JPH07303957A - Structure of side wall part of molten metal vessel - Google Patents

Abstract

PURPOSE:To simplify a lining application and a drying and to obtain the structure of a side wall part of a molten metal vessel by using both applications of divided precast blocks and monolithic refractory. CONSTITUTION:In the divided preset block 1 to the side wall of the molten metal vessel, the projecting part or the recessed part is arranged to the side surface of this divided precast block 1 and also, the application of the monolithic refractory 2 is executed between the blocks 1. Then, the monolithic refractory 2 is applied at >=5mm thickness, desirably >=10mm thickness to the vertical joint between the divided precast blocks 1. By this method, the side wall of the large large scaled molten metal vessel can be worked with the dense precast block 1, and the lining application and the drying are simplified and at the time of repairing, the structure of the side wall part without penetration of molten metal is obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for lining a side wall of a molten metal container with a precast block of an amorphous refractory and an amorphous refractory in combination.

[0002]

2. Description of the Related Art A conventional molten metal container such as a ladle and a tundish has a perm lining (lining) and a work lining (lining) made of bricks. Recently, amorphous refractories have been used instead of bricks for the purpose of labor saving in furnace construction work. For example, Japanese Patent Laid-Open No. 2-
6373, JP-A-2-225279, JP-A-4-50178, JP-A-4-59665 and the like. However, even if it is possible to improve workability by lining with irregular refractory compared to brick construction,
It takes a long time to dry after lining.

As a method for shortening the drying time, metal aluminum powder, organic fiber, organic foaming agent, etc. are used as an explosion proof agent during drying. If the addition amount is increased in order to improve the diffusion of water vapor, the drying time can be shortened, but the structure of the construction body of the amorphous refractory is not dense and the corrosion resistance and the infiltration resistance are deteriorated.

Therefore, in order to shorten the drying time for the user and to provide a dense construction body, an amorphous refractory containing less explosion-proof agent is used only in a small metal container. A method of molding this in advance and setting a dense precast block, which is an integral body that has been dried by an optimum heating curve, inside the can body container is used.

[0005]

However, the use of a precast block of a large-sized molten metal container, for example, in this case, an indefinite refractory material in a ladle is limited to the floor part, and an attempt to set the side wall part with the precast block is made. Not done. This is because it is difficult to provide a large, one-piece precast block. In order to solve this problem, a divided precast block molded into an appropriate size is conceivable, but simply by dividing a large precast block and combining it, the contact surface of both blocks becomes a flat contact and the adhesion is weak, Molten metal joint
This may cause intrusion of metal from the (joint part) and insertion of metal into the back of the refractory lining and a molten metal leak accident.

[0006]

According to the present invention, a divided precast block 1 having a convex portion or a concave portion is provided on the side wall of a molten metal container such as a ladle or a tundish, and the divided precast block 1 is provided next. The amorphous refractory 2 is installed in the gap between the divided precast blocks 1. As a result, the contact area between the divided precast block 1 and the amorphous refractory 2 is increased, and the adhesion is increased, so that the infiltration of molten steel can be prevented without any difference from the large-scale integral structure.

The divided precast block 1 and the amorphous refractory 2 used preferably have expansion characteristics and are preferably made of the same material. However, when the divided precast blocks are combined with different materials, it is necessary to select a material that does not react.

Refractory materials used for the divided precast block 1 and the amorphous refractory 2 of the present invention include alumina-based, alumina-silica-based, alumina-spinel-based,
Alumina-Chromium system, Alumina-Magnesia system, Zircon system, Alumina-Carbon system, Alumina-Magnesia-
Materials such as chrome, alumina-magnesia-carbon, and magnesia-carbon can be used, and the combination of materials for the divided precast block 1 is not particularly limited.

The cross-sectional shape of the divided precast block depends on the melting damage condition during use.

In the vertical block 1'shown in FIG.

FIG. 9 is a tilt block 1 ″ having a tilt as shown in FIG.
Any of

For the construction of the irregular refractory material 2, it is preferable to install a mold (core) corresponding to the thickness of the divided precast block 1 arranged on the side wall lining and cast it.
In addition to this, iron coating, gun spraying, ramming construction, plastic construction, etc. can also be used. The vertical joint gap is 5 mm
If it is more than 10 mm, it can be installed, but if it is 10 mm or more, the filling property of the amorphous refractory 2 is good. If it is less than 5 mm, the filling property is poor and the shrinkage during use becomes large, which causes insertion of the metal.

The combination of the shape of the convex portion or the concave portion on the side surface of the divided precast block 1 and the irregular refractory 2 may be any of those shown in FIGS. 3, 4 and 5, and the joint surface area a of the divided precast block is a / ( b × h) 1.02 ~
Any shape is acceptable as long as it satisfies the range of 4.00. Preferably
It is in the range of 1.05 to 3.00. The reason is that a / (b
When xh) is less than 1.02, the joint surfaces of both blocks are in flat contact with each other and the adhesion is weak and molten metal is likely to infiltrate from the joints. If a / (b × h) is larger than the range of 4.00, the unevenness of the contact surface of the divided precast block will be large and the thickness will be thin, and the strength will be lost. It may cause the insertion of bullion from the point. Further, the amorphous refractory 2 constructed at the joint with the divided precast block 1 enhances the effect of preventing molten steel from entering.

FIG. 6 is preferably thicker than the divided precast block as shown in FIG.

[0012]

The present invention will be described in more detail below by showing examples of the present invention. In this embodiment, a divided precast block 1 and an amorphous refractory 2 are placed in a 120 ton ladle.

[Fig. 11] Construction was performed as shown in Fig. 11. First, place the perm brick 3 inside the iron skin of the ladle, carry in the divided precast block 1 inside with a crane, install at equal intervals, and attach the divided precast block 1 to the perm brick 3 when installing the formwork. Then, the cast refractory 2 was constructed.

The divided precast block 1 is made of Al ₂ O ₃ 91.
Wt% and MgO 6 wt% are used and the side surface has a concave structure.

[Figure 4] And, for comparison, the other

FIG. 7: The side wall work lining was formed into a structure as shown in FIG. 7 and dried at high temperature. The amorphous refractory 2 used is the same material as the block.

After completion of ladle construction, after 24 hours of curing, deframed,
Immediately after receiving molten steel at 1600 ° C for 5 hours with preheating, there was no hindrance to the lining up to 180 ch, and the divided block and the amorphous refractory were sintered and could be used repeatedly as a unitary structure. However, in the situation of dismantling, the concave structure

[Fig. 4] Although there was no insertion of the bullion at

[Fig. 7] In the area of Fig. 7, ingots were found in the gap between the perm brick 3 and the divided precast block 1 in the area of 1500 × 500 mm.

[0015]

By using the side wall structure of the present invention,
The side wall of a large molten metal container can be constructed with a dense precast block, which shows excellent durability. By doing so, the lining construction and drying can be simplified, and even when repairing, the insertion of the metal is eliminated and the permanent tension can be used semipermanently. The lining construction method of the present invention has a side wall structure that brings excellent effects, and can be applied to all molten metal containers as well as ladle.

[0016]

[Brief description of drawings]

FIG. 1 is a sectional view of a sidewall structure of the present invention.

FIG. 2 is a plan view of a side wall structure of the present invention.

[Figure 3]

FIG. 6 is an enlarged sectional view of a joint portion of the divided precast block of the present invention and an amorphous refractory material.

FIG. 7 is an enlarged cross-sectional view of a comparative example.

[FIG. 8]

FIG. 9 is a sectional view of a divided precast block.

FIG. 10 is a joint surface view of a divided precast block.

FIG. 11 is a sectional view of a side wall structure showing an example of the present invention and a comparative example.

[Explanation of symbols]

 1 ・ ・ ・ ・ Split precast block 1 '・ ・ ・ Split precast vertical block 1 ″ ・ ・ ・ Split precast slant block 2 ・ ・ ・ ・ Amorphous refractory 3 ・ ・ ・ ・ ・ ・ Permanent brick a ・ ・ ・ ・Surface area b ・ ・ ・ ・ Thickness of precast block h ・ ・ ・ ・ ・ ・ Height of precast block

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location F27D 1/16 F

Claims (3)

[Claims] 1. A side wall structure for a molten metal container, wherein an amorphous refractory is applied between the blocks in the construction of a divided precast block on the side wall of the molten metal container. 2. The side wall structure of the molten metal container according to claim 1, wherein the side surface of the divided precast block has a convex portion or a concave portion. 3. The side wall structure of the molten metal container according to claim 1, wherein an irregular refractory material is applied to a vertical joint between the divided precast blocks with a thickness of 5 mm or more.