JPH0710238Y2 - Furnace bottom structure of molten metal container - Google Patents

Description

TECHNICAL FIELD The present invention relates to a bottom structure of a molten metal container such as an electric furnace.

Conventional technology Conventionally, the bottom of an electric furnace is stamped with a magnesia amorphous refractory, and it is generally used while the electric furnace is in operation, constantly throwing in dolomite raw materials and repairing. It was target.

Problems to be Solved by the Invention However, the cost of the repair material is high at the bottom of the furnace constructed with such an irregular shaped refractory, and the repair work takes a long time, resulting in a decrease in productivity.

Recently, it has become possible to stir molten steel by blowing an active or inactive gas from the bottom of the furnace.
In particular, damage to the bottom of the furnace has become severe.

Therefore, it is conceivable to construct a fixed refractory material with strong corrosion resistance on the bottom of the furnace, but since the bottom of the electric furnace has a spherical structure, the joints of the fixed refractory are installed via mortar for bonding. It is very difficult to do it in terms of construction technology, and molten steel easily intrudes from the joints, causing the problem that the standard refractory material floats up during use and does not achieve its purpose.

Means for Solving the Problems The present invention has been made in view of the above points, and in order to solve the above problems, a fixed refractory brick is mainly provided in the core of a molten metal container such as an electric furnace. A plurality of annular bottom and concentric circularly arranged bottoms, the front end face and rear end face of the fixed-shape brick in the radial direction are concavely formed, and the front end of the fixed-shape brick is formed. The position of the recess on the surface side is formed lower than the position of the recess on the rear end surface side, and the irregular shaped refractory is joined to the periphery of the fixed refractory bricks arranged side by side in the above annular shape. The present invention provides a furnace bottom structure for a molten metal container.

Effects According to the present invention, the corrosion resistance of the hearth can be improved by arranging the regular shaped refractory bricks in a circular shape around the core part in multiple layers side by side in the furnace bottom part. And, while forming a part of the front end face and the rear end face of the fixed-form fire brick in the radial direction, the position of the recess on the front end face side of the fixed form refractory brick is lower than the position of the recess on the rear end face side. By forming and arranging the irregular shaped refractory joined to the peripheral portion of the fixed shaped refractory bricks arranged side by side in the annular shape, it is possible to reliably prevent the molten metal from entering the joint portion of the fixed shaped refractory brick, In addition, it is possible to fill and join the irregular refractory in the front and rear recesses of the standard refractory brick, and even if the furnace bottom surface is made spherical, it is possible to prevent mutual lifting of the regular refractory bricks and use it safely. it can.

Embodiment Hereinafter, the present invention will be described based on an embodiment. Fig. 1 ~
FIG. 4 shows an embodiment of the present invention. The furnace bottom portion 2 of the molten metal container 1 of the electric furnace has an arc-shaped cross section as shown in FIG. 1, and permanent bricks 4 are laminated in several stages along the iron shell 3 of the spherical bottom wall. An irregular refractory 5 is applied to the inner lining of the refractory 5 and regular refractory bricks 6 are arranged in a circular shape and in multiple layers around the core, as shown in FIGS. 1 and 2.

The standard refractory brick 6 is 200 to 300 as shown in Figs.
With a height of mm, the rear end is 80 to 100 mm, the front end is a tapered MgO-C brick of 50 to 80 mm, and there is a recess 7 at the lower part of the front end face as shown in the figure. The recesses 8 are respectively provided at the positions of the upper portion of the rear end surface higher than the front portion. Then, as shown in FIGS. 1 and 2, a cylindrical MgO-C refractory brick 10 provided with an annular groove 9 in the core was installed, and an amorphous refractory material 11 having a width of 20 to 60 mm was provided around the refractory brick 10.
The refractory bricks 6 with the above-mentioned taper are arranged radially as shown in FIG.

The tapered fixed refractory brick 6 has a concave portion 7 of the fixed refractory brick 6 arranged in a ring shape by adhering and bonding an irregular refractory material (not shown) in a mortar shape of about 1 mm to 2 mm on the side surface. In the same manner as above, the irregular refractory material 11 having a width of 20 to 60 mm is loaded in the peripheral portion having the shape and 8, and the fixed refractory bricks 6 are annularly joined as shown in the figure over several layers (three layers in the figure) are doing.

When the irregular refractory material 11 is loaded between the regular refractory bricks 6, the pressure is applied with an air rammer or the like. It is preferable to perform this construction sequentially from the core side toward the outer peripheral side. When the outer peripheral side of the fixed refractory brick 6 is strongly pressed with an air rammer or the like, the tapered fixed refractory brick 6 arranged in an annular shape is moved toward the core part. Moved and tightened between the outer surface and side end surface of the fixed refractory brick 6 to prevent the fixed refractory brick 6 and the irregular refractory 11 from sticking together and preventing molten metal from entering through the joints. is there.

FIG. 5 shows that the above-mentioned standard refractory brick 6 is installed in a staircase shape along the furnace bottom 2.

As described above, the standard refractory bricks are arranged in an annular shape, and the irregular shape refractory is placed on the inner and outer peripheral sides of the annular shaped refractory brick, so the furnace bottom is spherical as shown in the figure. However, the refractory material can be easily installed along the bottom of the furnace by gradually raising the annular shaped refractory brick in a stepwise manner toward the outside.

Further, since the recess 7 is provided at the lower side position on the narrow side and the recess 8 is provided at the upper side position on the wide side on the end surface of the fixed refractory brick 6, the fixed refractory brick 6 is constructed stepwise. However, the irregular shaped refractory can be reliably and easily loaded into the recesses 7 and 8 of the end faces of the regular shaped refractory bricks on the inner and outer peripheries, and they can be joined in multiple layers.

In this way, by arranging multiple fixed-shape refractory bricks with excellent corrosion resistance side by side in an annular shape on the bottom of a severely damaged furnace, and by interposing an irregular-shaped refractory that is easy to install between the fixed-shape refractory bricks, Even if the bottom of the furnace is spherical and difficult to construct, it is possible to easily construct a fixed-size brick, and it is possible to reliably prevent molten metal from entering through joints and improve the durability of the bottom of the furnace. .

In addition, during repair, the fixed refractory bricks can be easily replaced by tearing down the irregular shaped refractory around the circumference of the annular shaped refractory bricks, especially the fixed shape of the central part of the bottom of the furnace, which is the most severely damaged. This is preferable because it allows easy repair of refractory bricks.

The taper amount of the regular refractory brick can be set to an appropriate value corresponding to each annular diameter to be constructed.

In particular, the recess provided on the end face of the standard refractory brick can reliably prevent the intrusion of molten metal from the joint part, and at the same time, a recess is provided in the lower part of the end face on the narrow side of the standard refractory brick.
Since a recess is provided in the upper part of the end face on the wide side and irregular shaped refractory is installed through these recesses, it is easy to construct even stepwise and even if it is constructed stepwise, the fixed refractory brick rises. Can be effectively prevented.

As described above, according to the present invention, even if a fixed refractory brick is joined to the bottom of a molten metal container such as a converter in an annular shape in multiple layers, an irregular shaped refractory can be formed before and after the fixed refractory brick. Since the recesses can be loaded and joined, the molten metal can be reliably prevented from entering through the joints, and the durability of the furnace bottom can be improved.

And since the position of the recess on the front end face side of the standard refractory brick is formed lower than the position of the recess on the rear end face side, even if the furnace bottom is constructed stepwise, it is easy to construct and the electrical resistance is high. It is possible to effectively prevent floating of the fixed-form refractory brick during use of a molten metal container such as a furnace, and it can be used safely.

[Brief description of drawings]

1 and 2 are a side sectional view of a molten metal container of an electric furnace according to an embodiment of the present invention with a part thereof omitted, and a plan view of the bottom of the furnace.
Figures and 4 are a plan view and a side view of the above-mentioned standard refractory brick.
FIG. 5 is a side sectional view of another example of use of the same. 1 ... Molten metal container, 2 ... Furnace bottom, 6 ... Regular refractory brick, 7, 8 ... Recess, 11 ... Irregular refractory.

Claims (1)

[Scope of utility model registration request] Claims: 1. A furnace bottom structure in which fixed refractory bricks are annularly arranged around the core and multiple concentric circles are arranged in the furnace bottom of a molten metal container such as an electric furnace. A part of the front end face and the rear end face of the standard refractory brick is recessed, and the position of the recess on the front end face side of the standard refractory brick is formed lower than the position of the recess on the rear end face side. A furnace bottom structure for a molten metal container, characterized in that irregular shaped refractory materials are joined to the peripheral portions of the fixed shaped refractory bricks arranged side by side.