Modified bauxite refinery residues for immobilizing U(VI)

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dc.contributor.authorClark, MWen_AU
dc.contributor.authorPayne, TEen_AU
dc.contributor.authorHarrison, JJen_AU
dc.contributor.authorCormarmond, MJen_AU
dc.contributor.authorDore, MJen_AU
dc.contributor.authorCollins, RNen_AU
dc.date.accessioned2022-12-20T00:27:56Zen_AU
dc.date.available2022-12-20T00:27:56Zen_AU
dc.date.issued2012-10-16en_AU
dc.date.statistics2022-02-02en_AU
dc.description.abstractBauxite refinery residues (BRR) are a waste from the production of alumina using the Bayer process, which has high pH and soluble alkalinity. However, a modified BRR (MBRR) can be made using Mg and Ca to precipitate alkalinity as acid neutralizing capacity (ANC), which lowers pH from ≈13 to ≈8.5. The combined effects of a fine-grained mineral mix providing high surface area across a range of minerals for metal removal, and an ANC (3-5 mol/kg), gives MBRR potential for many environmental remediation and wastewater-treatment applications. We conducted several laboratory experiments that investigate and assess the application potential of MBRR for the environmental remediation U(VI). Isotopic exchange data show that U(IV) is, in part, irreversibly bound and that irreversibility increases with increased surface loading; it is also age- and temperature-sensitive. Synchrotron X-ray absorption techniques (EXAFS and XANES) suggest that a limited number of minerals bind U(VI), and the mechanisms and minerals involved are U(VI) concentration dependent. Data indicate that U(VI) binding is initiated by adsorption, largely to the hematite, but precipitation dominates as U(VI) concentration increases. This in turn suggests that irreversibility in the U(VI) binding is driven by precipitate re-crystallization rather than intra-particulate diffusion into adsorbing minerals. Moreover, the results of this work suggest that MBRR may well be useful in the environmental remediation of U(VI) contaminated soils and waters.en_AU
dc.identifier.citationClark, M. W., Payne, T. E., Harrison, J. J., Comarmond, M. J., Dore, M. J. & Collins, R. (2012). Modified bauxite refinery residues for immobilizing U(VI). Paper presented to the 12th South Pacific Environmental Radioactivity Association Conference (SPERA 2012), Sydney, Australia, 16 October – 19 October 2012 . Lucas Heights, NSW: Australian Nuclear Science and Technology Organisation. (pp. 23).en_AU
dc.identifier.conferenceenddate19 October 2012en_AU
dc.identifier.conferencename12th South Pacific Environmental Radioactivity Association Conference (SPERA 2012)en_AU
dc.identifier.conferenceplaceSydney, Australiaen_AU
dc.identifier.conferencestartdate16 October 2012en_AU
dc.identifier.pagination23en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14212en_AU
dc.language.isoenen_AU
dc.publisherAustralian Nuclear Science and Technology Organisationen_AU
dc.subjectBauxiteen_AU
dc.subjectResiduesen_AU
dc.subjectMagnesiumen_AU
dc.subjectAcid neutralizing capacityen_AU
dc.subjectCalciumen_AU
dc.subjectMineralsen_AU
dc.subjectAdsorptionen_AU
dc.subjectSoilsen_AU
dc.subjectWateren_AU
dc.subjectUraniumen_AU
dc.titleModified bauxite refinery residues for immobilizing U(VI)en_AU
dc.typeConference Abstracten_AU
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