A microstructural investigation of gibbsite crystallisation in Bayer liquors

Travis Baroni

    Research output: ThesisDoctoral Thesis

    48 Downloads (Pure)

    Abstract

    [Truncated] The microstructure and morphological characteristics of gibbsite, (Al(OH)3), crystallised from Bayer liquors, was investigated using environmental scanning electron microscopy (ESEM ), X-ray microanalysis, focused ion beam (FIB) microscopy and Monte Carlo simulations. Samples of gibbsite, prepared under carefully controlled precipitation conditions, were characterised by chemical analysis of the solution from which they were precipitated. The solution analyses showed that trace elements partition into the gibbsite during crystallisation. Polished mounts of the samples were prepared and imaged in the ESEM under conditions where charge-induced contrast is observed. The operating parameters that affect the contrast were identified and characterised and tentative explanations for the source of the contrast proposed.The charge-induced contrast observed in the images of gibbsite illustrates features that reflect processes that occur during the crystallisation and define the morphology of the particles at the various stages of crystal growth. The morphology of the particles is quantitatively described and related to the process of crystal agglomeration.
    Original languageEnglish
    QualificationDoctor of Philosophy
    Awarding Institution
    • The University of Western Australia
    DOIs
    Publication statusUnpublished - 2002

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