JP2005336588A - Hot iron runner and forming method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot iron runner having superior durability, which inhibits the erosion of a portion to be particularly severely eroded by molten pig iron or slug, and can be continuously used for a far longer period than a conventional one. <P>SOLUTION: The hot iron runner 1 comprises: a double-layer lining layer consisting of a shaped refractory 5 on an operation side and a cast monolithic refractory 10 on a back side of the shaped refractory, formed on a part of a side wall; and a single-layer lining layer made of the cast monolithic refractory formed on the rest of the side wall. Particularly, when the double-layer lining layer is arranged at the portion to be severely worn by the molten pig iron or the slug, such as a position on which the molten pig iron drops from a tap hole of a blast furnace, the runner can sufficiently show the effect for the durability. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention has a durability having a two-layer lining layer (also referred to as a “work brick layer”) formed by combining a shaped refractory material such as brick and an irregular refractory material that has been cast. The present invention relates to an excellent blast furnace tapping and its forming method.

  The blast furnace cast floor is equipped with large iron, hot metal, and slag iron, and the hot metal discharged from the blast furnace outlet is poured into a receiving container such as a blast furnace pan through the large iron and hot metal. . In this case, when pouring from the hot metal into the receiving container, a tilting iron is often used. On the other hand, the slag discharged from the outlet along with the hot metal passes through the big iron, is separated from the hot metal by a skinmer installed at the boundary between the big iron and the hot metal, flows into the slag, and is carried out to a dry pit or the like. Daegu, hot metal, slag and tilted iron are collectively referred to as output.

As shown in FIG. 6, the general structure of the brewing is a lining layer by pouring or spraying an amorphous refractory on the inner surface side of the refractory called the back material 11 previously set in the brewing 30. 31 is formed (see, for example, Patent Document 1). FIG. 6 is a schematic view showing an example of the structure and damage pattern of a conventional tuna. In the figure, reference numeral 12 is a hearth brick, 13 is a refractory castable, 14 is an iron skin, SL is a slag line, ML is a metal line, and the lining layer 31 on the side wall has a construction thickness of 400 to 500 mm. However, due to the erosion caused by the molten metal and slag that passes through, its durability is not sufficient, especially as shown by the broken line in FIG. 6, the slag line part and the metal line part are severely damaged, and in recent blast furnaces The damage to the upper end of the side wall (referred to as “shoulder”) increases as the high-pressure operation and the output temperature rise, and repair of the output is carried out every 25 days. In addition, as an amorphous refractory as a casting material or a spraying material, an Al ₂ O ₃ —SiC—C-based amorphous refractory is widely used at present, and in the past, the lining layer of the iron slag Although there has been a history of using bricks that have been molded as an unstructured refractory, most of them are currently used due to labor saving during construction.

Many proposals have been made in order to extend the life of the seabed by suppressing erosion caused by hot metal or slag. For example, in Patent Document 2, a place where a squeezing flow is strongly hit and where high fire resistance is required, a precast fire-resistant block is arranged as a lining layer along the wall surface of the back material, and other places are provided. Has been proposed to pour or spray an amorphous refractory to form a lining layer, and Patent Document 3 discloses a slag line part and an intermediate part in order from the upper side of the side wall of the puddle. When the metal line part is used, the slag line part is made of an Al ₂ O ₃ —SiC—C amorphous refractory having a SiC content of 75% by mass or more, and the intermediate part has a SiC content of 10%. consists to 70 wt% of Al ₂ O ₃ -SiC-C-based monolithic refractory, metal line part, Al ₂ O ₃ · MgO-based Al ₂ O ₃ content of 10 to 70% by weight of the spinel -Al ₂ O ₃ .MgO spinel-SiC-C Proposals made of irregular refractories have been proposed.
Japanese Patent Publication No.57-23563 JP-A-9-95708 JP 2003-268426 A

However, in the conventional improvement methods including Patent Document 2 and Patent Document 3, local erosion due to hot metal or slag cannot be sufficiently suppressed, and there is an occurrence due to this locally eroded portion. Since the service life of the kite is determined, it was not possible to obtain a life-prolonging effect commensurate with the increase in construction cost by improving the construction method. Therefore, a lining layer is formed by pouring or spraying a conventional Al ₂ O ₃ —SiC—C amorphous refractory, and the old lining layer is connected with a thickness of 50 to 100 mm in a cycle of about 25 days. After that, it was forced to carry out repairs by pouring and spraying an irregular shaped refractory on the old lining layer (referred to as “additional repair”).

  The present invention has been made in view of the above circumstances, and its purpose is to suppress the erosion of particularly severe parts of the erosion caused by hot metal or slag, such as the direct contact of hot metal or slag ejected from the spear opening, It is an object of the present invention to provide an output with excellent durability and a method for forming the same that can be used continuously over a much longer period of time than in the past.

  The tapping according to the first invention for solving the above-mentioned problem is a fixed refractory on the working surface side of the side wall of the tapping, and an irregular refractory cast by casting on the back side of the fixed refractory. A refractory layer made of is formed.

  The tapping according to the second invention is a refractory consisting of a shaped refractory and a non-shaped refractory casted into the back side of the shaped refractory on a part of the working surface side of the tread. A layer is formed, and the other part of the working surface is formed of a cast refractory material that has been cast.

  According to a third aspect of the present invention, in the second aspect of the present invention, the part of the working surface side of the side wall of the tread is a portion where wear due to hot metal or slag is severe. .

  According to a fourth aspect of the present invention, in the second aspect of the present invention, the part of the working surface side of the side wall of the hot spring is a hot metal dropping position from the blast furnace outlet. It is.

  According to a fifth aspect of the present invention, in the first aspect of the present invention, the tapping refractory is restrained by a presser foot provided on the tapping iron skin. To do.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the shaped refractory is made of Al ₂ O ₃ —SiC—C brick, Al ₂ O ₃ —SiC—C—MgO. It is characterized by being at least one of a group brick, an Al ₂ O ₃ —SiC—C—Al ₂ O ₃ .MgO brick, and a C—SiC brick.

  According to a seventh aspect of the present invention, there is provided a method of forming an unhulled refractory by pouring an irregular refractory using a casting metal frame to which a fixed refractory construction part metal frame protruding in a box shape is attached. After forming the lining layer of the object and removing the casting metal frame, construct the fixed refractory in the recess of the lining layer of the irregular refractory formed by the fixed refractory construction part metal frame. A lining layer comprising a regular refractory and an irregular refractory on the back of the regular refractory is formed on a part of the working surface side of the bag.

  According to the present invention, a part of the slag, such as a portion where the wear due to hot metal and slag is severely worn, is a two-layer lining layer composed of a regular refractory and a casting material. Due to the properties of the regular refractory having excellent fusing resistance, it is possible to suppress local severe flaws caused by hot metal and molten slag, and to improve the service life of the brewing. In addition, since the lining layer has a two-layer structure, even if the regular refractory is peeled off or dropped off, a sufficiently durable casting material is applied to the back of the refractory so Troubles that leak through the side wall can be prevented. Furthermore, when viewed in the longitudinal direction of the tuna, the casting material is integrally constructed as a lining layer, and the shaped refractory is fitted into a part of the casting material. Therefore, it is difficult to form a gap between the refractory and the refractory so that the fixed refractory is prevented from coming out, and the effect of the fixed refractory can be exhibited over a long period of time.

  Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 1-3 is a figure which shows an example of embodiment of this invention in the big iron for storing and carrying out the hot metal and slag discharged | emitted from a sprue opening, Comprising: FIG. FIG. 2 is a schematic view taken along the line XX ′ of FIG. 1, and FIG. 3 is a schematic view taken along the line YY ′ of FIG.

  As shown in FIG. 1, the ladle 1 is disposed in contact with a tap hole 21 installed in a blast furnace (not shown), and the hot metal and slag discharged from the tap hole 21 draws a parabola. It falls into 1 and flows in. Depending on the volume of the blast furnace, Oiso 1 has a length of about 15 m. The hot metal and slag are separated by the density difference while flowing down Oiso 1 and further installed at the downstream end of Oiso 1. The hot metal and slag are separated by a skinmer (not shown), the hot metal flows into the hot metal, and the slag flows into the slag.

  The large bowl 1 is divided into three parts, that is, an upstream part 2, a middle stream part 3, and a downstream part (not shown) in the longitudinal direction. The wear of the refractory constituting the large bowl 1 is that of the working surface of the side wall of the large bowl 1. The wear is most severe in the upstream portion 2 where the hot metal and molten slag discharged from the spout 21 fall and the molten metal and slag pass through at high speed. Naturally, refractory material wears out in the middle stream part 3 and downstream part, but in the middle stream part 3 and downstream part, the hot metal and slag only flow inside the firewood. Depends on. A two-layer structure in which the regular refractory 5 is a surface layer portion and the back of the regular refractory 5 is a casting material 10 formed by casting an irregular refractory in a portion of the upstream portion 2 where the working surface of the side wall is heavily worn. A fixed refractory construction site 4 that is a lining layer is formed. In the other part of the working surface, a single-layer lining layer made of the casting material 10 of the amorphous refractory is formed.

  With reference to FIG.2 and FIG.3, the structure of the large bowl 1 which concerns on this invention is demonstrated in detail. As shown in FIGS. 2 and 3, the large bowl 1 has an outer shell in three directions on both side walls and the bottom as an iron shell 14, and a fireproof castable 13 is formed on the side wall and bottom of the large bowl 1 in contact with the iron shell 14. It is being constructed. Further, a hearth brick 12 is disposed at the bottom on the inner surface side of the refractory castable 13, and a back material 11 made of a precast block is applied to both side walls on the inner surface side of the refractory castable 13. The back material 11 and the hearth brick 12 are so-called “permanent tension” and are reused for each repair, not for direct contact with hot metal and molten slag, but with high fire resistance itself. Is not necessary. Therefore, the hearth brick 12 is sufficient in fire resistance, for example, as much as chamotte brick, and the back material 11 is sufficient in high alumina castable.

  And the casting material 10 of the amorphous refractory used as the lining layer which comprises a side wall part and a bottom part is integrally constructed in the inner surface side of this back material 11 and the hearth brick 12. As shown in FIG. This casting material 10 becomes an operation surface as a lining layer in a portion other than the regular refractory construction portion 4 which becomes a two-layer lining layer. On the other hand, on the side wall of the fixed refractory construction site 4, a pre-shaped fixed refractory 5 such as a brick or a precast block is installed on the inner surface side of the casting material 10 to form an operating surface. In this case, the surface of the fixed refractory 5 and the surface of the casting material 10 other than the fixed refractory construction site 4 are substantially flush with each other. That is, in the regular refractory construction site 4, the thickness of the casting material 10 is reduced by the approximate thickness of the regular refractory 5. Here, the part where the fixed refractory 5 is constructed is divided into three ranges from the upper side, and the uppermost part that is less likely to be in direct contact with the hot metal and slag is the lower part of the shoulder, mainly the slag. The part is referred to as a slag line part, and the lowermost part that mainly contacts the hot metal is referred to as a metal line part, and the fixed refractory 5 disposed at each position is referred to as a shoulder member 6, a slag line member 7, and a metal line. This is referred to as member 8. In FIG. 2, SL represents a slag line, and ML represents a metal line.

As the regular refractory 5, since it has excellent corrosion resistance, Al ₂ O ₃ —SiC—C refractories, Al ₂ O ₃ —SiC—C—MgO refractories, Al ₂ O ₃ —SiC—C—MgO. It is preferable to use an Al ₂ O ₃ refractory or a C—SiC refractory. In particular, the lower shoulder member 6 and the slag line member 7 are preferably Al ₂ O ₃ —SiC—C refractories, and the metal line member 8 is Al ₂ O ₃ —SiC—C—MgO refractory, Al It is preferable to use a ₂ O ₃ —SiC—C—MgO.Al ₂ O ₃ refractory. The C-SiC refractory can be applied to any of the lower shoulder member 6, the slag line member 7, and the metal line member 8.

The amorphous refractory forming the casting material 10 is preferably an Al ₂ O ₃ —SiC—C refractory having excellent corrosion resistance among the amorphous refractories. The slag line part and the metal line part may each be changed to an optimum material.

  The fixed refractory 5 is restrained from moving in the vertical direction by a presser foot 16 fixed to the iron skin 14. The presser foot 16 can be installed, for example, as shown in FIG. 4 which is a perspective view showing an example of a fixing method of the presser foot 16. That is, after the fixed refractory 5 is arranged at a predetermined height, the presser foot 16 is welded to the iron skin 14 and fixed, thereby obtaining a predetermined purpose. In order to prevent a gap from being generated between the presser foot 16 and the fixed refractory 5 between the presser foot 16 and the fixed refractory 5 even if the iron skin 14 expands due to heat, for example, 1 to It is preferable to arrange a fire-resistant alumina sheet (not shown) having a thickness of about 3 mm. As this fire-resistant alumina sheet, an alumina sheet having the composition and properties shown in Table 1 should be used because it is excellent in contractibility even under a load under restraint and has high corrosion resistance and high strength. Is preferred.

  In order to protect the presser foot 16 from the hot metal and the heat of the slag, it is necessary to construct a refractory as the shoulder member 15 on the upper portion of the lower shoulder member 6 which is the uppermost standard refractory 5. Then, an irregular refractory is poured into the shoulder member 15 for construction. In order to prevent separation of the irregular refractory, a metal stud 17 (also referred to as “anchor”) is installed on the presser foot 16. With the stud 17, the thickness of the shoulder member 15 can be 1.5 to 2.0 times the thickness of the presser foot 16. 1 to 3 show an example in which an irregular refractory is poured as the shoulder member 15, the shoulder member 15 may be constructed with a regular refractory such as a brick instead of the irregular refractory. The shoulder member 15 can be constructed by providing a groove into which the presser foot 16 is fitted in the regular refractory.

  A method for forming the large punch 1 having the fixed refractory construction site 4 which is the two-layer lining layer will be described with reference to FIG. FIG. 5 is a schematic diagram showing the positional relationship between the metal frame 18 for forming the pouring material 10 and the large wall 1 on which the back material 11, the hearth brick 12 and the like are constructed.

  As shown in FIG. 5, the metal frame 18 has a structure in which a fixed refractory construction part metal frame 20 protruding in a box shape is joined to the outside of the casting main body metal frame 19, and the regular refractory construction part metal frame is formed. The fixed refractory 5 is constructed at 20 position. The fixed refractory construction part metal frame 20 is not joined to the metal frame 18 outside the range where the regular refractory construction part 4 is formed. The metal frame 18 is installed at a predetermined position inside the large bowl 1, and an unshaped refractory is poured into the gap between the metal frame 18, the back material 11 and the hearth brick 12, and the casting material 10 is formed. FIG. 5 shows a state in which the casting material 10 is not installed on the inner surface side of the back material 11 and the hearth brick 12. When the portion is removed, the previous casting material is left on the inner surface side of the back material 11 and the hearth brick 12, and an indeterminate refractory is poured onto the material. In most cases, repairs are usually performed.

After pouring an amorphous refractory previously kneaded with water, the ridge 1 is cured for a predetermined time to solidify the amorphous refractory, and the metal frame 18 is extracted. After removing the frame, the fixed refractory 5 is fitted into the recessed portion of the casting material 10 formed by the fixed refractory construction part metal frame 20. From the viewpoint of preventing hot metal and molten slag from penetrating, the mortar joint cost of the regular refractory 5 is preferably about 1 mm. If the joint allowance exceeds 1 mm, there is a high risk of molten metal or slag penetrating into the joint. On the other hand, if the joint allowance is less than 1 mm, when the shaped refractory 5 is thermally expanded by the heat of the molten iron and slag, the thermal expansion of each other This is because the risk of damaging the regular refractory 5 increases. As the joint material, high alumina mortar (Al ₂ O ₃ ≧ 90 mass%) or alumina-spinel mortar (Al ₂ O ₃ ≧ 90 mass%, MgO≈3 mass%) having excellent fire resistance is used. It is preferable to use it.

  As for the horizontal dimension of the part where the fixed refractory construction part metal frame 20 is arranged, a plurality of regular refractories 5 are constructed at a joint cost of 1 mm. Of course, at the construction site, it is poured into the end of the regular refractory 5. A gap is generated between the ends of the material 10. Also, if there is no gap in this part, it becomes difficult to construct the fixed refractory 5.

  An unshaped refractory is poured into the gap and applied to form the spilled portion 9 shown in FIGS. The amorphous refractory used may be the same as that used when the casting material 10 is formed. The refractory 5 is formed so as to be closely fitted with the casting material 10 by the follower 9. The lateral dimension of the wake portion 9 is preferably about 200 to 250 mm.

  Then, after pressing the fixed refractory 5 with the presser foot 16, the shoulder member 15 is constructed with the irregular refractory or the fixed refractory to form the large ridge 1. Thereafter, natural drying or heat drying is performed as necessary to form the large punch 1 according to the present invention.

  In the large punch 1 according to the present invention, the lining structure at the position where the hot metal and molten slag discharged from the spout 21 are dropped has a two-layer structure in which the surface layer is the fixed refractory 5 and the back surface is the casting material 10. As a result, it is possible to suppress local severe erosion caused by the molten iron and the molten slag, which can be used for a long time. This is because amorphous refractories such as the casting material 10 are relatively low in raw material purity and fired at a low temperature such as hot metal and heat of molten slag. This is because the regular refractory 5 is fired at a high temperature and therefore has superior resistance to hot metal or molten slag as compared to an irregular refractory. In addition, since it has a two-layer structure, even if the regular refractory 5 is peeled off or dropped off, the casting material 10 having sufficient durability is applied on the back surface, so that the hot metal leaks. Can be prevented. Further, even if the fixed refractory 5 comes out, it floats on the interface between the hot metal and the slag in the slag and can be confirmed, so that it can be recovered and repair the hot-out part by hot spraying.

  Further, when viewed in the longitudinal direction of the ridge 1, the casting material 10 is integrally constructed as a lining layer, and the shaped refractory 5 is constructed in a part of the lining layer, so that the shaped refractory 5 is prevented from coming out. The On the other hand, for example, as in Patent Document 2, when the casting material and the fixed refractory are independently constructed on the back material 11, due to the difference in thermal expansion, the casting construction portion and the regular shape are formed. A gap is formed between the refractory construction part and the regular refractory is easily pulled out, but this is suppressed in the present invention. Furthermore, since the fixed refractory 5 is used, it is very easy to select and construct a refractory suitable for each part of the side wall, which contributes to the extension of the service life of the Otsuka 1.

  Although the above description has been given with the example of Oiso 1 as an output, the present invention is not limited to Oiso 1 and the present invention is applied to hot metal, slag iron and tilted iron as well. be able to. In particular, in a tilted iron that receives hot metal falling from the hot metal, it is possible to achieve long-term use by making the lining structure of the hot metal drop position the two-layer structure of the present invention.

The present invention was carried out in a blast furnace having a capacity of 4907 m ³ . First, a lining layer having a two-layer structure according to the present invention was formed in the downstream portion of the ridge with relatively little wear. As the regular refractory for forming the two-layered lining layer, Al ₂ O ₃ : 70 for both the under shoulder member, the slag line (hereinafter referred to as “SL”) member, and the metal line (hereinafter referred to as “ML”) member. Al ₂ O ₃ —SiC—C brick containing 6% by mass, SiC: 6% by mass, and C: 15% by mass was used. In addition, alumina-spinel mortar was used as the mortar for the joint material. The length of the regular refractory construction site is set to 1 m, and after passing about 230,000 tons of hot metal, conventional Al ₂ O ₃ : 18% by mass, SiC: 75% by mass, C: 3. The wear state was compared with the case where the Al ₂ O ₃ —SiC—C-based casting material containing 5% by mass was used as the lining layer.

Table 2 shows the test results expressed by an index with the wear rate of the conventional Al ₂ O ₃ —SiC—C-based casting material as 100, for each part of the side wall portion of Oiso, and Table 3 shows the joint material. The ingredients and properties of the mortar used are shown.

  As shown in Table 2, the wear rate was reduced by 30% at the SL site compared to the conventional casting material, and the wear rate was reduced by 45% at the shoulder portion which is a free board. However, at the ML site, the wear rate was the same as that of the casting material.

  The following matters were also confirmed. (1) Although slight slag and metal intrusion was confirmed only in the ML region in the gap with the casting material on the back, it did not hinder the durability. (2) Oxidation and deformation of the presser foot were slight. (3) Although the cross section of the brick was small, some melt damage was observed in the vertical joints, but the horizontal joint was slight.

  From the test results of Example 1, it was confirmed that the durability of the two-layered lining layer does not deteriorate at least as compared with the case where the conventional casting material was used as the lining layer. A lining layer having a two-layer structure according to the present invention was formed in the upstream portion. In this embodiment, the fixed refractory construction part is arranged over a range of 4 m in total in the longitudinal direction of the saddle, 2 m each in the upstream and downstream directions, with the dropping position of the hot metal discharged from the spout opening being the approximate center. did.

  In this example, in order to confirm the influence of the installation position of the lower shoulder portion, the SL portion, and the ML portion, blocks having a size corresponding to the lower shoulder portion, the SL portion, and the ML portion were manufactured in advance, and these were constructed. Table 4 shows the components and characteristics of the bricks used. Table 4 also shows the components and characteristics of the amorphous refractory used as the casting material. As the joint material, the high alumina mortar shown in Table 3 was used.

Al ₂ O ₃ —SiC—C bricks of bricks A to C shown in Table 4 are used as the lower shoulder portion and the SL part, and Al ₂ O ₃ —SiC—C—MgO bricks of bricks D to F or Al ₂ O the _{3 -SiC-C-MgO · Al} 2 O 3 based bricks were used as SL unit and ML unit. The C-SiC brick of the brick G was used for all of the lower shoulder portion, the SL portion, and the ML portion.

Table 5 shows the results of the investigation of the wear situation when the wear rate of the conventional Al ₂ O ₃ —SiC—C-based casting material is used as a reference when it passes through about 55,000 tons of hot metal. In Table 5, ◎ indicates that the wear is significantly less than that of the conventional casting material, ◯ indicates that the wear is equal to or less than that of the conventional casting material, and △ indicates that the wear is conventional. It represents that it is equivalent to a casting material, and-mark represents that the test was not carried out.

  As shown in Table 5, the bricks A, B, and C showed superior results compared to the casting material at the lower shoulder. This is probably because the addition of graphite as a carbon source and the addition of SiC improved the slag penetration resistance and the spall resistance, and became superior to the casting material.

  In the SL part, the bricks A, B, and C all had the same or better results than the casting material. The SL part is a part where the splash (mixture of slag and hot metal) during brewing and the slag attack to the oxide layer at the slag interface are intense, and these are the parts where the wear is severe, but bricks A, B, C and By doing so, wear could be reduced. In the ML part, the bricks D, E, and F showed the same or better results than the casting material. The ML part, like the SL part, is severely worn by the attack of the splash (mixture of slag and hot metal) during brewing, and the slag attack on the slag-metal interface and the slag attack on the oxide layer. E and F were able to reduce wear. It was confirmed that the addition of spinel aggregate is effective for hot metal resistance. In order to further improve the durability of the SL part and the ML part, it has been found that it is necessary to have an effective refractory composition against the attack of the splash during brewing and the slag attack at the slag interface.

  On the other hand, it was confirmed that the brick G has less wear than the casting material in all of the lower shoulder portion, the SL portion, and the ML portion, and can greatly increase the number of times the large hook is used.

It is a figure which shows an example of embodiment of this invention, Comprising: It is the plane top view of the large bag which concerns on this invention. It is a figure which shows an example of embodiment of this invention, Comprising: It is the schematic by the X-X 'arrow of FIG. It is a figure which shows an example of embodiment of this invention, Comprising: It is the schematic by the Y-Y 'arrow of FIG. It is a figure which shows an example of embodiment of this invention, Comprising: It is a perspective view which shows an example of the fixing method of a presser foot. It is a figure which shows an example of embodiment of this invention, Comprising: It is the schematic which shows the positional relationship of the metal frame for forming a pouring material, and a ridge. It is the schematic which shows the example of the structure and damage pattern of the conventional output.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oiso 2 Upstream part 3 Middle stream part 4 Fixed refractory construction site 5 Fixed refractory 6 Fixed shoulder member 7 Slag line member 8 Metal line member 9 Sink part 10 Pour material 11 Back material 12 Hearth brick 13 Refractory castable 14 Iron skin 15 Shoulder member 16 Presser foot 17 Stud 18 Metal frame 19 Body frame for pouring 20 Metal frame for regular refractory construction part 21 Outlet

Claims (7)

  A brewery characterized in that a refractory layer comprising a regular refractory and an irregular refractory casted on the back side of the regular refractory is formed on the working surface side of the brewery side wall.   Forming a refractory layer consisting of a fixed refractory and an irregular refractory casted on the back side of the fixed refractory on a part of the working surface side of the side wall of the tuna, The part is made of cast refractory material that is cast and cast.   The part of the working surface side of the side wall of the tuna is a part where the wear is severely caused by hot metal or slag.   The part of the working surface side of the side wall of the hot metal is a dropping position of the hot metal from the blast furnace outlet.   The tapping according to any one of claims 1 to 4, wherein the fixed refractory is constrained by a presser foot provided on a tapping iron skin. The above-mentioned regular refractories include Al ₂ O ₃ —SiC—C brick, Al ₂ O ₃ —SiC—C—MgO brick, Al ₂ O ₃ —SiC—C—Al ₂ O ₃ .MgO brick, C— The output according to any one of claims 1 to 5, which is one or more of SiC bricks.   A non-standard refractory is cast by using a casting metal frame attached with a box-shaped fixed refractory construction part metal frame, and an lining layer of the irregular refractory is formed. After removing the frame, install the fixed refractory in the concave part of the lining layer of the irregular refractory formed by the above-mentioned fixed refractory construction part metal frame, A method for forming a bonito, comprising forming a lining layer comprising an irregular refractory on the back of the regular refractory.

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