![]() The suitable condition was assessed to an EAFD to NaOH ratio of 1:3 M fraction and a temperature, T > 318 ☌ at the normal atmospheric condition. Thermodynamic calculation of the effect of different parameters on the conversion of EAFD to a suitable feedstock for the next separation stages showed that the major zinc-ferrite (ZnFe 2O 4) phase of EAFD can be potentially converted to ZnO and sodium-ferrite (NaFeO 2) intermediate phase while reacting with NaOH (>2 mol) at temperatures equal or higher than 100 ☌. In the current study, systematic thermodynamic assessments using thermochemical–software FactSage and targeted experimental investigations were carried out to assess the suitability of the caustic-roasting step of this important hybrid process. A combination of pyro and hydrometallurgical route, also known as hybrid process, has acquired considerable attention to extract Fe and Zn from electric arc furnace dust (EAFD). This material includes recyclable elements such as zinc (Zn) and iron (Fe), exclusively in the form of zinc-ferrite (ZnFe 2O 4), zincite (ZnO), magnetite (Fe 3O 4) with some other minor compounds of Si, Mn, Mg, and Pb. Electric Arc Furnace Dust (EAFD) is a byproduct of the steelmaking industry, which is one of the most significant and rapidly generated hazardous waste. ![]()
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