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

Published online by Cambridge University Press:  05 July 2018

M. Vítková ,
V. Ettler ,
O. Šebek  and
M. Mihaljevič
M. Vítková*
Affiliation:
Institute of Geochemistry, Mineralogy and Mineral Resources, Charles University, Albertov 6, 128 43 Praha 2, Czech Republic
V. Ettler
Affiliation:
Institute of Geochemistry, Mineralogy and Mineral Resources, Charles University, Albertov 6, 128 43 Praha 2, Czech Republic
O. Šebek
Affiliation:
Laboratories of Geological Institutes, Charles University, Albertov 6, 128 43 Praha 2, Czech Republic
M. Mihaljevič
Affiliation:
Institute of Geochemistry, Mineralogy and Mineral Resources, Charles University, Albertov 6, 128 43 Praha 2, Czech Republic
*
*E-mail: vitkova3@natur.cuni.cz
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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 ofmetallic 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.

Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 1 , February 2008 , pp. 521 - 524
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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