JPH0730373B2 - Opening method of opening of molten metal container etc. and energizing plug for opening opening - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a residual metal outlet for a molten metal flow gutter, a method for opening an opening of a tapping outlet of a tilting type metallurgical furnace, and a power plug for opening the opening. It is a thing.

[0002]

2. Description of the Related Art For example, in the tapped gutter of a blast furnace, it is customary that the hot metal remains after the tapping is completed, and when the residual hot metal solidifies, the gutter characteristic of the tapped gutter is impaired. It is necessary to pull out from the tap iron gutter to the outside before the residual slag) solidifies. As shown in FIGS. 3 and 4, there is an opening 5 for tapping the residual hot metal in the side bottom 4 of the tap hot gutter 2 of the blast furnace 1 after the tapping is finished. Although the residual pig iron is accumulated in the pig iron gutter 2, since the opening 5 is filled with the refractory filling material 6, the residual pig iron does not flow out of the tap pig iron gutter 2.

[0003] The work of removing the residual iron starts by installing a punching machine 7 having a filling mechanism in the residual iron gutter 3. When installing the punching machine 7, the punching machine 7 is moved toward the center of the opening 5.
It is important to perform centering so that the drill 8 of FIG. The installation work is near the hot gutter 2 in which the hot metal is accumulated, and it takes time to align the core, so the worker becomes a high heat and heavy labor. Immediately before the tapping from the blast furnace 1 is completed in the large gutter 2, the punching machine 7 is operated to open the filler 6 in the opening 5 by the rotating / pressing force of the drill 8. At that time, the work environment is in a bad state due to dust from crushed powder of the refractory. Simultaneously with the opening, the hot metal in the large gutter 2 is discharged from the opening 5 to the lower end level thereof, and is accommodated in the ladle P through the residual hot metal gutter 3.

However, since the start of hot metal outflow due to the penetration of the tip of the drill 8 at the time of opening cannot be predicted and sudden outflow and scattering may occur, there is a problem in safety. When the amount of molten pig iron outflow becomes small, the filling mechanism of the punching machine 7 is used to
The filling material is filled in the inner hole of the opening 5. After that, the punching machine 7 is moved from the remaining iron gutter 3 to the standby position. In this way, due to high heat, dust, and heavy-duty work, there is also a safety problem, so the frequency of residual iron removal work was also the minimum necessary, and there was a problem in terms of effective utilization of refractories. (Reference technology: JP-A-60-676
06, JP-A-56-16608)

[0005]

DISCLOSURE OF THE INVENTION The present invention provides a method for opening / closing an opening and a current-carrying plug for opening / closing an opening in a molten metal processing apparatus such as a metallurgical furnace and a tap gutter capable of solving various problems in the conventional method. is there.

[0006]

The first invention of the present invention is as follows:
It is possible to insert an energizing plug into an opening of a molten metal container or the like, energize the energizing plug to generate heat in the energizing plug, and to remove the energizing plug by melting the adhered / solidified material around the energizing plug. This is a method for opening an opening of a molten metal container or the like.

A second aspect of the present invention is used to implement the first aspect of the present invention, in which an annular insulating band is provided continuously from the one end face to the other end face of the columnar refractory electric heating element and which is continuous in the circumferential direction.
A molten metal container or the like in which an inner part and an outer part are formed on one end face side with this insulating band as a boundary, one end face of which is connected to a power source through an electrode, and a conduction path is formed between the inner part and the outer part It is an energizing plug for opening an opening.

The third invention is characterized in that, in the second invention, the insulating band is formed by a slit.

The fourth invention is characterized in that the insulating band is formed of an insulating material.

[0010]

In the present invention, molten metal processing container (including metallurgical furnace, gutter, etc.) is used to discharge hot water (slag) or residual hot water (slag).
It is applied when opening an opening for extraction, and an energizing plug made of a refractory energizing heating element is attached to the opening and the energizing plug 10 is used when opening the opening. By energizing and generating heat, heating the peripheral part to melt (or extremely soften) the adhered / solidified material, reduce the withdrawal resistance, and then withdraw this energizing plug,
The opening can be opened in an extremely short time.

When the opening is closed, an energizing plug is inserted into the opening, but this insertion may be performed immediately after tapping hot water or draining residual hot water. In this case, energize the energizing plug to generate heat, and then insert the energizing plug and the solidified deposits into the opening by melting and inserting it, stop energizing, and solidify these deposits as necessary. Depending on the situation, repair the surrounding area. When the opening is opened and hot water or residual hot water is withdrawn and the damage to the opening is large, the energizing plug may be inserted at the same time when the opening is repaired. in this case,
It is not always necessary to energize the energizing plug. The present invention will be described in detail below based on an example (embodiment) applied to the opening of the opening for extracting the residual iron (slag) from the gutter of the blast furnace of the present invention.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, 2 is a tap iron gutter of a blast furnace.
An opening 5 is provided in a side bottom portion 4 of the tap iron gutter 2, a sleeve brick 9 is fitted in the opening 5, and an energization plug 10 is inserted in a hole of the sleeve brick.

As shown in FIGS. 2 and 3, the energizing plug 10 is formed of a carbon-containing refractory material having an energizing and heat-generating property in a columnar shape, and has an annular slit 16 which is concentrically continuous with the axis thereof.
Is provided. The slit 16 is provided from one end surface side to the other end surface side of the energization plug 10, but is provided halfway without penetrating the other end surface, and the slit 16 provides the energization plug 10 with an inner portion 10 ₁ and an outer portion 10 ₀ . The inner portion 10 ₁ and the outer portion 10 ₀ are continuous with each other on the other end side 10 ₂ where the slit 16 is not formed.

The tips of the inner part 10 ₁ and the outer part 10 ₀ are driven by an air cylinder or the like, which is disposed on the casting floor 12 by a driving machine 1.
3 is inserted and held at the tip of a lance 11 provided so as to be able to move back and forth, is incorporated into the tip of the lance 11, and is in contact with electrodes 17 ₁ and 17 ₀ connected to a power source 19, respectively. By energizing the energizing plug 10 via
Power is supplied between the inner portion 10 ₁ and the outer portion 10 ₀ .

In this case, due to the action of the insulating band by the slit 16, the current flows out by bypassing the other (front) end 10 ₂ of the energizing plug 10 and the entire energizing plug 10 generates heat, and the adhesion and solidification of the peripheral part thereof. The temperature can be uniformly raised to such an extent that the material can be melted. The lance 11 having a holding mechanism for the energizing plug 10 can be moved forward and backward by a mechanism for moving the lance 11 forward and backward provided in the drive machine 13, and can be moved up and down.
Is also equipped with a compressed air and power supply control device for operating these mechanisms. Then, the compressed air required by the operation of the control board 15 is supplied from the compressor 18 to the driving machine 13 by the electric power from the power source 19 through the duct 14 disposed under the casting floor 12, and the tapping tap gutter by the energizing plug 10 is supplied. The opening work of the second opening is performed.

When the remaining pig iron L in the tapping gutter 2 is to be extracted, the energizing plug 10 is energized in the state shown in FIG. 1 to heat the energizing plug 10 and the attached and solidified pig iron around the energizing plug 10. Also, the adhered and solidified substances such as slag are put into a molten state. The energizing plug 10 is supported by a driving machine 13 via a lance 11 so as not to come off due to the static pressure of the hot metal during tapping, but after the tapping is finished, pig iron and slag adhere to the tip and the outer peripheral part of the energizing plug 10. -Since it has solidified, pulling resistance is large until then, and smooth pulling is difficult. By melting these adhered and solidified substances, the pull-out resistance of the current-carrying plug is reduced, and the pull-out is facilitated.

In this state, the advance / retreat mechanism of the lance 11 of the driving machine 13 is operated to retract the lance 11,
The energizing plug 10 is pulled out from the tap iron gutter 2, the opening 5 is opened, the residual iron L in the tap iron gutter 2 is discharged, and it is stored in the ladle P under the casting floor 12 through the residual iron gutter. After pulling out the power plug 10, the power supply is stopped. After the extraction of the residual iron is completed, the advance / retreat mechanism of the driving machine 13 is operated to move the lance 11 forward to insert the energization plug 10 into the sleeve brick 9.

In this case, since the adhered and solidified matter is present inside the sleeve brick 9 and on the outer peripheral surface of the energizing plug 10, it may interfere with the insertion of the energizing plug 10. In such a case, the energizing plug 10 is energized. Then, heat is generated to make these adhered and solidified substances in a molten state, and the energizing plug 10 is inserted.
The energization may be stopped to re-solidify the molten material, or the state of the adhered / solidified material should be prevented from forming a gap between the energizing plug 10 and the sleeve brick 9 at the time of tapping, depending on the situation such as the worn state of the sleeve brick. Alternatively, the power plug 10 may be inserted after the refractory mortar or the like is used or the sleeve brick 9 is replaced. The energization plug 10 may be worn, and if the degree of wear is great, the energization plug 10 is also replaced.

In this way, by using the current-carrying plug 10 to insert it into the opening, and by energizing the current-carrying plug to pull it out, the opening can be smoothly and easily opened. It has an advantage that it can be performed in an extremely short time without damaging the working environment.

The present embodiment is applied for removing the residual iron from the tapping gutter 2 of the blast furnace. For example, tapping of a metallurgical furnace such as a taphole of the blast furnace (in particular, a tilting metallurgical furnace). (Debris)
It can also be applied to open and close the mouth opening, etc.,
The driving machine 13 may be mobile. The insulating band of the energizing plug 10 may be formed of an insulating material such as a non-conductive refractory material (general refractory material, heat insulating material, etc.) instead of the slit.

In the present invention, as shown in Table 1, the time required for the residual iron removal work and the number of personnel can be reduced as compared with the above-mentioned conventional example, and as a result, the frequency of the residual iron removal increases, so that the gutter-lined fire resistance can be increased. Since it is possible to easily observe and grasp the melted state of the refractory, and to effectively utilize the refractory, it is possible to significantly reduce the refractory cost.

[0022]

[Table 1]

[0023]

According to the present invention, the following effects can be obtained. (1) Eliminates heavy labor in high temperature and dust environments,
Easier to remove residual iron. In addition, it was possible to reduce the number of workers. (2) By increasing the frequency of residual iron removal by (1),
It is possible to easily observe and understand the melted state of the gutter-lined refractory, and to effectively use the refractory, so the refractory cost can be significantly reduced.

[Brief description of drawings]

FIG. 1 (a) is an external view of a work situation of removing residual iron from a blast furnace gutter according to the present invention. (B) It is an external view of the work situation of residual iron removal from a blast furnace gutter in the present invention.

FIG. 2 is a structural diagram of an energization plug according to the present invention.

FIG. 3 is a cross-sectional view taken along the line II ′ of the current-carrying plug of FIG.

FIG. 4 is a plan layout view of a blast furnace, a tap iron gutter, a residual iron gutter, and a ladle.

FIG. 5 is an external view of a conventional work of removing residual iron from a blast furnace gutter.

[Explanation of symbols]

 1 Blast Furnace 2 Detached Iron Gutter 3 Remaining Iron Gutter 4 Side Bottom 5 Opening 6 Filling Material 7 Drilling Machine 8 Drill 9 Sleeve Brick 10 Power Plug 11 Lance 12 Cast Bed 13 Drive Machine 14 Duct 15 Control Panel 16 Slit 17 Electrode 18 Compressor Power supply L Hot metal P Ladle

Claims (4)

[Claims] 1. An energizing plug is attached to an opening of a molten metal container or the like, and the energizing plug is energized to heat the energizing plug to melt the adhered / solidified material around the energizing plug. A method for opening an opening of a molten metal container or the like, which is characterized by pulling out. 2. A columnar refractory energization heating element is provided with an annular insulating band which does not penetrate from one end surface to the other end surface and which is continuous in the circumferential direction, and an inner portion and an outer portion are provided on one end surface side with this insulating band as a boundary. Formed, connect one end face to the power supply through the electrode,
An energizing plug for opening an opening of a molten metal container or the like formed by forming an energizing path between the inner part and the outer part. 3. The energizing plug for opening an opening of a container such as a molten metal according to claim 2, wherein the insulating band is formed by a slit. 4. The energizing plug for opening an opening of a molten metal container or the like according to claim 2, wherein the insulating band is formed of an insulating material.