JPH0784988B2 - Irregular refractories construction method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an indefinite refractory material, particularly a cast refractory material, for various industrial kilns.

[0002]

2. Description of the Related Art One of the characteristics required of such a refractory casting structure is that the structure has a small number of internal pores and a high density.

[0003] Conventionally, as a means for increasing the filling degree of pouring into a frame, a method of pressurizing a pouring refractory,
For example, as described in Japanese Patent Publication No. 54-33206, there is known a vibration casting method in which a vibrating element is provided in a filling frame to vibrate a refractory.

Even if such a pressure cast molding or a vibration cast molding method is applied, gas is stored in the precast pouring refractory, and it is sufficient if the stored gas is not removed. It is not possible to obtain a high-density construction body.

Particularly, in a vacuum degassing apparatus for obtaining an ultra-low carbon steel, castable refractory has been used as a lining material in consideration of workability and maintainability, and has a high durability. There is a great demand for high-density construction products.

[0006] However, conventionally, in the construction of cast refractory such as cast molding, there is no document that discloses the concept of positively removing pores in the refractory to obtain a high-density construction body. .

[0007]

DISCLOSURE OF THE INVENTION The present invention provides an effective means for obtaining a high-density refractory construction product having a small porosity when constructing an irregular-shaped refractory.

[0008]

DISCLOSURE OF THE INVENTION The present invention is based on the idea of degassing a fluid refractory material in a vacuum atmosphere, and in particular, in the process of preparation and construction of a normal cast refractory material, a molding frame after preparation by a kneader. The above-mentioned object was achieved by making the injection route into the body a vacuum atmosphere.

[0009]

[Function] Degassing of a fluid refractory in a vacuum atmosphere is the largest in the injection path before the injection process where the area of the refractory itself exposed to the atmosphere is the largest, especially because of the movement of the material. If a vacuum atmosphere is created just before the space that is poured from the exit of the kneading machine where the area is the largest and the deaeration effect is most obtained, it is effective to deaerate the air entrained during kneading.

[0010]

EXAMPLE An example in which the present invention is applied to a casting process of a lining of a dipping pipe of a vacuum degassing apparatus used for refining ultra-low carbon steel will be described.

In FIG. 1, an injection frame body 4 is installed on the outside of a core metal 3 on which a brick lining 2 of a dipping pipe 1 is formed.
An apparatus for injecting the alumina castable prepared by the kneader 5 is shown therein. Reference numeral 6 denotes a pouring chute from the outlet 7 of the kneading machine 5 to the pouring frame body 4. Two pouring chutes 6 and pouring frame body 4 are provided with vibration exciters 8 at a total of four positions. ing. Reference numeral 9 denotes a deaeration pipe line from directly below the kneading machine outlet 7 of the pouring chute 6 and is connected to a vacuum pump (not shown). Therefore, the entire injection path from the outlet 7 of the kneading machine 5 to the inside of the injection frame 4 can be kept in a vacuum atmosphere.

Construction of a refractory using this equipment was carried out as follows.

First, the casting frame body 4 with the vibrator 8 is set on the castable construction portion of the dipping pipe 1, and the lower end of the brick or the casting frame body 4 and the casting chute are filled in order to shut off the pouring space from the atmosphere. The castable construction portion was sealed at the fitting portion with 6 by using a sealing material such as rubber. Then, the vacuum pump is operated to keep the whole of the injection frame 4 through the pouring chute 6 from the kneading machine outlet 7 under a vacuum atmosphere of 10 to 30 Torr, and then the kneading machine outlet 7 is opened to form the kneading refractory material. Inject. At the stage where the refractory was filled in the injection frame 4, the vacuum atmosphere was raised to 100 Torr and then cured for several hours. Then, the injection frame 4 was removed, and then it was heated to a maximum temperature of 1100 degrees for 48 hours and dried. The refractory construction body 10 was obtained.

Table 1 shows the physical properties of the alumina castable construction body constructed as described above, in comparison with a comparative example constructed under the atmospheric pressure using the same equipment. As shown in the table, it can be seen that the method of the present invention is excellent in any of specific gravity, porosity and compressive strength. Furthermore, Table 2
Shows the results of degassing molten steel using an immersion pipe having these constructions.

According to the method of the present invention, since it is a high-density construction body, the amount of melting loss is small, the number of repairs by spraying is small, the life of the immersion pipe is remarkably extended, and furnace materials such as refractory materials The cost was also reduced.

[0016]

[Table 1]

[0017]

[Table 2]

[0018]

The present invention has the following effects.

(1) It is possible to obtain a castable work body in which the work body is sufficiently deaerated, the work body structure is improved, and which has high strength, high corrosion resistance, high durability, and long life.

(2) It is not necessary to modify the pouring process itself, it is sufficient to install a vacuum deaeration device in the conventional equipment, and the equipment cost does not increase to the left.

(3) It can be applied to any kiln.

[Brief description of drawings]

FIG. 1 shows an example of equipment for carrying out a construction method of the present invention.

[Explanation of symbols] 1 dip pipe 2 brick lining 3 core metal 4 pouring frame 5 kneader 6 pouring chute 7 kneader outlet 8 vibrator 9 degassing pipeline 10 refractory construction

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Sumio Sakaki No. 1 Tobahata-cho, Tobata-ku, Kitakyushu-shi, Fukuoka New Nippon Steel Corporation Yawata Works (56) References Japanese Patent Publication Sho 59-34955 (JP, 59-34955) B2)

Claims (1)

[Claims] 1. A method for constructing an amorphous refractory material, wherein, in the process of preparing and constructing an amorphous refractory material, a vacuum atmosphere is used as an injection path to the molding frame after the preparation with a kneading machine.