JPS5946286B2 - vacuum degassing container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vacuum degassing container used for removing gases such as hydrogen and oxygen in molten ore under vacuum.

Vacuum degassing is carried out by circulating molten steel in a vacuum degassing vessel under reduced pressure, but the temperature of the vacuum degassing vessel decreases when not degassing, that is, when the vessel is at rest.

If the temperature difference between degassing and resting is large, the materials that make up the vacuum degassing container will deteriorate. To prevent this, electrodes are installed inside the vacuum degassing container to maintain the vacuum degassing container at a high temperature even when it is not in use. A method has been adopted in which a heating device is installed.

It is an object of the present invention to provide an extremely simple method for improving the heating efficiency of electrodes or, even without electrodes, for minimizing the temperature difference between degassing and resting states of a vacuum degassing container. The main idea is to seal the immersion tube opening of the vacuum degassing container with a heat-resistant material.

To explain the present invention based on one embodiment shown in the drawings, a vacuum degassing container 1 is depressurized by a vacuum device (not shown) communicating through a dust separator 3 and a dip tube 9A.
The molten steel in the ladle 4 is sucked out from the ladle 4, and the molten steel is discharged from the immersion pipe 9B, and thus the molten steel circulates in the vacuum degassing container 1.
Degassed.

When the degassing step is completed, the vacuum degassing container 1 is moved slightly upward by the winch 8, the ladle 4 is moved via the trolley 5, and a pair of If the seal device 7 consisting of the seal box 6 is positioned directly below the vacuum degassing container 1 and the seal box 6 is pressed against the mouths of the immersion tubes 9A and 9B by the elasticity of the spring 100, the heat-resistant material 6A inside the outer box 6 will be removed. seals the mouths of the immersion tubes 9A and 9B.

Even if the state of slag adhesion at the mouths of the immersion tubes 9A, 9B changes, the spring 10 adapts to this change, and the mouths of the immersion tubes 9A, 9B are completely sealed by the heat-resistant material 6A in any state.

In the sealing device 1, a dip tube support may be conjugated on the trolley IA.

As the heat-resistant material 6A, for example, fibrous or granular materials such as sand, rock wool, ceramic wool, etc. are used.

Furthermore, the vacuum degassing container 1 is heated by the electrode 2, and at this time, nitrogen is sealed in the vacuum degassing container 1 in order to prevent the electrode 2 from being oxidized.

When the immersion tubes 9A and 9B penetrate into the molten steel, a cap 11 may be attached to remove the slag present on the surface of the molten steel, but in such a case, a seal box 6 is installed as shown in FIG. To remove slag, place cap 11 on the ↓ and seal immersion tubes 9A and 9B simultaneously with slag removal cap 1.
1 can be installed.

To remove slag, cap 1-1 uses chain 11A and dip tubes 9A and 9B.
mounted on.

Since the present invention has an inclined configuration, the immersion pipe opening of the vacuum degassing container is sealed with a heat-resistant material, thereby shielding the vacuum degassing container from the outside world, thereby keeping the vacuum degassing container warm during degassing. In order to reduce the temperature difference between the temperature difference between the temperature difference between the temperature difference between the temperature difference between the temperature difference and the time when the vacuum degassing container is not in use, and to prevent the deterioration of the materials that make up the vacuum degassing container, and also to improve the heating efficiency when heating the vacuum degassing container with an electrode, and to prevent electrode oxidation. This also prevents leakage of the sealed nitrogen.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic diagram showing the state of the degassing process, FIG. 2 is a schematic diagram showing the heat retention state, and FIG. 3 is a partially enlarged view of FIG. 2. FIG. 4 is a partially enlarged cutaway view showing the state in which the slag remover cap is placed on the seal box. In the figure, 1... vacuum degassing container, 6...
Seal box, 6A... Heat resistant material, 9A, 9B
...Dipping tube, 11...Slag removal cap.

Claims (1)

[Claims] 1. A vacuum degassing container in which a vacuum system is connected to the top and a dipping tube is extended from the bottom, and the dipping tube opening is sealed with a heat-resistant material during rest.