JPH0336884B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a brick casting method for a stave cooler used for cooling the walls of a blast furnace.

(Prior Art) Conventionally, when bricks were cast into a stave cooler, cracks occurred in the bricks. In order to eliminate this rift,
When bricks were cast, heat insulating cushioning material was pasted on both sides of the bricks (Special public relations number 1982-8241,
(Technology described in Public Relations Publication No. 52-31811). This method has been adopted as a countermeasure against the problem that when solid bricks are cast with molten iron at temperatures around 1300℃, cracks occur on the inner and outer surfaces of the bricks, making them unstable as stave bricks. The role of this insulating cushioning material is to alleviate thermal shock and to avoid shrinkage cracks in the main body of the stave cooler, and rock wool or the like is used as the material.

(Problems to be Solved by the Invention) However, in the above method, not only is the cost of the rock wool high, but also the work efficiency is poor because the rock wool is manufactured by pasting it on the bricks. Furthermore, the material of the stave is different around the bricks, which can be a factor that hinders achieving efficient temperature distribution (heat conduction through the bricks).

Further, when manufacturing a stave cooler by pasting rock wool, the thickness of the rock wool after casting becomes less than half of the original thickness. For this reason, a gap is created between the refractory bricks and the rock wool, resulting in a structure in which the refractory bricks are inserted loosely. Therefore, there was a risk that the refractory bricks would be pulled out due to vibrations, etc., and the pulled-out portions were sometimes chipped.

(Means for Solving the Problems) The present invention has been made for the purpose of solving the disadvantages of this prior art. In the brick casting method for a stave cooler having a refractory brick on the side, the side surface of the refractory brick that is in contact with the casting to be cast is covered with a metal plate formed by folding once or several times, and then the brick is cast. In addition, there is a brick casting method for a stave cooler in which the metallic plate material 2 is formed by folding another metal plate material so as to sandwich one or more of the metal plate materials, and the folded metal plate material is used for casting.

(Function) Since the side of the refractory brick is covered with a metal plate formed by folding the other side once or several times before casting, the heat input at the initial stage of pouring is controlled at a certain rate to make it fireproof. The heat is transmitted to the bricks, and the bricks are preheated. Therefore, it acts to alleviate the thermal shock at the initial stage of pouring. At this time, since the metal plate material has a structure that is folded once or several times, the heat input at the initial stage of pouring is conducted by the air space between the metal plate materials, and the conduction thereof is relaxed, so that thermal shock can be alleviated.

In addition, since the metal plate material is deformable, it can be expected to absorb the shrinkage force during contraction, and since there are no foreign substances between the base material and the brick, appropriate heat conduction can be expected.

(Example) The present invention will be explained in detail below using one example.

A plurality of trapezoidal refractory bricks 1 with the working surface side of the stave cooler slightly shortened are arranged in one row (four in this embodiment) and are placed in several rows in parallel (three rows in this embodiment). After applying the metal plate material 2 to both sides, a plurality of C-shaped bands 3 made of the same material as the metal plate material 2 are attached to the firebrick 1, so that the metal plate material 2 is pressed against the side surface of the firebrick 1. It is provided so as to sandwich the metal plate material 2.

Note that the metal plate material 2 is made of a plurality of metal plate materials made of the same metal as the molten metal to be poured, and in this embodiment, other metal plate materials are folded so as to sandwich one plate material, and the edges By welding and forming the parts, some air space is created between the metal plates (see Fig. 4).

When pouring metal in this state, the heat retained in the poured molten metal is conducted to the refractory brick 1 via the metal plate 2. On the other hand, most of the C-shaped band 3 used to press the metal plate material 2 against the refractory brick 1 melts due to the heat held by the molten metal during pouring, or because it is made of the same metal as the molten metal, it melts. This does not affect the shrinkage force of the molten metal since the metal becomes one with the molten metal during cooling. Further, when the molten metal contracts, since the molten metal and the refractory brick 1 are separated by the metal plate 2, the metal plate 2 acts as a buffer and absorbs the contraction force.

Furthermore, since no foreign matter exists between the cast parts 4 of the finished product, the stave cooler, and the refractory brick 1, a stable structure is ensured, and efficient brick heat conduction can be expected when the stave cooler is used.
5 in the figure is asbestos installed between firebrick 1.
6 is a gap filler for removing gaps that occur when the metal plate material 2 is attached to the firebrick 1.

(Effect of the invention) Since the present invention operates as described above,
The heat input at the initial stage of pouring during casting is transmitted to the refractory bricks at a certain rate, the bricks are preheated, and the thermal shock at the initial stage of pouring is alleviated by the metal plate and the voids within the metal plate. Can be done. In addition, the metal plate material is deformable and can absorb the contraction force during contraction, and since there are no foreign substances between the base material and the bricks, appropriate heat conduction and stability can be expected.

Furthermore, the procedure for brick casting is simple, and the materials used can be obtained at low cost, resulting in significant cost reductions and other excellent effects.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a bottom view of a stave cooler manufactured according to the present invention, FIG. 2 is a sectional view taken along line A-A of the same, and FIG. Sectional view of installed state, 4th
The figure is an enlarged sectional view showing an example of a metal plate material. 1 is a refractory brick, 2 is a metal plate, 3 is a C-shaped band, 4 is a casting, 5 is asbestos, and 6 is a gap filler.

Claims (1)

[Scope of Claims] 1. In a brick casting method for a stave cooler that has a cooling pipe for cooling the furnace wall of a blast furnace, etc., and has a refractory brick on the working surface side, a refractory brick that is in contact with the casting to be cast. A method for casting bricks for a stave cooler, characterized in that the side surfaces of the stave cooler are covered with a metal plate formed by folding once or several times, and then cast. 2. A brick casting method for a stave cooler according to claim 1, characterized in that a metal plate formed by folding another metal plate is used to sandwich one or several plates.