JP2000218362A - Well block for preventing slag inclusion, and molten metal container, to which it is attached - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slag inclusion preventive well block used for preventing occurrence of a molten metal vortex, and a molten metal container, to which the block is attached. SOLUTION: This molten metal container is equipped with a slag inclusion preventive well block 1 having a high alumina base part 11 (400 mm long, 400 mm wide, and 200 mm high) and high alumina projection parts 12 for preventing a molten metal vortex (100 mm long, 50 mm wide, and 200 mm high) which are integrated with the base part 11, and a metal discharging nozzle attached by the well block. The projection parts 12 for preventing occurrence of the molten metal vortex are projected at the height of 200 mm from the inner surface of a bottom of the container main body. By restraining a flow of the molten steel, the molten steel vortex occurring near the molten steel gate is prevented in a final stage of casting, so as to prevent contamination of tundish powder, slag and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a well block for disposing a tapping nozzle and a container for a molten metal to which the nozzle is attached. More specifically, the present invention is used for a steelmaking refining furnace, a ladle, a tundish, and the like. TECHNICAL FIELD The present invention relates to a well block for preventing squeezing of a molten metal used to prevent the occurrence of a vortex of molten steel in the vicinity of a taphole at the end of casting, and a container for a molten metal to which the same is attached.

[0002]

2. Description of the Related Art Molten metal is supplied to the bottom of a molten metal container for melting or melting ores, alloys, etc., refining, transporting, storing, etc., for example, a ladle or a refining ladle. Therefore, a tapping nozzle is provided. For example, in a continuous casting method performed by equipment as shown in FIG.
The molten steel discharged from the electric furnace is stored in a ladle and then transferred to a tundish through a tapping nozzle. Then
The steel product is manufactured by being poured into a mold (a bottomless mold) through a tundish tapping nozzle and cooled there. And such a tapping nozzle is disposed at a tapping port of a container for molten metal via a well block.

[0003] In order to prevent the oxidation of molten metal and to insulate the molten metal, in general, tangled or paper sludge is solidified into particles and dried to form a tundish powder on the molten steel upper part of the tundish powder. I have. When the molten steel is poured out of the molten metal container through such a tapping nozzle, at the end of casting when the molten steel in the molten metal container is reduced, as shown in FIG. 12 and FIG. A vortex (in the present specification, this vortex is referred to as “molten steel vortex”) is generated and entrains the above-mentioned tundish powder or noro (hereinafter, “noro etc.”). When such slags and the like become turbid in molten steel, they become impurities and cause deterioration of the quality of the product steel. Therefore, it is necessary to suppress slag and the like as much as possible.

Conventionally, in order to prevent the slag and the like from becoming turbid due to such molten steel vortex, for example, a method in which casting is stopped and the remaining steel is treated when the remaining molten steel becomes a certain amount or less, A method of setting a top nozzle having a chrysanthemum (petal type) inner hole shape therein, or a method of attaching a stopper to a tap hole has been performed. However, in the method described above, it is necessary to determine the outflow of the slag, and a mechanism for detecting the slag such as a coil sensor must be attached to the shroud. Further, in the method (1), there is a problem that it is difficult to control the flow rate due to the sticking of the alumina inclusions or the like to the top nozzle. Furthermore,
The method of (1) is very expensive and has a problem that the steelmaking cost is increased.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above circumstances, and has been developed in a molten metal container used for a steelmaking refining furnace, a ladle, a tundish, and the like. It is an object of the present invention to provide a well block for preventing slag entanglement used to prevent the occurrence of a molten steel vortex generated in the above, and a container for a molten metal to which the well block is attached.

[0006]

Means for Solving the Problems The present inventors have conducted intensive studies to achieve the above-mentioned object, and as a result, have formed a projecting wall (hereinafter referred to as a "projecting portion for preventing vortex generation of molten steel") on a base constituting a conventional well block. To prevent the flow of molten steel in the vicinity of the tap hole, prevent the occurrence of molten steel vortex, avoid turbidity of the molten steel due to entrapment of molten steel into the molten steel, and prevent deterioration of the quality of metal products. The inventors have found that the present invention can be performed, and have completed the present invention. In other words, the well block for preventing slag entanglement of the first invention is a well block for preventing stalk entanglement for disposing a tapping nozzle for tapping molten metal to the outside in a container for molten metal. The base is provided with a projection for preventing vortex generation of molten steel.

[0007] The shape of the "protrusion for preventing molten steel vortex generation" is not particularly limited as long as the flow of molten steel can be suppressed to prevent the generation of vortex molten steel. For example, in addition to the rectangular parallelepiped shape (wall shape) shown in FIG.
It can have a corrugated column shape. Furthermore, as shown in FIG. 6, it can also be made to protrude above the tap hole. In addition, the size of the “projection for preventing molten steel vortex generation” depends on the relationship with the size of the molten metal container to be installed, the size of the nozzle, the amount of hot water or the amount of remaining hot water, and the like. Usually, length is 50-500mm, height is 50-200mm, width is 50-100mm in smelting furnace, 50 in ladle and tundish.
It is about 200 mm, but there is no particular limitation as long as the flow of molten steel in the vicinity of the tap hole can be suppressed to prevent the occurrence of vortex of molten steel. Furthermore, the "protrusion for preventing molten steel vortex generation"
It is desirable to provide a place near the tap hole from the viewpoint of preventing molten steel vortex, but there is no particular limitation as long as it is on the base. For example, as shown in FIG. 7, in addition to the state of extending to the base outer peripheral portion 111 as shown in FIG. 2, it may be arranged in a state of not extending to the base outer peripheral portion 111. The arrangement pattern of the “projections for preventing molten steel vortex generation” is not particularly limited. However, in order to prevent the flow of molten steel as much as possible, a symmetrical shape on the base is required as shown in FIGS. 2 and 8. It is desirable to arrange in. Furthermore,
The number of the "projections for preventing vortex generation of molten steel" provided on the base is also not particularly limited, and is usually four as shown in FIG. 2 but two as shown in FIG. Can also.

The outer shape of the "base" is not particularly limited. For example, as shown in FIG. 2, the outer shape may be a substantially rectangular parallelepiped shape, or may be a cylindrical shape, a rectangular parallelepiped shape, or a polygonal shape as shown in FIG. . The material of the "base" and the "projection for preventing molten steel vortex generation" is not particularly limited as long as it has fire resistance. For example, as a main material, alumina,
Examples thereof include one or a mixture of two or more of silica, magnesia, spinel, zircon, zirconia, chromia, and carbon, and a compound. Of these, bricks and amorphous refractories mainly using alumina as a material are generally used. In addition, as long as the material has fire resistance, the material of the “base” and the “projection for preventing vortex generation of molten steel” may be the same or different. Further, the well block for preventing squeeze entrapment of the first invention is manufactured by integrally forming the "protrusion for preventing vortex generation of molten steel" on the "base" by integral molding, or by separately manufacturing and then using a heat resistant adhesive or the like. It can also be integrated by bonding.

The molten metal container according to the second aspect of the present invention is a container body for storing molten metal and having a tap at the bottom, a well block for preventing squeezing to be attached to the tap, and a well block inside the well block. A tapping nozzle attached to the well block, and the well block is provided with a projection for preventing vortex generation of molten steel at a base thereof, and the projection for preventing vortex generation of molten steel is provided inside the bottom of the container body. It is characterized by protruding from the surface.

[0010] The material of the "container body" is not limited.
Various materials can be used depending on the purpose and application. For example, in the case of a ladle or tundish in a continuous casting apparatus, the material is mainly alumina or magnesia, and in the case of a refining metal furnace, the material is mainly magnesia. The above "departure"
Is provided at the bottom of the container for molten metal, but the location is not particularly limited as long as it is the bottom, and it can be provided at, for example, the center or the corner. Further, the size and shape can be determined according to the relationship with the amount of hot water and the amount of remaining hot water. The "well block" is a well block for preventing squeezing of the first invention, and includes a base and a projection for preventing molten steel vortex generation, and prevents generation of molten steel vortex near the tap hole. The size and material of the well block are not particularly limited as long as they have the effect of preventing molten steel vortex generation, but in order to prevent the generation of molten steel vortex, the projection for preventing molten steel vortex generation is provided at the bottom of the container body. Must protrude from the inner surface of the body. The height of the protrusion from the inner surface is preferably high from the viewpoint of preventing the occurrence of vortex of molten steel, and is usually 50 to 300 mm, preferably 10 to 300 mm.
0 mm or more.

As shown in FIG. 9, the method of fixing the above-mentioned "hot-water nozzle" is generally a well block for preventing slime entrainment, which has a projection for preventing vortex generation of molten steel at the outlet of a molten metal container. 1 is provided, and the well block 1 for preventing squeezing is provided by fixing the top nozzle portion 31 of the tapping nozzle. However, as long as the tapping nozzle is arranged in the container via the well block, there is no limitation on the method of fixing the tapping nozzle. The molten metal container of the second invention can be used for various uses such as a ladle and a tundish used in a continuous casting apparatus, and a metal furnace for refining.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example of the present invention will be specifically described with reference to examples. (1) Swell Entrapment Prevention Well Block As shown in FIG. 2, a snovel entrapment prevention well block 1 of this embodiment has a base 11 and a molten steel vortex generation prevention projection 1.
And 2. The base 11 has a substantially square outer shape and a size of 400 mm long and 400 mm wide.
mm, height 200 mm, and the material is high alumina. The molten steel vortex generation preventing projection 12 is formed so as to be integral with the base 11, has an outer shape of a substantially pentagonal prism, and has dimensions of 100 mm in length, 50 mm in width, and 200 mm in height. The material is high alumina. Four molten steel vortex generation preventing projections 12 are provided so as to be symmetrical around the tap hole 2.

(2) Configuration of Ladle As shown in FIG. 1, the well block 1 is a ladle tapping water installed below the ladle 3 and the tundish 4 used in the continuous casting method according to the present embodiment. Nozzle 31 and a tundish tapping nozzle 41. FIG. 9 is an explanatory view in which the vicinity of the tap hole of the ladle tapping nozzle is enlarged. The ladle tapping nozzle 31 includes a top nozzle 311, a fixed plate 312, a sliding plate 313, and a lower nozzle 314. The top nozzle 311 is attached to a tap hole provided at the lower part of the ladle 3 via the well block 1.
The projection 12 for preventing vortex generation of molten steel provided on the well block 1 protrudes from the inner surface of the bottom of the ladle 3 at a height of 200 mm. 9 and 10, only two protrusions 12 for preventing vortex generation of molten steel are shown for convenience of explanation. The tundish tapping nozzle 41 and the molten steel vortex generation preventing projection provided on the well block for fixing the tundish tapping nozzle 41 also have the same configuration as that described above (not shown).

(3) Method of Use Ladle 3 of molten steel 5 of 70 tons melted in an electric furnace.
To be stored. Thereafter, the steel is tapped into the tundish 4 at a speed of 1.1 ton / min through a ladle tapping nozzle 31 installed at the lower part of the ladle. Thereafter, a tundish powder is sprayed on the surface of the molten steel 5 in the tundish to prevent oxidation of the molten steel and to insulate the molten steel, and then, through a tundish tapping nozzle 41 provided at two lower portions of the tundish, 0.55 ton each. The steel is tapped into the mold 7 at a speed of / min (only one tundish tapping nozzle 41 is shown). The molten steel 5 is cooled and cast by the mold 7.

(4) Effect of the embodiment As described above, FIGS. 12 and 13 show that the amount of molten steel in the ladle and the tundish is reduced in the process of continuing the tapping from the ladle and the tundish by the continuous casting method. As described above, the molten steel vortex is generated in the molten steel, and the floating Noro 6 and tundish powder are involved, and the molten steel is discharged into the mold together with the molten steel. However, in the present embodiment in which the molten steel vortex generation preventing projections 12 are provided, the flow of the molten steel can be restricted as shown in FIGS. 10 and 11, thereby preventing the occurrence of the molten steel vortex. It is possible to prevent turbidity of slag 6 and tundish powder on the upper part of molten steel.

The present invention is not limited to the specific embodiments described above, but may be variously modified within the scope of the present invention according to the purpose and application. For example, there is no particular limitation on the type of molten metal stored in a molten metal container in which the well block for preventing slag entrapment of the present invention is disposed, and not only molten steel as in a continuous casting method, but also various molten metals. Can be used. Also,
As a reference example, the projection 12 for preventing vortex generation of molten steel according to the present invention.
As shown in FIGS. 14 to 16, can be provided not on the well block but on the bottom inner surface of the tapping nozzle or the molten metal container. In FIGS. 14 and 16, only two molten steel vortex generation preventing projections 12 are shown for convenience of explanation. As described above, the protrusion 12 for preventing molten steel vortex generation used in this reference example may be of various sizes, shapes, and materials within the scope of the present invention depending on the purpose and application. it can. Furthermore, as long as the molten steel vortex generation preventing projection 12 of the present invention protrudes from the inner surface of the bottom of the molten metal container, the upper flat surface of the well block base is, as shown in FIG. In addition to the same position as the inner surface, it may be located below the inner surface of the bottom of the molten metal container as shown in FIG. Further, the shape of the tap hole 2 may be a straight shape as shown in FIG. 10 or an inclined shape as shown in FIG. In addition, the shape of the inner surface of the molten steel vortex generation preventing projection 12 on the tap hole side is different from the shape of the tap hole,
The shape corresponding to the shape of the tap hole can also be adopted. For example, when the tap hole is circular, FIGS.
And a curved surface (that is, a curved surface) as shown in FIGS. 7 and 8 as an example of the latter. Can be.

[0017]

According to the well block for preventing entanglement of the slag in the first aspect of the present invention, the flow of molten steel is suppressed by the projection for preventing the occurrence of molten steel vortex formed on the base, so that the molten steel vortex near the taphole is suppressed. Can be prevented from occurring. Further, according to the molten metal container of the second invention, since the tapping nozzle is provided through the noro entanglement prevention well block provided with the molten steel vortex generation prevention projection of the first invention, Since it is possible to prevent the occurrence of vortex of molten steel in the vicinity of the tap hole, it is possible to easily and inexpensively prevent turbidity of molten steel such as slag and transfer the molten steel to the container of the next process as compared with the conventional method. As a result, a high-quality metal product free of impurities can be manufactured. And this molten metal container can be applied to a wide range of uses such as a ladle, a tundish or a refining furnace in a continuous casting method.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a continuous casting apparatus.

FIG. 2 is a perspective view showing a well block for preventing sneaking in according to the embodiment.

FIG. 3 is a top view of the well block shown in FIG. 2;

FIG. 4 is a side view of the well block shown in FIG. 2;

FIG. 5 is a sectional view taken along line AA ′ of the well block shown in FIG. 2;

FIG. 6 is a perspective view showing a modified example of a well block for preventing sneaking in according to the present invention.

FIG. 7 is a perspective view showing a modified example of a well block for preventing sneaking in according to the present invention.

FIG. 8 is a perspective view showing a modified example of the well block for preventing sneaking in according to the present invention.

FIG. 9 is an explanatory diagram in which a cross section around a tap hole of a ladle tapping nozzle using a well block for preventing entanglement according to an embodiment is enlarged.

FIG. 10 is a cross-sectional explanatory view showing a ladle tapping nozzle using a well block for preventing slime entanglement according to the embodiment and the movement of molten steel.

FIG. 11 is an enlarged schematic top view showing a ladle tapping nozzle using a well block for preventing slag entanglement according to the present invention and the movement of molten steel.

FIG. 12 is an explanatory sectional view showing the movement of molten steel and a tapping nozzle using a conventional well block.

FIG. 13 is an enlarged schematic top view showing the movement of molten steel and a tapping nozzle using a conventional well block.

FIG. 14 is an enlarged explanatory view of a cross section around a tap hole of a tapping nozzle provided with a projection for preventing molten steel vortex generation on the tapping nozzle.

FIG. 15 is a top view of the tapping nozzle shown in FIG.

FIG. 16 is an enlarged explanatory view of a section around a tap hole of a tapping nozzle provided with a projection for preventing vortex generation of molten steel on a bottom inner wall surface of a container for molten metal.

[Explanation of symbols]

1; well block for preventing squeezing, 11; base,
111: base outer periphery, 12: projection for preventing vortex generation of molten steel,
2; tap hole, 3; ladle, 31; ladle tap nozzle, 31
1; Top nozzle, 312; Fixed plate, 313; Sliding plate, 314; Lower nozzle, 4; Tundish, 41; Tundish tapping nozzle, 5; Molten steel, 6; Noro, 7;

Continued on the front page (72) Inventor Hirokatsu Hattanda 3-1-1, Ohata-cho, Tajimi-shi, Gifu Tokyo Inside the Tajimi Plant of Ceramics Co., Ltd. (72) Tomomi Soeda 3-1-1, Ohata-cho, Tajimi-shi, Gifu Tokyo Tajimi Ceramics Co., Ltd. Inside the factory (72) Inventor Takeshi Yoshida 3-1-1, Ohatacho, Tajimi-shi, Gifu Prefecture Tokyo Ceramics Co., Ltd. Tajimi Factory

Claims (2)

[Claims] 1. A well block for preventing snarl entrapment for disposing a tapping nozzle for tapping molten metal to the outside in a container for molten metal, wherein a protrusion for preventing vortex generation of molten steel is provided at a base of the well block. A well block for preventing squeezing. 2. A container main body containing a molten metal and having a tap at the bottom thereof, a well block for preventing snarl entanglement mounted in the tap, and a nozzle for tapping mounted in the well block. Equipped, the well block,
A molten metal container, wherein a molten steel vortex generation preventing projection is provided on a base portion, and the molten steel vortex generation preventing projection projects from an inner surface of the bottom of the container body.