JPS6051032B2 - How to repair damaged refractory parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for repairing damaged parts of lining refractories of converters, ladles, etc. by spraying, and an object of the present invention is to provide an improved repair method capable of repairing thickly and firmly without peeling. The purpose is to

When hot repairing a damaged part of the refractory lining of a converter (hereinafter simply referred to as the damaged part), after tapping the steel, water is generally reduced to about 10 to 15% by weight by a dry method or a wet method. A spraying material such as dolomite or magnesia with which the material is added is sprayed to a thickness of 30 to 50 m and 77 liters, but after using 4 to 5 charges (blowing), it becomes thinner and most of it falls off from the damaged area. , it was necessary to repeat repairs over and over again. By the way, as a technique that can be applied to solve such problems, there is a diamond-shaped metal anchor (external dimension 25 TK!
A hot repair method for converter bricks involves spraying the damaged area using a dry method with a spraying material containing 0.5 to 5% by weight of 0.5 to 5% by weight of 0.5 to 5 wt. ”
However, it is easy to clog in the material hose during work, and if it is sprayed too thick, it may fall off, so it cannot be applied to deeply damaged areas, and the anchor will not penetrate into damaged areas where there is no slag layer, so this method is not suitable. Repair methods cannot be implemented. In addition, as described in Japanese Patent Application Laid-open No. 55-20346, a small hole is pre-drilled diagonally in the wall surface of the damaged area, and a substantially T-shaped or X-shaped reinforcing bar (stud) is driven into the hole and fixed. There is a ``repair method for lining refractories in metallurgical furnaces and containers'' in which a wire is stretched over the wire and then a monolithic refractory is attached, but this method is time-consuming as it requires drilling a large number of small holes in the damaged area. , 300
There are problems such as it is virtually impossible to carry out at temperatures above ℃. In order to solve these problems, the present inventors conducted various studies and found that if a short rod-shaped anchor and spray material were used in combination, it would be easier and thicker than before, especially when hot. They discovered that the material could be sprayed without peeling off, and completed the repair method of the present invention.

J That is, the main point of the present invention is to first form a base layer of an appropriate thickness on the damaged area to be repaired by a conventional method,
Next, a short rod-shaped anchor is fired into the base layer using a well-known firing device, and an adhesion layer is applied on top of it by a similar spraying method, which causes vertical damage. It is possible to perform spraying repairs as thick and firm as 200 to 250 mm, and the durability of the repaired area is significantly improved.

The repair method of the present invention will be explained in detail below based on the drawings showing one embodiment of the present invention.

As shown in FIG. 1, the repair method of the present invention is to first form a base layer 2 with a thickness of 30 to 5 cm) on the inner surface of the damaged part 1 by a well-known spraying method as a preliminary preparation. It is to be.

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 1. It is better to have a higher

Further, as a means for forming the base layer 2, either a well-known dry method or a wet method may be used, but if the thickness is less than 3 Cym, the anchor 3 described later cannot be firmly fixed, and if the thickness is less than 5 Cym, In this case, the base layer 2 itself often cracks and peels off before the anchor 3 is fired and erected, so the above range is preferable. next,
While the base layer 2 is still a little soft, generally short rod-shaped anchors 3 are fired from a well-known firing device 4 and pierced at required intervals, and then the base layer 2 is further hardened and fixed.

The firing device 4 used for this purpose consists of a heat-resistant conduit 5 (for example, a stainless steel vibrator) in the shape of a straight tube or with a gently curved tip, and a narrow box-shaped storage part 6 and a small electromagnetic valve installed at the slightly rear part. 7 is installed behind it, and further,
Generally, it has a gun shape with an air hose 8 connected to the rear end, but some have a built-in strong spring instead of air. Alternatively, it may be of the type that is loaded with gunpowder or the like.

As shown in Figure 2, the anchor 3 is made of metal (steel, stainless steel) or ceramics, and has a diameter or side of 5 to 12 types and a length of 150 to 20 mm at the tip of a round or square rod. into an acute angle. A pointed one is generally used, but in order to blend well with the spray material, small grooves 9 may be provided on its side at appropriate intervals perpendicular to the axial direction, as shown in Figure 2b. . In addition, if the diameter is less than 5 gourds, the mechanical strength may be insufficient if it is made of ceramics.
If it is made of metal, it is susceptible to oxidation and wear, and if it exceeds 127 m, a large launcher 4 is required, so the above range is preferable. In addition, the length is determined according to the depth of the damaged part 1 to be repaired, that is, the repair thickness, but if it is less than 1501 r$&, it is too short and the effect of this repair method cannot be fully demonstrated. , 2007 m or more, the repaired portion 10 becomes too thick to 250 Tr0n or more and the surface layer may peel off, so the above range is preferable. Then, as shown in FIG. 1, the conduit 5 loaded with anchors 3 of various lengths into the storage part 6 is inserted so that the tip thereof extends approximately 1 Tr1 from the damaged area 1. After charging it into the furnace so that it reaches the desired position, the solenoid valve 7 is operated periodically to instantaneously introduce about 5k91ci1 of air.

Then, the anchors 3 are successively set at 50 to 70 Tr1 one by one.
,/second, and are pierced almost horizontally into the base layer 2, which is not yet completely hardened, at intervals about the same as the length of the anchors, so after several seconds. The base layer 2 is completely cured and baked by heating in a furnace or a separately provided small burner (not shown) for a minute. In addition, its firing speed is 5
If the speed is less than 07 TL/sec, 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 be pierced deeply into the base layer 2 until it reaches the inner surface of the damaged part 1, and if it is more than 70 TL/sec. If this happens, the anchor 3 will gain too much momentum, causing the anchor 3 to become slanted or even bounce off, so the above range is preferable. In addition, if you want to eliminate peeling of the adhesive layer 11 (indicated by imaginary lines) and repair it more firmly, as shown in Fig. 2c, a Y-shaped Use anchor 3 and attach a small hook 13 to the end,
It is preferable for the worker to hook it to a strong coil spring 14 attached to another support, use its elasticity to fire, and pierce it in the same way.

As the final step, after removing the firing device 4, a spraying vibrator (not shown) was similarly charged, and a well-known spraying material with as high corrosion resistance as possible was strongly hardened or sintered. The adhesion layer 11 may be formed by completely embedding the spray anchor 3 on the base layer 2 to a thickness of 150 to 20 hours.

At that time, if necessary, by wrapping paper tape around the rear of the anchor 3 or by using an anchor 3 that has been lightly coated with prone asphalt, the expansion of the adhesion layer 11 in the vertical and horizontal directions will be moderate when restarting the operation. It is very effective in preventing peeling because it is absorbed by the water and does not cause cracks.

When the damaged part 1 is repaired in this way, the anchor 3 has its tip attached to the base layer 2 in close contact with the damaged part 1 by 30 to 5
``It is firmly fixed to the depth of the hole, and will not tilt unfavorably even if a weight of approximately 10k9 is suspended from the rear end. Therefore, when the adhesion layer 11 is formed by spraying a thick spray material such as magnesia using the same method used to form the base layer 2 thereon, both layers are completely adhered to each other via the anchors 3. At the same time, the adhesive layer 11 is firmly supported thereby. 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 gradually fuse with the adhesion layer 11 and the base layer 2, and the entire repaired part will be completely integrated, so it will not be possible to use conventional spraying. The layered peeling that occurs when repairing using a method is no longer noticeable, and its durability is better than that of conventional methods (4.
~5 charges) is 1 to 2 charges longer. Therefore, the repair method of the present invention has the following effects.

(1) By using a well-known combination of spray material anchors and firing devices, even deep and large vertical damage areas can be repaired easily, firmly, and thickly by spraying, regardless of whether it is hot or cold. Can be done. (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, whereas metal anchors are easily oxidized and oxidized. High temperature furnaces can be similarly spray repaired.

(3) Since layered peeling does not occur during operation, the durability of the repaired part is improved by 1 to 2 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 spraying a well-known spray 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. This is a method of stabbing deeply into the base layer and applying spraying material on top of it using a conventional method to form an adhesion layer.Even deep and large damaged areas can be repaired firmly and thickly. Because the repair does not peel off, the durability of the repaired area is approximately 30% longer than with conventional spray repair methods.

[Brief explanation of drawings]

FIG. 1 is a partial longitudinal 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, 1... damaged part, 2...
Base layer, 3...anchor, 4...launching device, 11...adhesion layer.

Claims (1)

[Claims] 1 After spraying the spray material to the required thickness to form a base layer on the damaged area, use a firing device to pierce the anchors at the required intervals into the base layer, and then spray the spray material on top of the anchors to adhere. A method for repairing a damaged part of a refractory, characterized by providing a layer.