JPS58203386A - Method of repairing damaged section of refractory - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for repairing damaged parts of lined refractories such as converters or ladles by spraying, and provides an improved repair method that can be repaired thickly and firmly without peeling. The purpose is to

When hot repairing the damaged part C of the refractory lining of a converter (hereinafter simply referred to as the damaged part), generally after tapping, about 10 to 10% of water by weight is removed by a dry method or a wet method. Added. Spraying materials such as dolomite or magnesia are sprayed to a thickness of 30 to 5 degrees, but 4 to 5 degrees thick.
After using 5 charges (blowing), it became thinner and most of it fell off from the damaged area, so it was necessary to repair it again and again.

By the way, as a technique that can be applied to solve such a problem, there is a technique described in Japanese Patent Application Laid-open No.
Diamond-shaped metal anchor (external dimension, 2j1 or less) 0.1
There is a "hot repair method for converter bricks" in which spraying material containing 1% by weight is sprayed onto the damaged area using a dry method, and an anchor is pushed into the slag layer to form an adhesive layer. It is easy to get clogged inside, and if sprayed too thick, it may flake off, so it cannot be applied to deeply damaged areas, and the anchor cannot penetrate damaged areas where there is no slag layer, so this repair method cannot be implemented. . In addition, as described in Japanese Patent Application Laid-Open No. 11-203174, a small hole is pre-drilled diagonally in the wall surface of the damaged area, and the hole is filled with approximately T.
There is a ``method for repairing refractory linings of metallurgical furnaces and containers'' in which a letter-shaped or X-shaped reinforcing bar (stud) is driven in and fixed, a wire is stretched over it, and then a monolithic refractory is attached. Since it is necessary to make a large number of small holes in the damaged area, there are problems such as it is time-consuming and cannot be carried out at temperatures of 300° C. or higher.

In order to solve these problems, the inventors of the present invention have conducted various studies and found that the main method is to use a combination of a rather short rod-shaped anchor and a spray material.

In particular, we discovered that the spray material can be sprayed more easily and thicker than before in hot conditions, and it does not flake off.

The repair method of the present invention has been completed.

That is, the gist of the present invention is to first form a base layer of an appropriate thickness on the damaged area to be repaired using a conventional method, and then apply the base layer using a well-known firing device.

The point is that a short rod-shaped anchor is fired and pierced, and then an adhesion layer is applied on top of it by a similar spraying method,
Even vertically damaged parts can be repaired thickly and firmly by spraying, and the durability of the repaired part is significantly improved. 1:... The following is based on the drawings showing one embodiment of the present invention.

The repair method of the present invention will be explained in detail.

In the repair method of the present invention, as shown in FIG. 7, first, as a preliminary preparation, the inner surface of the damaged part l is sprayed to a thickness of 30 mm by a well-known spraying method. The purpose is to form a base layer 2 of θ■.

The spraying material used for this purpose may be well-known materials such as dolomite, magnesia, or high alumina, but if possible, a small amount of slag powder or low stone powder may be added to improve adhesion and fusion to the damaged area. It is better to have a higher In addition, as a means of forming the base layer, either the well-known dry method or wet method may be used, but if the thickness is generally less than 30 W+, the anchor 3 cannot be firmly fixed.
When it reaches this point, before launching anchor 3 and sticking it out,
Cracks often occur in the base layer itself, causing it to fall off.
The above range is preferable.

Next, while the base layer 2 is still a little soft.

From the well-known launcher≠, generally a short rod-shaped anchor 3
After firing and stabbing at new intervals, the base layer 2 is further hardened and fixed.

The launcher used for this purpose consists of a heat-resistant conduit (e.g., stainless steel pipe) with a straight or gently curved tip, and a narrow box-shaped storage part 6 and a small solenoid valve at the slightly rear part. 7 is installed behind it, and further,
A scissor-shaped device with an air hose connected to the rear end is common, but instead of air, a device with a built-in strong spring or a type that is loaded with gunpowder or the like may also be used.

Furthermore, the anchor 3 is as shown in FIG.

Made of metal c copper, stainless steel) or ceramics, the diameter or side is j'``''' 72 m11+, and the length is 7! A round or square rod with an acute angle at the tip of θ ~ 00■ is generally used, but in order to blend well with the spray material, the side surface of the rod is sharpened as shown in Figure 2 (b). Small grooves may be provided at appropriate intervals perpendicular to the axial direction. In addition, if the diameter is less than jtl1, in the case of ceramics, the mechanical strength may be insufficient and it may break.
If it is made of metal, it is easily oxidized and worn out, and if it exceeds /2■, a large firing device will be required, so the above range is preferable. In addition, the length is determined according to the depth of the damaged part l to be repaired, that is, the repair thickness, but /10
If it is less than -200, it is too short and the effect of this repair method cannot be fully demonstrated, and if it is more than -200, the repaired part io is
If the thickness becomes too thick, the surface layer may peel off, so the above range is preferable.

Then, as shown in FIG.
After charging the furnace into the furnace so that the temperature is about /vn, the solenoid valve 7 is operated periodically, and instantaneously! Let a certain amount of air flow in.

Then, the anchors 3 are fired one by one at a speed of SO ~ 70 m/sec, and the anchors are pierced horizontally into the base layer, which has not yet completely hardened, at intervals about the same as the length of the anchors. Therefore, the base layer λ is heated for the wave number minutes using furnace heat or a separately provided small burner (not shown) to completely harden and bake the base layer λ. Furthermore, its firing speed is! Om
If the speed is less than /second, the speed is insufficient, and if the timing of firing is lost even slightly, the tip of the anchor 3 will not be able to pierce deeply into the base layer λ until it reaches the inner surface of the damaged part l,
If the speed exceeds 70 m/sec, the force will be too strong and the anchor 3 may become slanted or even bounce off, so the above range is preferable.

Also, when you want to repair the adhesion layer // (indicated by a phantom line) more firmly by eliminating peeling, which will be described later.

As shown in Fig. 2(c), an operator uses a Y-shaped anchor 3 with a locking part 12 at the rear end, and a small hook 13 at the tip, and attaches it to another support. Added 1
It is best to hook it on a strong coil spring, use its elasticity to fire, and stick it in the same way.

Then, after removing the firing device I/- at the top, a spraying vibrator (not shown) was similarly inserted, and a well-known spraying material with as high corrosion resistance as possible was applied.

is on the strongly hardened or sintered base 1i2.
.

It is sufficient to spray to a thickness of ~2θOm by completely burying the anchor -3 to form an adhesion layer 11.

In addition, if necessary, if necessary, wrap paper tape around the rear of the anchor 3, or use an anchor 3 coated with a thin layer of blown asphalt in advance, to ensure that the vertical and horizontal expansion of the adhesion layer is moderate when restarting the operation. Since it is absorbed and no cracks occur, it is even more effective in preventing flaking.

When the damaged part l is repaired in this way, the anchor 3 has its tip end 30''-
'101wIt is stuck firmly to the depth and does not tilt downward even when a 10kg weight is suspended from its rear end. Therefore, if the adhesive layer is formed by spraying a thick spray material such as magnesia using the same method used to form the base layer on top of the base layer, both layers will be completely adhered to each other via the anchors 3. The adhesion layer/l is thereby firmly supported. In addition, when the converter etc. is restarted, if the anchor 3 is made of steel, it will be heated to a high temperature and will gradually fuse with the adhesion layer l/ and the base layer λ, and the entire repaired part will now be completely integrated. When repaired using the spraying method, there is no layer-like peeling that occurs when it is repaired, and its durability is p/-2 charges longer than the conventional Cμ~j charge).

Therefore, the repair method of the present invention has the following effects.

(1) Deep and large vertical damage areas, both hot and cold, by using well-known combinations of spray material anchors and firing devices.

It can be easily, firmly and thickly sprayed for repair.

(2) In particular, anchors made of ceramics such as high alumina or zirconia can be firmly fixed to the damaged area through the underlying layer, so they can be used in high-temperature environments where metal anchors would easily melt and oxidize. Furnaces can be similarly spray repaired.

(3) Since layered peeling does not occur during operation, the durability of the repaired part is improved by 7 to 7 charges compared to conventional methods, and the spraying material can be used effectively without wasting it, so the basic unit of spraying material is reduced. This reduces maintenance (repair) work significantly.

As described in detail above, the repair method of the present invention involves first spraying a well-known spraying material onto the damaged area to be repaired to form a base layer, and then using a firing device to shoot a rather short and small rod-shaped anchor. It is a method to establish an adhesion layer by stabbing deeply into the base layer and spraying the spraying material on top of it using a conventional method, even in deep and large damaged areas.

Because it can be repaired firmly and thickly and does not peel off in layers during use, it has been confirmed that the durability of the repaired area is approximately 30% longer than with conventional spray repair methods.

[Brief explanation of the drawing]

FIG. 1 is a partial vertical sectional view showing an embodiment of the repair method of the present invention, and particularly shows the method of fixing the anchor to the base layer. FIG. 2 is a sketch showing several examples of anchors used in the present invention. In the figure, l: Damaged part, 2: Base layer, 3: Anchor. G... launcher, //... adhesion layer.

Claims (1)

[Claims] After spraying the spraying material to the required thickness on the damaged area, a base layer is formed, and then anchors are pierced at the required intervals by a firing device into the base layer, and the spraying material is further sprayed on top of that to form an adhesion layer. A method for repairing a damaged part of a refractory, characterized by providing a.