JPH0336885B2 - - 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) When bricks were conventionally 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 Japanese Patent 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 an impediment to achieving efficient temperature distribution (heat conduction through the bricks).

Furthermore, when using a stave cooler manufactured by pasting and casting rock wool, the thickness of the rock wool becomes less than half that of the original thickness during use. 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 refractory bricks on the side, the refractory brick 1 is placed inside the metal box body 2.
This is a method in which it is placed in a container and then cast.

(Function) Since the refractory bricks are covered with metal box material and then cast,
The heat input at the initial stage of pouring is transferred to the refractory bricks at a certain rate, and the bricks are preheated. Therefore, it acts to alleviate the thermal shock at the initial stage of pouring. Furthermore, since the metal box body 2 and the refractory brick 1 are in surface contact and are not welded together, the contraction force generated when the molten metal cools can be absorbed by the metal box body 2 itself, and the refractory brick 1 Since unnecessary stress is not applied and there are no foreign substances between the base material and the bricks, appropriate heat conduction can be expected, making it possible to extend the life of the stave cooler.

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

A row consists of a plurality of trapezoidal refractory bricks 1 with the working surface side of the stave cooler (the surface not in contact with the stave cooler casting) slightly shortened (in this example, four
) are placed in several rows in parallel (in this example, 3
(column), the surface of the refractory brick 1 in contact with the casting is surrounded by a metal box 2 made of the same metal as the molten metal to be poured, and if molten metal is poured in this state, the molten metal will not be poured. The heat retained in the molten metal is conducted to the refractory brick 1 via the metal box 2 and cooled. In the finished casting, the boundary line between the metal box 2 and the poured molten metal is no longer clear because the portion of the metal box 2 on the molten metal side is melted. Therefore, although it is a method of manufacturing a stave cooler in which refractory bricks 1 are cast from the beginning,
No unnecessary stress is applied to the refractory brick 1, and the same durability can be given to the refractory brick 1 by charging the refractory brick 1 after casting. Furthermore, since the metal box 2 is used from the beginning and the gap between it and the refractory bricks 1 is only slightly displaced, the refractory bricks 1 will not fall off, unlike the case where rock wool is pasted and cast. Also in this respect, it is superior to the manufacturing method in which the refractory bricks 1 are charged after casting. That is, when charging the refractory brick 1 after casting, the refractory brick 1 cannot be charged unless the charging side (working surface side) is at least large. On the other hand, in the method according to the present invention, since the refractory brick 1 can be cast in a trapezoid shape with the working surface side slightly shortened from the beginning, it is possible to completely prevent the refractory brick 1 from falling off during use.

Furthermore, the metal box body 2 is integrated with the casting 3 part of the finished product, the stave cooler, and since there are no foreign substances between the casting 3 and the refractory brick 1, it is possible to It can be expected to have good heat conduction.

The thickness of the metal box 2 is not particularly limited, but it must be thick enough to moderate the thermal shock of the molten metal being poured. Therefore, the side plates and the like used in the metal box 2 may be a single plate or a plurality of stacked plates.

Incidentally, the refractory brick 1 used in the present invention is not limited to that of the above-mentioned embodiment, but may be a refractory brick halved as shown in FIG. 3.

4 in the figure is asbestos installed between the firebricks 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 can be alleviated. In addition, since the metal box and the refractory bricks are in surface contact and not welded,
The contraction force generated when the molten metal cools can be absorbed by the metal box body 2 itself, and unnecessary stress is not applied to the refractory brick 1, thereby preventing the occurrence of cracks in the refractory brick. . Furthermore, since there are no foreign substances between the base material and the bricks, proper heat conduction can be expected, and the brick casting procedure is simple.
The materials used can be obtained at low cost, resulting in significant cost reductions and other excellent effects.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; 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. FIG. 1 is firebrick, 2 is metal box, 3 is cast iron,
4 is asbestos.

Claims (1)

[Claims] 1. In the brick casting method for a stave cooler that has a cooling pipe for cooling the furnace wall of a blast furnace, etc., and has refractory bricks on the working surface side, the refractory bricks are placed in a metal box and then cast. A method of brick casting for stave coolers, which is characterized by the fact that