Abstract
Abstract This paper describes the concentration of metallic elements in various size of fly ash particles resulting from coal combustion. Different methods to study the distribution of particle sizes ranging from 0,36–100 μm are applied. Based on the increase of concentration in the finest particles due to the volatilization‐condensation, the elements were grouped in 3 classes: elements which are not volatilized during coal combustion Al, Ca, Ti, Mg and Ba (class 1); elements which are enriched on the surface of the finest particles Ni, Cu, Zn, Co, Cr, Mo and Cd (class 2) and elements which present an intermediary behaviour Pb (class 3). The behaviour differences of metallic elements in coal combustion are explained by their different coal geochemical associations: organic matter and inorganic matter (sulphides and non sulphides).
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