JPH0230368A - Method for preventing sticking of metal on inner wall face in bubbling snorkel and protector for preventing sticking of metal - Google Patents

Abstract

PURPOSE:To prevent direct sticking of molten steel splash and erosion of a snorkel by coating inner wall face in the refractory-made snorkel with sector- like protector dividing into plural number, sticking the molten steel splash on the surface and dropping the protector with the stuck weight. CONSTITUTION:As the inner wall face of the refractory-made snorkel 3 for using at the time of bubbling is covered with plural protectors 6 formed with ceramic fiber, the molten steel splash is not directly fitted to the inner wall face of the snorkel 3, and erosion of the snorkel 3 is prevented. Further, the protector 6 is constituted with assembling of protector pieces 7 divided into the plural number and as the projected edge 7B at upper end part thereof is arranged circularly in order by hooking to the upper end edge of inner circumference of the snorkel 3, the fitting work is facilitated, and when the molten steel sticks to the expected weight, the protector 6 can be naturally dropped with the stuck weight.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Field of Application) The present invention is directed to a bubbling snorkel that is used when bubbling molten steel in a ladle with argon gas or the like. A method for preventing metal adhesion to prevent
The present invention also relates to a protector for preventing metal adhesion used to carry out this method.

(Prior Art) As shown in FIG. 4, a snorkel 3 is provided to surround the injection lance 2 when the molten steel in the ladle 1 is bubbled with argon gas or the like using the injection lance 2.

This snorkel 3 is made into a cylindrical shape from a monolithic refractory material, and is attached to a support member 5 on the building side via attachment parts 4, 4 at the upper end thereof. The figure indicates the hot water level in the ladle 1.

(Problem to be Solved by the Invention) However, in the above bubbling, splatter is generated during bubbling, and the droplet adheres to the inner surface of the snorkel 3. This deposit gradually accumulates in proportion to the number of times of scouring, as shown by the chain line in FIG. 4, and eventually the inner diameter d becomes so narrow that it becomes impossible to insert the injection lance 2.

Conventionally, as a countermeasure against this problem, a mechanical impact force is applied to the snorkel 3 to peel off the adhered molten steel droplets, but once the molten steel has adhered, it is difficult to peel off.
Since this method is not essentially a means for avoiding adhesion of molten steel droplets, it cannot be a fundamental solution to the above-mentioned problems.

In view of this, the present invention provides a method for preventing metal adhesion on the inner wall surface of a bubbling snorkel, which prevents molten steel splash from adhering to the inner wall surface of the snorkel and solves the problems of the prior art, and a direct method for implementing the method. This was done for the purpose of providing a protector for use.

[Structure of the invention]

(Means for Solving the Problems) In order to solve the problems of the above-mentioned prior art, the present invention provides the following:
A sector-shaped protector made of ceramic fiber and divided into multiple sections is attached to the inner wall surface of a refractory snorkel used for bubbling to cover the inner wall surface, and molten steel droplets adhere to the surface of this protector. let me,
A method for preventing the adhesion of bare metal on the inner wall surface of a bubbling snorkel is characterized in that the protector falls off by itself due to its weight before the amount of adhesion reaches such a point that it becomes impossible to insert the injection lance, and in order to implement this method, a cylindrical A plurality of sector-shaped ceramic fiber protector pieces are provided in the axial direction so as to have an outer diameter close to the inner diameter of the refractory snorkel when assembled, and the inner wall of the snorkel is located above the outer surface of each of these protector pieces. A protector for preventing bare metal from adhering to the inner wall surface of a bubbling snorkel, characterized in that a ridge is formed to be hooked to the upper edge, and the protector piece is suspended and supported along the inner wall surface of the snorkel by the ridge. .

(Function) By sequentially hooking the projecting edges of the protector pieces to the upper edge of the inner circumference of the snorkel, the inner circumferential surface of the snorkel is covered with the protector, and droplets of molten steel scattered during bubbling adhere to the surface of the protector. This prevents molten steel droplets from directly adhering to and accumulating on the inner peripheral surface of the snorkel, thereby preventing damage to the snorkel. When the amount of adhered molten steel increases to the point where it becomes impossible to insert the injection lance, the protector piece naturally falls into the ladle due to the weight of the adhered molten steel.

(Embodiments) The present invention will be described below with reference to embodiments shown in FIGS. 1 to 3, with the same reference numerals assigned to the same members as in FIG. 4.

The snorkel 3 is formed into a cylindrical shape using a monolithic refractory material as in the past, and has a required number of mounting portions 4.4 integrally provided on the outer side of its upper end. 4 is suspended from a support member 5 of a part of the building.

The protector 6 is made of ceramic fiber, and when assembled into a cylindrical shape, the snorkel 3
It is constituted by a plurality of sector-shaped protector pieces 7, 7, .

As one of the protector pieces 7 is shown in FIG.
B is formed, and a protrusion 7 with a lower height is also formed in the lower part.
C is formed so that the snorkel 3 can be hooked to the upper inner peripheral edge of the snorkel 3 by the protruding edge 7B. At the time of this latching, the lower end of the protector piece 7 has a length that hangs down to near the middle part of the snorkel 3 in the vertical direction, and at this time, the lower protrusion 7C is brought into close contact with the inner wall surface of the snorkel 3, thereby causing the protector piece 7 to A gap M is formed between the outer surface 7A of the snorkel 3 and the inner wall surface of the snorkel 3, and even if molten steel splashes adhere to the protector piece 7 and penetrate the protector piece 7 due to the amount of heat, it will directly contact the inner wall surface of the snorkel 3. I'm trying not to do that. Also protector piece 7
The back surface 7D of is made into a flat surface for convenience of molding.

Therefore, the projecting edges 7B of these protector pieces 7, 7...
are hooked to the upper edge of the inner periphery of the snorkel 3 and arranged one after another in an annular shape, and the joints between the adjacent protector pieces 7.7 are filled with mortar. The molten steel splash adhesion area on the inner wall surface of the protector 6
Since the molten steel is completely covered by the molten steel, droplets of molten steel scattered during bubbling adhere to the back surface 7D of the protector pieces 7, 7...
Direct adhesion to the inner wall surface of the snorkel 3 is prevented. The amount of this adhesion gradually increases until it becomes as shown by the chain line in Fig. 3, and when it approaches a state where it is impossible to insert the injection lance 2, a rotational moment acts due to the weight of the molten steel that has grown and adhered. Flange 7 of protector piece 7
Either the supporting force due to the hanging of B is lost and it comes off the upper inner edge of the snorkel 3, or the protrusion 7B breaks due to the vertical force due to the weight of the attached material and the protector piece 7
falls into ladle 1. After falling, the protector piece 7 floats up in the vortex in the ladle 1 due to its specific gravity and remains in the ladle 1 after the hot water is discharged from the bottom of the ladle 1, so it can be easily removed. .

〔Effect of the invention〕

As explained above, according to the present invention, since the inner wall surface of the snorkel used during bubbling is covered with a protector formed of ceramic fiber,
Splashes of molten steel do not directly adhere to the inner wall surface of the snorkel, and the snorkel is prevented from being melted and damaged. Further, the protector is composed of a set of protector pieces divided into a plurality of pieces, and these protector pieces can be sequentially arranged in an annular shape by hooking the projecting edge of the upper end to the upper edge of the inner circumference of the snorkel. This makes the attachment work easier, and when a predetermined amount of molten steel adheres to the protector piece, the weight of the adhered molten steel allows the protector piece to fall by itself, which has various effects.

[Brief explanation of the drawing]

Fig. 1 is a half vertical perspective view showing one embodiment of the present invention;
The figure is a perspective view showing one of the protector pieces in FIG.
FIG. 3 is an explanatory diagram showing how molten steel splashes adhere, and FIG. 4 is an explanatory diagram showing a conventional bubbling work device. 1... Ladle, 2... Injection lance, 3.
... snorkel, 6... protector, 7... protector piece, 7B... ridge, 7C... protrusion. Figure 1: Applicant's agent Mr. Sato Figure 2

Claims (1)

[Claims] 1. A sector-shaped protector made of ceramic fiber and divided into a plurality of sections is added to the inner wall surface of a refractory snorkel used for bubbling to cover the inner wall surface, and this protector A method for preventing bare metal from adhering to an inner wall surface of a bubbling snorkel, characterized by adhering droplets of molten steel to the surface of the protector and causing the protector to naturally fall due to its weight before the amount of adhesion reaches such a level that it becomes impossible to insert an injection lance. 2. A sector-shaped ceramic fiber protector piece divided in the axial direction so as to have an outer diameter close to the inner diameter of the refractory snorkel when assembled into a cylindrical shape is provided, and the upper part of the outer surface of each of these protector pieces is provided. The inner wall of the bubbling snorkel is characterized in that a ridge is formed to hang on the upper edge of the inner wall of the snorkel, and the protector piece is suspended and supported along the inner wall of the snorkel by the ridge. Prevention protector.