The effect of microwave radiation on mineral processing

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http://eprints.org/relation/isVersionOf http://etheses.bham.ac.uk/id/document/748 http://eprints.org/relation/isVolatileVersionOf http://etheses.bham.ac.uk/id/document/748 http://eprints.org/relation/isIndexCodesVersionOf http://etheses.bham.ac.uk/id/document/748 archive 4031 disk0/00/00/03/09 2009-11-02 15:22:06 2019-01-23 09:51:54 2011-07-19 16:15:35 thesis show 0 Vorster Werner Werner.Vorster@bateman.com Rowson Neil University of Birmingham The effect of microwave radiation on mineral processing unpub TP TN 30sch_engi The published appendices are not available in the web copy of this thesis Between 50% and 70% of the total energy used in the extraction process may be attributed to comminution. Microwave pre-treatment has been suggested as a means to decrease the energy requirements. A variety of mineral ores have been investigated and the effects of microwave radiation quantified in terms of the mineralogy, changes in the Bond Work Index, flotability and magnetic separation. It has been shown that microwave pre-treatment is most effective for coarse grained ores with consistent mineralogy consisting of good microwave absorbers in a transparent gangue (up to a 90% decrease in Bond work index for Palabora copper ore) whereas fine grained ores consisting predominantly of good absorbers are not affected as well (a reduction of only 25% in work index for Mambula ore). Although the mineralogy of minerals are affected by exposure to microwave radiation, flotability and magnetic separation characteristics have been shown not to be adversely affected, unless the microstructure is completely destroyed after prolonged microwave exposure. Computer simulations have shown that significant changes to comminution circuits are possible as a result of microwave induced work index reductions (three mills reduced to one). Purpose-built microwave units may hold the solution for more efficient mineral extraction in the near future. 2001 2001-06 graduation 2114972 eng other checked From CD in back of library deposit copy This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder. public 256 University of Birmingham School of Chemical Engineering d_ph na 2001 graduation