JPS5910868B2 - Ladle lining construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing a lining for a ladle that receives tapped metal from a steel-making furnace and supplies molten steel to an ingot-making mold.

The inner lining of this type of ladle for receiving steel should be resistant to melting, such as the hot water contact area and the side wall on the side of the gas injection plug, which are severely damaged during receiving steel or by boiling of molten steel during degassing operations. By using two different types of ladle bricks, for example, use bricks made of magnesia or carbon, which have excellent properties, and use bricks made of alumina or zircon in other areas adjacent to the above-mentioned areas. will be built.

However, this construction method has the disadvantage that large abnormal erosion occurs at the joints of bricks made of different materials, which can lead to joint breakage.

An object of the present invention is to provide a ladle lining construction method that can eliminate the above-mentioned drawbacks, and the method of the present invention will be detailed as follows.

The present invention is also the same as the conventional method described above in that the materials of the bricks used are different for the areas where the melting damage caused by molten steel is particularly severe and the remaining areas other than the areas.

However, the present invention is characterized by the use of unfired bricks integrally molded from the different materials as two layers of left and right layers at the locations where bricks of different materials are joined.

An example of an unfired brick, which is a two-layer integrally molded product made of different materials, used in the present invention is shown in FIG.

In the figure, whether diagonal lines are added or not indicates that they are made of different materials.

Normally, in addition to the above-mentioned magnesia and carbon materials, materials with excellent erosion resistance such as magnesia materials are used for hot water contact parts, etc.
In addition to alumina and zircon, materials such as mullite and corangum are used for other parts, and the materials of the shaded area 1 and the non-shaded area 2 are bonded to each other. As long as the brick is made of the same material,
It doesn't matter what the combination is.

Its shape and dimensions may be any shape and dimensions that are compatible with the ladle lining to be constructed.

Regarding the joint surface 3 of both the left and right parts 1 and 2, as can be seen from the wavy lines shown on each end surface, it is preferable to use a surface with unevenness that matches each other rather than a flat surface. .

FIG. 2 shows a part of a developed view of the lining surface constructed according to the present invention using such unfired bricks.

From the same figure, by placing the above-mentioned unfired brick C between the ladle brick A with diagonal lines and the ladle brick B without diagonal lines, the joint surface 3 of the unfired brick C has no joints. It is clear that the joint length of the different types of bricks is much smaller than that of the case where the two types of bricks A and B are used.

Therefore, according to the method of the present invention, the melting damage at the joints of dissimilar materials can be significantly improved, contributing to the extension of the flame-resistant life of the ladle. It is extremely easy to work with.

Examples are shown below.

In a 60-ton ladle, when the ladle bricks A and B were made of magnesia carbon and alumina zircon, respectively, the joint melting loss of the different materials was about 40 tones after being tested 50 times.

However, at the point where bricks A and B made of different materials are joined, an unfired brick C, in which one part 1 is made of magnesia carbon and the other part 2 is made of alumina zircon, is used, as shown in Fig. 2. When constructed as shown, we were able to significantly reduce the erosion of joints between different types of materials by about 10 cm.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a single unfired brick used in the method of the present invention, and Fig. 2 shows a part of a developed view of the lining surface made using the unfired brick shown in Fig. 1. . A, B... Ladle bricks made of different materials, C... Unfired bricks that are two-layer integrally molded products made of different materials, 3... Parts 1 and 2 joint surface.

Claims (1)

[Claims] 1. In the lining of a ladle in which the materials of the bricks used are different between the part that is severely damaged by molten steel and the rest of the part, the parts where the bricks of different materials join are:
A ladle lining construction method characterized by using unfired bricks integrally molded from the different materials as materials for the left and right two layers.