JPS5910867B2 - metallurgy container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a metallurgical vessel such as a pot or tundish or a smelting furnace having a brick holding mechanism.

Currently, as a method to prevent bricks from falling when the pot is tilted and to prevent tier joints from opening, it is common to install a brick retainer (receiver) on the top tier as shown in Figure 1. This is an easy method.

However, this method has the drawback that the brick clamping hardware may be deformed and melted due to the scattering of molten steel during steel receiving in a converter or electric furnace, or may be melted due to thermal deformation due to special operations (LF, etc.).

As a method to compensate for this drawback, a method is generally adopted in which the brick-pressed refractory is covered with a monolithic refractory (FIGS. 2 and 3).

However, this method poses a problem with the coating thickness a of the person-resistant material, and if the coating thickness is thin, the coating effectiveness will be lost earlier due to peeling phenomenon during use.

Further, in the method shown in FIG. 2 in which the coating thickness a is increased, the effective volume (the ratio of the volume that can actually contain molten steel) to the pan volume, ie, h2/h, becomes low.

Furthermore, the method shown in FIG. 3 has the disadvantage that the effective volume h2 is further reduced (naturally, h2/h1 is also smaller), resulting in lower productivity.

The present invention was created in consideration of the current situation, and its purpose is to prevent bricks from falling as much as possible when the pot is tilted while ensuring a sufficient effective volume for the pot and kundish volume. It is intended to provide a metallurgical vessel structure.

The present invention provides a metallurgical vessel in which the outer surface of the uppermost wear brick is inclined toward the inner side of the furnace, and a monolithic refractory structure is provided between the upper end of the iron shell and the permanent lining. The present invention relates to a metallurgical container characterized in that a space surrounded by an inclined surface of the uppermost brick is filled with a monolithic refractory.

The metallurgical container according to the present invention will be specifically described below with reference to an embodiment shown in FIGS. 4 to 8.

The overall structure of the metallurgical container according to the present invention is shown in FIGS. 4 and 5, in which 1 is an iron shell, 2 is a general permanent wall brick (clay brick is considered as the refractory material),
3 is a permanent brick for slag line (fired magnesia brick is considered as a refractory material), 4a to 41 are wear bricks, and especially 4g, 4h, and 4i are slag line wear bricks (dolomite brick is considered as a refractory material) (conceivable).

The other wear bricks 4a to 4f may be high alumina unfired bricks.

Further, 5 is a hearth brick (zircon brick is considered as the refractory material).

In the above brick configuration, generally wear bricks 4a to 4f
For every 40 charges, 4g of Slag Line Wear Bricks
41 is replaced every 20 charges, and the bottom brick 5 is replaced every 20 charges in this embodiment.

The brick holding mechanism that forms the gist of the present invention is shown in detail in FIGS. 6 to 8, and as shown in the figures, the uppermost slag line wear brick 41 has its outer peripheral surface facing upward and toward the inside of the furnace. An inclined tapered surface b is formed.

On the other hand, a monolithic refractory 6 (high alumina caster pull can be considered as the refractory material) is installed between the slag line wear 41 and the steel skin 1, and the castable 6 as a molded body is in close contact with the tapered surface b. The slug line wear bricks 4a to 41 can be completely prevented from moving in the axial direction by the engagement of both tapered surfaces.

In this embodiment, the monolithic refractory 6 is replaced every 200 to 300 charges.

In addition, refractory mounting reinforcing pieces 7 are installed at a position slightly below the upper end of the steel shell 1 and at a required circumferential pitch (required spacing for a horizontally long box-shaped container such as a tundish).
By extending the reinforcing piece into the monolithic refractory 6, the monolithic refractory is firmly attached to the steel shell 1.

Reference numeral 8 denotes a brick covering part extending in the direction of the furnace at the upper end of the monolithic refractory 6, and if this part is separated from the trench 11, it can be easily supplemented.

Other embodiments of the brick holding mechanism or locking structure are shown in FIGS. 9 to 12, and in FIG. 6, and FIG. 10 shows the anchor bolt with the base end of a refractory reinforcing piece 7 fixed to the inner wall of the steel shell 1, and FIG. 11 and FIG. In this case, instead of the refractory attachment piece 7 described above, the upper surface of the slagline permanent brick 3 is made into a dovetail shape, and then the monolithic refractory 6 is filled.

In addition, the monolithic refractory 6 forms a void 9 at the lower end of the tapered surface b of the uppermost slag line wear brick 41, and when constructing the wear brick or slag line wear brick using the same void h2, that is, the slag line brick 4h. Or, even if 41 varies by ±10wn, the brick 41 moves in the axial direction and in the direction of the inside and outside of the furnace (perpendicular to the axis) to keep the tapered surfaces b and c in constant contact, and the slag lineware brick 41 can be adjusted to 4h. Bricks 4h can be pressed down if they are in close contact.

Note that the void 9 is not necessarily limited to the above configuration (FIGS. 8 to 12), and may be formed between the monolithic refractory 6 and the top wear brick 41 as shown in FIG. 13, for example. Alternatively, it can also be formed between the monolithic refractory 6 and the slagline permanent bricks 3 as shown in FIG.

In this example, the voids are initially made of foamed polystyrene, cardboard, or the like in the shape of the voids, and are then dissipated by the heat of the furnace during use.

As described above, the metallurgical container according to the present invention can reliably prevent bricks from falling or the joints between the bricks from expanding due to the unique brick fall prevention mechanism, and can also maintain the effective volume to the maximum relative to the volume of the metallurgical container. Can be done.

Further, the brick fall prevention mechanism described above can be applied either to a part of the metallurgical container or to the entire circumference.

[Brief explanation of drawings]

1 to 3 are cross-sectional explanatory views of a metallurgical container equipped with a conventional brick holding mechanism, FIG. 4 is a cross-sectional front view of a metallurgical container according to the present invention, and FIG. 5 is a line taken along the line I-I in FIG. FIGS. 6 to 14 are enlarged explanatory views of main parts.

Claims (1)

[Claims] 1 In a metallurgical vessel, the outer surface of the furnace outer surface of the uppermost wear brick is formed to be inclined toward the inner side of the furnace, and there is a monolithic refractory locking structure between the upper end of the iron skin and the permanent lining, and the iron skin and the above-mentioned A metallurgical container characterized in that a space surrounded by an inclined surface of the topmost brick is filled with a monolithic refractory.