Method for producing ceramic material composition precursor containing beverage extraction residue, method for producing ceramic material composition, and method for producing sintered body

Abstract

To provide a ceramic material composition precursor containing beverage extraction residue, which can improve the strength of a ceramic material composition and a sintered body, and a method for producing the ceramic material composition.SOLUTION: A method for producing a ceramic material composition precursor containing beverage extraction residue according to the present invention includes: adding water to a ceramic material and a beverage extraction residue and wet-grinding and kneading the same to obtain a ground kneaded product; and dehydrating the ground kneaded product to obtain a ceramic material composition precursor containing beverage extraction residue.SELECTED DRAWING: None

Description

[Technical Field]

[0001] Embodiments of the present invention relate to a method for producing a ceramic material composition precursor containing beverage extraction residue, a method for producing a ceramic material composition, and a method for producing a sintered body. [Background technology]

[0002] In recent years, demand for beverages such as green tea and barley tea has been growing year by year, and the amount of beverage extraction residue generated has also increased. Effective utilization of beverage extraction residue will reduce the burden on the global environment. Furthermore, effective utilization of beverage extraction residue in the ceramic material field will lead to the effective utilization of unused resources in resource-poor Japan.

[0003] On the other hand, in the field of ceramic sintered bodies, improving strength is an issue, and for example, Patent Document 1 discloses a method for manufacturing briquettes that are strong and resistant to powdering by blending starch into the raw material. Also, Patent Document 2 discloses a technology for adding starch to a decorative material and mixing it to uniformly adhere a melting agent to ceramic particles in order to stably produce decorative layers for ceramic building materials. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2022-112263 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-67503 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of one embodiment of the present invention is to provide a ceramic material composition precursor containing beverage extraction residue, which can improve the strength of a ceramic material composition and a sintered body, and a method for producing the ceramic material composition.An object of another embodiment of the present invention is to provide a method for producing a sintered body having high strength. [Means for solving the problem]

[0006] The present invention includes the following embodiments, but is not limited to the following embodiments. (1) A method for producing a beverage extract residue-blended ceramic material composition precursor, comprising: adding water to a ceramic material and beverage extract residue, wet-pulverizing and kneading the ceramic material and beverage extract residue to obtain a pulverized and kneaded product; and dehydrating the pulverized and kneaded product to obtain a beverage extract residue-blended ceramic material composition precursor. (2) A method for producing a ceramic material composition precursor containing beverage extraction residue according to (1), wherein the amount of beverage extraction residue used is 2.0 to 10.0 mass % (solid content mass) based on the total mass of the ceramic material and beverage extraction residue. (3) A method for producing a ceramic material composition precursor containing beverage extraction residue according to (1) or (2), wherein the beverage extraction residue is at least one selected from the group consisting of used tea leaves and used barley tea leaves. (4) A method for producing a ceramic material composition precursor containing beverage extraction residue according to any one of (1) to (3), wherein the beverage extraction residue is at least one selected from the group consisting of hydrated tea leaves and hydrated barley tea leaves. (5) A method for producing a ceramic material composition, comprising molding and drying a beverage extraction residue-blended ceramic material composition precursor obtained by the production method described in any one of (1) to (4) above, to obtain a ceramic material composition. (6) A method for producing a sintered body, comprising firing the ceramic material composition obtained by the production method described in (5) above to obtain a sintered body. [Effects of the Invention]

[0007] According to an embodiment of the present invention, a ceramic material composition precursor containing beverage extraction residue and a method for producing the ceramic material composition can be provided, which can improve the strength of the ceramic material composition and the sintered body. According to another embodiment of the present invention, a ceramic material composition having high strength and a method for producing the sintered body can be provided. DETAILED DESCRIPTION OF THE INVENTION

[0008] The following describes embodiments of the present invention, but the present invention is not limited to the following embodiments.

[0009] [Method for producing a ceramic material composition precursor containing beverage extraction residue] A method for producing a ceramic material composition precursor containing beverage extract residue, which is an embodiment of the present invention, includes wet-pulverizing and kneading a ceramic material and beverage extract residue with the addition of water to obtain a pulverized and kneaded product (sometimes referred to as the "pulverizing and kneading step"), and dehydrating the pulverized and kneaded product to obtain a ceramic material composition precursor containing beverage extract residue (sometimes referred to as the "dehydration step"). The method for producing a ceramic material composition precursor containing beverage extract residue may further include an optional step such as preparing or preparing the beverage extract residue.

[0010] (Crushing and kneading process) In the grinding and kneading process, the ceramic material and beverage extract residue are wet ground and kneaded with the addition of water to obtain a ground and kneaded product. Examples of grinding and kneading machines that can be used for wet grinding and kneading include mixers, ball mills, planetary ball mills, bead mills, and high-speed rotary grinding and kneading machines. Examples of beads used in grinding and kneading machines include alumina beads, zirconia beads, and steel beads. The ceramic material, beverage extract residue, and water can be added to the grinding and kneading machine simultaneously or in any order. When grinding and kneading the ceramic material and beverage extract residue in the wet, optional components such as colorants such as pigments and binders may also be added.

[0011] Examples of ceramic materials include pottery stone (Izumiyama pottery stone, Amakusa pottery stone, etc.), coarsely crushed pottery stone, pottery clay (Kibushi clay, Gaime clay, Murakami clay, etc.), clay minerals (kaolinite, smectite, montmorillonite, sericite, illite, glauconite, chlorite, talc, zeolite, feldspar, alumina, silica, etc.). The ceramic material may be a mixture of two or more selected from these. The ceramic material preferably contains at least one selected from the group consisting of pottery stone, coarsely crushed pottery stone, and pottery clay.

[0012] The ceramic material may be soil or ore with grass and tree roots removed, and the ceramic material may be granular. Soil or ore collected from mountains or veins may be used as the ceramic material, but large particle sizes may cause strain during the grinding and kneading process. Therefore, the particle size of the ceramic material may be, for example, 1 μm to 3 cm, 1 μm to 2 cm, or 1 μm to 1 cm. A particle size of 3 cm or less facilitates grinding and kneading, while a particle size of 1 μm or more facilitates the dewatering process after grinding and kneading. For example, during dewatering using a filter press, clogging of the filter cloth is less likely to occur.

[0013] Beverage extraction residue is the residue remaining after extracting beverage ingredients such as tea, barley, coffee, and dried fruit with water. For example, used tea leaves are the residue remaining after extracting tea components from raw tea with water. As used herein, "raw tea" includes tea plant tissues containing active ingredients that can be extracted as tea, specifically leaves and stems. The raw tea may be unfermented tea, semi-fermented tea, fermented tea, or a mixture thereof. Examples of unfermented tea include green tea, examples of semi-fermented tea include oolong tea, and examples of fermented tea include black tea. The raw tea is preferably green tea, and examples of green tea include steamed tea, sencha, gyokuro, bancha, tamaryokucha, kamairicha, and Chinese green tea. The raw tea may be a single type of raw tea or a mixed raw tea containing two or more types of raw tea. Barley tea leaves are the residue remaining after extracting barley tea ingredients from roasted barley. The barley may be an improved variety of barley, such as enzyme-processed barley, barley with a high beta-glucan content, amylose-free barley, or low-polyphenol barley. Examples of barley include two-row barley, four-row barley, six-row barley, and naked barley. Examples of six-row barley include Legacy, Shunrai, Fiber Snow, and Kashimamugi varieties. Examples of two-row barley include Hindmarsh, Metcalf, Scope, Commander, Houshun, Mikamo Golden, and Nishinohoshi varieties. The barley may be a single variety or a mixed barley containing two or more varieties of barley. The barley tea leaves may be either hydrated tea leaves or dried tea leaves.

[0014] The beverage extraction residue may be a hydrated product or a dried product. From the viewpoint of improving the strength of the sintered body, a hydrated product is preferable. It is presumed that the fibers are easier to extract after pulverization from a hydrated product than from a dried product, and that the strength is improved by the entanglement of the fibers with each other or with the soil. However, the present invention is not limited by these presumptions. A hydrated product is also preferable because the residue can be used without drying.

[0015] The water-containing residue obtained after extracting ingredients from raw materials can be used as is as the water-containing beverage extraction residue. Further water may be added to the water-containing residue after extraction to adjust the water content. Alternatively, the water-containing residue may be dried to obtain a dried product, and the dried product may be mixed with water to thoroughly blend the dried product and used as the water-containing beverage extraction residue.

[0016] The water-containing beverage extract residue contains solid matter and water. The water content of the water-containing beverage extract residue (water / water-containing beverage extract residue × 100 (mass%)) is preferably 50 to 98 mass%, more preferably 55 to 95 mass%, and even more preferably 55 to 90 mass%, based on the mass of the water-containing beverage extract residue.

[0017] The dried beverage extraction residue can be obtained by drying the water-containing residue obtained after extracting ingredients from raw materials. The moisture content of the dried beverage extraction residue (water / dried beverage extraction residue × 100 (mass%)) is preferably 20 mass% or less or 15 mass% or less, and may be 2 to 10 mass%, based on the mass of the dried product.

[0018] The beverage extraction residue may be used directly in the grinding and kneading step, or may be ground in advance to simplify the grinding and kneading. The particle size of the beverage extraction residue after grinding in advance is 1 μm to 12 mm, preferably 1 μm to 5 mm, and more preferably 1 μm to 3 mm. If the particle size is 12 mm or less, kneading with other materials can be carried out efficiently, and if the particle size is 1 μm or more, for example, the dehydration step after grinding and kneading can be easily carried out.

[0019] The particle size of the beverage extraction residue can be adjusted, for example, by wet-pulverizing the residue obtained after extraction, either as is or with the addition of water, or by drying the residue obtained after extraction and then dry-pulverizing it. A mixer, mill, refiner, pulper, mortar, or the like can be used for wet-pulverization. The particle size of the beverage extraction residue can be measured by a sieving method.

[0020] The beverage extraction residue may be used alone or in combination of two or more. The amount of beverage extraction residue used (solid content mass) is, for example, 1.0 to 15.0 mass% or 2.0 to 10.0 mass% based on the total mass of the ceramic material and beverage extraction residue. When the amount of beverage extraction residue used is 1.0 mass% or more, the effect of improving the strength of the sintered body tends to be easily obtained. When the amount of beverage extraction residue used is 15.0 mass% or less, it tends to be easy to achieve both weight reduction and improved strength.

[0021] The amount of water used is, for example, 40 to 95 mass %, preferably 45 to 90 mass %, and more preferably 50 to 80 mass %, based on the total mass of the materials (including water) used for pulverization and kneading.

[0022] The conditions for pulverization and kneading can be set appropriately depending on the equipment used. For example, it is preferable to perform the pulverization and kneading under conditions such that the particle size of the ceramic material after pulverization and kneading is 0.3 μm to 1 mm.

[0023] (Dehydration process) In the dehydration step, the pulverized and kneaded product is dehydrated to obtain a ceramic material composition precursor containing beverage extract residue. In this specification, "dehydrating the pulverized and kneaded product" refers to removing water from the pulverized and kneaded product to reduce the amount of water contained in the pulverized and kneaded product. A filter press or the like is used in the dehydration step. The water content of the ceramic material composition precursor containing beverage extract residue is preferably 15 to 35% by mass, more preferably 20 to 30% by mass.

[0024] [Method of manufacturing ceramic material composition] A method for producing a ceramic material composition according to an embodiment of the present invention includes forming the beverage extraction residue-blended ceramic material composition precursor, drying the precursor, and obtaining a ceramic material composition. The method for producing a ceramic material composition may include forming the beverage extraction residue-blended ceramic material composition precursor to obtain a molded body (sometimes referred to as a "forming step"), and drying the molded body to obtain a ceramic material composition (sometimes referred to as a "drying step").

[0025] (molding process) In the molding step, the beverage extract residue-blended ceramic material composition precursor is molded to obtain a molded body. The beverage extract residue-blended ceramic material composition precursor may be molded after adding water to adjust its moisture content. The molding step may be performed using a potter's wheel or by casting. Alternatively, the pulverized and kneaded product may be cast into a plaster mold or the like, and molding may be performed simultaneously with the preparation of the beverage extract residue-blended ceramic material composition precursor while dehydrating.

[0026] (drying process) In the drying step, the molded body is dried to obtain a ceramic material composition. For drying, for example, a heater, an infrared irradiator, a blower, a vacuum dryer, a constant temperature blower incubator, etc. can be used.

[0027] The drying conditions can be appropriately set depending on the apparatus used. For example, drying is preferably carried out under conditions such that the moisture content of the ceramic material composition immediately after drying is 10 mass % or less based on the mass of the ceramic material composition.

[0028] [Method of manufacturing sintered body] The method for producing a sintered body according to an embodiment of the present invention includes firing the ceramic material composition to obtain a sintered body (sometimes referred to as a "firing step"). The method for producing a sintered body may further include an optional step of forming a glaze layer on the surface of the sintered body.

[0029] (Firing process) In the firing step, the ceramic material composition is fired to obtain a sintered body. For firing, a known firing furnace such as an electric furnace or a combustion furnace can be used. The firing temperature is, for example, 800 to 1,500°C, 900 to 1,400°C, or 950 to 1,350°C. The firing time is, for example, 2 to 36 hours, 3 to 30 hours, or 4 to 24 hours.

[0030] The sintered body obtained by the manufacturing method of the embodiment of the present invention realizes effective utilization of beverage residue and has increased strength. According to some embodiments, the sintered body has an increased weight reduction rate. The sintered body is preferably used for various applications, such as interior and exterior materials, wall materials, flooring materials, building materials, panels, tiles, boards, and household ceramics. [Example]

[0031] The embodiments of the present invention will be described below with reference to examples, but the embodiments of the present invention are not limited to the following examples.

[0032] <Method for preparing hydrated used tea leaves and hydrated used barley tea leaves> (Method for preparing hydrated tea leaves) 150g of first-grade tea from Shizuoka Prefecture in 2021 was added to 15L of water at 90°C and extracted for 5 minutes. After extraction, the tea leaves were collected to obtain hydrated tea leaves. During the extraction, the tea was stirred for 20 seconds immediately after adding the first-grade tea, and then again 2 and 4 minutes later. (Method for preparing hydrated barley tea leaves) 60g of barley tea taken from 54 tea bags of "Kaori Kaoru Mugicha" (Fragrant Barley Tea) manufactured by Ito En Co., Ltd. was added to 3L of water at 80°C and extracted for 10 minutes. After extraction, the barley tea leaves were collected to obtain hydrated barley tea leaves.

[0033] <Method for preparing dried used tea leaves and dried barley tea leaves> (Method for preparing dried tea leaves) The hydrated tea leaves obtained above were treated and dried at 70°C for 12 hours using a constant temperature air blower (Yamato Scientific Co., Ltd. "DNK812") to obtain dried tea leaves. (Method for preparing dried barley tea leaves) The hydrated barley tea leaves obtained above were treated and dried at 70°C for 12 hours using a constant temperature air blower (Yamato Scientific Co., Ltd. "DNK812") to obtain dried barley tea leaves.

[0034] <Method for crushing used tea leaves and barley tea leaves> (Grounding of wet tea leaves) 150 g of water was added to 40.6 g of the obtained hydrated tea leaves (moisture content 81.03% by mass), and the mixture was wet-pulverized at room temperature for 1 minute at low speed using a mixer (T-fal "Blendforce glass") The pulverized material was sieved through a 1 mm mesh sieve, and the oversized and undersized fractions were collected. The solid mass ratio of the oversized and undersized fractions was 1.1:1.0. (Dried ground tea leaves) The dried tea leaves (moisture content 3.07% by mass) obtained above were dry-pulverized using a mixer (T-fal "Blendforce glass") at room temperature at low speed for 1 minute. The pulverized material was sieved through a 1 mm mesh sieve, and the oversized and undersized material were collected. The solid mass ratio of the oversized and undersized material was 1.0:13.9.

[0035] (Grounding of hydrated barley tea leaves) 170 g of water was added to 129.3 g of the obtained hydrated barley tea husks (moisture content 76.00% by mass), and the mixture was wet-pulverized at room temperature for 1 minute at low speed using a mixer (T-fal "Blendforce glass") The pulverized material was sieved through a 1 mm mesh sieve, and the oversized and undersized fractions were collected. The solid mass ratio of the oversized and undersized fractions was 1.00:2.75. (Dried ground barley tea leaves) The dried barley tea husks (moisture content 0.93% by mass) obtained above were dry-pulverized using a mixer (T-fal "Blendforce glass") at room temperature at low speed for 1 minute. The pulverized material was sieved through a 1 mm mesh sieve, and the oversized and undersized material were collected. The solid mass ratio of the oversized and undersized material was 1.0:16.0.

[0036] <Preparation of ceramic material composition precursor containing beverage extraction residue, ceramic material composition, and sintered body 1> [Example 1] (Preparation of ceramic material composition precursor containing beverage extraction residue) Ceramic material (water content 25% by mass, average particle size 11 μm, "Tokusuki Clay" manufactured by Takesho Seiko Co., Ltd.), the dried tea leaves obtained above, and water were added to a mixer ("Blendforce Glass" manufactured by T-fal) in a mass ratio of 19 parts ceramic material:1 part dried tea leaves (solid content by mass):30 parts water. The mixture was wet-pulverized and kneaded at low speed for 1 minute at room temperature. The mixture was then dehydrated at 105°C for 12 hours using a constant-temperature blower ("DNK812" manufactured by Yamato Scientific Co., Ltd.) to obtain a ceramic material composition precursor containing beverage extract residue. "1 part dried tea leaves (solid content by mass)" indicates that the dried tea leaves were added in a mass ratio that resulted in a "mass ratio of 1 to the solid content." The amount of tea leaves used (solid content) was 5.0% by mass (1 / (19 + 1) × 100).

[0037] (Preparation of ceramic material composition) Water was added to the beverage extraction residue-blended ceramic material composition precursor to a moisture content of 30% by mass, mixed, and left to stand at room temperature for 12 hours, after which it was molded into tablets with a diameter of 2.5 cm and a thickness of 5 mm in a cylindrical plastic container to obtain a molded body. The molded body was then treated and dried at 105°C for 12 hours in a constant temperature oven to obtain a ceramic material composition.

[0038] (Production of sintered ceramics) The ceramic material composition was fired by heating at 1,000°C for 5 hours in an electric furnace (TOYO SEISAKUSHO "OPM-240") to obtain a sintered body (pottery).

[0039] [Examples 2, 4, and 5] A ceramic material composition precursor containing beverage extraction residue, a ceramic material composition, and a sintered body were obtained in the same manner as in Example 1, except for using the used tea leaves or used barley tea leaves shown in Table 1. The used tea leaves or used barley tea leaves were added in an amount that gave a mass ratio of 19 parts ceramic material, 1 part solids mass of used tea leaves, and 30 parts water.

[0040] [Example 3] A ceramic material composition precursor containing beverage extraction residue, a ceramic material composition, and a sintered body were obtained in the same manner as in Example 1, except that the used tea leaves shown in Table 1 were used and a ball mill ("RECIPRO SHAKER SR-1" manufactured by Taiyo Kagaku Kogyo Co., Ltd.) was used for wet grinding and kneading. The used tea leaves or barley tea leaves were added in an amount that gave a mass ratio of 19 parts ceramic material, 1 part solids mass of used tea leaves, and 30 parts water.

[0041] [Comparative Example 1] Ceramic material (water content 25% by mass, average particle size 11 μm, "Tokusuki Clay" manufactured by Takesho Seiko Co., Ltd.), the dried tea leaves obtained above, and water were added to a mortar (manufactured by Taxin) in a mass ratio of 19 parts ceramic material:1 part dried tea leaves (solid content mass):30 parts water, and mixed to obtain a mixture. The mixture was treated at 105°C for 12 hours using a constant temperature incubator (Yamato Scientific Co., Ltd. "DNK812") to dehydrate, obtaining a beverage extraction residue-blown ceramic material composition precursor. Next, in the same manner as in Example 1, a ceramic material composition and a sintered body were obtained.

[0042] [Comparative Examples 2 to 4] A ceramic material composition precursor containing beverage extraction residue, a ceramic material composition, and a sintered body were obtained in the same manner as in Comparative Example 1, except for using the used tea leaves or used barley tea leaves shown in Table 1. The used tea leaves or used barley tea leaves were added in an amount that gave a mass ratio of 19 parts ceramic material, 1 part solids mass of used tea leaves, and 30 parts water.

[0043] Comparative Example 5 Ceramic material (water content 25% by mass, average particle size 11 μm, "Tokusuki Clay" manufactured by Takesho Seiko Co., Ltd.) and water were added to a mixer ("Blendforce Glass" manufactured by T-fal) in a mass ratio of 19 parts ceramic material to 30 parts water, kneaded, and treated at 105°C for 12 hours using an air-blowing constant-temperature incubator ("DNK812" manufactured by Yamato Scientific Co., Ltd.) to dehydrate, yielding a precursor. Water was added to the precursor to achieve a water content of 30% by mass, mixed, and allowed to stand at room temperature for 12 hours. The mixture was then molded into tablets measuring 2.5 cm in diameter and 5 mm thick in a cylindrical plastic container, yielding a green body. The green body was then treated at 105°C for 12 hours using an air-blowing constant-temperature incubator, dried, and yielded a ceramic material composition. The ceramic material composition was fired by heating at 1,000°C for 5 hours using an electric furnace (TOYO SEISAKUSHO "OPM-240") to obtain a sintered body.

[0044] <Evaluation of ceramic material compositions and sintered bodies (pottery)> The strength of the ceramic material composition and sintered body (pottery) was measured using a compressive / tensile strength measuring device (IMADA Co., Ltd. "DPX-100TR, MV100AC"). The measurement was conducted at room temperature until the sample was penetrated or fractured. The values ​​calculated by (strength (kg)) / (mass (g) of the sample) are shown in Table 1.

[0045] [Table 1]

[0046] As shown in Table 1, the manufacturing method of the example can improve the strength of the sintered body. As shown in Table 1, the use of hydrated used tea leaves or hydrated used barley tea leaves can further improve the strength of the sintered body.

[0047] <Preparation of ceramic material composition precursor, ceramic material composition, and sintered body (pottery) 2> [Example 6] (Preparation of Ceramic Material Composition Precursor) Ceramic material (water content 25% by mass, average particle size 11 μm, "Tokusuki Clay" manufactured by Takesho Seiko Co., Ltd.) was crushed and sieved in the same manner as above. The dried tea leaves (particle size 1 mm or less) recovered from the undersieve were then added to a mixer ("Blendforce Glass" manufactured by T-fal) in a mass ratio of 49 parts ceramic material, 1 part dried tea leaves (solid content by mass), and 75 parts water. The mixture was wet-pulverized and kneaded to obtain a crushed and kneaded product. The wet-pulverization and kneading were performed at room temperature at low speed for 1 minute. The crushed and kneaded product was dehydrated and treated at 105°C for 12 hours using a constant-temperature oven ("DNK812" manufactured by Yamato Scientific Co., Ltd.) to obtain a ceramic material composition precursor. The amount of used tea leaves (solid content) was 2.0% by mass (1 / (49 + 1) × 100). (Ceramic material composition and preparation of sintered bodies (pottery)) Next, in the same manner as in Example 1, a ceramic material composition and a sintered body (pottery) were obtained.

[0048] [Examples 7 to 19] A ceramic material composition precursor, a ceramic material composition, and a sintered body were obtained in the same manner as in Example 6, except that the used tea leaves or barley tea leaves shown in Table 2 were used and the amounts of used tea leaves or barley tea leaves shown in Table 2 were used. When the amount of used tea leaves or barley tea leaves used was 5.0 mass%, the mixture was made in a mass ratio of 19 parts ceramic material:1 part (solid content by mass) of used tea leaves or barley tea leaves:30 parts water; when the amount of used tea leaves used was 8.0 mass%, the mixture was made in a mass ratio of 11.5 parts ceramic material:1 part (solid content by mass) of used tea leaves:18.75 parts water; and when the amount of used tea leaves or barley tea leaves used was 10.0 mass%, the mixture was made in a mass ratio of 9 parts ceramic material:1 part (solid content by mass) of used tea leaves or barley tea leaves:15 parts water.

[0049] <Evaluation of ceramic material compositions and sintered bodies (pottery)> The strength of the ceramic material composition and the sintered body (pottery) was measured in the same manner as in Example 1. The weight reduction rate of the pottery was calculated from the mass of the ceramic material composition and the mass of the sintered body using the formula: Weight reduction rate (mass %) = ((mass of ceramic material composition - mass of sintered body) / mass of ceramic material composition) x 100. The results are shown in Table 2.

[0050] [Table 2]

[0051] As shown in Table 2, the strength of the sintered body can be further improved by using hydrated used tea leaves or hydrated used barley tea leaves with a particle size of 1 mm or less. Also, as shown in Table 2, the weight reduction rate of the sintered body can be further improved by using dried used tea leaves or dried used barley tea leaves.

Claims

1. A method for producing a beverage extraction residue-blended ceramic material composition precursor, comprising: adding water to a ceramic material and beverage extraction residue, wet-pulverizing and kneading the ceramic material and beverage extraction residue to obtain a pulverized and kneaded product; and dehydrating the pulverized and kneaded product to obtain a beverage extraction residue-blended ceramic material composition precursor.

2. A method for producing a ceramic material composition, comprising molding and drying a beverage extraction residue-blended ceramic material composition precursor obtained by the method of claim 1 to obtain a ceramic material composition.

3. 2. The method for producing a ceramic material composition precursor containing beverage extraction residue according to claim 1, wherein the amount of beverage extraction residue used is 2.0 to 10.0 mass% (solid content mass) based on the total mass of the ceramic material and the beverage extraction residue.

4. 2. A method for producing a ceramic material composition precursor containing beverage extraction residue according to claim 1, wherein the beverage extraction residue is at least one selected from the group consisting of used tea leaves and barley tea leaves.

5. 2. A method for producing a ceramic material composition precursor containing beverage extraction residue according to claim 1, wherein the beverage extraction residue is at least one selected from the group consisting of hydrated tea leaves and hydrated barley tea leaves.

6. A method for producing a sintered body, comprising firing the ceramic material composition obtained by the method according to claim 2 to obtain a sintered body.

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