An investigation of the mechanisms of goethite, hematite and magnetite-seeded Al(OH)(3) precipitation from synthetic Bayer liquor

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dc.contributor.authorWebster, NASen_AU
dc.contributor.authorLoan, MJen_AU
dc.contributor.authorMadsen, ICen_AU
dc.contributor.authorKnott, RBen_AU
dc.contributor.authorKimpton, JAen_AU
dc.date.accessioned2011-12-12T23:18:38Zen_AU
dc.date.available2011-12-12T23:18:38Zen_AU
dc.date.issued2011-09-01en_AU
dc.date.statistics2011-12-13en_AU
dc.description.abstractThe precipitation of Al(OH)3 from synthetic Bayer liquor at 70 degrees C seeded with goethite, hematite and magnetite particles was investigated in order to gain insight into the nucleation and growth mechanisms in the presence of these materials. A combination of characterisation techniques was employed including conductivity analysis, particle size analysis, electron microscopy and in situ synchrotron X-ray diffraction. The magnetite seed was less active for promoting Al(OH)(3) precipitation than the goethite and hematite, based on a comparison of the induction time before the onset of measurable precipitation. For each seed material, the early stages of precipitation were characterised by relatively slow deposition of gibbsite on the seed particles. Precipitation then proceeded via a two-stage mechanism, where gibbsite and small amounts of bayerite and nordstrandite precipitated concurrently. The outcomes of this investigation have implications for the nucleation and growth of scale on mild steel process equipment, and are also relevant for alumina reversion which causes significant process losses through uncontrolled precipitation. (C) 2011 Elsevier B.V.en_AU
dc.identifier.citationWebster, N.A.S., Loan, M.J., Madsen, I.C., Knott, R.B., Kimpton, J.A. (2011). An investigation of the mechanisms of goethite, hematite and magnetite-seeded Al(OH)(3) precipitation from synthetic Bayer liquor. Hydrometallurgy, 109(1-2), 72-79. doi:10.1016/j.hydromet.2011.05.011en_AU
dc.identifier.govdoc3824en_AU
dc.identifier.issn0304-386Xen_AU
dc.identifier.issue1-2en_AU
dc.identifier.journaltitleHydrometallurgyen_AU
dc.identifier.pagination72-79en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.hydromet.2011.05.011en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/3928en_AU
dc.identifier.volume109en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectGoethiteen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectSynchrotronsen_AU
dc.subjectLiquidsen_AU
dc.subjectHematiteen_AU
dc.subjectIron oxidesen_AU
dc.titleAn investigation of the mechanisms of goethite, hematite and magnetite-seeded Al(OH)(3) precipitation from synthetic Bayer liquoren_AU
dc.typeJournal Articleen_AU
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