JPH0686001B2 - How to repair molten steel ladle wall - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a molten steel ladle wall, and more particularly to a method for repairing a molten steel ladle wall which has improved durability and can be reduced in unit consumption.

[0002]

2. Description of the Related Art As shown in FIG. 2, conventionally, a molten steel ladle wall 1 is made of a zircon castable refractory material formed on the inner side of the permanent tension members 2 and 3, and its upper end is Zircon brick 7 is piled up. Further, the bottom wall portion thereof is provided with a low stone brick constructed on the upper side of the permanent tensions 5, 6. As shown in FIG. 3, a local melting loss occurs on the molten steel ladle wall 1 during repeated use of the steel receiving, and such a local melting loss is repaired as follows. That is, after removing the slag on the surface of the locally melted portion, as shown in FIG. 4, for example, a high alumina phosphoric acid bond plastic refractory 8 having an alumina content of about 90% is struck to remove the locally melted portion. It is repairing.

An example of the components of the high alumina phosphate bonded plastic is shown in the table below.

[0004]

[Table 1]

However, the conventional molten steel ladle wall formed by such a procedure has a problem that the plastic refractory is peeled off after the number of steel receiving times is about 5, and the repair frequency is high.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for repairing a molten steel ladle wall which has improved durability and can be reduced in unit consumption. is there.

[0007]

A method for repairing a molten steel ladle wall according to the present invention comprises applying zircon mortar to a portion of the molten steel ladle wall requiring repair to achieve the above object. It is characterized in that a high alumina phosphate bonded plastic refractory was struck while it was in an undried state.

The undried zircon mortar and the plastic refractory applied to the mortar are dried and then used for receiving steel, but undried between the surface of the portion requiring repair and the plastic refractory. The interposition of zircon mortar increases the binding force between the molten steel ladle wall surface of the locally melted portion and the plastic refractory, so the durability is increased by, for example, about 1.5 times, and the repair frequency is reduced. It is possible to reduce the basic unit.

As the above-mentioned high alumina phosphate bonded plastic, for example, those shown in Table 1 are used.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for repairing a molten steel ladle wall according to an embodiment of the present invention will be described below in detail with reference to FIG. In FIG. 1, corresponding parts of the parts shown in FIGS. 2 to 4 have the same names and reference numerals.

After the slag has been removed, zircon mortar 9 is first applied to the surface of the locally melted portion formed on the molten steel ladle wall 1 by using the molten steel ladle, while the zircon mortar 9 is not dried. For example, the high alumina phosphoric acid bond plastic refractory 8 shown in Table 1 is struck.

After that, the zircon mortar 9 and the plastic refractory 8 are dried to complete the repair and receive steel. The thickness of the zircon mortar 9 is not particularly limited, but it must be applied to a thickness that increases the bonding force between the surface of the molten steel ladle wall 1 and the plastic refractory 8. It is preferably applied to a thickness of about 3 mm, most preferably about 2 mm. If it is thinner than 1 mm, the ladle wall 1
Is not preferable because the bonding force between the surface of the molten metal and the plastic refractory 8 is not sufficiently increased, and if it exceeds 3 mm, the drying time of the zircon mortar 9 is prolonged, and the surface of the molten steel ladle wall 1 and the plastic refractory 8 are It is not preferable because the binding force is rather weakened.

The components of the zircon mortar 9 are not particularly limited, and for example, those containing 56% by weight zircon and 18% by weight water are used. According to the molten steel ladle wall 1 formed by the above procedure, the plastic refractory 8 in the repaired part does not peel off even if the use of steel is repeated 8 times or more, and the durability is increased by 1.5 times or more. It was In addition, since the durability of the repaired portion is enhanced in this way, the repair frequency can be reduced and the basic unit can be greatly reduced.

[0014]

As described above, according to the present invention, zircon mortar is applied to the portion of the molten steel ladle wall that needs repair, and high-alumina phosphate bond plastic refractory is struck while the zircon mortar is undried. Therefore, the zircon mortar increases the bonding strength between the surface of the molten steel ladle wall that requires repair and the high-alumina phosphate bond plastic refractory, and the durability of the repair part can be increased.
The frequency of repairs can be reduced and the basic unit can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a repaired part structure of a molten steel ladle wall subjected to a method according to the present invention.

FIG. 2 is a construction drawing of a molten steel ladle wall.

FIG. 3 is a vertical cross-sectional view of a molten steel ladle in which a local molten damage portion is generated on the molten steel ladle wall by use.

FIG. 4 is a vertical cross-sectional view of a conventional repair structure of a molten steel ladle wall.

[Explanation of symbols]

 1 Molten Steel Ladle Wall 8 High Alumina Phosphate Bonded Plastic Refractories 9 Zircon Mortar

Claims (1)

[Claims] 1. A molten steel ladle characterized by applying zircon mortar to a portion of the molten steel ladle wall requiring repair, and hitting a high alumina phosphate bonded plastic refractory while the zircon mortar is in an undried state. How to repair the wall.