Relation between the petrographic content of mineral components in coal and its ash content

Empirical and analytical relations are established between the content of mineral inclusions Ml determined by petrographic analysis of the coal according to State Standard GOST 94.14–93 and the ash content A d of dry coal according to State Standard GOST 11022-95. In the empirical approach, statistical methods yield relations between Ml and A d in the form of regression equations for coals of a particular region and a system of beds with a complex set of minerals. In the more general analytical approach, Ml is divided into microcomponents (sulfides, carbonates, clay materials, quartz, etc.). Taking account of the densities of the components and their transformation on combustion, a quantitative relation between Ml and A d may be established for specific coals or their fractions in enrichment.