JP6466124B2 - Firing body and method for producing the same - Google Patents

Description

  The present invention relates to a fired body and a method for producing the same, and more particularly to a fired body used for an outer wall material and a method for producing the same.

  The appearance of the outer wall material is important. As such an outer wall material, for example, Japanese Patent No. 3491991 (Patent Document 1) is cited. In this patent document 1, a cement-based large-sized material is characterized by kneading / molding a composition containing cement as a main material, curing, drying, and firing to mainly generate wollastonite and anorthite in a matrix portion. A method for manufacturing a fired building material is disclosed.

Japanese Patent No. 3491991

  However, since the cement-type large-sized fired building material manufactured by the said patent document 1 uses the main material containing a cement, suppression of the white flower by a cement component is not enough. For this reason, the sintered body which does not produce white flower while maintaining the characteristics is desired.

  Then, this invention makes it a subject to provide the sintered body which has a high characteristic, and does not produce white flower, and its manufacturing method.

  The inventor of the present invention has focused on the fact that a fired body obtained by firing a material containing clay and cement is prone to white blossom due to a cement component and has a problem in appearance. Therefore, as a result of diligent research to realize a fired body having high characteristics by firing a material that does not contain cement, it is possible to reduce the weight even if it is solid by foaming using a vitreous material. I found that I can do it. However, the present inventor has revealed for the first time that when the proportion of the vitreous material is increased, internal bubbles do not escape and blisters due to the bubbles appear on the surface (abnormal foaming). And this inventor discovered that this unusual foaming originates in a vitreous component forming a film | membrane on the surface before internal foaming advances at the time of baking. Therefore, as a means for suppressing abnormal foaming, the inventors conceived of firing a mixture containing a porous material in order to easily remove bubbles generated by foaming, and found a composition that can suppress abnormal foaming. Completed.

  That is, the fired body of the present invention is obtained by firing a clay-based material, a glassy material, and a porous material. The clay-based material is contained in a mass ratio of 35% to 40%. The glassy material is contained in a mass ratio of 50% to 60%. The porous material is contained in a mass ratio of 5% to 10%.

  The method for producing a fired body of the present invention comprises a step of preparing a clay-based material, a glassy material, and a porous material, a clay-based material, a glassy material, and a porous material, The method includes a step of obtaining a mixture and a step of firing the mixture. In the step of preparing, a clay-based material contained in a mass ratio of 35% to 40%, a vitreous material contained in a mass ratio of 50% to 60%, and a mass ratio of 5% to 10%. Prepare a porous material.

  According to the fired body and the method for producing the same of the present invention, since no cement component is contained, white flower can be suppressed. Even if the glassy material is contained in a mass ratio of 50% or more and 60% or less, when the porous material is contained in an amount of 5% or more and 10% or less, the foaming gas generated at the time of firing can be reduced in the voids of the porous material. Can escape to the outside. For this reason, abnormal foaming can be suppressed. Further, by firing a clay material of 35% or more and 40% or less, a glassy material of 50% or more and 60% or less, and a porous material of 5% or more and 10% or less, the vitreous material becomes a fired body. A film is formed on the surface, and a film is formed on the inner wall of the void of the porous material. For this reason, since it can suppress that a water | moisture content penetrate | invades inside, frost damage resistance can be improved. Therefore, the fired body of the present invention has high characteristics and can suppress white flower.

  Preferably, in the fired body of the present invention, the clay-based material has clay contained in a mass proportion of 20% to 35% and bentonite contained in a mass proportion of 5% to 15%.

  In the method for producing a fired body according to the present invention, preferably, in the step of preparing, the clay having a clay containing 20% to 35% by mass and bentonite containing 5% to 15% by mass. Prepare system materials.

  Thereby, the mixture formed by mixing the clay-based material, the glassy material, and the porous material can be easily extruded.

  Preferably, in the fired body of the present invention, the porous material is at least one material selected from the group consisting of scoria, zeolite, and Hyuga soil.

  In the method for producing a fired body of the present invention, preferably, in the step of preparing, one kind of porous material selected from the group consisting of scoria, zeolite, and Hyuga soil is prepared.

  These materials can effectively release the foam gas generated during firing to the outside. For this reason, the characteristic of a sintered body can be improved more.

  Preferably, in the method for producing a fired body according to the present invention, the step of obtaining the mixture includes the step of obtaining a kneaded product by kneading the clay-based material, the vitreous material, and the porous material. A step of obtaining a cylindrical kneaded product by extrusion molding into a cylindrical shape, and a step of obtaining a plate-like kneaded product by cutting in a longitudinal direction from one end to the other end of the cylindrical kneaded product and rolling. Including. Thus, the fired body of the present invention can also be produced by extrusion molding.

  Preferably, in the fired body of the present invention, the fired body has a plate-like shape and includes a fired product of a main material and a fired product of a porous material, and the surface is made of a fired product of a glassy material. A film is formed. Preferably, in the method for producing a fired body of the present invention, in the firing step, the mixture is fired so that the glassy material is foamed to form a film on the surface. Thereby, a film made of a glassy material is formed on the surface of the fired body.

  Further, from the viewpoint of improving the characteristics, in the fired body of the present invention, a film of a fired product of a vitreous material is preferably formed on the inner wall of the void of the porous material. Similarly, in the method for producing a fired body of the present invention, preferably, in the firing step, the mixture is fired so as to foam the glass and form a film on the inner wall of the porous material.

  INDUSTRIAL APPLICABILITY The present invention can provide a fired body having high characteristics and producing no white flower and a method for producing the same.

It is a flowchart which shows the manufacturing method of the sintered body of embodiment of this invention. It is a schematic diagram which shows the manufacturing process of the sintered body of embodiment of this invention. It is a cross-sectional schematic diagram which shows the plate-shaped sintered body of embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

(Embodiment)
With reference to FIGS. 1-3, the sintered body of one Embodiment of this invention is demonstrated. The fired body of the embodiment of the present invention is formed by firing a clay-based material, a glassy material, and a porous material (main material).

  The main material is a material that is the base of the fired body, and is not particularly limited as long as it includes a clay-based material, a glassy material, and a porous material, and is composed of a clay-based material, a glassy material, and a porous material. Alternatively, other materials such as a refractory material and an inorganic material may be further included.

  The clay-based material is an indispensable material for the plate-like fired body, and can use clay, bentonite, kaolin and the like.

  The clay-based material is contained in a mass proportion of 35% to 40%, and has a clay contained in a mass proportion of 20% to 35% and a bentonite contained in a mass proportion of 5% to 15%. It is preferable. In addition, clay is a cocoon clay, kaolin, etc., and a cocoon clay is preferable.

  The glassy material is a material that melts and foams during firing and forms a film inside the void, and plays a role of a binder. Bottle glass, plate glass, and the like can be used as the glassy material, and it is preferable to use recycled glass.

  The glassy material is contained in the main material in a mass ratio of 50% to 60%, preferably 55% to 60%, more preferably more than 55% and 60% or less.

  The porous material is an inorganic material having voids and is in a pumice state. As the porous material, for example, scoria, zeolite, Hyuga soil, cast iron slag and the like can be used, and preferably at least one material selected from the group consisting of scoria, zeolite, and Hyuga soil.

  The porous material is contained in the main material in a mass ratio of 5% to 10%.

  The refractory material is a material that improves the strength of the fired body. For example, cordierite, petalite, or the like can be used.

  An inorganic material is contained as needed for the purpose of ensuring the strength required in the drying process of the fired body and for the purpose of cooling cracking immediately after firing. As the inorganic material, for example, Kamato feldspar can be used.

  When other materials such as a refractory material and an inorganic material are contained in the main material, the total of the other materials is contained in the main material in a proportion of more than 0% and not more than 10%.

  In addition to the main material, additives may be further mixed and fired. The additive is not particularly limited, and may include a foaming aid, a pigment, an organic material, and the like.

  For example, silicon carbide or soda ash can be used as the foaming aid. The foaming assistant is preferably contained in an amount of 2 parts or less with respect to 100 parts of the main material, and is preferably contained in an amount of 0.05 parts or less with respect to 100 parts of the glassy material.

  The pigment is a material for adjusting the color tone of the fired body, and manganese dioxide, vanadium oxide, or the like can be used. The pigment is preferably contained in an amount of 3 parts or less by mass with respect to 100 parts of the main material.

  The organic material is a material that forms voids in the fired body by disappearing during firing. For example, walnut shell, rice husk, sawdust, etc. can be used.

  The fired body of the present invention may be fired by adding 15 parts or more and 20 parts or less of water to 100 parts of the main material in addition to the main material and the additive.

  The fired body of the present embodiment has, for example, a specific gravity of 1.6 or less, a bending strength of 16 MPa or more, and a water absorption of 5% or less.

  Then, with reference to FIGS. 1-3, the manufacturing method of the sintered body of this Embodiment is demonstrated.

  First, a main material containing the clay-based material, the glassy material, and the porous material as described above is prepared (step S10). In this step (step S10), a clay-based material contained in a mass proportion of 35% to 40%, a vitreous material contained in a mass proportion of 50% to 60%, and a mass proportion of 5% to 10%. The following porous material is prepared.

  In this step (step S10), it is preferable to prepare a clay-based material having clay contained in a mass ratio of 20% to 35% and bentonite contained in a mass ratio of 5% to 15%. .

  Moreover, in this process (step S10), it is preferable to grind | pulverize the particle size of a vitreous material to 0.4 mm or less. The particle size means the maximum length.

  In this step (step S10), as described above, other materials such as a refractory material and an inorganic material may be further prepared.

  Moreover, an additive is prepared (step S20). In addition, in this specification, the mixing | blending of an additive is described by the outer shell. In this step (step S20), as described above, a foaming aid, a pigment, an organic material, or the like may be prepared as an additive. Further, this step (step S20) may be omitted.

  Next, the mixture is obtained by mixing the main material and the additive (step S30). The mixture does not contain cement. This process (step S30) is implemented as follows, for example.

  First, a kneaded product is obtained by kneading the prepared main material and additive (step S31). In this step (step S31), for example, depending on the amount of material, a small mixer or a large mixer is used. In this step (step S31), water may be further added to the main material and the additive to knead them. In this case, 15 parts or more and 20 parts or less of water are further added and kneaded with respect to 100 parts of the main material.

  Next, the kneaded product is extruded into a cylindrical shape to obtain a cylindrical kneaded product 21 as shown in FIG. 2A (step S32). In this step (step S32), for example, the kneaded material is extruded into a cylindrical shape with a kneader. Thereafter, as shown in FIG. 2B, the cylindrical kneaded material 21 is cut in the longitudinal direction from one end to the other end (step S33). The method for cutting is not particularly limited. For example, as shown in FIG. 2B, the cutting member 30 is relatively moved in the direction of the arrow from one end of the thickness portion of the cylindrical kneaded material 21. Thereby, since the cylindrical kneaded material 21 can be developed in a flat plate shape, a flat kneaded material 22 is obtained as shown in FIG. By rolling this flat kneaded material 22, a plate-like kneaded material is obtained (step S34). The method of rolling is not particularly limited, and for example, rolling molding with a roller is performed.

  Next, the mixture (plate kneaded material) is dried (step S40). In this step (step S40), for example, the mixture is dried at 200 ° C. or more and 300 ° C. or less and for 60 minutes or more and 180 minutes or less.

  Next, the mixture (plate-like kneaded material) is fired (step S50). In this step (step S50), the mixture is fired so that the glassy material is foamed to form a film on the surface. As such a condition, for example, the mixture is fired at 1000 ° C. or more and 1200 ° C. or less for 90 minutes or more and 150 minutes or less.

  The step of drying (step S40) and the step of baking (step S50) may be performed continuously. Specifically, the plate-like kneaded material is placed on the conveying member and passed through a drying furnace and a baking furnace. At this time, the cylindrical kneaded material 21 is placed on the conveying member with the surface positioned on the inner peripheral surface facing up.

  In the present embodiment, the time required for the drying step (Step S40) and the baking step (Step S50) is 150 minutes or more and 330 minutes or less in total, and the time for manufacturing the fired body is very short.

  A fired body can be manufactured by performing the above steps (steps S10 to S50). The fired body thus manufactured is a plate-like fired body 10 having a front surface 10a and a back surface 10b opposite to the front surface 10a, as shown in FIG. And a fired product 12 of a vitreous material, a fired product 13 of a porous material, and bubbles 14. A fired product 12 of a vitreous material is formed so as to fill a gap between the fired product 11 of the clay-based material, the fired product 13 of the porous material, and the bubbles 14 contained in the fired body 10. A film 12a of a fired product 12 of glassy material is formed on the surface 10a of the fired body 10, and a film of the fired product 12 of glassy material is formed on the inner wall of the void of the fired product 13 of porous material. Is formed.

  In the present embodiment, the method for producing a fired body by extrusion molding into a cylindrical shape has been described as an example. However, the present invention is not particularly limited thereto, and the kneaded material is formed into a predetermined shape and fired. May be. That is, various methods can be adopted as the method for manufacturing the fired body of the present embodiment.

  In the present embodiment, the method for producing a flat fired body has been described. However, the shape of the fired body is not particularly limited.

  As described above, the fired body of the present embodiment is formed by firing a clay-based material, a glassy material, and a porous material, and the clay-based material is contained in a mass ratio of 35% to 40%. The vitreous material is contained in a mass proportion of 50% or more and 60% or less, and the porous material is contained in a mass proportion of 5% or more and 10% or less. That is, the fired body of the present embodiment is obtained by firing 35 to 40 parts by mass of a clay-based material, 50 to 60 parts by mass of a vitreous material, and 5 to 10 parts by mass of a porous material.

  Moreover, the manufacturing method of the sintered body of the present embodiment includes a step of preparing a clay-based material, a glassy material, and a porous material (step S10), a clay-based material, a glassy material, and a porous material. In the step of preparing (Step S10) including the step of obtaining a mixture by mixing (Step S30) and the step of firing the mixture (Step S50), the content is 35% to 40% by mass. A clay-based material, a vitreous material containing 50% to 60% by mass, and a porous material containing 5% to 10% by mass are prepared.

  According to the fired body and the method for producing the same according to the present invention, no white component is produced because the cement component is not included. For this reason, a favorable external appearance can be maintained.

  Even if the glassy material is contained in a mass ratio of 50% or more and 60% or less, when the porous material is contained in an amount of 5% or more and 10% or less, the foaming gas generated at the time of firing can be reduced in the voids of the porous material. Can escape to the outside. For this reason, abnormal foaming can be suppressed and a favorable external appearance can be maintained. Moreover, since a space | gap is formed inside by making it foam, the weight reduction of a sintered body can be achieved. In this way, a solid fired body can be realized by having a void inside without forming a hollow fired body for weight reduction, so that the strength can be increased.

  Moreover, by baking the main material containing 50% or more and 60% or less of a vitreous material, the vitreous material forms a film on the surface and forms a film on the inner wall of the void of the porous material. For this reason, since it can suppress that a water | moisture content penetrate | invades inside and can improve the intensity | strength by a glassy material, frost damage resistance can be improved. In addition, the vitreous material film formed on the surface produces gloss, so that the appearance can be improved. Furthermore, when dirt adheres to the surface of the fired body, the dirt can be easily washed away by the film made of the vitreous material formed on the surface.

  Further, when the clay-based material is less than 35% by mass in the main material, cracks may occur when performing cylindrical extrusion molding. In this embodiment, the clay-based material is contained in the main material. Therefore, as described above, cylindrical extrusion molding is possible. On the other hand, when the clay-based material is contained in the main material in an amount of 40% or less, the main material can contain a large amount of glassy material, and thus the above-described effect is exhibited.

  Moreover, by firing the main materials and additives in the above amounts, a ceramic-like fired body can be obtained without painting. For this reason, durability is high and can give a high-class feeling.

  Therefore, in the present embodiment, a fired body that has high characteristics and does not generate white flower can be realized, and therefore, it is preferably used for an outer wall material. In this case, the fired body of the present embodiment can be used as a lightweight and large-sized outer wall surface material. In addition, since the fired body of the present embodiment is solid, sealing of the outer wall surface material joint portion can be easily performed as compared with a hollow fired body.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated in detail, this invention is not limited to these.

Example 1
In Example 1, a fired body was manufactured according to the embodiment described above. Specifically, first, a main material containing a clay-based material, a glassy material, and a porous material was prepared (step S10). As the clay-based material, it consisted of cocoon clay contained in the main material by 35% by mass and bentonite contained in the main material by 5% by mass. The vitreous material was bottle glass contained 55% by mass in the main material. The porous material was scoria containing 5% by mass in the main material.

  Moreover, the additive material was prepared (step S20). As the additive, 2 parts of soda ash and 2.5 parts of manganese dioxide were prepared with respect to 100 parts of the main material.

  Next, the mixture was obtained by mixing a main material and an additive (step S30). This process (step S30) was implemented as follows, for example.

  First, a kneaded product was obtained by kneading the prepared main material and additive and 15 parts of water with respect to 100 parts of the main material with a large mixer (step S31). Next, the kneaded product was extruded into a cylindrical shape with a vacuum kneader to obtain a cylindrical kneaded product 21 having a thickness of 35 mm (step S32). Thereafter, the cylindrical kneaded product 21 was cut in the longitudinal direction from one end to the other end, and the cylindrical kneaded product 21 was developed into a flat plate shape (step S33). The obtained flat kneaded material 22 was rolled with a roller to obtain a plate kneaded material having a thickness of 15 mm (step S34).

  Next, the plate-like kneaded material was dried at 250 ° C. for 150 minutes (step S40). Next, the plate-like kneaded product was fired (step S50). In this step (step S50), the surface located on the inner peripheral surface of the cylindrical kneaded material 21 was faced up and baked at 1050 ° C. for 120 minutes. The fired body of Example 1 was manufactured by carrying out the above steps (Steps S10 to S50).

(Comparative Example 1)
The method for producing the fired body of Comparative Example 1 was basically the same as that of Example 1. However, the firing conditions in the firing step (Step S50) and the blending amounts of the main material and the additive were as shown in the table below. As shown in FIG. Specifically, as a main material, 35% by weight of clay as a clay material and 5% bentonite as a clay-based material, 20% bottle glass as a vitreous material, and a refractory material. 30% cordierite and 10% scoria as a porous material. As an additive, 5 parts of walnut shells were prepared for 100 parts of the main material.

  Moreover, as baking conditions of the comparative example 1, temperature was 1150 degreeC and time was 120 minutes.

(Comparative Example 2)
The method for producing the fired body of Comparative Example 2 was basically the same as that of Example 1, but the firing conditions in the firing step (Step S50) and the blending amounts of the main material and the additive were as shown in the table below. As shown in FIG. Specifically, as a main material, 35% by weight of clay as a clay material and 5% bentonite as a clay material, 50% bottle glass as a vitreous material, and an inorganic material by mass ratio in the main material As 10% of Kamado feldspar.

  Further, as an additive, 0.05 part of silicon carbide and 3 parts of soda ash as a foaming aid and 0.5 part of vanadium oxide as a pigment were prepared with respect to 100 parts of the main material.

  Moreover, as baking conditions of the comparative example 2, temperature was 1040 degreeC and time was 90 minutes.

(Evaluation method)
For the fired bodies of Example 1 and Comparative Examples 1 and 2, the appearance was observed, and the frost damage resistance, specific gravity, bending strength, and water absorption were measured.

  Evaluation of frost damage resistance was performed by a freeze-thaw test by the method of thawing in air in frozen water in JIS A 1435. Specifically, a freeze-thaw test was performed in which the specimen that had been absorbed before the start of the test was frozen in a gas environment at -20 ° C and then thawed in water at + 20 ° C. The conditions such as swelling and peeling were confirmed, and 300 cycles were repeated. The results are shown in Table 2 below.

  The specific gravity was measured according to JIS A 5430. The bending strength was measured according to JIS A 1408. The water absorption was measured according to JIS A 5430. These results are shown in Table 2 below.

(Measurement result)
Since the fired bodies of Example 1 and Comparative Examples 1 and 2 did not contain a cement component, white flower did not occur.

  Moreover, as shown in Table 2, the clay-based material is contained in the main material in a mass ratio of 35% to 40%, and the glassy material is contained in the main material in a mass ratio of 50% to 60%. In Example 1, in which the porous material was contained in the main material in a mass ratio of 5% to 10%, the gas generated by the foaming of the vitreous material was discharged to the outside through the voids of the porous material. Therefore, abnormal foaming due to the gas that could not be removed was not observed on the surface of the fired body. Moreover, in Example 1, the water absorption was as low as 5% or less, and it was difficult for water to enter inside. This is presumably because the glassy material formed a film on the surface of the fired body and formed a film on the inner wall of the void of the porous material. In addition, the surface located in the inner peripheral surface of the cylindrical kneaded material 21 in the process of extruding into a cylindrical shape (step S32) was a surface on which a film made of a glassy material was formed. Further, in Example 1, as a result of repeating 300 cycles in the freeze-thaw test, no abnormality was generated, and it was good.

  On the other hand, the fired body of Comparative Example 1 had a high water absorption rate. This is considered to be because a film could not be sufficiently formed on the surface of the fired body and the inner wall of the porous material because there was little glassy material.

  Moreover, although the baking body of the comparative example 2 increased the mixing | blending of the vitreous material, since the porous material was not included, unusual foaming arose on the surface of the baking body. This is because the timing of film formation with the vitreous material on the surface of the fired body does not match the timing of internal foaming, and the part where the gas generated by foaming escapes is lost, and the surface of the fired body is caused by bubbles. This is because a noticeable expansion location occurred. Even in the case of the main material as in Comparative Example 2, if a mixture containing 5 to 10% by weight of the porous material in the main material is baked, air bubbles can be released to the outside by the voids in the porous material. Therefore, the present inventor has obtained the knowledge that such abnormal foaming does not occur.

  Moreover, in order to maintain the clay-based material necessary for extrusion molding into a cylindrical shape, the inventors have studied how far the vitreous material and the porous material can be increased. That is, the clay-based material is contained in a mass proportion of 35% or more and 40% or less, the glassy material is contained in a mass proportion of 50% or more and 60% or less, and the porous material is contained in a mass proportion of 5% or more and 10% or less. By containing, the present invention has obtained the knowledge that abnormal foaming is suppressed and extrusion molding is possible.

  From the above, according to this example, the clay-based material is contained in a mass ratio of 35% to 40%, the vitreous material is contained in a mass ratio of 50% to 60%, and the porous material is a mass. It was confirmed that by containing 5% or more and 10% or less in proportion, it was possible to realize a fired body having high characteristics and producing no white flower.

  It should be understood that the embodiments and examples disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is shown not by the embodiments and examples described above but by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

  DESCRIPTION OF SYMBOLS 10 baked body, 10a surface, 10b back surface, 11 baked product of clay-based material, 12 baked product of glassy material, 12a film, 13 baked product of porous material, 14 bubbles, 21 cylindrical kneaded material, 22 flat plate kneaded material 30 cutting member.

Claims (7)

A clay-based material, a glassy material, and a porous material are fired,
The clay-based material is contained in a mass ratio of 35% to 40%,
The glassy material is contained in a mass ratio of 50% or more and 60% or less,
The porous material contains 5% or more and 10% or less by mass ratio ,
The fired product of the glassy material is formed so as to fill a gap between the fired product of the clay-based material, the fired product of the porous material, and bubbles,
A fired body in which a film of the fired product of the vitreous material is formed on the inner wall of the void of the fired product of the porous material .   The fired body according to claim 1, wherein the clay-based material includes clay contained in a mass ratio of 20% to 35% and bentonite contained in a mass ratio of 5% to 15%.   The fired body according to claim 1 or 2, wherein the porous material is at least one material selected from the group consisting of scoria, zeolite, and Hyuga soil. Preparing a clay-based material, a glassy material, and a porous material;
A step of obtaining a mixture by mixing the clay-based material, the glassy material, and the porous material;
Firing the mixture,
In the step of preparing, the clay-based material contained in a mass proportion of 35% to 40%, the vitreous material contained in a mass proportion of 50% to 60%, and a mass proportion of 5% to 10%. Preparing the porous material contained below ,
In the step of firing the mixture, the fired product of the clay-based material, the fired product of the porous material, and the fired product of the glassy material so as to fill a gap between the bubbles,
A method for producing a fired body, wherein the glassy material is foamed and fired so as to form a film on an inner wall of a void of a fired product of the porous material .   The said preparation process WHEREIN: The said clay-type material which has the clay contained by 20 to 35% by mass ratio and the bentonite contained by 5 to 15% by mass is prepared. A method for producing a fired body.   The method for producing a fired body according to claim 4 or 5, wherein in the preparing step, one kind of porous material selected from the group consisting of scoria, zeolite, and Hyuga soil is prepared. The step of obtaining the mixture comprises
A step of obtaining a kneaded product by kneading the clay-based material, the glassy material, and the porous material;
A step of obtaining a cylindrical kneaded product by extruding the kneaded product into a cylindrical shape;
The plate-like kneaded product is cut in the longitudinal direction from one end to the other end of the cylindrical kneaded product and rolled to obtain a plate-like kneaded product. Production method.

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