JPH0718317A - Slag stopper for hot metal car - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] There are many disclosures about slag stoppers that prevent the outflow of slag when discharging hot metal from a hot metal car to a hot metal ladle, but there are satisfactory effects. Since the listed device is hardly found, it provides an epoch-making improvement device. [Structure] An independent body that is not attached to the hot metal car, and is a slug stopper main body that is immersed in the hot metal of the hot metal port when the hot metal is discharged, a holding arm that holds the slag stopper main body, and the arm is rotatable. It comprises a lifting post that can be lifted and swung freely, and a spring member that stands upright on the arm and connects the center of the lifting post to the lifting post. By applying the pressure, the slag stopper body is caused to follow the tilting accompanying the hot metal discharge of the hot metal truck, and the hot metal is always discharged without the outflow of slag. [Effect] Not only is the outflow of slag from the mixed piggyer to the hot metal ladle reduced to 10 to 20% of the conventional value, but the accompanying effect is extremely large.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slag stopper for a mixed pig car, and more particularly to a slag stopper which is not attached to the mixed pig car and is provided in a raw material yard of a steelmaking plant and prevents slag from flowing out when the molten pig metal is discharged. .

2. Description of the Related Art A mixed pig metal containing hot metal from a blast furnace is mixed with a small amount of blast furnace slag at the time of receiving pig iron, and recently, is subjected to pretreatment such as dephosphorization, desulfurization and desiliconization during transportation to a steelmaking plant. Therefore, the pretreatment agent is slag. Therefore, when tapping hot metal from a hot metal car to a hot metal ladle in a steelmaking plant, slag floating on the hot metal surface inside the hot metal car may flow out to the hot metal ladle.
There is a risk of re-phosphorization and re-sulfurization, so it must be minimized. Also in the hot metal truck, the residual dephosphorization and desulfurization slag interferes with the subsequent pretreatment, so that the residual slag is completely discharged after the hot metal is dispensed. However, when the slag is discharged with the tilting angle of the hot metal car being fully tilted, a small amount of hot metal remains, and in the past, it was attempted to scrape out the slag after discharging it completely into the hot metal ladle. In addition to high heat work, there was a drawback that the hot metal yield was reduced.

In order to eliminate such drawbacks, many techniques have been disclosed for preventing slag from being mixed in when hot metal is discharged from a conventional hot metal wheel. The outline of the conventional technique will be described below. JP-A-56-93807: The gist of the present invention is as follows. That is, "a slag stopper for a towed vehicle, which includes a stopper support member that is detachable at a position straddling the opening of a towed vehicle and a stopper with a handle that is rotatably mounted around the mounting position of the stopper support member." Is. This invention adopts a system in which a rod-shaped slag stopper is inserted into the inside of the towed pig wheel, rotated by 90 degrees, and hooked on the towhole of the towed piggy car. However, this invention cannot rotate the rod-shaped slag stopper 90 degrees inside the tow truck when the level of the molten metal is high, or when a large amount of solid slag or metal is attached around the taphole, Therefore, there is a problem that it requires a lot of time and labor for mounting.

JP-A-62-146208: The gist of the present invention is as follows. That is, “a gas injection nozzle is provided in a gas header that is rotatably supported by a support base that is detachably installed in a state of straddling the hot metal outlet on the hot metal car and that is connected to a pressure gas supply source. At the same time, a balance weight for maintaining a constant gas injection angle of the nozzle is provided on the gas header. This invention
A gas header is rotatably attached to a support table that is provided in a state of straddling the hot metal outlet, and a method is adopted in which gas is injected to push the slag floating on the hot metal toward the back. However, this invention has a problem that the slag is scattered by the gas injection and that the surface of the hot metal is easily cooled and oxidized.

JP-A-63-219515: The gist of the present invention is as follows. That is, "a slug / stopper is composed of a frame that straddles the upper portion of the furnace mouth or pot of a torch car, and a stopper body suspended on the lower surface of this frame, and the substantially C-shaped hook of the frame is used as a furnace. The frame is attached to the torpedo car or pot by dropping and engaging with the pin bracket provided on the mouth or the outer periphery of the pot, and the stopper body is thrust into the furnace mouth or pot, and the stopper body is connected to the toorle or pot. The throat slag stopper device in which the support pins at both ends of the main body, which are parallel to the tilt center of the main body, are freely engaged with the V-shaped guide holes on the frame side. As is clear from the above-mentioned gist, the present invention adopts a method of attaching the slide-type outflow prevention plate to the receiving port. However, the slide plate and the mounting plate are large, and the attachment and detachment of these are large, which requires time and labor for mounting, and there is a drawback that if the slag adheres to the slide plate, it is difficult to remove.

Japanese Patent Application Laid-Open No. 54-99706: The present invention is an invention of "application method and apparatus for hot metal from mixed pig iron" according to the applicant's application, and the summary thereof is as follows. That is to say, "1. When tapping hot metal from a hot metal car, in the process of tapping, a spout part of the hot metal car is covered from outside with a blocking plate having a through hole to block the hot metal slag outflow passage of the spout while A method for discharging hot metal, etc. from a hot metal car, characterized in that only hot metal is allowed to flow out from the hole 2. A support frame is provided on the hood carriage that is located on the hot metal pot when the hot metal is discharged from the hot metal car, and the support frame is provided on the support frame. A mounting rod, to which a blocking plate for preventing the outflow of molten slag from the towing car was fixed, was swingably mounted, and the free end of the cylinder for swinging was engaged with the rear end of the mounting rod. Discharge device for molten pig iron, etc. As is apparent from the above-mentioned gist, the present invention is a system in which the perforated plate is pressed into the receiving hole and the slag is pressed backward. However, in the present invention, hydraulic equipment such as a hydraulic cylinder is directly subjected to radiant heat of hot metal, which may cause malfunction due to high heat. There is a problem that it is difficult for the up and down movement of the arm that supports the base to follow the fluctuation of the molten metal surface.

[0006] Actual Kaihei 2-87053: The gist of this invention is as follows. That is, "a slag lid for a mixed pig car piggyhole, wherein a slag lid for separating and removing the slag of molten pig iron is provided in the pig iron mouth of the piggy car." This device has a structure in which a lid made of a refractory material with holes formed in the top and bottom is attached to the piggyhole, and only the hot metal is allowed to flow out from the lower opening, but it takes time to remove the lid and the mounting bolt An operator must approach the hot iron receiving port for removal, and if slag adheres to the inside of the lid, it must be completely removed for reuse, but this problem is difficult. is there.

JP-A-2-197512: The gist of the present invention is as follows. That is, "1. A mixed pig iron car with a detachable weir for slag cutting on the outer surface of the taphole. 2. When the weir comes into contact with the outer surface of the taphole, air is replaced at the top of the taphole. The mixed pig iron according to claim 1, wherein the void is formed in a shape that forms a void for hot metal discharge in the lower portion. " That is, the present invention is an apparatus in which an opening / closing lid having an upper portion and a lower portion cut is attached to the taphole, the molten pig iron is caused to flow out from the lower void, and the slag is trapped inside. However, also in the present invention, for example, during hot metal pretreatment, for example, when blowing a dephosphorizing agent, when the splash of hot metal occurs and adheres to the rotating part of the lid, etc., the lid cannot be opened and closed, and the hot metal due to splash and If the slag adheres to the tap hole, the lid will not be completely closed, and there is a problem that the hot metal flows out from the gap and scatters.

[0008]

DISCLOSURE OF THE INVENTION Problems to be solved by the prior art of the slag stopper in the above-mentioned towed piggy car have been studied, and the following conclusions have been obtained. (B) As a device for preventing the outflow of slag from the mixed pig iron, it is inappropriate to additionally install it in the vicinity of the receiving pig iron port of the mixed pig iron. The reason for this is that since pre-treatment such as dephosphorization and desulfurization is performed on the mixed pig iron, it is easy for deposits of metal and slag to be generated at the pig iron port due to splash of molten pig iron, etc. Difficult to do. (B) Therefore, the slag outflow prevention device should be installed independently in the raw material yard of the steelmaking plant that discharges it to the hot metal ladle.
Since the environment is high temperature and dust generation, it is necessary to simplify the structure and minimize the functions.

[0009]

In view of the problems of the prior art of the above-mentioned slag stopper for a towed piggy car, the object of the present invention is subordinated, and it is not possible to accurately follow the fluctuation of the molten metal level accompanying tilting of the towed piggy car. Since it is extremely difficult, it was possible to absorb the fluctuation of the molten metal level by using a spring or the like, and as a result of various tests, the invention as in the following gist could be completed. (1) In a slag stopper for a mixed pig car that prevents slag from flowing out when the molten pig metal is discharged, an L-shaped lifting post suspended by a crane or the like and a stopper holding arm at the tip of the lifting post. And a slug stopper made of refractory that is rotatably attached,
A locking lever provided upright on the slug stopper holding arm, and a spring member connecting the locking lever via a stopper plate attached to a central portion of the elevating post. A slag stopper for a mixed-steam vehicle, wherein the spring member supports the own weight of the slag stopper main body arranged on the molten-metal surface in the mixed-steam vehicle to absorb fluctuations in the height of the molten-surface of the mixed-spot vehicle. (2) The elevating post is lowered until the slag stopper main body reaches the molten metal surface of the hot metal car, and after the slag stopper main body reaches the molten metal surface, a constant downward pressing force is applied to the elevating post. The slag stopper for a towed vehicle according to (1) above, wherein the slag stopper body is configured to move up and down by following the tilting of the towed vehicle. (3) At the time of lowering the elevating posts in the raw material yard of a steelmaking factory to discharge the hot metal of one of the mixed piggy cars, after finishing the slag outflow prevention work, the elevating post is swiveled 180 degrees and the hot metal of another adjacent mixed piggy car is immediately moved. The slag stopper for a towed vehicle according to (1) or (2) above, which makes it possible to prevent slag from flowing out at the time of discharging.

Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic cross-sectional view showing a state in which a slag stopper according to the present invention is brought close to a receiving pig iron port of a hot metal truck prior to discharging hot metal from the hot metal truck. 2,
3 and 4 are schematic cross-sectional views showing the operating states of the slag stoppers that follow the changes in the molten metal level due to the decrease in the hot metal during the early, middle, and final stages of hot metal dispensing. First, the structure of the slug stopper 2 of the present invention will be described. An L-shaped lifting post 4 is provided which is rotatably suspended by a crane or the like. A stopper holding arm 6 is attached to the tip of the lifting post 4 rotatably around a pin 5 and is attached to the tip of the stopper holding arm 6. A refractory slag stopper body 8 is attached. A stopper plate 10 is provided at the center of the elevating post 4, and a locking lever 12 is provided upright slightly above the center part of the stopper holding arm 6. A spring is provided between the tip of the stopper lever 12 and the stopper plate 10. It is tied by the member 14.

[0011]

When the towing car 16 enters the raw material yard of the steelmaking plant, the elevating post 4 of the slag stopper 2 of the present invention is lowered to insert the slag stopper body 8 into the socket 18 of the towing car 16. , The surface of the hot metal 20 in the hot metal wheel 16 is dipped. Until the slag stopper main body 8 is inserted into the surface of the hot metal 20, as shown in FIG. 1, the slag stopper main body 8 is inserted while maintaining a constant angle θ in which the own weight of the slag stopper main body 8 and the tensile force of the spring 14 are balanced. When the slag stopper body 8 is immersed in the hot metal 20, as shown in FIG. 5, the buoyancy force F ₂ is received from the hot metal 20 and the slag stopper body 8 floats in the hot metal 20 at a level almost balanced with the own weight F ₁ of the slag stopper body 8. Become. At this point, the weight F of the slag stopper body 8
Tensile force of spring 14 generated to support ₁ F ₃ ≈0
Then, the length of the spring member 14 returns to the original free length X ₀ . In this case, the elevating post 4 is properly lowered, and the height between the pin 5 and the stopper body 8 is maintained at H ₀ .

Next, as shown in FIGS. 2 and 3, the hot metal wheel 16 is tilted and the hot metal 20 is gradually discharged to the hot metal ladle 22. By lowering the elevating post 4 according to the level of the molten metal surface, If the slag stopper body 8 is made to float on the hot metal 20 at all times, the outflow of the hot metal 20 from the hot metal port 18 passes under the slag stopper body 8 and flows out, so that the slag 24 floating on the hot metal 20 Spills are prevented. In this case, if an appropriate pressing force F ₄ is applied to the elevating post 4, as shown in FIG. 6, when the elevating post 4 descends too little and the height of the elevating post 4 becomes H ₀ + _ΔH. Since the slag stopper body 8 is less dipped in the hot metal 20 and therefore the buoyancy F ₂ is reduced and the spring member 14 extends to (X ₀ + _ΔX ), the spring member 14 is pulled by the reduced amount of buoyancy. A force F ₃ is produced. Therefore, F ₃ = K _Δ X
(However, K is a spring constant.) A downward component force F ₃ · sinα is applied to the elevating post 4 by the tensile force F ₃ of the spring member 14.
Lowers and the slag stopper body 8 has its own weight F ₁ and buoyancy F ₂
When and are in balance, the descent stops.

On the contrary, if the elevation of the elevating post 4 is too large, the height of the elevating post 4 is H as shown in FIG.
₀ - _△ since the H ', will be slag stopper body 8 sinking into the hot metal 20, thus better buoyancy F ₂ becomes larger than the self weight F ₁ of the stopper main body 8, the length of the spring member 14 (X ₀ - _△ X') and so shrinks, compressive force F ₃ 'occurs in the spring member 14 by the increase in buoyancy. At this time, the buoyancy F ₂ acting on the stopper body 8 is F ₂ = F ₁ + F _{3 ′} sinα
′ + F ₄ , and an upward component force F _{3 ′} sinα is applied to the elevating post 4 as a spring reaction force, so the elevating post 4 rises and rises when the own weight F ₁ of the slag stopper body 8 and the buoyancy F ₂ are balanced. Is stopped. Thus, according to the present invention, the descending and ascending of the elevating post 4 are adjusted so that the slag stopper body 8 is constantly immersed in the hot metal 20 by the action of the spring member 14, so that the slag stopper body 8 is used for the mixed pig wheel. The molten metal 20 moves in accordance with the tilting movement of the molten pig iron 16 as it is discharged, and the molten pig iron 20 is constantly discharged under the slag stopper body 8 to prevent the slag 24 from flowing out.

An appropriate pressing force F ₄ applied to the lifting post 4 is 1/20 of the own weight of the slag stopper body 8.
It has been experimentally confirmed that a small force of about ⅕ is sufficient, but the magnitude of this force should be such that the slag stopper body 8 can be prevented from rising from the molten metal surface by the lift force accompanying the payout of the hot metal 20. It has been found. Further, as shown in FIG. 1, the elevating post 4 of the slag stopper 2 according to the present invention can be lifted and swung freely by a suitable hoisting device that runs on the ceiling at the center of the raw material yard of a steelmaking plant. By determining the tip end length l ₀ according to the distance to the piggy hole 18 of the adjacent mixed piggy car 16, the elevating post 4
By turning 180 degrees by 180 degrees, when the payout of the left towing car 16 is completed, the paying-out work of the other adjacent towing car 16 can be started immediately, and the work efficiency can be improved. In addition, as shown in FIGS.
As a result of investigating the loci of the slag stopper body 8 and the pig iron port 18 from the initial stage of the molten pig iron 20 through the middle period to the final stage of the molten pig iron, the angle θ of the stopper holding arm 6 of the slag stopper main body 8 is, for example, ± 45 degrees. However, it is better to provide upper and lower rotation stoppers 26A and 26B in consideration of damage to the spring member 14 and the like. The shape and type of the spring member 14 are not particularly limited.

[0015]

In view of the problems of the conventional apparatus, the slag stopper for a mixed pig car according to the present invention is provided independently, for example, in a raw material yard of a steelmaking factory, without being provided in the vicinity of the mixed pig car pig iron port. In addition, the structure is simplified so that the slag stopper main body 8 can be used only in a high temperature and dusty atmosphere and only by the lifting / lowering operation of the lifting / lowering post 4, so that the slag stopper body 8 can be used for the hot metal 20 of the hot metal wheel 16.
Since the configuration is such that it moves following the tilting movement associated with the payout, the drawbacks of the conventional device can be eliminated and the following great results can be obtained. (A) Since the action of the slag stopper according to the present invention is extremely effective, the amount of slag flowing from the mixing pig wheel to the hot metal ladle can be reduced to 10 to 20% of the conventional amount. (B) By rotating the entire lifting post 180 degrees, it is possible to sequentially carry out the hot metal payout of two adjacent hot metal cars, and the efficiency of the hot metal payout work is dramatically improved. (C) Since (a) eliminates the need to remove slag from the hot metal ladle,
It was possible to improve the hot metal yield while reducing the load on the operator. (D) Since the slag removal work is unnecessary and the hot metal payout time is shortened, the temperature drop of the hot metal is reduced by 2 to 5 ° C. (E) Since the amount of slag spilled from the hot metal truck has been significantly reduced,
The melting loss of the slag line refractory in the hot metal ladle was reduced, and the basic unit of refractory could be reduced by 2 to 5%. (F) Since no dust was generated when slag was removed from the conventional hot metal ladle, the working environment was improved and the dust collection function had a margin. (G) Since there is no re-phosphorization and re-sulfurization due to slag slag outflow, it was possible to reduce the unit consumption of auxiliary raw materials in the converter. (H) Since the amount of outflow slag is extremely small, the weight of the hot metal charged into the converter can be accurately grasped, which makes it possible to improve the accuracy of the initial value of the converter blowing process, and as a result, the basic unit of auxiliary raw materials can be reduced. It was (I) The slag stopper according to the present invention has a simple structure, but its action and effect are extremely large, and since it acts by following a tilting movement of the tow truck by giving a slight pressing force to the elevating post, the operator does not. The load is small and there is no need to increase staff.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a mutual position and a configuration immediately before a molten pig iron in a mixed pig iron car in a raw material yard of a steelmaking factory is discharged to a molten pig iron pot while preventing slag from flowing out by a slag stopper according to the present invention.

FIG. 2 is a schematic cross-sectional view showing the initial mutual position and action of hot metal dispensing from the hot metal wheel to the hot metal ladle by the slag stopper according to the present invention.

FIG. 3 is a schematic cross-sectional view showing the middle stage of hot metal payout following FIG.

FIG. 4 is a schematic cross-sectional view showing the final stage of hot metal payout following FIGS.

FIG. 5 is a cross-sectional view for explaining the action on the slag stopper body and the spring member when the elevating post of the slag stopper according to the present invention is appropriately lowered.

FIG. 6 is a cross-sectional view for explaining the action exerted on the slug stopper body and the spring member when the raising / lowering post is lowered too little in FIG.

FIG. 7 is a cross-sectional view for explaining the action on the slug stopper body and the spring member when the raising / lowering post is excessively lowered in FIG.

[Explanation of symbols]

 2 Slag stopper (whole) 4 Lifting post 5 Pin 6 Stopper holding arm 8 Slug stopper body 10 Stopper 12 Locking lever 14 Spring member 16 Mixer pig 18 Receptacle port 20 Hot metal 22 Hot metal ladle 24 Slag 26A Upper limit rotation stopper 26B Lower limit Rotation stopper

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[Procedure amendment]

[Submission date] September 6, 1993

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7]

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shigeru Omiya 1-chome, Mizushima-Kawasaki-dori, Kurashiki-shi, Okayama (no house number) Kawasaki Steel Co., Ltd.

Claims (3)

[Claims] 1. A slag stopper for a mixed pig car which prevents slag from flowing out when the molten pig iron is discharged from a mixed pig car, and an L-shaped lifting post suspended by a crane or the like and a stopper holding arm at the tip of the lifting post. Via a refractory slug stopper rotatably attached via a lever, a locking lever provided upright on the stopper holding arm, and a clasp attached to the center of the lifting post. And a spring member connecting the locking lever, and the spring member supports the own weight of the slag stopper main body arranged on the molten metal surface inside the mixed pig iron car, thereby varying the height of the molten metal inside the mixed pig iron car. A slag stopper for towed cars that absorbs. 2. The elevating post is lowered until the slag stopper body reaches the molten metal surface of the hot metal, and after the slag stopper body reaches the molten metal surface, a constant downward pressing force is applied to the elevating post. By giving,
The slag stopper for a tow truck according to claim 1, wherein the slag stopper main body is configured to move up and down in accordance with tilting of the tow truck. 3. In the raw material yard of a steelmaking plant, when the elevating post is lowered and the molten pig iron is discharged from one of the mixed piggy cars, the lifting post is turned 180 degrees after completion of the slag outflow prevention work, and immediately another adjacent mixed piggy car The slag stopper for a mixed-hot metal vehicle according to claim 1 or 2, which can prevent the slag from flowing out when the hot metal is discharged.