JP2596479B2 - Method for manufacturing kneaded clay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a raw material (clay) used for ceramics such as tiles.

[0002]

2. Description of the Related Art Generally, when producing clay as a tile raw material, raw ore powder roughly crushed by a crusher is finely crushed by a ball mill and mixed with a clay suspension. And the slurry after being blended is granulated with a spray dryer or made into a cake with a filter press,
This is granulated by a desin granulator to form a clay. Thus, in the method for producing kneaded clay using a spray drier, the shape of the granulated secondary particles becomes nearly spherical, and although the fluidity is improved, the secondary particles are finely pulverized by a ball mill that forms the secondary particles. In addition, since the shape of the primary particles is also close to a spherical shape, there is a disadvantage that the surface area is small and the reactivity of the powder during firing is poor. In addition, in the case of using a filter press and a decyne granulator, the shape of the granulated secondary particles is irregular with severe irregularities, so that the fluidity of filling the clay into the press mold becomes poor. As a result, there is a disadvantage that the packing density of the raw material particles becomes non-uniform. The non-uniform filling density results in non-uniform thermal expansion and contraction during firing, which causes tile warpage and dimensional variations.

[0003] For this reason, the present applicant has filed Japanese Patent Application No. 63-83.
No. 385 has already filed an application for a method for producing kneaded clay having excellent fluidity and reactivity during firing. The technique previously filed by the present applicant is as shown in FIG. 3, and is characterized by dry pulverization of raw materials and mixing and stirring with a mixer to granulate. That is, first, 70 wt% of a rough stone roughly crushed by a crusher is mixed with 30 wt% of a kibushi clay having an original water content of about 25%, and this is mixed with a dry pulverizer (for example, Mineral Minin).
g Finely pulverized with an air impact mill (Technology GmbH) 1 to obtain a finely pulverized raw material (primary particles) having a water content of about 2%. And this moisture content is 2
% Of primary particles of about 90% by weight, and 10% by weight of a frog-eye clay originally having a water content of about 45% is added, and the two are mixed and stirred by a mixer 2 to simultaneously perform granulation. Thereby, secondary particles having a water content of about 14% are obtained. After that, the secondary particles are dried to adjust the water content to obtain a clay having a water content of about 7%.
In the method for manufacturing clay, which was previously filed by the present applicant, since the raw Ishinobi Kibushi clay is dry-pulverized, the shape of each finely-pulverized primary particle has an uneven surface and a spherical shape as a whole. . Therefore, there is an advantage that the clay has excellent fluidity and also has excellent reactivity during firing.

[0004]

In the case of producing clay of this kind as a ceramic material, it is essential to mix clay at a predetermined ratio. As the clay material, the above-mentioned Kibushi clay and Frogme clay are generally used. Recently, the production amount of Kibushi clay has dropped sharply, making it difficult to obtain and expensive. In contrast, Frog-eyed clay has the highest yield and can be obtained very easily and at low cost. Therefore, in the case of producing a ceramic material such as kneaded clay, it is more advantageous to increase the use ratio of the Frogme clay as much as possible.

[0005] However, in the case of Kibushi clay, its original moisture content is about 25%, and it can be finely pulverized together with the rough stone by the dry pulverizer 1. Has a disadvantage that the moisture content is too high for dry pulverization. In other words, in the case of Frogme clay, dry pulverization is impossible, so that it can be added only at the time of mixing and stirring in the mixer 2, and even in this case, if a large amount of Frogme clay is used, There was a drawback that the slurry became a watery slurry and could not be granulated. In addition, if you use a large amount of Frog eye clay with Mixer 2,
The mixing and stirring of the slurry particles of Frogme clay and the primary particles pulverized by dry milling became non-uniform, and there was a drawback that when a tile was formed, a tile pattern was formed. In other words, in the method for producing kneaded clay granulated by the mixing / stirring method previously applied by the present applicant, the yield is low and it is inevitable to use a large amount of hard-to-obtain and expensive Kibushi clay. There were drawbacks.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the method for producing kneaded clay previously developed by the present applicant, and has been improved and removed. It is an object of the present invention to provide a method for producing kneaded clay that can be reduced to a minimum.

[0007] The first means adopted by the present invention to solve the above-mentioned problems is to pulverize raw ore and Kibushi clay with a dry pulverizer to produce primary particles, Moisture clay alone or a mixture of a part of the raw material obtained by finely pulverizing the frog eye clay and the ore is preliminarily adjusted for water by a spray drier, and the raw material having the water content adjusted and the finely ground primary powder are mixed by a mixer. -A method for producing a kneaded clay, characterized by stirring and granulating, and drying the primary particles after granulation to a predetermined moisture content. In the second means of the present invention, the water content of the Frogme clay is adjusted in advance by a spray drier, and this is finely pulverized together with the ore with a dry pulverizer to produce primary particles, and water is added to the primary particles. Mixing and stirring with a mixer to granulate to produce secondary particles, and drying the secondary particles to a predetermined moisture content to produce a soil.

[0008]

According to the first means of the present invention, the water content of Frog-eye clay, which originally has a water content of 40 to 45%, is adjusted to 3 to 6% by using a spray dryer. for that reason,
When the dry finely pulverized primary particles and Frogme clay are mixed and agitated with a mixer to granulate, even if the usage of Frogme clay is greatly increased, the whole will become a slurry with much water. And granulation processing is possible. Therefore, it is possible to drastically reduce the amount of Kibushi clay that is put into a dry pulverizer together with the ore and pulverized. Further, in the second means of the present invention, the frog eye clay and the ore whose moisture is adjusted in advance by a spray drier are finely pulverized with a dry pulverizer, water is added to the obtained primary particles, and the mixture is stirred and mixed with a mixer. Granulated to produce secondary particles. Therefore, the second means can completely eliminate the kibushi clay conventionally used.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below with reference to the drawings based on the embodiments shown in the drawings. The same reference numerals as those in the conventional case denote the same members.

FIG. 1 is a block diagram showing a kneaded material manufacturing process according to the first means of the present invention. As shown in this figure, in this embodiment, 90% of raw stones such as feldspar, pottery stone, and wax stone are used.
-100 wt% and Kibushi clay are prepared in an amount of 0-10 wt%, the two are mixed, and the mixture is finely pulverized by the dry pulverizer 1. The primary particles of the finely pulverized product thus obtained have a water content of 1 to 1.5%. On the other hand, in another step, the Frogme clay having a water content of 40 to 45% alone or a mixture of the Frogme clay and the primary particles or the finely-crushed ore is supplied to the spray drier 3 and the water content is lowered. 3
Adjust the water content to be ~ 6%. Then, 70% by weight of the primary particles obtained by the dry pulverizer 1 and 30% by weight of the water-adjusted Frogme clay obtained by the spray dryer 3 or a mixture of the primary particles and 30% by weight are mixed by the mixer 2. Stir and granulate at the same time. The water content of the secondary particles obtained by granulation is 14%. After that, the secondary particles are dried to adjust the water content, and a clay for tile molding having a water content of about 7% is obtained. Thus, in the first means, only 0 to 10 wt% of the kibushi clay is required for the raw stone in the dry pulverizer 1. This makes it possible to greatly reduce the amount of use as compared with the conventional production method requiring as much as 30% by weight of the raw stone.

FIG. 2 is a block diagram of a method for producing kneaded clay according to the second means of the present invention. As shown in the figure, in this second means, the water content of Frogme clay, which originally has a water content of 40 to 45 wt%, is adjusted by a spray dryer 3 so that the water content becomes 3 to 6%. doing. Then, the dry-type fine pulverizer 1 combines the water-adjusted 30-40% by weight of the frog-eye clay with the raw material 60-70% by weight of the ceramic material.
To produce primary particles. The water content of the primary particles is 1 to 1.5%. Thereafter, water is added to the primary particles, mixed and stirred by the mixer 2, and granulated at the same time to form secondary particles. The water content of the secondary particles is 14
%. The water content of the secondary particles is adjusted through a drying process, and the secondary particles become a clay having a water content of about 7%. Therefore, in the case of this second means, it is possible not to use Kibushi clay at all.

Incidentally, the present invention is not limited to the above-described embodiment, but can be appropriately modified. For example, in the second means, the case where the moisture adjustment by the spray drier 3 is performed using the Frogme clay alone is described. However, a mixture of the Frogme clay and the raw material obtained by finely grinding the rough stone may be used. Good.

[0013]

As described above, in the present invention,
The water content of the frog eye clay alone or the mixture of the frog eye clay and the raw material obtained by finely pulverizing the ore is adjusted with a spray dryer in advance,
This is dry-milled together with the raw stone, or mixed and stirred with the raw material obtained by milling the raw stone with a mixer, and granulated at the same time. Therefore, it is possible to use a large amount of Frog-eye clay, and it is possible to significantly reduce the use of expensive and expensive Kibushi clay which is low in production and difficult to obtain. It is possible.

[Brief description of the drawings]

FIG. 1 is a block diagram of a manufacturing process showing a first means of the present invention.

FIG. 2 is a block diagram of a manufacturing process showing a second means of the present invention.

FIG. 3 is a block diagram showing a conventional manufacturing process.

[Explanation of symbols]

 1. Dry pulverizer 2. Mixer 3. Spray dryer

Claims (2)

(57) [Claims] 1. A method for producing primary particles by finely pulverizing an ore and a Kibushi clay with a dry pulverizer, and mixing a part of the raw material obtained by pulverizing the frog-clay alone or the frog-clay with the ore. The water content is adjusted in advance by a spray dryer, the raw material whose water content has been adjusted and the finely pulverized primary particles are mixed and agitated with a mixer to granulate, and the granulated secondary particles are dried to a predetermined value. A method for producing kneaded clay characterized by having a water content. 2. The water content of the frog eye clay is adjusted in advance by a spray drier, and this is finely pulverized together with the ore with a dry pulverizer to produce primary particles. Water is added to the primary particles and mixed with a mixer. A method for producing kneaded clay, wherein secondary particles are manufactured by stirring and granulating, and the secondary particles are dried to a predetermined moisture content.