Immobilization of Arsenic in Mine Tailings using Standard and Nanoscale Metal Oxides
Sevag Derghazarian, Catherine N. Mulligan
In the proceedings of: GEO2010 Calgary: 63rd Canadian Geotechnical Conference & 6th Canadian Permafrost ConferenceSession: T1-C
ABSTRACT: Elevated levels of arsenic can be found in mine tailings, sediment and soil samples. Leaching of arsenic from tailings can lead to the contamination of surface and groundwater. In the current study, the effectiveness of various types of metal oxides as immobilizing agents was tested. Leaching tests and SSE (selective sequential extraction) were performed on different mixtures of mine tailings and metal oxides, using different weight ratios, reaction times, types of oxides. Both nanoscale and regular ZnO were found to significantly reduce arsenic leaching from Noranda mine tailings, whereas Fe3O4 had no significant effect.
RÉSUMÉ: Les niveaux élevés d'arsenic ont été trouvés dans des résidus miniers, sédiments et échantillons de sol. La lixiviation d'arsenic des résidus peut résulter dans la contamination des eaux de surface et souterraine. Dans cette étude, la performance des quelques types des oxydes métalliques comme des agents immobilisants ont été testés. Les tests de lixiviation et d'extraction séquentielle sélective ont été effectués avec des mélanges divers des résidus miniers et oxydes métalliques, en utilisant des ratios divers en poids, temps de réactions, et types d'oxydes. Les deux formes d'agents, nano échelle et régulier, d'oxyde de zinc, était capable de réduire la lixiviation d'arsenic des résidus miniers de Noranda, mais Fe3O4 n'est pas efficace. 1 INTRODUCTION Arsenic (As) is a highly toxic metalloid and is widely
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Sevag Derghazarian; Catherine N. Mulligan (2010) Immobilization of Arsenic in Mine Tailings using Standard and Nanoscale Metal Oxides in GEO2010. Ottawa, Ontario: Canadian Geotechnical Society.
@article{GEO2010_184,
author = Sevag Derghazarian; Catherine N. Mulligan,
title = Immobilization of Arsenic in Mine Tailings using Standard and Nanoscale Metal Oxides,
year = 2010
}
title = Immobilization of Arsenic in Mine Tailings using Standard and Nanoscale Metal Oxides,
year = 2010
}