@ARTICLE{Szczepek-Wcisło_Katarzyna_Characteristics_2000,
 author={Szczepek-Wcisło, Katarzyna and Wyszomirski, Piotr},
 number={No 2},
 journal={Gospodarka Surowcami Mineralnymi - Mineral Resources Management},
 pages={25-41},
 howpublished={online},
 year={2000},
 publisher={Komitet Zrównoważonej Gospodarki Surowcami Mineralnymi PAN},
 publisher={Instytut Gospodarki Surowcami Mineralnymi i Energią PAN},
 abstract={The Tertiary Krakowicc clay deposit in Kolbuszowa-Kupno is one of the biggest in south-eastern Poland. The clay is ill i tic in character. Together with ill i te there occur other clay minerals (kaolinite, smectitcs, chloritcs), non-clay ones (quartz, calcite, feldspars) and organic matter. Taking into account grain size distribution, one can point to the possibility of applying this mineral raw material for the production of such structural clay products as lightweight brics and blocks. The clay studied is characterized by high plasticity as well as relatively low make-up water and drying shrinkage. The natural radioactivity coefficients f1 and f2 for the clay studied arc significantly lower than permissible Polish limits for structural clay products and their raw materials. During firing of clay samples the compressive strength and shrinkage of the body increase while the permeability decreases. These processes arc intensified at a temperature of 1050°C. During firing of the clay studied, mainly water vapour and carbon dioxide arc released. The lack of the emission of such detrimental volatiles as SOx and HF is advantageous from the environmental viewpoint. The comparison of technological properties of products made of clay of the Kolbuszowa-Kupno deposit, manufactured by traditional method and by fast firing method indicates that the time of the production procccs can be remarkably reduced without significant influence on technological parameters of the ceramic body obtained.},
 type={Artykuł},
 title={Characteristics of krakowiec clay from Kolbuszowa-Kupno deposit as a mineral raw material},
 URL={http://journals.pan.pl/Content/132774/PDF-MASTER/4_GSM_16_2_2000_Szczepek_Wscislo_Charakterystyka.pdf},
 keywords={Clay rocks, Krakowiec clays, raw materials of building ceramics},
}