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Mineralogical Magazine; February 2008; v. 72; no. 1; p. 521-524; DOI: 10.1180/minmag.2008.072.1.521
© 2008 Mineralogical Society of Great Britain and Ireland
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Session 5: Contaminated environments, toxicology and human health

Metal-contaminant leaching from lead smelter fly ash using pH-stat experiments

M. Vítková1,*, V. Ettler1, O. Sebek2 and M. Mihaljevic1

1 Institute of Geochemistry, Mineralogy and Mineral Resources, Charles University, Albertov 6, 128 43 Praha 2, Czech Republic
2 Laboratories of Geological Institutes, Charles University, Albertov 6, 128 43 Praha 2, Czech Republic

* E-mail: vitkova3{at}natur.cuni.cz

ABSTRACT

Fly ash from secondary Pb metallurgy was submitted to the pH-static leaching procedure according to the PrEN 14997 European leaching standard. The 48 h pH-static leaching experiments were performed on (1) fresh untreated fly ash and (2) previously washed fly ash with a cumulative wash step of 60 l kg–1. Greater release of metallic contaminants (Pb, Cd, Zn) was observed in the acidic pH range for both ashes. Washing significantly reduced the release of Cd and Zn, but greater concentrations of Pb were observed in leachates from washed fly ash due to the more important leaching of anglesite (PbSO4). The PHREEQC-2 speciation-solubility calculations showed that anglesite, phosgenite (PbCl2·PbCO3) and laurionite (Pb(OH)Cl) are the most important solubility-controlling phases for Pb, which is the most important contaminant.






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