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    Modelling a semi-batch reative precipitation of ferrihydrite

    19894_downloaded_stream_412.pdf (768.3Kb)
    Access Status
    Open access
    Authors
    Richmond, William
    Li, T.
    Ilievski, D.
    Date
    2005
    Type
    Conference Paper
    
    Metadata
    Show full item record
    Citation
    Richmond, William and Li, T.S. and Ilievski, D.. 2005. : Modelling a semi-batch reative precipitation of ferrihydrite, in Dixon, D.G. and Dry, M.J. (ed), 35th Annual Hydrometallurgy Meeting held in conjunction with 44th Annual Conference of Metallurgists of CIM, Aug 21 2005, pp. 377-386. Calgary, Alberta, Canada: Met Soc.
    Source Title
    Computational Analysis in Hydrometallurgy 35th Annual Hydrometallurgy Meeting, held in conjunction with COM 2005
    Source Conference
    35th Annual Hydrometallurgy Meeting held in conjunction with 44th Annual Conference of Metallurgists of CIM
    Additional URLs
    http://www.metsoc.org/
    Faculty
    Department of Applied Chemistry
    Division of Engineering, Science and Computing
    Faculty of Science
    Remarks

    Originally published by the Metallurgical Society of CIM as:

    Richmond, William and Li, T.S. and Ilievski, D. (2005) Modelling a semi-batch reative precipitation of ferrihydrite, in Dixon, D.G. and Dry, M.J. (ed), Computational Analysis in Hydrometallurgy 35th Annual Hydrometallurgy Meeting, held in conjunction with COM 2005, pp. 377-386, Calgary, Alberta, Canada, Aug 21 2005. Met Soc, Canada.

    URI
    http://hdl.handle.net/20.500.11937/4513
    Collection
    • Curtin Research Publications
    Abstract

    The reactive precipitation of ferrihydrite was studied in a laboratory semi-batch precipitator, where a highly concentrated sodium hydroxide solution was fed into an iron nitrate solution. Instantaneous hydrolysis of iron[III] takes place when the two reagents are mixed generating supersaturation, and leading to immediate precipitation of ferrihydrite via a primary nucleation mechanism then followed by limited crystallite frowth to 3 to 7nm. A mathematical model of the semi-batch laboratory precipitator was used to simulate the pH responses during the precipitation of ferrihydrite at different reagent feed rates. The model comprised of interconnected compartments of averaged hydrodynamic conditions, incorporating physically meaningful turbulent mixing time constants. The precipitation process is described by the solute concentration conservation equation incorporating a postulated ferrihydrate primary nucleation model. It was found that the semi-batch precipitator model predicted teh experimental pH response reasonable well. The experimental results demostrated that the reagent feed rate has a critical effect on the course of the precipitation of ferrihydrite, i.e. it is a rate determining step given the fast hydrolysis and precipitation kinetics.

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