JPH02187589A - Method of repairing molten metal container - Google Patents

Abstract

PURPOSE:To provide a repairing method by using irregular refractory objects having a long repairing life by a method wherein brick chips ground into fine particles are dispersed on a surface of the irregular refractory objects of a stamped lower layer, and thereafter the irregular refractory objects of the upper layer are stamped. CONSTITUTION:Although work bricks 3 show such a height as one indicated by a broken line N at first, if they are melted and broken to show a shape indicated by a solid line M, for example, if a central part showing an excessive melting damage is to be repaired, at first, the bricks indicated by shaped lines, a ground metal and slags are removed to form a concave part 4. A roughing process for making some irregular surface in an inner surface of the concave part 4 is carried out. Then, a first layer of the irregular refractory objects is stamped to a depth of about 30 to 40mm. Some brick chips 9 broken into 5 to 10mm are uniformly dispersed on the surface of this layer and then the second layer 7 of the irregular refractory objects is stamped on the dispersed layer. The brick chips 9 dispersed on the surface of the first layer 6 pieces into the first layer 6 and the second layer 7 to become aggregate for use in combining the first layer 6 with the second layer 7. In addition, the brick chips of fine particles may be replaced with the removed brick chips.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for repairing damaged parts of a molten metal container.

[Prior art] In recent years, in order to reduce the amount of auxiliary raw materials and Mn-based ferroalloys used in converters, burnt lime, fluorite, and mill scale have been added to the hot metal in the hot metal pot (blast furnace pot) to accelerate the reaction. for N2
A new manufacturing method is being implemented that involves blowing gas and stirring the hot metal to remove silicon and phosphorus. The lifespan of a hot metal ladle that requires replacement of lining bricks is 330 to 400 charges, but because the stirring flow of hot metal washes the center of the bottom bricks violently, the damage to the bricks is greater in the center of the bottom of the pot, and this area has a charge of 200 to 250 charges. Bricks are missing and peeling due to charging, and must be repaired.
Repair methods include replacing the bottom brick or stamping with monolithic refractories.

[The problem that the invention seeks to solve! ] The method of replacing the bottom brick has a long service life of the repaired area (
150 to 200 charge), but this method increases the repair cost because it is necessary to completely replace the bottom brick to make it stand on the edges of the bricks, and it is not balanced with the remaining life of the side wall bricks, so the repair cost is high. The problem is that it is wasted.

Stamping repair using monolithic refractories has the advantage of requiring less repair work and lower costs because it involves removing bricks and adhered slag from damaged areas to create recesses, and then stamping multiple layers of monolithic refractories into the recesses. There are problems in that it causes peeling between the eyebrows and has a short lifespan (40 to 50 charges).

An object of the present invention is to provide a repair method using a monolithic refractory material that has a long service life in the repaired area.

[Means for Solving the Problems] The present invention aims to achieve the above-mentioned object, and includes removing damaged parts of the bottom brick of a hot metal ladle and roughening the inner wall surface of the formed recess to create unevenness. After that, when repairing the recess by stamping multiple layers of monolithic refractories, finely crushed brick waste is sprinkled on the surface of the stamped lower layer of monolithic refractories, and then the upper layer is stamped. This is a method for repairing bricks for hot metal pots, which is characterized by stamping a monolithic refractory.

[Function] The fine brick debris interposed between the eyebrows of the monolithic refractories penetrates the monolithic refractories in the upper and lower layers, and becomes the binding aggregate for the monolithic refractories in the upper and lower layers, so it does not work as before. No flaking between the eyebrows during use.

Therefore, the life of the repaired area is extended.

[Example] Examples of the present invention will be described below based on the drawings. FIG. 2 is a sectional view showing the damaged state of the bottom brick of the hot metal ladle. 1
1 is an iron skin, 2 is a permanent brick, and 3 is a work brick, which comes into direct contact with hot metal.

The work brick 3 initially had a height as indicated by the broken line N, but it has melted away and has become the shape indicated by the solid line M. An example of repairing the central part where erosion is severe will be explained. First, the bricks, ingots, and slag in the shaded area shown in Figure 2 are removed by scraping, creating the recess 4 shown in Figure 2, and roughening is performed to create unevenness on the inner surface 5 of the recess 4, as shown in Figure 1. As shown in A), stamp the first layer 6 of the unshaped large-sized material to a thickness of 30 to 40 mm, and uniformly sprinkle fine brick scraps crushed into 5 to 10 mm on the surface of this layer. . A second layer 7 of monolithic refractory material is stamped thereon as shown in FIG. 1(B).

By stamping the second layer 7, the fine brick chips 9 scattered on the surface of the first layer 6 pierce the first layer 6 and the second layer 7, and bond the first layer 6 and the second layer 7. Becomes aggregate. As shown in FIG. 1(C), fine brick chips 9 are uniformly scattered on the surface of the second layer 7, and a third layer 8 of monolithic refractory material is stamped thereon. At this time, the fine brick chips scattered on the surface of the second layer serve as the binding aggregate for the second and third layers, as described above. In addition, the fine-grained brick scraps may be used by crushing the brick scraps that have been removed by chiseling.

When the stamp material of the material shown in Table 1 was repaired by the method of the present invention on the melted part of the bottom brick made of the material shown in Table 1, it was found that it had a lifespan of 80 to 9 degrees of charge. Ta.

Table 1 Although the above embodiments have been described with respect to a hot metal ladle, the present invention can also be applied to a ladle of molten steel, etc.

[Effects of the Invention] This invention uses fine brick scraps between the eyebrows of the monolithic refractories to serve as a binding aggregate for the upper and lower monolithic refractories, making it easier to repair with conventional monolithic refractories. The service life of the repaired part will be longer than that of the conventional method, and repair costs can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a diagram explaining the procedure for repairing the bottom brick by the method of the present invention, Fig. 2 is a cross-sectional view showing the damaged state of the bottom brick of the hot metal ladle, and Fig. 3 is a recess made in the damaged part of the bottom brick. It is a sectional view showing a state. DESCRIPTION OF SYMBOLS 1... Iron shell, 2... Permanent brick, 3... Work brick, 4... Recessed part, 5... Inner surface, 6... First layer, 7...
...Second layer, 8...Third layer, 9...Fine brick waste.

Claims (1)

[Claims] After removing the damaged parts of the molten metal container and roughening the inner wall surface of the formed recess to make the inner wall surface uneven, stamping was carried out when repairing by stamping monolithic refractories in multiple layers on the recess. A method for repairing a molten metal container, which comprises spreading finely crushed brick waste on the surface of the lower layer of monolithic refractories, and then stamping the upper layer of monolithic refractories.