KR200267443Y1 - Reduction structure of slag mixing in molten steel in steelmaking process - Google Patents

Abstract

The present invention relates to a slag mixing reduction structure in the steelmaking process in which the molten steel can be discharged by installing a slag mixing reducing element on the discharge side of the molten steel to prevent the slag from being mixed during the steelmaking process.

In the structure of discharging molten steel through the lower nozzle of the container in the steelmaking process, the plate-shaped slag blocking plate 10 concave downward through a plurality of connecting rods 20 directly above the nozzle 130 through which the molten steel is discharged. ) Is maintained at a proper distance away.

Description

Slag mixing reduction structure in molten steel in steelmaking process

The present invention relates to a structure that prevents slag from being mixed during molten steel discharge during the steelmaking process. More specifically, in the molten steel in the steelmaking process in which only the molten steel can be discharged by installing a slag mixing reducing body on the outlet side of the molten steel. Slag mixing reduction structure.

In general, molten steel moves from ladle to tundish nozzle or from tundish to performance mold during the steelmaking process of the steel mill, and when molten steel moves through the nozzle part of the equipment, the discharge port is normally discharged at or before the end of discharge. Rapid vortex flow occurs on the side, and the slag located in the upper part of the molten steel is rapidly mixed in the molten steel by the vortex, thereby degrading the quality of the steel and thus causing a defective product to be produced. In addition, when the molten steel discharge is terminated before the vortex occurs on the molten steel outlet side to block the mixing of slag, the amount of molten steel that has not been discharged increases, resulting in a decrease in the production volume. To increase the time and cost for the treatment.

In other words, it is very important to discharge as much molten steel as possible without incorporation of slag in order to improve the quality of the steel, to reduce the amount of large currents and to increase the production.

Conventionally, in order to reduce such slag mixing, a method of installing a separate vortex prevention jaw at a portion close to a nozzle portion from which molten steel is discharged and a method of using a spherical large slag ball are disclosed. The container 120 is composed of a container 120 capable of holding the molten steel 110 and a nozzle 130 installed vertically to discharge the molten steel 110 at the center of the lower wall of the container 120. The molten steel 110 accommodated therein may be discharged to the lower side through the nozzle 130.

In the slag mixing reduction method by installing the vortex prevention jaw, as shown in FIG. 1, the vortex in which one side is close to the nozzle 130 and the other side is fixed to the side wall of the container 120 at an appropriate portion of the lower wall of the container 120. By installing the prevention jaw 140 and setting the height of the vortex prevention jaw 140 to an appropriate level, the flow of the vortex generated at the edge of the upper portion of the nozzle 130 before or at the end of the discharge of the molten steel 110 is completed. The vortex blocking jaw 140 is blocked, thereby preventing the slag 112 of the molten steel 110 is mixed into the nozzle 130 side, the method using a large spherical slag ball, shown in FIG. As described above, the specific gravity of the slag 112 is slightly similar to or slightly smaller than that of the molten steel 110, so that the large spherical slag ball 150 is floated on the upper side of the molten steel, which is formed when the vortex of the molten steel is formed. Upper part of Located on a technique for preventing the slag (112) to be incorporated into nozzle 130.

However, the slag incorporation reduction method according to the conventional method has an effect of preventing the slag incorporation to some extent at the beginning of the inflow of slag, while the molten steel flow at the end of the molten steel discharge where the incorporation of slag proceeds rapidly. There was a problem that can not reduce the amount of residual molten steel to interfere.

In addition, a method of blocking slag by supplying a high-pressure gas by installing a pipe for injecting gas at a position where vortices occur in a method different from the above is also used, but such a method also obstructs the flow of molten steel at the end of discharge. This did not solve the problem of a certain amount of residual molten steel.

The present invention is to solve such a conventional problem, the slag mixing reduction structure in the steelmaking process to prevent the slag is mixed in the discharged molten steel without disturbing the flow of molten steel when the discharge of molten steel is made The purpose is to provide.

1 is a block diagram showing a method for reducing slag incorporation using a vortex barrier according to the related art.

Figure 2 is a block diagram showing a method for reducing the slag mixing by using a slag ball according to the prior art

3 is a schematic configuration diagram showing a slag mixing reduction structure in molten steel in a steelmaking process according to the present invention;

Figure 4 is an external perspective view showing a slag mixing reducer according to the present invention.

Explanation of symbols on the main parts of the drawings

10 ... slag blocking plate

20 ... connecting rod

110 ... molten steel

112 ... slag

130 ... Nozzle

The present invention as a technical configuration for achieving the above object, in the structure of discharging molten steel through the nozzle on the lower side of the container in the steelmaking process, a plurality of connecting rods through the connecting portion directly above the nozzle, the molten steel is discharged, To prevent vortex formation of the molten steel flow without being discharged directly through the nozzle, the downwardly concave dish-shaped slag blocking plate is kept at a position away from the nozzle so that the molten steel flow space is set so that the molten steel flow is not disturbed. By providing a slag mixing reduction structure in the molten steel in the steelmaking process characterized in that the.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a schematic block diagram showing a structure of reducing slag mixing by mounting the slag mixing reducing body 1 according to the present invention directly on the nozzle 130, and a slag blocking plate 10 made of a plate shape; The slag blocking plate 10 has a structure consisting of a plurality of connecting rods 20 connected to the lower surface of the vessel 120 and the lower wall.

That is, the slag blocking plate 10 is formed in the shape of a roughly concave plate to the bottom so as to be located at an appropriate distance away from the upper side of the nozzle 130, wherein the slag blocking plate 10 and the lower portion of the container 120 Since the molten steel 120 is discharged to the nozzle 130 side through the space formed between the wall, such molten steel flow area should have an area that does not interfere with the flow of the molten steel, for this purpose the slag blocking The plate 10 should be located above the proper distance from the nozzle 130.

In addition, the plurality of connecting tables 20 provided at the lower portion of the slag blocking plate 10 is a member supporting the slag blocking plate 10 so that the slag blocking plate 10 can be maintained at the above position, and as small as possible so as not to block the flow of molten steel. It is good to have a diameter.

Of course, the connecting table 20 is installed in the vertical direction in the drawings, but is not limited to such a mounting structure, the slag blocking plate 10 may be a structure that can be fixed to the container 120.

As the material of the slag blocking plate 10 and the connecting table 20, non-oxide-based high-temperature structural ceramics such as MgO-C-based refractory, silicon carbide, and silicon nitride, which are excellent in chemical resistance and thermal shock resistance in molten steel, are used. desirable.

According to the above structure, when the molten steel is discharged from the steelmaking equipment of the ladle and tundish, the plate-shaped slag blocking plate 10 is provided directly on the nozzle 130, so that the discharge flow of the molten steel is the slag blocking plate 10. It is changed to flow toward the nozzle 130 through the lower side of the), which is to prevent the molten steel is not discharged directly through the nozzle 130 to the lower side to prevent the molten steel flow formed into the vortex, and also slag blocking plate (10) ) The molten steel flow space formed in the lower part is set properly so that it does not disturb the flow of molten steel.

In addition, when the slag 112 of the upper portion of the molten steel 110 reaches the upper surface of the slag blocking plate 10 after a predetermined time elapses, the slag 112 is blocked from moving further to the lower side, which is slag 112. ) Is prevented from being discharged to the nozzle 130 side, the slag 112 layer is not discharged to the nozzle 130 even when the discharge completion point of the molten steel is reached.

As described above, according to the slag mixing reduction structure in the molten steel in the steelmaking process according to the present invention, the plate-shaped slag blocking plate is positioned at the proper position immediately above the nozzle from which the molten steel is discharged, thereby inducing the flow of molten steel to the lower side thereof to form a vortex. And effectively prevents slag from entering the nozzle side, thus improving the productivity and product quality of the molten steel.

Claims (1)

In the structure of discharging molten steel through the nozzle on the lower side of the container in the steelmaking process, A plurality of connecting rods 20 are directly connected to the nozzle 130 through which the molten steel is discharged, and the dish is recessed downward to prevent vortex formation of the molten steel flow without being directly discharged downward through the nozzle 130. Slag incorporation slag reduction structure in the steelmaking process, characterized in that the slag blocking plate 10 of the shape is to be maintained at a position away from the nozzle 130 so that the molten steel flow space is set so that the molten steel flow is not disturbed.