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

V. Ettler^1,*, J. Jehlika¹, V. Maek^1,2 and J. Hruka³

¹ Institute of Geochemistry, Mineralogy and Mineral Resources, Charles University, Albertov 6, 128 43 Praha 2, Czech Republic
² Geomin, Znojemská 78, 586 56 Jihlava, Czech Republic
³ Czech Geological Survey, Geologická 6, 152 00 Praha 5, Czech Republic

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

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: slag, Pb metallurgy, leaching, fulvic acid, peat water, MINTEQA2, soil environment

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