JPH108129A - Method for quickly repairing immersion vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a quick repairing method of an immersion vessel so as to obtain high durability of worn part at lower end part of the immersion vessel with a small amount of repairing material, in the immersion vessel used at the time of treating molten steel, etc. SOLUTION: When repairing the worn part at lower end part 12 of the immersion vessel 11 for treating the molten steel, etc., a material holding water content as crystal water in the repairing material as it is left in powder state is filled into a vessel 14 having a prescribed shape and size. The worn part in a high surface temp. state at lower end part 12 of the immersion vessel 11 after treating is closely attached and pressed to the repairing material in the vessel 14 to exhaust the water content in the repairing material with the stored heat in the lower end part 12 of the immersion vessel 11, and the fluidity is given to the repairing material, and after penetrating the repairing material into the worn part, the repairing material is hardened to execute the repairing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an immersion tank used for treating molten metal such as molten steel, which can quickly and durably repair a worn portion at the lower end of the immersion tank. It relates to a quick repair method for immersion tanks.

[0002]

2. Description of the Related Art In the treatment of molten steel, a refining facility in which a dipping tank made of a refractory is immersed in the molten steel is generally used mainly for the purpose of vacuum treatment of the molten steel, prevention of scattering, improvement of the yield of added materials, and the like. Used in The immersion tank comes into contact with the molten steel, and when stirring the molten steel in the tank, the refractory is worn.
In particular, since the lower end of the immersion tank is located at a position where it collides with the flow of the molten steel, the abrasion is severe, and it is a part that determines the life of the immersion tank. For this purpose, a method of repairing the lower end of the immersion tank has been implemented. For example, as described in Japanese Utility Model Laid-Open No. 61-47055, when the immersion pipe at the lower part of the immersion tank is repaired, A method of inserting a refractory sleeve into a gap between the outer peripheral portion of the refractory sleeve and the inside of the worn immersion tank tube, or a method disclosed in JP-A-59-96.
As described in Japanese Patent Publication No. 212, there is a method in which a spray material is applied to a lower end portion of a worn immersion tank by a spray nozzle.

[0003]

However, the refractory sleeve is inserted into the immersion pipe as described in Japanese Utility Model Application Laid-Open No. 61-47055, and the outer periphery of the refractory sleeve and the worn immersion tank pipe are connected. The method of press-fitting an indefinite refractory into the gap between the inside and the inside requires a refractory sleeve to be inserted and an indefinite refractory to be press-fitted, and also requires a facility for kneading and feeding the indefinite refractory and performing such work. In addition, after the repair, curing and drying of the indefinite refractory is required, so the repair time must be extended. Also, Japanese Unexamined Patent Publication No.
In the method of applying a spraying material to the lower end of an immersion tank as described in Japanese Patent No. 96212, the repair material and the repair time are small, but the spray repairing has low durability and a large amount of spraying. If it is repaired, the repair material may hang down, and there is a problem that sufficient repair cannot be performed.
The present invention has been made in view of such circumstances, and in a dip tank used when processing molten steel or the like, the wear portion at the lower end of the dip tank is highly durable, has a small repair material, and is quickly repaired. It is an object of the present invention to provide a method for quickly repairing an immersion tank capable of performing the repair.

[0004]

According to the present invention, there is provided a semiconductor device comprising:
The immersion tank quick repair method described is to repair the worn part at the lower end of the immersion tank that treats molten steel, etc., while maintaining the water as crystallization water in the repair material in powder form. ,
By filling the worn part in a state where the surface temperature of the lower end of the immersion tank after the treatment is at a high temperature with the repair material in the container and pressing the same, the immersion tank is filled. After the moisture in the repair material is released by the heat storage at the lower end of the material, the repair material is given fluidity and the repair material penetrates into the wear portion, and then cured and repaired.

[0005] The immersion tank quick repair method according to claim 2 is the immersion tank quick repair method according to claim 1, wherein the repair material has a water content of 10 to 15% as crystallization water, and The surface temperature of the lower end of the tank is 300 to 500 ° C. The immersion tank quick repair method according to claim 3 is the immersion tank quick repair method according to claim 1, wherein the water content as crystallization water in the repair material is 15 to 20%, and the immersion tank after the treatment is used. Has a surface temperature of 500 to 700 ° C.

[0006] Since the surface temperature of the lower end of the immersion tank after the treatment is in a high temperature state (for example, 300 to 700 ° C), water as crystallization water in the repair material is separated by the heat storage,
The fluidity of the repair material is developed, and the repair material can easily penetrate into the worn portion. The amount of water as crystallization water in the repair material is determined by the amount of heat stored at the lower end of the immersion tank. In the case of 300 to 500 ° C, the water content is 10 to 15%, and in claim 3, the water content is 15 to 20% when the surface temperature of the lower end of the immersion tank after the treatment is 500 to 700 ° C. It has a water content of 1
If the content is less than 0% or 15%, the fluidity of the repair material is less likely to be exhibited, while if the water content exceeds 15% or 20%, the repair material takes a long drying time and the durability of the repair material is low. Because it is inferior.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is a schematic configuration diagram of a repairing apparatus to which the immersion tank quick repairing method according to one embodiment of the present invention is applied, and FIG. 2 is a cross-sectional view taken along line AA of FIG.

[0008] A repair apparatus 10 to which the rapid repair method of an immersion tank according to one embodiment of the present invention is applied includes a powdery repair material 13 to be applied to a lower end portion 12 of an immersion tank 11 worn by molten steel. In addition, it consists of an annular container 14 that regulates the outer shape of the repair material 13 after construction. Annular container 1
4 is an outer and inner ring 14a, 14b made of a steel plate having the same length but different diameters forming side surfaces of the container 14;
And an annular plate 14c made of a steel plate, which constitutes the bottom surface of the above, is assembled by welding or the like. Outer and inner rings 14a, 1
The diameters D ₁ and D ₂ of 4b are for the refractory when the lower end 12 is worn when the lower end 12 of the immersion tank 11 is inserted into the container 14.
The inside and outside of the refractory are determined so that a gap G of about 100 mm can be maintained. In addition, outer and inner rings 14
The height H of a and 14b is determined so as to be slightly higher than the range in which the lower part of the immersion tank 11 is melted and damaged. The thickness of the outer and inner rings 14a, 14b and the annular plate 14c is set to about 3.2 mm in consideration of rigidity during handling and construction.

Next, the repair material 13 used in the rapid repair method of the immersion tank according to one embodiment of the present invention will be described in detail. Table 1 shows the composition of the repair material 13. The material depends on the type of steel to be treated, but MgO, Al ₂ O ₃ , Si
An artificial powdered refractory containing O ₂ as a main component and further containing water of crystallization is used.

[0010]

[Table 1]

The crystal water is separated from the main component by heat,
Release gives fluid to the repair material. The relationship between the water content of the crystallization and the calorific value is such that the higher the temperature in the lower part of the immersion tank, the more the crystallization water, in order to express the characteristics of both the flow of the repair material and the rapid hardening due to the release of the crystallization water in this repair method. There is. The method of supplying heat to the repair material depends on the heat storage at the lower end of the immersion tank obtained by the operation. By applying the heat storage at the lower end portion of the immersion tank to the powdery repair material, the repair material is given fluidity. Therefore, even if the wear portion at the lower end portion of the immersion tank is uneven, repair is performed. The material easily penetrates the wear site, thereby improving the durability of the repaired construction. Further, the kneading work at the time of construction is omitted, and the supply of the repair material to a specific portion becomes easy, so that the repair work can be simplified and the timing can be arbitrarily achieved. The amount of water as crystallization water is determined by the heat storage amount of the immersion tank, and the surface temperature of the lower end of the immersion tank is 10 to 1 when the surface temperature is 300 to 500 ° C.
Experiments have confirmed that at 5% and 500 to 700 ° C, a water content of 15 to 20% is most suitable for repair.
That is, in each case, if the water content is less than the water content, the repair material cannot be sufficiently imparted with fluidity, so that it is difficult to perform uniform work at a necessary portion and the repair strength of the repaired body is reduced. In this case, it takes a long time to adhere and harden, and the strength of the repaired body does not appear.

Next, an immersion tank quick repair method according to one embodiment of the present invention using the repair device 10 will be described. First, the lower end 1 of the immersion tank 11 to be repaired
In accordance with the situation of wear of 2, the required amount of the repair material 13 prepared with the optimum component is put into a container 14 arranged at a predetermined position in the repair place. Next, after the metal or slag at the wear site of the immersion tank 11 to be repaired is removed by a required device, the immersion tank 11 is transported onto the container 14 by a hoist or the like. After confirming that the surface temperature of the lower end portion 12 of the immersion tank 11 is appropriate for the repair material 13 placed in the container 14, the lower end portion 12 of the immersion tank 11 in the state of storing heat is lowered by a lifting machine. It is pressed against the repair material 13 and brought into close contact therewith. The surface temperature of the lower end portion 12 of the immersion tank 11 immediately after the molten steel treatment is 150
The temperature is raised to about 0 ° C., and even after about 30 minutes from the treatment, the heat is stored at 500 to 800 ° C.
The heat storage 1 can use this heat and depends on the amount of crystal moisture of the repair material 13, but it is sufficient that the surface temperature is 300 to 700 ° C. Immersion tank 11 with repair material 13 stored in heat
The repair material 1 is pressed against the lower end 12 of the
Since the crystal water in 3 is separated and imparts fluidity to the repair material 13, the repair material easily penetrates into the wear site, thereby forming a repair work body in a short time.

[0013]

Example: Outer diameter d at the time of wear of vacuum degassing equipment for molten steel
The repair of the worn part at the lower end of a large immersion tank having a diameter of ₁ is 3200 mm and an inner diameter d ₂ of 2200 mm is performed by a height H of 200 mm, an outer ring diameter D ₁ of 3300 mm, and an inner ring diameter D _2.
An example in which a container having a diameter of 2100 mm was used in accordance with the rapid repair method for an immersion tank according to one embodiment of the present invention will be described.

(Example 1) 1 ton of a repair material having the composition shown in Table 1 was charged into a container. A container filled with the repair material is placed below the immersion tank after the molten steel treatment, and the surface temperature of the lower end of the immersion tank is 400 ° C. 30 minutes after the end of the molten steel treatment.
When the immersion tank was lowered, the immersion tank was lowered, brought into close contact with the repair material, and held for 30 minutes to cure the repair material. Thereafter, the immersion tank was raised and separated from the container, and the following treatment was performed. The repair material adhered to the lower end remained during the degassing treatment of the molten steel of 40 charges, protecting the lower end of the immersion tank and extending the life.

(Example 2) 1 ton of a repair material having the composition shown in Table 1 was charged into a container. A container filled with the repair material is placed below the immersion tank after the molten steel treatment, and the surface temperature of the lower end of the immersion tank is 600 ° C. 20 minutes after the end of the molten steel treatment.
When the immersion tank was lowered, the immersion tank was lowered, brought into close contact with the repair material, and held for 30 minutes to cure the repair material. Thereafter, the immersion tank was raised and separated from the container, and the following treatment was performed. The repair material adhered to the lower end remained during the degassing treatment of the molten steel of 40 charges, protecting the lower end of the immersion tank and extending the life. Table 2 shows the results of comparison between repairing a worn portion at the lower end of the same large immersion tank by a press-fitting method and a spraying method.

[0016]

[Table 2]

As is clear from Table 2, in Examples 1 and 2, the number of usable charges is inferior to that of the press-fitting method, but the repair time is 1/6 to 1/5, and the repair is quick. Can work. Also, as compared with the spraying method, the repair time is about 50 minutes, which is almost the same, but it can be seen that the number of usable charges is ten times, which leads to the improvement of the service life. Therefore, the immersion tank quick repair method according to one embodiment of the present invention combines the advantages of both the conventional press-fitting method and the spraying method, and can quickly repair a worn part, and has a long service life. There can be.

In the embodiment of the present invention, the immersion tank is described as treating molten steel. However, the present invention is similarly applicable to immersion tanks for treating molten iron, so-called molten iron. In addition, the repair material is usually filled evenly over the entire circumference of the container ring, but if the specific portion at the lower end of the immersion tank is severely worn, increase the filling amount of the corresponding portion. This makes it possible to repair a specific part. As a method of retaining the increased filling amount of the corresponding part, there is a method of maintaining the shape of the repaired part by putting the repair material of the part in a plastic bag. When the repair is selectively performed in this manner, the time required for the repair material to penetrate is further reduced, so that the repair can be performed in a shorter time. Furthermore, although the shape of the container was annular,
The container can be shaped to match the shape of the lower end of the immersion tank.

[0019]

According to the rapid repair method of the immersion tank according to the first to third aspects, when repairing a worn portion at the lower end of the immersion tank for treating molten steel or the like, water as crystallization water is retained in the repair material. The treated powder is filled in a container of a predetermined shape and size as powder, and the worn part where the surface temperature of the lower end of the treated immersion tank is high is used as a repair material in the container. By contacting and pressing, the moisture in the repair material is released by the heat storage at the lower end portion of the immersion tank to impart fluidity to the repair material, so that the repair material penetrates into the wear portion, and is cured and repaired. ing. Therefore, without significantly affecting operations
Construction of a durable repair material can be performed in a short time, thereby significantly reducing the cost of the refractory and the repair cost.

In particular, in the immersion tank quick repair method according to the second and third aspects, when the surface temperature of the lower end of the immersion tank after the treatment is 300 to 500 ° C. or 500 to 700 ° C., the crystal is contained in the repair material. The amount of water as water is 10 ~
Since 15%, 15% to 20% of the material is filled into the container as powder, the surface temperature of the lower end of the immersion tank after the treatment varies depending on, for example, the capacity of the immersion tank and the surrounding environment. However, the durable repair material can be constructed in a short time only by changing the water content of the crystallization water in the repair material.
Thereby, the cost of refractories and the repair cost can be further reduced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a repair apparatus to which an immersion tank quick repair method according to an embodiment of the present invention is applied.

FIG. 2 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

10 repair device 11 immersion tank 12 lower end 13 repairing material 14 container 14a outer ring 14b in the ring 14c annular plate D ₁ height of the outer ring diameter D diameter d ₁ of ₂ in the ring outer diameter d ₂ inside diameter H container

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hideyuki Ishikawa 1-1-1, Hibata-cho, Tobata-ku, Kitakyushu-shi, Fukuoka New Nippon Steel Corporation Yawata Works

Claims (3)

[Claims] When repairing a worn portion at a lower end portion of an immersion tank for treating molten steel or the like, a predetermined shape and size of a repair material which retains moisture as crystallization water as powder is used. The container is filled in advance, and the surface temperature of the lower end of the immersion tank after the treatment is brought into close contact with the repair material in the container by pressing the worn part in a state where the temperature is high, thereby lowering the lower end of the immersion tank. After releasing the moisture in the repair material by the heat storage to impart fluidity to the repair material and allow the repair material to permeate the wear portion,
An immersion tank quick repair method characterized by curing and repairing. 2. The repair material has a water content of 10 to 15% as crystallization water, and a surface temperature of a lower end portion of the immersion tank after the treatment is 300 to 500 ° C.
Immersion tank quick repair method described. 3. The repair material according to claim 1, wherein the water content as water of crystallization in the repair material is 15 to 20%, and the surface temperature of the lower end portion of the immersion tank after the treatment is 500 to 700 ° C.
Immersion tank quick repair method described.