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The leaching behaviour of lead metallurgical slag in high-molecular-weight (HMW) organic solutions

Published online by Cambridge University Press:  05 July 2018

V. Ettler ,
J. Jehlička ,
V. Mašek  and
J. Hruška
V. Ettler*
Affiliation:
Institute of Geochemistry, Mineralogy and Mineral Resources, Charles University, Albertov 6, 128 43 Praha 2, Czech Republic
J. Jehlička
Affiliation:
Institute of Geochemistry, Mineralogy and Mineral Resources, Charles University, Albertov 6, 128 43 Praha 2, Czech Republic
V. Mašek
Affiliation:
Institute of Geochemistry, Mineralogy and Mineral Resources, Charles University, Albertov 6, 128 43 Praha 2, Czech Republic Geomin, Znojemská 78, 586 56 Jihlava, Czech Republic
J. Hruška
Affiliation:
Czech Geological Survey, Geologická 6, 152 00 Praha 5, Czech Republic
*
*E-mail: [email protected]
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Abstract

The reactivity of primary Pb metallurgical slags in high-molecular-weight (HMW) organic solutions has been studied in order to determine the processes of release and attenuation of metal and metalloid contaminants (Pb, Zn, Cu, As) in 'soil-like' environments. Slag was submitted to a 112-day batch leaching experiment in Suwannee River fulvic acid solution and peat water (∼50 mg DOC l–1). The leaching was coupled with investigation of the secondary phases (SEM/EDS, Raman microspectrometry) and thermodynamic speciation-solubility modelling using MINTEQA2. Metals and As are released in large amounts during the early stage of the experiment, followed by a decrease in the concentrations in the leachate as a result of adsorption on secondary (hydrous) ferric oxides (HFO/FO), predicted by MINTEQA2 calculations and confirmed on the leached slag surface by SEM and Raman spectrometry. Compared to other contaminants, Zn exhibits more pronounced mobility and is adsorbed on HFO/FO only at pH >7. Such a scavenging process may be predominant during the long-term interaction of slag with an HMW organic solution of real soil. As a result, the soil cover and subsequent re-vegetation of slag dumps may be considered as a possible scenario for slag management.

Keywords

slagPb metallurgyleachingfulvic acidpeat waterMINTEQA2soil environment
Type
Research Article
Information
Mineralogical Magazine , Volume 69 , Issue 5 , October 2005 , pp. 737 - 747
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2005

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