JP2731687B2 - Method of kneading ceramic raw materials - 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 continuously kneading ceramic raw materials using a mixer of a diffusion mixing type.

[0002]

2. Description of the Related Art For example, in the case of producing a water-permeable pavement plate using sewage sludge molten slag, ceramic balls or the like as an aggregate, a molding aid, a firing aid and water are added to granular aggregates. A method of kneading and press-molding the obtained aggregate kneaded material is used. In this case, if kneading is performed using a mixer of a diffusion mixing type, uniform kneading can be performed in a relatively short time.

[0003] A typical mixer of this diffusion mixing type is such that an elastic rubber ball 2 is attached to the bottom of a metal container 1 as shown in FIG. The structure is such that the contents are mixed while diffusing contents in random directions by vibrating vigorously by the rocking plate 3 tilted, and is known by the name of Omnimixer (registered trademark).

FIG. 2 shows a conventional process time schedule for kneading ceramics raw materials using sewage sludge molten slag, ceramic balls and the like as aggregates by using the above-mentioned diffusion mixing type mixer. As shown in the figure, first, an aggregate and a powdery molding aid are put into a diffusion-mixing type mixer, kneaded at, for example, 220 to 250 rpm for 30 seconds, and then a firing aid consisting of glaze and water is put in. After kneading at 220 to 250 rpm for 30 seconds, the kneaded material was discharged.

However, a part of the diffusion boundary surface 4 of the kneaded material gradually adheres to the side wall of the metal container 1 of the mixer, which is a non-sliding portion, and dries, and this falls into the next and subsequent kneaded materials. The quality of the kneaded material may be reduced. For this reason, conventionally, it has been necessary to perform washing with water every time the kneaded material is discharged, which has required a troublesome operation and also requires extra water for washing.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and can reduce the number of operations and the amount of water by eliminating the necessity of washing with water every time. The present invention has been completed in order to provide a method for kneading ceramic raw materials in which there is no danger that the attached matter on the side wall of the above will fall and deteriorate the quality of the kneaded material.

[0007]

Means for Solving the Problems The method for kneading ceramic raw materials according to the present invention, which has been made to solve the above-mentioned problems, is based on a method of continuously kneading ceramic raw materials using a diffusion mixing type mixer.
After discharging the kneaded material, only the aggregate is put into a mixer and high-speed rotational kneading is performed, and thereafter, a molding aid and a firing auxiliary are added and medium-speed rotational kneading is performed.

[0008]

As described above, in the present invention, after the kneaded material is discharged, only the aggregate is put into the mixer, and kneading is performed at a higher rotation speed than a normal kneading rotation speed. This causes the aggregate to diffuse violently inside the mixer, the interface reaching the top of the side wall of the container 1. Thereby, the kneaded material adhering to the side wall of the container at the time of the previous kneading is physically scraped off. Therefore, if the kneading is performed at a moderate speed such that the diffusion boundary 4 does not reach the side wall of the container 1 by adding a molding aid, a baking aid, water, and the like thereafter,
The same ceramic raw materials as before can be obtained. For this reason, according to the present invention, it is not necessary to wash with water as in the prior art, and it is possible to reduce the number of operations and the amount of water used. It is possible to prevent the quality of the kneaded material from being deteriorated due to the inclusion of the adhering material.

[0009]

Examples of the present invention will be described below. FIG. 3 shows a process time schedule for kneading ceramic raw materials using slag as an aggregate according to the method of the present invention, which is an improvement on the conventional process shown in FIG. In this embodiment, first, only granules of sewage sludge molten slag are charged into a diffusion mixing type mixer having a capacity of 30 liters, from which the kneaded material has been discharged, and a speed of 250 to 400 rpm, preferably 300 to 300 rpm, which is higher than the conventional rotation speed.
Kneading is performed at ~ 350 rpm (idle kneading with aggregate). As a result, the slag, which is the aggregate, diffuses violently inside the mixer, and deposits on the wall of the mixer are removed. After performing such high-speed rotational kneading for 1 to 5 minutes, preferably for about 3 minutes, a molding aid is added and 100 to 200 rpm lower than the conventional kneading rotational speed.
kneading for about 30 seconds at a medium speed of preferably 150 to 170 rpm, and further adding a sintering aid (glaze powder and water or glaze liquid) and kneading for about 30 seconds at a normal kneading speed. And the obtained ceramic raw material is discharged from the mixer. In this example, a mixer having a volume of 30 liters is used,
There is no change in the number of rotations due to the increase or decrease in the volume, and the scale can be easily increased.

FIG. 4 is a graph showing the amount of adhesion to the side wall of the container between the case where water washing is not performed by the conventional method and the method according to the present invention.
As described above, it can be seen that the adhered matter grows for each batch in the conventional method, whereas the method of the present invention does not grow the adhered matter by performing the aggregate spinning and kneading.

FIG. 5 is a graph showing the relationship between the number of rotations of the kneader, the rotation time, and the amount of adhesion during idle kneading of the slag aggregate according to the present invention. From this figure, the appropriate condition is 300 to 350 rpm
× 3 minutes.

[0012]

As described above, according to the method for kneading ceramic raw materials of the present invention, after the kneaded material is discharged, only the aggregate is put into the mixer to perform high-speed kneading. The kimono will be scraped off by violently scattered aggregates, eliminating the need for water washing as in the prior art.
For this reason, it is possible to eliminate the trouble of cleaning with water and to reduce the amount of cleaning water. Therefore, the present invention greatly contributes to the industry as a particularly advantageous method for kneading ceramic raw materials when a large amount of ceramic raw materials are continuously kneaded.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a diffusion mixing type mixer.

FIG. 2 is a process time schedule diagram showing a conventional kneading method.

FIG. 3 is a process time schedule diagram showing a kneading method according to an embodiment of the present invention.

FIG. 4 is a graph showing the difference in the amount of adhesion between the conventional method and the method of the present invention.

FIG. 5 is a graph showing the relationship between the number of rotations and rotation time of the aggregate turning and kneading, and the amount of adhesion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container 2 Rubber ball 3 Rocking board 4 Diffusion boundary surface

Claims (1)

(57) [Claims] 1. In continuously kneading ceramic raw materials by a diffusion-mixing type mixer, after the kneaded material is discharged, only the aggregate is put into the mixer and high-speed rotational kneading is performed. A method for kneading raw materials for ceramics, characterized by adding medium and rotating and kneading at medium speed.