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    Physicochemical Characterization of Organic Matter in Bayer Liquor

    Access Status
    Fulltext not available
    Authors
    Busetti, Francesco
    Berwick, Lyndon
    McDonald, Suzanne
    Heitz, Anna
    Joll, Cynthia
    Loh, J.
    Power, G.
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Busetti, F. and Berwick, L. and McDonald, S. and Heitz, A. and Joll, C. and Loh, J. and Power, G. 2014. Physicochemical Characterization of Organic Matter in Bayer Liquor. Industrial & Engineering Chemistry Research. 53 (15): pp. 6544-6553.
    Source Title
    Industrial & Engineering Chemistry Research
    DOI
    10.1021/ie4028268
    ISSN
    0888-5885
    URI
    http://hdl.handle.net/20.500.11937/48273
    Collection
    • Curtin Research Publications
    Abstract

    Organic matter in Bayer liquor from an alumina production facility in Australia was characterized in terms of its molecular weight distribution and molecular structure using a suite of complementary chromatographic, spectroscopic, and thermal and chemical degradation methods. The organic matter was characterized using high-performance size-exclusion chromatography with UV-vis detection (HPSEC-UV), Fourier transform infrared (FTIR) spectroscopy, and solid-state 13C nuclear magnetic resonance (13C NMR) spectroscopy. These techniques provided information on the apparent molecular weight distribution of the organic matter contained in the Bayer liquor, its alkyl/aromatic characteristics, and the presence of specific functional groups. The techniques of microscale sealed vessel (MSSV) pyrolysis-gas chromatography-mass spectrometry (GC-MS), flash pyrolysis-GC-MS, and online tetramethylammonium hydroxide (TMAH) thermochemolysis-GC-MS provided detailed information at a molecular level. Information on individual low-molecular-weight organic acids in the sample was also obtained using liquid chromatography- tandem mass spectrometry (LC-MS-MS). The novelty of this work is the molecular identification of nitrogen compounds, pyridines, pyrenes, quinolones, benzoquinolines, indoles, carbazoles, bipyridines, and phenylpyridines that derive from organic matter in the bauxite or its transformation products. The results from the other analysis techniques largely confirm the high aromatic content of the liquor, with varying degrees of alkyl (predominantly methyl), carboxylic, ketone, nitrile, and hydroxyl substitution. Aromatic acids were found to be abundant, although they were poorly detected using pyrolysis methods, highlighting the importance of using a suite of complementary techniques for the analysis of Bayer liquor samples.

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