Skład mineralny i własności ceramiczne neogeońskich iłów ze złoża "Słowiany"

Ryszard Wyrwicki

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MINERAL COMPOSITION AND CERAMIC PROPERTIES OF NEOGENE CLAYS FROM THE "SŁOWIANY" DEPOSIT

Summary
The Słowiany deposit is situated NE of Nawojów Łużycki in the Jelenia Góra voivodeship. It mainly comprises mottled clays as well as some amounts of light-grey and light-brown clays infilling an inferred small intermontane depression of unknown depth. According to the borehole data, clays are over 20 m thick.
The results of granulometric and chemical (Table l), X-ray (Fig. l) and X-ray-structural (Fig. 2) analyses have shown that clays consist of 50-60% of clay minerals and some amounts of quartz, goethite and hematite. Kaolinite is the main mineral and smectite, illite, and illite-smectite mixed-layer phase occur in subordinate amounts. Mottled clays from Słowiany differ, therefore, from macroscopically similar but beidellite in composition mottled Poznań clays Pliocene).
Ceramic properties of the three clay varietes are similar. Figure 3 shows dependence of physical properties of ceramic material obtained by firing of these clays on temperature of firing. Technological properties of these clays are as follows: drying shrinkage - 6.0-6.5%, bound water - 27-30%, maximum temperature of kilning - 1250°C. Two kinds of ceramic material may be obtained from these clays: one, porous, with water absorption ranging from 6 to 17.5% and strength to compression from 150 to 595 kG/cm2, and the other, kilned, with water absorption from 2.5 to 6.0% and strength to compression from 520 to 1120 kG/cm2. At present, these clays are used for production of klinker and klinker coating plates.

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