JPH01129913A - Method for recovering molten pig iron in slag - Google Patents

Abstract

PURPOSE:To recover molten pig iron by simple work with no loss of heat energy by separating and storing molten pig iron with a tiltable spout placed at the tip of a slag spout. CONSTITUTION:A tiltable spout 6 having slag discharge holes 16, 17 on both the right and left sides and a reservoir 15 for storing molten pig iron at the middle is placed just below the tip of a slag spout 4 diverging from a large tapping spout 2 at a position close to a skimmer 3 and slag is discharged into the spout 6. Molten pig iron contained in the discharged slag is separated by the difference in specific gravity and stored in the reservoir 15. After slag discharge is finished, the spout 6 is tilted and the molten pig iron in the reservoir 15 is directly poured into a torpedo car and recovered.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for recovering hot metal contained in slag in tailings.

(Conventional technology) During tapping of a blast furnace, hot metal slag discharged from the taphole flows down a large gutter and is separated into hot metal and slag in a part of the skinma due to the difference in specific gravity. The water is diverted to the gutter.

However, the separation of hot metal and slag by skinmer is
This is difficult to achieve completely, and the slag flowing through the slag trough contains some hot metal.

As a method for recovering the hot metal in the slag, for example, as shown in FIG. 3, a hot metal reservoir II is provided in the middle of the slag gutter 4, and the side wall chamber 4 near this reservoir is easily removed as shown in FIG. The structure is made of sand that can be drilled, and at the end of the tapping stage, holes are drilled in the side wall 14 using a metal rod or the like, and the hot metal accumulated in the pool 11 is poured into the sandbox 13.
The method used was to drain it into a stream, solidify it there, and collect it.

Furthermore, Japanese Patent Application Laid-Open No. 55-69207 discloses that a pig iron slag separation pan is provided in the middle of a slag tap, forming a predetermined head with the slag tap, so that it can rotate and tilt freely. A method is disclosed in which hot metal in the ladle is discharged into a hot metal gutter by rotating and tilting a slag separating ladle at its installed position. A method for continuously processing slag discharged from a blast furnace by arranging a slag separation container having appropriate steps at different parts and having a hot metal discharge port at the bottom so as to be tiltable in a direction crossing the slag flow path. is disclosed.

(Problems to be Solved by the Invention) However, the above-mentioned conventional techniques have the following problems and drawbacks.

(1) The method of providing a pool of hot metal in the middle of the slag gutter is as follows:
This requires a considerable amount of work, including constructing the side walls of the slag gutter using a paper machine, cleaning up solidified pig iron, and leveling the sandbox. This work usually needs to be done every time the pig iron is tapped, and requires about 60 minutes of work time each time by 2 to 3 workers at a frequency of about 10 times/day. This is a major obstacle to promoting work rationalization.

Additionally, because the hot metal is once solidified and then recovered, there is a large loss of thermal energy.

(2) In the method of JP-A No. 55-69207, it is necessary to install a slag separation pan in the middle of the slag gutter, which requires extra height, and the equipment cost for the slag separation container is high. Furthermore, it becomes complicated in terms of handling, which becomes an obstacle when streamlining work.

(3) In the method of JP-A-59-113105, similar to the method of JP-A-55-69207, it is necessary to install a slag separation container with an appropriate step in the middle of the slag gutter. There is a problem in that the low-level equipment itself, which is subject to space constraints, becomes large-scale and increases equipment costs.

(Means for Solving the Problems) The present invention has been made to advantageously solve the problems of the prior art, and has slag discharge ports on both left and right sides directly below the tip of the slag gutter. In addition, a tilting trough having a pig iron storage reservoir is provided in the middle part to discharge the slab, and the hot metal contained in the slag being discharged is separated in the pig iron storage reservoir, and is stored and discharged. The gist of the present invention is a method for recovering hot metal in slag, which is characterized in that after slag is finished, a tilting trough is tilted to directly pour and recover the hot metal stored in the slag into a pig iron mixing car.

The present invention will be explained below based on the drawings.

FIG. 1 is a perspective view of an embodiment of the present invention, and FIG. 2 is a sectional view thereof.

As shown in FIGS. 1 and 2, the present invention provides slag discharge ports 16 and 17 on both the left and right sides of the tap trough 2 directly below the tip of the slag trough 4 which is provided by branching from the vicinity of the skinmer 3. A tilting trough 6 having a pig iron storage reservoir I5 in the middle thereof is provided to discharge the slag, and in this reservoir 15, the hot metal contained in the slag being discharged is separated by the difference in specific gravity. Hot metal is stored in this reservoir, and after the slag is removed, the tilting trough 6 is tilted to directly transfer the hot metal stored in the reservoir 15 to the pig iron mixer 1.
It is characterized by being recovered by pouring iron into zero.

That is, the hot metal and slag coming out of the tap hole 1 pass through the tap hole 2 and are separated into molten pig iron and slag by the skimmer 3, and the slag passes through the slag trough 4 and the tilting trough 6, and then is put into the slag ladle 7. . In the tilting trough 6, the bottom of the trough is deepened in advance into a U-shape to form a reservoir 15 so that the maximum amount of hot metal that can be mixed into the slag in at least one tap, for example, 5 to 10 parts, can be stored.

Further, the relationship between the inclination angle of the tilting trough 6 and the amount of hot metal that can be stored in the reservoir section 15 is determined in advance by calculation or the like.

The slag mixed with hot metal passes through the slag gutter 4 and is poured into the tilting gutter 6.
However, based on the relationship between the inclination angle of the tilting trough 6 and the amount of storage, the inclination of the tilting trough 6 should be determined at an angle that can store the maximum amount of hot metal mixed into the slag in at least one tap. As a result, the slag 8 is separated and stored in the slag ladle 7, and the hot metal is separated and stored in the sump 15 of the tilting trough. After tapping the pig iron, the slag pot 7 is pulled out, the pig iron mixer 10 is pulled in, and the tilting trough 6 is tilted greatly to open the reservoir 15.
The hot metal 9 stored in the slag is poured, and the hot metal mixed into the slag is recovered. 5 in the figure is a hot metal trough.

(Function) The slag containing hot metal flowing down from the tip of the slag trough 4 is mixed and stirred in the reservoir part 5 of the tilting trough 6, and then changes direction and flows to the slag discharge port 16, 17, so that the slag is The hot metal contained therein is separated from the slag due to the difference in specific gravity in the reservoir I5, and is stored in the reservoir I5.

(Example) Based on actual data of the maximum amount of hot metal in the past when the hot metal storage container in the tilting trough 6 was mixed into the slag during one tapping in the foundry equipment as shown in Figure 1, 7 tons (approximately 1 m3 )year,
The tilting gutter has a shape that allows storage up to an inclination of 7 degrees and allows the entire amount to be discharged at an inclination of 15 degrees.

Using a tilting trough with this shape and capacity, it was possible to recover an estimated 20 tons of molten pig iron with an output of 8,000 tons, eliminating the conventional complicated work.

(Effects of the Invention) As described above, according to the present invention, it is possible to completely eliminate the conventional method of storing hot metal in a part of the slag gutter and collecting it by solidifying it on the cast bed. Construction work using sand for side walls, leveling work for sand pits to solidify hot metal,
Cleaning up solidified hot metal can eliminate extremely complicated and burdensome work. In addition, since hot metal can be recovered in a molten state without solidifying, there is no loss of thermal energy, and a significant effect can be obtained in terms of energy conservation.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of one embodiment of the present invention, FIG. 2 is a sectional view thereof, FIG. 3 is a perspective view of an apparatus for implementing the conventional method, and FIG. 4 is taken from A-B in FIG. 3. It is an arrow sectional view. 3φe san〇・Skinmer 4・・・・Slag gutter 6・・・・Tilt gutter 7・・・・Slag pan 8・・・・Slag 9・・・・Hot metal IO・・・Mixing pig iron car 15...Sump portion 16.17...Slag outlet Figure 1 ts2 Figure 3 Figure 4

Claims (1)

[Claims] Directly below the tip of the slag gutter, there is a tilting gutter having slag discharge ports on both the left and right sides and a piggy bank in the middle to discharge the slag. The hot metal contained in the slag in the slag is separated and stored, and after the slag is removed, the tilting trough is tilted to pour the hot metal stored in the reservoir directly into the pig iron mixing car and collect it. A method for recovering hot metal from slag.