Fire-resistant material and method for manufacturing the same

Abstract

The present invention provides a fire-resistant material that does not crack or peel off the substrate even when rapidly cooled after being heated to a high temperature. [Solution] The solution consists of a mixture of a liquid heat-resistant binder containing at least sodium silicate, potassium silicate, Snowtex, wood clay, and Beston, and a refractory powder containing at least Beston, milk casein, and perlite. Because the expansion and contraction rates are small, cracks will not occur or peel off from the substrate even when heated to high temperatures and then rapidly cooled.

Description

Technical Field

[0001] The present invention relates to a refractory material and a method for manufacturing the same.

Background Art

[0002] Conventionally, when incinerating industrial waste or the like in an incinerator, combustion shells, ash, etc. remain and accumulate as residues in the furnace. Therefore, the residues are scraped out of the furnace every time a certain amount is reached and transported by a transport vehicle to a disposal site for the residues, an ash recycling factory, etc. for final treatment.

[0003] In that case, even when the furnace is stopped, the residues continue to burn, and the residues cannot be scraped out of the furnace, so the utilization efficiency of the furnace is extremely low. Therefore, after the furnace is stopped, water is sprayed onto the residues to extinguish the fire and improve the utilization efficiency of the furnace.

[0004] However, since the furnace wall is formed by refractory bricks or by applying refractory castable (unshaped refractory) to a base such as a heat insulating material, when the water sprayed toward the residues hits the furnace wall and the furnace wall is rapidly cooled, cracks occur in the refractory bricks or the refractory castable peels off from the base, damaging the furnace wall.

[0005] Also, in a heat treatment furnace or the like, when the heat treatment or the like is completed and the door (hatch) is opened, if cold air outside the furnace enters the furnace and the furnace wall is rapidly cooled, cracks occur in the refractory bricks or the refractory castable peels off from the base, damaging the furnace wall.

[0006] Therefore, a furnace has been provided in which foam is released from a foaming device into the furnace to extinguish the residues and prevent the furnace wall from being rapidly cooled (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

[0008] However, in the aforementioned furnace, not only is it necessary to install a foaming device facing the inside of the furnace to generate foam, but it is also necessary to mix foaming agent with water to form a foaming solution and supply it to the foaming device, which increases the cost of the furnace.

[0009] The present invention aims to solve the problems of conventional furnaces such as incinerators and heat treatment furnaces, and to provide a refractory material and a method for manufacturing the same that does not crack or peel off from the substrate even when heated to a high temperature and then rapidly cooled. [Means for solving the problem]

[0010] To that end, the refractory material of the present invention contains at least sodium silicate, potassium silicate, Snowtex, wood clay, and Beston as materials to reduce the expansion and contraction rate of the refractory material, and further reduces the expansion and contraction rate of the refractory material by adding a mineral colloid consisting only of bentonite and quartz, and is composed of a mixture of a liquid heat-resistant binder and a refractory powder containing at least Beston, milk casein, and perlite. [Effects of the Invention]

[0011] According to the present invention, the refractory material contains at least sodium silicate, potassium silicate, Snowtex, wood clay, and Beston as materials to reduce the expansion and contraction rate of the refractory material, and further reduces the expansion and contraction rate of the refractory material by adding a mineral colloid consisting only of bentonite and quartz, which is a mixture of a liquid heat-resistant binder and a refractory powder containing at least Beston, milk casein, and perlite.

[0012] In this case, the liquid heat-resistant binder contains at least sodium silicate, potassium silicate, Snowtex, wood-grain clay, and Beston, and also has mineral colloids added, resulting in extremely low expansion and contraction rates for the refractory material.

[0013] Therefore, even if it is heated to a high temperature and then rapidly cooled, it will not crack or peel off from the substrate. [Brief explanation of the drawing]

[0014] [Figure 1] This is a cross-sectional view of a main part showing an example of an incinerator in which a refractory material is used in the furnace wall according to the first embodiment of the present invention. [Figure 2] This is a cross-sectional view of a main part showing an example of an incinerator in which a refractory material is used in the furnace wall according to a second embodiment of the present invention. [Figure 3] This is a cross-sectional view showing an example of a heat treatment furnace in which a refractory material is used in the furnace wall according to a third embodiment of the present invention. [Figure 4] This is a conceptual diagram of a heating device for demonstration testing to heat a test subject to a high temperature. [Modes for carrying out the invention]

[0015] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0016] Figure 1 is a cross-sectional view of a main part showing an example of an incinerator in which a refractory material is used in the furnace wall according to the first embodiment of the present invention.

[0017] In the figure, 11 is an incinerator as a furnace, 12 is industrial waste as the material to be incinerated by the incinerator 11, 14 is the furnace wall, 18 is the incineration chamber as a furnace room formed by being surrounded by the furnace wall 14, 21 is a grate as a firebed, Tx is a temperature sensor as a temperature detection unit placed at a predetermined location on the grate, and 25 is an air supply duct as an air supply device that supplies air to the incineration chamber 18. A burner (not shown) is placed facing the incineration chamber 18 as a combustion device for burning the industrial waste 12.

[0018] Further, reference numeral 31 denotes a water injection nozzle as a water injection device that faces into the incineration chamber 18 and injects water toward the residue. The water injection nozzle 31 is connected to a water reservoir 35 via a water supply pipe 33, and an on-off valve 37 as a water supply valve is disposed in the water supply pipe 33 so as to be openable and closable.

[0019] By the way, when incinerating industrial waste 12 in the incinerator 11, combustion shells, ash, etc. remain and accumulate as residues in the incineration chamber 18. Therefore, the residues are scraped out from the incineration chamber 18 every time a certain amount is reached, and are transported by a transport vehicle to a disposal site for the residues, an ash recycling factory, etc., and finally processed.

[0020] In that case, even if the incinerator 11 is stopped, if the residues continue to burn and the residues cannot be scraped out from the incineration chamber 18, the incineration efficiency of the incinerator 11 will be significantly reduced. Therefore, in the present embodiment, when the incinerator 11 is stopped, the on-off valve 37 is opened, and water is injected from the water injection nozzle 31 toward the residues.

[0021] Further, the temperature of the residues on the fire grate 21 is detected by a temperature sensor Tx, and when the temperature reaches a suitable temperature for scraping out from the incineration chamber 18, the on-off valve 37 is closed, and the injection of water from the water injection nozzle 31 is stopped.

[0022] By the way, when the furnace wall 14 is formed of a conventional refractory brick, for example, a refractory brick having a refractoriness of SK-32 defined by JIS, if water hits the refractory brick and the refractory brick is rapidly cooled, cracks will occur in the refractory brick and the furnace wall 14 will be damaged.

[0023] Therefore, in the present embodiment, the furnace wall 14 is formed by a refractory brick layer 43 and a furnace cover 44 as an exterior body surrounding the outer surface of the refractory brick layer 43, and the refractory brick layer 43 is formed by laminating refractory bricks of the present invention, that is, refractory bricks as the first refractory material, which do not crack even if water hits and is rapidly cooled.

[0024] Next, the method for producing the refractory castable and refractory bricks of the present invention will be described.

[0025] In this embodiment, a refractory powder is mixed with a liquid heat-resistant binder to produce a mortar-like refractory castable. This refractory castable is then poured into a mold, pressurized to the required pressure, and then released, thereby producing a refractory brick with a low expansion and contraction rate.

[0026] First, a method for producing a liquid heat-resistant binder by mixing and stirring several predetermined materials will be described.

[0027] To that end, prepare 15 parts by weight or more and 35 parts by weight or less of sodium silicate (Na2O·nSiO2·KH2O n=2.8~3.3), 10 parts by weight or more and 20 parts by weight or less of potassium silicate (K2O·nSiO2·KH2O n=1.9~3.7), 2 parts by weight or more and 8 parts by weight or less of Snowtex, 0.1 parts by weight or more and 0.4 parts by weight or less of mineral colloid (Benger 31), 4.5 parts by weight or more and 8 parts by weight or less of water, 0.5 parts by weight or more and 4.5 parts by weight or less of Kibushi clay, and 0.5 parts by weight or more and 4.5 parts by weight or less of Beston.

[0028] Of the aforementioned materials, sodium silicate, potassium silicate, Snowtex, mineral colloid, wood clay, and Beston are included at least to reduce the expansion and contraction rate of the refractory brick of the present invention, and mineral colloid is included as an additive to further reduce the expansion and contraction rate of the refractory brick of the present invention, and is not used when manufacturing conventional refractory bricks.

[0029] The aforementioned Snowtex is a mixture containing 30% by weight of amorphous silica and 70% by weight of water.

[0030] Furthermore, the aforementioned mineral colloid contains 99% by weight or more and 100% by weight or less of bentonite, and 0.1% by weight or more and 1% by weight of quartz, and is added to extremely reduce the expansion and contraction rate of the refractory bricks.

[0031] Kibushi clay is produced from lignite layers and contains a large amount of organic matter such as lignite, knots, and tree roots. Because the particles are fine and the amount of quartz is small, it has high fire resistance.

[0032] Beston is a waterproofing admixture for concrete and mortar, and is composed of silicon dioxide (SiO2), aluminum oxide (Al2O3), iron oxide (Fe2O3), magnesium oxide (MgO), calcium oxide (CaO), etc.

[0033] Then, add 15 parts by weight or more and 35 parts by weight of sodium silicate to the stirring tank, add 10 parts by weight or more and 20 parts by weight of potassium silicate while stirring, and add 2 parts by weight or more and 8 parts by weight of Snowtex while stirring.

[0034] Next, mineral colloid is added to the stirring tank little by little, at a rate of 0.1 parts by weight or more and 0.4 parts by weight or less, while stirring, and then water is added all at once, at a rate of 4 parts by weight or more and 8 parts by weight or less, while stirring.

[0035] Then, once the mineral colloid spheres are gone, add 0.5 parts by weight or more and 4.5 parts by weight or less of Kibushi clay and 0.5 parts by weight or more and 4.5 parts by weight or less of Beston to the stirring tank, and continue stirring continuously for 2 hours or more.

[0036] In this way, a liquid heat-resistant binder is manufactured.

[0037] For example, using 25 parts by weight of sodium silicate, 15 parts by weight of potassium silicate, 5 parts by weight of Snowtex, 0.2 parts by weight of mineral colloid, 6 parts by weight of water, 1.5 parts by weight of wood clay, and 1.5 parts by weight of Beston, a heat-resistant binder of 54.2 parts by weight is produced, containing 46.12% by weight of sodium silicate, 27.67% by weight of potassium silicate, 9.23% by weight of Snowtex, 0.37% by weight of mineral colloid, 11.07% by weight of water, 2.77% by weight of wood clay, and 2.77% by weight of Beston.

[0038] Next, a method for producing refractory powder by mixing, stirring, and kneading several predetermined materials will be described.

[0039] To that end, prepare 3 parts by weight or more and 7 parts by weight or less of Portland cement, 1 part by weight or more and 4 parts by weight or less of kaolin (hydrated aluminum silicate), 0.1 parts by weight or more and 2 parts by weight or less of Beston, 0.05 parts by weight or more and 0.15 parts by weight or less of sodium carbonate Na2CO3 (soda ash), 0.05 parts by weight or more and 0.15 parts by weight or less of metholose (hydroxypropyl methylcellulose), 0.1 parts by weight or more and 2 parts by weight or less of milk casein (acid casein), 1 part by weight or more and 5 parts by weight or less of perlite, 5 parts by weight or more and 20 parts by weight or less of aluminum oxide Al2O3, and 5 parts by weight or more and 20 parts by weight or less of refractory mortar.

[0040] Of the aforementioned materials, beston, milk casein, and perlite are included at least to reduce the expansion and contraction rates of the refractory brick of the present invention, and sodium carbonate and metholose are included as additives to further reduce the expansion and contraction rates of the refractory brick of the present invention, and are not used in the manufacture of conventional refractory bricks.

[0041] The aforementioned Portland cement is a mixture of clinker, which consists of calcium silicate 3CaO·SiO2, 2CaO·SiO2, calcium aluminate 3CaO·Al2O3, iron aluminate 4CaO·Al2O3·Fe2O3, etc., and gypsum, which consists of calcium sulfate CaSO4·2H2O.

[0042] Kaolin is a white, fine powder containing silicon dioxide (SiO2) and aluminum oxide (Al2O3), with a melting point of 1600°C or higher.

[0043] Also, sodium carbonate (Na2CO2) 3、 Metrones are added to significantly reduce the expansion and contraction rates of refractory bricks.

[0044] Perlite is a granular material consisting of obsidian, amorphous silica, crystalline silica, etc., with a particle size of 2 mm or more and 5 mm or less. Furthermore, when a mixture of Portland cement, kaolin, beston, sodium carbonate (Na2CO3), metholose, and milk casein is used as a cement mixture, perlite is used as 30% by weight of the cement mixture, and aluminum oxide (Al2O3) and mortar are both used as the weight of the cement mixture plus the weight of perlite.

[0045] Furthermore, refractory mortar is a mixture consisting of aluminum oxide (Al2O3), iron oxide (Fe2O3), and silicon dioxide (SiO2).

[0046] Then, add 3 parts by weight or more and 7 parts by weight of Portland cement, 1 part by weight or more and 4 parts by weight of kaolin, 0.1 parts by weight or more and 2 parts by weight of beston, 0.05 parts by weight or more and 0.15 parts by weight of sodium carbonate (Na2CO3), 0.05 parts by weight or more and 0.15 parts by weight of metholose, and 0.1 parts by weight or more and 2 parts by weight of milk casein to the mixer, stir for 30 minutes or more, and after mixing, add 1 part by weight or more and 5 parts by weight of perlite, 5 parts by weight or more and 20 parts by weight of aluminum oxide (Al2O3), and 5 parts by weight or more and 20 parts by weight of refractory mortar, and mix.

[0047] In this way, refractory powder is manufactured.

[0048] Furthermore, if 5 parts by weight of Portland cement, 2.5 parts by weight of kaolin, 0.5 parts by weight of beston, 0.1 parts by weight of sodium carbonate (Na2CO3), 0.1 parts by weight of metholose, and 0.5 parts by weight of milk casein are used, the cement mixture will be 8.7 parts by weight, perlite 2.6 parts by weight, aluminum oxide (Al2O3) and mortar 11.3 parts by weight, and refractory powder 33.9 parts by weight.

[0049] In the cement mixture, Portland cement accounts for 57.47% by weight, kaolin for 28.73% by weight, beston for 5.75% by weight, sodium carbonate (Na2CO3) for 1.15% by weight, metholose for 1.15% by weight, and milk casein for 5.75% by weight.

[0050] Next, once the liquid heat-resistant binder and refractory powder are produced in this manner, 2 parts by weight of the refractory powder, 1.2 parts by weight of the heat-resistant binder, and 0.024 parts by weight of the hardener are prepared in order to produce refractory bricks.

[0051] Next, 2 parts by weight of refractory powder and 0.024 parts by weight of hardener are added to a mixing container, and after the powders are thoroughly mixed, half of the liquid heat-resistant binder (0.6 parts by weight) is added and mixed until it is almost powdery, and then the remaining 0.6 parts by weight of the liquid heat-resistant binder is added and mixed thoroughly.

[0052] In this way, the fire-resistant castable of the present invention, that is, a mortar-like fire-resistant castable as a second fire-resistant material, can be manufactured.

[0053] Next, the refractory castable is poured into a mold, pressurized to the required pressure, demolded after 2-3 days, and then air-dried for another 3-5 days to produce the refractory bricks used as the first refractory material.

[0054] In this case, refractory bricks can be manufactured by natural drying without firing, thus lowering the cost of refractory bricks.

[0055] Next, an incinerator equipped with a furnace wall formed using the mortar-like refractory castable of the present invention will be described.

[0056] Figure 2 is a cross-sectional view of a key part showing an example of an incinerator in which a refractory material is used in the furnace wall according to a second embodiment of the present invention.

[0057] In the diagram, 11 is the incinerator as a furnace, 12 is the industrial waste to be incinerated, 54 is the furnace wall, 18 is the incineration chamber formed by being surrounded by the furnace wall 54, 21 is the grate as the hearth, Tx is the temperature sensor as the temperature detection unit, and 25 is the air supply duct as the air supply device. A burner (not shown) is positioned facing the incineration chamber 18.

[0058] Furthermore, 31 is a water injection nozzle for a water injection device, 33 is a water supply pipe, 35 is a water storage container, and 37 is an on / off valve for a water supply valve.

[0059] In this embodiment, the furnace wall 54 is formed by a refractory brick layer 55, a refractory castable layer 56, and a furnace cover 44 as an outer covering that surrounds the outer surface of the refractory brick layer 55.

[0060] The refractory brick layer 55 is formed by laminating conventional refractory bricks, for example, refractory bricks with a refractory rating of SK-32, and the refractory castable layer 56 is formed by applying the mortar-like refractory castable of the present invention to the surface of the refractory brick layer 55 in an area of ​​30 mm or more and 60 mm or less.

[0061] The fire-resistant castable coating is applied by methods such as trowel application using a plasterer's trowel or spray application using a spray machine.

[0062] The mortar-like refractory castable of the present invention is manufactured by kneading refractory powder with a liquid heat-resistant binder manufactured in the first embodiment.

[0063] Next, a third embodiment of the present invention will be described.

[0064] Figure 3 is a cross-sectional view showing an example of a heat treatment furnace in which a refractory material is used in the furnace wall according to a third embodiment of the present invention.

[0065] In the figure, 61 is a heat treatment furnace, and 62 is a steel material to be treated by the heat treatment furnace 61, such as quenching. The heat treatment furnace 61 consists of a furnace body 61a and a door (hatch) 61b that is installed to the furnace body 61a so as to be openable and closable.

[0066] Furthermore, 64 is the furnace wall, 68 is the heat treatment chamber formed by the furnace wall 64, 71 is a support stand for supporting and transporting the steel material 62, and Ty is a temperature sensor that serves as a temperature detection unit and is located on the support stand 71. A burner (not shown) is placed facing the heat treatment chamber 68 as a heat source.

[0067] Incidentally, if the furnace wall 64 is made of conventional refractory bricks, for example, refractory bricks with a refractory rating of SK-32, when the heat treatment is completed and the door 61b is opened, cold air from outside the furnace enters the heat treatment chamber 68 and rapidly cools the furnace wall 64, causing cracks to form in the refractory bricks and damaging the furnace wall 64.

[0068] Therefore, in this embodiment, the furnace wall 64 is formed by a refractory brick layer 73 and a furnace cover 74 as an outer covering that surrounds the outer surface of the refractory brick layer 73, and the refractory brick layer 73 is formed by laminating the refractory brick of the present invention, that is, the refractory brick as the first refractory material, which does not crack even when rapidly cooled.

[0069] The refractory brick is manufactured by mixing refractory powder with a liquid heat-resistant binder manufactured in the first embodiment to produce a mortar-like refractory castable, pouring the refractory castable into a mold, pressurizing it with the required pressure, and then demolding it.

[0070] In this embodiment, the furnace wall 64 is formed by a refractory brick layer 73 and a furnace cover 74 surrounding the outer surface of the refractory brick layer 73. However, the furnace wall can also be formed by a refractory brick layer formed by laminating conventional refractory bricks, for example, refractory bricks with a refractory grade of SK-32, a refractory castable layer formed by applying a mortar-like second refractory material, a refractory castable, to the surface of the refractory brick layer, and a furnace cover surrounding the outer surface of the refractory brick layer.

[0071] Next, we will describe the test results when conventional refractory bricks, the refractory bricks of the present invention used in the refractory brick layers 43 and 73 arranged in the furnace walls 14 and 74 in the first and third embodiments, and the refractory castable of the present invention used in the refractory castable layer 73 in the second embodiment were used as test subjects, and the durability of the test subjects was demonstrated by heating them to a high temperature and rapidly cooling them.

[0072] Figure 4 is a conceptual diagram of a heating furnace for demonstration tests to heat the test subjects to a high temperature.

[0073] In the figure, 80 is the test subject, 81 is a heating furnace for a demonstration test that heats the test subject 80 to a radiation temperature of 1150 [°C], and Tz is a temperature sensor that serves as a temperature detection unit for measuring the radiation temperature of the test subject 80.

[0074] The heating furnace 81 includes a support section 83 at the top for supporting the specimen 80, an opening 85 on the side for introducing combustion air, and a combustion chamber 88 inside which serves as a furnace chamber for burning charcoal 87.

[0075] A blower 89 is positioned facing the opening 85 to supply combustion air to the combustion chamber 88.

[0076] In this case, a conventional refractory brick with a refractoriness of SK-32 was designated as the first test subject 80, a conventional refractory brick with a refractoriness of SK-32 was used as a base, and a conventional refractory castable was applied to the conventional refractory brick to a thickness of 30 mm was designated as the second test subject 80, the refractory brick of the present invention used in the refractory brick layers 43 and 73 in the first and third embodiments was designated as the third test subject 80, a conventional refractory brick with a refractoriness of SK-32 was used as a base, and a conventional refractory castable of the present invention used in the refractory castable layer 73 in the second embodiment was applied to the conventional refractory brick was designated as the fourth test subject 80, and a conventional refractory brick with a refractoriness of SK-32 was used as a base, and a refractory castable of the present invention used in the refractory castable layer 73 in the second embodiment was applied to the refractory brick of the present invention was designated as the fifth test subject 80.

[0077] Next, we will explain the test results of the durability tests conducted on each of the 80 test subjects, from the 1st to the 5th. Regarding the first subject, 80 After heating the first sample 80 to 1150°C for 60 minutes, it was removed from the heating furnace 81, and when room temperature water was poured over it and the steam subsided, the first sample 80 was observed and found to have cracks throughout the entire conventional refractory brick. Subsequently, the first sample 80 was returned to the heating furnace 81 and heated again for 60 minutes, then removed from the heating furnace 81, and when room temperature water was poured over it, it shattered and lost its original shape. Regarding the second subject, 80 After heating the second test subject 80 to 1150°C for 60 minutes, it was removed from the heating furnace 81, and when room temperature water was poured over it and the steam subsided, the second test subject 80 was observed and found that the conventional refractory castable had crumbled and peeled away from the conventional refractory brick, and cracks had formed throughout the conventional refractory brick. Regarding the third subject, Subject 80 After heating the third sample 80 to 1150°C for 60 minutes, it was removed from the heating furnace 81, and after pouring room temperature water over it and the steam subsided, the third sample 80 was observed and found that no cracks had occurred in the refractory bricks of the present invention in the refractory brick layers 43 and 73. Subsequently, the third sample 80 was returned to the heating furnace 81 and heated for 120 minutes, then removed from the heating furnace 81, and after pouring room temperature water over it and the steam subsided, the third sample 80 was observed and found that no cracks had occurred in the refractory bricks of the present invention in the refractory brick layers 43 and 73. Furthermore, the third sample 80 was returned to the heating furnace 81 and heated for 180 minutes, then removed from the heating furnace 81, and after pouring room temperature water over it and the steam subsided, the third sample 80 was observed and found that no cracks had occurred in the refractory bricks of the present invention in the refractory brick layers 43 and 73.

[0078] Subsequently, the third subject 80 was subjected to seven heating and cooling cycles of 60 minutes each. Each time, the third subject 80 was observed, and no cracks were found in the refractory bricks of the present invention in the refractory brick layers 43 and 73. Regarding the fourth subject, Subject 80 Similar to the third subject 80, the fourth subject 80 was subjected to heating and cooling for 60 minutes, 120 minutes, and 180 minutes, followed by 60 minutes of heating and cooling seven times. Each time, the fourth subject 80 was observed, and it was found that the refractory castable layer 73 of the present invention had not peeled off from the conventional refractory brick, and no cracks had occurred in the conventional refractory brick. Regarding the 5th subject, Subject 80 Similar to the third subject 80, the fifth subject 80 was subjected to heating and cooling for 60 minutes, 120 minutes, and 180 minutes, followed by 60 minutes of heating and cooling seven times. Each time, the fifth subject 80 was observed, and it was found that the refractory castable layer 73 of the present invention had not peeled off from the refractory brick layers 43 and 73 of the present invention, and no cracks had occurred in the refractory bricks of the present invention.

[0079] In this embodiment, the refractory castable of the present invention is produced by mixing, stirring, and kneading a liquid heat-resistant binder containing at least sodium silicate, potassium silicate, Snowtex, wood clay, and Beston with a refractory powder containing at least Beston, milk casein, and perlite, and then placing the refractory castable into a mold and drying it to produce the refractory brick of the present invention.

[0080] Therefore, in this embodiment, even if the refractory bricks are heated to a high temperature and then rapidly cooled, cracks will not occur in the refractory bricks, and the refractory castable will not peel off from the substrate, such as refractory bricks with a fire resistance of SK-32.

[0081] It should be noted that the present invention is not limited to the embodiments described above, and can be modified in various ways based on the spirit of the present invention, without excluding them from the scope of the present invention. [Explanation of symbols]

[0082] 11 Incinerator 14, 54, 64 Furnace wall 43, 73 refractory brick layer 56 Fire-resistant castable layer

Claims

1. A refractory material characterized by comprising a mixture of a liquid heat-resistant binder containing at least sodium silicate, potassium silicate, Snowtex, wood clay, and Beston as materials to reduce the expansion and contraction rate of the refractory material, and to which a mineral colloid consisting only of bentonite and quartz is added to further reduce the expansion and contraction rate of the refractory material, and a refractory powder containing at least Beston, milk casein, and perlite.

2. The fire-resistant material according to claim 1, which is placed in a mold and dried to become a fire-resistant brick.

3. The fire-resistant material according to claim 1, which is formed in a mortar-like state and made into a fire-resistant castable.

4. A method for producing a refractory material, characterized by mixing a liquid heat-resistant binder containing at least sodium silicate, potassium silicate, Snowtex, wood clay, and Beston as materials to reduce the expansion and contraction rate of the refractory material, and to which a mineral colloid consisting only of bentonite and quartz is added to further reduce the expansion and contraction rate of the refractory material, with a refractory powder containing at least Beston, milk casein, and perlite, stirring, kneading, placing in a mold, and drying.

5. A method for producing a refractory material, characterized by mixing a liquid heat-resistant binder containing at least sodium silicate, potassium silicate, Snowtex, wood clay, and Beston as materials to reduce the expansion and contraction rate of the refractory material, and to which a mineral colloid consisting only of bentonite and quartz is added to further reduce the expansion and contraction rate of the refractory material, with a refractory powder containing at least Beston, milk casein, and perlite, stirring, kneading, and forming a mortar-like substance.

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