The paper presents the results of investigation concerning using a high-temperature pigment based on synthetic tri-manganese tetra-oxide (Mn3O4) in the production of volume-colored bricks using red-burning clay. It is established that the introduction of a pigment in the amount of 2–4% results in a rich dark brown brick. At the same time, the intensity of the color increases with an increase in the pigment concentration from 2 to 4% and a brick firing temperature from 800 to 950°C. It has been established that with the introduction of pigment the strength of the obtained brick samples decreases, as well as the frost resistance.
How the degree of grinding of clays with carbonate inclusions in the form of dolomite affects the quality of ceramic products, is examined. It is shown that unusable clay with large dolomite inclusions can be used in ceramic production after grinding particles to a size of less than 0.5 mm. It has been established that fine grinding of clay can eliminate the formation of “blowing” defect, while the frost resistance of ceramics increases. Clay unsuitable in the ceramic production can be used after fine processing to produce facing building bricks with a compressive strength above 15 MPa and frost resistance of more than 50 cycles, ceramic roof tiles with frost resistance of more than 100 cycles, majolica and water-proof pottery products.
To determine the possibility of using a mineral pigment based on the rutile form of titanium dioxide in the production of volume-colored ceramic brick in order to obtain lighter brick tones the studies are conducted. The previously studied low-melting clay of the Tyumen deposit was used as a basis. It was established that significant lightening of the brick does not occur even with the introduction of 8% of the specified pigment, although some lightening is appeared. In addition, with the pigment introduction, an increase in water absorption of bricks is observed, which leads to a decrease in the sample strength. Increasing the firing temperature to 950°C does not lead to an improvement in the quality characteristics of the samples, and even vice versa makes them worse. Thus, the use of a white pigment under investigation does not give a significant effect of lightening of ceramic red-burning clay.
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