JPH0144764B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is applicable to blowing ladles, various reaction vessels, or molten metal refining furnaces such as steelmaking furnaces and hot metal furnaces for blowing oxygen, inert gas, gas mixed with powder and granules, etc. molten metal container.

[Conventional technology]

Generally, when refining molten metal, such as steel, in order to improve the quality of the steel, remove nonmetallic inclusions, and equalize the temperature of the molten metal, the general gas blowing method, LD-VAC method, VAD method, etc. From the bottom of the pot for the method, or DH (RH) for the DH method and RH method.
Gas is blown into the molten steel in the furnace from a part of the reaction vessel. In addition, AOD furnaces are being adopted in steelmaking furnaces, etc., in order to improve quality, improve productivity, economical processes, simplify operations, reduce costs, extend furnace lining, and various other purposes. In both cases, gas such as O ₂ , Ar, N ₂ , air, or hydrocarbon gas is injected into the molten metal in the furnace from the bottom of the container or near the bottom, either alone or in combination with powder or granules. I'm reading.

As such a blowing structure, for example,
There is one described in Publication No. 21830.

[Problem that the invention seeks to solve]

However, in such a blowing structure, since the cross section of the blowing hole and the spout of the porous plug is circular, in order to ensure a sufficient contact area between the porous plug and the molten metal, it is necessary to move the sliding plate brick to which the porous plug is attached. had to be driven over a considerable distance, which caused problems in terms of operability, such as an increase in the size of the drive device.

Further, with a porous plug having a circular cross section, even when it is perfectly aligned with the molten metal outflow hole, it is not possible to ensure a sufficient contact area between the molten metal and the gas.

An object of the present invention is to provide a molten metal container that can solve the above problems.

[Means for solving problems]

In order to solve the above problems, in the present invention, a molten metal container is provided with a blow hole penetrating through the wall of the container, and a fixing plate brick is fixed to the wall portion around the blow hole. Then, a communication hole that can be aligned with the above-mentioned blow hole is bored in the same fixed plate brick, and a sliding plate brick is installed on the fixed plate brick so as to be slidable in the direction intersecting the above-mentioned communication hole, and the same sliding plate a porous plug or a pore plug that is movable in conjunction with the sliding of the sliding plate to an alignment position where it aligns with the communication hole and contacts the molten metal; and at least one of the communication hole and the plug. It has a horizontally elongated shape that extends in the width direction.

〔Example〕

Hereinafter, means for solving the above problems will be specifically explained based on the embodiments shown in the attached drawings.

In FIG. 1, reference numeral 1 denotes a storage container that receives molten metal inside, and the container 1 has a container below the peripheral wall that penetrates the peripheral wall to blow inert gas or the like into the container 1. It has a blow hole 2.

Further, reference numeral 3 denotes a fixed plate brick which is fixed to the outer surface of the peripheral wall around the blow hole 2, and the brick 3 is provided with a communication hole 4 communicating with the blow hole 2 at its lower part. ing.

Further, 5 is a sliding plate brick attached to the upper surface of the fixed plate brick 3 so as to be slidable in a direction perpendicular to the width direction of the blow hole 2 and the communication hole 4. It has a small hole 6, and a porous plug or a plug with a hole 7 is inserted into the small hole 6.
(hereinafter referred to as plug 7) is removably fitted.

In such a configuration, the plug 7 can be moved with the sliding of the sliding plate brick 5 between a non-aligned position shown in FIG. 1 and an aligned position aligned with the communication hole 4.

In the non-aligned position, the plug 7 can be prevented from coming into contact with the molten metal, and in the aligned position, gas can be blown into the molten metal in the container 1 through the communication hole 4 and the blowing hole 2.

Further, 8 is a gas supply pipe connected to the plug 7, and 9 is a pressing plate with a spring element for generating a required surface pressure at the surface contact portion between the fixed plate brick 3 and the sliding plate brick 5. shows.

Furthermore, in the present invention, at least the communication hole 4 or the plug 7 extends in the width direction in the peripheral wall of the container 1, as shown in FIG. 2, so that the sliding plug brick 5 is slightly Even when sliding, the plug 7 can have a sufficient area aligned with the communication hole 4 and the blowing hole 2.

Hereinafter, the gas blowing operation in the molten metal container having the above structure will be explained.

First the plug 7 of the sliding plate brick 5 is in a non-aligned position blocked by the fixed plate brick 3, and then the molten steel is poured into the vessel 1.

After receiving the steel, the sliding plate brick 5 is slid in a direction perpendicular to the width direction of the blow hole 2 and the communication hole 4 to align the plug 7 with the communication hole 4, supply gas to the plug 7, and open the container 1. Gas is blown into the molten metal inside.

If metal is attached to the large opening of the blowing hole 2, the sliding plate brick 5 can be opened and the area washed with oxygen, and then set again to continue the gas supply.

In addition, in such a gas supply, since the communication hole 4 and the plug 7 extend in the width direction, a sufficient matching area can be secured even if the sliding plate brick 5 is slightly slid, and sufficient gas can be supplied with the shortest stroke. supply becomes possible.

Furthermore, such a blowing structure can diffuse the blown gas in the width direction of the wall body, making it possible to make effective contact with the molten metal, improving the quality of steel,
It is possible to further promote the removal of non-metallic inclusions, the uniformity of the molten metal temperature, and the like.

Further, FIG. 3 shows a case where the above configuration is applied from the reciprocating type (reciprocating type) shown in FIG. 1 to the rotating type (rotary type).

In addition, other features of the present invention are as follows.

(a) The fixing plate brick 3 can also be integrated into the storage container 1 in a buried form.

(b) In addition, the following can be considered as the plug 7.

A porous plug in which a gas-permeable porous or other air-permeable brick shaped into a truncated conical shape is removably fitted into the center or eccentric part of an ordinary refractory brick (sliding plate).

A porous plug in which the entire refractory brick is porous, that is, a molded body made of gas-permeable porous material.A porous plug as described above, in which a required number of gas injection pores are bored.

A plug with pores formed of a refractory material in the form described above, and having a required number of pores for blowing gas therein. A plurality of pores or porous bodies each having a circular cross section may be arranged in the width direction.

(c) Blowing can be performed freely in the center direction, vertical direction, and tangential direction with respect to the interior.

(d) Damage prevention material can also be interposed on the sliding surfaces of each brick.

(e) The plug 7 should be installed above the slag retention height.

(f) The lower surface of the blow hole 2 should be angled downward toward the inside of the furnace.

(g) When setting the surface pressure loading device, fixing plate, and plug plate, work can be done more quickly by using a cassette type or twist set type device.

(h) It can also be applied to a three-plate type blow-in structure.

〔Effect of the invention〕

As described above, in the present invention, since the communication hole or plug is extended in the width direction, a sufficient alignment area can be secured even if the sliding plate brick is slightly slid, and sufficient gas supply can be achieved with the shortest stroke. It becomes possible. That is, the gas blowing ability and the gas contact effect can be improved with the shortest stroke, and the sliding mechanism can be downsized.

In addition, such a blowing structure can diffuse the blown gas in the width direction of the wall and make effective contact with the molten metal, which improves the quality of steel, removes non-metallic inclusions, and melts the molten metal. It is possible to further promote uniformity of metal temperature.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view of a molten metal container according to the present invention, Fig. 2 is a front view of the blowing hole, communication hole, and plug in Fig. 1, and Fig. 3 is a configuration in the case of a rotary blowing structure. FIG. In the figure, 1: Storage container, 2: Blow hole, 3: Fixed plate brick, 4: Communication hole, 5: Sliding plate brick, 6: Small hole, 7: Porous plug or plug with small holes, 8: Supply pipe, 9: Pressing plate.

Claims (1)

[Claims] 1. A blow hole penetrating the wall of the container is drilled through the wall, a fixing plate brick is fixed to the wall around the blow hole, and a communication hole is provided in the fixing plate brick that can be aligned with the blow hole. A hole is drilled, and a sliding plate brick is installed on the fixed plate brick so as to be able to slide freely in a direction intersecting the communicating hole, and a sliding plate brick is installed on the fixed plate brick so as to be able to slide freely in a direction that intersects with the communicating hole. A horizontally elongated plug, characterized in that a movable porous plug or a pore plug is attached to an alignment position where it aligns and contacts the molten metal, and at least one of the communication hole and the plug has an oblong shape that spreads in the width direction. A molten metal container with a gas blowing mechanism.