JPH0422962B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method for receiving hot metal remaining at the bottom of a blast furnace during blowdown of a blast furnace.

``Prior Art'' As shown in Fig. 1, the refractories at the bottom of the blast furnace are eroded by hot metal, etc., and a puddle 1a is formed in the hearth. ) will remain in the amount of several hundred tons.

When blowing down a blast furnace, it is necessary to discharge several hundred tons of residual pig iron, but since the level of residual pig iron is below the tap hole normally used, a temporary tap hole is required for this work. Installing a furnace bottom (furnace wall), pouring the residual pig iron into the dryvit (cooling area) from this temporary tap hole through a trough and allowing it to cool naturally, and then crushing it requires hard labor and requires a long period of time for blast furnace renovation work. had a great influence on.

``Problems to be solved by the invention'' The conventional method of solidifying iron in a tripit and mechanically pulverizing it requires a different amount of work than the method of continuously casting into appropriate sizes using a surface plate or iron casting machine. There were many problems such as high costs and long construction periods, and it was also uneconomical to provide permanent iron receiving equipment only for blowing off.

Therefore, the inventors proposed a method in which the residual pig iron accumulated at the bottom of the furnace is transferred to a hot metal ladle using a simple device and then cast by a pig iron casting machine, or directly into a mold, thereby solving the above problem. This is what we are trying to solve.

"Means for Solving the Problems" The present invention describes a method for receiving pig iron accumulated at the bottom of a blast furnace into a hot metal ladle and a method for receiving pig iron into a mold.

(1) Method of receiving hot metal into a ladle.

A temporary tap hole is provided in the furnace wall (furnace bottom), and the residual pig iron flows out from the tap hole through the tap hole, and the residual pig iron that flows into the residual pig hole flows out into the crossing hole. This is a method of continuously receiving hot metal into a plurality of hot metal pots by changing the hot metal ladle to which the hot metal is received by manipulating the sluice, as shown in Figure 9. There is a method of receiving the hot metal by changing the direction of inclination and changing the hot metal ladle to receive the pig iron, and a method of changing the hot metal ladle by raising or lowering one end of the transfer gutter as shown in Fig. 4.

(2) Method of receiving pig iron into a mold.

A surface plate mold is used for the mold, and the method for receiving the pig iron is as follows:
A temporary taphole was installed in the furnace wall (furnace bottom), and the residual pig iron flowed out from the taphole into the residual pigtail trough, and multiple surface plate molds were loaded in close contact with each other directly below the trough of the residual pigtail trough. This is a method in which a truck is arranged and the residual pig iron flowing out from the residual pig iron trough is continuously received into a plurality of platen molds while moving the truck, and is mainly suitable when there is little residual pig iron.

"Embodiment" An embodiment of the present invention will be described in detail based on the drawings.

(1) Method of receiving hot metal into a ladle.

A method for receiving hot metal by dividing a plurality of hot metal ladle into group A ladle and group B ladle is shown in FIGS. 1 to 7.

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG.
The figure is a plan view showing an embodiment of the present invention, and FIGS. 3 to 7 are side views showing each step of a method for receiving hot metal into a ladle by raising and lowering one end of a ferry.

In the figure, 1 is the hearth bottom refractory, 1a is the refractory erosion part,
2 is the residual pigtail gutter, and 5 is the ferry gutter.

First, estimate the erosion line of the furnace bottom refractory, and drill a hole (A
side) and install a residual pigtail gutter 2. The hot metal ladle A1 and the hot metal ladle B1 are pulled by the mobile vehicle K1 on the track (#6) laid directly below the gutter of the residual pig iron gutter 2, and the hot metal ladle B1 is placed directly below the gutter of the residual pig iron gutter 2. . After that, a ferry 5 is hung between the hot metal pots A1 and B1. The transfer trough 5 is arranged at a position where the residual pig iron falls from the residual pig iron trough 2. Next, a predetermined amount of residual pig iron is received from the residual pig iron trough 2 into the tapped hot metal ladle B1. Incidentally, the above-mentioned crossing of the transfer trough 5 may be carried out while receiving residual pig iron into the hot metal pot B1.

After receiving a predetermined amount of residual pig iron into the hot metal ladle B1, the hot metal ladle A1 is moved together with the hot metal ladle B1 by the mobile vehicle K1 so that it is directly under the residual pig iron gutter 2.

During this movement, the residual pig iron that is continuously flowing down from the residual pigtail trough 2 travels on the crossing trough 5 and is received by the hot metal ladle A1 or hot metal ladle B1, and does not overflow outside the ladle.

Next, when the hot metal ladle A1 reaches directly below the residual pig iron ladle 2, it is stopped and the hot metal ladle A1 is moved as shown in Figure 4.
While receiving the pig iron, the hot metal ladle B1 side of the transfer sluice 5 is lifted and held by the chain 12.

Hot metal pots A1 and B1 with the ferry suspended
The series of carts 9 is released, and the hot metal ladle B1 is moved to the track (#8) by the mobile car K1 and is kept on standby for being sent to the next process (pig iron casting machine, etc.) as a completed pig iron receiving ladle.

Subsequently, the rail car pulls out the empty hot metal pot B2 from the track (#7) and connects it to the hot metal pot A1 that is receiving pig iron via the track (#6). After the connection is completed, the ferry suspended by the chain 12 is placed on the hot metal ladle B2.

When the loading of the transfer trough is completed, the hot metal ladle B2 is transferred to the residual pig iron trough 2 by the rail car as shown in Fig. 7.
Move it so that it is directly below. During this movement, the residual pig iron flowing down from the residual pigtail trough is poured into the hot metal ladle A1 or the hot metal ladle B2 received by the ferry trough and is received.

In addition, if the amount of residual pig iron is large and the number of hot metal ladle (group B) to be replaced increases and hot metal ladle A1 cannot receive all the pig iron, hot metal ladle A1 is moved to orbit (#8) together with the group B hot metal ladle. and use hot metal pot A2 instead.

In this example, the above operation was repeated and 230 tons of hot metal was received into four hot metal pots. In addition, there was no overflow of residual pig iron from the residual pig iron trough or hot metal pot until the completion of the residual pig iron repair.

(2) Method of directly receiving pig iron into the surface plate mold This method uses a temporary tap hole (A side) that was opened to receive the hot metal into the hot metal pot (A side) to discharge the residual pig iron that could not be discharged from the B side. A new tap hole is opened in the hole, and a residual pig iron trough 3 is installed.

A plurality of carts 8 pulled by a mobile vehicle K2 are placed on the track (#5) laid directly below the gutter of the pig iron residue gutter 3.
Place.

A plurality of surface plate molds are disposed in close contact with each other on the trolley, and above the coupling machine 9 of the carriage 8, the coupling machine 9
A protective iron plate 7 is hung over the upper side of the surface plate mold placed on the front ends of the front and rear carts to prevent the metal from being damaged by hot metal.

When receiving pig iron from the residual pig iron trough 3, the pig iron is received from the most advanced surface plate mold 6, and the mold truck 8 is moved by the mobile vehicle K2 to sequentially receive the pig iron into the surface plate molds 6.

When one bogie 8 finishes receiving pig iron and moves to the next bogie, the residual pig iron flows onto the protective iron plate 7, but at this point, the moving speed of the locomotive K2 is increased and the protective iron plate is removed as much as possible. 7. Reduce the amount of flow to the top.

As described above, in the pig iron receiving method of the present invention, pig iron is continuously and sequentially received into the surface plate mold 6 on a truck, and the residual pig iron is collected in a plate-like body. The plate-shaped residual pig iron obtained in this example was about 4 tons, and when the furnace bottom was dismantled, there was no residual pig iron left at all.

This means that the residual pig iron was completely removed (discharged).

As described above, as an example of a method for discharging residual pig iron during blowdown of a blast furnace, that is, a method for receiving pig iron, first receiving pig iron into a hot metal ladle and then receiving pig iron into a surface plate mold.

When using the present invention, depending on the amount of residual pig iron, the height positional relationship between the tap hole and the hot metal ladle, etc., it is necessary to decide whether to receive the pig iron only with the hot metal ladle or with only the surface plate mold.
Alternatively, there is a method of receiving pig iron by combining a hot metal pot and a surface mold.

FIG. 9 is a diagram showing a method of alternately receiving iron into pots of group A and pots of group B by tilting the transfer trough 9 about its center as a fulcrum.

"Effects of the Invention" By carrying out the present invention, it has become possible to recover most of the residual pig iron as hot metal without cooling and solidifying it in the dry bit, and it has become possible to send it to the next process as it is.

In addition, by receiving the residual pig iron that cannot be recovered by the hot metal pot method described above using a surface mold, the amount of mechanical crushing is extremely small, which reduces work costs and greatly contributes to shortening the construction period. .

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention. FIG. 2 is a plan view showing an embodiment of the present invention. Figures 3 to 7
The figure is a side view showing replacement of the hot metal ladle in the present invention. FIG. 8 is a side view of a surface mold placed on a trolley and a protective iron plate provided between the trolleys. FIG. 9 is a front view showing a method of alternately receiving molten metal into the ladle by tilting the trough using the central part as a fulcrum. 1: Hearth bottom refractory, 1a: Refractory erosion part, 2: A
Side pig iron gutter, 3: B side pig iron gutter, 4: Hot metal pot, 5: Forwarding gutter, 6: Surface plate mold, 7: Protective iron plate, 8: Surface plate mold trolley, 9: Connector, 10: Blast furnace Main body, A1,
A2: Hot metal pot of group A, B1, B2: Hot metal pot of group B, K1: Mobile car on A side, K2: Mobile car on B side.

Claims (1)

[Claims] 1. In a method of continuously receiving the residual pig iron at the bottom of a blast furnace into a plurality of hot metal ladle, the furnace wall (furnace bottom) is arranged so that the residual pig iron at the blast furnace bottom flows down naturally into the hot metal ladle. A hot metal ladle that receives pig iron by opening a hole, allowing residual pig iron to flow out from the opening into a residual pig iron trough, allowing the residual pig iron that has flowed into the residual pig iron trough to flow out into a crossing trough, and operating the crossing trough. by changing
A method for receiving blast furnace bottom pig iron, which is characterized by continuously receiving pig iron into a plurality of hot metal pots. 2. The method for receiving blast furnace bottom pig iron according to claim 1, characterized in that the hot metal ladle receiving the pig iron is changed by changing the direction of inclination using the vicinity of the center of the ferry as a fulcrum. 3. The method for receiving blast furnace bottom pig iron according to claim 1, characterized in that only one end of the transfer gutter is moved up and down, and the transfer gutter is used when changing the ladle for receiving hot metal. 4. In a method of continuously receiving pig iron residue at the bottom of a blast furnace into a plurality of surface plate molds, a hole is opened in the furnace wall (furnace bottom part) so that the residual pig iron at the bottom of the blast furnace naturally flows down to the surface plate molds, The residual pig iron is allowed to flow out from the opening into the residual pig iron trough, and a truck loaded with a plurality of the surface plate molds in close contact with each other is placed directly below the trough mouth of the residual pig iron trough. A method for receiving blast furnace bottom pig iron, which is characterized by continuously receiving pig iron into a surface plate mold while moving a cart.