Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/935104

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Title
Fine gravity separation in the reflux classifier, exploiting a high shear rate, laminar flow mechanism
Author/Creator
Galvin, K.;  Walton, K.;  Zhou, J.
Institution
The University of Newcastle. Faculty of Engineering & Built Environment, School of Engineering
Description
The Reflux Classifier is used in the gravity separation of particles over a broad range of particle sizes. The device consists of a fluidised bed zone, with a system of parallel inclined channels above. The inclined channels provide a significant hydraulic advantage over conventional fluidised beds via the so-called Boycott Effect (Boycott, 1920 ). This paper describes a new advance in fine gravity separation based on the high shear rate and laminar flow profile that arises when closely spaced inclined channels are deployed. As reported recently (Galvin et al, 2009a), a powerful density based separation mechanism develops from this arrangement, suppressing the effects of particle size. In this paper we focus on two areas, firstly the application of the separator in the laboratory for batch fractionation of particles of varying size and density to determine the grade recovery curve and hence the liberation, and secondly the step change in separation performance achieved on a continuous steady state basis when closely spaced inclined channels are used. The variation in the separation density with particle size decreases significantly, and the Ecarte Probable Error (Ep) remains at low levels over a broad size range.
Relation
XXV International Mineral Processing Congress (IMPC 2010): "Smarter Processing for the Future". XXV International Mineral Processing Congress (IMPC 2010): "Smarter processing for the future": Congress Proceedings (Brisbane, Qld 6-10 September, 2010) p. 729-738
Relation
http://www.impc2010.org
Date
2010
Publisher
Australasian Institute of Mining and Metallurgy
Keyword(s)
gravity separation;  beneficiation;  gravity concentration;  coal;  fine particles;  inclined settling
Resource Type
conference paper
Identifier
http://hdl.handle.net/1959.13/935104
Identifier
ISBN:9781921522284
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Subject
"Fine gravity separation in the reflux classifier, exploiting a high shear rate, laminar flow mechanism"
 
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