JPS6037842B2 - Method for separating hot metal and slag remaining in the tap runner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for separating hot metal remaining in a tap runner from melting iron.

Conventionally, when the tap hole needs to be emptied for repairs or inspections, the molten iron and twill remaining in the tap hole are both discharged from the residual iron extraction port into the tap hole. The molten iron is charged into a torpedo car or an iron receiving pot (hereinafter, the torpedo car and iron receiving pot are collectively referred to as the molten iron container), or only the molten metal is placed in a separate container using a head pouring gutter. In some cases, it may be manipulated.

However, if the hot metal in the container is charged into the converter with minato birch mixed in with it each time the pickled pig iron is removed, the reaction will be adversely affected, so the extra work of cleaning the container and discharging only the molten pig iron is added. In addition, there was a phenomenon in which the sulfur content in the molten metal resulfurized into the hot metal in the vessel, and there were drawbacks such as increased wear and tear on the bricks of the vessel due to the molten metal. An object of the present invention is to provide a method for separating port pig iron and weld metal remaining in a tap hole, which eliminates and improves the drawbacks of the conventional methods, and by the method described in the claims, the above-mentioned Able to achieve purpose.

Next, the present invention will be explained in detail.

FIG. 1 is a longitudinal cross-sectional view of a tap trough immediately after injecting molten iron from, for example, a blast furnace into a vessel via a tap trough provided with a skinmer.

Hot metal A is guided from the tap hole 1 of the blast furnace to the tap trough 2, passes through the gap 4 between the lower end of the skinmer 3 and the bottom of the tap trough, and overflows the rising part of the overflow weir of the hot metal sump 5 to form the smelter. flows into. On the other hand, the melt B, which is dammed by the skinmer 3, overflows the birch spout 6, passes through the melt birch gutter, reaches the rockfall pot, and is led to the melt birch processing equipment. By the way, when the iron has been tapped from the blast furnace, the surface level of the molten iron A remaining in the tap trough 2 is almost the same as the level of the upper end of the overflow weir of the port piggy bank 5, as shown in Fig. 1. At this time, the level of the surface of the lacquerware is the same as the level of the lower edge of the lacquerware.

According to the conventional method, in such a state, the residual pig iron extraction port 7 provided at the lower part of the hot metal pool 5 is drilled to guide the molten pig iron and molten metal in the taphole into the residue taphole, and any known means is used. This was used to separate molten guns and molten metal.

However, all of the conventionally known means have not been able to solve the drawbacks of not only being very time-consuming, but also making it difficult to sufficiently separate the gun and the bellows. According to the present invention, a temporary dam 8 is built with refractories at the upper end of the overflow weir of the hot metal pool 6 as shown in FIG. Make sure that it is at least the level of the lower edge of Yomohane 6.

Next, as shown in Fig. 2, a weight 9 made of cast iron with castable lining, for example, is allowed to immerse and sink into the tap flute on the upstream side of the skinmer by the same volume as the volume of melt remaining in the tap flute. . Then, the molten birch in the trough overflows from the lower edge of the taper to the trough, but since the volume of the immersion groove of the weight is the same as the volume of the molten birch remaining in the tap trough, all of the molten birch is The molten metal overflows from the homohane and is led to the molten gutter, so that no molten metal remains in the outlet gutter. Next, when weight 9 is lifted, only hot metal remains in the tap hole.
By drilling the residual pig iron extraction port 7, all of the molten iron in the tapping trough can be extracted.

Therefore, repairs and inspections of the tap water can be carried out freely thereafter. According to the present invention, as shown in Fig. 2, after the weight is immersed in the tap hole and all the molten metal is discharged from the birch pipe, the temporary dam is installed with the weight in the immersed state. When 8 is removed, hot metal corresponding to the height of the temporary dam overflows the overflow weir and flows into, for example, a vessel.

When the weight is then lifted, the molten pig iron in the tap trough will fall further below the level of the upper end of the overflow weir, which will reduce the boundary between the molten iron and the molten iron in the side wall of the tap trough, where the most wear is normally caused. It is possible to inspect and collect all of the molten iron in the iron tapping trough without removing it from the residual pig iron extractor. As described above, according to the present invention, the following points are far superior to the conventional method.

'1' When removing residual pig iron from the tap runner, molten iron does not get mixed into the hot metal container.

■ Since the bell facing the molten gun in the tap trough can be lowered without removing the remaining guns, inspection and repair of the upper layer of the side wall of the tap trough can be easily carried out.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view showing the residual state of molten iron and molten iron in the tap hole at the end of tapping from the blast furnace, and Figure 2 is the residual state of molten iron when the weight is immersed and submerged according to the present invention. FIG. A... Molten iron, B... Melting temperature, 1... Blast furnace outlet hole, 2... Iron outlet gutter, 3... Skimmer, 4... ...Gap between the bottom of the skinmer and the bottom of the tap hole,
5... Aya Tama, 6... Minato Hane, 7...
... Residue extraction port, 8 ... Temporary dam, 9 ... Weight. Figure 1 Figure 2

Claims (1)

[Claims] 1. After completing the work of storing hot metal and slag from the furnace in their respective containers using the tap trough equipped with a skinmer, a refractory is installed on the upper end of the overflow weir of the hot metal pool downstream of the skinmer. After raising the roof and building a temporary dam, and making the upper end level of this temporary dam equal to or higher than the lower end level of the slag overflow slag installed on the side wall of the tap culvert on the upstream side of the skinmer, weights were installed. Substantially all of the residual slag is immersed and settled in the upstream side of the skinmer of the tap water by the same volume as the volume of the slag remaining in the tap water, and then the weight is lifted as necessary, A method for separating hot metal and slag remaining in a tap hole at the end of tapping work, characterized by leaving only hot metal remaining in the tap hole.