JPH0143814B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is applicable to blowing ladles, various reaction vessels, or melting devices such as oxygen, inert gas, and gases mixed with powder or granules, or steelmaking furnaces, blast gun furnaces, etc. Regarding metal containers.

[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 PH 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.

For this purpose, the gas is normally blown into the furnace lining using pre-formed injection holes when constructing the furnace lining.

As a blow-in structure, for example,
Some of these are described in JP-A-21830 and JP-A-46-2503.

[Problem that the invention seeks to solve]

However, in both cases, the blowing direction is perpendicular to the sliding surface, so convection of the molten metal cannot occur, and the contact between the molten metal and the gas and the stirring effect cannot be sufficiently achieved. Nakatsuta.

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

[Means for Solving the Problems] In order to solve the above problems, in the present invention, a molten metal container is provided with a blow hole penetrating the wall of the container, and a blow hole is formed around the blow hole. A fixed plate brick is fixed to the wall part, a communication hole is bored in the fixed plate brick that can be aligned with the above-mentioned blow hole, and a sliding plate brick is slidably attached on the fixed plate brick. 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 is attached to the sliding plate, and the blowing axis of the plug is slid. The sliding surface of the moving plate is inclined.

〔Example〕

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

[First Embodiment] (Fig. 1) In Fig. 1, reference numeral 1 denotes a storage container 1 for receiving molten metal therein, and the container 1 has a container below its peripheral wall, penetrating through the peripheral wall, Container 1 for inert gas, etc.
It has a blow hole 2 for blowing into the air.

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 has a communicating hole 4 communicating with the blow hole 2 in a part thereof. It is set up.

Moreover, 5 is a sliding plate brick attached to the upper surface of the fixed plate brick 3 in an overlapping state and rotatably arranged around the axis A.

The sliding plate brick 5 has a plurality of pore plugs or porous plugs 7 spaced apart in its circumferential direction.
a, 7b (hereinafter referred to as plugs 7a, 7b), and these plugs 7a, 7b are connected to the fixed plate brick 3 as the sliding plate brick 5 rotates.
It can be aligned with the communication hole provided in the. Also, by rotating and sliding the sliding plate brick 5, the plugs 7a, 7b can be brought into a non-aligned position.

Furthermore, the plug 7a is perpendicular to the sliding plate brick 5 with its blowing axis;
The plug 7b is inclined with respect to the axis.

In the non-aligned position, the plug 7a,
7b from coming into contact with the molten metal, and at one matching position (not shown), the fluid can be blown into the molten metal in the container 1 in the normal direction through one of the plugs 7a, the communication hole 4, and the blowing hole 2. In addition to that shown in FIG. 1, at the alignment position, the molten metal in the container 1 flows downward through the other plug 7b, the communication hole 4, and the blowing hole 2, causing convection of the molten metal in the vertical direction inside the container. can be caused.

Further, 8 indicates a gas supply pipe connected to the plugs 7a and 7b, and 9 indicates a pressing plate with a spring for generating surface pressure at the surface contact portion between the fixed plate brick 3 and the sliding plate brick 5.

The gas blowing operation in the molten metal container having the above structure will be explained below.

First, the plugs 7a and 7b of the sliding plate brick 5
is in a non-aligned position blocked by a 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 rotated and slid relative to the fixed plate brick 3 to form a plug 7.
a is aligned with the communication hole 4, fluid is supplied to the plug 7a, and the fluid is blown into the molten metal in the container 1 in the normal direction. Thereafter, the sliding plate 5 is driven again to align the plug 7b with the communication hole 4 as shown in FIG. 1, and the fluid is supplied into the container 1 in a downward direction to generate convection of molten metal in the vertical direction. This can increase the effect of stirring the gas with the molten metal.

[Second Embodiment] (Figures 2 and 3) In this embodiment, a reciprocating type (reciprocating type) blowing structure is used, and as shown, the sliding plate brick 5 is connected to the container 1 It has a plug 7 into which gas can be blown tangentially.

With this configuration, the gas blown in from the plug 7 causes horizontal convection within the container, and as in the first embodiment, contact and stirring between the gas and the molten metal can be improved.

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) Furthermore, the following plugs can be considered as the plugs 7a and 7b.

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.

(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 plugs 7a, 7b, 7 should be installed above the slag retention height.

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

(F) For setting the surface pressure loading device, the fixing plate brick 3, and the plugs 7a, 7b, the work can be done more quickly by using a cassette type or twist set type device.

(g) Not only a rotary type but also a reciprocating type can be used.

(h) In order to have different blowing areas, in addition to making the areas of single plugs different, they should also be formed from a plurality of pores or through-holes with the same area, and their numbers should be different. You can also

(li) It can also be applied to a three-plate type blowing structure.

(J) It is also possible to mutually change the blowing direction.

〔Effect of the invention〕

As described above, the present invention can achieve the following effects.

(a) Since the gas injection direction of the plug is tilted with respect to the sliding surface of the sliding plate brick, the injection angle can be adjusted arbitrarily, and convection can be generated in the molten metal in the container, so that the gas can promote contact and stirring between the metal and the molten metal.

(b) Since the gas injection direction of the plug was tilted,
Molten metal can be prevented from flowing into the plug during operation.

(c) The blowing direction can be changed without stopping the operation.

(d) There is no need to provide an inclined blow hole integrally with the container during lining construction or recycling work.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of a molten metal container according to a first embodiment of the present invention, FIG. 2 is a longitudinal sectional front view of the second embodiment, and FIG. 3 is a plan view thereof. In the figure, 1: Container, 2: Blow hole, 3: Fixed plate brick, 4: Communication hole, 5: Sliding plate brick, 7a, 7b, 7: Plug (porous plug or plug with pores), 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 slidably mounted on the fixed plate brick, and the sliding plate is aligned with the communicating hole and comes into contact with the molten metal in conjunction with the sliding of the sliding plate. A gas blowing device with a tilted plate sliding surface, characterized in that a movable porous plug or a pore plug is attached to an alignment position, and the blowing axis of the plug is tilted with respect to the sliding surface of the sliding plate. A molten metal container with a built-in plug.