Article ID: ISIJINT-2021-128
The volatilization of zinc in the electric arc furnace dust–CaCl2 and ZnFe2O4–ZnO–CaCl2–C reaction systems was investigated. Experiments were conducted under an N2 atmosphere in an infrared lamp heating furnace, and the activation energy of the reaction rate of zinc volatilization was determined by the Ozawa method. The activation energy in the dust–CaCl2 reaction system was 123 ± 27 kJ/mol; when the dust was decarburized, the activation energy was reduced to 84 ± 4 kJ/mol. Further, the simultaneous carbothermic reduction by the carbon contained in the dust and chloride volatilization of zinc improved the reaction rate. In the temperature range where carbothermic reduction and chlorination occur simultaneously, carbothermic reduction is favored. The reduction of metal oxides in the dust inhibits the chlorination and carbothermic reduction of zinc, reducing the reaction rate and activation energy.
