JP2013040721A - Drying method of lining - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drying method of a lining, which can further prevent explosive breakage compared with a conventional technology, specifically which can suppress and prevent the explosive breakage at the drying of a wear refractory constituted of a pour-in castable refractory.SOLUTION: There is provided the drying method of the lining 15 which is arranged on the surface of an iron membrane 11, and on which the wear refractory 12, a first permanent refractory 13 and a second permanent refractory 14 are arranged in this order from a side at which the lining contacts with molten metal toward the side of the iron membrane 11. The wear refractory 12 is constituted of the pour-in castable refractory which is obtained by being kneaded with water and whose thickness is ≤190 mm, the first permanent refractory 13 is constituted of a shaped refractory whose thickness is ≥30 mm and ≤65 mm, and a heat insulating material 16 whose heat transmittance obtained by dividing heat conductivity with the thickness is ≤30 W/(mK) is arranged between the first permanent refractory 13 and the second permanent refractory 14, thus heating and drying the lining 15 from the side of the wear refractory 12.

Description

The present invention relates to a method for drying a lining applied to, for example, a molten metal container or a jar.

Conventionally, for example, a refractory is lined on the furnace inner side (molten steel contact surface side) of a molten metal container for iron making. In using this molten metal container, it is necessary to dry the refractory in advance, but there is a problem that the refractory explodes during this drying.
For this reason, the search of the drying method for preventing the explosion of a refractory has been performed conventionally.
On the other hand, for example, Patent Documents 1 and 2 describe examples of efforts to reduce heat dissipated from the iron skin by arranging a heat insulating material between the lined refractory and the iron skin.
Patent Document 3 describes a method of shortening the drying time of the wear refractory by disposing a heat insulating material between the wear refractory and the permanent refractory constituting the lined refractory.

JP 2010-266103 A JP 2010-248563 A Japanese Patent Laid-Open No. 10-206031

However, Patent Documents 1 and 2 are based on the premise that a fixed refractory is used instead of an irregular refractory for the wear refractory and the permanent refractory constituting the lined refractory.
In addition, in Patent Document 1, it is described that an amorphous refractory can be applied as a wear refractory. However, when estimated from the thermal conductivity (15 W / (m · K) or more) of Examples, the amorphous refractory is It is unlikely that you are using it. Patent Document 1 describes a C-containing wear refractory, but since C is hydrophobic, it generally requires a large amount of kneaded water, resulting in a high porosity. Thus, it is difficult to obtain a thermal conductivity of 15 W / (m · K) with an irregular refractory, and it can be seen that this is an example using a regular refractory.
From the above, in Patent Documents 1 and 2, it is considered that C-containing non-fired shaped refractories are used. However, drying of unfired shaped refractories is caused by volatilization caused by the resin responsible for shape retention. The purpose is to remove the minute, and the risk of explosion is small compared to drying before using the amorphous refractory containing water (before pouring the molten metal).

Patent Document 3 describes a moisture removal temperature (in this case, 350 ° C.) on the back surface of the wear refractory as an index for preventing explosion of the wear refractory composed of an irregular refractory. That is, if the temperature of the wear refractory is raised to this moisture removal temperature, there is no fear of explosion of the wear refractory when the temperature rises thereafter, and there is a certain explosion prevention effect. However, if the temperature difference in the thickness direction of the wear refractory, that is, the temperature gradient (° C./mm) increases, the wear refractory may explode during drying due to this temperature gradient. No measures have been taken. Note that Patent Document 3 describes cracking and peeling during actual use (actual use) as problems, and does not address explosion due to water evaporation during drying at about 100 ° C., for example.
In the example of Patent Document 3, an invention example and a conventional example of wear refractories having different thicknesses are described (invention example: 200 mm, conventional example: 230 mm), but the back surface temperature at which water vapor is generated is close to 100 ° C. Since the temperature gradient of the wear refractory is larger in the example of the invention, the explosion prevention effect by reducing the temperature gradient cannot be obtained. Specifically, in FIG. 3, the temperature difference between the operating surface and the back surface of the ware refractory at a dehydration completion temperature (no steam pressure) of 110 ° C. is considered to be about 120 ° C. Since the thickness is 200 mm, the temperature gradient is 0.60 ° C./mm, and since the thickness of the conventional example is 230 mm, the temperature gradient is 0.52 ° C./mm.
In this case, even if the drying time can be shortened and cracking or peeling during actual use can be prevented, explosion due to water evaporation may occur during drying.

In general, for example, when an amorphous refractory is used as a wear refractory for a molten metal container, drying is performed to remove moisture in the amorphous refractory before use (before pouring the molten metal). The drying process for performing the drying is performed after a series of refractory construction work for the molten metal container is completed. In other words, the drying process is the final process before receiving the molten metal, and once an irregular refractory explosive trouble occurs, construction of the irregular refractory (rework or rework after dismantling) is required again. Compared to the case where no trouble occurs, the construction period of the refractory is greatly extended.
For this reason, in some cases, the production opportunity is lost and the influence is great.

The present invention has been made in view of such circumstances, to prevent explosion more than the prior art, specifically, to suppress the explosion at the time of drying ware refractory made of cast amorphous refractory, Furthermore, it aims at providing the drying method of the lining which can be prevented.

The method for drying a lining according to the present invention in line with the above object is arranged on the surface of the iron skin, and from the side in contact with the molten metal toward the iron skin side, the wear refractory, the first permanent refractory, the second In the drying method of the lining formed in the order of permanent refractories,
The wear refractory is composed of an indeterminate cast refractory having a thickness of 190 mm or less obtained by kneading with water, the first permanent refractory is composed of a regular refractory having a thickness of 30 mm to 65 mm, and A heat insulating material having a heat conductivity divided by a thickness of 30 W / (m ² · K) or less is disposed between the first permanent refractory and the second permanent refractory, and the lining Is heated from the ware refractory side and dried.

In the lining drying method according to the present invention, it is preferably applied to the furnace wall of the molten metal container.

The method for drying a lining according to the present invention defines the thickness of a first permanent refractory composed of a ware refractory and a fixed refractory, when poured into a ware refractory and using an amorphous refractory, Between the first permanent refractory and the second permanent refractory, a heat insulating material having a heat transmission rate of 30 W / (m ² · K) or less is arranged, and the lining is heated and dried from the ware refractory side. Therefore, there is no deterioration of the performance of the heat insulating material, and it becomes possible to reduce the temperature gradient within the thickness of the wear refractory during drying (thickness direction).
As a result, a rapid increase in water vapor pressure during drying can be avoided, and explosion of the wear refractory composed of the cast amorphous refractory can be suppressed and further prevented.

In addition, when applying the drying method of the lining to the furnace wall of the molten metal container, the heat insulating material deteriorates in the heat insulating performance due to the weight of the wear refractory material and the first permanent refractory material that are installed inside the molten metal container furnace from the heat insulating material. Therefore, the effect of the present invention can be obtained more remarkably.

It is a sectional side view of the furnace wall structure of the molten metal container to which the drying method of the lining which concerns on one embodiment of this invention is applied. It is explanatory drawing which shows the influence which the temperature gradient in a wear irregular refractory has on the presence or absence of explosion trouble generation | occurrence | production.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
First, after describing a molten metal container to which a lining drying method according to an embodiment of the present invention is applied, a lining drying method will be described.
As shown in FIG. 1, the molten metal container 10 is disposed on the furnace inner surface (inner surface) of the iron skin 11, from the operating surface side (furnace inner side) in contact with the molten metal toward the iron skin 11 side (furnace outer side), The garment refractory 12, the first permanent refractory (surface-side refractory) 13, and the second permanent refractory (back-side refractory) 14 are formed in this order, and the first permanent refractory The heat insulating material 16 is arrange | positioned between the thing 13 and the 2nd permanent refractory 14, and the lining 15 is heated and dried from the wear refractory 12 side (furnace inside). Examples of the molten metal container include a converter, a hot metal ladle, a molten steel pan, and an electric furnace.

The first and second permanent refractories 13, 14 are regular fired bricks, that is, regular refractories.
The material of the fixed refractory is not particularly limited, but the permanent refractory may contact the high-temperature melt when the ware refractory melts and peels off. High wax stones and alumina are common.
The wear refractory 12 is a cast amorphous refractory obtained by kneading with water at room temperature (hereinafter also simply referred to as an irregular refractory).
Examples of the component system of this amorphous refractory include, for example, magnesia-lime, alumina-magnesia, alumina-spinel, alumina-silica, siliceous, alumina-silicon carbide, clay, etc. It is not limited. In addition, the curing method of the amorphous refractory is not limited to hydraulic properties using a hydration reaction like alumina cement, and may be any of, for example, chemical curing properties, thermosetting properties, and pneumatic properties, and is not particularly limited. Absent.

In the prior art described above, it is possible to insulate various industrial kilns, reduce the iron skin temperature, and shorten the drying time. However, when applying the conventional technology, the following problems to be improved have been newly found.
Explosion of a wear refractory made of a cast amorphous refractory during drying occurs due to a change in vapor pressure when water vapor passes through the thickness of the wear refractory. In particular, when water vapor passes from the low temperature (back surface) side to the high temperature (working surface or surface) side of the wear refractory, the vapor pressure rises along with the temperature gradient, and the vapor pressure increases. Explosion occurs when the wear refractory strength is exceeded. It should be noted that the moisture content of the cast amorphous refractory before drying (during construction) is, for example, 4% by mass or more and 9% by mass or less (in addition to the refractory material constituting the cast amorphous refractory, The lower limit is about 6% by mass and the upper limit is about 7% by mass) (the same applies hereinafter).
Therefore, in order to prevent explosion of the wear refractory during drying, it is desirable to reduce the temperature gradient of the wear refractory.

In order to obtain a desired temperature gradient of the wear refractory, selection of the thickness of the wear refractory 12 and the first permanent refractory 13 and the arrangement position of the heat insulating material 16 and its heat transmission rate (also referred to as heat transmittance) Becomes important.
Therefore, first, the thickness of the wear refractory 12 is set to 190 mm or less.
Here, when the thickness of the wear refractory exceeds 190 mm, the thickness becomes too thick, and the irregular refractory constituting the wear refractory increases the temperature gradient in the thickness direction of the wear refractory and can prevent explosion. The temperature gradient (for example, 0.5 ° C./mm or less) is exceeded. On the other hand, the lower the thickness of the wear refractory, the smaller the temperature gradient of the wear refractory and the greater the effect of preventing explosion, so there is no lower limit, but considering the refractory life of the molten metal container, it exceeds 100 mm. Is common (effective remaining thickness: 40 to 50 mm).
Therefore, although the thickness of the wear refractory 12 is 190 mm or less, it is preferably 180 mm or less.

As described above, the component system of the amorphous refractory constituting the ware refractory is not particularly limited, but when using an amorphous refractory containing carbon as the ware refractory, The effect of the invention, that is, the effect of preventing the explosion of the wear refractory is diminished. This amorphous refractory containing carbon has a high thermal conductivity of the amorphous refractory itself, so that the temperature gradient in the amorphous refractory is reduced.
Further, the effect of preventing the explosion of the wear refractory is remarkably obtained when using an amorphous refractory having a thermal conductivity of 10 W / (m · K) or less. The lower limit of the thermal conductivity of the amorphous refractory is, for example, about 0.1 W / (m · K) in consideration of the thermal conductivity of the amorphous refractory existing in the world.

Further, the thickness of the first permanent refractory 13 is set to 30 mm or more and 65 mm or less.
Here, when the thickness of the permanent refractory is less than 30 mm, there is a problem that the thickness becomes too thin and the function as the refractory may be impaired, and the manufacture of the refractory becomes difficult. On the other hand, if the thickness of the permanent refractory exceeds 65 mm, the thickness becomes too thick, impairing the function of the heat insulating material, and the temperature gradient of the wear refractory exceeds the temperature gradient that enables explosion prevention.
Therefore, within the range in which a refractory capable of maintaining the function can be manufactured, the distance from the back surface of the wear refractory 12 to the surface of the heat insulating material 16 is shortened, that is, the thickness of the first permanent refractory 13 is reduced to prevent explosion. In order to ensure a possible temperature gradient, the thickness of the first permanent refractory 13 was set to 30 mm to 65 mm. However, by setting the permanent refractory to a thickness at which explosion is likely to occur, for example, 40 mm or more, and further 45 mm or more, the effect of preventing the explosion of the refractory can be obtained more remarkably.

As described above, the heat insulating material 16 is disposed between the first permanent refractory 13 and the second permanent refractory 14.
Insulation materials generally have poor thermal insulation properties when in contact with water, so placing them in direct contact with an amorphous refractory containing water, i.e., between a ware refractory and a first permanent refractory, Should be avoided. Moreover, even if it arrange | positions a heat insulating material between an iron shell and a 2nd permanent refractory, the explosion prevention effect of a wear refractory cannot be acquired.
From the above, the heat insulating material 16 was disposed at the position described above.
In addition, the material which comprises a heat insulating material is the fibrous material which has glass, a silica, an alumina etc. as a main component, the inorganic substance which has a microporous structure, etc., for example. The heat insulating material is preferably in the form of a sheet (plate) having a uniform thickness, and its thermal conductivity is preferably 0.15 W / (m · K) or less at room temperature. An example of such a heat insulating material is “Porextherm WDS (registered trademark)” manufactured by Porextherm Damstoff GmbH. The material is a microporous molded body mainly composed of fumed silica, and the thermal conductivity is 0.021 W / (m · K).

The heat passage rate of the heat insulating material 16 is 30 W / (m ² · K) or less. The heat passage rate is a value obtained by dividing the thermal conductivity by the thickness (= thermal conductivity / thickness).
Here, when the heat passage rate of the heat insulating material exceeds 30 W / (m ² · K), the heat passage rate becomes too large, and the temperature gradient of the wear refractory exceeds the temperature gradient that enables explosion prevention. .
On the other hand, the lower the heat transfer rate of the heat insulating material, the smaller the temperature gradient of the ware refractory and the greater the effect of preventing explosions. Therefore, a lower limit is not provided, but in general, 2 W / (m ² · K) is considered to be a feasible limit. If a heat insulating material with a small thermal conductivity is applied thickly, the heat transmission rate approaches zero without limit. For example, from the viewpoint of the internal volume of the molten metal container and the stability of the structure, {thermal conductivity 0.02 W / It is assumed that the lower limit is about (m · K)} / {thickness 0.01 m (10 mm)} = 2 W / (m ² · K).
Therefore, although the heat passage rate of the heat insulating material 16 is 30 W / (m ² · K) or less, it is preferably 25 W / (m ² · K) or less, more preferably 20 W / (m ² · K) or less.

Although the application part of the lining structure shown above is not specifically limited, It is desirable to apply to the furnace wall (side wall) of a molten metal container. This means that the desired effect can be obtained without the heat insulation material being deteriorated in heat insulation performance due to the weight of the refractory to be installed inside the furnace from the heat insulation material, that is, the wear refractory material 12 and the first permanent refractory material 13. by.
On the other hand, when the lining structure is applied to the furnace bottom (laying part), the weight of the refractory applied to the inside of the furnace from the heat insulating material exceeds the compressive strength of the heat insulating material, and the pore structure of the heat insulating material is destroyed. It causes a decrease and the desired effect is reduced. However, since there is an effect of preventing explosion, a lining structure may be used at the bottom of the furnace.
In addition, the lining structure is preferably applied to the entire furnace wall and / or the bottom of the molten metal container, but may be partially installed only in a part where an effect of preventing explosion is obtained.

Next, a lining drying method according to an embodiment of the present invention will be described with reference to FIG.
First, a large number of cuboid second permanent refractories 14 are lined on the furnace inner surface of the iron skin 11 without gaps through joints.
Next, the sheet-like heat insulating material 16 is bonded to the furnace inner surface of the second permanent refractory 14 lined so that no gap is formed between the adjacent heat insulating materials 16. This heat insulating material 16 is one in which either or both of the thermal conductivity and the thickness are adjusted such that the heat passage rate is 30 W / (m ² · K) or less.

A large number of first permanent refractories 13 are lined on the furnace inner surface of the heat insulating material 16 bonded to the surface of the second permanent refractory 14 without any gaps. In addition, the 1st permanent refractory 13 is adjusted in the range whose thickness is 30 mm or more and 65 mm or less.
Further, a wear refractory 12 is disposed on the furnace inner surface of the first permanent refractory 13 lined. The wear refractory 12 is a cast amorphous refractory kneaded with water (water content: about 4 mass% or more and about 9 mass% or less), and the thickness is adjusted to 190 mm or less during construction.
In this manner, the wear refractory 12, the first permanent refractory 13, the heat insulating material 16, and the second permanent refractory 14 are arranged in this order from the furnace inner side to the furnace outer surface on the furnace inner surface of the iron skin 11. Then, this lining 15 is heated and dried from the furnace inner side (wear refractory 12 side).

Here, as a heating method that can be used for drying, for example, there is a method of supplying a heat source in one direction or concentric circles such as burner heating, hot air heating, hot air heating, radiant heating (radiant tube), and the like. The method is not particularly specified. When heating is performed, a method using a lid that can accurately follow a predetermined temperature rising pattern and can cover the open top portion of the molten metal container is generally used.
The heating rate that can be achieved by these heating methods, specifically, when the drying surface of a ware refractory that is an irregular refractory is heated from 100 ° C. to 200 ° C., the temperature can be heated uniformly. The speed is, for example, a speed at which the drying surface temperature of the wear refractory is 40 ° C. or less per hour, that is, 40 (° C./hour) or less (further 35 (° C./hour) or less). On the other hand, the lower limit value of the heating rate is not particularly limited, but is 5 (° C./hour), and further 10 (° C./hour), considering that drying is performed in a shorter time.
As described above, by heating and drying the formed lining 15, explosion during the drying of the wear refractory 12 composed of the cast amorphous refractory can be suppressed and further prevented.

Next, examples carried out for confirming the effects of the present invention will be described.
First, a refractory was lined as the lining of a cylindrical container.
This lining is carried out by arranging the wear refractory, the first permanent refractory, the heat insulating material, and the second permanent refractory in this order from the inner side of the furnace to the outer side of the iron shell of the cylindrical container. It was. Here, an alumina-magnesia cast amorphous refractory (water content: 4 mass% to 9 mass%) is used as the wear refractory, and a high alumina standard refractory is used as the first permanent refractory. As the second permanent refractory, a fixed type refractory having a waxy quality was used.

When performing the above lining, the lining application location, the thickness of the wear refractory and the first permanent refractory, the position of the heat insulating material, and the heat passage rate thereof were variously changed.
Then, the lining is dried from room temperature using a burner so that the operating surface temperature of the wear refractory is constant at 40 (° C / hour), and the back temperature of the wear refractory containing water reaches 110 ° C. At the timing when the dehydration was completed (no water vapor was generated), the temperature gradient (° C./mm) in the wear refractory (thickness direction of the wear refractory) and the occurrence of explosion trouble were investigated. In addition, the temperature rise with the operating surface temperature of the above-described wear refractory set to 40 (° C./hour) is to uniformly heat the heated dry surface from 100 ° C. to 200 ° C. This is the fastest heating rate possible.
Table 1 shows the test conditions, the temperature gradient of the obtained wear refractory, and the results of the occurrence of explosion trouble.

In the column of the construction position of the heat insulating material shown in Table 1, “A” means that the heat insulating material is disposed between the first permanent refractory and the second permanent refractory, and “B” The case where the heat insulating material is arrange | positioned between an iron skin and a 2nd permanent refractory means each.
The temperature gradient of the wear refractory is the value obtained by subtracting the back surface temperature from the operating surface temperature of the wear refractory when the back temperature of the wear refractory reaches 110 ° C. and the dehydration is completed (no steam is generated). The value divided by the thickness of the wear refractory, that is, the value obtained by the following equation.
{(Wear refractory operating surface temperature)-(Wear refractory back surface temperature)} / (Wear refractory thickness)
The operating surface temperature and the back surface temperature of the ware refractory were obtained by installing thermocouples on the operating surface of the ware refractory and the furnace inner surface of the first permanent refractory when the lining was formed. These thermocouples are installed at almost the same height.
In the column of the presence / absence of explosion trouble, “O” means that no explosion trouble has occurred, and “X” means that explosion trouble has occurred.

In Table 1, in Examples 1 to 5, the thicknesses of the wear refractory and the first permanent refractory are within appropriate ranges (wear refractory: 190 mm or less, first permanent refractory: 30 mm or more and 65 mm or less). It is the result of having arrange | positioned the heat insulating material which set and set the heat passage rate in the appropriate range (30W / (m < ² > * K) or less) between the 1st permanent refractory and the 2nd permanent refractory.
On the other hand, Comparative Examples 1-5 are the results of missing some of the conditions described above. That is, Comparative Example 1 did not use the heat insulating material, Comparative Example 2 had the heat insulating material disposed between the iron skin and the second permanent refractory, and Comparative Example 3 had the heat passing through the heat insulating material. As a result of setting the rate out of the proper range, Comparative Example 4 is a result of setting the thickness of the wear refractory outside the proper range, and Comparative Example 5 is a result of setting the thickness of the first permanent refractory outside the proper range. .

First, the result of having changed the construction site | part of a heat insulating material is demonstrated using Example 1, 5. FIG.
Since Example 1 is a result of constructing the lining on the wall portion, it was possible to prevent the heat insulation performance of the heat insulating material from being deteriorated by the dead weight of the refractory applied to the inside of the furnace from the heat insulating material in the lining. On the other hand, since Example 5 is a result of having applied lining to the bottom part, the heat insulation performance of the heat insulating material deteriorated by the dead weight of the refractory to be installed inside the furnace from the heat insulating material in the lining.
For this reason, it is considered that the temperature gradient in the wear refractory could not be kept small in Example 5 compared to Example 1, but the desired temperature gradient of the wear refractory was obtained (0. Therefore, the effect of preventing explosion was obtained. However, it was confirmed that the effect of keeping the temperature gradient small was greater when the heat insulating material was applied to the wall as in Example 1.

Next, the result of changing the construction position of the heat insulating material will be described using Example 1 and Comparative Examples 1 and 2.
From the results of Example 1 and Comparative Examples 1 and 2, it is possible to reduce the temperature gradient in the wear refractory by installing the heat insulating material near the heat source, that is, close to the wear refractory. It was confirmed that it was possible to prevent explosion problems.
In addition, about the case where a heat insulating material is arrange | positioned between a wear refractory and a 1st permanent refractory, the fall of the heat insulation performance of a heat insulating material is easy by contact with the water | moisture content contained in a heat insulating material and a wear refractory. It is assumed that it is not implemented.

Then, the result of having changed the heat passage rate of the heat insulating material is demonstrated using Examples 1, 2 and Comparative Example 3. FIG.
From the results of Examples 1 and 2 and Comparative Example 3, the temperature gradient in the ware refractory is reduced as the heat transmission rate of the heat insulating material is smaller (the thermal conductivity is lower or the heat insulating material is thicker). It was confirmed that it was possible to prevent the explosion trouble of the wear refractory.
It can be easily imagined that the greater the heat transfer rate of the heat insulating material, the greater the temperature gradient in the wear refractory and the greater the risk of explosion problems.

Next, the result of changing the thickness of the wear refractory will be described using Examples 1 and 4 and Comparative Example 4.
From the results of Examples 1 and 4 and Comparative Example 4, the thickness of the wear refractory is considered to be a large factor that determines the temperature gradient in the wear refractory. In particular, from Example 1 and Comparative Example 4, even if the thickness of the wear refractory is 190 mm and 10 mm, which is a difference of 10 mm, a difference in temperature gradient effective for preventing explosion of the wear refractory composed of the amorphous refractory can be obtained. I understood that.
In addition, from the results of Examples 1 and 4 and Comparative Example 4, as the thickness of the wear refractory increases, the temperature gradient in the wear refractory increases and the risk of explosion trouble occurring in the wear refractory increases. Can be easily imagined.

Finally, the results of changing the thickness of the first permanent refractory will be described using Examples 1 and 3 and Comparative Example 5.
From the results of Examples 1 and 3 and Comparative Example 5, it was confirmed that the thinner the thickness of the first permanent refractory, the smaller the temperature gradient in the wear refractory can be prevented and the explosion trouble of the wear refractory can be prevented. did it.
If the thickness of the first permanent refractory is too thin, the function (prevention of leakage steel) as a permanent refractory may be remarkably impaired.

Here, FIG. 2 shows the relationship between the temperature gradient in the wear refractory (wear refractory refractory) shown above and the occurrence of explosion trouble.
As shown in FIG. 2, the explosion trouble of the wear refractory is clearly recognized as to whether or not the explosion occurred at the temperature gradient 0.5 (° C./mm) in the wear refractory. It was confirmed that the temperature gradient in the wear refractory contributed greatly.
From the above results, as shown in Examples 1 to 5, the thickness of the wear refractory and the first permanent refractory, and the arrangement position of the heat insulating material and the heat passage rate thereof are made appropriate, thereby making the desired wear refractory. A temperature gradient of the object can be obtained, and explosion during the drying of the wear refractory can be suppressed and further prevented.
Therefore, it was confirmed that by using the method for drying a lining of the present invention, explosion during wear of a ware refractory composed of a cast amorphous refractory can be prevented.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included. For example, a case where the drying method of the lining of the present invention is configured by combining some or all of the above-described embodiments and modifications is also included in the scope of the right of the present invention.
Further, in the above-described embodiment, the case where the lining drying method of the present invention is applied to a molten metal container is described. However, the present invention is not limited to this as long as the lining is to be performed. Good.

10: molten metal container, 11: iron skin, 12: wear refractory, 13: first permanent refractory, 14: second permanent refractory, 15: lining, 16: heat insulating material

Claims (2)

In the drying method of the lining formed in the order of the wear refractory material, the first permanent refractory material, and the second permanent refractory material from the side in contact with the molten metal to the iron skin side, arranged on the surface of the iron skin,
The wear refractory is composed of an indeterminate cast refractory having a thickness of 190 mm or less obtained by kneading with water, the first permanent refractory is composed of a regular refractory having a thickness of 30 mm to 65 mm, and A heat insulating material having a heat conductivity divided by a thickness of 30 W / (m ² · K) or less is disposed between the first permanent refractory and the second permanent refractory, and the lining The lining is dried by heating from the ware refractory side. 2. The lining drying method according to claim 1, wherein the lining drying method is applied to a furnace wall of a molten metal container.

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