Understanding microwave-assisted breakage and fracturing of hard rocks necessitates the characterisation of the dielectric properties of basic rock-forming minerals. In the literature, there is a significant discrepancy in the loss factors (i.e., the ability of minerals in absorbing microwave energy) of the gangue minerals due to the fact that different unsuitable and inconsistent measurement techniques are used. In this paper, the dielectric properties (i.e., the dielectric constant \(\varepsilon^{\prime}\) and loss factor \(\varepsilon^{\prime\prime}\)) of 14 high-grade minerals, including 11 gangue minerals and 3 ore minerals that form most of the commonly found igneous and metamorphic hard rocks, were obtained using a customised resonant cavity and the effective medium theory at 2.45 GHz and room temperature. These minerals could be classified into three categories (i.e., low, medium and high loss) based on the magnitude of their loss factors. For the low-loss and medium-loss gangue minerals, their loss factors hardly correlate to either one or a combination of the metal elements or the crystal system. The dielectric properties of minerals were then used to explain the behaviour difference of granite and basalt when exposed to microwave radiation.

中文翻译：

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硬岩矿物的介电性能及其对微波辅助压裂的影响

了解微波辅助的硬质岩石的破裂和破裂需要表征基本成岩矿物的介电特性。在文献中，由于使用了不同的不合适和不一致的测量技术，脉石矿物的损失因子（即矿物吸收微波能量的能力）存在显着差异。在本文中，介电特性（即介电常数\（\ varepsilon ^ {\ prime} \）和损耗因子\（\ varepsilon ^ {\ prime \ prime} \））使用定制的谐振腔和有效介质理论在2.45 GHz和室温下获得了14种高级矿物，其中包括11种脉石矿物和3种矿石矿物，这些矿物构成了大多数常见的火成岩和变质硬岩。根据其损失因子的大小，这些矿物可以分为三类（即低，中和高损失）。对于低损耗和中损耗的脉石矿物，它们的损耗因子几乎与金属元素或晶体系统中的一种或组合无关。然后用矿物的介电特性来解释花岗岩和玄武岩在微波辐射下的行为差异。