SU50003A1 - The method of manufacturing semi-finished ceramic products - Google Patents

Description

As is known, red building bricks, roofing tiles, ceramic pipes, floor and facing tiles, chamotte, fass and other products are molded by semi-dry plastic and dry methods.

The method of plastic molding is the most common, as it requires less complex equipment, but the semi-finished products formed by this method, due to the significant amount of water contained in them, the amount of which depends on the quality of the raw material and is caused by the molding method itself, require long time to dry.

With the above experiments, the author found that if the bricks were quickly molded out of clay, shuttered on the boil, so that they would not have time to cool down, and immediately put them in an oven with a temperature of 120 ° LLP, they would dry very quickly without any defects ( cracks, warping, etc.).

Based on these experiments, the proposed method of making ceramic semi-finished products is that, for example, clay is mined from a quarry, if it is coarsely lumpy, crushed on suitable machines and, with its natural moisture, is sent to a drying drum or

a different drying unit, in which it is meant not mainly drying the clay, but steaming it in order to raise the temperature of the water in the clay, and to impart to it the property of greater volatility from the semi-finished products during their drying. Steamed in the above-mentioned aggregates, the clay loses a significant part of the moisture during its warming up, with the remaining moisture, the clay is immediately sent from the drying unit to the tonnier, mixed with the remaining amount of moisture, which is due to its considerable mobility (hot condition) evenly distributed by weight; Raw materials are placed on the sieve frames and immediately sent to a continuous-flow dryer with a temperature of 100-120 °, from where they can enter the kiln after 1-2 hours.

Since the clay in the dryer drum is not dried, but only warmed (steamed), which in a dryer drum or other aggregate can be achieved by reducing the residence time of the clay in it or adjusting the temperature of the hot gases, the clay will have the ability to form plastic dough. In the process of heating (steaming) the clay, the latter, although it loses a considerable amount

with waste gases, however, if desired, the amount of moisture necessary for plastic molding, for example, 10-12 / 0, can be stored in the clay. This amount of moisture is quite sufficient for plastic molding of semi-finished products from clay in its hot condition, and raw materials containing less moisture can rather dry and are more stable in substance.

If clay is used with a small amount of moisture, in order to prevent the clay from drying out and to steam it out, the latter should be moistened before entering the essential aggregate or in the essential aggregate itself.

The same results can be achieved if repeated use of combustion gases is used to heat the clay in a tumble dryer, which, when already saturated with vapor, will only heat the clay without taking moisture from it.

Thus, the method has in mind to significantly speed up the drying of ceramic semi-finished products and in some cases simplify production by eliminating grinding devices for drying clay, sieves, storage of dry clay, etc.

The subject matter of the invention.

Claims (2)

1. A method of making semi-finished ceramic products, characterized in that, in order to speed up the drying, the crushed raw clay is heated in an essential drum to partially remove water and, in a heated state, is passed through a tonneider, and then the molded products are sent to the substance. 2. A method according to Claim 1, characterized in that repeated use of hot gases is used to heat the clay in the substantial drum.