Journal
MINERALS ENGINEERING
Volume 23, Issue 5, Pages 374-382Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.mineng.2009.11.012
Keywords
Liberation; Comminution; Sulphide ores; Oxide ores; Ore mineralogy
Funding
- Australian Research Council
- AMIRA International
- State Governments of South Australia and Victoria
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The effect of particle-bed breakage mechanisms on the liberation properties of ores remains unclear. Surprisingly few studies have been published in this area and limitations in liberation measurement techniques previously used have prevented definitive conclusions from being reached regarding whether particle-bed breakage enhances the liberation properties of mineral ores relative to conventional grinding mechanisms. In this study, two sulphide ores of differing textures were comminuted to various size distributions using impact and particle-bed breakage mechanisms in a hammer mill and a piston-die compression unit respectively. The liberation properties of the various discharge samples were then characterised using a mineral liberation analyser - a mineralogical characterisation system based on automated scanning electron microscopy. It was found that the size-by-size liberation properties of both valuable and gangue mineral phases were independent of both the method used to comminute the samples, as well as the particle size distribution of the final products. These effects are discussed in terms of how they may be exploited in liberation modelling and characterising comminution circuit performance. (C) 2009 Elsevier Ltd. All rights reserved.
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