JPH06201274A - Device and method for disintegrating residual iron in large trough of blast furnace - Google Patents

Abstract

PURPOSE:To efficiently disintegrate residual iron in a large trough while dusts are prevented from being generated by forming grooves at specific intervals in the width direction of a large trough, separating residual iron pieces from the large trough, and discharging the separated residual iron pieces. CONSTITUTION:A traveling motor 7 of a truck 6 is actuated to move a device for disintegrating residual iron in a large trough of blast furnace to a point where the forward end of a residual iron in a large trough 1 is located. Grooves 4 are formed on the residual iron 2 in the width direction of the trough 1, at specific intervals in a longitudinal direction of the trough 1. The device inserts a point of an impact ripper 8 into the forward end of the iron 2 or into the goove 4 formed nearest the forward end of the iron 2 and actuats a breaker and an arm as well to separate the iron piece 2 at the forward end of the iron divided by the grooves 4 from an amorphous refractory material, further from an adjoining residual iron piece 2. A lifting magnet 13 is charged with drive current so that the piece 2 is sucked and discharged out of the trough 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blast furnace large gutter residual iron dismantling device and a blast furnace large gutter residual iron disassembling apparatus for disassembling a residual iron mass remaining on an irregular shaped refractory on the inner surface of a large gutter flowing with pig iron discharged from a tap hole of a blast furnace Remaining iron dismantling method.

[0002]

2. Description of the Related Art A blast furnace gutter usually has a length of about 20 m, and hot iron molten slag discharged from the blast furnace at a high temperature is flowed into the gutter and the inside of the gutter installed inside the gutter. Local refractory is subject to local wear due to pig iron or slag, chemical deterioration, and local deterioration due to repeated heating and cooling due to switching of tapping gutter, etc., and residual iron remains on the irregular refractory. . Therefore, in general, 1 per gutter
About once or twice a month, it is necessary to dismantle the gutter and hot repair the irregular refractory.

Conventionally, the dismantling work of this gutter has been performed as shown in FIGS. 5 and 6. That is, first, FIG.
As shown in FIG. 3, a steel plate 51 is installed on the gutter 50, and a backhoe 52 is installed on the steel plate 51. A breaker 53 is attached to the tip of the backhoe 52, and by operation of an operator, the residual iron ingot remaining on the irregular refractory 54 on the inner surface of the gutter 50 and the deteriorated surface portion of the irregular refractory 54 are averaged 100 mm in thickness. Crush up to about 250 mm. The debris dismantled in this way is returned to the backhoe 52 as shown in FIG.
Replace the breaker 53 of the excavator 55 with the shovel 5
The scrap is scraped out at 5, and is discharged at the bucket 56.

However, the conventional dismantling work of the Ohiga,
Since the work is right above the gutter, it is a work in a high temperature atmosphere due to the residual heat of the gutter, and because it is dismantled using the breaker 53, not only considerable vibration and noise are generated, but also crushing. During this process, dust is generated, and the work is performed in a bad environment. In particular, residual iron has a maximum thickness of 150 mm (generally,
100 mm to 50 mm), the maximum width is 1000 mm, and it has a toughness as compared with the amorphous refractory, so the efficiency of dismantling is poor and it greatly affects the efficiency of the entire dismantling work of Ohiga. The conventional dismantling work of the Ohiga like this usually takes one day and requires six working personnel.

Therefore, conventionally, in order to improve the efficiency and work environment of dismantling a large gutter, a gutter repair device for a pig iron disclosed in Japanese Patent Publication No. 61-2722 and Japanese Patent Publication No. 59-43703 is devised. Has been done. In this tapping gutter repair device, the residual iron of the tapping gutter is cut into a predetermined shape by the residual iron cutting means, and the cut pieces are adsorbed and conveyed by magnetic force by the adsorbing and conveying means. Further, the chipping and excavation on the gutter wall surface are crushed by the crushing means, and the chippings and excavated pieces are discharged by the vacuum discharging means. Then, a cutter lance is used as the residual iron cutting means, and a lifting magnet is used as the adsorption transportation means. Further, as the crushing means, an air breaker attached via a pressing air cylinder is used, and it is attached to the tip of a transfer boom composed of a combination of a hydraulic cylinder and a lever.

[0006]

However, in such a conventional blast furnace large gutter residual iron dismantling apparatus as described above, a cutter lance is used to cut the residual iron of the large gutter, and when the residual iron is cut, it is adsorbed and conveyed by a lifting magnet. Therefore, there is a problem in improving the work efficiency of the Ohi residual iron dismantling work, and there is a problem in that the work is difficult.

That is, with the cutter lance, the cutting speed of the residual iron is slow, and the work efficiency of the residual iron dismantling work cannot be sufficiently improved. Also, when cutting the residual iron with a cutter lance, the molten metal at the time of cutting remains in the cutting groove, and the residual iron cannot be completely cut, and the adhesive strength between the residual iron and the unshaped refractory of the gutter is high. There was a problem that it was not possible to adsorb and carry by the lifting magnet just by cutting with the cutter lance, and it was difficult to dismantle the residual iron. Further, since the gutter wall is chipped or excavated by the air breaker attached via the pressing air cylinder, a considerable force is required to press the air breaker, which causes a problem of increasing the size of the device.

The present invention has been made in view of the above problems, and an object thereof is to form a groove on a residual iron at a predetermined interval in the width direction of a gutter by powder cutting or the like, and to provide an impact ripper or the like in the groove. By pushing in, peeling off the residual iron pieces from the gutter, and discharging the peeled residual iron pieces, the residual iron of the gutter is efficiently dismantled, while suppressing the generation of dust, etc. By automating, freeing workers from dismantling work under high temperature and dust environment, improving work environment,
It is to save labor, shorten working time, and downsize the device.

[0009]

According to the blast furnace large gutter residual iron dismantling apparatus according to the present invention, the above object is, as described in claim 1, a large gutter in which pig iron tapped from a tap hole of a blast furnace flows. A blast furnace large gutter residual iron dismantling device for dismantling the residual iron ingot remaining on the irregular shaped refractory on the inner surface of the large gutter of the large gutter at predetermined intervals in the longitudinal direction of the large gutter. Groove processing means for forming a cutting groove or a groove of a predetermined depth in the width direction, and a tip of the groove is formed in the groove formed by the groove processing means, and the residual iron ingot is divided into a predetermined size by the groove. Peeling means for peeling from the unshaped refractory of the Ohiga,
It is achieved by providing. In this case, for example, as described in claim 3, the groove processing means and the peeling means may be mounted on a traveling body traveling along the gutter.

Further, as described in claim 2, the blast furnace large gutter residual iron dismantling for disassembling the residual iron mass remaining on the irregular refractory on the inner surface of the large gutter flowing pig iron discharged from the tap hole of the blast furnace An apparatus, comprising: groove processing means for forming cutting grooves or grooves having a predetermined depth in the width direction of the gutter at predetermined intervals in the residual iron ingot in the gutter, and the groove processing. The tip portion is inserted into the groove formed by the means, and the peeling means for peeling off the residual iron ingot classified into a predetermined size by the groove from the unshaped refractory of the gutter and the residue peeled by the peeling means. And an ejecting means for adsorbing and ejecting the iron ingot. In this case, for example, as described in claim 4, the traveling body traveling along the gutter may be equipped with the groove processing means, the peeling means, and the discharging means.

Further, in each of the above cases, the groove processing means is
For example, as described in claim 5, a powder cutting device may be used, and the peeling means may be an impact ripper, for example, as described in claim 6. Further, for example, the discharging means may be a means for sucking and discharging the residual iron ingot by a lifting magnet as described in claim 7.

According to the repairing method of the present invention, the above-mentioned object remains on the amorphous refractory material on the inner surface of the large gutter in which the pig iron flowing from the tap hole of the blast furnace flows, as described in claim 8. A blast furnace Ohi residual iron dismantling method for dismantling a residual iron ingot,
A cutting groove or a groove having a predetermined depth is formed in the residual iron ingot in the gutter at predetermined intervals in the longitudinal direction of the gutter in the width direction of the gutter, and the tip of the peeling means is formed in the formed groove. It is achieved by inserting and peeling the residual iron ingot, which is divided into a predetermined size by the groove, from the unshaped refractory of the gutter.

Further, as described in claim 9, the blast furnace large gutter residual iron dismantling for disassembling the residual iron mass remaining on the irregular shaped refractory on the inner surface of the large gutter flowing pig iron discharged from the tap hole of the blast furnace A method of forming a cutting groove or a groove having a predetermined depth in the width direction of the gutter at predetermined intervals in the residual iron ingot in the gutter and peeling the formed groove. By inserting the tip of the means, peeling off the residual iron ingot classified into a predetermined size by the groove from the unshaped refractory of the gutter, and then adsorbing and ejecting the peeled residual iron ingot. To be achieved.

[0014]

According to the above construction, the residual iron mass remaining on the unshaped refractory on the inner surface of the large gutter flowing with the pig iron tapped from the tap hole of the blast furnace is treated by the groove cutting means such as a powder cutting device. A cutting groove or a groove having a predetermined depth is formed in the width direction of the gutter at predetermined intervals with respect to the longitudinal direction of the gutter, and the tip of the peeling means such as an impact ripper is inserted into the formed groove, The residual iron ingots, which are divided into a predetermined size, are peeled off from the unshaped refractory of Ohiga. Further, the peeled residual iron ingot is discharged by a discharging means such as a lifting magnet. Therefore, it is possible to dismantle the residual iron of the Ohigai efficiently and while suppressing the generation of dust and the like, and also by automating this dismantling work, it is possible to remove workers from the dismantling work under high temperature and dust environment. It can be opened. As a result, it is possible to improve the working environment, save labor, shorten the working time, and downsize the device.

Further, the traveling body traveling along the gutter carries the above-mentioned means and carries out the dismantling work of the residual iron ingot inside the gutter while traveling along the gutter. Therefore, it is possible to further reduce the work staff and improve the work efficiency.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The examples described below are preferred specific examples of the present invention, and therefore, various technically preferable limitations are given, but the scope of the present invention particularly limits the present invention in the following description. Unless otherwise stated, the present invention is not limited to these modes. 1 to 4 are views showing an embodiment of a blast furnace large gutter residual iron dismantling apparatus and a blast furnace large gutter residual iron dismantling method of the present invention, and FIG. 1 is a top view of the large gutter, FIG.
FIG. 3 is a side view of the blast furnace large gutter residual iron dismantling device, FIG. 3 is a front view of the blast furnace large gutter residual iron dismantling device, and FIG. 4 is a diagram showing a state in which residual iron having grooves is peeled off by an impact ripper.

As shown in FIG. 1, in the large gutter 1, fireproof bricks are stacked on the inside of a metal article, and an amorphous refractory article containing, for example, alumina and silicon carbide as a main component is provided on the inside of the fireproof brick. It is shaped like a gutter. The large gutter 1 usually has a length of about 20 M, and pig iron or slag melted at a high temperature tapped from the blast furnace is poured into the large gutter 1. Therefore, the irregular refractory on the inner surface of the gutter 1 may have local abrasion due to pig iron or slag, chemical deterioration, and local deterioration due to repeated heating and cooling due to switching of tapholes. Iron 2 remains in the situation. Therefore, the large gutter 1 needs to be disassembled and repaired once or twice a month.

For the dismantling work of the large gutter 1, a blast furnace large gutter residual iron dismantling device equipped with a powder cutting device as a groove processing means, an impact ripper as a peeling means, and a lifting magnet device as a discharging means is used. The residual iron disassembling apparatus includes, for example, a traveling body such as a caterpillar and travels along the gutter 1 while sequentially performing groove processing by a powder cutting device, peeling processing by an impact ripper, and discharge processing by a lifting magnet device. Note that this dismantling work involves not only working on the gutter installed in the tap hole of the blast furnace online, but also performing it off-line at the repair plant.

2 and 3 show a state in which a groove 4 is formed in the residual iron 2 in the large gutter 1 by the torch 3 of this powder cutting device. As this powder cutting device, a normal powder cutting device is used. The device is in use. The powder cutting device supplies, for example, a preheated mixed gas composed of a combustible gas and oxygen to the torch 3 with a powder obtained by mixing cutting oxygen with iron or the like as a powder,
The torch 3 mixes the preheated mixed gas and this powder to cut the residual iron 2. The blast furnace large gutter residual iron dismantling device holds a torch 3 movably in the width direction of the large gutter 1 and moves the torch 3 in the width direction of the large gutter 1 to remove the residual iron as shown in FIGS. 1 and 4. A groove 4 is formed on the gutter 2 in the width direction of the gutter 1.

Further, traveling rails 5 are provided in parallel so as to sandwich the large gutter 1. The trolley 6 on which the blast furnace large gutter residual iron dismantling device is mounted can travel on the traveling rail 5 by the driving force of the traveling motor 7 so as to straddle the large gutter 1. The blast furnace large gutter residual iron dismantling device moves in the longitudinal direction of the large gutter 1 while the torch 3 of this powder cutting device moves the residual iron 2
The grooves 4 are sequentially formed at predetermined intervals in the longitudinal direction of the gutter 1. The groove 4 may be a cutting groove for cutting the residual iron 2 or may be a groove having a depth such that it can be easily peeled by a peeling process described later. By using this powder cutting device, the residual iron 2 can be processed into the groove 4 having a depth of 50 to 100 mm at a speed of 1.5 to 2.5 m / min.

In addition to the impact ripper 8 provided at the tip of the carriage 6, a traverse rail 9 is provided above the carriage 6 in a direction orthogonal to the traveling rail 5 and traverses on the traverse rail 9. A support cart 12 that supports a powder cutting device 11 that can travel with the driving force of a motor 10 is mounted. A lifting magnet 13 is attached to the rear end of the carriage 6 to the blast furnace large gutter residual iron dismantling device via a drive arm or a wire. The powder cutting device 11 is provided with a torch 3 whose tip is located directly above the residual iron 2 in the gutter 1.

FIG. 4 shows a state in which the residual iron 2 having the groove 4 formed by the groove forming process is peeled off by the impact ripper 8. The impact ripper 8 reciprocates the breaker 15 attached to the bracket 14,
A striking force is continuously applied to the shank 16, and this striking force is transmitted to the point 17 attached to the shank 16. The impact ripper 8 is attached to an arm or the like that is hydraulically driven in the blast furnace large gutter residual iron dismantling device.
4 is inserted into the groove 4 as shown in FIG. 4 to remove the residual iron 2.

The discharging process is performed by the lifting magnet 13 as shown in FIG. The lifting magnet 13 is attached to the blast furnace large gutter residual iron dismantling device via a drive arm or a wire, etc. By driving the drive arm or the like, the lifting magnet 13 is moved to the peeled residual iron piece 2, and the lifting magnet 13 is lifted. It is discharged by being attracted by the magnet 13. The blast furnace large gutter residual iron dismantling device may be driven by automatic control or by remote control.

That is, in the case of automatic control, a monitoring device for monitoring the traveling of the blast furnace large gutter residual iron dismantling device, a measuring device for measuring the shape of the residual iron 2 in the large gutter 1, and a blast furnace large gutter residual iron dismantling device. Based on the monitoring result of this monitoring device and the measurement result of the measuring device, the control device automatically controls the drive of the traveling body such as the caterpillar and makes the powder cutting work. The drive of the device 11, the impact ripper 8 and the lifting magnet 13 is automatically controlled to form the groove 4 in the residual iron 2, peel off the residual iron 2 and discharge the residual iron piece 2.

In the case of remote control, a monitoring device for monitoring the traveling of the traveling body and a measuring device for measuring the residual iron 2 in the gutter 1 may be installed in the blast furnace gutter residual iron dismantling device itself, or in the blast furnace gutter residual grate. Monitor the traveling of the traveling body at a position away from the iron dismantling device, install a monitoring device and a measuring device at a position where the residual iron 2 in the gutter 1 can be measured, and receive a remote control signal from the blast furnace Ohi residual iron dismantling device. By installing a control device for controlling the traveling of the traveling body and the driving of the powder cutting device 11, the impact ripper 8 and the lifting magnet 13, the remote control can be performed at a position away from the Ohiga 1 depending on the monitoring result of the monitoring device and the measurement result of the measuring device. Manipulate.

Next, the operation will be described. In the blast furnace large gutter residual iron dismantling device, a carriage 6 is made to travel on a traveling rail 5 along the large gutter 1, and the powder cutting device 11, the impact ripper 8 and the lifting magnet 13 mounted on the carriage 6 are mounted.
Using, the dismantling work of the residual iron 2 in the Ohi 1 is performed. That is, in order to dismantle the gutter 1, first, the carriage 6
The traveling motor 7 is driven to move the blast furnace large gutter residual iron dismantling device until the tip of the residual iron 2 in the large gutter 1 is positioned.

Next, the torch 3 of the powder cutting device 11 is set at a position of a predetermined length in the longitudinal direction of the large gutter 1 from the tip of the residual iron 2, and the groove 4 is formed in the residual iron 2 in the width direction of the large gutter 1. The groove 4 is formed so as to cross the remaining iron 2 from end to end in the width direction of the gutter 1. This groove forming process is carried out at predetermined intervals while moving the blast furnace large gutter residual iron dismantling device in the longitudinal direction of the large gutter 1, and as shown in FIG. Then, the groove 4 in the width direction of the gutter 1 is formed. After performing the groove forming process over the entire length of the residual iron 2, next, a traveling body such as a caterpillar is driven to move the blast furnace large gutter residual iron dismantling device to a position near the initial position where the groove forming process is started, and the peeling process is performed. Start.

The peeling process is performed using the impact ripper 8. That is, the blast furnace large gutter residual iron dismantling device drives the arm holding the impact ripper 8 to insert the point 17 of the impact ripper 8 into the tip portion of the residual iron 2 or the groove 4 formed closest to the tip portion. Then, the breaker 15 is driven and the arm is driven to peel off the residual iron piece 2 at the tip end sectioned by the groove 4 from the amorphous refractory of the gutter 1. Separate from the iron piece 2.

This peeling treatment is carried out for each groove 4 while the blast furnace large gutter residual iron dismantling device is moved in the longitudinal direction of the large gutter 1 to sequentially peel and separate the residual iron pieces 2. When this peeling process is performed over the entire length of the residual iron 2, next, a traveling body such as a caterpillar is driven again to move the blast furnace large gutter residual iron dismantling device to a position near the initial position where the groove forming process is started, and the discharging is performed. Start processing.

The discharging process is performed by the lifting magnet 13
Using. That is, a driving arm or the like holding the lifting magnet 13 is driven to move onto the residual iron piece 2 at the tip of the residual iron 2, and the lifting magnet 13 is moved.
A driving current is applied to the residual iron pieces 2 to be adsorbed. The adsorbed residual iron pieces 2 are transferred to a basket or the like and discharged to the outside of the gutter 1. This discharging process is sequentially performed from the residual iron piece 2 at the tip while the blast furnace large gutter residual iron dismantling device is moved in the longitudinal direction of the large gutter 1.

As explained above, the torch 3 of the powder cutting device 11 is used to remove the residual iron 2 remaining on the amorphous refractory on the inner surface of the gutter 1 at predetermined intervals in the longitudinal direction of the gutter 1. A groove 4 is formed in the width direction of the wrench, and a point 17 at the tip of the impact ripper 8 is inserted into the groove 4 so that the residual iron piece 2 divided into a predetermined size by the groove 4
Can be peeled off from the irregular-shaped refractory of the Ohi 1. The peeled residual iron piece 2 can be discharged by the lifting magnet 13.

Therefore, the remaining iron 2 of the Ohi 1 can be efficiently
And it can be dismantled while suppressing the generation of dust etc.,
Further, this dismantling work can be automated to free the worker from the dismantling work under a high temperature and dust environment. As a result, the working environment for dismantling the residual iron 2 of the gutter 1 can be improved, the labor can be saved, the working time can be shortened, and the blast furnace large gutter residual iron dismantling device can be downsized.

Further, by mounting the above-mentioned devices on a traveling body such as a caterpillar in the large gutter 1, it is possible to perform the dismantling work of the residual iron 2 in the large gutter 1 while traveling along the large gutter 1. The number of personnel can be reduced and the work efficiency can be improved.

[0034]

As described above, the residual iron in the gutter can be dismantled efficiently while suppressing the generation of dust and the like, and the dismantling work can be automated to obtain high temperature and dust environment. Workers can be released from the dismantling work below. As a result, the working environment can be improved, the labor can be saved, the working time can be shortened, and the device can be downsized.

Further, the traveling body traveling along the gutter can carry out the dismantling work of the residual iron ingot inside the gutter while traveling along the gutter by mounting the above equipments. Can be reduced and work efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a top view of a large gutter.

FIG. 2 is a side view of a blast furnace large gutter residual iron dismantling apparatus according to the present invention.

FIG. 3 is a front view of a blast furnace large gutter residual iron dismantling apparatus according to the present invention.

FIG. 4 is a side view showing a state where a grooved residual iron is peeled off by an impact ripper in the residual iron peeling treatment according to the present invention.

FIG. 5 is a perspective view of a disassembly device using a conventional breaker.

FIG. 6 is a perspective view of a disassembly device using a conventional shovel.

[Explanation of symbols]

 1 Ohi 2 Remaining iron 3 Torch 4 Groove 8 Impact ripper 13 Lifting magnet 17 points

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takao Matsumoto 1-1-1 Wadazaki-cho, Hyogo-ku, Kobe-shi, Hyogo Mitsubishi Heavy Industries Ltd. Kobe Shipyard (72) Ryoji Hayashi Wadazaki, Hyogo-ku, Kobe-shi, Hyogo 1-1-1 Machi Mitsubishi Heavy Industries, Ltd. Kobe Shipyard

Claims (9)

[Claims] 1. A blast furnace large gutter residual iron dismantling device for disassembling a residual iron ingot remaining on an irregular shaped refractory on the inner surface of a large gutter in which pig iron flowing from a tap hole of a blast furnace flows, comprising: Groove processing means for forming a cutting groove or a groove having a predetermined depth in the width direction of the gutter at predetermined intervals in the residual iron ingot in the longitudinal direction of the gutter, and the tip of the groove formed by the groove processing means. A blast furnace large gutter residual iron dismantling device, comprising: a stripping means for stripping a residual iron ingot into which a portion is inserted and divided into a predetermined size by the groove from an unshaped refractory of the large gutter. 2. A blast furnace large gutter residual iron dismantling device for disassembling a residual iron ingot remaining on an irregular shaped refractory on the inner surface of a large gutter in which pig iron flows from a tap hole of a blast furnace. Groove processing means for forming a cutting groove or a groove having a predetermined depth in the width direction of the gutter at predetermined intervals in the residual iron ingot in the longitudinal direction of the gutter, and the tip of the groove formed by the groove processing means. Part is inserted, and a peeling means for peeling the residual iron ingot classified into a predetermined size by the groove from the unshaped refractory of the gutter, and a discharge for adsorbing and ejecting the residual iron ingot peeled by the peeling means A blast furnace large gutter residual iron dismantling device comprising: 3. The blast furnace large gutter residual iron dismantling device according to claim 1, wherein the groove processing means and the peeling means are mounted on a traveling body that travels along the large gutter. 4. The blast furnace large gutter residual iron dismantling device according to claim 2, wherein the groove processing means, the peeling means, and the discharging means are mounted on a traveling body that travels along the large gutter. 5. The blast furnace large gutter residual iron dismantling device according to claim 1, wherein the groove processing means is a powder cutting device. 6. The blast furnace large gutter residual iron dismantling apparatus according to claim 1, wherein the peeling means is an impact ripper. 7. The blast furnace large gutter residual iron dismantling device according to claim 1, wherein the discharging means adsorbs and discharges the residual iron ingot by a lifting magnet. 8. A blast furnace large gutter residual iron dismantling method for disassembling a residual iron ingot remaining on an irregular shaped refractory on the inner surface of a large gutter flowing pig iron discharged from a tap hole of a blast furnace, comprising: A cutting groove or a groove having a predetermined depth is formed in the residual iron ingot in the width direction of the large gutter at predetermined intervals with respect to the longitudinal direction of the large gutter, and the tip portion of the peeling means is inserted into the formed groove, A blast furnace large gutter residual iron dismantling method, characterized in that a residual iron ingot classified into a predetermined size by the groove is peeled off from the unshaped refractory of the large gutter. 9. A blast furnace large gutter residual iron dismantling method for disassembling a residual iron mass remaining on an irregular shaped refractory on the inner surface of a large gutter flowing pig iron discharged from a tap hole of a blast furnace, comprising: A cutting groove or a groove having a predetermined depth is formed in the residual iron ingot in the width direction of the large gutter at predetermined intervals with respect to the longitudinal direction of the large gutter, and the tip portion of the peeling means is inserted into the formed groove, A blast furnace large gutter residual iron dismantling method, characterized in that a residual iron ingot classified into a predetermined size by the groove is peeled off from the irregular shaped refractory of the gutter, and then the peeled residual iron ingot is adsorbed and discharged. .