JPS5839027B2 - How to remove scum from molten metal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for removing scum from the surface of molten metal, and provides a method that can efficiently suck only the scum without suctioning the molten metal, and can also remove the scum in a solidified state. The purpose is to make suggestions.

The method of removing scum by suction itself is disclosed in Japanese Patent Application Laid-Open No. 122-1983.
This is disclosed in No. 29, in which a suction port is opened in contact with the scum surface, and the scum is scattered in droplets by a jet of air and discharged and removed by suction flow. The inner walls of the pipes are heated to a humid temperature to prevent scum from adhering to them.

However, if the suction port is in contact with the scum surface and a water jet is formed in the vicinity, there is a risk that the water and molten metal will come into contact and create a dangerous situation, making it impossible to safely remove the scum. .

Furthermore, since the jet airflow is formed toward the scum to make the scum droplet-like, if the scum layer becomes thin, the scum and the molten metal may mix, making it impossible to suck only the scum.

The present invention provides a scum removal method that solves this problem, and embodiments of the present invention will be described below based on the drawings.

First, the apparatus used in the method of the present invention will be explained. In FIG. 1, 1 is a ladle, 2 is a molten metal, and 3 is a scum.

4 is a suction tube that sucks the scum 3, and a suction port 4 is provided at one end of the tube.
' is open.

A jacket 5 is provided around one end of the suction tube 4.

A water supply pipe 7 and a draw-out pipe 10 equipped with an angle valve 8 and a safety valve 9 are connected to the outer wall 6 of the jacket 5, and the jacket 5 is connected to the inner peripheral wall of one end of the suction pipe 4 at multiple locations in the circumferential direction. A water fountain 11 is provided for injecting water inside the suction pipe 4 into the suction pipe 4 .

12 is a scum accumulation tank connected to the other end of the suction pipe 4; 13;
is a vacuum pump connected to the scum accumulation tank 12 via a pipe 14.

In the above configuration, in order to suction the scum 3 floating on the molten metal 2, the vacuum pump 13 is driven with the suction port 4 positioned at an appropriate distance upward from the scum surface as shown in FIG.

Then, the scum 3 will fly about 20 to 50 m due to the suction airflow.
/3 is sucked into the suction port 4'.

At this time, since the suction port 4' is separated from the scum surface, only the scum is suctioned due to the difference in specific gravity, and the molten metal is not suctioned.

Immediately after the suctioned scum is sucked into the suction port 4', it is ejected from each water injection hole 11 toward the scum at a speed of approximately 5 to 15 m/s. The scum becomes particulate matter and is sucked into the scum accumulation tank 12 without adhering to the inner wall surface of the suction tube 4, and only the suction airflow is discharged into the atmosphere through the tube 14 and the vacuum pump 13.

The one end of the suction tube 4 may be formed into a flared shape as shown in FIG. 2, and the water injection hole 11 may be provided in the flared portion.

Further, as shown in FIG. 3, the outer wall 6 of the jacket 5 may be formed of a donut-shaped tube.

However, in either case, the structure is still that the jacket 5 is provided for directly cooling one end of the suction tube 4 with water.

According to the method for removing scum from molten metal of the present invention, as is clear from the above explanation, since the suction port is separated from the scum surface for suction, only the scum can be suctioned due to the difference in specific gravity between the scum and the molten metal, and the molten metal can be suctioned. I can't wait to do it.

In addition, since water is jetted toward the scum immediately after it has been sucked into the suction port to cool and solidify the scum, it is easy to transport and post-process the suctioned scum, and as mentioned above, the suction port can be kept away from the scum surface. Therefore, even if water is injected toward the scum sucked into the suction port, there is no risk that the water will come into contact with the molten metal, and the scum can be removed safely.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic view showing a scum suction state, and FIGS. 2 and 3 are partially enlarged sectional views showing a modified example of one end of the suction tube. 2... Molten metal, 3... Scum, 4... Suction pipe, 4'
...Suction port, 5...Jacket, 11...Water drying 12...Scum collection tank, 13...Vacuum pump.

Claims (1)

[Claims] 1. A scum of molten metal characterized in that the scum is sucked with a suction port located away from the scum surface, and water is jetted toward the scum immediately after being sucked into the suction port to cool and solidify the scum. Removal method.