JP2920951B2 - Repair method of refractory wall in ladle - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for repairing a refractory wall in a ladle such as a hot metal ladle or a molten steel ladle, and particularly to a method most suitable for repairing a metal line on a side wall.

[Prior Art] FIG. 3 is a sectional view showing an example of a refractory wall of a ladle.
First, the permanent brick layer 14 is placed on the inner surface of the ladle 12
Is formed, and a sub-permanent brick layer 16 and a work brick layer 18 are sequentially disposed thereon. Generally, the permanent brick layer 14 is made of silica-based heat insulating brick, and the sub-permanent brick layer 16 and the work brick layer 18 are made of high alumina brick. Also sub-permanent brick layer
Magnesia carbonaceous brick (indicated by oblique lines in the figure) is used for the slag line 22 of the work brick layer 16 and the work brick layer 18.

FIG. 2 is an enlarged view of a portion of the metal line 24 on the side wall of the refractory wall. In FIG. 2, about 3/4 of the work brick layer 18 has already disappeared due to erosion and repair is required. It has become. In the conventional method, when such repair is required, even if the damaged brick has a residual thickness, all of these bricks are removed and replaced with new ones. Was. The removed non-erodible bricks were discarded or recovered and used as raw materials for the bricks.
Japanese Patent Application Laid-Open No. 54-0944
No. 06 discloses a method of forming a large number of holes in a remaining amorphous refractory and pouring the amorphous refractory into the hole to prevent the added irregular refractory from peeling off.

[Problem to be Solved by the Invention] In the above-mentioned conventional method, since the work bricks that have been damaged are totally replaced ignoring the remaining thickness of the work bricks,
There has been a problem that the used volume of the brick is large and the material cost is wasted. On the other hand, even if residual bricks are used, the erosion surface of the residual bricks has large irregularities and poor consistency with the surface of the new bricks, which may cause new problems such as joint defects. is there.

The present invention has been made in view of the problems of the related art, and has as its object to provide a new method for repairing a refractory wall by using a remaining brick as it is without removing it.

Another object of the present invention is to provide a repair method capable of reliably eliminating a structural defect due to a mismatch between a residual brick and a new brick.

[Means for Solving the Problems] In the method for repairing a refractory wall in a ladle according to the present invention, a formwork is attached to a remaining brick, and a molding space is provided between the remaining brick and the formwork. By forming a castable refractory into the molding space, an integrated refractory layer is formed on the remaining brick surface, and the surface of the refractory layer is made a flat surface. It is characterized by building a standard brick layer.

[Operation] In the method for repairing a refractory wall in a ladle according to the present invention, an integral refractory layer is formed on the remaining brick surface with the castable refractory, and the castable refractory is subjected to sufficient temperature control. The castable refractory firmly receives the movement of the heat-strained ware bricks to the rear side during use because the desired strength level is obtained by drying. Because of this, the joint defect of the brick does not develop,
A long-life refractory wall that does not cause the wear brick to fall off is obtained. Further, since the mold is used, a flat surface of the castable refractory can be obtained, and a fixed brick layer can be constructed on this surface with good consistency.

In the repair method according to the present invention having the above-described structure, the repair surface has a larger number of irregularities than the repair repair to an irregular-shaped refractory, because the repair surface is used to repair the brick surface after use. There is a joint portion, and the joint portion is worn before the surrounding refractory, so that an uneven surface is formed. In addition, the uneven erosion surfaces of the plurality of remaining bricks are once flattened by the castable refractory layer, and this flat surface becomes a base surface for constructing a new brick layer. Here, the “ladle” means a molten metal holding container including a hot metal ladle and a molten steel ladle.

The molding of the castable refractory layer by the formwork ensures a flat surface over a wide area.

Embodiment FIG. 1 is a view showing a final state in which a metal line portion on a side wall of a refractory which has been damaged shown in FIG. 2 is repaired by a method according to the present invention.

In a preferred embodiment of the repair method of the present invention, first, the second
A formwork (details not shown) is provided facing the erosion surface 32 of the remaining work brick 18 in the figure. The form has an opposing surface 34 at a position indicated by a virtual line in the figure, and forms a molding space with the remaining brick 18. The position of the facing surface 34 of the formwork correlates with the dimensions of a new brick layer 44 to be built on the castable refractory layer 42 described below. More specifically, if the thickness of the brick layer 44 is subtracted from the position of the refractory wall surface 38 planned after the repair (generally the same as the initial surface position 36 of the remaining work brick), the opposite of the formwork can be obtained. The position of the surface is determined. For example, the initial thickness A of the remaining work brick layer 18 is 150 mm, the erosion amount B is 120 mm, and the thickness C of the repair new brick layer 44 is 75 m.
m, the initial surface position 36 (38) of the remaining work brick layer 18
If the brick layer is to be repaired and formed up to
Is determined by the following equation.

A−C− (A−B) = 150 mm−75 mm−30 mm = 45 mm That is, the facing surface 34 of the form is separated from the erosion surface 32 of the remaining brick.
Place 45mm apart.

As the mold, it is desirable to use a cylindrical (or part of an arc) mold that is concentrically arranged in the ladle. This formwork may be, for example, an assembling type consisting of a plurality of parts that are divided into three arc components in the circumferential direction and are divided in heights by 2-3 bricks in the axial direction. it can. If you do this,
According to the range of the repaired part, the formwork can introduce necessary parts into the ladle and can be assembled during the ladle.

After setting the form, the castable refractory is poured into a molding space formed between the remaining brick surface 32 and the facing surface 34 of the form. The castable refractory desirably has substantially the same composition as the repair portion brick. In the case of this embodiment, the castable refractory has the same high alumina composition as the original work brick 18.
Then, after the castable refractory has solidified, the mold is removed. The layer 42 of the castable refractory after solidification has a flat surface located corresponding to the facing surface 34 of the formwork in FIG.

Finally, a new standard brick layer 44 is constructed on the castable refractory layer 42. The fixed brick is usually made of the same material as the original work brick, and in this embodiment, a high alumina brick is used. The construction method follows a general method, wherein the flat surface of the castable refractory layer 42 allows a new brick layer 44 to be closely arranged.

In the above-described embodiment, the description has been made for the metal line 24 of the ladle, but the method of the present invention is also applicable to the slag line 22 or the bottom wall 26 of the ladle.

[Effect of the Invention] According to the method for repairing a refractory wall according to the present invention, the remaining bricks can be used as a repair material as it is, so that the amount of refractory necessary for repair can be reduced. . This reduction is about 20-40% based on the normal ladle sidewall repair cycle. Moreover, since the erosion surface of the remaining brick is flattened by the castable refractory layer, the construction of the new brick is easy and reliable.

In addition, if the castable refractory layer is molded using a mold, a flat surface over a wide area can be easily and reliably obtained.

[Brief description of the drawings]

FIG. 1 is a view showing a final state in which a metal line portion of a damaged refractory sidewall is repaired by the method according to the present invention, and FIG. 2 is a metal line portion of a sidewall of the damaged refractory wall. FIG. 3 is an enlarged view, and FIG. 3 is a sectional view showing an example of a refractory wall of a ladle. 12 ... iron skin, 14 ... permanent brick layer, 16 ... sub-permanent brick layer, 18 ... work brick layer, 22 ...
Slag, 24 Metal line, 32 Fused surface, 34
Formwork facing surface, 42: Castable refractory layer, 44: New brick layer

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shoji Harada 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (56) References JP-A-54-94406 (JP, A) Japanese Patent Publication Sho55 -17086 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) B22D 41/02 F27D 1/16

Claims (1)

(57) [Claims] 1. A mold is attached to the remaining brick, a molding space is formed between the remaining brick and the mold, and a castable refractory is poured into the molding space.
Forming an integral refractory layer on the remaining brick surface, making the surface of the refractory layer a flat surface, and constructing a new standard brick layer thereon; How to repair the wall.