Abstract Dielectric property of laterite ores plays a key role in the determination of its treatment effect by microwave. However, till date, to our knowledge, there is no article reported on the dielectric property of laterite ores up to the nickel–iron alloy extraction temperature of around 1200 °C, which impedes the efficient application of microwave power in the nickel–iron alloy extraction. This paper, in view of this, aims to provide the dielectric property variation of laterite ores treated by microwave radiation from room temperature up to 1250 °C. A custom-designed ridge waveguide-based system is applied to perform the measurement. To verify the reliability of the measured results and explain the experimental phenomenon, X-ray diffraction (XRD) and scanning electron microscope (SEM) analysis are employed to conduct a thorough understanding on the variation of dielectric properties of laterite ores under different temperatures. The measured data are qualitatively verified by its temperature change tendency, SEM and XRD analysis. This work may be helpful to avoid thermal runaway, design more efficient microwave devices and optimize the existing production line of microwave treating laterite ores.

中文翻译：

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微波辐射下红土矿介电特性研究

摘要 红土矿石的介电特性在决定其微波处理效果中起关键作用。然而，迄今为止，据我们所知，还没有关于红土矿石在镍铁合金提取温度达到 1200 °C 左右时的介电性能的文章，这阻碍了微波功率在镍铁合金中的有效应用。萃取。有鉴于此，本文旨在提供微波辐射处理的红土矿石从室温到1250°C的介电性能变化。使用定制设计的基于脊形波导的系统来执行测量。为验证测量结果的可靠性并解释实验现象，通过X射线衍射（XRD）和扫描电子显微镜（SEM）分析，深入了解不同温度下红土矿石介电性能的变化。通过其温度变化趋势、SEM和XRD分析对实测数据进行定性验证。这项工作可能有助于避免热失控，设计更高效的微波装置，优化现有的微波处理红土矿石生产线。