KR200230184Y1 - Equipment preventing slag of tundish for manufacturing steel from emitting - Google Patents

Abstract

In the present invention, molten steel supplied from a ladle to a tundish in a steelmaking facility is supplied to a post-treatment device, and slag mixed in the molten steel is a post-treatment device. Slag outflow prevention device for steelmaking tundish to prevent the supply to the.

The present invention is equipped with a sleeve (Sleeve) that can be easily manufactured at a low cost and installed on the top of the nozzle of the tundish to close the nozzle until a certain amount of molten steel is supplied in the tundish so that the slag mixed in the molten steel To ensure that the sliding gate is gradually heated to prevent the breakage of the valve, and after a certain amount of molten steel is supplied, the sleeve floats to open the nozzle so that only the clean molten steel is post-processed. It is intended to be supplied to the device.

Description

Equipment preventing slag of tundish for manufacturing steel from emitting}

In the present invention, the molten steel supplied from the ladle to the tundish in the steelmaking facility is supplied to the post-treatment apparatus, and the slag mixed in the initial molten steel is post-treated. Slag outflow prevention device for steelmaking tundish to prevent leakage to the device.

Usually, steelmaking equipment is configured to supply molten steel of ladle to a post-treatment apparatus via a tundish, and these facilities are made of materials having high refractory and melting point since molten steel of high temperature passes through them.

In addition, the molten steel supplied through the nozzle from the tundish needs to be supplied or cut off as necessary, thereby providing a sliding gate at the end of the nozzle.

On the other hand, slag is necessarily present in the molten steel, when the initial slag is supplied with the molten steel to the after-treatment device because the defective product is generated by the slag, means for preventing the supply of the slag to the after-treatment device is required.

Thus, a 'tendish slag outflow prevention mechanism' such as Utility Model Publication No. 1988-0002058 has been proposed, and 'Tundish nozzle opening and closing device for continuous casting equipment' such as Utility Model Registration No. 206014 has been proposed. However, in the former case, the stopper installed at the top of the nozzle opens and closes the nozzle of the tundish, and the main body is guided and lifted by the stopper, so that the slag separated from the flotation centers the stopper as described in the effect of the specification. It collects in V shape and is discharged (supplied) to the nozzle with a small amount of molten steel, and the air pressure acts according to the height of the molten steel, and the molten steel passes through the narrow gap between the nozzle and the stopper, so that the flow velocity becomes faster, and the cavity As the phenomenon occurs, the slag is sucked out along the molten steel which is rapidly discharged. In the latter case, a stopper operated in a seesaw manner is configured to open and close the nozzle of the tundish, so that when the molten steel is supplied to the tundish while the nozzle is closed with the stopper, the flotation is separated while a certain amount is supplied. When the slag with a low specific gravity rises to the molten steel surface, the nozzle opening and closing device is gradually heated to prevent damage to the nozzle opening and closing device, and after the predetermined amount of molten steel is supplied, the stopper is raised by a seesaw device, The molten steel in the open state is supplied to the aftertreatment device through the nozzle, which can prevent the slag from being mixed into the molten steel supplied to the aftertreatment device, but, after the end of one working process, The area where molten steel or slag is in contact is cooled while the remaining molten steel and slag are fused to ensure the next work process. As all the contacted parts of the opening must be replaced with new ones, the costly manufacturing cap must be discarded and the labor required to replace them with new caps adds to the economic waste and the product becomes expensive. There is a problem that the installation cost is additionally required to secure the equipment area and construction cost, which must be provided separately from the type device, and the facility cost becomes expensive along with the enlargement of the facility.

The present invention is equipped with a sleeve (Sleeve) that can be easily manufactured at a low cost and installed on the top of the nozzle of the tundish to close the nozzle until a certain amount of molten steel is supplied in the tundish, so that after a certain time in the molten steel Floating separation of mixed slag and clean steel is made, and after a certain amount of molten steel is supplied, the sleeve floats due to the specific gravity difference so that the nozzle is opened so that only clean molten steel is supplied to the aftertreatment device.

Figure 1a to 1d is a step-by-step operating state of the present invention.

2a and 2b are a perspective view and a partially enlarged cross-sectional view of the sleeve according to the present invention.

Figure 3 is a cross-sectional view showing another embodiment of the sleeve according to the present invention.

-Explanation of symbols for the main parts of the drawings-

1: Ladle 2: Tundish 3: Main Body

4: fireproof 5: nozzle

6: sliding gate

7 aftertreatment device 8 molten steel 9 slag

10: Sleeve 11: Ceramic fiber

12: pore θ: tilt angle

Molten steel in which slag 9 is mixed from ladle 1 in tundish 2 having inner surface of main body 3 covered with refractory material 4 and nozzle 5 formed on one side with opening and closing with sliding gate 6. In a steelmaking facility in which (8) is supplied so that molten steel (8) is supplied to the aftertreatment device (7) through the sliding gate (6),

By vacuum forming the ceramic fiber 11, the sleeve 10 having pores 12 between the ceramic fibers 11 is formed in a cylindrical shape so as to be separate, and the sleeve 10 of the tundish 2 is formed. It is configured to be mounted in the upright state on the top of the nozzle (5).

The sleeve 10 is preferably to have a specific gravity of 0.15 ~ 0.65g / cm ³ , it may be to have an inclination angle (θ) of 2 ° ~ 10 ° by reducing the lower diameter of the lower portion.

The present invention configured as described above has the molten steel 8 from the ladle 1 in a state in which the sleeve 10 is mounted upright on the nozzle 5 of the tundish 2 in an initial state as shown in FIG. 1A. Is supplied to the tundish 2, since the nozzle 5 is closed by the sleeve 10, the molten steel 8 accumulates in the tundish 2, and in the process, the molten steel 8 The mixed slag 9 floats and separates from the molten steel 8 by the specific gravity difference lighter than the molten steel 8, and floats to the surface of the molten steel 8, so that the molten steel 8 is filled to an appropriate height as shown in FIG. 1B. When the sleeve 10 rises to the surface of the molten steel 8 by buoyancy due to the specific gravity difference with the molten steel 8, the molten steel 8 in the clean state as shown in FIG. The molten steel 8 which is continuously supplied from the ladle 1 while being supplied to the aftertreatment device 7 through the gate 6 is continuously discharged. As the development progresses, the slag 9 floats on the surface of the molten steel 8 to continuously supply the molten steel 8 in a clean state to the post-treatment device 7, and the molten steel 8 in the tundish 2 with a predetermined amount. When the molten steel 8 is exhausted by the supply to the aftertreatment device 7 in a state in which the supply is further cut off, the slag 9 is bottomed of the tundish 2 as shown in FIG. It remains on the surface and the sleeve 10 also sinks to the bottom with the slag 9 and cools to complete one working process. After the cooling is completed, the slag (2) from the main body 3 of the tundish 2 is completed. 9) and the sleeve 10 are discarded together, and a new refractory material 4 is installed on the inner surface of the main body 3 and a new sleeve 10 is mounted on the top of the nozzle 5 to preheat the standby state of the next work process. To be.

Meanwhile, as illustrated in FIG. 1B, the molten steel 8 is blocked by the sleeve 10 to discharge to the nozzle 5 for a predetermined time, so that the heat of the molten steel 8 is reduced by the refractory material 4 and the main body 3. The thermal conduction phenomenon gradually occurs to the sliding gate 6 through the thermal expansion to gradually progress in each component of the sliding gate 6, so that the sleeve 10 rises as shown in FIG. 1C, and the molten steel 8. Even if the direct contact with the sliding gate 6, the sliding gate 6 is not broken.

In addition, the sleeve 10 may adjust the specific gravity by adjusting the pores 12, but if molded to have an inclination angle (θ) even under the same specific gravity, the buoyancy can be increased, the type of molten steel (8) It will be able to apply accordingly.

As described above, the present invention is provided with a separate sleeve at low cost and is simply applied in every work process to separate and separate the slag mixed in the initial molten steel so that only molten steel in a clean state is supplied to prevent defective products from occurring. It will provide a useful effect.

Claims (2)

Molten steel in which slag 9 is mixed from ladle 1 in tundish 2 having inner surface of main body 3 covered with refractory material 4 and nozzle 5 formed on one side with opening and closing with sliding gate 6. In a steelmaking facility in which (8) is supplied so that molten steel (8) is supplied to the aftertreatment device (7) through the sliding gate (6), By vacuum forming the ceramic fiber 11, the sleeve 10 having pores 12 between the ceramic fibers 11 is formed in a cylindrical shape so as to be separate, and the sleeve 10 of the tundish 2 is formed. Slag leakage prevention device of the steelmaking tundish, characterized in that configured to be mounted in the upright state on the nozzle (5). 2. The slag outflow prevention device of a steelmaking tundish according to claim 1, wherein the sleeve (10) is made to have an inclination angle (θ) of ∠2 ° to ∠10 ° by reducing the downward diameter.