JPH0569575B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a method for producing ceramic granules that can efficiently produce ceramic granules of a constant particle size that are used as raw materials for air diffusers, water-permeable pavement boards, etc. It is related to.

(Prior art) As a method for producing ceramic grains, there is
As shown in Japanese Patent No. 51362, a method is known in which a ceramic raw material is extruded into a linear shape using a clay kneading machine, granulated using a wet granulator, and then fired and dried.

However, in this conventional method for producing ceramic granules, the length of the linear bodies extruded from the clay kneading machine is not uniform, so when they are granulated using a wet granulator, they are randomly disintegrated. This method has disadvantages in that the particle size varies greatly, and a large amount of fine powder is generated, resulting in a low yield of particles with the desired particle size.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional problems, reduces waste of ceramic raw materials in the granulation process, and produces spherical or cylindrical ceramic grains with uniform particle size. This invention was completed in order to provide a method for producing spherical or cylindrical ceramic grains that can be produced with high yield.

(Means for solving the problem) The above problem was solved by using ceramic clay with a moisture content adjusted to 15 ± 1% as a raw material, feeding it into a pelleter equipped with a rotating roller on the top of the screen, and rotating it through the holes in the screen. A roller extrudes the ceramic clay into a ceramic short cylinder of a certain length, and the ceramic short cylinder is shaped into a spherical or cylindrical shape by a sizing machine in which a ceramic liner with fine protrusions is pasted on the surface of a rotary disk. Shaped and dried,
This problem can be solved by a method for producing ceramic grains which is characterized by firing.

The present invention will be explained in detail below by following the steps of the illustrated embodiment.

(Example) As shown in Fig. 1, first, clay raw material is crushed with a trommel, enough water is added and stirred thoroughly in a tank to make a slurry, and this slurry is squeezed with a filter press. Moisture content is 25%
Create a cake of about. This is dried in a drying chamber until the water content is 3% or less, and then roughly crushed using a coarse crusher to obtain a dried ceramic raw material.

Next, 1 to 5 parts by weight of an inorganic pigment and approximately 18 parts by weight of water are added to 100 parts by weight of such dry ceramic raw material, and the mixture is kneaded in a kneader until the water content is 15±1.
Obtain ceramic clay 1 adjusted to 1%. If the moisture content of the ceramic clay 1 is too high or too low, the loss of the ceramic clay in the following steps will increase, which is not preferable.

Next, the ceramic clay 1 is put into a pelleter 2, and its rotating rollers 4 extrude the ceramic clay as a short ceramic columnar body 3 of a certain length. The pelleter 2 used in the present invention is
Preferably, a pair of rotating rollers 4, 4 are provided on the upper surface of the screen 6, which has through-holes with a constant diameter within the range of about 0.6 to 10.0 mm, and these rotating rollers 4, 4 rotate around a horizontal axis. By rotating and revolving around the central vertical axis 5, the ceramic clay 1 is pushed out through the holes in the screen 6 to form a short ceramic columnar body 3 of a constant length. In this pelleter 2, by controlling the moisture content and thickness of the ceramic clay 1 supplied between the screen 6 and the rotating roller 4, the length of the ceramic short cylindrical bodies 3 can be made almost constant. The diameter and length of the ceramic short cylindrical body 3 are set to values close to the intended particle size.

Next, this short ceramic columnar body 3 is molded into a spherical shape using a sizing machine 7 as shown in FIG. This granulator 7 has a wear-resistant ceramic liner 10 with a large number of minute protrusions 9 closely attached to the surface of a metal rotary disk 8 that rotates on the bottom of a cylindrical case 11. This ceramic liner 10 prevents wear, and at the same time, the minute protrusions 9 of the ceramic liner 10 apply an appropriate frictional force to the ceramic short cylindrical body 3, and the ceramic short cylindrical body 3 The particles are forcibly rotated on the surface of the ceramic particles 10 to form spherical or cylindrical ceramic particles 11 having a constant particle size approximately equal to the diameter of the short ceramic columnar body 3. In addition, the inner surface of the sieving machine is heated with a heater to improve the sieving effect.

The ceramic grains 11 formed in this way are then dried in a drying furnace such as a tunnel furnace or a fluidized drying furnace until the moisture content becomes 3% or less, and then stored in a sagger 12 and fired. Furthermore, each ceramic grain is loosened to form the final product.

In this way, in the present invention, ceramic clay 1
The moisture content of the pellets was adjusted to an appropriate value, and a specially constructed pelleter 2 equipped with a rotating roller 4 on the top surface of a screen 6 was used to extrude the pellets as short ceramic columns 3 of a certain length. Unlike the conventional method, the sizes of the ceramic clay 1 supplied to the grading machine 7 can be precisely aligned. Therefore, according to the present invention, there is no waste of the ceramic clay 1, and spherical or cylindrical ceramic grains 11 of uniform particle size can be produced at a high yield.

Furthermore, in the present invention, since the grain size regulating machine 7 is used, in which a wear-resistant ceramic liner 10, preferably made of alumina or the like, is attached to the surface of the rotary disk 8, the rotary disk 8 is prevented from being worn. At the same time, the short ceramic cylindrical bodies 3 are sufficiently rotated on the surface of the ceramic liner 10 by the frictional force caused by the minute protrusions 9 of the ceramic liner 10, and efficiently become spherical or cylindrical ceramic particles 11 of a constant particle size. .

Furthermore, ceramic grains 1 produced in this way
1 has a uniform particle size, so it is suitable as a material for air diffuser plates that require uniform foaming.It is also strong and durable, and can be beautifully colored, so it is suitable as a material for road paving plates. It is also suitable as

(Effects of the Invention) As is clear from the explanation of the above embodiments, the present invention combines the moisture adjustment of ceramic clay and the structure of the pelleter and grading machine to reduce the amount of water generated in the ceramic granulation process. It is possible to reduce waste of ceramic clay and produce spherical or cylindrical ceramic grains with uniform particle size at a high yield.

Therefore, the present invention can greatly contribute to the development of industry as a method for manufacturing ceramic grains that solves the conventional problems.

[Brief explanation of the drawing]

FIG. 1 is a process diagram illustrating the steps of an embodiment of the present invention, FIG. 2 is a block diagram thereof, and FIG. 3 is a cross-sectional view showing the structure of a sizing machine used in the present invention. 1: Ceramic clay, 2: Pelletizer, 3: Ceramic short cylindrical body, 4: Rotating roller, 6: Screen, 7: Sizing machine, 8: Rotating disk, 9: Protrusion, 1
0: Ceramic liner.

Claims (1)

[Claims] 1. Ceramic clay 1 whose water content has been adjusted to 15±1% is put into a pelleter 2 equipped with a rotating roller 4 on the top surface of a screen 6 using the ceramic clay 1 as a raw material, and is made into ceramic clay by the rotating roller 4 through the holes in the screen 6. is extruded as a ceramic short cylindrical body 3 of a certain length, and this ceramic short cylindrical body 3 is made into a spherical or cylindrical shape by a sizing machine 7 in which a ceramic liner 10 having minute protrusions 9 is attached to the surface of a rotary disk 8. A method for producing ceramic grains, which comprises shaping, drying, and firing.