Solid phases responsible for Mn II, Cr III, Co II, Ni, Cu II and Zn immobilization by a modified bauxite refinery residue (red mud) at pH 7.5

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dc.contributor.authorCollins, RNen_AU
dc.contributor.authorClark, MWen_AU
dc.contributor.authorPayne, TEen_AU
dc.date.accessioned2016-06-23T04:55:42Zen_AU
dc.date.available2016-06-23T04:55:42Zen_AU
dc.date.issued2014-01-15en_AU
dc.date.statistics2016-06-23en_AU
dc.description.abstractAlthough modified bauxite refinery residues (MBRR) immobilize trace metals, the retention mechanisms in this complex multiphase material have not been examined in detail. In this study, X-ray absorption spectroscopy was used to investigate the host minerals, and retention mechanisms, responsible for binding MnII, CrIII, CoII, Ni, Cu and Zn in MBRR. High metal loadings (∼10 mM at pH 3) in aqueous phases simulated highly contaminated mine drainage environments, whereas a final pH of 7.5 represents the typical MBRR pH buffering providing surface loadings of 1.7–2.6 wt%. Under these conditions, CrIII precipitated as a solid phase similar to γ-CrOOH and/or amorphous Cr(OH)3, regardless of host mineral, whereas MnII immobilization was associated with (partial) oxidation in all cases. Cobalt and Ni precipitated primarily as hydrotalcite-like solids when in contact with the MBRR, and sodalite, gibbsite and hydrotalcite tended to dominate this process. Cu uptake by MBRR resulted from the precipitation of Cu(OH)2 although sorption processes may have made an additional contribution, whereas Zn precipitated as a solid phase similar to that of hydrozincite. The nature of the trace metal precipitate formed was often influenced by the host mineral constituent of MBRR, indicating that specific minerals in the MBRR can be primarily responsible for its metal immobilization properties, with gibbsite, hematite and hydrotalcite featuring prominently. © 2013 Elsevier B.V.en_AU
dc.identifier.citationCollins, R. N., Clark, M. W., & Payne, T. E. (2014). Solid phases responsible for Mn II, Cr III, Co II, Ni, Cu II and Zn immobilization by a modified bauxite refinery residue (red mud) at pH 7.5. Chemical Engineering Journal, 236(0), 419-429. doi:10.1016/j.cej.2013.09.101en_AU
dc.identifier.govdoc6746en_AU
dc.identifier.issn1385-8947en_AU
dc.identifier.journaltitleChemical Engineering Journalen_AU
dc.identifier.pagination419-429en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.cej.2013.09.101en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/7067en_AU
dc.identifier.volume236en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectMetalsen_AU
dc.subjectMineralsen_AU
dc.subjectBauxiteen_AU
dc.subjectGibbsiteen_AU
dc.subjectHematiteen_AU
dc.subjectCobalten_AU
dc.subjectAbsorption spectroscopyen_AU
dc.subjectResiduesen_AU
dc.subjectMinesen_AU
dc.subjectDrainageen_AU
dc.titleSolid phases responsible for Mn II, Cr III, Co II, Ni, Cu II and Zn immobilization by a modified bauxite refinery residue (red mud) at pH 7.5en_AU
dc.typeJournal Articleen_AU
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