JPH0143812B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is applicable to molten metal refining furnaces such as oxygen, inert gas, powder and granule blowing ladles, various reaction vessels, steel making furnaces, and blast gun furnaces. Relating to a molten metal container containing.

[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-XAC method, VAC 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, gases such as _O2 , Ar, Nz, air, or hydrocarbon gases are 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. There is.

As such a blowing structure, for example,
There is one described in Publication No. 1830.

[Problem that the invention seeks to solve]

However, such a blowing structure consists of a fixed plate brick fixed to the container and a sliding plate brick slidably attached to the fixed plate brick and equipped with a porous plug.
Because of the plate structure, the porous plug and the supply pipe that supplies fluid to the plug slide integrally with the sliding plate brick, making it difficult to handle the supply pipe. Furthermore, since the porous plug is fixedly attached to the sliding plate brick, it is not possible to easily and quickly replace it.

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

[Means for solving the problem]

In order to solve the above problems, in the present invention, a molten metal container is provided with a blow hole that penetrates the wall of the container and is aligned with the blow hole on the outer peripheral wall around the blow hole. Inner and outer fixing plate bricks each having a communicating hole are spaced apart and fixed in a superposed state, and a porous plug or a pore plug is attached to the communicating hole of the outer fixing plate brick, so that it can freely slide between both fixing plate bricks. A sliding plate brick is attached to the sliding plate, and the molten metal is brought into contact with the porous plug or the pore plug by aligning with the outer communicating holes of the inner and outer fixing plates in conjunction with the sliding of the sliding plate. alignment position,
It is constructed by drilling a through hole that is movable between non-aligned positions that do not come into contact with molten metal.

〔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 container 1 for receiving molten metal, and a part of the wall of the container 1 is penetrated to supply an inert gas or the like to the container 1.
It has a blow hole 2 for blowing into the air.

Further, reference numerals 3 and 4 are inner and outer fixing plate bricks which are fixed to the outer surface of the wall at intervals around the blow hole 2 and in a superposed state, and both fixing plate bricks 3, 4 has communication holes 5 and 6 that communicate with the blowing hole 2 in a part thereof, and a porous plug or a plug with fine holes 7 (hereinafter referred to as plug 7) is attached to the communication hole 6. has been done.

Further, 8 is a sliding plate brick that is slidably interposed between the inner and outer fixing plate bricks 3 and 4, and a part of the sliding plate brick 8 can be aligned with the communicating holes 5 and 6. A through hole 9 is provided.

Further, 10 is a supply pipe for supplying fluid to the plug 7.

Further, 11 is a spring that presses the outer fixing plate brick 4 toward the inner fixing plate brick 3, and 12 is a spring that presses the plug 7 against the outer fixing plate 4 via the pressing plate 13.

In this configuration, when the sliding plate brick 8 is slid and its through holes 9 are aligned with the communication holes 5 and 6 as shown in FIG. 1, the plug 7 comes into contact with the molten metal in the container 1. Become.

On the other hand, if the through hole 9 is brought to a position where it is closed by the inner and outer fixing plates 3 and 4 as shown in FIG. 1, it is possible to prevent the plug 7 from coming into contact with the molten metal.

The fluid injection operation in the molten metal container having the above structure will be explained below.

First, as shown in FIG. 1, the sliding plate brick 8 prevents the plug 7 of the outer fixed plate brick 4 from coming into contact with the molten metal, and then the molten metal is poured into the container 1. Note that steel may be received while supplying fluid to the plug 7.

After receiving the steel, the sliding plate brick 8 is slid to align the through hole 9 with the communicating holes 4 and 5, and the plug 7 attached to the communicating hole 5 supplies fluid to the molten metal in the container 1.

Note that even if the molten steel runs out, the fluid continues to be blown and the inner hole of the sliding plate is slid to the closed position.

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

In such a fluid supply, flow control is effected by sliding of the sliding plate brick 8, and the supply pipe 10 can be fixedly connected to the outer fixed plate brick 4. Therefore, the supply pipe 10 can be connected extremely easily and quickly.

Further, the plug 7 can also be easily replaced by removing the pressing plate 13 at the alignment position.

Furthermore, in the above embodiment, the contact pressure between the sliding plate brick 8 and the fixed plate bricks 3 and 4 is maintained, the small hole 6 is kept closed, and the contact pressure of only the outer plate brick 4 is maintained. Release the outer plate brick 4 to the outside (opposite side of the furnace) and replace the outer plate brick 4, or replace only the plug 7 if only the plug 7 is damaged. Thereafter, the outer plate brick 4 is moved toward the sliding plate 8, the surface pressure between the outer plate brick 4 and the sliding plate 8 is set, and the apparatus is set.

FIG. 2 shows another embodiment of the present invention, in which a through hole is further provided in the sliding plate brick 8, and in addition to the plug 7 for blowing gas into the through hole, a solid material 14 is also provided.
can be installed. With such a configuration, solid materials can also be blown into the molten metal by fluid pressure.

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).

This porous plug is made of a porous refractory brick, that is, a molded body made of gas-permeable porous material.

In the above, the required number of gas injection holes are drilled.

A plug that is made of refractory material and has the required number of gas injection holes (referred to as a plug with pores).

(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 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) Applicable not only to reciprocating type (reciprocating type) but also to rotating type (rotary type).

〔Effect of the invention〕

As described above, in the present invention, by forming the blowing structure provided on the wall into a three-plate configuration, there is no need to move the plate on which the plug is attached, so that the connection of the supply pipe to the plug is eliminated. This can be done easily, and the plug can also be easily replaced.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of a container for molten metal according to the present invention in a non-aligned position, and FIG. 2 is a longitudinal sectional front view of another modified example. In the figure, 1: Storage container, 2: Blow hole, 3: Inner fixing plate brick, 4: Outer fixing plate brick, 5: Communication hole, 6: Small hole, 7: Plug (porous plug or plug with small holes). ), 8: sliding plate brick, 9: through hole, 10: supply pipe, 11: spring, 12: spring, 13: pressing plate, 14: solid material.

Claims (1)

[Claims] 1. A blow hole is drilled through the wall of the container, and inner and outer fixing plate bricks each having a communication hole aligned with the blow hole are spaced apart on the outer circumferential wall around the blow hole. A porous plug or a pore plug is attached to the communicating hole of the outer fixing plate brick, and a sliding plate brick is attached between both fixing plate bricks so that the sliding plate brick can be slid freely. As the plate slides, it is freely movable between an alignment position where it aligns with the outer communicating holes of the inner and outer fixing plates and brings the molten metal into contact with the porous plug or pore plug, and a non-alignment position where it does not come into contact with the molten metal. A molten metal container having a three-plate type gas blowing structure characterized by having a through hole formed therein.