JPH02236212A - Torpedo car providing iron tapping hole for cutting slag - Google Patents

Abstract

PURPOSE:To efficiently separate slag consistently from start of tapping-off of molten iron to completion thereof by arranging a molten iron tapping hole on circumference of iron shell near a molten iron receiving hole in a torpedo car and hanging a slag cut ball from upper part of the molten iron tapping hole. CONSTITUTION:The molten iron tapping hole 1 is arranged to one side or both side symmetrically on the circumference of furnace body near the molten iron receiving hole 6 in the torpedo car 5. By hanging the slag cut ball 2 from upper part of the molten iron tapping hole 1 with a chain 3 in proximity to inner face of the tapping hole 1, the slag cut ball 2 is made to floating condition on boundary surface of molten iron 7 and slag 8. At the time of starting the tapping-off of molten iron by tilting the torpedo car 5, the slag 8 existing between the slag cut ball 2 and tapping hole 1 at the initial stage of the tapping- off, flows out in a little but the slag cut ball 2 immediately comes to fitting condition to the spherical dent in the tapping hole 1, and the slag 8 is separated from the molten iron 7 and flowing-out of the slag 8 is prevented. Further, at the time of tilting the torpedo car 5, the slag cut ball 2 is floated up on the molten iron 7 and only the molten iron 7 exist near the tapping hole 1.

Description

[Detailed description of the invention] Industrial application field> The purpose of the present invention is to efficiently separate the hot metal and slag in the torpedo car and prevent the slag from flowing into the ladle when discharging hot metal from the torpedo car. This relates to a torpedo car equipped with a taphole for cutting slag. <Conventional technology> When hot metal is discharged from a torpedo car at a raw material pit in a steelmaking factory, if the slag floating on the surface of the hot metal in the torpedo car flows out together with it, the amount of hot metal scraps that can be received in the ladle will decrease. However, in the next process of converter blowing, the reaction efficiency decreases due to the inflow of slag, so it is necessary to maintain the reaction efficiency by using polysilicate as an auxiliary raw material. For this reason, a process to remove the slag from the ladle that received the hot metal and workers were required to remove the slag. In order to eliminate such problems, it is sufficient to prevent the slag from flowing out when discharging hot metal from the torpedo car to the ladle.As shown in FIG. Is there a stopper support at the position where it straddles? ,121 and
A slug stopper for a torpedo car has been proposed, which includes a regular rod 22 with a handle that is rotatably mounted around the mounting position of the stopper support member 21 (Japanese Patent Application Laid-Open No. 56-93).
(See Publication No. 807). However, in this method, the dam rod 22 is pushed to the center of the scene inside the torpedo car 5a from the beginning to the middle of discharging the hot metal 7a from the torpedo car 5a. For this reason, a gap is created between the dam rod 22 and the discharge port 6a, and a detour for the slag is created in this area, making it impossible to sufficiently prevent the outflow of the slag. Also, if the rolling angle of the torpedo car 5a becomes large, there is a risk that the stop collar may come off. Further, as shown in FIG. 6, a support stand 23 is detachably installed in a state straddling the hot metal discharging port 6a of the torpedo car 5aJ-.
A gas injection nozzle 25 is provided on the gas header 24 which is rotatably supported by the gas header 24 and connected to a pressure gas supply source, and a balance weight 26 is provided on the gas header 24 to keep the injection angle of the nozzle 25 constant. A system has been proposed (see Japanese Unexamined Patent Publication No. 62146208). With this method, the gas injection nozzle 25 is kept perpendicular to the scene until the torpedo car 5a is moved to a certain extent, so it is possible to prevent the slag 8 from flowing out at the beginning of discharging the hot metal 7. Can not. Also nozzle 25
Since this method separates the slag 8 by injecting gas from it, it is difficult to prevent the slag 8 that has solidified into large lumps from flowing out. In addition, since all of the above-mentioned methods involve attaching and detaching the slag stopper to the hot metal discharging port of the torpedo car,
Each time a torpedo car comes in, it is necessary to attach and detach it, which is time-consuming, and the work is difficult because various equipment such as dust collection hoods and moving carts are usually installed near the hot metal outlet and above the ladle. There was a problem with sexuality. <The invention tries to solve i! Ig> The present invention solves the problems of the prior art as described above, eliminates the trouble of attaching and detaching the slag stop collar, and also consistently and efficiently separates slag from the start to the end of discharging hot metal from a torpedo car, and discards only the hot metal. The purpose of this project is to provide a torpedo car equipped with a tap hole for cutting slag. <Means for Solving the Problems> To achieve the above object, a torpedo car equipped with a tap hole for slag cutting according to the present invention is provided with a torpedo car equipped with a tap hole for slag cutting provided on one or both sides of the circumference of the iron shell near the tap hole provided in the torpedo car. A taphole is provided on the surface, and from the inner wall of the torpedo car above the taphole, a slag cut ball made of a material having a ratio intermediate between hot metal and slag and having an outer diameter smaller than the inner diameter of the taphole is cut. When the torpedo car is suspended and the torpedo car is tilted to discharge hot metal from the taphole, slag cut balls floating on the interface between the molten pig iron and the slag prevent the slag from flowing out from the taphole. It is characterized by its oval shape. Kusaku Kawa〉 The slag cut ball is suspended from the furnace wall above the taphole, so when the hot metal is discharged by the tilting of the torpedo car, it is moored by buoyancy and floats near the taphole without moving to the center of the torpedo car. Can be done. Near the taphole (on the interface between hot metal and slag)? ．． 'P-
The slag cutter and ball you are playing with are especially the first to be tapped!
At ti1 and just before the end, the slag that is present on the surface of the hot metal after being led to the taphole position by the hot metal that flows out as the torpedo car tilts is separated from the molten pig iron to prevent the slag from flowing out. During the hot metal discharging period, excluding the initial and final stages of tapping, only hot metal exists near the tap hole, and the slag can 1 ball floats above the hot metal, so only the hot metal flows out stably. Therefore, during the entire period from the start to the end of the t8 shin payout, the reslag will not be released.
Molten metal can be discharged. <Examples> Examples of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the present invention provides tap holes symmetrically located on both sides of the same upper part of the furnace body near the receiving port 6 provided in the torpedo car 5, that is, near the molten metal surface level in the longitudinal center of the torpedo car. 1 and 1 are arranged. The taphole again! A slag cutting ball 2 is suspended from the inner wall of the upper torpedo car near the inner surface of the tap hole 1 by a chain 3, so that when hot metal is stored in the torpedo car 5, the slag cutting ball 2 does not move to the center. It is moored so that it is located near the taphole l. In addition, the reason why two tap holes are provided is so that the torpedo car 5 can be turned to either side without discharging hot metal.If the hot metal is being discharged from only one side, It is sufficient to install the tap hole 1 on one side. The shape and size of the taphole L are determined by the wet working conditions, but as shown in Figure 1, a cylindrical shape is preferred. Considering that the specific gravity of hot metal = 6.8L/nr and the specific gravity of slag = = 2 to 31/rrf, the slag cut ball 2 is made of a material with a specific gravity of about 5L/n{, for example, refractory bricks etc. It is formed by casting a core of material around the core with hot metal. As shown in Fig. 3, a spherical recess 4 matching the shape of the slag cut ball 2 is formed in the upper part of the inside of the furnace of the tap hole l, and the slag cut ball 2 is fitted into the spherical recess 4 during tapping of hot metal. It is preferable to stabilize the position. The relationship between the inner diameter D of the tap hole 1 and the outer diameter d of the slag cut ball 2 is d≧0.7.
In particular, it is optimal to set it to d-0.9D to 0.7D. The procedure for implementing the present invention will be explained below with reference to FIG. As shown in FIG. 4(a), when the torpedo car 5 is empty, the slag cut ball 2 is suspended in the air by the lI3, and first the torpedo car 5 receives hot metal 7 discharged from the blast furnace. As shown in Fig. 4(b), the torpedo car 5 that has received a predetermined weight of hot metal 7 passes through the hot metal preparatory station, travels on the ゜ζ track, and enters the raw material pit of the steelmaking factory. At this time, the slag cut ball 2 is anchored by 113 and is floating on the interface between the hot metal 7 and the slag 8. As shown in Fig. 4(C), when the tobee car 5 is moved clockwise one turn to start discharging molten iron from one taphole l, at the very beginning of discharging, the slag carft ball 2 and the taphole l Although some of the slag 8 that exists between the two flows out, it is quickly guided by the flowing hot metal 7 into the spherical recess 4 of the taphole 1.
(See Figure 3), the slag 8 is separated from the hot metal 7 to prevent the slag from flowing out, and only the molten pig iron 7 flows out from the tap hole 1. Furthermore, when the torpedo car 5 is rotated, the slag cut ball 2 floats above the hot metal 7 as shown in FIG. 《Hot metal 7 flows out stably from tap hole 1. As the discharge from the torpedo car 5 progresses and the amount of hot metal 7 decreases, the slag cut ball 2 approaches the taphole l again, gets stuck in the spherical recess 4, and attempts to flow out from the taphole l, as shown in FIG. 4(e). This prevents the slag 8 from flowing and allows only the T8 piglet 7 to flow out from the tap hole 1. When all the hot metal 7 is discharged from the torpedo car 5, the fourth
As shown in Figure (f), although the diameter d of the slag cant ball 2 is smaller than the inner diameter D of the tap hole 1, the tap hole 1 is almost blocked by the slag cut ball 2, so the slag 8 Outflow is prevented. Originally, the viscosity of molten pig iron 7 and slag 8 was 5XIO-'r'a-3 for the former, and 1 to 2 x 10-'Pa-S% for the latter, which was based on FeO Si01.
1 to 8 XIO-'Pa- in Can-Sift system
S, the viscosity of the slag 8 is quite large and it is difficult for it to flow out from the tap hole 1, so the outflow of the slag 8 can be efficiently prevented. Thus, according to the present invention, the amount of slag flowing out at the beginning and near the end of dispensing can be suppressed to about 0.5L. Effects of the Invention> As explained above, the torpedo car equipped with the slag cutting taphole of the present invention provides the following effects. (1) While the hot metal is being discharged from the L-docker, the slag cutting ball is present near the taphole, so slag cutting can be carried out efficiently. (2) Since the slag cut ball is suspended on the inner wall of the torpedo car, there is no need to remove it every time hot metal is discharged from the torpedo car. (3) Slag removal process during cancellation is almost eliminated as there is almost no slag flowing into the ladle. can be omitted.

[Brief explanation of drawings]

Fig. 1 is a plan view showing a tobbed hammer according to the present invention, Fig. 2 is a sectional view taken along arrow A-A in Fig. 1, and Fig. 3 shows the relationship between the tap hole and the slag cut ball according to the present invention. FIG. 4 is an explanatory diagram showing a hot metal discharging situation according to the present invention, FIG. 5 is a perspective view of a conventional example, and FIG. 6 is a sectional view of another conventional example.

Claims (1)

[Claims] A taphole is provided on one side or both sides of the circumferential surface of the iron skin near the taphole provided in the torpedo car, and a taphole is formed from a material having a specific gravity between that of hot metal and slag from the inner wall of the torpedo car above the taphole. , and slag floating on the interface between the hot metal and slag when a slag cut ball having an outer diameter smaller than the inner diameter of the taphole is suspended and the torpedo car is tilted to discharge hot metal from the taphole. A torpedo car equipped with a taphole for slag cutting, characterized in that the cut ball is configured to prevent slag from flowing out from the taphole.