JPH0345943Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the structure of a gas injection refractory for injecting inert gas, mainly argon, into molten metal, and is designed to ensure safe and reliable construction into molten metal containers. The purpose is to withstand repeated use.

BACKGROUND ART In recent years, a technique of blowing inert gas such as argon or nitrogen into molten metal has become popular for the purpose of floating nonmetallic inclusions, regulating and uniformizing temperature, or promoting reactions in molten metal. Particularly in special scouring, the top blowing method using a lance pipe and the bottom blowing method using a porous plug are commonly used at present. Among these, the porous plug for gas injection used in the down-blowing method has a structure in which the outer periphery and bottom of the porous refractory are surrounded by an iron plate case with a gas supply pipe, and a structure in which the outer periphery of the porous refractory is surrounded by a dense refractory. enclosure, a structure in which the entire outer periphery and bottom of a porous refractory or a dense refractory are surrounded by an iron plate case with a gas supply pipe; Various structures such as hole structures (see, for example, Japanese Utility Model Application Publication No. 58-27347 and Japanese Utility Model Application Publication No. 58-34943) have been adopted or proposed.

However, in both cases, as shown in Fig. 1, plug bricks 2 and mass bricks 3 are manufactured separately, and the plug bricks are placed in the holes of mass bricks 3 that are installed in molten metal container 1 at the construction site. 2,
Alternatively, a method has been adopted in which plug bricks 2 and sleeve bricks (not shown) are assembled in advance, and refractory mortar is attached around them, and the construction is carried out from the outside bottom of the molten metal container 1. There is a problem like this.

(1) Since the construction is carried out from the outside bottom of the molten metal container 1, it is necessary to make a hole at least larger than the maximum outer diameter of the plug brick 2 in the bottom of the molten metal container 1, and in order to fix the plug brick 2, for example. It is necessary to install a fixing jig 5 using a cotter method or a bayonet method.

(2) In order to fix the plug brick 2, a receiving brick 4 may be required on the back of the plug brick 2 installed at the inner bottom of the molten metal container 1.

(3) When constructing plug bricks 2 to mass bricks 3, it is necessary to tilt the molten metal container 1 and construct with refractory mortar.

(4) Since the plug bricks 2 are applied to the molten metal container 1 from the outside bottom using refractory mortar, if the plug bricks 2 are not installed securely, there is a risk that the joints will become thick or slant. There is a risk of steel leakage.

The present invention solves such problems and is an assembly of plug bricks and sleeve bricks, the outer periphery of which is surrounded by an iron plate case with holes that allow hanging, and the bottom part of which is surrounded by an iron plate case with a gas supply pipe. A refractory for gas injection that can be safely and reliably installed in a molten metal container by having a structure in which the surrounding mass bricks are integrated in advance and can withstand multiple uses. It is.

Below, Figures 2 to 3 show an embodiment of the present invention.
This will be explained in detail based on the diagram.

The outer periphery and bottom (gas injection side) of a plug brick 2 manufactured in a predetermined shape are surrounded by iron plate cases 8 and 9. The iron plate case 8 surrounding the outer periphery has a hole 7 through which it can be hung, which is necessary when constructing the molten metal container 1 with a mass brick equivalent portion made of monolithic refractory material, which will be described later. It is surrounded using an iron plate case 8, and a hole with a diameter of about 15 to 20 φm/m is provided for hanging through an iron rod or wire during construction. The bottom part is surrounded by an iron plate case 9 having a gas supply pipe 6. Next, a sleeve brick 11 manufactured to be able to fit into the plug brick 2
The plug bricks 2 surrounded by the iron plate cases 8 and 9 are assembled with the sleeve bricks 11 using refractory mortar at the joints. By forming the predetermined shape around the plug brick 2 and sleeve brick 11, which have been assembled in advance in this way, using the monolithic refractory 10, and carrying out the integral construction, it is possible to use for gas injection. Consists of refractories.

In the example, the height of the iron plate case 8 that surrounds the outer periphery is extended to the top surface (gas discharge side) of the plug brick 2, and is constructed by surrounding the entire outer periphery. In order to prevent steel leakage as much as possible, the height of the plug brick 2 may be reduced to about 2/5, and only the outer periphery of the bottom side may be surrounded and only the portion having the hanging hole 7 may be extended. However, in any case, the part with the hanging hole 7 is made longer than the height of the plug brick 2, and the monolithic refractory 10 is formed into a predetermined shape and the weight of the integrally constructed part is 40~ The weight is about 80 kg, so in order to suspend this heavy object, the strength of the suspension hole 7 of the steel plate case 8 must be strong enough to withstand tensile and shear failure. Although it depends on the thickness, the dimension (w) of the hole in the tensile failure direction is 3 as shown in Figure 3.
~8m/m, the dimension (h) in the shear failure direction is 10
It is important for safety to maintain a distance of ~15m/m. The outer shape of the hole iron plate has various shapes such as semicircle, square, and polygon, and the hanging hole 7 is not limited to only a circular shape. There is a method of shrink fitting, and there are no restrictions on the height of the iron plate case 8 surrounding the outer periphery and the surrounding means, and there are no restrictions on the structure or material of the plug brick 2 itself.

As a means of integrally constructing the periphery of an assembly in which sleeve bricks 11 are assembled in advance to plug bricks whose outer periphery and bottom are surrounded by iron plate cases 8 and 9, a predetermined shape is formed using monolithic refractories 10. , Using a metal frame or a wooden frame manufactured in a predetermined shape, the assembly of the plug brick 2 and the sleeve brick 11 is placed in the frame, the periphery is filled with the monolithic refractory 10, vibration molding is performed, and compaction is performed. A predetermined shape is formed by means of construction, pouring, etc., and after removing the frame, it is sufficiently dried to form an integrated product.

By using the gas injection refractory of the present invention with such a structure, passing an iron rod or wire through the suspension hole during construction, lifting it with a crane, etc., and drilling the hole from the inside at a predetermined position of the molten metal container. It is only necessary to make a hole in the bottom of the molten metal container that is large enough for the gas supply pipe to pass through, making construction extremely safe, reliable, and easy without having to tilt the molten metal container. No tools are required, and it can be installed by passing an iron rod or wire through the hanging hole and lifting it with a crane, etc.
It is extremely easy to construct, and since it is a one-piece product, there is no steel leakage from the joints and it can be safely used many times.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view of a conventional gas injection plug installed in a molten metal container, Figures 2 and 3
The figure shows an embodiment of the present invention. Figure 2 is a longitudinal cross-sectional view of a pre-assembled plug brick and sleeve brick that are integrated into a predetermined shape with monolithic refractory material, and Figure 3 is a hanging A partial detailed view of the lowering hole. In the figure, 1 is a molten metal container, 2 is a plug brick,
3 is a mass brick, 4 is a receiving brick, 5 is a fixing jig, 6 is a gas supply pipe, 7 is a hole for hanging, 8 is an iron plate case, 9 is an iron plate case, 10 is a monolithic refractory, 11 is a sleeve Brick.

Claims (1)

[Scope of utility model registration request] Iron plate case 8 having a hole 7 that allows the outer periphery to be hung
A sleeve brick 11 is fitted into a plug brick 2 surrounded by an iron plate case 9 having a gas supply pipe 6 at the bottom, and a predetermined shape is formed around this assembly using a monolithic refractory 10. A refractory for gas injection, characterized in that it is integrated before installation.