JPS6267108A - Furnace for high temperature molten metal - Google Patents

Abstract

PURPOSE:To discharge the molten metal in a furnace without tilting the furnace body by providing an aperture to the bottom of the furnace body for a molten metal, communicating the aperture with a lifting pipe and rising gas in a foamed state from the bottom of the lifting pipe. CONSTITUTION:The molten metal A such as molten iron or molten steel is poured from a ladle 8 into the furnace body 1. The root end aperture 3a is provided to the bottom of the furnace 1 and is connected through a runner 3 to the lifting pipe 4 facing upward. A tapping spout 5 having a tap hole 3c is preliminarily attached to the top end in the lifting part 3b of the lifting pipe 4. The gas such as N2, Ar or CO2 is raised in the foam state from a refractory porous brick 7 attached to a gas intake port 6 provided in the bottom of the lifting pipe 4 in the stage of tapping the molten metal A from the furnace inside. The specific gravity of the molten metal A1 in the pipe 4 is decreased by the foam so that the molten metal rises in the pipe 4. The molten metal is transferred from the hole 3c into the ladle by the spout 8 without tilting the furnace body 1.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention makes it possible to discharge molten pig iron or molten steel (hereinafter referred to as molten metal) from various types of iron-making furnaces without tilting the furnace body. This invention relates to a furnace for high-temperature molten metal.

(Prior Art) In a refining furnace or the like, a method is generally adopted for discharging molten metal from the inside of the furnace by tilting the furnace body and discharging the molten metal from a tap opening provided in the upper part of the furnace wall.

(Problems to be Solved by the Invention) However, in a furnace that stores a large amount of molten metal, such as an iron storage furnace, the tilting mechanism of the furnace body not only affects the configuration of the entire equipment, but also accounts for a large part of the cost. There is a latent need for something that can tap water without tilting the furnace body.

In addition, in conventional batch furnaces, raw material charging, heating, refining, and tapping are performed for each heat, so the tapping method described above is sufficient, but recent developments such as continuous steel manufacturing are progressing. In the continuous refining process, there is a need for the development of a tapping method and a tapping port that allow hot water to be tapped continuously or arbitrarily while refining.

This invention was made in view of the above points, and it is an object of the present invention to provide a furnace for high-temperature molten metal that can discharge molten metal from the furnace in an upright position without tilting the furnace body. purpose.

(Means for Solving the Problems) In order to achieve the above object, the gist of the present invention is to communicate with the bottom of the furnace body, and have a -L-oriented molten metal lifting part, and to connect the furnace to the outside of the furnace. A high m-meter characterized by having a runner that opens the molten metal [-1] always at a position higher than the surface of the molten metal in the furnace, and a bubble generating means is provided at the lower part of the upward lifting part of the molten metal if.
Located in a furnace for molten metal.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a schematic diagram of an embodiment in which the present invention is applied to a pig iron storage furnace.

In the figure, reference numeral 1 indicates a furnace body, the inner surface of which is lined with a refractory material, and has a receiving port 2 at the top.

Reference numeral 3 denotes a runner attached to the furnace body 1, whose base end opening 3a leads to the bottom of the furnace, and in the middle part, an upward molten metal lifting part 3b is formed by a lifting area pipe 4, and the upper end of the molten metal lifting pipe 4 is open to the outside. The tapping troughs 5 each having a shape are connected to form the tapping opening 3c.

Reference numeral 6 denotes a gas inlet provided at the lower part of the lift pipe 4 in the runner 3, which is equipped with a foaming member 7 such as a porous brick in order to foam the gas, and is connected to an external gas supply device (not shown). ).

(for production) In the above configuration, the operation will be explained next.

The molten metal ^ introduced into the furnace by the ladle 8 is stored in the furnace, and also enters the runner 3 through the opening 3a at the bottom of the furnace.
Under normal conditions, the hot water surface B of the furnace body and the inside of the hot water lifting pipe 4 of the runner 3 are the same scene.

When hot water is tapped, when pressure gas is supplied from an external gas supply device to the gas inlet 6 provided at the bottom of the pumping area pipe 4, this gas is bubbled by the aerating member 7 installed in the gas inlet 6. Since it is blown into the molten metal in the lift pipe 3 and rises by -F, the molten metal A containing this bubble gas in the lift pipe 4
1 has a relatively light specific gravity, and at that point, it is pushed up by the action of bubble gas, that is, the action of a bubble pump, and when it reaches part 5 of the tap gutter, it becomes a pumping field flow and flows out from the tap port 3c and is discharged to the ladle 8. be done.

To adjust the amount of hot water being dispensed here, control the amount of gas supplied to the hot water pipe 3 through the gas inlet 6, and when stopping the tapping, the amount of gas supplied to the hot water pipe 3 through the gas inlet 6 is adjusted until the molten metal A does not flow back into the gas inlet 6. The hot water level in the lift pipe 3 may be lowered by reducing the supply amount.

The type of gas used in this invention will affect the life of the foaming member 7 installed in the gas supply port 6, the reaction with the molten metal, etc., but if these effects are taken into account. There is no particular limit to this, and various gases such as Nz + Ar I Cog can be used depending on the secondary purpose during refining.

FIG. 2 is a partial configuration diagram of a runner section showing another embodiment of the present invention.

In this embodiment, in order to compensate for the temperature drop of the molten metal in the 4 parts of the upward pumping pipe of the runner 3, a heating induction coil 9 is arranged in the 4 part of the pumping pipe to reduce the drop in the temperature of the hot water during tapping. belongs to.

FIG. 3 is a schematic diagram of an embodiment in which the present invention is applied to a converter.

In the figure, the basic structure of the furnace body 1 is the same as that of a well-known converter, but a runner 3 according to the present invention is provided to match the shape of the furnace bottom, thereby making continuous refining and continuous tapping possible. It is something.

In addition, numeral 10 in the figure is a bottom blowing stitch.

(Effects) As described above, this invention includes a runner having an upward molten metal raising part attached to the furnace main body, a gas inlet at the lower part of the upward molten metal raising part of the runner, and a gas inlet into the molten metal raising part through the gas inlet. The following effects are achieved by blowing bubble gas into the molten metal and discharging the metal by the action of a bubble pump.

(1) The discharge of molten metal from the furnace can be easily controlled by adjusting the flow rate of gas blowing into the runner while keeping the furnace body upright, making it possible to easily control the tapping, stopping, and tapping flow rate. Continuous refining and continuous tapping in various metallurgical furnaces are possible.

(2) In the case of a storage furnace, it is not necessary to tilt the furnace body to discharge the molten metal as in the past, so the equipment is simple.

(3) When applied to a converter, not only can the hot water be tapped after completion of blowing,
Hot water can also be tapped out during blowing, making continuous refining possible.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of an embodiment in which the present invention is applied to a pig iron storage furnace, Fig. 2 is a partial configuration diagram of a runner showing another embodiment, and Fig. 3 is an embodiment in which the invention is applied to a converter. FIG. l... Furnace body, 2... Inlet, 3... Runway, 4...
... Lifting hot water pipe, 5... Hot water gutter, 6... Gas inlet, 7
. . . Gas bubbling member, 8 . . . 9. Induction coil, 10 . . . Bottom blower.

Claims (1)

[Claims] It communicates with the bottom of the furnace body and has an upwardly facing hot water raising part,
A furnace for high-temperature molten metal, characterized in that it is equipped with a runner whose outlet opening to the outside of the furnace is always located at a higher position than the surface of the molten metal in the furnace, and a bubble generating means is provided at the lower part of the upwardly-facing molten metal part of the runner. .