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CHEMISTRY OF THE FLY ASH AND ITS RESPIRABLE –SIZE FRACTION (<10ΜM) FROM THE POWER UNITS OF AGIOS DIMITRIOS THERMAL POWER PLANT, NORTHERN GREECE
Abstract
Major and trace element concentrations were measured in representative fly ash samples from four Power Units of Agios Dimitrios Thermal Power Plant, Northern Greece. Major and trace element concentrations were also measured in the respirable-size fly ash fraction (<10$\mu$m) of the same samples, separated from the bulk fly ash by laboratory treatment. The respirable-size fraction, compared to the bulk fly ash was found richer in CaO and poorer in all other major oxides (SiO2, TiO2, Al2O3, Fe2O3, MnO, MgO, Na2O, K2O, P2O5 and SO3). Concerning the environmental aspects of the fly ash emissions, the ratios of an element concentration in the bulk fly ash to that of the respirable-size fly ash fraction were determined. Thirty-six elements (V, Cr, Co, Ni, Zn, Ga, Ge, As, Rb, Y, Zr, Nb, Mo, Sb, Cs, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Ta, W, Tl, Pb, Th, U) show 1.6 to more than 6.3 times lower concentrations in the respirable-size fraction, while only three elements (Sr, Ba, Cu) show more or less the same concentrations as the bulk fly ash.
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References11
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