JPS6225957B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of suctioning and removing molten scum on the surface of a molten metal.

Conventionally, as a method for removing molten scum on the surface of molten metal, negative pressure is applied to the inside of a suction pipe placed at a distance from the surface of the scum layer to suck the scum, and immediately after the suction, water is injected onto the scum. A method has been proposed in which the scum is solidified and the solidified scum is transported by suction airflow. However, since the surface of the scum layer is in contact with the outside air, the temperature is lower than that of the inside, and it is easy to solidify. When suction is performed using a suction tube placed at a distance from the scum layer surface as described above, the suction efficiency deteriorates when the scum layer surface begins to solidify, and once the scum layer surface is completely solidified, suction cannot be performed thereafter. becomes impossible.

The present invention proposes a scum removal method in which scum can be suctioned from inside a layer of molten scum and scum can be effectively removed regardless of the solidification of the surface of the scum layer.

An embodiment of the present invention will be described below based on the drawings. Reference numeral 1 denotes a suction head, which is supported by a support mechanism such as an arm mechanism so as to be movable in three dimensions. The suction head 1 has a cylindrical body 3 with a suction passage 2 inside thereof, and the suction passage 2 communicates with a suction device such as a vacuum pump. The main body 3 has a double structure of an inner cylinder 3a and an outer cylinder 3b, and a cooling device 4 is constructed by filling a cylindrical space between the two cylinders 3a and 3b with water. An injection device 5 for injecting cooling water in the cooling device 4 into the suction path 2 is provided at an opening 2a on the inner surface of the inner cylinder 3a.
It is located near the. The injection device 5 consists of nozzles that are continuously provided around the entire circumference of the inner cylinder 3a, but the nozzles may be provided at appropriate intervals in the circumferential direction of the inner cylinder 3a. A tube body 7 is arranged at an extended position of the suction path 2 with a gap 6 between the opening 2a and the tube body 7, and the tube body 7 is attached to the outer cylinder 3b of the main body 3 via a support member 8. The tube body 7 is made of a heat-resistant material such as ceramic.

Next, a method for removing scum will be explained.
One end of the tube 7 is placed in a layer 11 of molten scum 10 on the surface of the molten metal 9 in a furnace or ladle. Then, the scum 10 moves upward in the tube 7 due to the negative static pressure in the suction path 2, and the liquid level of the scum 10 in the tube 7 reaches the other end of the tube 7. The molten scum 10 that has moved upward in the tube body 7 is solidified near the other end of the tube body 7 by the cooling liquid injected from the injection device 5, and the solidified scum is transferred from the gap 6 into the suction path 2. It is transported along with the suction airflow that is sucked into the air. Even if the surface of the scum layer 11 begins to solidify, the tube body 7 is inside the scum layer 11, so the unsolidified scum 10 inside the scum layer 11 can be sucked out, allowing efficient scum removal. I can do it.

As explained above, according to the present invention, one end of the tube is placed in a layer of molten scum, and the negative pressure applied to the other end of the tube causes the scum to move through the tube and exit from the other end. Water is injected onto the scum that comes out to solidify it, and the solidified scum is transported by suction airflow, so even if the surface of the scum layer begins to solidify, the suction efficiency will not deteriorate, and even if the surface of the scum layer is completely solidified, the suction efficiency will not deteriorate. Suction can be performed and scum can be removed effectively.

[Brief explanation of the drawing]

The drawing is a sectional view showing an embodiment of the present invention. 1... Suction head, 2... Suction path, 4...
...Cooling device, 5...Injection device, 6...Gap, 7...
...Pipe body, 9... Molten metal, 10... Molten scum.

Claims (1)

[Claims] 1 Negative pressure is applied to the other end of the tube with one end inserted into the layer of molten scum, the molten scum is moved through the tube, and after the molten scum has moved, the molten scum that comes out from the other end of the tube is A method for removing scum, which comprises jetting water to solidify the scum, and transporting the solidified scum by a suction airflow that has passed around the outer periphery of the other end of the tube.