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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/4826

Title: Transport processes during electrowashing of filter cakes
Authors: Kilchherr, R.
Koenders, M.A.
Wakeman, Richard J.
Tarleton, E.S.
Keywords: Electroosmosis
Porous media
Transport processes
Filter cake washing
Issue Date: 2004
Publisher: © Elsevier
Citation: KILCHHERR, R. ... et al, 2004. Transport processes during electrowashing of filter cakes. Chemical Engineering Science, 59 (5), pp. 1103-1114
Abstract: Applications of electric fields during washing of filter cakes increases the removal rate of ions from the cake mother liquor, and under appropriate conditions the field also increases the wash flow rate by electroosmosis. Experimental data that show the key effects of the fields on the rates of ion mass transfer are presented: with the downstream electrode acting as a cathode, cation removal rates are increased whilst the removal rate of the anions is decreased. The concentration profile of the cations with washing time shows an increase in concentration to a value above that of the mother liquor, before it decreases due to displacement by the fresh wash liquor. A model is formulated that describes the advection, dispersion, ion migration and electroosmosis transport processes in the cake. Numerical solution of the model gives cation concentration profiles at the exit of the cake that are in qualitative agreement with the experimental observations. Experimentally measured wash liquor flow rates tend to be lower than what traditional colloid science principles predict by a factor of 5 to 10: reasons for this difference, supported by experimental work from other researchers, are discussed.
Description: This article was published in the journal, Chemical Engineering Science [© Elsevier] and the definitive version is available at: http://www.elsevier.com/wps/find/journaldescription.cws_home/215/description#description
Version: Accepted for publication
DOI: 10.1016/j.ces.2004.01.006
URI: https://dspace.lboro.ac.uk/2134/4826
ISSN: 0009-2509
Appears in Collections:Published Articles (Chemical Engineering)

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