth modified examples. It is a schematic diagram of the processing apparatus of the molten material which concerns on the comparative example of this invention. It is a photograph which shows the processing result of the molten material which concerns on the comparative example of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. However, the present invention is not limited to the embodiments disclosed below, but can be embodied in various forms different from one another. However, the embodiments of the present invention complete the disclosure of the present invention, and are provided to enable those skilled in the art to fully understand the scope of the invention. The drawings may be exaggerated to explain the embodiments of the present invention, and the same reference numerals in the drawings indicate the same elements.
Of the terms used to describe the embodiments of the present invention, "upper" and "lower" refer to the upper and lower portions, respectively, as part of the component. Also, "on" and "on" refer to a range that directly or indirectly contacts or acts on the upper and lower surfaces of the component.
The present invention is an apparatus and method for processing a melt that can be supplied with a melt, allowed to stay for a predetermined time, and supplied to subsequent equipment to effectively remove inclusions from the melt during processing. It relates to the method. In the following, examples will be described in detail on the basis of the continuous casting facilities and processes of a steel mill. However, the present invention can be applied in various ways to various equipment and processes in many industrial fields that process various melts.

FIG. 1 is a schematic view of a melt processing apparatus according to an embodiment of the present invention, FIG. 2 is a plan view of a melt processing apparatus according to an embodiment of the present invention, and FIG. 3 is an embodiment of the present invention FIG. 4 is a cross-sectional view of a melt processing apparatus according to an embodiment of the present invention, and FIG. 4 is a state diagram showing a method of removing inclusions according to an embodiment of the present invention.
Referring to FIGS. 1 to 3, the apparatus for processing a melt according to the embodiment of the present invention has the inside open to the upper side, the melt injection unit 1 is provided at the top, and the hole is provided on at least one side of the bottom 13. The vessel 10 in which the fuel injection portion 14 is formed, the induction member spaced from the melt injection portion 1 to the hole 14 side, and the gas injection from the induction member to the melt injection portion 1 side, and installed at the bottom portion 13 And 400. Further, the apparatus for treating a melt according to the embodiment of the present invention is installed in the upper part of the container 10 so as to be extended in the width direction X, open inside downward, and face the induction member and the gas injection unit 400. The chamber unit 500 is included. On the other hand, the induction member, the gas injection part 400, the chamber part 500, and the holes 14 are respectively provided in plurality, and are located on both sides in the longitudinal direction Y centering on the melt injection part 1.

The melt M may include molten steel. The molten steel is prepared after completion of the refining in a steel making facility, and is transported to the upper side of the vessel 10 by entering a transport vessel, for example, a ladle (not shown) of a continuous casting facility.
It is preferable that the melt injection part 1 is a hollow refractory nozzle formed so that molten steel can pass through. The melt injection part 1 may include a shroud nozzle. The melt injection unit 1 can be mounted on and supported by a manipulator provided outside the container 10. The melt injection part 1 can be connected to a future collector nozzle by means of an elevation of a manipulator (not shown) and can communicate with the inside of the ladle. The melt injection unit 1 is positioned at a predetermined height apart from the bottom 13 of the container 10. The lower part of the melt injection portion 1 can be immersed in the melt M by injecting the melt M into the inside of the container 10.
On the other hand, the gas g injected into the interior of the container 10 through the gas injection unit 400 may include an inert gas. The inert gas may be argon gas Ar.

The container 10 includes a bottom 13 and side walls projecting along the periphery of the bottom 13. The container 10 is formed in the shape of a container whose inside is open upward. At this time, the side wall portion includes longitudinal side walls 12 and lateral side walls 11. The outer surface of the container 10 can be formed, for example, of iron skin to maintain its shape, and a refractory is built on the inner surface to accommodate the melt M. The container 10 may include a continuous casting facility Tundish.
The container 10 can be formed in a rectangular shape symmetrical with respect to the central portion in the length direction Y and the width direction X as a reference. At this time, in the container 10, the width in the length direction Y is preferably larger than the width in the width direction X. On the other hand, the melt injection unit 1 is provided at the top of the container 10. At this time, the melt injection portion 1 is vertically aligned at the central portion in the length direction Y and the width direction X of the container 10.

The holes 14 can be formed on at least one side of the bottom 13 of the container 10. It is preferable that a plurality of holes 14 be provided. The plurality of holes 14 may be respectively separated in the length direction Y, and vertically formed on both sides of the bottom 13 in the vicinity of the widthwise side walls 11. The holes 14 can be rationally positioned symmetrically with respect to the central portion in the longitudinal direction Y and the width direction X of the container 10. The melt M accommodated inside the container 10 is discharged to the lower side of the container 10 through the hole 14. The hole 14 may be fitted with a gate 60.
The guiding member includes a first member 20 and a second member 30. Further, the induction member may be spaced apart from the melt injection portion 1 to the hole 14 side. At this time, the guiding member preferably includes only the first member 20 or both the first member 20 and the second member 30. That is, the guiding member can include at least the first member 20. The first member 20 and the second member 30 are made of a refractory material, and the melt M is accommodated in the container 10 and is accommodated at a desired height, for example, from the normal state in the middle stage of continuous casting operation to the molten steel level In this case, the flow of the melt M can be controlled while being locked to the melt M.

The first member 20 is preferably provided to controllably the flow of the melt M injected into the interior of the container 10. The first member 20 is separated from the melt injection portion 1 to the hole 14 side, extended in the width direction X, and separated from the bottom portion 13 by a predetermined height to the upper side. It is installed to connect between the facing surfaces. The first member 20 can include a tundish Weir. It is preferable that a plurality of first members 20 be provided and disposed at mutually spaced positions in the longitudinal direction Y centering on the melt injection portion 1. The first member 20 can guide the flow P1 in the vicinity of the melt injection portion 1 of the melt M injected into the interior of the container 10 through the melt injection portion 1 to the inner upper portion or the inner lower portion of the container 10 .
On the other hand, the flow direction and the flow velocity of the melt near the first member 20 may be controlled by adjusting at least one of the height of the upper surface and the height of the lower surface of the first member 20. The ideal height at which the melt near the first member 20 can be smoothly collected to the gas injection portion 400 side through the lower surface of the first member 20 by the Venturi effect near the gas injection portion 400. The height of the lower surface of the first member 20 is determined. Also, the height of the upper surface may be determined such that the upper surface of the first member 20 is completely locked to the melt by an ideal depth.

  The second member 30 is preferably provided to controllably the flow of the melt M injected into the interior of the container 10. The second member 30 is separated on the side of the hole 14 of the first member 20, extended in the width direction X, contacted with the bottom 13, and connected to each other by connecting mutually facing surfaces of the longitudinal side walls 12 of the container 10 Be done. The second member 30 may be a tundish dam. A plurality of second members 30 are provided, and are disposed at mutually spaced positions in the longitudinal direction Y centering on the melt injection portion 1. At this time, it is preferable that the installation position of the second member 30 be biased to the first member 20 side so as to be closer to the first member 20 side than the hole 14. On the other hand, at a lower predetermined position of the second member 30, a residual liquid hole (not shown) is provided. The residual liquid hole is formed through the second member 30 in the longitudinal direction Y at a position in contact with the bottom portion 13.

The second member 30 jets the upper portion or the lower portion of the first member 20 in the direction from the melt injection portion 1 toward the hole 14, and the vicinity of the second member 30 of the melt M guided to the second member 30 side can be derived by dividing each flow into rotating flow P _C of the melt M that the flow P2 around hole 14 toward the hole 14 side toward the side surface of the first member 20. On the other hand, the flow direction and flow velocity of the melt M in the vicinity of the second member 30 are controlled by adjusting at least one of the height of the upper surface of the second member 30 and the separation distance of the second member 30 with respect to the first member 20 It is possible.
The melt M is retained in the container 10 for a predetermined time by the first member 20 and the second member 30, and inclusions can be floated and separated. However, in the case of fine inclusions of 30 μm or less, it is difficult to float and separate only by flow control using the first member 20 and the second member 30. This is because, in the case of flow control using only the first member 20 and the second member 30, the molten material M is sufficiently contained in the container 10 during the time when fine inclusions of 30 .mu.m or less can be floated and separated. It is because it can not make it stagnate.

Thus, in the embodiment of the present invention, the gas inlet portion 400 between the guide member and the melt injection unit 1 is provided, forming a rotating flow P _C of the melt M in the vicinity of the guide member by using this. For example, when the induction member includes only the first member 20, the gas injection unit 400 is separated from the first member 20 to the melt injection unit 1 side between the first member 20 and the melt injection unit 1. Will be installed. Further, when the induction member includes both the first member 20 and the second member 30, the gas injection unit 400 may be installed between the first member 20 and the melt injection unit 1, or the first member 20 and the first member 20 may be The second member 30 may be spaced apart from the second member 30 to the first member 20 between the two members 30.
That is, the gas injection unit 400 is provided between the first member 20 and the melt injection unit 1 or between the first member 20 and the second member 30, and the gas g is injected in the vicinity of the first member 20 An upflow and a rotational flow P _C of melt M may be formed. Therefore, it is preferable that the molten material M in the vicinity of the first member 20 be rotated a plurality of times inside the container 10 and sufficiently retained so that fine inclusions of 30 μm or less can be floated and separated. In particular, it is preferable to increase the rotation speed of the rotating flow P _C, it is possible to greatly improve the frequency of contact between the inclusions and gases.

In this case, the inclusions S ′ mixed in the melt M stay for a long time in the vicinity of the first member 20 along the rotational flow P _C of the melt M, floated and separated, and provided on the upper surface of the melt M The slag S is collected and removed smoothly. Further, the inclusions S ′ mixed in the melt M stay for a long time near the first member 20 along the rotational flow P _C of the melt M, and as shown in FIG. While being frequently in contact with the bubbles of the gas g injected into the melt M through the above, it can be collected at the interface of the bubbles and be more effectively removed.
On the other hand, when the guiding member includes only the first member 20, the gas injection unit 400 may be disposed between the first member 20 and the hole 14 in proximity to the first member 20. At this time, the upward flow by the gas g injected from the gas injection unit 400 jets the upper portion of the first member 20 in the direction from the hole 14 toward the melt injection unit 1 by the wall portion of the chamber unit 500 described later. Induced to Then, the pressure of the melt M in the regions on both sides in the longitudinal direction Y is changed around the first member 20 by the gas g injected from the gas injection portion 400, and the gas flows from the melt injection portion 1 to the holes 14. In the direction, a flow through the lower surface of the first member 20 is formed. As a result, a rotational flow of the molten material M is formed to cover the vicinity of the first member 20 and repeatedly rotate a plurality of times. Rotating flow at this time, the direction of rotation, for example, a different aspect to the rotation direction of the rotational flow P _C of FIG.

The gas injection unit 400 is spaced from the induction member toward the melt injection unit 1 and is installed on the bottom 13. For example, the gas injection unit 400 is spaced from the first member 20 toward the molten material injection unit 1 or the second member 30 and installed at the bottom 13. A plurality of gas injection units 400 may be provided, and may be located on both sides of the melt injection unit 1 in the longitudinal direction Y. For the gas injection unit 400, for example, the configuration and method of a porous plug provided in Ladle furnace or the like is applied.
The gas injection part 400 is extended in the width direction X, protrudes on the upper surface of the bottom 13, and has a block whose height is lower than the lower surface of the first member 20, a plurality of slits formed on the upper surface of the block, and the container 10 And a control valve 420 mounted on the gas injection pipe 410 to control the opening degree and the opening / closing system. At this time, the control valve 420 controls opening and closing so that the gas g is continuously injected or intermittently injected into the melt M.

The block can be formed of a dense refractory and can be formed in various shapes with a top surface of a predetermined area. The slits preferably extend inside the block and penetrate the top of the block in the height direction. The slit may be formed of a hollow tube or may be formed of a porous refractory so that the gas g can flow inside. The gas g can be injected into the interior of the container 10 in the form of fine bubbles through the slit.
The block of the gas injection unit 400 can be positioned relatively closer to the first member 20 than the melt injection unit 1. At this time, the separation distance W1 between the block and the first member 20 is adjusted to control at least one of the flow direction and the number of revolutions of the melt by the gas g injected from the gas injection unit 400 into the interior of the container 10. Is preferred.
For example, as the separation distance W1 of the block with respect to the first member 20 is shorter, the flow direction of the melt due to the gas g is formed so as to jump vertically along the first member 20. In the opposite case, the flow direction of the melt is formed to be relatively gently rising along the first member 20.
Also, the shorter the distance W1, the venturi (Venturi) effect rotational flow _{P C} of the melt M between the first member 20 and the second member 30 is smoothly recovered into the gas injection unit 400 side, rotation The rotation speed of the current PC is increased. Conversely, the longer the distance W1, and the first member 20 recovered about the melt M is reduced between the second member 30, so that relatively reduce the rotational speed of the rotating flow P _C.

As described above, in response to the position of the gas injection part 400 in the vicinity of the first member 20, the venturi effect can be caused. That is, the installation position of the gas injection unit 400, repeats the melt M in the vicinity of the first member 20 to rotate several times, depending on forming a continuous strong rotational flow P _C, following size of 3μm Fine inclusions are floated and separated on the upper surface of the melt M and collected by bubbles of the gas g.
On the other hand, a bare metal surface N of a predetermined size is formed on the gas injection part 400 or the first member 20. This is because the upper surface of the melt M is due to the fast upflow of the melt M between the first member 20 and the gas injection 400 by the gas g injected into the melt M via the gas injection 400. This is because the slag S formed on the bottom is pushed. In this case, the molten material M comes in contact with the atmosphere at the bare water surface N and is re-oxidized to reduce the cleanliness.
Therefore, as in the embodiment of the present invention, the chamber unit 500 may be provided on the induction member and the gas injection unit 400. When the surface N of the molten metal is formed on the upper surface of the melt M, the vicinity C of the surface N of the molten metal is covered with the chamber portion 500, and the molten material M contacts the atmosphere by forming a vacuum atmosphere or an inert atmosphere. Can be effectively prevented. As described above, the bare water surface N is protected from the open air by the chamber portion 500 so that the gas g can be sufficiently strongly injected into the gas injection portion 400 regardless of the formation of the bare water surface N. it can be achieved in the formation of a strong rotating flow P _C.

Further, the lower portion of the chamber portion 500 is immersed in the melt M, and the upper portion of the first member 20 is spouted in the direction from the melt injection portion 1 to the hole 14 using the immersed portion of the chamber portion 500 The object M can be guided toward the lower part of the first member 20. Therefore, it is possible to stably form a rotating flow P _C to the vicinity of the first member 20. That is, the chamber 500 helps in the formation of rotating flow P _C with protection Hadakayumen N, which serves to increase the rotational speed of the rotating flow P _C. Therefore, the chamber portion 500 improves the inclusion removal efficiency and further improves the cleanliness of the melt.
The chamber portion 500 is extended in the width direction X, the inside is opened downward, and the chamber portion 500 is installed on the top of the container 10 so that the induction member and the gas injection portion 400 face each other. At this time, a plurality of chamber parts 500 are provided, and are installed at positions mutually separated in the length direction Y centering on the melt injection part 1.
The chamber portion 500 is extended in the width direction with a lead portion 510 extended in the width direction X, spaced apart on both sides in the length direction centering on the first member 20, and mounted on the lower surface of the lead portion 510, A plurality of wall portions contacting or separating the longitudinal side walls of the container 10, and extending in the longitudinal direction Y, respectively mounted on the side edges of the lead portion 510 in the width direction X; The plurality of wall portions and the plurality of flange portions 511 including the plurality of flange portions 511 connecting the body portions are immersed in the melt M, and the bare metal surface N is airtightly protected by the chamber portion 500.

At this time, portions to be immersed in the melt M, for example, the plurality of wall portions and the plurality of flange portions 511 are at least partially protected by a refractory. The lower surfaces of the plurality of flanges 511 are the lower surfaces of the plurality of wall portions and the first member so as to prevent collision or interference of the flanges 511 with the first member 20 when immersed in the melt M. The height may be higher than the top surface of 20.
The lead portion 510 is a plate-like member, and can form an area where the bare metal surface N formed on the upper surface of the melt M can be sufficiently covered. The installation height of the lead portion 510 is determined such that it can be separated by a predetermined height from the upper surface of the first member 20 or the upper surface of the melt M injected into the interior of the container 10. The plurality of wall portions may include a first wall portion 520 and a second wall portion 530. The first wall portion 520 may be spaced apart from the gas injection portion 400 toward the melt injection portion 1, and the second wall portion 530 may be spaced apart above the second member 30. It is preferable to do.

The first wall 520 may be, for example, a vertical wall extended in the width direction X. The lower surface of the first wall portion 520 is formed to be higher in height than the upper surface of the first member 20, and is extended downward to a immersible height by the melt M injected into the interior of the container 10. . The second wall 530 is, for example, a vertical wall extended in the width direction X. The lower surface of the second wall portion 530 is formed to be lower in height than the upper surface of the first member 20, and is extended downward to a height at which it can be immersed by the melt M. The second wall portion 530 adjusts the separation distance d1 with respect to the second member 30 to flow the flow rate Q1 of the melt flowing to the hole 14 side of the melt M spouting the upper portion of the first member 20 and the gas injection portion 400 The flow rate Q2 of the melt flowing to the side can be determined respectively, and the relative magnitude and absolute magnitude of the value can be controlled respectively.
For example, as the distance d1 to the second member 30 is short, the flow rate of the melt used to form the rotating flow P _C to flow to the gas inlet portion 400 side than the flow rate Q1 of the melt flowing to the hole 14 side Q2 gets bigger. Conversely, the distance d1 to the second member 30 is long, the flow rate of the melt flow rate Q1 of the melt flowing to the hole 14 side is used to form the rotating flow P _C to flow to the gas injection unit 400 side It becomes larger than Q2.

In this case, these flow rates are closely related to as rotational speed of the rotating flow P _C. That is, smoothly rotating flow P _C formed as the flow rate Q2 of the melt to flow into the gas injection unit 400 side is used to form the rotating flow P _C becomes large, it is possible to speed is increased.
That is, the second member 30 of the guide member and the second wall portion 530 of the chamber 500 is a main configuration for determining the rotational speed of the rotating flow P _C, rotating flow P by the distance d1 between them Determine the number of rotations of _C. Therefore, the second member 30 may be constructed such that the second wall portion 530 faces at least the up-down direction at a predetermined position separated to the hole 14 side of the first member 20.
On the other hand, the second wall 530 is provided on the opposite side of the gas injection unit 400 with the first member 20 at the center. At this time, an inclined surface is provided on one surface of the second wall 530 facing the first member 20. The inclined surface is formed to be inclined upward from the lower end of the second wall portion 530 to the upper end from the first member 20 to the second member 30. The inclined surface smoothly lowers the molten material M for causing the first member 20 to jet in the direction from the molten material injection portion 1 to the second member 30, and guides the molten material M to the lower surface side of the first member 20.
In the chamber portion 500, a negative pressure is formed by the gas g flowing into the inside of the chamber portion 500 at the bare water surface N, and an inert atmosphere is formed. Of course, the supply pipe 560 and the exhaust pipe 570 are attached to the chamber 500 so that the atmosphere inside the chamber 500 can be directly controlled.

The supply pipe 560 is formed to be able to supply a gas, and can pass through, for example, one side of the lead portion 510 of the chamber portion 500 to communicate with the inside. The exhaust pipe 570 is formed to exhaust the gas, and communicates with the inside through the other side of the lead portion 510 of the chamber portion 500, for example. An inlet gas supply source (not shown) of the supply pipe 560 may be connected to supply an inert gas to form an inert atmosphere in the chamber 500. When connected to an exhaust pump (not shown) at the inlet of the exhaust pipe 570 and a vacuum pump (not shown), these can be used to form an inert atmosphere or a vacuum atmosphere inside the chamber 500. .
On the other hand, the apparatus for processing a melt according to the embodiment of the present invention supports the chamber unit 500 so as to be able to move up and down, and the chamber of the chamber unit 500 according to the height of the upper surface of the melt M injected into It includes a first actuating portion 540 whose height can be adjusted, and slidably supports the chamber portion 500, and the length direction according to the generation position of the surface N of the molten material injected into the inside of the container 10 The second operation unit 550 may adjust the position of the chamber unit 500 to Y. It is applied to the manipulator of the continuous casting equipment of these operation parts. For example, although it can be formed with a structure such as a hydraulic cylinder, it is not particularly limited thereto.

The first actuating portion 540 is attached to the center of the upper surface of the lead portion 510, and is formed so as to be extensible and contractible in the height direction Z using, for example, hydraulic pressure. The second operating unit 550 is mounted on the top of the first operating unit 540, and is formed to be extensible and contractible in the longitudinal direction Y, using, for example, hydraulic pressure. The movement in the length direction Y by the second operating unit 550 is transmitted to the chamber unit 500 via the first operating unit 540.
On the other hand, the apparatus for processing a melt according to the embodiment of the present invention further includes a second gas injection unit (not shown) separated from the first member 20 on the opposite side of the gas injection unit 400 and installed at the bottom 13. Can be included. For example, when the gas injection unit 400 is disposed apart from the first member 20 on the melt injection unit 1 side, the second gas injection unit is provided between the first member 20 and the second member 30, When the gas injection unit 400 is provided between the first member 20 and the second member 30, the second gas injection unit is spaced apart from the first member 20 toward the molten material injection unit 1. The configuration and operation method of the second gas injection unit are the same as the configuration and operation method of the gas injection unit 400, and thus the detailed description thereof will be omitted.

Since the gas g can be injected into the melt M from the opposite side of the gas injection unit 400 around the first member 20 using the second gas injection unit, and the flow can be directly controlled, in this case, the rotating flow P _C is more precisely controllable.
The gates 60 are formed to be able to open and close the holes 14 and are respectively mounted on the lower surface of the container 10 so as to be vertically aligned with the holes 14. The gate 60 includes a slide gate of a continuous casting facility, and the slide gate can adjust the opening degree of the hole 14 to adjust the discharge amount of the melt M. The nozzle 70 is attached to the gate 60.
The nozzle 70 is a hollow refractory nozzle extended in the height direction Z, and is mounted on the lower surface of the gate 60 so as to be in communication with the hole 14. The molten material M discharged from the hole 14 passes through the gate 60, flows into the interior of the nozzle 70, and can be supplied to a mold (not shown) provided so as to cover the lower portion of the nozzle 70. For example, the nozzle 70 includes a submerged entry nozzle of a continuous casting facility.

The mold (Mold) can be a rectangular or square hollow mold block, with the inside open vertically at the top and bottom. The melt M supplied to the mold can be primarily solidified into a slab (Slab), and passes through a curved or vertically curved cooling table (not shown) provided on the lower side of the mold, It is secondarily cooled, shaped and continuously cast into a semi-finished slab.
Looking at the operation of the melt processing apparatus formed as described above, after the melt is transported by the transport container, it melts into the interior of the container 10 through the melt injection portion 1 coupled to the transport container. Inject object M. At this time, the injected melt forms a flow that directs the induction member along the bottom 13, and an upward flow is formed by the injection of the gas g of the gas injection unit 400 installed at a position preceding the induction member. . A part of the upflow swirls toward the melt injection portion 1 side, and most of the upward flow jets the first member 20 and collides with the second wall portion 530 of the chamber portion 500 to divert the flow downward. Part of the downward flow jets the upper part of the second member 30 and escapes to the hole 14 side, but the remainder descends and reaches the bottom 13, and then the Venturi effect near the gas injection portion 400 the lower surface of the first member 20 to form a rotating flow P _C and jet. By means of this rotating flow, the inclusions S ′ in the melt M are removed in contact with the gas g several times. During this step, the chamber portion 500 covers the surface N of the hot water to form an inert atmosphere or a vacuum atmosphere, thereby preventing contamination of the melt M by the atmosphere.

Hereinafter, a method of treating a molten material according to an embodiment of the present invention will be described in detail. A method of treating a melt according to an embodiment of the present invention is a method of treating a melt applicable to the above-described apparatus for treating a melt according to an embodiment of the present invention, wherein the inside is opened upward and the hole is at the bottom. Providing a container having a melt injection part provided at the top, and a guide member provided between the hole and the melt injection part, injecting the melt into the interior of the container, induction Injecting the melt into the upper part of the member, injecting the gas into the container between the induction member and the melt injection part via the gas injection part, and forming a rotational flow of the melt . At this time, the melt M preferably includes molten steel, and the gas g preferably includes an inert gas.
First, the inside is opened upward, the hole 14 is formed in the bottom 13, the melt injection portion 1 is provided on the top, and the container 10 in which the induction member is provided between the hole 14 and the melt injection portion 1 is obtained. prepare. At this time, the induction member is separated from the melt injection portion 1 to the hole 14 side, is separated from the bottom portion 13, and is attached to the longitudinal direction side wall 12 of the container 10, and the first member 20 It is preferable to include a second member 30 separated from 20 to the hole 14 side and in contact with the bottom 13 to be attached to both longitudinal side walls 12 of the container 10.

Thereafter, a transport container (not shown) is attached to the melt injection unit 1, the melt injection unit 1 is opened, and the melt M in the transport container is injected into the interior of the container 10.
Then, the injection of the melt M is continuously performed, and the level of the melt M is raised to jet the melt M to the top of the induction member. At this time, the melt M can be jetted to the upper portion of the first member 20 and the second member 30 and can flow toward the hole 14 side. For example, the melt M flowing from the melt injection portion 1 to the first member 20 side jets the upper surface and the lower surface of the first member 20 and flows to the second member 30 side, and the upper surface of the second member 30 It jets and flows to the hole 14 side.
Then, gas is injected into the container 10 between the guide member and the gas injection unit 400 through the gas injection unit 400, forming a rotating flow P _C of the melt M. At this time, the gas g is injected into the vessel 10 between the first member 20 and the gas injection unit 400 through the gas injection unit 400, forming a rotating flow P _C of the melt. Alternatively, the gas g is injected into the container 10 between the second member 30 through the gas inlet portion 400 and the first member 20 to form a rotating flow P _C of the melt.

At the same time as the step of forming the rotational flow P _C of the melt M, a vacuum atmosphere is applied to the area covering the generation position of the bare metal surface N of the melt M by the gas g injected into the inside of the container Or form an inert atmosphere.
This step can be performed while moving the chamber unit 500, for example, in the length direction Y according to the position of the bare metal surface N, for example, due to a change in the upper surface level of the melt M due to reasons such as continuous casting. The chamber unit 500 is moved, for example, in the height direction Z. Therefore, the immersion depth of the chamber portion 500 can be made constant, and the immersion position of the chamber portion 500 can be made constant so as to cover the bare water surface N.
Also, in this step, the chamber portion 500 is aligned on the bare water surface N, and the lower portion of the chamber portion 500 is immersed in the molten material M to cover the vicinity of the bare water surface N to form an inert atmosphere. In order to achieve this, the gas g introduced into the inside of the chamber 500 through the bare water surface N may be used, or another inert gas may be directly injected into the inside of the chamber 500, or The inside can be evacuated to form a vacuum atmosphere, or the like.
At this time, the step of forming a rotating flow and the step of forming a vacuum atmosphere or an inert atmosphere on the surface N may be sequentially performed in any order, and two steps may be performed simultaneously. Therefore, a strong rotational flow P _C is formed in the melt M to remove the inclusions S ′ and to prevent the melt M from being contaminated by the bare metal surface N generated by the rotational flow P _C. it can.

On the other hand, at least one of the time of formation of the rotational flow P _C, inducing member may be made different gas injection position of the gas injection section 400 with respect to the first member 20, the rotational speed and flow direction of the rotating flow P _C Can be controlled. For example, the separation distance W1 of the gas injection portion 400 with respect to the first member 20 is adjusted to make the gas injection position of the gas injection portion 400 different with respect to the first member 20, and the action of the Venturi effect by the first member 20 Ranges and sizes can be made different. Therefore, it is possible to adjust the flow direction and the rotational speed of the rotating flow P _C. At this time, the flow direction of separation as W1 is smaller rotational flow P _C of the gas injection section 400 with respect to the first member 20 is formed vertically along the first member 20, it is possible to increase the rotational speed.
Further, during the formation of the rotational flow P _C, in a manner of adjusting the immersion height of the chamber portion 500 for the melt M, to adjust the height of the second wall portion 530, the second wall to the second member 30 The separation distance d1 of the portion 530 can be adjusted. From this, the flow rate Q1 of the melt flowing toward the hole 14 by spouting the upper portion of the induction member and the flow toward the gas injection portion 400 by spouting the upper portion of the induction member are recovered in the rotational flow P _C The flow rate Q2 of the melt can be controlled respectively.

Therefore, it is possible to control the rotational speed of the rotating flow P _C, derived by rotating a plurality of times melt M in the vicinity of the member, it causes a long time staying significantly frequency of contact gas g for the melt M of the guide member near the To increase.
Furthermore, preference when forming the rotating flow P _C, the injection method of the gas g by the gas injection unit 400 is controlled by at least one method of continuous mode and intermittent mode, the flow of the rotational flow P _C of the guide member near the Control the flow of That is, while processing the melt M, continuously injecting a gas g, which controls a constant such as strength and the rotational speed of the rotating flow P _C against time. Or, during the processing of the melt M, or combined in a predetermined period, irregularly gas g intermittently injected, flow properties, such as strength and rotational speed of the rotating flow P _C changes according to the time , For example, can be controlled to have pulsatility.
Thus, the guide member gas g in various positions in the vicinity by spraying in a variety of ways, the flow characteristics of the rotating flow P _C formed near the guide member, for example, desired flow and flow direction and rotational speed The characteristics can be controlled in various ways.

Meanwhile, forming a rotating flow P _C, the second gas injection part via a (not shown), gas is injected into the interior of the container between the guide member and the gas injection unit 400, the flow of the rotational flow At least one of direction and rotational speed can be controlled.
For example, the gas g is injected into the inside of the container 10 between the first member 20 and the melt injection unit 400 via the gas injection unit 400, and the gas g is separated from the first member 20 on the opposite side of the gas injection unit 400. The gas is injected into the interior of the container 10 between the second member 30 and the first member 20 via the second gas injection portion (not shown) installed in the bottom portion 13 to rotate the melt P Control _C

At this time, at least one of the gas injection amount of the second gas injection part and the injection method is controlled to be different from at least one of the gas injection amount of the gas injection part 400 and the injection method to center the first member 20. In addition, the injection amount and the injection method of the gas g can be controlled differently on both sides in the longitudinal direction Y. From this, the flow of the melt M near the first member 20 can be variously controlled to the desired flow.
While the above steps are being carried out, inclusions are effectively removed from the melt M supplied into the container 10 to discharge the melt M into the hole 14, which is used as a mold provided under the hole 14 (see FIG. Casting into slabs (not shown) with not shown. Therefore, the quality of the slab during casting can be improved, and defects in the physical properties of the slab surface can be prevented.

FIG. 5 is a view showing the process of removing inclusions and the results according to an example of the present invention, wherein (a) is a steel that has been subjected to a characteristic experiment of injecting argon gas into molten steel and solidifying it; (B) is a photograph of the area of the solidified steel after expansion of the bubble of the solidified steel by the electron microscope after the above-mentioned characteristic experiment is carried out, and (c) is the photograph of the state of the cross section of The component around the bubble of solidified steel was detected with the electron microscope after implementation of the characteristic experiment of 3. In the graph of (c), the horizontal axis represents the spectrum of the energy intensity (keV) of X-rays detected by the electron microscope. Based on FIG. 5, the experimental process and the result of the characteristic experiment which can effectively capture and remove fine inclusions by injecting argon gas into molten steel will be described.
First, in order to carry out a characteristic experiment of collection and removal of inclusions in molten steel by argon gas, molten steel is provided, and argon gas is blown into the molten steel to solidify it. When the molten steel solidifies, the cross section of the solidified steel is observed with an electron microscope to form inclusions in the bubble portion and its periphery formed in the steel solidified by the injected argon gas, and its components are analyzed. The experimental process and the results are shown in (a) to (c) of FIG.

As a result of these characteristic experiments, bubbles of argon gas are formed in the solidified steel as shown in (a) of FIG. 5, and as shown in (b), fine inclusions of 30 .mu.m or less in size around the bubbles It could be confirmed that a considerable amount of C. is present, and further, from the result of its component analysis, the inclusion was found to be Al ₂ O ₃ . Thus, bubbles of argon gas can be used to effectively remove fine inclusions in the molten steel.
As described above, when bubbles of argon gas are injected into the molten steel, inclusions are attached to the interface, and the inclusions have the property of being attached to the side with lower interfacial tension. That is, since the interfacial tension of bubbles by argon gas is relatively lower than the interfacial tension of molten steel, inclusions can be collected at the bubble interface of argon gas.

At this time, in the embodiment of the present invention, in order to collect and remove the inclusions by using the collection and removal characteristic of inclusions in the molten steel by the argon gas, a predetermined region in the molten steel to which the argon gas is jetted the rotating flow P _C is formed, is rotated several times for the same molten steel can be contacted repeatedly with argon and high frequency of.
Therefore, fine inclusions having components such as Al ₂ O ₃ and SiO ₂ can be more effectively collected and removed from the molten steel. At this time, bubbles of argon gas having inclusions collected at the interface rise to the molten metal surface and escape to the outside of the molten steel, and the inclusions are adsorbed and removed by the slag layer.
As described above, in the embodiment of the present invention, inclusions can be smoothly collected and removed from the molten steel, and since it is possible to inject the molten steel in which the cleanliness to the inclusions is secured into the mold, this is continuous. If applied to the casting process, it is possible to prevent the defects in the physical properties of the mold and to reduce the clogging of the nozzle due to the inclusions. As a result, the slab quality in the continuous casting process can be improved, and the process stability and productivity can be increased.

FIG. 6 is a view showing a modeling result of a melt processing apparatus for flow analysis of a melt according to an embodiment of the present invention, and FIG. 7 is a flow analysis result of the melt according to an embodiment of the present invention FIG.
First, the internal structure of the melt processing apparatus was schematically modeled as shown in FIG. 6 for numerical analysis using computational fluid dynamics of the melt processing apparatus. At this time, in the modeled drawing, reference numeral 1 ′ denotes a melt injection portion, reference numeral 10 ′ denotes a container, and reference numeral 20 ′ denotes a first member. Further, the reference numeral 30 'is a second member, the reference numeral 400' is a gas injection part, and the reference numeral 500 'is a chamber. Reference numeral 70 'denotes a nozzle. In addition, drawing code P1 is the flow near the melt injection part, P2 is the flow of the melt near the nozzle, P ' _C is the flow of the melt near the first member, and V is the venturi effect Formation region of

Thereafter, predetermined analysis conditions are input, and the modeling result is numerically analyzed using Computational Fluid Dynamics (CFD). The analysis results are shown in FIG.
Based on FIGS. 6 and 7, as a result of the above-described numerical analysis, the flow direction of the melt is generated on the first member 20 'side in the melt injection portion 1' and the gas rising force in the gas injection portion 400 '. As a result, the flow of the melt rises along the first member 20 '. A portion of the elevated melt flow returns to the melt injection section 1 'side, and most of the elevated melt rotates from the first member 20' towards the third member 30 '. The molten material flowing toward the third member 30 ′ collides with the wall portion of the chamber portion 500 ′ and then moves downward, in this case, partially crossing the second member 30 ′, It escapes to the nozzle 70 'side, and the remainder advances continuously to the lower side of the wall portion. The melt advancing to the lower side of the wall portion is a first member 20 along the bottom of the container 10 'and on the side of the gas injection portion 400' due to the Venturi effect generated on the gas injection portion 400 '. Moving past the bottom of ', it can be seen that a rotational flow forms around the first member 20'.

In the chamber unit 500 according to an embodiment of the present invention, the shapes of the first wall unit 520 and the second wall unit 530 may be variously modified. Hereinafter, based on FIG. 8, the shapes of the first plurality of wall portions and the second plurality of wall portions of the chamber portion 500 according to the modified example of the present invention will be described in detail.
FIG. 8 is a partial view of a melt processing apparatus according to an embodiment and a modification of the present invention, wherein (a) is a partial view showing a chamber section according to an embodiment of the present invention; i) is a partial view showing a chamber part concerning a 1st modification thru / or a 8th modification in order.
On the other hand, in the drawing reference numerals shown on the drawings, "b" to "i" are used to distinguish the component according to each modification from the component of the embodiment. For example, reference numerals 510 b to 510 i in FIG. 8 are used to distinguish the lead according to each modification from the lead 510 of the embodiment. Also, reference numerals 520b to 520i are used to distinguish them from the first wall 520 of the embodiment of the first wall according to each modification, and reference numerals 530b to 530i indicate seconds according to each modification. It was used to distinguish it from the second wall portion 530 of the wall portion example.

Comparing (a) and (b) to (i) in FIG. 8, in the modification of the present invention, the shapes of the first wall portion and the second wall portion of the chamber portion may be different. The first wall portion may have a rectangular cross section as shown in (b), (c), (f), (g), (h) and (i) of FIG. It may be in the shape of a right triangle as in (d) and (e). When the vertical cross section is in the shape of a right triangle, the surface corresponding to the oblique side can be directed to the inside or the outside of the chamber portion.
In addition, the second wall portion 530 is provided on the upper surface 531, the lower surface 531 ′, the vertical surface 532, the curved surface 533, and the groove 534 on the other surface facing the first wall 520 and the other surface. At least one of can be formed. The specific shape is shown in (b) to (i) of FIG.
Thus, in the modification of the present invention, the shapes of the first wall portion 520 and the second wall portion 530 are partially or entirely different, and the flow characteristics of the melt passing through the respective wall portions are diversified. It can be adjusted. Therefore, the flow of the melt formed under the chamber 500 can be variously controlled to the desired flow.

FIG. 9 is a schematic view of a melt processing apparatus according to a comparative example of the present invention, and FIG. 10 is a photograph showing a processing result of the melt according to the comparative example of the present invention. It is a photograph which shows the result, after performing operation using the processing apparatus of the conventional molten material which concerns on the comparative example of this invention.
The conventional melt processing apparatus according to the comparative example of the present invention includes a tundish 81 containing a melt M 'and a slag S, a melt injection portion 1 positioned at the center of the tundish 81, and a melt injection. It comprises an upper bank 82 spaced from the section 1 to the steel outlet 84 side and a lower dam 83 spaced from the upper bank 82 to the steel outlet 84 side. Looking at the melt processing step using this, as indicated by the dotted arrows in the drawing, no rotational flow is formed inside the tundish 81 to cover the upper bank 82. After applying this to a continuous casting process and carrying out several operations, when looking at the slab manufactured therefrom, it was confirmed that interstitial physical defects were formed on the surface of the slab as shown in FIG. . This is because rotational flow and gas injection are not performed as in the embodiment of the present invention in which fine inclusions are floated and separated or collected and removed inside the tundish 81.

For example, when casting a molten metal, such as a continuous casting process, the cleanliness of the molten metal is an important factor that determines the quality of the cast product. In the case of a continuous casting process, aluminum or silicon used in the deoxidation step of the melt M 'reacts with oxygen in the molten steel and is mostly removed as inclusions, but inclusions of very small size are , Will remain in the molten steel. Such inclusions cause clogging of the immersion nozzle of the tundish 81 in the continuous casting process and not only prevent the injection of molten steel into the mold, but are also mixed during the solidification step in the slab as shown in FIG. As in the case, it may cause defects in the inclusions themselves. Such inclusions are removed by various methods, but in the case of inclusions of 30 μm or less, the upper bank 82 and the lower dam 83 have a limit in floatation and separation using the flow of the melt M ' .
Conversely, according to the embodiment of the present invention, as a measure for maximizing the removal efficiency of inclusions, for example, argon gas is injected into the melt to form a rotary flow. At this time, the injection position of the argon gas is adjusted to maximize the formation of the rotational flow, and the chamber portion is provided on the first member, for example, the weir so as to prepare for the generation of the bare surface generated by the rotation and the argon gas injection. Set up. Therefore, a strong rotational flow is formed in the melt and repeatedly contacted with the argon gas to form an inert atmosphere on the surface of the hot water by the strong rotational flow and the argon gas injection while effectively removing the inclusions. Contamination of the melt can be prevented.

  The embodiments of the present invention are for the purpose of illustration of the present invention, and are not for the limitation of the present invention. In addition, the plurality of configurations and methods presented in the embodiments of the present invention may be combined or cross-applied to each other to be transformed into various different forms, and the plurality of modifications may be the present invention. It can be viewed as a category of As a result, the present invention can be embodied in various different forms within the scope of the claims and technical ideas equivalent thereto, and those skilled in the art to which the present invention falls can understand the present invention. It can be understood that various embodiments are possible within the scope of the idea.

1, 1 ': Melt injection part 10, 10': Container 11: Width direction both side wall 12: Length direction both side wall 13: Bottom part 14: Hole 20: 20 '1st member 30, 30': 2nd member 60 : Gate 70, 70 ': Nozzle 81: Tundish 82: Upper bank
83: Lower dam 84: Steel outlet 400, 400 ': Gas injection part 410: Gas injection pipe 420: Control valve 500, 500': Chamber part 510: Lead part 511: Flange part 520: First wall part 530: Second wall portion 531: upper inclined surface 531 ': lower inclined surface 532: vertical surface 533: curved surface 534: recessed groove 540: first operating portion 550: second operating portion 560: supply pipe 570: exhaust pipe C: ( Near the bare surface N) d1: Separation distance g: Gas N: The bare surface
M, M ′: melt P1: flow (in the vicinity of the melt injection portion) P2: flow (in the melt near the nozzle) Pc: rotational flow P ′ _C : flow (in the melt near the first member) Q1, Q2: Melt flow rate S: Slag S ^' : Inclusion V: Formation area of venturi effect W1: Separation distance X: Width direction Y: Length direction Z: Height direction

Claims (26)

A container, the inside of which is open at the top, the melt injection part provided at the top, and a hole formed on at least one side of the bottom;
An induction member spaced apart from the melt injection portion toward the hole;
An apparatus for processing a molten material, comprising: a gas injection unit spaced from the induction member toward the melt injection unit and installed at the bottom. The guiding member is
The apparatus for processing molten material according to claim 1, further comprising a first member spaced apart from the molten material injection part to the hole side and spaced apart from the bottom part. The guiding member is
The apparatus for processing molten material according to claim 2, further comprising a second member spaced from the first member to the hole side and installed in contact with the bottom portion. The gas injection unit
The melt according to claim 3, wherein the melt is separated from the first member toward the melt injection portion, or is separated from the second member toward the first member. Processing unit.   The chamber portion is extended in the width direction, the inside is released downward, and is provided at the upper portion of the container so as to face the induction member and the gas injection portion. Apparatus for processing a melt according to any one of the preceding claims.   The plurality of guiding members, the gas injection part, the chamber part, and the holes are respectively provided, and are located on both sides in the longitudinal direction centering on the melt injection part. Apparatus for processing melts as described. The gas injection unit
The melt processing apparatus according to any one of claims 2 to 4, wherein the melt processing apparatus is extended in the width direction, protrudes from the upper surface of the bottom, and has a height lower than that of the lower surface of the first member. The gas injection unit
The melt processing apparatus according to any one of claims 2 to 4, wherein the melt processing unit is positioned relatively closer to the first member than the melt injection portion. The gas injection unit
A block disposed on the bottom and having a slit formed on the top surface;
A gas injection pipe communicating with the slit;
The melt processing apparatus according to any one of claims 1 to 4, further comprising: a control valve mounted on the gas injection pipe and controlling an opening degree and an opening / closing method of the gas injection pipe. . The chamber unit is
A lead portion extended in the width direction,
It is extended in the width direction and is separated on both sides in the length direction around the first member, and is attached to the lower surface of the lead portion respectively and is contacted to or separated from the longitudinal side walls of the container And several wall parts,
The melt according to claim 5, further comprising: a plurality of flange portions extended in the length direction and attached to both side edges of the lead in the width direction and connecting the plurality of wall portions. Processing unit. The plurality of wall sections are
A first wall portion positioned to be separated from the gas injection portion to the melt injection portion side;
The apparatus for processing a melt according to claim 10, further comprising: a second wall portion spaced apart above the second member.   12. The first wall portion according to claim 11, wherein a lower surface of the first wall portion is formed higher in height than an upper surface of the first member, and the first wall portion is immersible by the molten material injected into the inside of the container. Melt processing equipment.   The lower surface of the second wall portion is formed to be lower in height than the upper surface of the first member, and the second wall portion is immersible by the melt injected into the inside of the container. Melt processing equipment.   The melt according to claim 11, wherein the second wall portion is formed at least one of a slope, a vertical surface, a curved surface, and a groove on a surface facing the first wall portion. Processing unit.   A supply pipe formed to supply gas and communicating with the inside through the chamber, and an exhaust pipe formed to communicate with the inside and communicating with the inside through the chamber; The apparatus for processing a melt according to claim 5, wherein at least one of them is included.   The first operating unit that supports the chamber unit so as to move up and down, and adjusts the height of the chamber unit according to the height of the upper surface of the melt injected into the container, and the chamber unit can slide And at least one of a second operation unit for adjusting the position of the chamber portion in the length direction according to the generation position of the surface of the molten metal injected into the container and supported by the An apparatus for processing a melt according to claim 5, comprising   5. The apparatus of claim 4, further comprising: a second gas injection part spaced from the first member on the opposite side of the gas injection part and installed at the bottom.   5. The melt according to any one of claims 1 to 4, wherein the melt injection portion is formed to allow passage of molten steel and detachably mounted to a ladle of a continuous casting facility. Processing unit.   The apparatus for processing a molten material according to any one of claims 1 to 4, wherein the gas injected into the interior of the vessel via the gas injection part contains an inert gas. Preparing a container with the inside open to the top, a hole at the bottom, a melt injection at the top, and a guiding member between the hole and the melt injection;
Injecting the melt into the interior of the vessel;
Spouting the melt onto the top of the guiding member;
Injecting a gas into the interior of the vessel between the induction member and the melt injection portion via a gas injection portion to form a rotational flow of the melt. Method.   21. The method according to claim 20, further comprising the step of forming a vacuum atmosphere or an inert atmosphere in a region covering a generation position of a bare water surface of the melt by the gas injected into the inside of the container using a chamber part. The method of processing a melt as described in. The step of forming the rotational flow comprises
The method as set forth in claim 20, further comprising controlling at least one of the flow direction and the number of rotations of the rotational flow by adjusting a gas injection position of the gas injection unit with respect to the induction member. How to handle the melts of The step of forming the rotational flow comprises
21. The method according to claim 20, further comprising the step of controlling the gas injection method by the gas injection unit according to at least one of a continuous method and an intermittent method. The step of forming the rotational flow comprises
The immersion height of the chamber part with respect to the melt is adjusted to jet the upper portion of the induction member, and the flow rate of the melt flowing to the hole side and the upper portion of the induction member are jetted to control the gas 22. A method according to claim 21, further comprising the steps of: controlling the flow rate of the melt flowing to the injection portion side. The step of forming the rotational flow comprises
Injecting a gas into the container between the gas injection unit and the induction member via a second gas injection unit, and controlling at least one of the flow direction and the number of rotations of the rotational flow 21. A method of treating a melt according to claim 20, characterized in that. The melt comprises molten steel,
26. A method according to any one of claims 20-25, wherein the gas comprises an inert gas.