Abstract
In the recycling of zinc from electric arc furnace dust using microwave-based furnaces, the use of graphite powder as a reductant results in significant greenhouse gas emissions. In this study, graphite was replaced by a non-carbonaceous reductant in the form of silicon powder. The sample is heated in a microwave-based furnace under 7.5 kW maximum power irradiation at 2.45 GHz. The results clearly indicate that the reaction proceeded between zinc ferrite and silicon powder. The maximum removal rate of zinc obtained was 80% in cases where more than 10 times the stoichiometric amount of silicon powder was used for a heating time of more than 20 min. The apparent activation energy of microwave-based heating was 115.39 kJ/mol lower than that when heating with a conventional furnace.
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