- Title
- Density based separations in the Reflux Classifier with an air-sand dense-medium and vibration
- Creator
- MacPherson, S. A.; Iveson, S. M.; Galvin, K. P.
- Relation
- Minerals Engineering Vol. 23, Issue 2, p. 74-82
- Publisher Link
- http://dx.doi.org/10.1016/j.mineng.2009.10.004
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2010
- 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.
- Subject
- dense medium separation; gravity concentration; coal
- Identifier
- http://hdl.handle.net/1959.13/928599
- Identifier
- uon:10391
- Identifier
- ISSN:0892-6875
- Language
- eng
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