JPH0926269A - Method for lining unshaped refractory - Google Patents

Abstract

PROBLEM TO BE SOLVED: To strengthen the connecting part of bricks or castable refractory remaining in the inner wall of a container for a high temperature and newly constructed castable refractory. SOLUTION: The invention relates to a method for newly lining castable refractory after expansible metal materials are provided on the connecting face of remaining bricks or the connecting face of previously constructed castable refractory, when the castable refractory are applied to the inner wall of a container for a high temperature. The castable refractory is one containing carbon. Further, the expansible metal material is desirably an expansible metal such as aluminium or an aluminium alloy or a gauze.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refractory material lined in a container used at a high temperature such as various molten metal containers such as a converter, a mixed piggy wheel, a ladle in an iron mill or an inner wall of a heating furnace It relates to the method of building or repairing.

[0002]

2. Description of the Related Art Conventionally, in the lining of a high-temperature container, in the case of additional construction for repairing irregular refractory materials, when supplementing irregular refractory materials such as stamp materials, the surface to be repaired is torn. However, such consideration is not usually given in pouring construction. Also,
As a method of repairing high temperature containers, when applying an irregular shaped refractory to the surface of the broken brick in the container, spray water on the brick surface to improve the wettability between the brick and the repair material, Adhesion has been improved.

[0003]

Problems to be Solved by the Invention From the occurrence of cracks at the joints of amorphous refractories used for the lining of high temperature containers and intrusion of metal into the cracks, or from the bonding surface of irregular refractories to bricks. The peeling of the amorphous refractory is the main cause of damage to the irregular refractory, and from the viewpoint of improving the durability of the irregular refractory, the stabilization of the joint surface is of great concern.

According to the present invention, when an amorphous refractory is applied to the inner wall of a container for high temperature of various molten metals, the remaining amorphous refractory or brick is joined to the newly applied amorphous refractory at a joint surface. It is intended to provide a method for constructing an amorphous refractory having stable adhesive properties after the construction is carried out until the temperature rises after use.

[0005]

[Means for Solving the Problems] When an amorphous refractory is applied to the inner wall of a high-temperature container, a stretchable metal material is applied to the joining surface of the irregular refractory or brick to be newly applied with the remaining irregular refractory or brick. For example, they have found that the adhesiveness between them can be improved by disposing an expanded metal, a wire mesh, or the like, and have made the following inventions.

(1) According to the invention of claim 1, when the amorphous refractory is applied to the inner wall of the high temperature container, the joint surface with the remaining brick or the joint surface with the irregular refractory previously applied, A method for constructing an amorphous refractory, which comprises arranging a stretchable metal material and then newly constructing an irregular refractory.

(2) According to the second aspect of the present invention, one or both of the remaining brick or the irregular refractory previously constructed and the irregular refractory newly constructed are carbon-containing irregular refractory. The method for constructing an irregular refractory material according to claim 1, wherein

(3) The invention of claim 3 is characterized in that the stretchable metal material is an expanded metal of aluminum or aluminum alloy or a wire mesh, and the irregular refractory material is constructed. Is the way.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is, for example, a brick or an amorphous refractory when a container is manufactured by connecting an amorphous refractory by connecting to a permanent brick of a container for high temperature such as for molten metal. When adding an irregular shaped refractory to the furnace wall of a high temperature vessel, or when the furnace wall of a high temperature vessel constructed of brick or irregular refractory is damaged,
It is applied when repairing the part using an irregular refractory.

The material for the newly constructed amorphous refractory used in the present invention is not particularly limited, and any of basic materials such as magnesia, neutral materials such as alumina, and acidic materials such as silica can be used. It can be used and is appropriately selected according to the material of the remaining brick or the amorphous refractory.

The present invention is characterized in that a stretchable metal material is disposed on the joint surface between the irregular refractories or the joint surface between the irregular refractory and the brick. Here, “arrangement” means a construction method such as insertion, setting, and embedding. As the stretchable metal material, an expanded metal or a wire mesh is desirable because it can easily follow the expansion and contraction of the refractory during use and can be obtained relatively easily.

The opening of the expanded metal or wire mesh used is not particularly limited, but it is preferably 1.5 times or more of the maximum particle size of the raw material of the amorphous refractory used. This is because the amorphous refractory material can freely move through the openings of these metal materials.

The wire diameter in the case of wire mesh and the plate thickness of the material in the case of expanded metal are preferably 0.1 to 3 mm. This is because if the plate thickness is less than 0.1 mm, the strength of the metal material is insufficient, and if it exceeds 3 mm, it becomes difficult to dispose the metal material along the construction surface.

Expanded metal is JIS G 33
A thin plate or a medium-thick plate as specified in No. 51 is extended into a diamond mesh shape, and its shape is as shown in FIG. The thickness of expanded metal is
It is given by d in FIG. 1, but it can be freely adjusted by the step size (w / 2) and the mesh size (1) at the time of metal working, and the shape shrinkage rate ((d-t ) / D
(%)) Can be set arbitrarily.

As the elastic metal material of the present invention, a material such as iron or aluminum is used, but if the amorphous refractory or the brick is carbonaceous, it is preferably made of aluminum or aluminum alloy. This is because aluminum or the like reacts with the carbonaceous refractory when the temperature of the container becomes high, and has the effect of adhering between the brick and the amorphous refractory.

When a stretchable metal material is placed in a high temperature container and an amorphous refractory is installed, the material forming the amorphous refractory moves through the meshes of the stretchable metal material, and the amorphous fireproof. In addition to the adhesiveness of objects, the elastic metal material is more firmly fixed to the amorphous refractory material by the biting effect.

When the material can be moved from both sides of the stretchable metallic material, such as in the case of additional construction of an irregular shaped refractory, the biting effect is particularly exerted. If the remaining surface is hard like brick, 1m of elastic metal material
Similarly, by firmly fixing about 5 to 10 places per ² by using anchors such as wedges, it is possible to firmly join them.

Further, when the remaining bricks, the amorphous refractory, or the irregular refractory to be constructed contains carbon, the elastic metal material made of aluminum or aluminum alloy can be used for heat treatment. The adhesiveness between them becomes stronger. Although the mechanism of this adhesion is not clear, it is presumed that aluminum reacts with carbon in the heat to form aluminum carbide, which causes the carbon-containing refractories to adhere to each other.

In the construction method according to the present invention, a stretchable metal material having a predetermined thickness is arranged on the surface of the remaining amorphous refractory or brick, and the irregular refractory is constructed on the metal material.
Conventional methods such as pouring, spraying, baking, and stamping can be applied to this construction.

[0020]

【Example】

Example 1 The lining of a blast furnace ladle that conveys hot metal from a blast furnace has an amorphous shape in which a slag line portion (a lining portion that contacts slag) and a metal line portion (a lining portion that contacts hot metal) are made of different materials depending on the damage mode. It is lined with refractory. Table 1 shows the materials and characteristics of each amorphous refractory.
Shown in In the conventional construction, in order to prevent both materials from mixing with each other, the slag line portion was cast about 1 hour after casting the metal line portion first.

The life of the lining is 285 ch on average
(Average of n = 15). Both materials of the slag line part and the metal line part have durability of 300 ch or more, but at a rate of about 1 in 10 pots, cracks supposed to be caused by the difference in thermal expansion of both materials cause slag line and metal. It occurs at the boundary with the line and the pot life is 200-250c.
It was a life of h.

[0022]

[Table 1]

As a countermeasure against this, after pouring the metal line material, an aluminum wire mesh having a wire diameter of 1.2 mm and an opening of 16 mm was arranged at the joint portion, and thereafter, the slag line material was poured as in the conventional case. As a result, the average life was 324 ch (n = 10 average), and no cracks were observed at the boundary between the slag line portion and the metal line portion.

Example 2 12 wt% of carbon was added to the floor (bottom) of the blast furnace pot of Example 1.
%, Alumina containing 5 wt% of silicon carbide / silicon carbide /
Uses carbon brick. The main damaged part is the hot water contact part, and since 200 ch has passed, the stamp material made of the same material as the brick has been used for cold repair.

Conventionally, the surface of the brick on the repaired part (about 1
m × 1.5 m) was wetted with water and then the stamp material was applied. This repaired part is provided with an expanded metal with an opening of 15 mm × 20 mm made by processing an aluminum plate with a thickness of 1 mm, and the 12 parts of the expanded metal are fixed to the joint part of the brick using wedges, and then the stamp material is applied in the same manner as in the past. did. Table 2 shows the results.

[0026]

[Table 2]

As shown in Table 2, according to the construction method of the present invention, the life of the floor portion was 140% of the average life of the conventional method.

[0028]

INDUSTRIAL APPLICABILITY As described above, in the present invention, a stretchable metal material such as expanded metal or wire mesh is provided at the joint between the irregular refractories or the joint between the irregular refractory and the brick. This strengthens the bonding at the portion where the stretchable metal material is arranged.

Further, when the amorphous refractory or the brick is made of aluminum and aluminum or aluminum alloy is used, the effect of adhering the brick or the irregular refractory is particularly remarkable. Therefore, the life of a high temperature vessel, for example, a blast furnace pot can be extended and the number of repairs can be reduced, so that there are great technical and economic effects.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of the shape of expanded metal.

Continuation of the front page (72) Hidee Tanaka Hideei Tanaka 1-2 1-2 Marunouchi, Chiyoda-ku, Tokyo Inside Nihon Steel Pipe Co., Ltd. Shigeyuki Nagashi 2 of 433 Koto Nishi, Bizen City, Okayama Prefecture (72) Inventor Tai Minoru Mizuta 53 of 67 Nagaoka, Okayama City, Okayama Prefecture

Claims (3)

[Claims] 1. When an amorphous refractory material is applied to the inner wall of a high temperature container, a stretchable metal material is provided on the joint surface with the remaining brick or on the joint surface with the previously formed amorphous refractory material. A method for constructing an irregular refractory, characterized by newly constructing an irregular refractory after installation. 2. One or both of the remaining joint surface with the brick or the irregular refractory previously constructed and the irregular refractory newly constructed is a carbon-containing irregular refractory. The method for constructing an amorphous refractory according to claim 1. 3. The method for constructing an amorphous refractory according to claim 1 or 2, wherein the elastic metal material is an expanded metal of aluminum or an aluminum alloy or a wire mesh.