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Chemija / Chemistry

ISSN 0235-7216
ISSN 2424-4538 (online)

2011 m. Nr. 1

Comparison of the total and fractionated heavy metal and sulphur concentrations in bottom ash and fly ash from a large-sized (120 MW) power plant of a fluting board mill
Kati MANSKINEN, Risto PÖYKIÖ, Hannu NURMESNIEMI

According to the XRD spectra, both ashes contained microcline (K(AlSi3O8)) and quartz (SiO2). However, hematite (Fe2O3) and dolomite (CaMg(CO3)2) only existed in fly ash and bottom ash, respectively. The total element concentrations were 1.1 (Zn) to 45.1 (S) times higher in fly ash than those in bottom ash. According to three-stage sequential extraction procedure of the European Standards, Measurement and Testing (SM & T) Program (formerly the Community Bureau of Reference (BCR), in which elements in bottom ash and fly ash were fractionated among acid-soluble (CH3COOH; BCR 1), reducible (NH2OH-HCl; BCR 2) and oxidizable (H2O2 + CH3COONH4; BCR 3) fractions, the concentrations of most elements were higher in all fractions of fly ash than those in bottom ash. However, in the BCR 1 fraction, the extractable concentrations of Al, Ba, Be, Cu, Fe, V and Zn, as well as of Fe and Zn in the BCR 3 fraction and Ti in all BRC fractions, were higher in bottom ash than the corresponding heavy metal concentrations in the fly ash. The results are discussed in relation to observations in the literature concerning heavy metals and sulphur release from a sample matrix under different extraction conditions.

Keywords: ash, sequential extraction, heavy metals, leaching, waste

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