JPS6147630B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing erosion of refractories in a ladle.

As is well known, erosion of the refractory material on the inner wall of the ladle after steel tapping is a major cause of shortening the life of the ladle.

As a countermeasure, repairs such as spraying refractories on the eroded areas are taken, but these measures are not very effective and have drawbacks such as the harsh work involved. be.

The present invention has been made to advantageously solve these drawbacks, and is characterized by arranging granular corrosion-resistant refractories around the outer periphery of the molten steel slag in the ladle to follow the movement of the molten steel surface. The present invention relates to a method for preventing erosion of a refractory in a ladle, which is characterized by:

That is, the inner wall of the ladle suffers a large amount of melting damage due to contact with the discharged slag during tapping, and this is particularly noticeable in the case of highly oxidizing slag.

However, in the present invention, as described above, granular corrosion-resistant refractories are arranged around the slag (outer periphery) in the ladle, and follow the movement of the molten steel surface to constantly keep the molten steel slag and the inner wall (bricks) of the ladle together. This prevents contact and prevents melting of the inner wall of the ladle.

For example, as shown in Fig. 1, after tapping, slag floating on the surface of the molten steel is deposited in the ladle.
A holding frame 2 is arranged around the inner wall located at the upper part, and an erosion-resistant refractory 3 is arranged therein, and the ladle 1 is filled with molten steel by tapping, and the slag is placed at the position of the holding frame 2. When the temperature reaches 1, the holding frame 2 is melted by the heat, and the erosion-resistant refractory 3 is positioned around the slag.
The contact between the slag and the inner wall of the ladle 1 is cut off to prevent melting and damage of the inner wall.

That is, the molten steel in the ladle 1 is injected into the mold or dummy bar etc. from the injection port 4, and the slag located on the surface of the molten steel also descends as the surface of the molten steel descends, following the placed erosion-resistant refractories. This prevents contact with the slag all around the inner wall.

In addition, for example, as shown in Fig. 2, ladle 1
Immediately after tapping, the erosion-resistant refractory can be placed on the outer periphery of the slag 6 in the ladle 1 from the hopper 5.

However, as the erosion-resistant refractory placed around the slag in this way, if the inner wall of the ladle is made of siyamoto bricks, siyamoto brick waste, sand, blast furnace slag, natural stone, etc. can be used; If the inner wall of the ladle is made of high alumina bricks, high alumina bricks, blast furnace slag, etc. can be used, and if the bricks in the ladle are basic bricks, dolomite, quicklime, converter brick waste, blast furnace slag, converter can be used. Slag etc. can be used, and the particle size of these is 1 to 50
This can be advantageously achieved by using mm.

By doing so, the durability of the ladle inner wall bricks can be significantly improved, the number of spare ladles can be reduced, and the equipment cost can be significantly reduced.

Further, excellent effects such as being able to reduce ladle repair work can be obtained.

Next, examples of the method of the present invention will be given.

Example 1 Blast furnace slag was placed in advance to a thickness of 200 mm as shown in Fig. 1 above in a ladle for receiving low carbon aluminum killed steel (inner wall bricks were made of Shamotsu bricks), and the molten steel slag and inner wall of the ladle were placed When used while preventing contact, it was possible to use it 100 times (steel receiving), but when the present invention was not implemented, it could only be used 20 times.

Example 2 After receiving molten steel in stainless steel ladle refining (inner wall is basic brick), a doughnut-shaped erosion-resistant refractory made of converter slag was placed on the inner circumference of the ladle for 100 mm around the outer circumference of the slag in the ladle. After placing it in a deep layer and refining it in a ladle, it could be used 300 times. In contrast, when the present invention was not implemented, the number of trials remained at 80.

As described above, according to the present invention, excellent effects were obtained.

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory diagrams showing embodiments of the method of the present invention. 1... Ladle, 2... Holding frame, 3... Erosion-resistant refractory, 4... Inlet, 5... Hopper, 6... Molten steel slag.

Claims (1)

[Claims] 1. A method for preventing erosion of refractories in a ladle, which comprises arranging granular corrosion-resistant refractories around the outer periphery of molten steel slag in a ladle to follow the movement of the molten steel surface.