JPS58197212A - Method for removing metal from vacuum degassing vessel - Google Patents

Abstract

PURPOSE:To melt easily metal sticking to he inside of a vacuum degassing vessel for molten steel and to discharge and remove the metal by blowing oxygen into the vessel in which treatment is not carried out. CONSTITUTION:When molten steel is refined by vacuum degassing in a degassing vessel 1, metal 2 spatters, sticks to the inner wall of the vessel 1, and solidifies. In order to remove the metal 2, oxygen is blown from the nozzles 3, 4 of the vessel 1, and the opening degree of a shut-off valve attached to the exhaust port 5 is regulated to 10-50% to adjust the concn. of oxygen in the vessel 1 to 2-50%. The metal 2 sticking to the inner wall is melted and discharged into a lower pot 7 through the dipping pipe 6 of the vessel 1. Thus, the sticking metal can be simply removed, and the vessel 1 can be used again in vacuum degassing treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for removing metal deposited in a degassing tank when gas in molten steel is degassed in a vacuum.

Figure 1 is an explanatory diagram of the inside of the vacuum degassing tank. In the figure, A is the main body of the vacuum degassing tank, the opening is the molten steel, C is the vacuum exhaust equipment, and 2 is the cooling equipment. Inside the gas tank is X
Because it is empty, the molten steel scatters at the same time as the gas in the molten steel, and the scattered molten steel adheres to the inside of the degassing tank and enlarges it. As a result, degassing efficiency decreases and other problems occur. The conventional method for removing metal inside the degassing tank was for an operator to cut the metal from the top of the degassing tank using oxygen using a knife. Production problems occur because the cutting time takes a long time. Furthermore, it takes a long time to process the cut metal. In addition, safety measures are required because the worker's posture is poor, and the worker is exposed to radiant heat from cutting bare metal for a long time, resulting in high-temperature work.There are also disadvantages such as a poor working environment, which should be improved. there were.

This invention is a metal removal method that eliminates the above-mentioned drawbacks, and the gist is that the metal scattered during degassing treatment and attached to the tank is removed by a full oxygen injection nozzle in the degassing tank during non-processing. The blown metal is melted and adhered to the tank, and the metal is flowed out from the immersion pipe at the bottom of the degassing tank. This is bullion that has spread during processing, adhered to it, and swelled. In order to completely destroy this metal, the acid system should be injected using all the powder blowing nozzles in 3.4, and then the opening of the exhaust hole shutoff valve in 5 should be adjusted to 1klo to 50%, and the opening in the degassing tank in 1 should be adjusted. By controlling the oxygen concentration to 2 to 5 ON, the metal deposited in the degassing tank is caused to flow out through the immersion pipe of bath 6 due to the oxygen atmosphere in the tank, and is placed below the steel receiving ladle or pot of 7. This is the method to receive it at.

Here, we will show an example of the inventive metal removal method and compare it with the conventional method as follows.

As described above, the bullion removal method of the present invention has the following advantages: (1) The time required for completely destroying the interior of the degassing tank can be greatly reduced, eliminating production problems, and since the bullion in the tank does not enlarge, the degassing efficiency can be improved. It will be an improvement.

(2) There is no need to consider what to do with the removed metal.

(31 workers do not have to work hard because the operation is done remotely.

(4) While the safety problem for the workers is solved, the metal removal method of the present invention is not without safety problems. There are advantages such as

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of the X9 degassing equipment, and Fig. 2 is an explanatory diagram of the inside of the vacuum degassing tank. A is the main body of the vacuum degassing tank, the mouth is the molten steel, No is the vacuum exhaust equipment, 2 is the cooling equipment, 1 is the vacuum degassing tank main body, 2 is the enlarged metal stuck inside the tank, 3.4 is the oxygen blowing nozzle , 5 is an exhaust hole shutoff valve, 6 is a dip pipe, and 7 is a metal holder. −: Agent Patent Attorney Masaaki Akizawa Mitsunobu 2nd Ward Right 1;

Claims (1)

[Claims] (11@Method for removing metal from a vacuum degassing tank, in which the entire lower part of the vacuum degassing tank is immersed in steel to remove metal that adheres to the interior of the vacuum degassing tank during degassing treatment.