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|Title: ||Electrically enhanced washing of ionic species from fine particle filter cakes|
|Authors: ||Tarleton, E.S.|
Wakeman, Richard J.
|Keywords: ||Electric field|
Particle surface cleaning
|Issue Date: ||2003|
|Publisher: ||© Elsevier|
|Citation: ||TARLETON, E.S., WAKEMAN, R.J. and LIANG, Y., 2003. Electrically enhanced washing of ionic species from fine particle filter cakes. Chemical Engineering Research and Design, 81 (2), pp. 201-210|
|Abstract: ||A technique to enhance the removal of solutes and unwanted liquors from fine particle filter cakes
by the application of an electric field during washing has been developed. For aqueous feeds of
titania (rutile), the effects of DC electric field strength as well as cake and suspension properties
such as pH and ionic strength were investigated experimentally.
Cake washing experiments showed how the rate of removal of cations (Na+ and Al3+) and wash
liquors could be increased substantially at raised electric field when the downstream electrode
worked as the cathode and the suspension forming the cake was at a pH well removed from its
iso-electric point (IEP). In some circumstances, cations remaining from the initial production
process of rutile could be removed from the particle surfaces by the electric field. For anions
2-, Cl- and NO3
-) under the same experimental conditions, the removal rate also varied with the
electric field but in a manner generally contrary to that observed for the cations. When the polarity
of the electrodes was reversed reduced effects were observed, however, a modest increase in the
removal rate of anions was detected at longer wash times.
With suspensions adjusted to their IEP, filter cakes formed with more open structures and larger
values of porosity. For cake washing under these circumstances an increase in the cation removal
rate was noted, however, liquor flow rates tended to reduce when the electric field strength was
increased and cake porosity decreased with time during the course of washing.|
|Description: ||This article was published in the journal, Chemical Engineering Research and Design [© Elsevier] and the definitive version is available at: http://www.elsevier.com/wps/find/journaldescription.cws_home/713871/description#description|
|Version: ||Accepted for publication|
|Appears in Collections:||Published Articles (Chemical Engineering)|
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