JPS603953A - Device for treating cutting slag of billet - Google Patents

Abstract

PURPOSE:To atomize automatically the cutting slag scattering from a billet and to improve casting efficiency by providing nozzles for spraying high pressure water to the cutting slag and a water tank for contg. the cutting slag falling from a baffle. CONSTITUTION:Cutting slag 6 scatters in a molten state when a billet 1 is cut with a torch 4. High pressure water is sprayed from a pair of spray nozzles 5 to the cutting slag from the billet 1 so as to enclose the entire cutting slag and the slag 6 colliding against a baffle 7 after cooling and atomizing in the short time until the slag 6 contacts with the baffle 7 falls to a water tank 9 underneath the baffle. The scattered cutting slag having a relatively large size passes through the under side of the region where the high pressure water is sprayed by drawing parabola and falls into the tank 9 where the slag is quickly cooled and granulated in the water. The slag 6 in the water 9 is fed to a feed pipe 17 and a separating conveyor 11 by a screw conveyor 10. The slag is separated from the water by the weir plate 19 of the separating conveyor and is contained by a bucket conveyor 12 into a carrying-out carriage 13, by which the slag is carried to the outside.

Description

Detailed Description of the Invention (3,1) Industrial Application Field The present invention relates to a slab cutting slag treatment device for atomizing the cutting slag scattered during slab melting in continuous casting equipment. . - (3, 2) Prior Art Conventionally, in continuous casting equipment, cutting slag scattered during cutting of cast slabs with a burner torch was welded to the screen and peeled off in large clumps.

To remove these large chunks, workers had to go into a room, collect them in packets, and transport them out using a crane, which was hard work in high-temperature conditions. Particularly in continuous casting, it is not possible to wait for the cutting slag to cool before starting work. Further, since the cutting slag forms in large lumps, a large processing area is required, but a large space cannot be taken up when simultaneously casting a single tundish into multiple strands. For this reason, conventional manual discharge work has been accompanied by great difficulties.

(3, 3) Purpose of the Invention The object of the present invention is to atomize cutting slag scattered during cutting of slabs.

(3, 4) Structure of the Invention The present invention will be explained below with reference to embodiments shown in the drawings. A chamber 3 is a torch unit installed surrounding the slab machining, and the unit 3 includes a torch 4 for melting the slab 1, and a torch 4 for cutting the slab 1, and for spraying high-pressure water on the cutting slag 6 scattered at the time of melting to remove fine particles. A pair of high-pressure water injection nozzles 5 for chemical treatment are provided.

As shown in FIG. 2, the nuclear injection nozzle 5 is arranged in a direction Y that intersects with the scattering direction X of the cutting slag 6 scattered during melt cutting of the slab.

In FIG. 1, 7 is a screen for catching the scattered cutting slag 6; 8 is a water injection nozzle for flowing cooling water onto the surface of the screen 7 to cool the screen; 9 is a water tank for receiving the cutting slag;
1o is a screw conveyor for transporting the cutting slag in the water, 11 is a separation conveyor for recovering only the cutting slag from the water and the cutting slag sent from the screw conveyor 1o through the conduit 17; 12 is a separation conveyor for recovering only the cutting slag from the water; A packet elevator 114 for loading the collected cutting slag into the carrying cart 13 is a dust collection port for discharging steam and dust in the fusing chamber 2 and collecting dust, and a nozzle 15 is for injecting water in the water storage tank 16. This is the water pipe to return the water to 8.

18 is a partition plate for separating the cut slag, 19 in FIG. 4 is a cut slag weir plate (fang 3) of the separation conveyor, and addition in FIG. be.

(&5) Production Next, processing of cutting slag by this apparatus will be explained.

When the slab 1 drawn in the direction of the arrow in FIG. 2 is cut with the torch 4, the cutting slag 6 is molten and scattered in the X direction along with the high-temperature, high-speed gas flow. The cut slag immediately after flying out from the slab 1 is sprayed with high pressure water (for example, 40K9
/cd A water film on the surface of the screen 7 is also ensured. Therefore, the cutting slag 6 that collides with the screen 7 does not weld and falls into the water tank 9 below together with the splashing water or the running water on the screen surface.

Further, the scattered slag of relatively large diameter (1 to 5 m in diameter) passes under the high-pressure water injection area in a parabola, falls into the water tank 9, and is rapidly cooled in water and granulated. The cut slag 6 in the water tank 9 is transferred to the feed pipe 1 by a screw conveyor 10.
7. The cutting slag is sent to the separation conveyor 11, separated from water by the weir plate 19 of the separation conveyor, and then sent to the packet elevator.
12, it is housed in a carry-out cart 13 and carried out.

On the other hand, water after the cutting slag 6 has been separated by the separation conveyor 11 is returned to the water injection nozzle 8 by the circulation pump 4 and used for circulation. The steam and mist generated during cooling of the cutting slag 6 are sucked through the dust collection port 14 and transferred to a steam and mist separation device (not shown).
Process with.

In this apparatus, the high-pressure water injection nozzle 5 is a flat nozzle with a long opening in the vertical direction, so that all the scattered cutting slag can be cooled and granulated appropriately.

In addition, by setting the upper end of the high-pressure jet water in a horizontal direction and directing the lower end diagonally downward, all of the scattered cutting slag can be directed toward the screen 7 and the water tank 9.

Further, in order to atomize the cutting slag, it is preferable to install the injection nozzles 5 on both the left and right sides, sandwiching the scattered cutting slag as in the present device, but if only granulation is required, it may be installed on only one side. Flowing water onto the surface of the screen 7 is preferable in order to prevent welding of cutting slag, but the jetting pressure and amount of high-pressure water are sufficiently large.
This is not necessary if the screen 7 is appropriately cooled.

(3, 6) Effects of the present invention Since the present invention can atomize cutting slag, it can be installed on continuous casting strands where installation space is limited, and it can be automated, so it can free up conventional manual work. If this is done, a great effect can be obtained in improving casting efficiency. Furthermore, since the cutting slag is atomized, it is easy to handle after collection.

[Brief explanation of drawings]

The drawings show various embodiments of the present invention, in which Fig. 1 is an overall view, Fig. 2 is a partial perspective view of Fig. 1, and Fig. 3 is a partial perspective view of Fig. 1A-
FIG. 4 is a view taken along line A and FIG. 4 is a view taken along line B--B in FIG. 1 is a slab, 2 is a fusing chamber for the slab, 3 is a torch unit, 4
1 is a torch, 5 is a high-pressure water injection nozzle, 6 is a cutting slag, 7 is a screen, 8 is a water injection nozzle, 9 is a water tank, 10 is a screw conveyor, 11 is a separation conveyor, 12 is a packet elevator, 113 is a delivery cart, 14 is the dust collection port, 15 is the water return pipe,
16 is a water tank. Patent applicant Nippon Steel Corporation

Claims (1)

[Scope of Claims] Continuous casting equipment equipped with a torch for melt-cutting slabs, which includes: (a) a nozzle for spraying high-pressure water onto cutting slag scattered from slabs, and (b) cutting after spraying high-pressure water. A screen that catches the slag, (c
) A water tank for storing cutting slag that has fallen from the screen.