Electrowashing CES 2004 repository.pdf (503.44 kB)
Download fileTransport processes during electrowashing of filter cakes
journal contribution
posted on 2009-06-10, 13:44 authored by R. Kilchherr, M.A. Koenders, Richard J. Wakeman, Steve TarletonApplications 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.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Chemical Engineering
Citation
KILCHHERR, R. ... et al, 2004. Transport processes during electrowashing of filter cakes. Chemical Engineering Science, 59 (5), pp. 1103-1114Publisher
© ElsevierVersion
- AM (Accepted Manuscript)
Publication date
2004Notes
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#descriptionISSN
0009-2509Language
- en