JPS5811554B2 - Method of suctioning slag on the surface of molten metal and suction head used in the method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for suctioning slag on the surface of a molten metal in which water is injected onto the slag on the surface of the molten metal and the slag is cooled into small pieces and then sucked, and a suction head used in the method. .

The present applicant previously filed Utility Application No. 49-8572 (Utility Application No. 50-9)
No. 8018) proposed a suction head that injects water onto slag on the surface of molten metal and suctions the slag in a cooled and finely divided state.

In the suction head proposed earlier, water is injected onto the suctioned slag at intervals in the circumferential direction of the suction path, so the high-temperature molten slag is not reliably cooled, and the suctioned slag Some of the slag may adhere to the wall surface of the slag suction path and interfere with the slag suction work.

The present invention solves the above problems, and the first invention aims to provide an efficient slag suction method by reliably cooling the suctioned slag into small pieces, The second object of the present invention is to provide a suction head that can reliably cool the suctioned slag into small pieces and further prevent damage to the slag even if it comes close to the slag on the surface of the molten metal. A third object of the present invention is to provide a highly safe suction head that can reliably cool and break the suctioned slag into small pieces, and can also shut off the injection of water into the suction path when necessary.

In order to achieve the above object, the first aspect of the present invention is to inject water from the entire circumferential direction of the slag suction path toward the axis of the slag suction path to cool the slag. In the second aspect of the present invention, a cooling water storage space is formed surrounding a slag suction path, and the cooling water storage space and the cooling water storage space are connected to each other toward the axis of the slag suction path and in the circumferential direction of the slag suction path. In the third aspect of the present invention, a cooling water accommodating space is formed surrounding a slag suction path, and the cooling water accommodating space and the axis of the slag suction path are connected to each other. This configuration includes an opening/closing member that opens and closes a communication path that communicates with a water injection port that opens toward the center and extends over the entire circumferential direction of the slag suction path.

Embodiments of the present invention will be described below based on the drawings.

First, the overall structure of the suction head will be explained with reference to FIG. 1. The suction head 1 consists of an inner cylinder 3 forming a slag suction path 2 and an outer cylinder 4 forming a cooling water storage space surrounding the slag suction path 2. It consists of a suction head main body 5, a suction port pipe 6 attached to the lower end of the suction head main body 5, and a vent pipe 8 connected to the upper end of the suction head main body 5 via a socket 7. After the slag is sufficiently accelerated through a slag suction path 2 extending upward, the slag is conveyed to a separation hopper (not shown) via a vent pipe 8.

Note that the slag suction path 2 is also formed by the inner peripheral surface of the suction port pipe 6.

The upper and lower ends of the outer cylinder 4 are connected to the inner cylinder 3 by annular upper and lower plates 9 and 10 to form a cooling water storage space, and the outer cylinder 4 has a safety valve and an air vent valve mounting pipe seat 11, A water supply pipe seat 12 is attached.

On the other hand, a sleeve 13 having a male threaded portion 14 on the outer peripheral surface hangs down from the lower plate 10, and the suction port pipe 6 is screwed and attached to the sleeve 13. A plurality of communication ports 15 are bored at regular intervals in the direction.

A water injection port 16 is formed between the lower end of the suction head main body 5 and the suction port pipe 6, and extends over the entire circumferential direction of the slag suction path 2 and opens toward the axis of the slag suction path 2. The water supplied into the water storage space is
5 and enters the annular space 18 between the skirt portion 17 at the lower end of the inner cylinder 3 and the sleeve 13, and then passes through the water injection port 16 toward the axis of the slag suction path 2. It is configured to erupt.

The communication port 15 and the annular space 18 form a communication path that communicates the cooling water storage space with the water injection port 16 .

FIG. 2 shows another embodiment, in which an opening/closing member 20 is attached to the lower end of the suction head main body 5, which can shut off the communication path that communicates the cooling water storage space and the water injection port 16. There is.

To explain in detail, the skirt 19 is suspended from the center position of the lower surface of the lower plate 10, and the skirt portion 17 at the lower end of the inner cylinder 3 is
An annular space 21 between this skirt 19 and an annular space 22 between this skirt 19 and the sleeve 13 are formed, and the communication port 15 is bored in the lower plate 10 on the outside of the skirt 19. It opens into the annular space 22.

Further, an air supply pipe 23 is passed through the lower plate 10 from above inside the skirt 19 to open above the annular space 21, and the opening/closing member 20 is fitted in the annular space 21 so as to be movable up and down. An air chamber 24 is formed between the lower plate 10 and the lower plate 10.

The air supply pipe 23 passes through the cooling water storage space, penetrates the upper plate 9, and is led out to the outside, and is connected to an air source via an air solenoid valve (not shown).

Further, the lower end surface of the opening/closing member 20 is formed into a tapered surface facing outward so that the opening/closing member 20 is normally pushed upward by the water pressure passing through the water jet port 16, and on the other hand, when shutting off water, the opening/closing member 20 is pressed upward. In order to ensure the shutoff, the suction port pipe 6 is provided with a groove 27 into which the lower end protrusion 26 of the opening/closing member 20 is fitted and engaged when the opening/closing member 20 is lowered.

The communication port 15 and the annular space 21.22 form a communication path that communicates the cooling water storage space with the water injection port 16.

In this embodiment, the lower surface of the opening/closing member 20 is formed into a tapered surface so that the water flow flowing through the water jet port 16 pushes up the opening/closing member 20. As shown in FIG. You can also make it look like this.

29 is a spring seat, and 30 is a mounting screw.

Next, to explain how the suction head 1 sucks slag from the surface of the molten metal, water is supplied from the water supply pipe seat 12 with the suction head 1 facing above the molten metal, and a vacuum pump (not shown) is activated to suck air. At the same time as the slag is sucked from the slag suction port pipe 6, water is applied to the slag sucked from the water injection port 16 from the entire circumference of the slag suction path 2 toward the axis of the slag suction path 2. sprayed,
The slag is rapidly cooled by the action of the water and is shredded and sent to the separation hopper.

Here, the finely divided slag is separated and removed from the suction air containing a mixture of water, steam and slag.

When the suction head of the embodiment shown in Fig. 2 or 3 is used, when the pressure changes abnormally, such as when the vacuum pressure becomes atmospheric pressure due to a power outage or a failure of the separation hopper, etc., the pressure change is detected by a pressure sensor, and the water supply solenoid valve to the cooling water storage space is closed, and at the same time, the air solenoid valve to the air supply pipe 23 is activated, air is sent into the air chamber 24 to push down the opening/closing member 20, and the lower end of the solenoid valve is closed. By fitting the portion 26 into the groove 27, the water injection port 16 is completely blocked.

When the pressure becomes normal, the pressure sensor is activated again and the air supply to the air supply pipe 23 is stopped, while the water supply to the cooling water storage space is started, water is injected from the water injection port 16, and the slag is suctioned. will be resumed.

Note that before the water supply starts, the opening/closing member 20 is fitted into the groove 27 of the suction port pipe 6 due to its own weight, but as water is being supplied, the opening/closing member 20 remains pushed upward by the pressure that balances the own weight of the opening/closing member 20. is ejected toward the axis of the slag suction path 2 along the path indicated by the arrow.

Furthermore, when the opening/closing member 20 is shut off, a water pressure of about 2 kg/cm2 acts to push up the opening/closing member 20, but the opening/closing member 20 is pushed down much more strongly by air pressure, so the water supply is reliably shut off. be done.

Note that the opening/closing member 20 is designed to operate even when the slag suction path 2 is clogged with molten metal or slag and the vacuum pressure is abnormally increased.

In addition, the present invention can be used to remove slag from a Niru electric furnace, slag in a steelmaking ladle, slag in a low frequency furnace and reverberatory furnace, slag in a cupola ladle, slag in a rimmed steel ingot, etc. It can be applied to remove slag from other molten metal surfaces.

The present invention is as described above, and according to the first aspect of the present invention, water is injected toward the axis of the slag suction path from the entire circumferential direction of the slag suction path toward the sucked slag. The suctioned slag comes into contact with water evenly around it, ensuring that it is cooled and fragmented, and that uncooled slag does not adhere to the slag suction path, allowing efficient slag suction. It is something that can be done.

Further, according to the second aspect of the invention, since there is a water injection port that opens toward the axis of the slag suction path and over the entire circumferential direction of the slag suction path, water is evenly supplied to the sucked slag from around the slag. cooling and fragmentation can be ensured.

Then, a cooling water storage space is formed surrounding the slag suction path,
Since this cooling water storage space and the water injection port are in communication,
Even if the suction head is located close to the slag on the surface of the hot molten metal, it is cooled by the cooling water flowing in the cooling water storage space, and the suction head can be prevented from being damaged by high temperatures.

According to the third aspect of the present invention, in addition to the same effects as the second aspect of the present invention, there is an opening/closing member that opens and closes the communication path that communicates the cooling water storage space and the water injection port. It can cut off water injection into the slag suction path when necessary, such as when the pressure changes abnormally, and prevent water from falling into the molten metal or slag, increasing the safety of slag suction work. It is.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the suction head of the present invention, FIG. 2 is an enlarged vertical cross-sectional view of essential parts showing another embodiment of the suction head of the present invention, and FIG. 3 is a further embodiment of the suction head of the present invention. FIG. 3 is a partially enlarged sectional view. 1...Suction head, 2...Slag suction path, 3...Inner cylinder, 4...Outer cylinder,
5... Suction head body, 6...
Suction port pipe, 9... Upper plate, 10... Lower plate, 12... Water supply pipe seat, 13... Sleeve, 15...・Communication port, 16...Water injection port, 17...Skirt part, 19...
・Skirt, 20...Opening/closing member, 21...
... Inner annular space, 22 ... Outer annular space, 23 ... Air supply pipe, 24 ... Air chamber,
25...Tapered surface, 26...Lower end protrusion, 27...Concave groove, 28...Spring.

Claims (1)

[Claims] 1. Water is injected onto the sucked slag from the entire circumference of the slag suction path toward the axis of the slag suction path, thereby cooling the slag into small pieces. A method of suctioning slag from the surface of molten metal. 2. A cooling water storage space is formed surrounding the slag suction path, and the cooling water storage space is communicated with a water injection port that opens toward the axis of the slag suction path and over the entire circumferential direction of the slag suction path. A suction head featuring 3. A cooling water accommodating space is formed surrounding the slag suction path, and the cooling water accommodating space is connected to a water injection port that opens toward the axis of the slag suction path and extends over the entire circumferential direction of the slag suction path. A suction head characterized by having an opening/closing member that opens and closes a passage.