JPH01129921A - Steel tapping port for converter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tapping port for a converter that prevents slag from being mixed into molten steel during tapping of the converter.

[Prior art] If the slag generated during converter blowing flows into the ladle during steel tapping in the converter, the phosphorus in the slag will rephosphorize during the molten steel in the ladle, and the ferroalloy charged into the ladle may This caused a decrease in the yield of aluminum, an increase in the amount of aluminum used, and melting and damage of the ladle bricks due to the slag that entered the ladle. For this reason, many techniques for preventing slag from flowing out into the ladle have been developed and put into practical use.

JP-A-62-83416 discloses a method for preventing slag from flowing out during steel tapping in a converter. FIG. 2 is a diagram showing a conventional steel tapping method. A guide box 7 having a slidable shielding plate 6 is installed at the tip of the converter tapping port 3, and when it is determined that the slag 2 has flowed out, the extrusion arm 5 and air cylinder 4 connected to the shielding plate are operated to remove the slag. This is a method of cutting.

[Problems to be solved by the invention] In the conventional method, the shielding plate had to be replaced every time steel was tapped, which required a lot of manpower, and the operating rate of the converter could not be increased.
Since the judgment was made after the slag had flowed out, there was a problem that the slag would get into the ladle.

This idea was made in view of the circumstances, and 1.
The purpose is to prevent spillage into the ladle.

[Means for Solving the Problems] The present invention aims to solve the above problems.
A gas injection plug with a large number of small-diameter steel pipes embedded in the refractory around the outer periphery of the converter tap, which is formed in a predetermined area of the refractory wall of the converter vessel. established,
The method is characterized in that an inert gas or CO2 is blown into the converter from a gas blowing plug in which the large number of small diameter steel pipes are embedded in a refractory.

[Function] During tapping, if inert gas flows out from the inert gas injection plug into the molten steel and an upward flow of inert gas surrounding the tap opening is created in the molten steel, the molten steel in the converter will be The slag floating on the surface does not come to the vicinity of the tapping port due to the upward flow of inert gas, so that no slag is mixed into the molten steel being tapped.

[Example] An example of the present invention will be described below based on the drawings. 1st
The figure is a sectional view of a tap hole showing an embodiment of the present invention. In Fig. 1, 15 is the iron shell outside the converter body, and 14
3 is the lining brick of the steel shell, 3 is the tap hole, and 4 is the tap brick that makes up the tap hole. In such a configuration, the tapping port of the present invention has a small diameter steel pipe (0,5
An inert gas blowing plug 8 made by embedding an inert gas blowing plug 8 (mm ~ 3IIIlΦ) 9 in a brick was placed, a wind box 10 was connected to the bottom of the blowing plug 8, and it was installed on the outer periphery of the steel tap shell. A connecting pipe 11 communicates between the header pipe 12 and the wind box 10. Inert gas is supplied to the header pipe 12 from an inert gas container (not shown).

Next, the operation of this embodiment will be explained.

1 is molten steel, and 2 is slag floating on the surface of the molten steel. During tapping, inert gas is sent from an inert gas container (not shown) to the header pipe 12, and from the header pipe 12 to the wind box 10 via the connecting pipe 11. The inert gas sent to the wind box 10 passes through a small diameter steel pipe (1 diameter) 9 of the blow plug 8 and flows out into the molten steel. The discharged inert gas becomes bubbles and rises in the molten steel, forming an inert gas flow 13 surrounding the tap hole 13. The gas flow 13 creates a gushing part 16 of molten steel on the surface of the molten steel, which prevents slag from being mixed into the molten steel being tapped. Although this example was explained using an inert gas, similar effects were confirmed using CO2 gas.

[Effects of the Invention] Since the apparatus of the present invention is configured as described above, there is no need to replace the shielding plate every time steel is tapped as in the conventional method, and there is no need for manpower as only valve operation is required. The operating rate of the converter can be increased. Also, slag will not get mixed into the ladle.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a tap hole showing one embodiment of the present invention;
The figure shows a conventional steel tapping method. 3... Steel tapping port, 4... Steel tapping port brick, 8... Blow plug, 9... Small diameter steel pipe, 10... Wind box, 11...
・Connection pipe, 12...Header pipe.

Claims (1)

[Claims] A gas injection plug with a large number of small-diameter steel pipes embedded in the refractory around the outer periphery of the converter tap, which is formed in a predetermined area of the refractory wall of the converter vessel. established,
A tap port for a converter, characterized in that an inert gas or CO_2 is blown into the converter from a gas blowing plug in which the plurality of small diameter steel pipes are embedded in a refractory.