Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/928599

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Title
Density based separations in the Reflux Classifier with an air-sand dense-medium and vibration
Author/Creator
MacPherson, S. A.;  Iveson, S. M.;  Galvin, K. P.
Institution
The University of Newcastle. Faculty of Engineering & Built Environment, School of Engineering
Description
The Reflux Classifier is a device consisting of parallel inclined channels above a fluidized bed. Water-based versions of the system have been successfully employed in industry for gravity separation of −2 + 0.25 mm coal and mineral matter. In this study an air-fluidized system was investigated using a single 2 m long inclined channel with 100 mm wide channels and 20 mm perpendicular spacing. Sand (−355 + 125 micron) was used as a dense–medium and vibration at two distinct levels was used to improve fluidization stability. Tracer particles of −6.35 + 1.00 mm nominal diameter and 1300 to 2400 kg/m³ density were used to study the effects of the vibration energy and vibration direction on the separation efficiency. The device was able to separate coal particles from a maximum of 8 mm down to 1 mm on the basis of density; hence this method has potential for industrial application. Results were analysed using a simple 2-parameter dispersion–convection model. Dense particles had negative slip velocities, low-density particles had positive slip velocities and the slip velocities were proportional to particle diameter.
Relation
Minerals Engineering Vol. 23, Issue 2, p. 74-82
Publisher Link
http://dx.doi.org/10.1016/j.mineng.2009.10.004
Date
2010
Publisher
Elsevier
Keyword(s)
dense medium separation;  gravity concentration;  coal
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/928599
Identifier
ISSN:0892-6875
Reviewed
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Subject
"Minerals Engineering"
 
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