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

Published online by Cambridge University Press:  05 July 2018

V. Ettler ,
P. Piantone  and
J.-C. Touray
V. Ettler*
Affiliation:
Institute of Geochemistry, Mineralogy and Mineral Resources, Faculty of Science, Charles University, Albertov 6, 128 43 Praha 2, Czech Republic
P. Piantone
Affiliation:
Environnement et Procédés, BRGM, 3, avenue Claude Guillemin, 45060 Orléans cedex 2, France
J.-C. Touray
Affiliation:
Institut des Sciences de la Terre (ISTO), Université d’Orléans, 8, rue Léonard de Vinci, 45072 Orléans cedex 2, France
*
* E-mail: [email protected]
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Abstract

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

leachingmetallurgical slagPbZnAsEQ3NRthermodynamic modellingmineral neoformationrecycling
Type
Research Article
Information
Mineralogical Magazine , Volume 67 , Issue 6 , December 2003 , pp. 1269 - 1283
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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