JPH0636473Y2 - 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.

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

Recently, molten steel has been agitated by blowing active or inert gas from the bottom of the furnace, and damage to the bottom of the furnace has become particularly 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 formed around the core of a molten metal container such as an electric furnace. Around the above-mentioned standard refractory bricks, which are arranged in multiple annular shapes and concentrically, and in which the front end surface and the rear end surface of the standard refractory brick in the radial direction are recessed and are arranged side by side in an annular shape. (EN) A furnace bottom structure of a molten metal container, characterized in that an irregular refractory material is bonded to each of the above and disposed.

Effects According to the present invention, the corrosion resistance of the hearth can be improved by arranging the fixed-form refractory bricks in a circular shape around the core part in multiple layers side by side at the bottom part of the hearth. Also, by arranging the end face that corresponds to the radial direction of the standard refractory bricks and joining them with an irregular refractory, molten metal does not easily penetrate into the joints of the regular refractory bricks and the mutual rise of the regular refractory bricks is prevented. Preventable and safe to use.

Embodiment Hereinafter, the present invention will be described based on an embodiment.

1 to 4 show 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 side by side in an annular 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 and the front end is a tapered MgO-C brick with 50 to 80 mm, and a recess 7 is formed in the lower part of the end face on the narrow side as shown in the figure. Recesses 8 are provided in the upper part of the end face on the side. 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 20 to 60 m around it.
An irregular refractory material 11 is loaded into the m width and the above-mentioned tapered regular refractory bricks 6 are radially arranged as shown in the figure.
The fixed refractory brick 6 with a taper has an unfixed refractory material (not shown) on the side surface in the radial direction with respect to the core of 1 mm to 2 mm.
mm-shaped mortar is attached and joined, and an irregular shaped refractory material 11 having a width of 20 to 60 mm is loaded in the same manner as above on the peripheral portion having the concave portions 7 and 8 of the shaped refractory brick 6 arranged in an annular shape. As shown in the figure, fixed refractory bricks 6 are joined in an annular shape over several layers (three layers in the figure).

When the irregular refractory material 11 is loaded between the regular refractory bricks 6, the pressure is applied by 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 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.

In addition, since the end of the standard refractory brick has a recess on the lower side on the narrow side and the recess on the upper side on the wide side, even if the standard refractory brick is installed in a stepwise manner, the end faces of the standard refractory bricks on the inner and outer peripheries Irregular shaped refractory can be surely loaded in the recessed part of and can be joined over several layers.

Thus, by arranging multiple fixed-shape refractory bricks with excellent corrosion resistance side by side in a ring 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 furnace bottom is difficult to construct,
A standard refractory brick can be easily installed, molten metal can be prevented from entering through joints, and the durability of the furnace bottom can be improved.

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,
Since the irregular shaped refractory is installed through the recess, it is possible to reliably prevent the shaped refractory brick from rising while the electric furnace is in use, and the shaped refractory brick is provided by forming a recess under the end face of the shaped refractory brick. Can be effectively prevented from rising.

Other Embodiments FIG. 6 shows another embodiment of the present invention.

In this embodiment, as described above, the fixed-form refractory bricks 6 are multiply arranged in an annular shape and in a stepwise manner, and a gas blowing plug 12 such as a through-hole type plug is attached to the central portion thereof.

The same applies to a molten metal container in which an inert gas such as N ₂ or Ar gas or an active gas such as O ₂ or CO _{2 is} blown from a gas injection plug to agitate the molten metal as in this embodiment. In addition, when the gas blowing plug is melted and broken, it is possible to easily replace the gas blowing plug by breaking down the amorphous refractory around the gas blowing plug.

Although the electric furnace has been described above, it can be similarly applied to a converter having a spherical bottom and other molten metal containers.

Effects of the Invention As described above, according to the present invention, the durability of the furnace bottom is improved, molten metal can be reliably prevented from entering through the joints of the regular refractory bricks, and the mutual mutual resistance of the regular refractory bricks is improved. It can be lifted up and can be used safely.

Further, in repairing, by breaking the irregular shaped refractory material on the outer peripheral portion of the annular shaped refractory brick, the fixed shaped refractory brick on the inner peripheral portion can be easily replaced.

[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 usage example of the above, and FIG. 6 is a side sectional view of another embodiment of the same. 1 ... Molten metal container, 2 ... Furnace bottom, 6 ... Standard refractory brick,
7, 8 ... Recesses, 11 ... Unshaped refractories.

Claims (1)

[Scope of utility model registration request] 1. A front end of a standard refractory brick in the form of a circular shape, concentrically arranged around the core of a molten metal container of a molten metal container such as an electric furnace, and concentrically. Bottom structure of a molten metal container, characterized in that irregular shaped refractories are joined to the peripheral portions of the above-mentioned shaped refractory bricks, in which a part of the surface and the rear end face are recessed and arranged side by side in an annular shape. .