KR20150071387A - Refining Apparatus of Molten Steel - Google Patents

Refining Apparatus of Molten Steel Download PDF

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Publication number
KR20150071387A
KR20150071387A KR1020130158366A KR20130158366A KR20150071387A KR 20150071387 A KR20150071387 A KR 20150071387A KR 1020130158366 A KR1020130158366 A KR 1020130158366A KR 20130158366 A KR20130158366 A KR 20130158366A KR 20150071387 A KR20150071387 A KR 20150071387A
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KR
South Korea
Prior art keywords
molten steel
gas supply
gas
cover body
ladle
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Application number
KR1020130158366A
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Korean (ko)
Inventor
이승훈
Original Assignee
주식회사 포스코
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Priority to KR1020130158366A priority Critical patent/KR20150071387A/en
Publication of KR20150071387A publication Critical patent/KR20150071387A/en

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

A molten steel treatment apparatus according to the present invention is an apparatus for treating molten steel, comprising: a container having an inner space in which the molten steel is stored and having an opening formed thereon; and a cover portion covering the opening portion of the container, A cover body which is formed along the cross-sectional shape of the opening and which is mounted to the opening portion; a plurality of injection nozzles which are provided on the cover body and which are arranged toward the inside of the container; And a gas supply unit for supplying a gas to the injection nozzle of the combustion chamber, so that oxidation of the molten steel can be suppressed or prevented.

Description

[0001] DESCRIPTION [0002] Refining Apparatus of Molten Steel [

The present invention relates to a molten steel treatment apparatus, and more particularly to a molten steel treatment apparatus capable of suppressing or preventing the oxidation of molten steel.

A ladle, which is a refining facility used in a steelmaking process, receives molten metal from the molten metal in a converter, removes nonmetallic inclusions contained therein, and regulates the temperature of the molten metal. The melt may then have a quality suitable for use in subsequent continuous casting processes.

Generally, for this purpose, the top lance is lowered into the ladle where the molten steel is stored, or the inert gas is blown into the molten steel through the low-noise nozzle provided on the bottom surface of the ladle. However, in this process, the bubbles generated by the gas move to the upper part of the molten steel, and the molten steel can move to the upper part together. Accordingly, molten steel can be oxidized by penetrating the upper slag layer and coming into contact with the air. In addition, molten steel may react with nitrogen in the air to increase the nitrogen concentration. Oxidized molten steel can form inclusions in the continuous casting process, blocking the immersion nozzle and reducing the quality of the produced cast steel. In addition, nitrogen in the molten steel increases brittleness of the surface of the cast steel, and cracks are generated in the cast steel.

Therefore, conventionally, as shown in Japanese Patent Laid-Open No. 1996-060225, when a gas is blown into molten steel using a top lance, a cover is attached to the ladle to block the inside of the ladle from the outside. However, since the cover is mounted in a state in which air has already been introduced into the cover, air in the cover can react with the molten steel. Therefore, in order to prevent the molten steel from being oxidized, there is a need for a technique capable of suppressing inflow of outside air while discharging the introduced air.

Japanese Patent Application Laid-Open No. 1996-060225

The present invention provides a molten steel treatment apparatus capable of suppressing or preventing the oxidation of molten steel.

The present invention provides a molten steel treatment apparatus capable of improving the quality of a produced cast steel.

A molten steel treatment apparatus according to an embodiment of the present invention includes a vessel having an inner space in which the molten steel is stored and having an opening at an upper portion thereof and a cover portion covering an opening portion of the vessel,

Wherein the cover portion includes a cover body which is formed along the cross-sectional shape of the opening portion and is mounted on the opening portion, a plurality of injection nozzles which are provided on the cover body and are disposed inside the container, And a gas supply unit connected to supply the gas to the plurality of injection nozzles.

A molten steel treatment apparatus according to another embodiment of the present invention includes a vessel having an inner space in which the molten steel is stored and having an opening formed thereon and a cover portion covering the opening of the vessel,

Wherein the cover portion includes a cover body formed along the sectional shape of the opening portion and mounted on the opening portion, an injector disposed inside the cover body and having a plurality of injection holes formed toward the inside of the container, A gas supply pipe connected to the injector and supporting the injector, and a gas supply unit connected to the gas supply pipe and supplying gas to the gas supply pipe.

The cover body is provided with a through hole extending vertically so that a processor capable of being immersed in the molten steel can be inserted and removed.

And a second through hole corresponding to the first through hole and capable of entering and exiting the processor is provided in the sprayer. The first through hole is formed in the cover body so as to be vertically extended and capable of being immersed in the molten steel. do.

The sprayer includes a top plate connected to the gas supply pipe, a bottom plate spaced apart from the top plate and disposed at a lower side and having the plurality of injection holes, and side walls connecting the top plate and the bottom plate.

The plurality of injection holes are arranged radially.

The gas supply unit includes a gas storage unit in which a gas is stored, a gas supply line having one end connected to the gas storage unit and the other end connected to the injection nozzle or the gas supply line, and a gas supply line connected between the gas storage unit and the gas supply line And a control valve for controlling the supply amount of the gas.

The vessel includes a ladle and the processor includes a top lance.

A molten steel treatment apparatus according to embodiments of the present invention includes a cover and a spray nozzle or an injector installed in the cover.

The cover can block external air from entering the ladle. Further, the injection nozzle or the injector injects an inert gas into the container, so that the air in the container is pushed by the inert gas and can be discharged outside the ladle. Accordingly, it is possible to minimize the contact of the molten steel with the air even when the molten steel passes through the slag layer and moves upward due to the bubbles generated during the process of processing the molten steel by filling the inside of the ladle with the inert gas.

When the molten steel is inhibited or prevented from being oxidized by contact with air, it is possible to prevent oxygen or nitrogen from reacting with the molten steel. Therefore, inclusions are generated in the molten steel, cracks are prevented from being generated in the cast steel, and the quality of the produced cast steel can be improved.

1 is a schematic view showing a steelmaking operation according to an embodiment of the present invention;
2 is a schematic view showing a molten steel processing apparatus according to an embodiment of the present invention;
FIG. 3A is a plan view showing a cover according to an embodiment of the present invention; FIG.
FIG. 3B is a perspective view illustrating a cover according to an embodiment of the present invention; FIG.
4 is a schematic view showing a molten steel processing apparatus according to another embodiment of the present invention.
5 is a bottom view of a cover according to another embodiment of the present invention;

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It will be apparent to those skilled in the art that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know. To illustrate the invention in detail, the drawings may be exaggerated and the same reference numbers refer to the same elements in the figures.

Although embodiments of the present invention are illustratively described with respect to the ladle used in the steel production process, the scope of application is not so limited and may be used in various containers capable of storing molten steel.

According to an embodiment of the present invention, there is provided an apparatus for treating molten steel, comprising: a vessel having an opening formed on an upper side thereof; and a cover portion having a plurality of injection nozzles and covering an opening portion of the vessel. At this time, the container may be a ladle.

1 is a schematic view showing a steelmaking operation according to an embodiment of the present invention.

First, in order to understand the present invention, the steelmaking operation will be briefly described as an example. Steelmaking operations may include pre-ironing, turning operations, and secondary refining operations. The preliminary treatment of molten iron is a process of removing impurities such as sulfur, phosphorus and the like contained in the molten iron discharged from the blast furnace. Referring to FIG. 1, in the conversion operation, charcoal and scrap are charged into the converter 100. Then, the raw materials such as quick lime and coolant are injected into the cargo lance and decarbonized and talled to refine the charred cargo.

The refined molten steel 10 can tap the ladle 200 from the converter 100. In the secondary refining process, when the top lance 300 is inserted into the molten steel 10 in the ladle 200 and the gas is introduced into the ladle 200, bubbles are generated and the stirring force can be supplied to the molten steel 10 while floating. As a result, the refining operation can proceed as the components and the temperature of the molten steel 10 and the slag 20 become uniform. However, the molten steel 10 can be oxidized in contact with the air while floating through the slag 20 layer by the air bubbles. Therefore, the molten steel treatment apparatus according to the embodiments of the present invention can be used to suppress or prevent oxidation of the molten steel 10.

FIG. 2 is a schematic view showing a molten steel treatment apparatus according to an embodiment of the present invention, FIG. 3A is a plan view showing a cover part 500 according to an embodiment of the present invention, FIG. Fig.

Hereinafter, a molten steel treating apparatus according to an embodiment of the present invention will be described. Referring to FIG. 2, the apparatus for treating molten steel according to an embodiment of the present invention includes a ladle 200 having an inner space in which the molten steel 10 is stored, And a cover portion 500 covering the opening portion.

The ladle 200 is formed in a container shape and has an inner space in which the molten steel 10 can be stored. The interior of the ladle 200 may be constructed of a refractory 210 to prevent the ladle 200 from being deformed or broken due to the hot molten steel 10. The upper portion of the ladle 200 is opened to form an opening through which the molten steel 10 can be fed into the ladle 200. The bottom surface of the ladle 200 may be provided with a low-noise nozzle 400 for blowing gas into the molten steel 10 in the ladle 200. Thus, the inert gas 400, for example, nitrogen or argon gas, can be introduced into the molten steel 10 stored in the ladle 200. These gases can stir the molten steel 10 while floating and expanding in the molten steel 10. However, the shape and structure of the ladle 200 are not limited thereto and may vary.

The cover unit 500 according to an embodiment of the present invention includes a cover body 510 formed along the sectional shape of the opening and mounted to the opening portion, And a gas supply unit 530 connected to the plurality of injection nozzles 520 and supplying a gas to the plurality of injection nozzles 520. The plurality of injection nozzles 520 may be a plurality of nozzles.

3A or 3B, the cover body 510 may be formed along a circular shape along the cross-sectional shape of the opening of the ladle 200, for example, and may be wider from the upper part to the lower part. The diameter of the lower portion of the cover body 510 may be equal to or greater than the diameter of the opening. Accordingly, the cover body 510 can be mounted on or covered on the ladle 200. [ The cover body 510 may be provided with a through hole 550 formed in the vertical direction so as to allow the processor capable of immersing in the molten steel 10 into and out of the cover body 510. The through-hole 550 may be formed to be equal to or larger than the cross-sectional area of the processor immersed in the molten steel 10 so that the processor can enter and exit.

For example, the processor may include a top lance 300 that draws gas into the molten steel. A through hole 550 having a larger diameter than the outer diameter of the top lance 300 may be provided at the center of the cover body 510. The top lance 300 can move up and down through the through hole 550 or perform refining or processing operations on the molten steel 10 inside the cover body 510 through the through hole 550 . However, the structure and the shape of the cover body 510 are not limited to this and may vary. Also, the size and the position and the number of the through holes 550 provided in the cover body 510 are not limited to these, and may vary.

A plurality of injection nozzles 520 are provided on the cover body 510. The injection nozzle 520 may be disposed such that the portion injecting the inert gas is directed toward the inside of the ladle 200. For example, in an embodiment of the present invention, four injection nozzles 520 may be provided, and in order to uniformly inject the inert gas into the ladle 200, the edge portions of the cover body 510 and the through holes 550 along the circumference of the cover body 510. Thus, if the injection nozzle 520 uniformly injects the inert gas into the ladle 200, the inside of the ladle 200 can be formed into an inert gas atmosphere.

The inert gas filled in the ladle 200 discharges the air to the outside of the cover body 510 through the through hole 550 and allows the outside air to flow inside the cover body 510 through the through hole 550 Can be blocked. Therefore, even if the bubbles generated by the low-loss nozzle 400 or the top lance 300 penetrate the slag 20 layer and float the molten steel 10, the molten steel 10 can not reach the atmosphere in the inert gas atmosphere inside the cover body 510 It is possible to suppress or prevent the molten steel 10 from being oxidized. However, the position and the number of the injection nozzles 520 are not limited to this, and may vary.

The gas supply unit 530 includes a gas storage unit 531 storing an inert gas, a gas supply line 532 having one end connected to the gas storage unit 531 and the other end connected to the injection nozzle 520, And a control valve 533 provided between the gas storage unit 531 and the gas supply line 532 and controlling the supply amount of the gas. Accordingly, when the control valve 533 is opened before the refining operation of the molten steel 10 in the ladle 200 is started, the inert gas stored in the gas storage unit 531 is supplied to the injection nozzle 520 ). Then, the injection nozzle 520 injects an inert gas into the ladle 200 to form an inert gas atmosphere inside the ladle 200. Thus, it is possible to prevent the molten steel 10 from being oxidized by contact with air during the refining operation.

When the refining operation is completed, the control valve 533 can be locked. Then, the gas storage unit 531 stops supplying the inert gas to the injection nozzle 520, so that the injection of the inert gas into the ladle 200 can be stopped. However, the structure and structure of the gas supply unit 530 are not limited thereto, and the inert gas may be supplied to the injection nozzle 520 by various methods. Further, the timing and time at which the inert gas is supplied or injected may be varied without being limited thereto.

FIG. 4 is a schematic view showing a molten steel treatment apparatus according to another embodiment of the present invention, and FIG. 5 is a bottom view showing a cover part 600 according to another embodiment of the present invention.

Hereinafter, a molten steel treating apparatus according to another embodiment of the present invention will be described. Referring to FIG. 4A, a molten steel treatment apparatus according to another embodiment of the present invention includes a ladle 200 having an inner space in which molten steel is stored and having an opening at an upper portion thereof, And a cover portion 600.

The structure and shape of the ladle 200 may be the same as the ladle 200 described in the embodiment. Therefore, the detailed description of the ladle 200 will be duplicated, and a description thereof will be omitted.

The cover part 600 according to another embodiment of the present invention includes a cover body 610 formed along the sectional shape of the opening part and mounted to the opening part and a cover body 610 disposed inside the cover body 610, The injector 620 is formed along the cross section of the cover body 200 and has a plurality of injection holes 621 formed toward the inside of the ladle 200. The injector 620 passes through the cover body 610, And a gas supply unit 630 connected to the gas supply line 640 and supplying the gas to the gas supply line 640. The gas supply line 640 is connected to the gas supply line 640, .

The cover body 610 may be formed along the cross-sectional shape of the opening of the ladle 200 and mounted or covered on the ladle 200. The cover body 610 may be provided with a first through hole 650 extending vertically so that a processor capable of immersing the molten steel 10 in and out can be provided. Accordingly, the processor can perform the refining or processing operation on the molten steel 10 inside the cover body 610 through the first through-hole 650 or through the first through-hole 650 have. The cover body 610 may be provided with a through-hole through which the gas supply pipe 640, which will be described later, passes. These through-holes may be provided as many as the number of the gas supply pipes 640 to fix the gas supply pipe 640 so that the gas supply pipe 640 can not move. Accordingly, the injector 620, which will be described later, may be connected to the gas supply pipe 640 and be supported by the gas supply pipe 640. However, the structure and the shape of the cover body 610 are not limited to this and may vary.

The gas supply pipe 640 may extend in the longitudinal direction to form a path through which the gas can move. At least one gas supply pipe 640 may be provided, and the gas supply pipe 640 may be installed through the cover body 610 in a vertical direction. That is, one end of the gas supply pipe 640 may be exposed to the outside of the cover body 610, and the other end may be disposed to face the lower side of the cover body 610. At this time, the gas supply pipe 640 may be fixedly supported on the cover body 610. Accordingly, the gas supply pipe 640 may be connected to the injector 620, which will be described later, connected at the lower end thereof to support the injector 620. In addition, the inside of the gas supply pipe 640 can communicate with the inside of the injector 620 and move the gas into the injector 620.

For example, in the present embodiment, four gas supply pipes 640 may be provided to support the injector 620. When the number of the gas supply pipes 640 is increased, the injector 620 can be stably supported. However, if too much is provided, the number of the through-holes must be increased, so that it may be difficult to manufacture the cover body 610. Further, since the gas supply line 632 to be described later must be connected to each gas supply line 640, the structure of the gas supply line 632 can be complicated. However, the shape, the number of the gas supply pipe 640, and the method of installing the gas supply pipe 640 are not limited to these, and may vary.

4 or 5, the injector 620 is disposed inside the cover body 610 by a gas supply pipe 640, and may be formed along the cross-sectional shape of the ladle 200. For example, the injector 620 according to an embodiment of the present invention includes an upper plate 623 connected to the gas supply pipe 640, and a plurality of injection holes 621 disposed on the lower side, And a side wall 625 for connecting the upper plate 623 and the lower plate 624. [ Accordingly, the injector 620 may have an internal space into which an inert gas can flow. The upper plate 623 may be formed in a circular plate shape and connected to the gas supply pipe 640. Accordingly, the inert gas can be introduced into the injector 620 through the gas supply pipe 640 and the top plate 623. [ However, the structure and shape of the upper plate 623 are not limited to the above, and may vary.

The lower plate 624 can be formed in the same shape as the upper plate 623 and is disposed apart from the lower side of the upper plate 623. The lower plate 624 may be formed with a plurality of injection holes 621 through which an inert gas may be injected. The injection holes 621 may be arranged radially from the center of the lower plate 624 to the outside. Accordingly, the inert gas introduced into the injector 620 through the upper plate can be uniformly injected downward through the injection hole 621 radially provided in the lower plate 624. [

When the inert gas is uniformly injected into the ladle 200, the inert gas in the ladle 200 can be evenly distributed, so that the interior of the ladle 200 can be effectively formed into an inert gas atmosphere. Then, the inert gas filled in the ladle 200 discharges air to the outside of the cover body 610 through the first through-hole 650, while the outside air flows through the first through-hole 650 into the cover body 610 from the outside. Even if the bubbles generated by the low-loss nozzle 400 or the top lance 300 penetrate the slag layer 20 and the molten steel 10 is lifted upward, the molten steel 10 can be prevented from flowing into the inert gas atmosphere inside the cover body 610 Since it comes into contact with the atmosphere, it can be prevented from being oxidized. However, the shape and structure of the lower plate 624 are not limited to this and may be various. The shape of the injection hole 622 is not limited to this, and may be various.

The side wall 625 may connect the upper plate 623 and the lower plate 624 and may be provided while surrounding the periphery of the upper plate 623 and the lower plate 624. Thus, the side wall 625 can be connected to the upper plate 623 to support the lower plate. The side wall 625 can prevent the inert gas introduced between the upper plate 623 and the lower plate 624 from flowing out to the side between the upper plate 623 and the lower plate 624. However, the structure and position of the sidewall 625 are not limited to this and may vary.

The injector 620 may be provided with a second through hole 622 through which the processor capable of immersing in the molten steel 10 in and out can be inserted or removed in correspondence with the first through hole 650. Thus, the processor that has passed through the first through-hole 650 can also pass through the second through-hole 622 to perform refining or processing operations on the molten steel 10 within the ladle 200. However, the structure and shape of the injector 200 are not limited to this and may vary.

The gas supply unit 630 includes a gas storage unit 631 storing a gas, a gas supply line 632 having one end connected to the gas storage unit 631 and the other end connected to the gas supply line 640, And a control valve 633 provided between the gas storage unit 631 and the gas supply line 632 for controlling the supply amount of the gas. The inert gas stored in the gas storage unit 631 is supplied to the gas supply line 632 and the gas supply line 640 To the injector 620. The injector 620, as shown in FIG. Then, the injector 620 injects an inert gas into the ladle 200 so that the inside of the ladle 200 can be formed into an inert gas atmosphere. Thus, it is possible to prevent the molten steel 10 from being oxidized by contact with air during the refining operation.

When the refining operation is completed, the control valve 633 can be locked. Then, the gas storage unit 631 stops supplying the inert gas to the injector 620, so that the injection of the inert gas into the ladle 200 can be stopped. However, the configuration and structure of the gas supply unit 630 are not limited thereto, and the inert gas may be supplied to the gas supply pipe 640 and the injector 620 by various methods. Further, the timing and time at which the inert gas is supplied or injected may be varied without being limited thereto.

Although the cover portion mounted on the ladle has been described above by way of example, the scope of application is not limited thereto and can be used in various containers capable of storing molten steel.

Although the present invention has been described in detail with reference to the specific embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be defined by the appended claims, as well as the appended claims.

100: converter 200: ladle
300: Top lance 400: Deodorizing nozzle
500: cover part

Claims (8)

An apparatus for treating molten steel,
A container having an inner space in which the molten steel is stored and having an opening formed thereon;
And a cover portion covering the opening portion of the container,
Wherein the cover portion includes a cover body formed along the cross-sectional shape of the opening portion and mounted to the opening portion,
A plurality of injection nozzles provided in the cover body and disposed toward the inside of the container,
And a gas supply unit connected to the plurality of injection nozzles and supplying a gas to the plurality of injection nozzles. An apparatus for treating molten steel,
A container having an inner space in which the molten steel is stored and having an opening formed thereon;
And a cover portion covering the opening portion of the container,
Wherein the cover portion includes a cover body formed along the cross-sectional shape of the opening portion and mounted to the opening portion,
An injector disposed inside the cover body and having a plurality of injection holes formed toward the inside of the container,
A gas supply pipe connected to the injector through the cover body and supporting the injector,
And a gas supply unit connected to the gas supply pipe and supplying gas to the gas supply pipe. The method according to claim 1,
Wherein the cover body is provided with a through-hole extending vertically so that a processor capable of being immersed in the molten steel can be inserted and removed. The method of claim 2,
And a second through hole corresponding to the first through hole and capable of entering and exiting the processor is provided in the sprayer. The first through hole is formed in the cover body so as to be vertically extended and capable of being immersed in the molten steel. The molten steel treatment apparatus comprising: The method of claim 2,
Wherein the injector includes a top plate connected to the gas supply pipe, a bottom plate spaced apart from the top plate and disposed at a lower side and having the plurality of injection holes, and side walls connecting the top plate and the bottom plate. The method of claim 5,
And the plurality of injection holes are radially arranged. The method according to claim 1 or 2,
The gas supply unit includes a gas storage unit in which a gas is stored, a gas supply line having one end connected to the gas storage unit and the other end connected to the injection nozzle or the gas supply line, and a gas supply line connected between the gas storage unit and the gas supply line And a control valve for controlling the supply amount of the gas. The method according to any one of claims 1 to 6,
Wherein the vessel includes a ladle, and the processor includes a top lance.
KR1020130158366A 2013-12-18 2013-12-18 Refining Apparatus of Molten Steel KR20150071387A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101701981B1 (en) * 2015-09-16 2017-02-02 주식회사 포스코 Apparatus and method for keeping temperature
KR20220043658A (en) * 2020-09-29 2022-04-05 주식회사 포스코 Transporting apparatus and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101701981B1 (en) * 2015-09-16 2017-02-02 주식회사 포스코 Apparatus and method for keeping temperature
KR20220043658A (en) * 2020-09-29 2022-04-05 주식회사 포스코 Transporting apparatus and method

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