JP5463262B2 - Blast furnace - Google Patents

Description

  The present invention relates to a blast furnace main board and a method for manufacturing the same, and more specifically, to shorten the construction time of a refractory material during the production of the blast furnace main board and to suppress or prevent the occurrence of through cracks in the refractory material layer. Regarding technology.

  The blast furnace main flow through which the hot metal discharged from the blast furnace flows is a wear lining layer, a back lining layer, a heat insulating layer (the heat insulating layer is a part of the back lining layer) arranged in order from the portion in contact with the hot metal. There is also a way of thinking).

  The wear lining layer is in contact with high-temperature hot metal and the deterioration of the refractory progresses. Therefore, the wear lining layer is used with repeated repairs, but its life is usually about one year.

  Also, since the back lining layer does not directly contact the hot metal, the deterioration progresses more slowly than the wear lining layer, and depending on the usage, the bottom side is used almost permanently, and the life on the side is normal. It is about 3 years.

  In the conventional blast furnace main body, the backlining layer is constructed with refractories such as alumina, alumina-spinel, silicon carbide, etc. on the inner side of the iron shell or heat insulation layer by bricks, precast blocks, pouring, etc. It is formed by doing.

  Wear lining layers tend to sinter and become more prone to cracking as they are used. In recent years, wear lining layers tend to be used until the remaining thickness decreases, and through the cracks in the wear lining layer that comes into contact with high-temperature hot metal, May reach the backlining layer. And the crack of the refractory material of a wear lining layer is easy to generate | occur | produce on the heel side surface (side surface side) rather than the bottom surface side.

The back lining layer may also crack due to repeated expansion and contraction due to heat transferred from the wear lining layer side.
If the hot metal reaching the back lining layer is inserted into a crack generated in the back lining layer, a serious accident such as leakage or leakage may occur.
And the crack of a back lining layer is easy to generate | occur | produce on the heel side rather than the bottom side similarly to the case of a wear lining layer.

  With regard to such a refractory lining of a blast furnace main pole, Patent Document 1 discloses that the above-mentioned wear is provided between a wear lining layer, which is a refractory material in contact with the molten metal of a blast furnace cast iron, and an iron skin that forms the outer frame of the pit. A refractory structure of a blast furnace cast iron with an alumina refractory layer, a heat-insulating brick layer, and an alumina charcoal brick layer arranged in order from the lining layer side is described. According to the invention of this Patent Document 1, by arranging refractories having different thermal conductivities between the wear lining layer and the iron shell, the thermal stress is alleviated as a whole and the durability as a whole is improved. It is said that it can be made.

  However, in this patent document 1, the back lining layer is made of alumina charcoal brick, heat insulating brick, and alumina casting (horizontal plane is alumina precast), and is composed of two layers of alumina charcoal brick and heat insulating brick. Since it is necessary to construct a brick layer and the time required for construction becomes very long, there is a problem that productivity is poor.

Further, in Patent Document 2, by disposing a precast block of 1 to 40% by weight of MgO and 55 to 98% by weight of Al ₂ O ₃ at least in the hot water contact part, construction defects due to on-site casting are eliminated, A blast furnace cast iron for desiliconization treatment that has a long life and stable operation has been proposed.

  According to this Patent Document 2, it is said that the back lining may be casted with an alumina castable, or may be preliminarily constructed with a spraying material or a ramming material on the iron skin (the specification and paragraph of the cited document 2). 0006). However, since there is no specific description in the configuration of the back lining layer and it is considered that it is a general single layer configuration, it is considered that cracks that occur in the back lining layer may reach the iron skin. It is done.

Further, Patent Document 3 discloses that, among permanent refractory (back lining) refractories, thermal conductivity is 2 W · in a portion corresponding to a height from a floor portion that is a sole to a position 150 mm higher than an average slag line. A blast furnace using a refractory with m ⁻¹ · K ⁻¹ or more has been proposed. In the case of the configuration of Patent Document 3, heat removal from the blast furnace is promoted, and the life of the work lining material is prolonged.
However, in the case of Patent Document 3 as well, there is no specific description regarding the configuration of the backlining refractory, and it is considered to be a general single layer configuration. It is thought that there is a risk that

Further, Patent Document 4 discloses that castable refractories having different compositions of SiC in the slag zone and the metal zone are used for the blast furnace main lining (back lining). According to the configuration, it is said that a highly reliable blast furnace main body having good hot metal resistance and hot weather resistance, excellent sinterability, and good durability.
However, in Patent Document 4, there is no specific description regarding the number of layers and the like of the lining structure of the back lining, and if it is a general single layer configuration, there is a possibility that the crack reaches the iron skin.

Moreover, regarding the refractory lining of the blast furnace main frame, an integrated blast furnace cast floor type as shown in Patent Document 5 has been proposed as a blast furnace main line intended to shorten the construction period.
That is, in Patent Document 5, a concrete block, a refractory heat insulating material (irregular refractory material), and a refractory material (side wall is a water-cooled disc or precast block, and the bottom portion is refractory brick) are laminated in order from the outside. An integrated monolithic blast furnace cast iron is described. In addition, it is described that an irregular refractory for firewood is disposed as the above-mentioned refractory heat insulating material.
Further, in Patent Document 5, the refractory material may be any one of a structure composed of one layer or two or more layers of a brick, an indeterminate refractory (including those by spraying construction), and a precast block (Patent Document). 5, paragraph 0022).
However, in the case of a blast furnace main shaft of a type in which the iron skin is fixed, the actual situation is that the method of Patent Document 5 that is integrated before construction cannot be adopted.

Moreover, in patent document 6, in the construction method of the hot metal used as the flow path of the hot metal discharged | emitted from a blast furnace, the side part unit which constructed the permanent tension material to the side plate and the side part steel of the hot metal, and the bottom plate, Each bottom unit made of bottom section steel is individually manufactured, and after the side unit is joined to the bottom unit, a permanent tension member is applied to the bottom unit, and the resulting structure is placed on the support beam. A method for constructing hot metal as described above has been proposed.
However, even in the case of Patent Document 6, there is no specific description in the configuration of the permanent tension member on the side surface side, and there is no special description in the method of constructing the permanent tension material on the side surface side. Since the permanent tension material is considered to have a general single-layer structure, there is a possibility that the cracks can easily reach the side plate and the side section steel, and the structure of the permanent tension material on the side surface side is plural, for example. When trying to make a layered structure, there is a problem that it takes time for construction.

Japanese Patent No. 3785449 JP-A-11-172308 JP 2003-183713 A JP 2004-099937 A JP 2004-323865 A JP 2009-167508 A

  The present invention solves the above-mentioned problem, and suppresses and prevents the penetration of cracks occurring in the backlining layer, and the blast furnace main body and the blast furnace main body can be constructed with a refractory material in a short time. The purpose is to provide a construction method.

In order to solve the above problems, the main blast furnace of the present invention (Claim 1) is:
A blast furnace chief formed by applying a refractory material inside the iron skin,
A wear lining layer in contact with the hot metal;
A back lining layer provided outside the wear lining layer,
Among the bottom side back lining layer and the side side back lining layer constituting the back lining layer, at least the side side back lining layer,
(a) a wet-sprayed refractory material layer located on the iron skin side;
(b) the located hot metal side of the wet spraying refractory material layer, together with and a different one or more layers of refractory material layer and the wet spraying refractory material layer,
A heat insulating layer is provided between the back lining layer and the iron skin .

The main blast furnace of the present invention is
A blast furnace chief formed by applying a refractory material inside the iron skin,
A wear lining layer in contact with the hot metal;
A back lining layer provided outside the wear lining layer;
With
Among the bottom side back lining layer and the side side back lining layer constituting the back lining layer, at least the side side back lining layer,
(a) a wet-sprayed refractory material layer located on the iron skin side;
(b) one or more refractory material layers different from the wet spray refractory material layer, located on the hot metal side of the wet spray refractory material layer;
With
The wet sprayed refractory material layer is supported by a first stud, and one or more refractory material layers different from the wet sprayed refractory material layer are supported by a second stud.
It is characterized by.

  Moreover, in the blast furnace main board of this invention provided with the heat insulation layer, it is desirable that the said heat insulation layer is supported by the 3rd stud.

Moreover, the construction method of the blast furnace main shaft of the present invention is as follows:
A method for constructing a blast furnace chief according to any one of claims 1 to 3 ,
Forming the side-side backlining layer,
(a) a step of forming the wet sprayed refractory material layer by wet spraying the refractory material;
(b) One or more refractory material layers different from the wet spray refractory material layer are formed by applying the refractory material at least once on the wet spray refractory material layer formed in the step. Process,
It is characterized by having.

  In the blast furnace main board of the present invention, among the backlining layers, at least the side-side backlining layer is (a) a wet-blasting refractory material layer located on the iron skin side, and (b) a wet-blasting refractory material layer. Since one or more refractory material layers different from the wet spray refractory material layer are located on the hot metal side (that is, the back lining layer has a multi-layer structure), it occurs in the back lining layer. It is possible to suppress or prevent the cracks from penetrating through the iron skin.

In addition, the wet spraying refractory material layer located on the iron skin side can be efficiently constructed by the wet spraying method. For example, part or all of the side-side backlining layer is constructed by the brick building method. Compared with the case where it does, it becomes possible to construct in a short time.
Therefore, according to the present invention, it is possible to obtain a blast furnace main body capable of suppressing and preventing the penetration of cracks occurring in the back lining and capable of being constructed in a short time.

  Moreover, the 1st stud and 2nd stud which support each one or more refractory material layers which are different from the wet spraying refractory material layer and wet spraying refractory material layer which comprise a side surface side lining layer, respectively By supporting by, it can prevent reliably that each layer peels and opens, and can improve reliability more.

Further, the reliability can be further improved by supporting the heat insulating layer by the third stud.

It is sectional drawing which shows typically the structure of the main furnace of the blast furnace concerning one Embodiment of this invention.

  Embodiments of the present invention will be described below to describe the features of the present invention in more detail.

  The blast furnace main board of the present invention is a wet spray refractory in which at least the side surface side lining layer of the bottom surface side back lining layer and the side surface side lining layer constituting the back lining layer of the blast furnace main body is located on the iron skin side. By forming a multi-layer structure including one or more refractory material layers different from the above-mentioned wet spray refractory material layer, located on the hot metal side of the material layer and the wet spray refractory material layer, the back lining layer The cracks that occur are suppressed and prevented from penetrating to the iron skin, thereby preventing leakage.

  In addition, among the refractory material layers of the multi-layer structure constituting the side-side back lining layer, at least one layer located on the iron skin side is constructed by the wet spraying method, so it can be easily and poured It is possible to form a backlining layer having high strength and corrosion resistance comparable to that of a casting material in a short time compared with construction and brick building construction.

  Of the back lining layer, the part constituting the bottom side (bottom side back lining layer) is easier to construct than the side part and is used permanently, For example, an alumina-siliceous brick may be applied to the bottom-side backlining layer, since a little longer time is not a problem.

Also, blast furnace main trough of the present invention further between the back lining layer and the steel shell, a heat insulating layer (e.g., layers of refractory material and construction by a dry spraying method) Rukoto features desirable.

Therefore, the blast furnace main trough of the present invention, for example, those of the following configurations in Configuration Example 1].
[Configuration example 1]
a) a wear lining layer in contact with the hot metal;
b) A back lining layer provided on the outer side of the wear lining layer, wherein at least the side-side back lining layer is a wet-sprayed refractory material layer located on the iron skin side, and a hot metal side of the wet-spray refractory material layer A backlining layer comprising one or more refractory material layers different from the wet spray refractory material layer,
c) a heat insulating layer disposed outside the back lining layer;
d) A blast furnace head with an outermost layer of iron skin.

FIG. 1 is a diagram schematically showing a typical configuration of a blast furnace main board according to an embodiment of the present invention.
As shown in FIG. 1, the blast furnace head includes a wear lining layer 10 in contact with the hot metal 50, a back lining layer 20 provided outside the wear lining layer 10 (on the iron skin 40 side), and a back lining layer 20. The heat insulation layer 30 provided in the outer side (iron skin 40 side) and the iron skin 40 which is the outermost layer are provided.
The back lining layer 20 includes a side surface side lining layer 21 disposed on the side surface side of the iron skin 40 and a bottom surface side back lining layer 22 disposed on the bottom surface side of the iron skin 40.

  The side-side backlining layer 21 includes a wet-sprayed refractory material layer (hereinafter also referred to as “first refractory material layer”) 21a, which is located on the iron skin 40 side and is constructed by a wet-spray method. One or more (one in this embodiment) refractory material layers (hereinafter referred to as “second refractory material layer”) different from the wet spray refractory material layer 21a, located on the hot metal 50 side of the attached refractory material layer 21a. 21b). In this embodiment, the refractory material layer (second refractory material layer) 21b different from the wet spray refractory material layer 21a is a cast refractory material layer formed by pouring a refractory material kneaded with water.

  Further, the bottom side backlining layer 22 is formed on the lower layer side refractory material layer 22a and the lower layer side refractory material layer 22a, which are formed by applying an alumina-silica brick located on the bottom surface side of the iron skin 40. The lining layer has a two-layer structure including an upper-layer refractory material layer 22b formed by applying an alumina-silica-silicon carbide brick.

  Further, there is no particular restriction on the type of refractory material constituting the wear lining layer 10, but, for example, cast-fire refractory in which an alumina-SiC-carbon-based refractory material is cast and applied to a thickness of about 500 mm, for example. A material is used. In addition, the wear lining layer may have a multilayer structure in which different materials are applied in the slag zone and the metal zone.

  Moreover, there is no restriction | limiting in particular in the kind of refractory material which comprises the heat insulation layer 30, and a construction method, For example, the thickness is made by well-known construction methods, such as pouring and spraying, of an alumina or an alumina-silica refractory material. It can be constructed to be about 100 mm to form a heat insulating layer. In addition, considering the low cost and low bulk specific gravity (reducing construction weight), etc., the heat insulating layer is formed by applying an alumina-silica heat insulating refractory material by a dry spraying method, etc. Is a particularly preferred example.

Moreover, the wet spraying refractory material layer 21a located on the iron skin side, which constitutes the above-described side-side backlining layer 21, is constructed by a wet spraying method. In constructing the material layer 21a, specifically, for example, a method as described below is performed.
That is, in constructing the wet spraying refractory material layer 21a located on the iron skin 40 side by the wet spraying method,
(a) silicon carbide, alumina, bauxite, van earth shale, kyanite, mullite, silica flower, clay, rholite, silica, spinel, magnesia, zircon, zirconia, chromium ore, calcia, iron silicon nitride, boron carbide, A refractory powder (80 to 98% by weight) selected from graphite, pitch, coke, pitch pellets, bentonite, hydrous amorphous silica, anhydrous amorphous silica, and the like;
(b) 2-20% by weight of a binder such as alumina cement;
(c) The kneaded material kneaded with 3 to 20% by weight of water on the outside is pumped with high-pressure air in the piping using a pumping machine such as a piston pump, squeeze pump or screw pump. Then, in the spray nozzle attached to the end of the pipe, it is mixed with the flocculant sent by the compressed air and sprayed to construct the wet sprayed refractory material layer 21 a on the heat insulating layer 30.

  In addition, as the refractory powder constituting the wet-sprayed refractory material layer 21a, aluminum powder, aluminum alloy powder, silicon powder, foaming agent, metal fiber, organic fiber, ceramic fiber are generally used as necessary. A dispersant may be added.

  In the present invention, various materials can be used as described above as the material constituting the wet-sprayed refractory material layer 21a. However, considering hot metal resistance, blast furnace slag resistance, and the like, Particularly preferred refractory materials include alumina-silica and alumina-silicon carbide, which are excellent in them.

  Moreover, although the thickness of the wet spraying refractory material layer (1st refractory material layer) 21a formed with a wet spraying method is based also on the magnitude | size of the whole main body of a blast furnace, it is preferable to set it as the range of 100 mm-300 mm. . If it is thinner than 100 mm, there is a possibility that the hot metal 50 will easily reach the iron skin 40. If it exceeds 300 mm, the wet sprayed refractory material layer (first refractory material layer) 21a Since the case where the thickness of the 2nd refractory material layer 21b formed in this cannot fully be ensured arises, it is not preferable.

The material and construction method of the second refractory material layer 21b formed on the wet sprayed refractory material layer (first refractory material layer) 21a are not particularly limited, and alumina, alumina-silica, or alumina-silicon carbide is not particularly limited. A high quality refractory material can be formed into a single layer or a plurality of layers by a known method such as pouring, dry spraying or wet spraying.
The second refractory material layer 21b formed on the first refractory material layer 21a is poured and applied with an alumina-silicon carbide refractory material from the standpoint of excellent balance between slag resistance and hot metal resistance. It is preferable that the cast refractory material layer be formed.

  Moreover, although the thickness of the 2nd refractory material layer 21b formed on the 1st refractory material layer 21a is based also on the magnitude | size of the whole ridge, it is preferable to set it as the range of 100 mm-600 mm. This is because when the thickness of the second refractory material layer 21b is less than 100 mm, it cannot sufficiently withstand long-term use as a permanent tension, and when it exceeds 600 mm, the amount of refractory material used is too large. This is because it is too much and the cost is high.

  In addition, the area | region within the predetermined distance (for example, 400 mm) from the upper end of the side surface side lining layer 21 exists in the position higher than the liquid level of the hot metal 50 which flows through a blast furnace main pole (namely, the wear lining layer 10 is in the hot metal 50). Therefore, the area has a multi-layer structure of a first refractory material layer that is a wet spray refractory material layer and a second refractory material layer that is a cast refractory material layer. Instead, the back lining layer 21 has a single-layer structure including only the second refractory material layer (cast-in refractory material layer) 21b, thereby simplifying the manufacturing process. However, it is needless to say that a two-layer structure of a first refractory material layer and a second refractory material layer may be used as in the other regions.

  Further, in the blast furnace main board of this embodiment, each side, that is, the wet spraying refractory material layer 21a applied by the wet spraying method, and the pouring method were applied to the side-side backlining layer 21. It is desirable to install a stud that supports the second refractory material layer. Also in the main blast furnace of this embodiment, the first refractory material layer 21a is supported by the first stud S1, and the second stud S2 is the second. The refractory material layer 21b is supported.

  Note that, as described above, in the side-side back lining layer 21, the region from the upper end to a predetermined distance (for example, 400 mm) has a single-layer structure including only the second refractory material layer (cast-in refractory material layer) 21b. In this case, in the region from the upper end to a predetermined distance (for example, 400 mm), the second refractory material layer 21b can be configured to be supported by the second stud S2.

  Further, in the case where a heat insulating layer is provided between the iron skin 40 and the first refractory material layer 21a constructed by the wet spraying method, it is preferable to install a stud that supports the heat insulating layer 30, Also in the main furnace of this embodiment, the heat insulating layer 30 is supported by the third stud S3.

  For the purpose of reliably supporting each refractory material layer and preventing the opening between each refractory material layer and between the heat insulation layer and the iron shell, as described above, the first stud S1, the second stud S2, It is desirable to support the first refractory material layer 21a, the second refractory material layer 21b, and the heat insulation layer 30 by using the third stud S3.

  However, the method of integrally supporting each refractory material layer using studs penetrating all the refractory material layers tends to have an insufficient function to prevent the opening between each refractory material layer, and the construction is complicated. Therefore, it is not preferable.

  In addition, although the material and shape of a stud are not specifically limited, As a stud which can be used suitably, a Y-type stud etc. are mentioned, for example.

  Hereinafter, examples of the present invention will be shown and the features thereof will be described in more detail.

In this example, a blast furnace main board having a structure as shown in FIG. 1 was produced by the method described below.
First, the heat insulation layer 30 was constructed to the iron skin 40 which comprises a blast furnace main pole. Then, an alumina-silica brick is applied on the heat insulating layer 30 on the bottom surface side of the iron skin 40 to form the lower refractory material layer 22a, and the alumina-silica-silicon carbide on the lower refractory material layer 22a. Brick was applied to form the upper refractory material layer 22b to form the bottom side backlining layer 22 having a two-layer structure.

  Then, on the heat insulating layer 30 on the side surface side of the iron skin 40, the refractory material is wet sprayed to form the wet spray refractory material layer (first refractory material layer) 21a, and the refractory material is poured and applied. The side-side back lining layer 21 having a two-layer structure was formed by forming a cast refractory material layer (second refractory material layer) 21b.

  Then, an alumina-SiC-carbon refractory material having a thickness of 500 mm is formed on the backlining layer 20 including the side-side backlining layer 21 and the bottom-side backlining layer 22 formed as described above. The blast furnace main board of Example 1 of Table 1 was produced by casting and forming the wear lined layer 10.

  In this example, as described in the above embodiment, the first stud S1 that supports the wet spraying refractory material layer (first refractory material layer) 21a constructed by the wet spraying method and the pouring method are used. A blast furnace main board provided with a second stud S2 supporting the cast refractory material layer (second refractory material layer) 21b to be constructed and a third stud S3 supporting the heat insulating layer 30 was produced. In addition, as stud S1, S2, S3, all used the Y-type stud.

For comparison,
(a) A heat-insulating layer and a poured refractory material layer (second refractory material layer) are provided, but a wet-blast refractory material layer (first refractory material layer) is provided, and a side-side back lining layer is provided. Blast furnace main board of Comparative Example 1 (that is, a blast furnace main board having a single-sided side lining layer)
(b) A blast furnace main board of Comparative Example 2 having a two-layer side-side backlining layer composed of a heat insulating layer and two cast refractory material layers (cast refractory material layer 1 and cast refractory material layer 2);
(c) A blast furnace main board of Comparative Example 3 having a two-layer side-side backlining layer composed of a heat insulating layer and two brick layers (brick layer 1 and brick layer 2) was produced.

In addition, the construction method of each refractory material is as follows.
(A) Construction method of heat insulation layer The fireproof material was constructed to a thickness of 100 mm by a dry spraying method.
(B) Construction method of wet spray refractory material layer (first refractory material layer) When producing the main blast furnace of Example 1 in Table 1, the wet spray refractory material layer constituting the side-side back lining layer ( In constructing the first refractory material layer), a refractory material was sprayed onto the region below 400 mm from the top by a wet spraying method so that the thickness was 150 mm.
(C) Method for constructing the cast refractory material layer When constructing the cast refractory main layer of Example 1 and Comparative Examples 1 and 2, when constructing the cast refractory material layer, frame the frame and add water to the refractory material. After adding and pouring, the mixture was cured at ambient temperature for 12 hours.
(D) Construction method of brick layer In Comparative Example 3, when forming the brick layer constituting the side-side backlining layer, the bricks constituting the following first and second brick layers were made of alumina mortar. It was constructed by bonding.

The composition of the refractory material used for the heat insulating layer and the side surface side lining layer in the blast furnace main body of this example is as follows.
(1) Heat insulation layer: Al ₂ O ₃ 38%, SiO ₂ 44%
(2) Wet spray refractory material layer: Al ₂ O ₃ 65%, SiO ₂ 31%
(3) Other refractory material layers (cast refractory material layers)
(a) Cast refractory material layer 1
: Al ₂ O ₃ 74%, SiO ₂ 8%, SiC 15%
(b) Cast refractory material layer 2
: Al ₂ O ₃ 78%, SiO ₂ 4%, SiC 15%
(c) Brick layer 1
: Al ₂ O ₃ 55%, SiO ₂ 44%
(d) Brick layer 2
: Al ₂ O ₃ 46%, SiO ₂ 30%, SiC 22%

In producing each blast furnace main board as described above, the construction time of the side-side back lining layer was examined.
Table 1 shows the results.
In addition, the construction time in Table 1 is the time (total time) required to construct both the side-side heat insulating layer and the side-side backlining layer.

Moreover, the blast furnace main pole of Example 1 and the blast furnace main pole of Comparative Examples 1, 2, and 3 produced as described above were used in an actual furnace for one year.
After one year of use, the presence or absence of through cracks reaching the iron skin and the presence or absence of separation (peeling) between layers were examined.
The results are also shown in Table 1.

  As shown in Table 1, when the side-side back lining layer is the main furnace of Example 1 with the requirements of the present invention, the construction time of the side-side heat insulating layer and the side-side back lining layer is as short as 36 hours, In addition, it was confirmed that no through cracks were observed and no opening between layers occurred.

  On the other hand, in the case of the blast furnace main board of Comparative Example 1 in which the side-side back lining layer does not include the wet-sprayed refractory material layer and has a single-layer structure composed only of the cast refractory material layer, The construction time of the side-side back lining layer was short, and there was no opening between each layer, but it was confirmed that a through crack occurred and there was a problem in practical use.

  Further, in the case of the main blast furnace of Comparative Example 2 in which the side-side back lining layer has a two-layer structure including the first and second cast refractory material layers, no through cracks were observed. It was confirmed that not only it took a long time to construct the layer and the side-side backlining layer, but also an opening between the layers occurred, which was not preferable.

  Further, in the case of the main blast furnace of Comparative Example 3 in which the side-side back lining layer has a two-layer structure including the brick layer 1 and the brick layer 2, as in the case of the main blast furnace of Comparative Example 2, the through crack However, it was confirmed that not only it took a long time to construct the side-side heat insulating layer and the side-side back lining layer, but also an opening between the layers occurred, which was not preferable.

  The main blast furnace of Example 1 has a structure including a heat insulating layer. However, in the case of a structure not including a heat insulating layer, the requirements of the present invention (that is, the side-side backlining layer is made of iron Wet refractory material layer (first refractory material layer) located on the side and one or more refractory material layers different from the first refractory material layer located on the hot metal side of the wet spray refractory material layer (first refractory material layer) 2), as in the case of the blast furnace main board of Example 1 above, a blast furnace main board that is unlikely to cause through cracks and opening between layers can be obtained. It has been confirmed.

  In addition, the kind and composition of the refractory constituting the main blast furnace of the present invention, the dimensions of each part, etc. are not limited to the above embodiment and examples, and can be changed within the scope of the invention. .

  The present invention is not limited to the above-described embodiments and examples in other points, and various applications and modifications can be added within the scope of the invention.

DESCRIPTION OF SYMBOLS 10 Wear lining layer 20 Back lining layer 21 Side surface side lining layer 21a Wet spray refractory material layer (1st refractory material layer)
21b Refractory material layer different from the first refractory material layer (second refractory material layer)
22 Bottom side lining layer 22a Lower side refractory material layer 22b Upper side refractory material layer 30 Heat insulation layer 40 Iron skin 50 Hot metal S1 First stud
S2 2nd stud S3 3rd stud

Claims (4)

A blast furnace chief formed by applying a refractory material inside the iron skin,
A wear lining layer in contact with the hot metal;
A back lining layer provided outside the wear lining layer,
Among the bottom side back lining layer and the side side back lining layer constituting the back lining layer, at least the side side back lining layer,
(a) a wet-sprayed refractory material layer located on the iron skin side;
(b) the located hot metal side of the wet spraying refractory material layer, together with and a different one or more layers of refractory material layer and the wet spraying refractory material layer,
A blast furnace main board comprising a heat insulating layer between the backlining layer and the iron skin . A blast furnace chief formed by applying a refractory material inside the iron skin,
A wear lining layer in contact with the hot metal;
A back lining layer provided outside the wear lining layer;
With
Among the bottom side back lining layer and the side side back lining layer constituting the back lining layer, at least the side side back lining layer,
(a) a wet-sprayed refractory material layer located on the iron skin side;
(b) one or more refractory material layers different from the wet spray refractory material layer, located on the hot metal side of the wet spray refractory material layer;
With
Blast furnace main , wherein the wet sprayed refractory material layer is supported by a first stud, and one or more refractory material layers different from the wet sprayed refractory material layer are supported by a second stud. 樋 . Wherein the heat insulating layer is supported by a third stud, blast furnace main trough of claim 1 wherein. A method for constructing a blast furnace chief according to any one of claims 1 to 3 ,
Forming the side-side backlining layer,
(a) a step of forming the wet sprayed refractory material layer by wet spraying the refractory material;
(b) One or more refractory material layers different from the wet spray refractory material layer are formed by applying the refractory material at least once on the wet spray refractory material layer formed in the step. Process,
A method for constructing a blast furnace main boss characterized by comprising:

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