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Understanding microwave induced sorting of porphyry copper ores

John, R.S.; Batchelor, A.R.; Ivanov, D; Udoudo, O.B.; Jones, D.A.; Dodds, Chris; Kingman, S.W.


Ackroyd Stuart Assistant Professor

D Ivanov

O.B. Udoudo

D.A. Jones

Professor of Process Engineering

Pro-Vice Chancellor Faculty of Engineering


Global demand for minerals and metals is increasing. It has been established that the impact of mining and mineral processing operations must be reduced to sustainably meet the demands of a low grade future. Successful incorporation of ore sorting in flow sheets has the potential to improve energy efficiency by rejecting non-economic material before grinding. Microwave heating combined with infra-red temperature measurement has been shown to distinguish low and high grade ore fragments from each other. In this work, experimentally validated 2-D finite difference models of a theoretical two phase ore, representing typical fragment textures and grades, are constructed. Microwave heating is applied at economically viable energy inputs and the resultant surface thermal profiles analysed up to 2 minutes after microwave heating. It is shown that the size and location of grains can dramatically alter surface temperature rise at short thermal measurement delay times and that the range of temperatures increases with increasing fragment grade. For the first time, it is suggested that increasing the delay time between microwave heating and thermal measurement can reduce the variation seen for fragments of the same grade but different textures, improving overall differentiation between high and low grade fragments.


John, R., Batchelor, A., Ivanov, D., Udoudo, O., Jones, D., Dodds, C., & Kingman, S. (2015). Understanding microwave induced sorting of porphyry copper ores. Minerals Engineering, 84, doi:10.1016/j.mineng.2015.10.006

Journal Article Type Article
Publication Date Dec 1, 2015
Deposit Date Nov 2, 2015
Publicly Available Date Dec 1, 2015
Journal Minerals Engineering
Print ISSN 0892-6875
Electronic ISSN 0892-6875
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 84
Keywords microwave, ore, copper, sorting, modelling
Public URL
Publisher URL
Copyright Statement Copyright information regarding this work can be found at the following address:


MINE-D-15-00530 Manuscript.pdf (718 Kb)

Copyright Statement
Copyright information regarding this work can be found at the following address:

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