JPH082418B2 - Granulation method for inorganic granular raw material for ceramic industry - Google Patents

Description

TECHNICAL FIELD The present invention relates to an improvement in a granulation method for obtaining a granular raw material for ceramic products such as tiles.

More specifically, it is widely known that when manufacturing ceramic products such as tiles, the inorganic granular raw material is fired after molding.

Therefore, since the raw material is required to have a high bulk density and a low shrinkage rate, the present invention relates to a method for granulating a raw material satisfying this condition.

[Conventional method]

In order to obtain a granular raw material for a ceramic product of this kind, the method that the inventor has empirically known is a granulation method for obtaining a granular raw material for a ceramic product by a spray dryer.

It is known that this conventional method is adopted as a raw material for tiles because it has advantages such as a uniform structure in the particles.

[Problems to be Solved by the Invention]

However, the granulation method using a spray dryer has a low bulk density because the particles are not compressed during granulation.

Therefore, when a tile or the like is compression-molded as a raw material, the raw material easily adheres to the mold. Therefore, there is a problem that it is necessary to repeatedly remove the deposited material.

Further, since the bulk density is low and the firing shrinkage is high, there is a problem that a ceramic product in a regular form cannot be obtained when compression-molding and firing.

Furthermore, although a proper amount of water is required for compression molding, it has been difficult to give arbitrary moisture to the raw material during compression molding.

This invention is intended to solve the above problems, and an object thereof is to obtain an inorganic granular raw material for ceramics having a high bulk density, and at the time of a pre-process for obtaining a raw material having an appropriate particle size. In order to facilitate the compression molding in, the purpose is to freely set the water content of the raw material.

[Means for solving the problem]

In order to achieve the above object, the present invention is a slurry-like inorganic clay for ceramics containing water is heated to be substantially completely dried by adhering to the surface of a rotating drum, which is substantially completely dried. Peel the inorganic clay for ceramics from the drum, knead and humidify the inorganic clay for ceramics, and then compress the wet inorganic clay for ceramics, and further crush the compressed inorganic mineral clay for ceramics. A method for granulating an inorganic granular raw material for ceramics, which comprises obtaining an inorganic kneaded clay for ceramics having an appropriate size and shape, and then making this into a granular material having an appropriate size.

〔Example〕

 The details of the present invention will be described with reference to the accompanying drawings.

Drum dryers have conventionally been known to have a small mechanism, and are used to dry liquid, paste, and mud dyes, pigments, and the like.

Therefore, in the present invention, an improved relatively large-sized drum dryer 10 is provided to feed the ceramic inorganic clay 12 previously processed into a slurry containing a relatively large amount of water of about 30 to 40%. A pair of drums 16 via pipes 14
It is supplied to the supply tank 18 arranged above the space.

Then, the pair of drums 16 are slowly rotated outward from each other.

Although it depends on the size and shape of the drum 16, about 1 to 4 times per minute is generally suitable.

Although it has been described that the drum 16 is rotated outward, it is not intended to limit the rotation of the drum 16 outward.

However, according to an experiment by the inventor, the drum 16 is inwardly moved.
It was found that when the slurry was rotated, the drying treatment amount was not efficient when the slurry-like inorganic clay for ceramics was dried.

Therefore, it is preferable to rotate the drum 16 toward the outside, especially when the dry processing amount is taken into consideration.

Supply tank 18 for the above-mentioned slurry-like inorganic clay for ceramics 12
To be supplied between the pair of drums 16.

Thus, although the ceramic inorganic clay 12 has water, the ceramic inorganic clay 12 adhered to the surface of the drum 16 by the heated rotating drum 16 is gradually dried and becomes a thin film state.

At this time, the drum 16 is slowly rotated and heated by steam or the like to dry the inorganic clay for ceramics attached to the surface of the drum 16.

Thus, the film-like inorganic clay for ceramics has a water content of 0.
It is dried to about 33 to 0.60%.

Therefore, the film-shaped inorganic clay for ceramics adhering to the drum 16 is scraped off from the surface of the drum 16 by the knife 20 and dropped into the storage box 22 arranged below the drum 16.

The scraped-out dried inorganic clay for ceramics 24 naturally has many variations in shape and size, and contains almost no water as described above.

Therefore, in this state as it is, compression molding cannot be carried out in the next step. Therefore, in order to facilitate compression molding, the dried ceramic inorganic clay 24 is put into the kneading machine 26, and an appropriate amount of water, for example, 5 to 11% is supplied. .

Since this dried inorganic clay for ceramics is simply dried in a physically irregular form, in the conventional spray dryer granulation method, the granulated product is molded as a hollow body, resulting in the subsequent step. Although there is a drawback that it is difficult to adjust the supply of water, the present invention has an advantage that the water can be freely supplied because it is dried by the drum dryer 10 as described above.

In this way, the dried inorganic clay for ceramics 24 changes into a wet state in which it is easy to perform compression molding while containing water.

Therefore, from the kneading machine 26, the inorganic clay for ceramics 28 in a wet state
Is taken out, housed in a fixed mold 30, and compression-molded to obtain a compression-molded inorganic clay 32 for ceramics.

In this case, the purpose of compression-molding the inorganic clay for ceramics 28 is nothing but to obtain a material having a high density and a low shrinkage rate when used as an inorganic granular raw material for ceramics for ceramic products such as tiles.

Naturally, the compression-molded inorganic clay 32 for ceramics cannot be used as it is as a raw material for ceramic products such as tiles, so it is necessary to make it fine to a particle size of about 60 to 10 mesh.

Therefore, the above-described compression molded inorganic clay 32 for ceramics is used.
Is first crushed by a crusher 34 such as a net decine machine.

However, the crushed inorganic clay for ceramics in this state is
Since the particle size is still uneven, it is sieved through a sieving machine 36 to obtain a particle size of about 60 to 10 mesh.

Thus, an inorganic granular raw material for ceramic products such as tiles having a high bulk density and a low shrinkage rate due to a particle size of about 60 to 10 mesh can be obtained.

〔The invention's effect〕

The present invention has the following advantages because of the above configuration.

Since the process of almost completely drying the inorganic clay for ceramics prior to the granulation process is adopted, the required moisture set according to the application can be supplied accurately and simply, so the moisture corresponding to the application can be used. A content of inorganic granular raw material is obtained.

Therefore, it is possible to easily obtain an inorganic granular raw material for ceramics having a high bulk density and a low shrinkage ratio, which has not been experienced in the past.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 6 are schematic views of a granulating process of inorganic granular raw materials for ceramics, FIG. 1 is a sectional view of a drum dryer, and FIG. 2 is a schematic side view of a kneader. Fig. 3 is a schematic sectional view of a molding die, Fig. 4 is a schematic sectional view of a compression-molded inorganic clay for ceramics, and Fig. 5 is a state in which the inorganic clay for ceramics is put into a crusher. And FIG. 6 is a schematic side view of the sieving machine. (Explanation of symbols of main parts) 10 …… Drum dryer 12 …… Slurry ceramic inorganic clay 24 …… Dried ceramic inorganic clay 32 …… Compression-molded ceramic inorganic clay

Claims (1)

[Claims] 1. A ceramic inorganic clay in the form of a slurry containing water is heated to adhere to the surface of a rotating drum to be substantially completely dried, and a substantially completely dried inorganic inorganic clay for ceramics is used as a drum. Peel it off, and subject the inorganic clay for ceramics to kneading and humidification, then compress the inorganic clay for ceramics in the wet state, and crush the compressed inorganic inorganic clay for ceramics to obtain an appropriate size and shape. A method for granulating an inorganic granular raw material for ceramics, which comprises obtaining an inorganic kneaded clay for ceramics, and then making the granular material into an appropriate size.