Characteristics of variability of trace elements in coal ash from the 610 and 620 coal seams (the Poruba beds) of the Upper Silesian Coal Basin

摘要

The coal seams 610 and 620 from the Poruba beds (Namurian A) are characterized by considerable variability of content of trace elements in coal ash (Hanak, Kokowska-Pawlowska 2002), thought to be connected with the occurrence of the rock bands in these coal seams. Therefore before sampling, lithologic and petrographic profiles were done. In examined profiles of the coal seams complex lithotypes, characterized by laminated structure, were found. These lithotypes were determined according to Diessel's classification (1992), mainly: semi-vitreous laminated coal, rarely vitreous laminated coal and dull laminated coal.