WO2021112267A1

WO2021112267A1 - Molten material mixing apparatus and method

Info

Publication number: WO2021112267A1
Application number: PCT/KR2019/016861
Authority: WO
Inventors: 김용환
Original assignee: 주식회사 포스코
Priority date: 2019-12-02
Filing date: 2019-12-02
Publication date: 2021-06-10

Abstract

The present invention relates to a molten material mixing apparatus and, more specifically, to a molten material mixing apparatus for mixing molten material accommodated in a container. According to one embodiment of the present invention, the molten material mixing apparatus comprises: a container having an inner space formed for accommodating molten material therein; a tunnel portion formed below and outside the inner space so as to form a tunnel to draw the molten material from the inner space and circulate same; and a gas supply unit for supplying gas to the tunnel portion.

Description

Melt Stirring Apparatus and Method

The present invention relates to a melt stirring apparatus and method, and more particularly, to a melt stirring apparatus and method for stirring a melt contained in a vessel.

Molten iron produced in the blast furnace has a high carbon (C) content and contains impurities such as phosphorus (P) and sulfur (S). It goes through a bubbling process.

In general, in the bubbling process, a porous plug is installed at the bottom of the ladle, and an inert gas such as nitrogen or argon is blown into the molten steel through the porous plug to agitate the molten steel. of clean steel.

As such, when removing the non-metallic inclusions present as impurities in the molten steel through the bubbling process, it is very important to move the inclusions to the surface of the molten steel to increase the contact probability with slag. As such, the contact probability between the inclusions and the slag may be determined by the stirring speed of the molten steel and the range of the stirring force.

In order to increase the stirring speed in the stirring process and to widen the range of the stirring force, a method of increasing the flow rate of the inert gas supplied from the porous plug is generally considered. However, when the flow rate of the inert gas is simply increased, the surface of the molten steel is cracked at the top of the porous plug to which the inert gas is supplied, and fragments of the slag existing on the surface of the molten steel are mixed into the molten steel and become inclusions.

Accordingly, in order to minimize the size of the pot and prevent the slag from mixing with the molten steel, the supply amount of the inert gas must be adjusted to a minimum. However, when the supply amount of the inert gas is minimized as described above, the entire molten steel accommodated in the ladle is not stirred due to the supply amount of the weak inert gas, and the molten steel is stagnated in a certain area, so that the non-metallic inclusions in the molten steel cannot be effectively removed. .

(Prior art literature)

KR10-2007-0064780A

SUMMARY OF THE INVENTION The present invention provides a melt stirring apparatus and method capable of minimizing the area where the melt stagnates upon stirring of the melt.

Melt stirring apparatus according to an embodiment of the present invention, a vessel in which an inner space for accommodating the melt is formed; a tunnel portion formed outside the lower portion of the inner space to form a path for sucking and circulating the melt from the inner space; and a gas supply unit for supplying gas to the tunnel unit.

The tunnel portion may be formed in the bottom of the container and communicate with the inner space in a central region and an edge region of the bottom.

The tunnel part may include: a first hole formed by being recessed from an upper surface of the floor in a central region of the floor; a second hole formed by being recessed from an upper surface of the floor in an edge region of the floor; and a passage formed to communicate the first hole and the second hole with each other in the floor.

A plurality of the second holes may be formed along an edge region of the floor, and the passage may allow the plurality of second holes to communicate with the first hole, respectively.

The second hole may be formed in an outermost region of the bottom body connected to the wall of the container.

It may further include a; outlet formed through the bottom body for discharging the melt, and the tunnel unit, a discharge path for communicating the outlet and the passage with each other; may further include.

The gas supply unit may supply gas to the first hole.

The gas injection port of the gas supply unit may be formed in an inner wall of the first hole.

The gas injection hole may be formed in plurality, and the plurality of gas injection holes may be radially disposed on the inner wall of the first hole.

In addition, the melt stirring method according to an embodiment of the present invention, the process of charging the melt into the inner space of the container; and supplying a gas to the melt to agitate the melt; includes, wherein the stirring of the melt includes a process of sucking and circulating the melt through a path formed outside the lower part of the inner space. .

In the process of sucking and circulating the melt, the melt may be sucked and passed into the bottom of the container.

The process of sucking and circulating the melt may include: sucking the melt from the edge region of the inner space into the inside of the floor; and discharging the sucked melt to a central region of the inner space by moving it inside the bottom body.

In the process of discharging to the central region of the inner space, the molten material may be discharged by supplying a gas to the path.

The process of discharging the molten material charged into the inner space; further comprising, in the discharging of the melt, the melt accommodated in the path may be discharged together with the melt accommodated in the inner space.

The melt may include molten steel, and the container may include a ladle in which the molten steel is charged.

According to the melt stirring apparatus and method according to an embodiment of the present invention, the stirring efficiency can be improved by circulating the melt through the tunnel formed outside the lower inner space of the container.

In addition, by sucking the melt at the edge region of the inner space of the vessel by circulation of the melt through the tunnel portion, the stagnant area of the melt can be minimized without increasing the flow rate of the inert gas supplied for stirring the melt.

1 is a view showing a state in which the melt is stirred by the melt stirring device according to an embodiment of the present invention.

Figure 2 is a view schematically showing the state of the melt stirring device according to an embodiment of the present invention.

Figure 3 is a view schematically showing the bottom of the container according to the embodiment of the present invention.

Figure 4 is a view showing a state that the melt flows along the tunnel according to an embodiment of the present invention.

5 is a view showing a state that the melt is discharged along the discharge path according to an embodiment of the present invention.

6 is a view schematically showing a method for stirring a melt according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only the embodiments of the present invention allow the disclosure of the present invention to be complete, and the scope of the invention to those of ordinary skill in the art It is provided to fully inform In the drawings, like reference numerals refer to like elements.

1 is a view showing a state in which the melt is stirred by the melt stirring device according to an embodiment of the present invention. In addition, Figure 2 is a view schematically showing the state of the melt stirring device according to an embodiment of the present invention, Figure 3 is a view schematically showing the bottom of the container according to an embodiment of the present invention. Here, FIG. 3 shows a view from the top of the melt stirring device shown in FIG. 2 .

1 to 3, the melt stirring device according to an embodiment of the present invention is a vessel in which an inner space (I) for accommodating the melt is formed, and the melt is sucked from the inner space (I) to circulate. and a tunnel 200 formed outside the lower portion of the inner space I to form a path, and a gas supply unit 300 for supplying gas to the tunnel 200 .

Here, the melt includes the molten steel M from which impurity elements are primarily removed from the molten iron, and the container may include a ladle 100 for accommodating the molten steel. Hereinafter, the container will be described as corresponding to the ladle 100 for accommodating the molten steel, but the container is not limited thereto and applicable to any type of container for stirring the melt accommodated in the inner space (I). Of course it is possible.

In general, the removal of impurities in the molten steel (M) is made in such a way that the non-metallic inclusions in the molten steel (M) are moved to the surface of the molten steel (M) and brought into contact with the slag (S) floating on the surface of the molten steel (M).

As shown in FIG. 1(a), the conventional melt stirring device installs a porous plug 40 in the center of the bottom of the ladle 10, and uses an inert gas such as nitrogen or argon through the porous plug 40 for molten steel. The molten steel (M) is stirred by blowing into it.

Here, the inert gas supplied from the porous plug 40 rises by receiving buoyancy due to a specific gravity difference with the molten steel M, and a strong upward airflow occurs in the central region of the molten steel M accommodated in the ladle 10. will do This upward airflow of the inert gas forms a surface airflow of the molten steel M that spreads from the surface of the molten steel M toward the edge area, and the surface airflow hits the wall of the ladle 10 and moves downward from the edge area. A weak downdraft of the formed molten steel M is generated.

That is, as the molten steel M rises from the central region, passes through the surface and descends to the edge region, the strength of the flow gradually decreases. As a result, the stirring force does not reach the lower portion of the edge region of the molten steel M. A stagnant region P with little flow of (M) is formed. The stagnant region P can be reduced by increasing the flow rate of the inert gas supplied from the porous plug 40, but when the flow rate of the inert gas is simply increased, there is a high probability that the molten steel M surface will become loose. becomes large, which causes a problem in that the fragments of the slag (S) present on the surface of the molten steel (M) are mixed into the molten steel and become inclusions.

On the other hand, the melt stirring device according to the embodiment of the present invention, as shown in Figure 1 (b), the path for circulating by sucking the molten steel (M) from the lower outside of the inner space (I) of the ladle (100) The tunnel part 200 is formed to form. Here, the molten steel (M) sucked from the lower outside of the inner space (I) of the ladle (100) passes through the tunnel part (200) and is discharged into the inner space (I) and circulated. According to the movement of the molten steel M in the tunnel 200, the molten steel M accommodated in the inner space I of the ladle 100 is sucked from the edge region of the inner space I, It is possible to minimize the stagnant area (P) of the molten steel without increasing the flow rate.

With respect to the configuration and operation of the melt stirring device according to an embodiment of the present invention, it will be described in more detail below.

The ladle 100 has an internal space (I) for accommodating the molten steel (M) is formed. The ladle 100 may be divided into a floor 120 and a wall 110 extending upward from the floor 120, and the floor 120 and the wall 110 are made of molten steel (M). to form an internal space (I) for accommodating it. Here, in order to accommodate the high-temperature molten steel (M) therein, the floor 120 and the wall 110 may be formed by constructing a shell on the shell and the inner wall of the shell. Hereinafter, the ladle 100 includes a bottom body 120 formed in a disk-shaped shape having a thickness, and a wall 110 extending upwardly from the outer periphery of the bottom body 120, the upper surface of which is an opening Although a structure formed in a cylindrical shape will be described as an example, the shapes of the floor 120 and the wall 110 are not limited thereto, and may be applied by changing variously.

The tunnel unit 200 forms a path for circulating the molten steel M by suction from the inner space (I) at the lower outside of the inner space (I) of the ladle (100). Here, the tunnel part 200 may be formed as at least one space formed outside the lower portion of the inner space (I). At least a part of the tunnel unit 200 may be formed in the floor body 120 . That is, a portion of the tunnel unit 200 may be formed in the floor 120 by a pipe that passes through the floor 120 and extends to the lower portion of the ladle 100 . However, in order to be easily seated on a torpedo car (not shown) for transport, etc., it is preferable that a separate structure is not disposed at the lower portion of the ladle 100, and the tunnel unit 200 is entirely floored. It may be formed inside the sieve 120 .

In this case, the tunnel 200 may communicate with the inner space I of the ladle 100 in the central region and the edge region of the floor 120 . Here, the central region refers to an area within a radius of a predetermined length from the central axis of the ladle 100 formed in a cylindrical shape, and the edge region refers to the outside of the central region to the wall 110 of the ladle 100 area within the radius of For example, the central region may be a region within a radius corresponding to 1/2 of the distance from the central axis of the ladle 100 to the wall 110, and the edge region is the wall of the ladle 100 to the outside of the central region. It may be an area within a radius of up to (110). In this case, a part of the inner space (I) positioned in the central region is defined as the central region of the inner space (I), and a part of the inner space (I) positioned in the edge region is defined as the edge region of the inner space (I), and the center A part of the floor body 120 positioned in the area is defined as a center region of the floor body 120 , and a part of the floor body 120 positioned in the edge region is defined as an edge region of the floor body 120 .

In order for the tunnel part 200 to communicate with the inner space I of the ladle 100 in the central region and the edge region of the floor body 120 , the tunnel part 200 is formed in the central region of the floor body 120 . A first hole 230 formed by being recessed from the upper surface of the floor 120 to a predetermined depth, and a second hole 230 formed by being depressed to a predetermined depth from the lower surface of the floor 120 in an edge region of the floor 120 . A passage 220 through which the first hole 230 and the second hole 210 communicate with each other may be included in the hole 210 and the bottom body 120 . For example, the first hole 230 and the second hole 210 may be formed by being recessed from the upper surface of the bottom body 120 to a depth within about 1/3 of the thickness of the bottom body 120, The passage 220 extends from the lower ends of the first hole 230 and the second hole 210 to have a height within about 1/3 of the thickness of the bottom body 120 to extend the first hole 230 and the second hole 230 . The holes 210 may communicate with each other.

As described above, the bottom body 120 may be formed in a disk-shaped shape having a thickness. Here, one surface of the bottom body 120 in contact with the molten steel M forms an upper surface of the bottom body 120 , and one surface of the bottom body 120 exposed to the outside forms a lower surface of the bottom body 120 . . In this case, the first hole 230 may be formed by being depressed from the upper surface of the floor body 120 to a depth that does not penetrate the floor body 120 in the central region of the floor body 120 . Also, the first hole 230 may be located in the bottom body 120 on the central axis, and in this case, the molten steel M may be symmetrically stirred around the central axis. As will be described later, the gas supply unit 300 supplies gas to the first hole 230 , and the molten steel M in the first hole 230 is discharged into the inner space I by the gas rising by the buoyancy force. to form an updraft.

The second hole 210 may be formed by being depressed from the upper surface of the floor body 120 to a depth that does not penetrate the floor body 120 in the edge region of the floor body 120 . Here, the second hole 210 may be formed in the outermost region of the floor body 120 connected to the wall 110 of the ladle 100 . As described above, the molten steel M forms a stagnant region P under the edge region of the inner space, and the second second in the outermost region of the bottom body 120 where the molten steel M forms the weakest airflow. By forming the hole 210 , the formation of the stagnant region P can be minimized.

When the molten steel M in the first hole 230 is discharged into the inner space I, the molten steel M in the second hole 210 fills the space in which the molten steel M flows out in the first hole 230 . For this purpose, it moves into the first hole 230 via the passage 220 . At this time, the space from which the molten steel M flows in the second hole 210 is filled by the molten steel M located in the edge region of the inner space I, and thereby the edge area of the inner space M The molten steel M located in the second hole 210 is sucked to form a downdraft.

A plurality of second holes 210 may be formed along an edge region of the bottom body 120 . As described above, the second hole 210 serves to suck the molten steel M located in the edge region of the inner space I. Accordingly, by forming the plurality of second holes 210 , the molten steel M positioned in the edge region of the inner space I can be sucked into the tunnel 200 as a whole. In this case, the plurality of second holes 210 may be positioned at equal intervals along the edge region of the floor body 120 , and in this case, the second holes 210 are positioned along the edge region of the inner space I by the second hole 210 . The molten steel M may be uniformly sucked into each of the second holes 210 . Although the drawing illustrates a configuration in which three second holes 210 are formed along the edge region of the bottom body 120 as an example, the second holes 210 may be formed in various numbers of two or four or more. of course there is

The passage 220 may communicate the first hole 230 and the second hole 210 in the floor 120 with each other. Here, the passage 220 connects the first hole 230 forming the updraft and the second hole 210 forming the downdraft to circulate the molten steel M together with the inner space I. will form The passage 220 is connected to the lower end of the first hole 230 in the bottom body 120 to prevent the molten steel M from remaining in the first hole 230 and the second hole 210 without being circulated. The lower ends of the second holes 210 may be connected to each other. In addition, as described above, when a plurality of second holes 210 are formed along the edge region of the bottom body 120 , the passage 220 is formed at the lower end of the plurality of second holes 210 through the first hole ( 230) may be formed to communicate with the lower end.

The melt stirring apparatus according to an embodiment of the present invention may further include a tap hole 130 for ejecting the molten steel M to tap it. The tap-hole 130 is formed through the bottom body 120 , and a gate 400 capable of opening or closing the tap-hole 130 may be installed at a lower end of the tap-hole 130 . Here, the gate 400 may include a sliding gate in which the plurality of plates move in opposite directions to open or close the tap opening 130 .

When the molten steel M is charged into the ladle 100 and the molten steel M accommodated in the inner space I of the ladle 100 is stirred, the tap hole 130 is closed by the gate 400 . Then, when the stirring of the molten steel (M) in the ladle 100 is finished, the molten steel (M) in the ladle 100 needs to be tapped into another container. Accordingly, the tap-hole 130 is opened by the gate 400 , and the molten steel M accommodated in the inner space I is discharged to the outside through the tap-hole 130 .

In this case, the tunnel unit 200 may further include a discharge path 250 for communicating the outlet 130 and the passage 220 with each other. That is, the tunnel part 200 is formed in the bottom body 120 to communicate with the internal space I of the ladle 100, and the molten steel M sucked from the internal space I in the tunnel part 200 is this is accepted Here, when the molten steel M accommodated in the tunnel part 200 is not discharged when tapping, the molten steel M may be solidified in the tunnel part 200, and the molten steel M accommodated in the tunnel part 200 also It is necessary to discharge from the tap hole 130 together with the molten steel M accommodated in the inner space (I).

Accordingly, the discharge path 250 communicates with the tap hole 130 and the passage 220 in the bottom body 120 , so that when the molten steel M is tapped through the tap hole 130 , it is in the tunnel part 200 . A path through which the accommodated molten steel M is discharged to the tap hole 130 may be formed. The discharge passage 250 may be formed to be inclined downwardly from the passage 220 toward the tap 130 , whereby the molten steel M accommodated in the tunnel 200 is smoothly discharged to the tap 130 . be able to Although the drawing shows a structure in which one passage 220 is connected to the outlet 130 through the outlet path 250 , the outlet path 250 connects a plurality of passages 220 to the outlet 130 , respectively. Needless to say, it may have various structures such as connecting to, or connecting to, the outlet 130 via a plurality of passages 220 , respectively.

Here, in the drawings, the shapes of the first hole 230 , the second hole 210 , the passage 220 , and the discharge passage 250 are exemplarily shown. Accordingly, the shapes of the first hole 230 , the second hole 210 , the passage 220 , and the discharge passage 250 are not limited thereto, and may be formed in various shapes to form a space through which the molten steel M flows. Of course you can.

The gas supply unit 300 is installed on at least one side of the tunnel unit 200 to supply an inert gas such as nitrogen or argon to the tunnel unit 200 . Here, the gas supply unit 300 may supply gas to the first hole 230 formed in the central region of the floor body 120 , and when the tunnel unit 200 is formed in the floor body 120 , the gas supply unit At least a portion of the reference numeral 300 may be embedded in the floor 120 so that the gas supply end is exposed to the first hole 230 .

Here, the gas supply unit 300 includes a porous plug penetrating through the bottom body 120 at the lower portion of the first hole 230 or penetrating the floor body 120 at the lower portion of the first hole 230 . Of course, it may include a tubular nozzle extending into the hole 230 . However, when the porous plug is disposed in the lower portion of the first hole 230, a portion of the gas supplied from the porous plug is supplied to the second hole 210 through the passage 220, so that an airflow in the reverse direction may be formed. have. This is the same even when a tubular nozzle is disposed under the first hole 230 . In addition, in the case of forming a tubular nozzle disposed under the first hole 230 to extend to the upper portion of the passage 220 in order to prevent such reverse airflow, the nozzle is formed by the high-temperature molten steel M. The extended portion may be melted away.

Accordingly, the gas supply unit 300 may supply gas to the first hole 230 from the side of the first hole 230 . That is, the gas supply unit 300 may be installed such that an end supplying gas, for example, a gas injection hole, is formed in the inner wall of the first hole 230 . In this case, the gas supply unit 300 may be installed at least partially buried in the floor body 120 so that only the gas injection port is exposed to the inner wall of the first hole 230 in order to prevent dissolution loss.

As such, a plurality of gas injection ports of the gas supply unit 300 may be formed. That is, a plurality of nozzles may be connected to an end of the gas supply unit 300 for supplying a gas, and in this case, the gas injection holes respectively formed in the plurality of nozzles may be disposed on the inner wall of the first hole 230 in a manner. have. That is, when the gas injection hole is formed in one inner wall of the first hole 240 to supply gas from the side of the first hole 230 , the molten steel M in the first hole 230 is directed in the direction in which the gas is supplied. It is biased to form an updraft. Accordingly, in order to form a stable upward airflow in the vertical direction from the first hole 230 , a plurality of gas injection holes are radially disposed along the circumference of the first hole 230 to supply gas to the first hole 230 , , in this case, the plurality of gas injection holes may be arranged to have the same spacing along the circumference of the first hole 230 .

4 is a view showing a state that the melt flows along the tunnel according to the embodiment of the present invention, Figure 5 is a view showing the state that the melt is discharged along the discharge path according to the embodiment of the present invention. Here, FIG. 4 shows a cross-section of the floor shown in FIG. 3 cut in the A-A' direction, and FIG. 5 is a cross-sectional view of the floor shown in FIG. 3 cut in the B-B' direction.

Referring to FIG. 4 , when the inert gas is supplied from the side of the first hole 230 from the gas supply unit 300 in a state where the molten steel M is accommodated in the inner space I of the ladle 100, the supplied gas and The molten steel in the first hole 230 is discharged into the inner space I by the specific gravity difference with the molten steel M to form a strong upward airflow. In this case, as described above, in the gas supply unit 300 , the plurality of gas injection holes may be radially disposed along the circumference of the first hole 230 in order to prevent the upward airflow from being biased in the direction in which the gas is supplied.

When the molten steel M is released from the first hole 230 into the inner space I by the gas supplied to the first hole 230 , the space in which the molten steel M is discharged in the first hole 230 is closed. In order to fill the molten steel M accommodated in the passage 220 is moved to the first hole 230 . In addition, the molten steel M accommodated in the second hole 210 also flows into the passage 220 in order to fill the space in which the molten steel M in the passage 220 is leaked. In this case, the second hole 210 sucks the molten steel M located in the edge region of the inner space I to fill the space in which the molten steel M flows out in the second hole 210 . Accordingly, the molten steel M forms a strong downdraft in the edge region, thereby preventing the stagnant region P from being generated under the edge region.

The flow of the molten steel M may be equally applied to each of the second holes 210 when the plurality of second holes 210 are formed at equal intervals along the edge region of the bottom body 120 . From this, the molten steel M positioned along the edge region of the inner space I may be uniformly sucked into each of the second holes 210 and stirred.

When the stirring of the molten steel (M) is finished, the molten steel (M) accommodated in the ladle 100 should be tapped to the outside. Accordingly, as shown in FIG. 5 , the gate 400 installed in the tap 130 is opened, and the molten steel M accommodated in the internal space I is discharged through the tap 130 and at the same time the tunnel part ( The molten steel M accommodated in the 200 may also be discharged to the tap hole 130 through the discharge path 250 . Here, the discharge path 250 may be formed to be inclined downwardly from the passage 220 toward the tap 130 so that the molten steel M accommodated in the tunnel 200 is smoothly discharged to the tap hole 130 . As described above.

Hereinafter, a method for stirring a melt according to an embodiment of the present invention will be described in detail. However, in the description of the melt stirring method according to the embodiment of the present invention, the description overlapping with the above in relation to the melt stirring apparatus according to the embodiment of the present invention will be omitted.

Referring to Figure 6, the melt stirring method according to an embodiment of the present invention is the process of charging the melt into the inner space (I) of the container (S100) and the process of supplying a gas to the melt to stir the melt (S200) Including, the process of stirring the melt (S200) includes a process of sucking the melt into a path formed outside the lower portion of the inner space (I) and circulating it.

Here, the melt includes the molten steel M from which impurity elements are primarily removed from the molten iron, and the container may include a ladle 100 for accommodating the molten steel, as described above.

The process (S100) of charging the molten steel (M) into the inner space (I) of the ladle (100), for example, the molten steel (M) tapped from the converter is charged into the inner space (I) of the ladle (100). Here, the ladle 100 may be divided into a floor 120 and a wall 110 extending upward from the floor 120, and the floor 120 and the wall 110 are molten steel (M). ) to form an internal space (I) for accommodating it.

In the process (S200) of supplying gas to the molten steel (M) to stir the molten steel (M), an inert gas such as nitrogen or argon is supplied to the molten steel (M) to stir the molten steel (M). At this time, the process (S200) of stirring the molten steel (M) is to minimize the formation of the stagnant area (P) under the edge area of the inner space (I) of the ladle (100), the lower outer side of the inner space (I) It includes the process of circulating by sucking the molten steel (M) to the path formed in the.

Here, the path formed outside the lower portion of the inner space (I) is formed by the aforementioned tunnel unit 200 . That is, the tunnel unit 200 forms a path for sucking and circulating the molten steel (M) from the inner space (I) in the lower outer side of the inner space (I) of the ladle (100), the tunnel unit 200 is the inner space It may be formed with at least one space formed outside the lower part of (I).

Here, in the process of sucking and circulating the molten steel M, the molten steel M may be sucked and passed into the bottom body 120 of the ladle 100. In addition, the process of sucking and circulating the molten steel M is the process of sucking the molten steel M into the inside of the bottom body 120 in the edge region of the inner space I (S210) and the sucked molten steel M) may include a process (S220) of discharging to the central region of the inner space (I) by moving the inside of the bottom body (120) (S220).

As described above, the tunnel part 200 is formed by being recessed from the upper surface of the floor body 120 in the central region of the bottom body 120 , and in the edge region of the first hole 230 , the bottom body 120 . A second hole 210 formed by being depressed from the lower surface of the bottom body 120 and a passage 220 for communicating the first hole 230 and the second hole 210 in the bottom body 120 with each other. may include.

In this case, the first hole 230 may be formed by being depressed from the upper surface of the floor body 120 to a depth that does not penetrate the floor body 120 in the central region of the floor body 120 . Here, the gas supply unit 300 supplies the gas to the first hole 230 , and the molten steel M in the first hole 230 is discharged into the inner space I by the gas rising by the buoyancy force and rises. form an air current

Also, the second hole 210 may be formed by being recessed downward from the upper surface of the floor body 120 to a depth that does not penetrate the floor body 120 in the edge region of the floor body 120 . Here, when the molten steel M in the first hole 230 is discharged into the inner space I, the molten steel M in the second hole 210 is the space in which the molten steel M flows out in the first hole 230 . It moves into the first hole 230 via the passage 220 in order to fill it. At this time, the space in which the molten steel M is leaked in the second hole 210 is filled by the molten steel M located in the edge region of the inner space I, and the molten steel M in the edge region of the inner space Silver can be sucked into the interior of the bottom body (120).

On the other hand, the molten steel (M) sucked into the interior of the floor body 120 in the edge region of the inner space passes through the passage 220 again as the molten steel M in the first hole 230 is discharged into the inner space (I). It moves into the first hole 230 via the . Accordingly, the molten steel M sucked from the second hole 210 may move inside the bottom body 120 and be discharged to the central region of the inner space I. At this time, the process (S220) of discharging the sucked molten steel M to the central region of the inner space I may be performed by supplying gas to a path formed outside the lower portion of the inner space I, and the gas supply unit 300 ) from the molten steel M in the first hole 230 by the buoyancy of the gas supplied to the first hole 230 is discharged into the inner space (I).

In addition, the melt stirring method according to an embodiment of the present invention may further include a process (S300) of discharging the molten steel (M) charged into the internal space (I).

For example, when the stirring of the molten steel (M) is finished, the molten steel (M) charged and accommodated in the ladle 100 must be tapped to the outside. At this time, when the molten steel M accommodated in the tunnel part 200 is not discharged when the steel is tapped, the molten steel M may be solidified in the tunnel part 200, and the molten steel M accommodated in the tunnel part 200 also It is necessary to discharge from the tap hole 130 together with the molten steel M accommodated in the inner space (I).

Therefore, in the process (S300) of discharging the molten steel M, the molten steel M accommodated in the tunnel 200, that is, the molten steel M accommodated in the path formed outside the lower portion of the inner space I, is accommodated in the inner space I. ) can be discharged with That is, the discharge path 250 formed to communicate the tap hole 130 and the passage 220 in the floor 120 is the tunnel part 200 when the molten steel M is tapped through the tap hole 130 . ) may form a path through which the molten steel (M) accommodated in the outlet is discharged to the tap hole (130). At this time, the discharge passage 250 may be formed to be inclined downwardly from the passage 220 toward the tap hole 130 , whereby the molten steel M accommodated in the tunnel part 200 flows smoothly into the tap hole 130 . can be discharged.

As described above, according to the melt stirring apparatus and method according to an embodiment of the present invention, stirring efficiency is increased by circulating the molten steel M through the tunnel 200 formed outside the lower inner space I of the ladle 100 . can be improved

In addition, the flow rate of the inert gas supplied for stirring of the molten steel M is increased by sucking the molten steel M from the edge region of the inner space I by circulation of the molten steel M through the tunnel part 200 . It is possible to minimize the formation of a stagnant region of the molten steel (M) even without the molten steel (M).

In the above, preferred embodiments of the present invention have been described and illustrated using specific terms, but such terms are only for clearly describing the present invention, and the embodiments and described terms of the present invention are the spirit of the following claims. And it is obvious that various changes and changes can be made without departing from the scope. Such modified embodiments should not be individually understood from the spirit and scope of the present invention, but should be said to fall within the scope of the claims of the present invention.

Claims

a container in which an inner space for accommodating the melt is formed;

a tunnel portion formed outside the lower portion of the inner space to form a path for sucking and circulating the melt from the inner space; and

A melt stirring device comprising a; gas supply for supplying gas to the tunnel part.
The method according to claim 1,

The tunnel portion is formed in the bottom of the container, and the melt stirring device communicates with the inner space in the central region and the edge region of the bottom.
3. The method according to claim 2,

The tunnel part,

a first hole formed by being recessed from an upper surface of the floor in a central region of the floor;

a second hole formed by being recessed from an upper surface of the floor in an edge region of the floor; and

and a passage formed to communicate the first hole and the second hole with each other in the bottom body.
4. The method according to claim 3,

The second hole is formed in plurality along the edge area of the floor,

The passage is a melt stirring device for communicating the plurality of second holes to the first hole, respectively.
4. The method according to claim 3,

The second hole is a melt stirring device formed in the outermost region of the bottom body connected to the wall of the container.
4. The method according to claim 3,

It further includes; a tap hole formed through the bottom body in order to discharge the molten material;

The tunnel unit, the outlet and the passage for communicating with each other; Melt stirring device further comprising a.
4. The method according to claim 3,

The gas supply unit is a melt stirring device for supplying gas to the first hole.
8. The method of claim 7,

The gas injection port of the gas supply unit is a melt stirring device formed in the inner wall of the first hole.
9. The method of claim 8,

The gas injection hole is formed in plurality, and the plurality of gas injection holes are radially disposed on the inner wall of the first hole.
the process of loading the melt into the inner space of the vessel; and

Including; supplying gas to the melt to stir the melt;

The process of stirring the melt,

A method for stirring a melt, including a process of sucking and circulating the melt through a path formed outside the lower portion of the inner space.
11. The method of claim 10,

The process of sucking and circulating the melt is a melt stirring method in which the melt is sucked and passed into the bottom of the container.
11. The method of claim 10,

The process of sucking and circulating the melt is,

a process of sucking the molten material into the interior of the bottom body in the edge region of the inner space; and

and discharging the sucked melt to a central region of the inner space by moving it inside the bottom.
13. The method of claim 12,

The process of discharging to the central region of the inner space is,

A method for agitating a melt by supplying a gas to the path to release the melt.
11. The method of claim 10,

The process of discharging the molten material charged into the internal space; further comprising,

The process of discharging the melt is,

A melt stirring method for discharging the melt accommodated in the path together with the melt accommodated in the inner space.
11. The method of claim 10,

The melt comprises molten steel,

The vessel is a melt stirring method comprising a ladle in which the molten steel is charged.