JPH0770618A - Device for forming remaining iron removal hole in trough for molten iron and formation thereof - Google Patents

Abstract

PURPOSE:To facilitate the opening work of a removal hole for remaining iron by fitting a forming device for remaining iron removal hole in a mold form for through, at the time of pouring a castable refractory between an iron tapping trough for blast furnace and the mold form for trough. CONSTITUTION:Before pouring a castable refractory 13 between the iron tapping trough 12 for blast furnace and the mold form 11 for trough, a piston rod 20a is advanced from a cylinder device 20 arranged to the mold form 11 for trough. Then, an intermediate rod 19 is advanced through a guide pipe 21 and the mold form 17 for remaining iron removal hole composed of a cylindrical air-tight flexible material is arranged to the lower part in a mold form for molten iron weir positioned at a skimmer part 14. Successively, gas is supplied into the mold form 17 for remaining iron removal hole through a gas carrying tube 18c and bulged and the castable refractory 13 is poured into gap between the trough 12 and the mold form 11 and at the same time, poured into the mold form for molten iron weir and dried and hardened. At the time of completing the drying and the hardening, the mold form 17 for remining iron removal is exhausted and shrunk and taken off to form the remaining iron removal hole in the molten iron weir 15. By the method, the heavy labor of worker and the work in bad environment are eliminated, and the remaining iron removal hole is easily formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for forming a residual iron hole for removing the hot metal remaining at the bottom of a refractory material formed on the inner surface of a gutter for molten metal. In particular, the present invention relates to an apparatus and a method for forming a residual metal tap hole for a molten metal gutter, which forms a residual iron tap hole in a molten iron weir located at a skinmer portion of a blast furnace taphole.

[0002]

2. Description of the Related Art Generally, casting equipment for extracting molten iron and slag that has fallen into the pool of blast furnace from the taphole to the outside of the furnace is generally equipped with tapping holes and tapping machines that open tapholes. It is composed of a mud gun that closes the pig iron, and a tap iron gutter that flows molten iron and slag. The tap hole is opened after a time when the melting inside the blast furnace has sufficiently progressed and a predetermined amount of tap metal is possible, and is closed after the predetermined amount of tap metal is completed. The hot metal and slag extracted from this taphole pass through a tappipe with a length of about 20 m, but in the blast furnace, about 300 kg of slag is produced for 1 t of hot metal. A part of this slag is extracted from the tap hole, but most of it is extracted from the tap hole together with the hot metal.

Therefore, it is necessary to separate the hot metal and the molten metal at the casting floor, and the molten metal F and the molten metal S are separated by the skinmer portion 2 provided on the upstream side of the tap pipe 1 as shown in FIG. Are separated using the difference in specific gravity. As shown in the figure, in the skinmer portion 2, a slag weir 3 for blocking a slag S having a low specific gravity (specific gravity: about 2.5) and a molten iron F having a high specific gravity (specific gravity: about 7)
And the hot metal weir 4 for adjusting the flow rate of the above are alternately formed vertically. The molten metal weir 3 and the molten metal weir 4 are formed by drying and solidifying an amorphous refractory, and are simultaneously formed when the amorphous refractory is molded on the inner surface of the tap pipe 1.

That is, the slag S blocked by the slag weir 3 is discharged from the slag gutter 5 provided in front of it. On the other hand, the hot metal F passes under the molten metal weir 3, passes through the upper side of the molten metal weir 4, and flows down to the downstream side thereof on the tap pipe 1. However, when the residual amount of the hot metal F becomes small and the molten metal surface is located below the hot metal weir 4, the hot metal F remains on the upstream side of the hot metal weir 4. When the residual pig iron F is solidified, it is difficult to remove it, so it is necessary to discharge it.

Conventionally, as shown in FIG. 4, the discharge of the residual iron F is carried out by opening a residual iron removing hole 6 in the lower portion of the molten iron weir 4 with an opening machine (not shown). It was made by extracting the residual iron F from the hole 6. However, because the hardness of the refractory that constitutes the hot metal weir 4 is high, the operation of opening the residual pig iron hole 6 requires a long time for opening and is exposed to high heat, which is a heavy labor in a bad environment. It was

Therefore, recently, a residual iron vent hole 6 is previously formed in the hot metal weir 4, and a refractory material having a relatively low hardness is filled in the residual iron vent hole 6 to leave the residual iron. When F is discharged, the residual iron hole 6 is easily reopened.

As a measure for omitting such a hole forming operation, there is disclosed a technique for scraping out residual iron by a scraping plate as disclosed in JP-A-54-117304, and JP-A-61-161.
A technique for removing residual iron after it has solidified as disclosed in Japanese Patent No. 91306 has been proposed.

[0008]

The conventional residual iron removal technology has the following problems. That is, in the technique of pre-drilling the residual pig iron hole 6, although this pre-drilling work is not a work under high heat, the hardness of the refractory material forming the hot metal weir 4 is also high, so that it is hard work. There was a problem that was not solved.

Further, in the technique for scraping off the residual iron with the scraping plate, the cross-sectional shape of the tapping metal trough through which the hot metal has passed is non-uniform due to melting damage, so that the residual hot metal cannot be completely scratched out. Have difficulty. Therefore, if the residual iron that could not be scraped out solidifies, a large number of personnel are required for the removal work, resulting in a problem of heavy labor.

Further, in the technique of removing after solidification of residual pig iron, since the broken pieces of the solidified pig iron have a high weight, there is a problem in that it is similarly heavy labor.

In view of the above problems, an object of the present invention is to provide an apparatus and a method for forming a residual tap hole for a molten metal gutter, which can eliminate the heavy labor of a worker and the work in a bad environment. is there.

[0012]

Means for Solving the Problems In order to achieve the above object, an apparatus for forming a residual iron hole for a molten metal gutter according to the present invention is provided inside a molten metal gutter, and an amorphous refractory is provided on the inner surface thereof. In the gutter mold to be formed, a tubular-shaped mold for residual iron hole that advances and retreats into the gutter mold attached to a predetermined position of the gutter mold so as to penetrate into the gutter longitudinal direction. It is equipped with a frame and a mold advancing / retracting device for operating the mold for the residual iron hole.

In the structure of the above-mentioned residual iron hole forming apparatus,
Preferably, the mold for the residual iron vent hole is formed of an airtight flexible material, and a gas supply / discharge means for supplying / discharging a gas and expanding / contracting the gas is provided therein.

Further, it is preferable that the mold for the residual pig iron hole is formed of a tubular body whose surface is coated with a lubricant.

On the other hand, in the method for forming a residual tapping hole for a molten metal gutter according to the present invention, a gutter form is provided inside the molten metal gutter, and an irregular shape is provided between the gutter and the gutter form. When casting the refractory and forming the inner refractory wall, a cylindrical form for the residual iron hole is formed in the lower part of the form for the molten metal weir located at the skinmer part so that it penetrates in the gutter longitudinal direction. After arranging and pouring the amorphous refractory into the hot metal weir mold and drying and solidifying the refractory material, pull out the residual iron vent hole mold from the hot metal weir mold. It is designed to form a residual iron drainage hole.

[0016]

According to the construction of the above-mentioned apparatus for forming a residual iron tap hole for a molten metal, a tubular form for a residual tap hole for a tubular shape is formed in a gutter frame for molding an amorphous refractory on the inner surface of the gutter for molten metal. It is equipped with a formwork and a formwork advancing / retreating device for operating this formwork for the residual iron hole. The mold for the residual iron hole moves forward and backward by activating the mold advancing / retracting device so as to penetrate the hot metal dam formwork attached to the gutter mold in the gutter longitudinal direction. .
The molten metal weir frame is located in the skinmer portion that separates the molten iron and the slag. That is, the mold advance / retreat device is activated to move the residual pigeon hole formwork to the lower part of the hot metal weir formwork, and the amorphous metal refractory is poured into the hot metal weir formwork. This is dried and solidified, and then the mold advancing / retreating device is activated to retract the residual iron hole forming frame from within the molten metal weir forming frame. It is easily molded. Therefore, in the operation of opening the residual iron hole, the heavy work of the worker and the work in the bad environment are eliminated.

Further, the mold for the residual tapping hole is formed of an airtight flexible material, and the gas is supplied and discharged from the gas supply / exhaust means to the inside thereof, thereby forming a flexible mold for the residual tapping hole. It is configured to be scaled. That is, when the mold for the residual tapping hole is advanced and arranged in the lower part inside the mold for the molten iron weir, the gas feed / discharge means expands the flexible mold for the residual tapping hole.
Further, when the mold for the residual pig iron hole is retracted from the inside of the mold for the molten iron weir, the flexible mold for the residual pig iron hole is contracted by the gas supply / discharge means. By expanding and contracting the diameter of the form for the residual tapping hole in this way, the work for extracting the form for the residual tapping hole from the inside of the form for the molten iron weir filled with refractory becomes extremely easy. .

Alternatively, if the form of the above-mentioned residual iron vent hole frame is formed by a pipe body whose surface is coated with a lubricant, the form of the molten metal weir form filled with the refractory material is caused by the action of the lubricant. The mold for the residual pig iron hole can be easily extracted.

On the other hand, according to the construction of the above-mentioned method for forming a residual iron drainage hole for a molten metal gutter, when an amorphous refractory is poured between the molten metal gutter and the gutter form, an inner refractory wall is formed. First, a cylindrical residual iron hole forming mold is arranged in the lower portion inside the molten metal weir forming mold located in the skinmer part of the gutter forming mold. Since the mold for the residual pig iron hole is arranged so as to penetrate the mold for the molten iron weir in the longitudinal direction of the gutter, the through hole is formed in advance in the mold for the molten iron weir. Next, pour the irregular-shaped refractory into the molten iron weir mold in which the residual iron drainage hole mold is placed,
This is dried and solidified. After that, the residual iron hole forming frame is extracted from the molten iron dam forming frame filled with the refractory material, and the residual iron hole is formed in the molten iron weir. In this way, when pouring the irregular-shaped refractory, the residual iron vent hole is formed at the same time, so that the work of opening the hole by the punching machine is eliminated, and the labor of the worker and the work under adverse environment are eliminated. become.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the apparatus for forming a residual iron hole in a gutter for molten metal and the method for forming a residual iron hole according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a perspective view showing an embodiment of the apparatus for forming a residual iron hole in a gutter for molten metal according to the present invention. As shown in the figure, the residual iron hole forming apparatus 10 of the present embodiment is installed in a gutter frame 11. The gutter form 11 is provided inside the tapping gutter 12 when a refractory wall is formed on the inner surface of the blast furnace tapping gutter 12, for example. That is, a U-shaped gutter form 11 is provided inside the tap gutter 12, and an amorphous refractory 13 is poured between the tap gutter 12 and the gutter form 11 to dry and solidify it. To form an inner refractory wall.

A skinmer portion 14 for separating the hot metal and the molten metal is located on the upstream side of the gutter of the gutter frame 11.
On the bottom surface, a molten metal weir frame 16 for molding the molten iron weir 15 is attached integrally with the gutter mold 11. At the lower part inside the mold 16 for the hot metal weir, a cylindrical frame 17 for the residual iron extraction hole is configured to advance and retract so as to penetrate the mold 16 in the longitudinal direction of the gutter. Therefore, a through hole 16a is formed along the longitudinal direction of the gutter so that the mold 16 for the hot metal weir can pass through the mold 17 for the residual tapping hole.

The mold 17 for the residual iron hole is constructed as shown in FIG. As shown in the figure, the mold 17 for the residual iron vent hole is formed of a cylindrical airtight flexible material whose tip is closed. As the airtight flexible material, for example, rubber or vinyl is adopted, but rubber is particularly suitable because it has elasticity.

Further, a gas supply / discharge means 18 for supplying / discharging and expanding / contracting gas to / from this is provided inside the flexible residual iron extraction hole frame 17. The gas supply / discharge means 18 is
A plurality of pores 1 mounted inside the mold 17 for the residual iron hole
Supply / discharge pipe 18b having 8a and supply / discharge pipe 18b
The gas transfer tube 18c is connected to the gas transfer tube 18c and a supply / discharge pump (not shown) connected to the gas transfer tube 18c.

Further, the base end of the supply / discharge pipe 18a is welded and fixed to the tip of the intermediate rod 19, and the base end of the intermediate rod 19 is closed. The gas transfer tube 18b is inserted into the intermediate rod 19. Then, on the outer peripheral portion on the tip end side of the intermediate rod 19,
The base end portion of the residual pig iron hole frame 17 is fixed by its elastic force.

Further, at the base end portion of the intermediate rod 19,
A mold advancing / retracting device 20 for advancing / retracting the mold 17 for the residual pig iron hole fixed thereto is connected. The mold advance / retreat device 20 is composed of a cylinder device supported by the gutter form 11. That is, the intermediate rod 19
The tip end of the piston rod 20a of the cylinder device 20 is connected to the base end of the. Furthermore, the mold 1 for the residual iron hole
Since the intermediate rod 19 to which 7 is fixed is moved forward and backward by the cylinder device 20, the intermediate rod 19 is fixed in the guide pipe 21 fixed around the through hole 16a of the molten metal weir frame 16 in order to guide its reciprocating movement. It is inserted and supported.

In the present embodiment, the mold 17 for the residual iron hole is made of a flexible material such as rubber, but the mold 17 for the residual iron hole is formed of a tubular body such as a steel pipe. Alternatively, the surface may be coated with a lubricant. As the lubricant, for example, Teflon is adopted. In this case,
The base end portion of the residual pig iron hole frame 17 is welded and fixed to the tip end portion of the intermediate rod 19, and the gas supply / discharge means 18 is unnecessary.

Next, the operation of the above embodiment will be described with reference to the method for forming a residual tapping hole for a molten metal gutter according to the present invention. In the method for forming a residual iron hole according to the present embodiment, an amorphous refractory material 13 is poured between a blast furnace tap gutter 12 and a gutter mold 11 and is dried and solidified to form an inner refractory wall. used. Therefore, before the gutter form 11 is provided inside the tap gutter 12, the gutter form 11 is equipped with the above-described residual tapping hole forming apparatus 10.

First, the piston rod 20a is advanced from the cylinder device 20 supported and fixed to the gutter frame 11. Then, the intermediate rod 19 connected to the piston rod 20a is guided and advanced in the guide pipe 21, and the residual iron punching hole frame 17 fixed to the intermediate rod 19 is melted at the skinmer portion 14. Formwork 16 for pig iron
It is placed in the inner bottom. The residual pig iron hole mold 17 is inserted into the through hole 16a of the molten iron weir frame 16 so as to penetrate the molten iron weir mold 16 in the gutter longitudinal direction. There is.

Next, from the supply / discharge pump to the gas transfer tube 1
Gas is supplied to the supply / discharge pipe 18b mounted inside the residual pig iron hole frame 17 via 8c. This supply and discharge pipe 1
A plurality of pores 18a are formed in 8b. Therefore, the mold 17 for the residual iron extraction hole, which has a cylindrical shape with a closed end and is formed of a flexible material such as rubber, expands,
The outer diameter will be enlarged.

In this state, the amorphous refractory 13 is poured between the tapping gutter 12 and the gutter mold 11, and at the same time, the irregular refractory 13 is used for the residual iron vent hole mold 17 described above. It is also poured into the molten metal weir mold 16 in which is arranged. And
It is solidified through a required drying process.

After the completion of drying and solidification, the inside of the supply / discharge pipe 18b is exhausted by the supply / discharge pump. Then, the mold 17 for the residual iron hole, which is fixed to the intermediate rod 19 while covering the supply / discharge pipe 18b, contracts, and the outer diameter of the form 17 decreases.

Next, when the piston rod 20a is retracted into the cylinder device 20, the piston rod 20a
The intermediate rod 19 connected to a is guided in the guide pipe 21 and moves backward. As a result, the residual pig iron hole mold 17 is extracted from the molten pig iron mold frame 16 filled with the refractory material, and the residual pig iron hole 15 is formed in the molten pig iron weir 15.

Finally, the form 11 for the gutter is pulled out from the tap gutter 12 to complete the formation of the inner refractory wall.

As described above, when the irregular-shaped refractory material 13 is poured, the residual tapping hole can be formed at the same time, so that the hole-piercing work by the hole-piercing machine is eliminated and the worker does not have to work hard or in a bad environment. The work of can be eliminated. That is, the residual pig iron hole forming apparatus and the residual pig iron hole forming method of the present embodiment, the pre-drilling work of the high hardness refractory in the residual pig iron removal technology by the current residual pig iron hole is omitted, and the residual pig iron is removed. It is possible to achieve efficiency and comfort.

Further, if the form 17 for the residual iron vent hole is formed of a tubular body such as a steel pipe and the surface thereof is coated with a lubricant such as Teflon, the refractory is filled by the lubricity of Teflon. It is possible to easily pull out the residual pig iron hole forming frame 17 from the inside of the molten iron weir forming frame 16 and the residual pig iron hole forming device 10
The structure of can be simplified.

[0036]

As described above, according to the apparatus and method for forming a residual iron hole in a gutter for molten metal according to the present invention, it is possible to eliminate the heavy labor of a worker and the work in a bad environment. Exerts an excellent effect.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of an apparatus for forming a residual iron hole in a gutter for molten metal according to the present invention.

FIG. 2 is a cross-sectional view showing a residual iron hole forming mold adopted in the residual iron hole forming apparatus of the present embodiment.

FIG. 3 is an explanatory view showing a state of separation of hot metal and slag in a skinmer portion of a blast furnace tap pipe.

FIG. 4 is an explanatory diagram showing a state of residual iron discharge by a residual iron vent hole of a blast furnace tap pipe.

[Explanation of symbols]

 11 Gutter formwork 12 Molten metal gutter 13 Unshaped refractory material 16 Hot metal weir formwork 17 Residual pig iron hole formwork 20 Formwork advancing / retracting device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Konobu Matsumoto 46-59 Nakahara, Tobata-ku, Kitakyushu City, Fukuoka Prefecture Nippon Steel Corporation Machinery & Plant Division

Claims (4)

[Claims] 1. A form for a molten metal weir attached to a predetermined position of the form for a gutter, which is provided inside a gutter for molten metal and forms an indefinite refractory on the inner surface thereof. The present invention is characterized by being equipped with a cylindrical residual iron hole forming mold that advances and retreats into the inside of the gutter so as to penetrate in the longitudinal direction, and a frame advancing / retracting device that operates the residual iron hole forming frame. Equipment for forming residual iron holes in molten metal gutters. 2. The mold for the residual iron vent hole is formed of an airtight soft material, and gas supply / discharge means for supplying / discharging gas and expanding / contracting the gas is provided therein. The apparatus for forming a residual iron hole in a gutter for molten metal according to item 1. 3. The apparatus for forming a residual tapping hole for a molten metal gutter according to claim 1, wherein the mold for the residual tapping hole is formed of a tube body whose surface is coated with a lubricant. 4. A gutter form is provided inside a gutter for molten metal, and an unshaped refractory is poured between the gutter and the gutter form to form an inner refractory wall. In the lower part of the mold for the hot metal weir, a cylindrical form for the residual iron vent hole is arranged so as to penetrate through this in the longitudinal direction of the gutter. After the pouring and the drying and solidification of the molten iron are completed, the residual iron hole forming mold is extracted from the hot metal dam forming frame to form the residual iron hole forming holes in the molten metal weir. Method for forming residual iron holes in metal gutters.