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Lu, Gao-ming; Li, Yuan-hui; Hassani, Ferri; Zhang, Xiwei
Applied thermal engineering, 02/2017, Letnik: 112Journal Article
•Different rock-forming minerals present very different microwave absorption capacity to microwave energy.•The test results can be used to estimate the heating behaviors of rocks to microwave irradiation.•SEM-EDX technique was used to determine the elemental distribution and mineralogical composition.•Ferrum may influence the interacting mechanisms between rock-forming minerals and microwaves. The sample will burst into fragment when the thermal stress induced by thermal expansion greater than the ultimate strength of the rock after microwave irradiation. Microwave-assisted rock fragmentation has been illustrated to be potentially beneficial for mineral processing, mining and geotechnical engineering. In order to have a comprehensive understanding on the influence of microwave on thermo-mechanical properties of rocks, it is necessary to investigate the interaction effect between microwaves and the main rock-forming minerals. In this work, eleven rock-forming minerals were tested in a multimode cavity at 2.45GHz with a power of 2kW, subsequently, the Scanning Electron Microscopy–Energy Dispersive X-ray (SEM-EDX) was used to determine the elemental distribution and mineralogical composition of the tested samples. It was observed that different rock-forming minerals present very different susceptibility induced by microwave treatment. Enstatite presents the strongest microwave absorption capacity by a large margin and most of the rock-forming minerals are weak microwave absorbers. It is significant that the results can be used to predict the heating behaviors of rocks subjected to microwave energy. Furthermore, the SEM-EDX elemental analysis demonstrates that the microwave absorption capacity of rock-forming minerals could link to the contribution of the ferrum, which may influence the interacting mechanisms between microwaves and the rock-forming minerals.
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