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Proceedings Paper

Density segregation of granular material in a rotating cylindrical tumbler
Author(s): Dale Hayter; Gerald Pereira; Kurt Liffman; Ben Aldham; Sam Johns; Ilija D. Sutalo; Geoffrey Brooks; Paul Cleary; Guy Metcalfe
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Paper Abstract

Many mining operations use large quantities of water to separate valuable minerals from less valuable gangue. This dependence on liquid separation has an environmental impact in terms of energy and water use and also implies a cap on production due to the availability of water. To address these problems, the CSIRO has developed the CSIRO Rotational Classifier, which - by using the phenomena of rotational segregation - can quickly separate dry granular material in terms of size and/or density without the use of any liquids. The purpose of this paper is to obtain a deeper understanding of how rotational segregation can separate particles of different densities in a rotating cylinder, free from any interstitial fluids. This was accomplished by analyzing a cross section at the 20% fill level in a 50% full classifier, which contained a 50-50 ratio of glass and lead beads. The granular bed was sampled at different time intervals over a 60 second period with a classifier rotation rate of 2 rpm. These experiments resulted in a high segregation level of 0.9 in 20 seconds and 0.95 by 60 seconds (where a level of 1 implies full segregation). The results then underwent image analysis and were subsequently compared to results from a discrete element method (DEM) model where similar segregation ratios, albeit at longer timescales, were obtained. This study gave a further insight into the segregation process particularly in terms of axial formation of the segregated core which may one day be used in the separation of minerals.

Paper Details

Date Published: 30 December 2008
PDF: 10 pages
Proc. SPIE 7270, Biomedical Applications of Micro- and Nanoengineering IV and Complex Systems, 727010 (30 December 2008); doi: 10.1117/12.814431
Show Author Affiliations
Dale Hayter, Swinburne Univ. of Technology (Australia)
Gerald Pereira, Commonwealth Scientific and Industrial Research Organisation (Australia)
Kurt Liffman, Commonwealth Scientific and Industrial Research Organisation (Australia)
Ben Aldham, Commonwealth Scientific and Industrial Research Organisation (Australia)
Sam Johns, Commonwealth Scientific and Industrial Research Organisation (Australia)
Ilija D. Sutalo, Commonwealth Scientific and Industrial Research Organisation (Australia)
Geoffrey Brooks, Swinburne Univ. of Technology (Australia)
Paul Cleary, Commonwealth Scientific and Industrial Research Organisation (Australia)
Guy Metcalfe, Commonwealth Scientific and Industrial Research Organisation (Australia)


Published in SPIE Proceedings Vol. 7270:
Biomedical Applications of Micro- and Nanoengineering IV and Complex Systems
Dan V. Nicolau; Guy Metcalfe, Editor(s)

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