Microwave heating of waste electric arc furnace dust (EAFD) for the purpose of its remediation has been studied extensively. However, these studies considered EAFD as a bulk material without addressing either the relative response of its individual constituents or the specific interactions with either the electric or magnetic fields of an electromagnetic wave. In this work, we present a study of the relative contribution of the electromagnetic wave components to the heating of EAFD constituents using separated electric and magnetic microwave fields. ZnO, ZnFe₂O₄, Fe₃O₄, and graphite were found to be the main contributors to the heating of EAFD based on their dielectric properties and heating profiles. ZnO and ZnFe₂O₄ heated only in the electric field yielding temperatures of 846 and 720 °C after heating for 30 and 40 s, respectively at a power input of 118 ± 12 W. Fe₃O₄ and graphite, in contrast, heated in both electric and magnetic fields owing to their respective magnetic and conductive nature. It is suggested that the selective magnetic heating of Fe₃O₄ has significant implications for the selective extraction of zinc and lead through thermal treatment of EAFD with halogenated plastics such as polyvinyl chloride (PVC).

已广泛研究了微波加热废电弧炉粉尘 (EAFD) 以对其进行修复。然而，这些研究将 EAFD 视为散装材料，没有解决其各个成分的相对响应或与电磁波的电场或磁场的特定相互作用。在这项工作中，我们研究了电磁波分量对使用分离的电磁微波场加热 EAFD 成分的相对贡献。发现 ZnO、ZnFe ₂ O ₄、Fe ₃ O ₄和石墨是基于其介电特性和加热曲线的 EAFD 加热的主要贡献者。ZnO 和 ZnFe ₂O ₄仅在电场中加热，分别在 118 ± 12 W 的功率输入下加热 30 和 40 秒后产生的温度分别为 846 和 720 °C 。相比之下，Fe ₃ O ₄和石墨在电和磁场由于它们各自的磁性和导电性质。这表明，Fe ₃ O ₄的选择性磁加热对通过用聚氯乙烯 (PVC) 等卤化塑料热处理 EAFD 来选择性提取锌和铅具有重要意义。