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    Focused beam reflectance measurement for monitoring the extent and efficiency of flocculation in mineral systems

    Access Status
    Fulltext not available
    Authors
    Senaputra, A.
    Jones, Franca
    Fawell, P.
    Smith, P.
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Senaputra, Alexander and Jones, Franca and Fawell, Phillip D. and Smith, Peter G. 2014. Focused beam reflectance measurement for monitoring the extent and efficiency of flocculation in mineral systems. AlChE Journal. 60 (1): pp. 251-265.
    Source Title
    AlChE Journal
    DOI
    10.1002/aic.14256
    ISSN
    0001-1541
    URI
    http://hdl.handle.net/20.500.11937/19595
    Collection
    • Curtin Research Publications
    Abstract

    Focused beam reflectance measurement (FBRM), where a scanning laser focused through a sapphire window measures real-time reflected chord distributions without solids dilution, is attractive for characterizing flocculation performance. An enhanced measurement principle in new FBRM instruments has implications for flocculation studies, demonstrated using hematite in synthetic Bayer liquor. Comparisons of previous (M500) and new (G400) instruments were complicated by the impact of their different physical dimensions upon flocculation hydrodynamics, but the G400 clearly measured larger chords. The original measurement principle based on a reflected intensity threshold counts large low-density aggregates as multiple chords; in contrast, the change to “edge detection” (very low threshold) is more likely to see a single chord, an advantage for studying mineral systems (aggregates often >500 µm). The G400 also captures bimodal character in unweighted chord distributions, producing distinct peaks for aggregates and fines after suboptimal flocculation; such peaks are rarely well resolved in older FBRM.

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