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Mineralogical control on inorganic contaminant mobility in leachate from lead-zinc metallurgical slag: experimental approach and long-term assessment

¹ Institute of Geochemistry, Mineralogy and Mineral Resources, Faculty of Science, Charles University, Albertov 6, 128 43 Praha 2, Czech Republic
² Environnement et Procédés, BRGM, 3, avenue Claude Guillemin, 45060 Orléans cedex 2, France
³ Institut des Sciences de la Terre (ISTO), Université d’Orléans, 8, rue Léonard de Vinci, 45072 Orléans cedex 2, France

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

Lead, zinc and arsenic mobilization/attenuation processes during interactions between smelter slag and water show differences depending on the origin of the slag. The studied samples, waste from ore and car-battery processing, were submitted to long-term (365 days) batch leaching at two different initial pH values. The leachate analyses were input to the EQ3NR speciation-solubility code to speciate the solutions and determine the degree of saturation with respect to different phases, and a mineralogical investigation was made of the newly formed phases. An ‘oxidizing’ scenario can be proposed for slag waste disposal, considering that cerussite (PbCO₃) at pH >6 becomes a major solubility-controlling phase for Pb, and newly formed hydrous ferric oxides (HFO –common secondary phases under oxidizing conditions) efficiently adsorb As. No efficient scavenging mechanism was found for Zn, which was progressively leached from the slag and in particular from the ore-processing slag. Quenched glass-rich slag from old car-battery processing was found to release significant amounts of Pb, especially in acidic environments. Neither slag would therefore be suitable for recycling for civil engineering purposes. Conversely, extremely low releases of Pb, Zn and As were observed for recent car-battery processing slag, which could therefore be considered for road construction.

KEYWORDS: leaching, metallurgical slag, Pb, Zn, As, EQ3NR, thermodynamic modelling, mineral neoformation, recycling

This article has been cited by other articles:

				V. Ettler, J. Jehlicka, V. Masek, and J. Hruska The leaching behaviour of lead metallurgical slag in high-molecular-weight (HMW) organic solutions Mineralogical Magazine, October 1, 2005; 69(5): 737 - 747. [Abstract] [Full Text] [PDF]

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