Microwave heating of dry and water saturated basalt, granite and sandstone
by Thomas Peinsitt, Friedemar Kuchar, Philipp Hartlieb, Peter Moser, Hubert Kargl, Uwe Restner, Nikolaus A. Sifferlinger
International Journal of Mining and Mineral Engineering (IJMME), Vol. 2, No. 1, 2010

Abstract: The heating of rocks with low to medium microwave absorption strength and its dependence on the water content is investigated in a 3 kW microwave oven at 2.45 GHz. Sandstone, granite, and basalt are chosen as the rock materials where basalt has the relatively highest absorption strength in the dry state. The effect of the microwaves at low energy input is investigated by measurements of the uniaxial compressive strength and the ultrasound velocity. The latter is found to be more reliable and is used for deducing trends caused by microwave irradiation. The largest effect due to the water content is observed in sandstone. At high energy input in basalt the interior melts and the samples break.

Online publication date: Wed, 24-Feb-2010

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