JPH10273358A - Production of pottery product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a means capable of accelerating the deflecculation of raw materials for a pottery product on the formation of the slurry of the raw materials and also capable of easily adjusting the foaming degree of a foamed pottery product on its production. SOLUTION: 100 pts. of raw materials for a pottery product, 30-70 pts.wt. of water and 1-10 pts.wt. of glass powder are charged into a ball mill and subsequently finery polished. The finery polishing process accelerates the elution of an alkali from the glass fine particles to exhibit the deflocculation of the slurry. When a foamed pottery product is produced, the amount of the added glass power can be changed to control the foaming degree of the foamed pottery product. When the glass powder is added during the finery grinding process or at a time near to the finish of the process, the glass powder contains glass fine particles having particle diameters of <=20 μm in an amount of >=40%. The colorability of a pigment is improved due to the alkali eluted from the glass powder. Waste glass powder of industrial waste can be utilized as the glass powder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to tiles, washbasins,
The present invention relates to a method for adjusting raw materials for producing toilet bowls, tanks, and other ceramic products by adding glass powder. There are two purposes for adding the glass powder. One is to adjust the peptized state of the raw material, and the other is to adjust the foaming rate in the case of producing an expandable product.

[0002]

2. Description of the Related Art To manufacture ceramic products, feldspar, quartz,
A series of steps of mixing various raw materials such as pottery stones and clays in a predetermined ratio is polished with a ball mill or the like to obtain slurry, which is then dehydrated or dried, then molded and fired. It is common.

[0003] In the above-mentioned process, when the fine polishing step is wet pulverization, various raw materials prepared in a predetermined ratio and an appropriate amount of water are charged into a ball mill or the like and finely polished for several hours.
Adjust the slurry. At this time, a deflocculant is usually added in order to stabilize the suspension state of each raw material particle, prevent aggregation of the particles, and reduce the viscosity of the slurry. In some cases, the slurry obtained by the fine polishing step is once dehydrated by a filter press or the like, and then suspended again to obtain a clay slurry. In this case, a deflocculant is usually added.

[0004] Sodium salts such as sodium phosphate, sodium polyphosphate, sodium hydroxide, sodium aluminate and sodium silicate (water glass) are well known as deflocculants conventionally used. Lithium salts such as lithium oxide and lithium carbonate, and organic peptizers such as amine compounds are also used.

[0005] In the case of producing foaming ceramic products such as foam tiles, silicon carbide (Si
Although a blowing agent such as C) is added, a deflocculant is usually added also in order to suppress the secondary aggregation of the blowing agent and make the dispersion state uniform. Evenly dispersing the foaming agent greatly affects the quality of the product, and if secondary agglomeration (segregation) of the foaming agent occurs, the foaming rate fluctuates, resulting in dimensional defects and shape defects of the product.

[0006]

The above-mentioned conventional peptizer has the following problems. First of all, the conventional peptizers are generally expensive and thus contribute to high costs.

Second, the conventional peptizer has a problem that it is very difficult to control the amount of addition. The optimal amount of deflocculant depends on the type of raw material and too little or too much does not show deflocculation. Insufficiency in the amount of addition causes poor peptization, and addition of an excessive amount of peptizer in excess of an appropriate amount causes secondary agglomeration, so that the amount added must be strictly controlled. By way of example, the optimal use of sodium polyphosphate, a very effective deflocculant, is in a very small range of only 0.1 to 0.5 parts by weight per 100 parts by weight of the raw material. The slurry viscosity deviates from the appropriate value, at least
Poor peptization or secondary aggregation may be caused.

On the other hand, the production of foamable ceramic products has the following conventional problems. In the case of producing an expandable ceramic product, a foaming agent of about 0.05 to 2% is added, but the foaming rate varies due to a variation in the raw material composition and the fine particle size.
Therefore, it is necessary to adjust the foaming rate. However, since the amount of the foaming agent to be added is very small, control thereof is required to be sophisticated and very difficult. It is also possible to adjust the foaming rate by changing the fire resistance by increasing or decreasing the ratio of the feldspar / clay component in the raw material, but in this case, there is a disadvantage that the strength of the green body is affected.

[0009] In addition, foamable ceramic products have the property of being inferior in color development to ordinary products because they expand when fired. Increasing the amount of pigment added to improve color development
It is not preferable because it leads to high cost. It is known that increasing the content of feldspar increases the color developability, but this causes a new problem that the strength of the green body is reduced.

[0010] Further, since the foamable ceramic product has a structure having pores inside, it has relatively low strength. By increasing the amount of the feldspar component, it is possible to densify the base and improve the product strength, but in this case, the raw base strength is reduced as described above. It is conceivable that the addition of a melting accelerator may densify the substrate, but usually, the melting accelerator not only inhibits the color development of the pigment, but may cause a defective product shape due to a decrease in melt viscosity. Use is less preferred.

[0011]

According to the present invention, it has been found that when a predetermined amount of glass powder is added to a raw material for ceramic products, the glass powder acts not only as a deflocculant but also as an effect of adjusting the foaming rate. It is an object of the present invention to provide a novel method for manufacturing a ceramic product based on knowledge, which can solve the conventional problems. A feature of the method for manufacturing a ceramic product employed in the present invention is that glass particles having a particle size of 20 μm or less
% Of glass powder is added to raw materials for ceramic products. In this case, 1 to 10 parts by weight of a glass powder containing 40% or more of glass fine particles having a particle size of 20 μm or less can be added to 100 parts by weight of the ceramic product raw material. It can contain 40% or more of glass fine particles having a diameter of 10 μm or less.

Another feature of the method adopted in the present invention is that, in the fine polishing step of raw materials for ceramic products, 1 to 1 part by weight of glass powder is added to 100 parts by weight of raw materials for ceramic products.
0 parts by weight.

In the above method of the present invention, the glass powder comprises:
It is desirable to contain 3% or more of Na ₂ O. Further, the glass powder may be industrial waste glass composed of waste glass powder or the like.

The present invention can be applied to a method for producing a foamable ceramic product in which a foaming agent is added to the raw material for a ceramic product.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The process of applying the present invention includes a fine polishing process in which a raw material for ceramic products is pulverized by a ball mill or the like to form a slurry, and a previously prepared slurry is once dewatered into a raw material clay. A process requiring uniform dispersion of the raw material for ceramic products, such as a process of re-suspending the raw material clay and re-adjusting the clay slurry, is an object.

[First Embodiment] First, the present invention relates to the case of producing a normal ceramic product which is not foamable,
A case in which the raw material for ceramic products is applied to a process of wet fine polishing with a ball mill will be described. In the present embodiment, the purpose of adding the glass powder is to peptize raw materials for ceramic products.

Raw materials mixed in a predetermined ratio into a ball mill,
A predetermined amount of glass powder is added together with an appropriate amount of water, and finely polished to adjust the slurry. When adding glass powder,
Instead of starting from the beginning of the fine polishing step, the raw material and water may be charged into a ball mill and finely polished for a predetermined period of time. In this case, after the addition of the glass powder, the fine polishing operation for a short time is continued.

If the glass powder is blended from the beginning of the polishing step and is wet-polished for a sufficient time together with the raw material and water, a powder having a particle size of about 4 mm under can be used. . In the case of adding in the middle of the fine polishing step, or in the case where the adjusted raw material clay is re-suspended to re-adjust the kneaded slurry, glass having a particle size of 20 μm or less (preferably 10 μm or less) is used as glass powder. A material containing 40% or more (preferably 60% or more) of fine particles is used.
Glass fine particles having a particle size of 20 μm or less are alkali (mainly K + ions and Na + ions) into the slurry during the polishing process.
It exerts a deflocculating action to release lipase. When the ratio of the glass particles having a size of 20 μm or less in the glass powder is less than 40%, there is a possibility that sufficient peptizing ability may not be obtained.

The mixing ratio of the glass powder is in the range of 1 to 10 parts by weight based on 100 parts by weight of the raw material for ceramic products. If the blending amount of the glass powder is less than 1 part by weight, not only the necessary peptizing effect may not be obtained, but also the management of the blending amount becomes difficult because the amount is too small. Conversely, if the amount of the glass powder exceeds 10 parts by weight, the viscosity of the slurry may increase due to the secondary agglomeration. In addition, the deformation temperature decreases due to the increase in the glass component ratio, and the shape retention during firing is reduced. It may cause loss of shape of the product due to loss.

The types of glass to be added are soda glass,
Suitable are those containing a large amount of Na ₂ O components, such as soda-lime glass, and more preferably those containing 3% or more, preferably 6% or more of Na ₂ O. As the glass powder as described above, waste glass powder generated when polishing the end face of a glass product or the like, or a crushed glass bottle or window glass can be used. It has the advantage that it can be utilized. When the content of glass fine particles having a particle size of 20 μm or less in the waste glass powder to be used is less than 40%, the particle size is adjusted or glass fine particles having a particle size of 20 μm or less produced industrially are added. It can also be used.

As described above, by mixing a glass powder together with a raw material for a ceramic product into a ball mill and finely polishing the raw material, or by pulverizing the raw material and then adding the glass powder and further finely polishing the raw material, Particle size is 20μ
The alkali (mainly K + ion and Na + ion) elutes from the glass particles having a particle size of m or less to exert a deflocculating action, thereby reducing the viscosity of the slurry and increasing the fluidity. Therefore, the water content of the slurry can be reduced by suppressing the amount of water added at the time of polishing the raw material, so that the time and energy required for the subsequent dehydration step and drying step can be saved. Also, if casting is performed using this slurry, it is possible to increase the particle filling rate because of its excellent fluidity, and it is possible to obtain a base having excellent shape retention because of its low water content. ing.

The glass powder to be added to the raw materials for ceramic products is
In addition to the action as a peptizer, it has the following secondary actions. One of them is an effect of accelerating the coloring of the pigment. Conventionally, when adding a pigment to the slurry to color the product base, if the mixing ratio of the feldspar component in the raw material is increased,
It is known that the color development of pigments is improved by the release of alkali from feldspar. However, if the composition ratio of feldspar is increased,
It is also known that a disadvantage that the green body strength is reduced occurs. According to the present invention, by the addition of glass powder,
Since the alkali concentration of the slurry can be increased and the coloring of the pigment can be promoted without increasing the proportion of the feldspar component, there is no possibility that the strength of the green body is reduced. Further, since the amount of expensive pigment used can be saved by improving the coloring properties of the pigment, the advantage that the cost can be reduced can be obtained.

Another effect exerted by the blending of the glass powder in the present invention is that the fire resistance of the green body can be reduced and the use ratio of the clay can be increased, thereby increasing the green base strength. is there. It is generally known that the green base strength can be increased by increasing the use ratio of clay. However, an increase in the mixing ratio of clay has the disadvantage of increasing the fire resistance of the product base. When the fire resistance increases, a high firing temperature and a long firing time are required, and as a result, the time and energy required for the firing are increased. In order to reduce the fire resistance, dolomite and lime are conventionally blended in the raw material, but these have a disadvantage that they hinder the coloring of the pigment. As mentioned above, the glass powder does not inhibit the color development of the pigment, but rather promotes the color development of the pigment. Therefore, even if the proportion of clay is increased, the firing temperature can be set low and the firing time can be shortened due to the decrease in the fire resistance based on the addition of the glass powder, so that the firing efficiency is improved and the firing cost is reduced. It is. Furthermore, since the firing temperature can be set low, the width of temperature change during firing becomes small, and defects such as cracks are less likely to occur.

[Second Embodiment] Next, an embodiment in which the present invention is applied to the production of an expandable ceramic product will be described. In this case, the addition of the glass powder is intended to control the foaming rate of the product together with the peptization of the raw material for the product and the foaming agent. In the case of producing foaming ceramic products, the foaming agent is added to 0.1%.
About 0.5 to 2% by weight of the raw material for ceramic products
Glass powder is added within the range of 10 to 10% by weight. By increasing or decreasing the amount of glass powder, the foaming rate can be adjusted without changing the amount of the foaming agent. The process to which the present invention is applied is the same as in the first embodiment, such as a fine polishing process for raw materials for ceramic products, a process for re-suspending the already prepared raw material clay and re-adjusting the clay, and the like. Become.

When the glass powder is blended from the beginning of the step of wet-polishing the raw material for the foaming ceramic product with a ball mill, the particle diameter of the glass powder may be about 4 mm under. To a ball mill, a predetermined amount of glass powder is added together with a raw material, a foaming agent, and an appropriate amount of water prepared in a predetermined ratio, and the slurry is adjusted by fine polishing. A uniform dispersion state of the blowing agent is obtained. In addition, the degree of fire resistance of the product base is changed by the alkali, and as a result, the foaming ratio is also changed. Therefore, it is possible to adjust the foaming rate of the product by adding the glass powder.

It is to be noted that the glass powder is not added from the beginning of the refining process, but is added after the material is polished for a certain period of time and the raw material is slurried to a certain extent. When the glass powder is not subjected to a long-term fine polishing treatment, such as when it is suspended and added when adjusting the clay, the particle size of the glass powder is 2
It is necessary to use glass particles containing 40% or more (preferably 60% or more) of glass particles of 0 μm or less (preferably 10 μm or less). Glass fine particles having a particle diameter of 20 μm or less can release alkali (mainly K + ions and Na + ions) into the mud by a short polishing step or mixing and stirring alone. However, when the ratio of the glass fine particles having a size of 20 μm or less in the glass powder is less than 40%, there is a possibility that sufficient alkali is not released. It is the same as in the first embodiment that the mixing ratio of the glass powder is set in the range of 1 to 10 parts by weight with respect to 100 parts by weight of the ceramic product raw material including the foaming agent.

By adding the glass powder, the alkali (mainly K + ion · N
a + ions) exert a deflocculating action to lower the viscosity of the slurry and improve the dispersion of the foaming agent. That is, since a uniform foaming state is obtained, the shape stability of the product is increased. Alkali also has the effect of reducing the fire resistance of the product base and increasing the foaming rate. That is, since the foaming ratio can be adjusted without changing the mixing ratio of feldspar or clay, the green body strength is not affected. Moreover, the water absorption rate is reduced and the base material is densified, so that the strength of the product is improved.

[0028]

【Example】

Embodiment 1 FIG. 1 shows an example of a process for producing a ceramic product (non-foamable) according to the present invention. In a ball mill, 100 parts of a raw material for ceramic products consisting of apritic feldspar, Saba feldspar and clays (the total of aprite feldspar and Saba feldspar is 80 parts or less, and the remainder is clays), water 30.
７０70 parts, 1-10 parts of glass powder containing 40% or more of glass fine particles having a particle size of 20 μm or less as a deflocculant, and other necessary additives (eg, pigments) are added. I do. By this fine polishing step, alkali is eluted from the glass powder to exert a deflocculating action, and a good and stable dispersion state of the slurry is brought about. The glass powder may be added before the fine polishing step is started or near the end of the fine polishing step.

When a ceramic product is manufactured from the slurry obtained in the fine polishing step by a wet molding method, as shown in FIG. 1A, the slurry is dewatered with a filter press to adjust the water content. Then, a product base is formed by an extruder, which is dried and fired to obtain a target product. In the case of manufacturing a product using a dry molding method, as shown in FIG. 1 (B), after the slurry is dried by a spray drier, it is compression-molded by a press molding machine, and dried if necessary. By firing, the desired ceramic product is obtained.

[Embodiment 2] FIG. 2 shows an example of a process for producing an expandable ceramic product such as a foam tile according to the present invention. As shown in FIG. 1A, a ball mill is used to prepare a ceramic product comprising 100 parts of feldspar and clay, 0.05 to 2 parts of a foaming agent such as SiC, 30 to 70 parts of water, and a particle size of 4 mm.
1 to 10 parts of under glass powder and other necessary additives (such as pigments) are added, and a fine polishing step is performed for 4 to 60 hours. In the polishing step, the alkali eluted from the glass powder exerts a deflocculating action to bring about a good dispersion state of the raw material and the foaming agent, and appropriately adjust the foaming rate of the product. After the obtained slurry is dried by a spray dryer, it is compression-molded by a press molding machine, dried if necessary, and baked to obtain a target foamable ceramic product.

In the case where the glass powder is added near or after the end of the fine polishing step as shown in FIG.
After adding 1 to 10 parts of glass powder containing 40% or more of glass fine particles having a particle size of 20 μm or less,
Brief grinding or stirring and mixing. Thereafter, this is dried with a spray drier, compression-molded with a press molding machine, dried if necessary, and baked to obtain a target foamable ceramic product.

[Test 1] In Test 1, in the first embodiment of the present invention, the relationship between the mixing ratio of the glass powder to the raw material for ceramic products (non-foamable) and the viscosity of the slurry was examined. In the test method, 50 parts of water was added to 65 parts of apritic feldspar and 35 parts of clay, and the mixture was slurried for 6 hours with a ball mill to form a slurry. A predetermined amount of glass powder is added to this slurry, and the viscosity is further measured after fine grinding for 0.5 hour with a ball mill. The glass powder to be added has an average particle size of 8.
3. The content of glass particles having a particle size of 10 μm or less is 60%.
It is.

The viscosity was measured using a laser diffraction particle size distribution analyzer (LA-5000, Horiba, Ltd.). The measurement results are shown in the graph of FIG.

As a comparative example, the viscosity of the slurry when a conventional peptizer, sodium silicate or sodium polyphosphate, was added and finely polished was also examined. The measurement results are shown in the graph of FIG.

As is clear from the graph of FIG. 3, the viscosity of the slurry can be reduced by adding the glass powder to the raw material for ceramic products based on the method of the present invention. It turns out that is possible. As is clear from the comparison between FIG. 3 and FIG.
The amount of the glass powder required for the same degree of viscosity adjustment is about 10 times that of conventional deflocculants such as sodium silicate and sodium polyphosphate. In other words, it can be seen that the amount of the glass powder is much easier to control than the conventional peptizer.

[Test 2] In test 2, in the first embodiment, the difference in coloring properties depending on the presence or absence of glass powder was examined. The test method is a kneaded clay produced by adding a chromite pigment and a conventional deflocculant to raw materials for ceramic products (this is called a
To measure and compare the strength of color development of kneaded clay (referred to as kneaded clay) manufactured by blending a chromite pigment and glass powder as a deflocculant in raw materials for ceramic products (referred to as kneaded clay). Performed by

The method for producing the kneaded clay is as follows.
The raw material for ceramic products consisting of 5 parts and 35 parts of clay,
And 0.5 parts of sodium polyphosphate as a deflocculant and a predetermined amount of chromite pigment were added, and a fine grinding process was performed for 6 hours with a ball mill. The obtained slurry was dried at 120 ° C., and then water 6% And granulate it with a net desin granulator (net opening = 2.5 mm).

The kneaded clay (b) is prepared by mixing 3 parts of glass powder in place of sodium polyphosphate as a deflocculant with a raw material for a ceramic product, performing a fine polishing process by a ball mill according to the same procedure as that of the a kneaded clay, and drying. , Manufactured through granulation.

The color intensity was measured using a color difference meter (# 90 manufactured by Nippon Denshoku Co., Ltd.) to measure the L value. As for the L value, the smaller the numerical value, the higher the coloring intensity. The test results are shown in the graph of FIG.

In the kneaded clay in which the glass powder is blended based on the method of the present invention, the coloring of the chromite pigment is intensified, and the blending amount of the pigment necessary to obtain the same L value can be reduced. For example, the addition amount of the pigment required to obtain L = 36 was about 3.1 parts in the comparative example, but only 2.7 parts according to the present invention, and about 13% is saved.

[Test 3] In test 3, in the second embodiment of the present invention, the relationship between the mixing ratio of glass powder to the raw material for the foaming ceramics product and the bulk specific gravity and bending strength of the product was examined. is there. The bulk specific gravity is determined by the foaming rate, and the bending strength is determined by the degree of densification of the substrate.

The test method was as follows: water, 0.06 part of SiC as a foaming agent, and a predetermined amount of glass powder having a particle size of 4 mm under were added to 100 parts of a raw material for ceramic products consisting of 70 parts of feldspar and 30 parts of clay. Is finely polished with a ball mill to form a slurry. After the slurry was dried, it was granulated with a sinter (30 mesh), and the obtained granulated product was formed.
To produce a fired body. Then, the bulk specific gravity and the bending strength of the fired body were measured, and the relationship with the added amount of the glass powder was examined. The measurement results are shown in the graph of FIG. The unit of the bending strength is MPa.

As a comparative example, without adding glass powder,
The bulk specific gravity and flexural strength of the fired body produced by changing the amount of SiC as a foaming agent were also examined. The measurement results are shown in the graph of FIG.

From the graph of FIG. 6, based on the method of the present invention,
It can be seen that by adding glass powder to the raw material for the foaming ceramics product, the foaming rate can be adjusted without changing the amount of the foaming agent. At this time, the compounding amount of the glass powder required for adjusting the bulk specific gravity to the same degree is the amount of the blowing agent S
It is about 20 times or more of iC. That is, the bulk specific gravity is 0.1
For the adjustment, the amount is increased or decreased by 0.01 part in the case of SiC, and about 2 parts in the case of glass powder. As described above, the amount of the glass powder is much easier to control than the case where the foaming rate is adjusted by controlling the amount of the foaming agent added.

Further, when products having similar bulk specific gravities are compared with each other, the product to which glass powder is added has a higher bending strength. This means that the addition of the glass powder promotes the densification of the substrate.

[Test 4] In test 4, in the second embodiment, the difference in coloring properties depending on the presence or absence of glass powder was examined. The test method is as follows: a clay prepared by adding a foaming agent and a chromite pigment without adding a deflocculant or a glass powder to a raw material for a ceramic product; In addition, together with a foaming agent and a chromite pigment, a kneaded clay (referred to as d kneaded clay) to which glass powder is added is prepared, and a fired body is manufactured using c kneaded clay and d kneaded clay. Measure and compare.

C The method for adjusting the kneaded clay is as follows: 100 parts of a raw material for ceramic products, comprising 70 parts of feldspar and 30 parts of clay,
Water, 0.08 part of a foaming agent (SiC), and a predetermined amount of chromite pigment are charged, and the mixture is finely ground to form a slurry. After drying the slurry, the mixture is granulated with a sinterer (30 mesh). The method for producing the kneaded clay is the same as described above. In a ball mill, 100 parts of a raw material for ceramic products consisting of 70 parts of feldspar and 30 parts of clay are mixed with 0.06 part of water, a foaming agent (SiC), and 4 parts of glass powder. And, a predetermined amount of chromite pigment is charged, and this is finely ground to form a slurry, and after drying the slurry, it is granulated with a sinter (30 mesh). The thus-prepared c-clay and d-clay are formed and fired to produce an expandable ceramic product, and the color development intensities are measured and compared. In addition, in order to eliminate the influence of the difference in the foaming rate on the coloring property, the bulk specific gravity of the manufactured fired body was adjusted to be almost 1.5. The color strength was measured by measuring the L value using a color difference meter (# 90 manufactured by Nippon Denshoku Co., Ltd.). The test results are shown in the graph of FIG.

The expandable ceramic product produced by blending glass powder according to the method of the present invention has a strong coloration of the chromite pigment, and the blending amount of the pigment necessary to obtain the same L value is small. I'm done. For example, the addition amount of the pigment required to obtain L = about 37 was about 3.0 parts in the comparative example, but may be 2.0 parts according to the present invention. Save 33%.

[0049]

According to the method of the present invention, an excellent peptizing effect is exhibited by a simple means of blending a predetermined glass powder with a raw material for ceramic products to reduce the viscosity of the slurry. Therefore, the water content of the slurry can be reduced,
The time and energy required for the subsequent dehydration step and drying step can be saved.

The compounding amount of the glass powder can be about 10 times that of the conventional peptizer. Since it is not a very small amount, the allowable range of the error is increased, and it is not necessary to control the compounding amount strictly.
Therefore, the process management becomes easy, and the workability is improved.

When producing an expandable ceramic product, it is possible to control the expansion ratio without changing the amount of the blowing agent by adjusting the amount of the glass powder. In addition, in controlling the foaming rate, the amount of the glass powder is adjusted about 20 times as compared with the case of increasing or decreasing the addition amount of the foaming agent, so that the control of the blending amount is very easy. Further, the addition of the glass powder has an effect of densifying the base of the foaming ceramic product, so that the strength of the product is improved.

Since glass powder releases alkali into the slurry, the color development of the pigment is improved. Therefore, the amount of expensive pigment used can be reduced. Also, there is no need to increase the proportion of feldspar, so it does not affect the green base strength. This effect is particularly useful when producing a foaming ceramic product having poor coloring properties.

Since the degree of fire resistance can be reduced by blending glass powder, it is possible to reduce and increase the proportion of clay having the property of increasing the degree of fire resistance. Therefore, it is easy to secure the green body strength. In addition, since the firing temperature can be set low and the firing time can be shortened by reducing the fire resistance, the time and energy required for firing can be saved.

Waste glass powder can be used as the glass powder to be mixed with the raw material for ceramic products, so that industrial waste can be effectively used.

[Brief description of the drawings]

FIG. 1 relates to a first embodiment of the present invention,
It is a flowchart which shows an example of the process of manufacturing a ceramic product.

FIG. 2 relates to a second embodiment of the present invention,
It is a flowchart which shows an example of the process of manufacturing an effervescent ceramic product.

FIG. 3 relates to Test 1, and is a graph showing the relationship between the amount of glass powder and the viscosity of the slurry when the glass powder is mixed with the slurry according to the method of the present invention.

FIG. 4 relates to Test 1, and is a graph showing the relationship between the amount of glass powder and the viscosity of the slurry when a conventional peptizer is added to the slurry.

FIG. 5 is a graph relating to Test 2 and comparing the coloring intensity of pigments with and without glass powder.

FIG. 6 relates to Test 3, and is a graph showing the relationship between the amount of glass powder contained in an expandable ceramic product manufactured according to the method of the present invention, and the bulk specific gravity and bending strength of the product.

FIG. 7 relates to Test 3, and is a graph showing the relationship between the amount of a foaming agent added to a foaming ceramic product as a comparative example, and the bulk specific gravity and bending strength of the product.

FIG. 8 relates to Test 4, and is a graph comparing the coloring strength of pigments with and without glass powder in foaming ceramic products.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kiyoshi Nakamura 5-1-1 Koiehoncho, Tokoname-shi, Aichi Prefecture Inax Corporation

Claims (7)

[Claims] 1. A method in which glass fine particles having a particle size of 20 μm or less
A method for manufacturing a ceramic product, wherein a glass powder containing 0% or more is added to a raw material for a ceramic product. 2. A method for producing a ceramic product, comprising adding 1 to 10 parts by weight of a glass powder containing 40% or more of glass fine particles having a particle size of 20 μm or less to 100 parts by weight of a raw material for a ceramic product. Method. 3. The method for producing a ceramic product according to claim 1, wherein the glass powder contains 40% or more of glass fine particles having a particle size of 10 μm or less. 4. In a fine polishing step of a raw material for a ceramic product, 1 to 1 part by weight of a glass powder is added to 100 parts by weight of a raw material for a ceramic product.
A method for producing a ceramic product, characterized by adding 0 parts by weight. 5. The method for producing a ceramic product according to claim 1, wherein the glass powder contains 3% or more of Na ₂ O. 6. The method for producing a ceramic product according to claim 1, wherein the glass powder is industrial waste glass made of waste glass powder or the like. 7. The method for producing a ceramic product according to claim 1, wherein a foaming agent is added to the raw material for a ceramic product.