JPH10281660A - Monolithic-refractory applying method and core flask - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a hardening time and a work time by inserting and mounting a core flask having a plurality of vapor leak holes in a molten metal vessel with a lining made of permanent bricks and casting monolithic refractories in a space defined between the core flask and the permanent bricks and heating the inside of the core flask. SOLUTION: At a main trough of a blast furnace, in applying refractories by casting, a core flask 1 is inserted and installed in the main trough in which permanent bricks are mounted as a lining. This flask 1 comprises a flask body 2 made of a plurality of parallely connected steel-made rectangular sleeve bodies 3 which define a refractories application face as a body and is formed substantially in a U-shape following the cross sectional shape of the main trough. Between neighboring rectangular sleeve bodies 3, 3, a porous plate 5 having a plurality of vapor leak holes 4 in a dotted manner is provided and the inner surface sides of a plurality of rectangular sleeve bodies 3 are connected by means of these porous plates 5. Heating means 6 and heat insulating means 7 are accommodated in each rectangular sleeve body 3 so as to heat the inside of the core flask 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of applying an amorphous refractory to a molten metal container such as a gutter or a ladle of a blast furnace to perform lining or repair of the refractory, and to use the method. It relates to a new core formwork.

[0002]

2. Description of the Related Art Conventionally, lining of a refractory with a refractory in a molten metal vessel such as a gutter or a ladle of a blast furnace is performed by inserting a core form into a molten metal vessel having a perm brick inside. As an irregular refractory, castable kneaded with, for example, an added water of about 5 to 7% is poured in and cast, and a uniform pouring work is performed by using the thixotropic property of the castable with a core vibration or a rod-shaped vibrator, and cement bond, etc. After curing until formed and strong, remove the core form,
A general construction method is to heat and dry with a gas burner or the like from the working surface side of the construction body.

[0003] Japanese Patent Application Laid-Open No. 57-187161 (hereinafter referred to as "Citation 1") discloses a technique relating to such a method of applying an irregular-shaped refractory to a "method for setting a mold for casting." Such an invention has been proposed.
The gist of the present invention is that, when a mold for casting is installed, a water-impermeable material is interposed between the molten metal container and the floor, and the work is performed at a position corresponding to the outer peripheral portion of the mold. According to the present invention, there is provided an absorbent material that absorbs moisture contained in the pouring material that penetrates downward and backward.
It is possible to accelerate the curing by absorbing excess moisture of the amorphous refractory.

Japanese Patent Application Laid-Open No. Sho 59-18172 (hereinafter referred to as "Cited Example 2") proposes an invention relating to "a method for accelerating drying and curing of amorphous refractories".
The gist of the present invention lies in "providing an exothermic reaction between metal aluminum and water in the refractory by applying ultrasonic vibration to the constructed refractory," according to the present invention.
That is, the refractory construction can be uniformly heated to accelerate the curing.

[0005] Furthermore, Japanese Patent Application Laid-Open No. 7-4862 (hereinafter referred to as "Cited Example 3") proposes an invention relating to "a method and an apparatus for pouring an amorphous refractory". The gist of the invention of this construction method is that "a plurality of vibrators are arranged vertically and horizontally on a core frame, a vibration having a vibration force having a set value determined in advance by experiment is given, and the vibrator is activated. The set value is fed back and the vibrator is controlled so as to vibrate within the range of the set value of the set force. " Multiple pieces are arranged vertically and horizontally on the core frame,
It has a vibrator for applying vibration to the cast refractory, a vibration measuring element for measuring a vibration force by the vibrator, and a vibration force control unit for appropriately controlling the vibration force. According to these inventions, the variation in the life of the refractory can be greatly reduced, and the average life can be improved.

[0006]

According to the invention relating to the "method for setting a casting formwork" of the cited reference 1, the excess moisture contained in the irregular refractory is absorbed to accelerate the curing. However, sufficient shortening of the curing time was not realized. Further, in the invention according to the “method of accelerating the drying and curing of the amorphous refractory” of the cited example 2,
Acceleration of hardening of the refractory construction body due to the exothermic reaction between metal aluminum and water is greatly reduced compared to natural curing, but it has not been sufficient yet. Furthermore, in the invention relating to the “method and apparatus for pouring an irregular-shaped refractory” of the cited reference 3, although the structure of the core frame is devised, there is no viewpoint regarding the high productivity of the refractory construction body. However, it was not possible to meet the demand for obtaining a dried construction body quickly.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to shorten the hardening time and work time of a refractory and to obtain a uniform fired body. It is an object of the present invention to provide a method of constructing an object and a new core form used for the method.

[0008]

According to the object of the present invention, a core mold having a plurality of water vapor vent holes is provided in a molten metal container provided with a perm brick. Insert and install the refractory between the core formwork and the perm brick, pour in the work, and heat the inside of the core formwork. The steam is discharged to dry the amorphous refractory while the core formwork is installed.

Also, a core mold having heating means and having a plurality of water vapor vent holes is inserted and installed in a molten metal container in which a permanent brick is housed, and an imperfection is provided between the core mold and the permanent brick. Pour the fixed refractories into place and heat the irregular refractories with heating means to discharge steam from the refractory construction surface through the steam vent holes, leaving the core formwork in place. The refractory is dried.

[0010] Preferably, a mold formed of high-strength paper is used as the core mold.

Preferably, the paper core form is
It is reinforced with metal bars.

[0012] More preferably, as the heating means,
An electric heater is used. Or,
A heating medium is used as the heating means.

[0013] On the other hand, according to the core formwork of the present invention, when the refractory is cast and poured, the formwork is inserted and installed in a molten metal container equipped with a perm brick,
A plurality of water vapor vent holes are provided in the form of spots in a form body for forming and forming a construction surface of an amorphous refractory.

[0014] Preferably, the form body is formed of a steel plate. Alternatively, the mold body is formed of high-strength paper. This high-strength paper is formed of corrugated paper coated with a thermosetting synthetic resin.

Preferably, the paper frame is provided with a metal bar.

[0016] More preferably, the mold has a heating means.

[0017] Preferably, the heating means is formed by an electric heater. Alternatively, the heating means is formed by a cylindrical body through which a heat medium passes.

A conventional method for applying an amorphous refractory is to cast an amorphous refractory between a perm brick and a core form, cure the molded article for an appropriate time, and then remove the frame to form a refractory article. Although it was heated and dried by a gas burner or the like from the working surface side, according to the present invention, an irregular-shaped refractory is poured using a core form having a plurality of steam vent holes, and the refractory is constructed. By heating the surface, the steam is discharged from the refractory construction surface through the water vapor vent hole of the core form, and after the refractory has been dried while the core form is installed, the core form Since the frame is removed from the frame, the hardening time of the refractory and the working time can be shortened, and a uniform construction can be obtained.

[0019]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Although the method of applying the irregular shaped refractory according to the present invention can be applied to various molten metal containers, the method of applying the first embodiment is applied to a gutter of a blast furnace.

That is, the construction method of the first embodiment is as follows.
This is carried out using a core form 1 as shown in FIG. The core formwork 1 is a formwork inserted and installed in a large gutter containing a perm brick when pouring in an irregular-shaped refractory, and its main body is a mold for forming and defining a construction surface of the irregular-shaped refractory. It is formed as a frame 2. The form body 2 is formed by connecting a plurality of rectangular steel cylinders 3 in parallel, and has a concave cross section as a whole along the cross section of the large gutter.

FIG. 1 shows a state in which rectangular cylinders 3 and 3 are adjacent to each other.
(B) As shown in (c), a porous plate 5 in which a plurality of water vapor vent holes 4 are formed in a scattered manner is provided, and the inner surface side of the plurality of rectangular cylindrical bodies 3 is formed by the porous plate 5. Are linked. The water vapor vent hole 4 formed in the porous plate 5 is set, for example, so as to occupy about 50% of the entire inner surface area of the mold body 2.

In each of the rectangular cylinders 3, a heating means 6 and a heat insulating material 7 are housed. In the present embodiment, for example, an electric heater is employed as the heating means 6, and the heater 6 is disposed in the rectangular cylindrical body 3 on the outer surface side in contact with the irregular-shaped refractory. The heat insulating material 7 is disposed inside the rectangular cylindrical body 3 on the inner side of the heater 6.

The construction method of the first embodiment is carried out as follows using the core form 1 formed as described above. That is, first, the core form 1 is inserted and installed in the gutter. At this time, the core form 1 is arranged at a predetermined interval from the perm bricks contained in the gutter. Next, core form 1
Pour in irregular shaped refractories between
The irregular-shaped refractory is heated by a heater 6 provided in the rectangular cylinder 3.

In the heating by the heater 6, the temperature of the heater 6 is raised and heated while appropriately controlling the temperature of the heater 6 during curing and drying of the amorphous refractory. When the work surface of the irregular-shaped refractory is heated, steam is discharged from the work surface through the water vapor vent hole 4 of the porous plate 5. After the drying of the amorphous refractory is completed with the core form 1 installed in this way, the core form 1 is removed from the gutter, so that the refractory hardening time and working time can be reduced. And a uniform construction body can be obtained.

FIGS. 2A and 2B show a core form used in the construction method according to the second embodiment. FIG. 2A is a schematic perspective view, and FIG. The construction method of the second embodiment is similar to the construction method of the first embodiment, and is applied to a gutter of a blast furnace, and a core form 11 as shown in FIGS. Implemented using

As shown in the figure, the main body of the core form 11 is formed by a form body 12 in which a plurality of rectangular cylinders 13 are connected in parallel by a porous plate 15 as in the first embodiment. So that it is formed and follows the cross section of the gutter,
The cross-sectional shape has a concave shape as a whole. As in the first embodiment, a water vapor vent hole 14 is formed in the porous plate 15 so that the water vapor vent hole 14 occupies, for example, about 50% of the entire inner surface area of the mold body 12. Is set.

In the second embodiment, the heating means 16 is configured such that a heat medium passes through each rectangular cylindrical body 13. As the heat medium 16, for example, high-temperature steam or heated air is used.

The construction method of the second embodiment is carried out as follows using the core form 11 thus formed. That is, first, the core form 11 is inserted and installed in the large gutter at a predetermined interval from the perm brick, and an irregular-shaped refractory is poured between the core form 11 and the perm brick.
Then, the heat medium 16 is passed through the rectangular cylindrical body 13, and the irregular-shaped refractory is heated via the steel rectangular cylindrical body 13.

The heating by the heating medium 16 is carried out while heating and drying the amorphous refractory while appropriately controlling the temperature of the heating medium 16. When the construction surface of the irregular-shaped refractory is heated, steam is discharged from the construction surface through the steam vent hole 14 of the porous plate 15. After the drying of the amorphous refractory is completed with the core form 11 installed in this way, the core form 1 is removed from the large gutter, so that the refractory hardening time is the same as in the first embodiment. In addition, the working time can be reduced, and a uniform construction body can be obtained.

FIGS. 3A and 3B show a core form used in the construction method of the third embodiment. FIG. 3A is a schematic perspective view and FIG. 3B is a sectional view. The construction method of the third embodiment is different from the construction methods of the first and second embodiments, and is applied to a ladle that is a molten metal container, as shown in FIGS. 3 (a) and 3 (b). This is performed using the core formwork 21.

As shown in the figure, the core frame 21 is formed of a steel plate having a bottomed cylindrical shape, and the diameter thereof is sequentially increased from the bottom toward the opening. That is, the core formwork 21 is a formwork that is inserted and installed in the ladle 22 containing the perm bricks when pouring and carrying the irregular-shaped refractory, and forms the construction surface of the irregular-shaped refractory. Therefore, it is formed along the sectional shape of the ladle 22.

A plurality of steam vent holes 24 are formed in the core mold 21 in a scattered manner.
Is set to occupy, for example, about 50% of the entire inner surface area of the core mold 21.

The construction method of the third embodiment is carried out as follows using the core form 21 formed as described above. That is, first, the core form 21 is placed in the ladle 22.
At this time, the core form 21 is arranged at a predetermined interval from the perm bricks provided in the ladle 22. Next, an irregular-shaped refractory is poured between the core formwork 21 and the permanent brick, and the core formwork 21 is completed after the pouring work is completed.
Is heated by the gas burner 26 to heat the irregular refractory via the steel core form 21.

In the heating by the gas burner 26, the temperature is raised and heated while appropriately controlling the flame of the gas burner 26 during curing and drying of the amorphous refractory. When the construction surface of the irregular-shaped refractory is heated, steam is discharged from the construction surface through the steam vent hole 24 of the core formwork 21. After the drying of the amorphous refractory is completed with the core form 21 installed in this way, the core form 21 is removed from the ladle 22, so that the hardening time and work time of the refractory can be reduced. It is possible to obtain a uniform construction body.

FIGS. 4A and 4B show a core form used in the construction method of the fourth embodiment. FIG. 4A is a schematic perspective view and FIG. 4B is a sectional view. The construction method of the fourth embodiment is similar to the construction method of the third embodiment and is applied to a ladle, and uses a core form 31 as shown in FIGS. It will be implemented.

As shown in the figure, the core form 31 is formed of a steel plate having a bottomed cylindrical shape whose diameter is sequentially increased from the bottom to the opening, as in the third embodiment. Ladle 3 in order to define the construction surface of the refractory
2 is formed along the cross-sectional shape. This core form 3
As in the third embodiment, a plurality of water vapor vent holes 34 are formed in a scattered manner in the first embodiment.
For example, it is set so as to occupy about 50% of the entire inner surface area of the core mold 31.

On the inner surface of the core mold 31, a heating means 36 for heating the irregular-shaped refractory is provided. In the fourth embodiment, a meandering cylinder 36 through which a heat medium passes is configured as the heating means 36. This meandering cylinder 3
6 is formed of, for example, a steel pipe, and, for example, high-temperature steam or heated air is used as a heat medium passing therethrough.
In FIG. 4B, the meandering cylinder 36 is omitted for convenience.

The construction method of the fourth embodiment is carried out as follows using the core form 31 thus formed. That is, first, the core form 31 is inserted into the ladle 32 at a predetermined interval from the perm brick, and is installed.
Pour in irregular shaped refractories between 1 and perm brick. Then, a heat medium is passed through the meandering cylinder 36 to heat the irregular-shaped refractory via the steel meandering cylinder 36 and the core form 31.

The heating by the heating medium is carried out by appropriately controlling the temperature of the heating medium during curing and drying of the amorphous refractory.
Perform heating. When the construction surface of the irregular-shaped refractory is heated, steam is discharged from the construction surface via the steam vent hole 34 of the core form 31. After the drying of the amorphous refractory is completed with the core form 31 installed in this way, the core form 3
Since 1 is removed from the ladle 32, the hardening time of the refractory and the working time can be reduced as in the third embodiment, and a uniform construction can be obtained.

FIGS. 5A and 5B show a core form used in the construction method of the fifth embodiment. FIG. 5A is a schematic perspective view, FIG. 5B is a partial schematic view of a heating means, c) is a sectional view thereof. The construction method of the fifth embodiment is similar to the construction methods of the third and fourth embodiments, and is applied to a ladle, as shown in FIGS. 5 (a), 5 (b) and 5 (c). This is performed using the child formwork 41.

As shown in the figure, the core mold 41 is made of a steel plate having a bottomed cylindrical shape whose diameter is gradually increased from the bottom toward the opening, similarly to the third and fourth embodiments. The ladle 42 is formed along the sectional shape of the ladle 42 so as to partition and form the construction surface of the irregular-shaped refractory. As in the third and fourth embodiments, a plurality of water vapor vent holes 44 are formed in the core form 41 in a scattered manner, and the water vapor vent holes 44 are formed, for example, in the core form 41. Is set so as to occupy about 50% of the entire internal surface area.

On the inner surface of the core form 41, a heating means 46 for heating the amorphous refractory is provided. In the fifth embodiment, for example, an electric heater 47 is employed as the heating means 46, and the heater 47 is housed in a meandering pipe 48 made of steel. In FIG. 5C, the heating means 46 is omitted for convenience.

The construction method of the fifth embodiment is carried out as follows using the core form 41 thus formed. That is, first, the core form 41 is inserted into the ladle 42 at a predetermined interval from the perm brick, and the core form 41 is inserted.
Pour in irregular shaped refractories between 1 and perm brick. Then, the heater 47 is energized and heated to heat the irregular refractory via the meandering pipe 48 made of steel and the core frame 41.

In the heating by the heater 47, the temperature is raised and heated while appropriately controlling the temperature of the heater 47 during curing and drying of the amorphous refractory. When the construction surface of the irregular-shaped refractory is heated, steam is discharged from the construction surface through the steam vent hole 44 of the core form 41. After the drying of the amorphous refractory is completed with the core form 41 installed in this way, the core form 41 is removed from the ladle 42.
Similarly to the fourth embodiment, the hardening time and the working time of the refractory can be reduced, and a uniform construction can be obtained.

FIGS. 6A and 6B show a core form used in the construction method of the sixth embodiment, wherein FIG. 6A is a schematic perspective view thereof, and FIG. , (C)
It is sectional drawing. The construction method of the sixth embodiment is similar to the construction method of the third embodiment.
Similarly to the construction method of the fifth to fifth embodiments, the present invention is applied to a ladle, and is carried out using a core form 51 as shown in FIGS. 6 (a), 6 (b) and 6 (c).

As shown in the drawing, the core frame 51 has a bottomed cylindrical shape whose diameter is gradually increased from the bottom toward the opening, similarly to the third to fifth embodiments. In order to define the construction surface of the refractory, the ladle 52 is formed along the sectional shape of the ladle 52. The sixth embodiment is characterized in that the constituent material is paper. Specifically, the core mold 51 is formed by applying and impregnating a thermosetting synthetic resin such as a phenol resin, an epoxy resin, and a urethane resin onto paper such as corrugated cardboard to increase the strength. A non-combustible paint (J) is provided on the inner surface (the surface that comes into contact with the flame of the gas burner) of the core mold 51 formed of high-strength paper.
IS A1321: flame-retardant first-class compliant product) is applied to suppress burning of the paper.

As in the third to fifth embodiments, a plurality of water vapor vent holes 54 are formed in the core mold frame 51 in a scattered manner. Frame 5
1 is set to occupy about 50% of the entire internal surface area.

In the present embodiment, the inside of the core mold 51 is heated by using a heating means such as a gas burner 56, but the invention is not limited to this. A meandering cylinder through which a heater or a heat medium passes may be provided. In addition, when the ladle 52 is large or the strength of the paper forming the core form 51 is small, as shown in FIG. A bar 57 made of steel is provided for reinforcement. This steel bar 57
Are formed in a grid pattern vertically and horizontally so as to cover the outer peripheral surface of the core mold 51. In FIG. 6C, the steel bar 57 is omitted for convenience.

The construction method of the sixth embodiment is carried out as follows using the core form 51 thus formed. That is, first, the core form 51 is inserted into the ladle 52 at a predetermined interval from the perm brick, and is installed.
Pour in irregular shaped refractories between 1 and perm brick. Then, the inside of the core mold 51 is heated by the gas burner 56 to heat the irregular-shaped refractory. Core form 5 made of paper
Even if 1 is heated by the gas burner 56,
Since the nonflammable paint is applied, the burning of the paper is suppressed and the paper is not burned.

In the heating by the gas burner 56, the temperature is raised and heated while appropriately controlling the flame of the gas burner 56 during curing and drying of the amorphous refractory. When the work surface of the irregular-shaped refractory is heated, steam is discharged from the work surface through the steam vent hole 54 of the core form 51. After the drying of the amorphous refractory is completed with the core form 51 installed in this way, the core form 51 is removed from the ladle 52.
Similarly to the fifth to fifth embodiments, it is possible to shorten the hardening time of the refractory and the working time, and obtain a uniform construction body.

Thus, according to the present invention, the curing time of the amorphous refractory can be shortened by completing the drying of the amorphous refractory with the core form being set in the molten metal container. That is, conventionally, the curing time is usually 12 to 24 hours.
It took about an hour, and in actual work, almost one day was required for curing and de-framing. However, by drying the amorphous refractory by the heating means while the core form is installed, compared with the conventional method of drying with a gas burner after demolding, the core form is used for the refractory. Since drying is performed by indirect heating, uniform drying can be performed without a local rise in temperature. Becomes possible.

The heating means is preferably capable of adjusting the temperature, and it is preferable to provide as many vapor vent holes as possible to make the holes uniform. However, the hole diameter of the steam vent hole should be set to a size such that the irregular refractory does not come out of the steam vent hole during the casting of the irregular refractory. Further, since the hole diameter of the steam vent hole depends on the particle size distribution of the amorphous refractory used, an appropriate hole diameter is appropriately selected and set.

[0053]

Next, the operation and effect of the present invention were confirmed by applying the present invention to an actual machine. In the first embodiment, the present invention is applied to a gutter of a blast furnace, and in the second embodiment, the present invention is applied to a ladle. Example 1 In Example 1, the present invention was applied to a gutter installed in a blast furnace of 4000 m ³ . The lining of this gutter is
It is formed of a perm brick and a pouring material of wear, and Al ₂ O ₃ —SiC—C is usually used as the pouring material.

Conventionally, the lining of a gutter is performed by first inserting a core form into the gutter, pouring the garment, removing the rim after drying for 12 to 24 hours, and drying the garment in the process of drying. Is formed. The thickness of the wear construction body is about 400 mm, and drying is generally performed by a gas burner. However, since the thickness of the wear construction body is large, drying is performed for about 24 hours. If the heat capacity of the gas burner is increased to shorten the drying time, there is a problem that explosion occurs.

Therefore, in order to shorten the time required for construction and drying of the wear casting material, a core form 11 having a steam vent hole 14 as shown in FIG. 2 is used. Was dried by a gas burner. The hole diameter of the steam vent hole 14 formed in the core form 11 is 5
The steam vent holes 14 were arranged evenly so that about 60% of the entire inner surface area of the mold body 12 was occupied by the steam vent holes 14.

First, the temperature of the refractory is raised at a rate of 1 degree Celsius per minute until the central temperature of the refractory reaches 60 degrees Celsius, maintained for about 2 hours, and then increased at a rate of 5 degrees Celsius per minute to 300 degrees Celsius. And dried. After the drying of the wear construction body was completed, the core form 11 was removed from the frame, a gutter cover was installed, and preheating was performed. Then, it took about 48 hours to complete the drying after the pouring of the wear, but the drying of the wear construction was completed in only about 8 hours. Moreover, the quality of the wear construction body after drying was the same as the conventional one.

Next, the core form 1 was used without using a gas burner.
Hot air was passed through the first rectangular cylindrical body 13 to dry the wear construction body in the same manner. The steam vent hole 14 is provided in the form 1
2 was set to occupy 50% of the total internal surface area.
After pouring in the wear, hot air at 250 degrees Celsius was flown into the rectangular cylindrical body 13 to perform drying while controlling the temperature. Then, the drying of the wear construction was completed in only about 10 hours, and the quality was the same as that obtained by heating using the gas burner.

Further, when the core mold 1 equipped with the heater 6 in the rectangular cylindrical body 3 as shown in FIG. 1 was used, the same drying time and quality were obtained. The capacity of the heater 6 used was 30 kW, and the temperature raising rate was the same as that of the gas burner. When a heat medium and a heater were used, heat was largely removed from the inner surface of the core form, so that a ceramic fiber was arranged on the inner surface of the core form to form a heat insulating structure.

Embodiment 2 In Embodiment 2, the present invention is applied to a ladle. The refractories for ladle, usually Al ₂ O ₃ -Spinel system, or Al ₂ O ₃ -MgO based monolithic refractory have been used. Ladle lining is usually laid first and poured, and after curing, insert a core mold for the side wall and install it.
The castable of 6% is poured and constructed, the core form is removed after curing, and heated and dried by a gas burner or the like.

Therefore, the present invention was applied to a core form when lining the side wall. In the same manner as in Example 1, the construction was performed without curing time using a gas burner, hot air, and an electric heater as the heating means for the core form. Although the drying time of the castables was not significantly reduced, the curing time of 12 to 24 hours could be reduced in each case.

Next, an embodiment using the paper core form shown in FIG. 6 will be described. Corrugated paper with a large number of vapor vent holes 54 and impregnated with epoxy resin (5 mm thick)
Is used as the core form 51 of the ladle 52. The diameter of the steam vent hole 54 was 5 mm in diameter, and the steam vent hole 54 was set so as to occupy 60% of the entire inner surface area of the core mold 51. When the inner volume is large, such as a ladle 52 of 300 tons, the steel core frame 51 is reinforced by the steel bar 57 to prevent the refractory from falling down. Since a gas burner was used as a heating source, a non-combustible paint (JIS A1321: fire-resistant first-class compliant product, for example, FUNENTEX made by Kanae Paint) was applied to the inner surface of the core mold 51, which is a surface that comes into contact with the flame,
Paper burning was suppressed until the strength of the refractory construction was increased. If only the lining is dried, the temperature of the refractory will be 20 degrees Celsius.
Since it is 0 degrees to 300 degrees, the paper core mold 51 could be used repeatedly.

When drying and preheating were performed at the same time, the paper core was burned and disposable without deframing. as a result,
As in the case of the first embodiment, the curing time can be reduced as compared with the conventional case, and the time can be reduced by 12 to 24 hours. When the amount of refractory to be constructed by other linings is small, the steel bar 57 can be omitted, and the refractory can be prevented from falling down only by the paper core form 51. It could be used as the child formwork 51.

[0063]

As described above, according to the present invention, a core mold having a water vapor vent hole is inserted and installed in a molten metal container, and heat drying is performed with the core mold installed. Thereby, it is possible to shorten the hardening time and the working time of the refractory, and it is possible to obtain a uniform construction body and to exert an excellent effect that the reliability thereof can be improved.

[Brief description of the drawings]

1A and 1B show a core form used in a construction method according to a first embodiment, wherein FIG. 1A is a schematic perspective view, FIG. 1B is a sectional view of a main part thereof, and FIG. It is.

FIGS. 2A and 2B show a core form used in the construction method of the second embodiment, wherein FIG. 2A is a schematic perspective view and FIG.

3A and 3B show a core form used in a construction method according to a third embodiment, wherein FIG. 3A is a schematic perspective view and FIG. 3B is a sectional view thereof.

4A and 4B show a core form used in the construction method of the fourth embodiment, wherein FIG. 4A is a schematic perspective view and FIG. 4B is a sectional view thereof.

5A and 5B show a core form used in a construction method according to a fifth embodiment, wherein FIG. 5A is a schematic perspective view, FIG. 5B is a partial schematic view of a heating means, and FIG. It is.

6A and 6B show a core form used in the construction method of the sixth embodiment, wherein FIG. 6A is a schematic perspective view thereof, FIG. 6B is a schematic perspective view of a state reinforced by a bar, and FIG. FIG.

[Explanation of symbols]

1,11,21,31,41,51 Core form 2,2 Form body 4,14,24,34,44,54 Steam vent hole 6,16,26,36,46,56 Heating means 57

Claims (14)

[Claims] 1. A core mold having a plurality of water vapor vent holes is inserted and installed in a molten metal container containing a permanent brick, and an irregular refractory is poured between the core mold and the permanent brick. By installing and heating the inside of the core form, the steam is discharged from the construction surface of the refractory through the water vapor vent hole, so that the amorphous refractory can be dried while the core form is installed. A method for constructing an irregular-shaped refractory characterized by the following. 2. A core mold having a heating means and having a plurality of water vapor vent holes is inserted and installed in a molten metal container having a perm brick inside. Pour the fixed refractories into place and heat the irregular refractories with heating means to discharge steam from the refractory construction surface through the steam vent holes, leaving the core formwork in place. A method for constructing an irregular-shaped refractory, wherein the refractory is dried. 3. The method according to claim 1, wherein a mold formed of high-strength paper is used as the core mold. 4. The method according to claim 3, wherein the paper core form is reinforced by a metal crosspiece. 5. The method according to claim 2, wherein an electric heater is used as the heating means. 6. The method according to claim 2, wherein a heating medium is used as the heating means. 7. A mold that is inserted and installed in a molten metal container containing a perm brick when pouring an irregular-shaped refractory into a mold, and forms a work surface of the irregular-shaped refractory, A core mold having a plurality of water vapor vent holes in a scattered manner. 8. The core mold according to claim 7, wherein the mold body is formed of a steel plate. 9. The core mold according to claim 7, wherein the mold body is formed of high-strength paper. 10. The core mold according to claim 9, wherein the high-strength paper is formed of corrugated cardboard coated with a thermosetting synthetic resin. 11. The core mold according to claim 9, wherein the paper mold body is provided with a metal crosspiece. 12. The core mold according to claim 7, wherein the mold body includes a heating unit. 13. The core mold according to claim 12, wherein said heating means is formed by an electric heater. 14. The core type member according to claim 12, wherein said heating means is formed by a cylindrical body through which a heat medium passes.