Recovery of Zinc by Reaction between Electric Arc Furnace Dust and Calcium Chloride

Abstract

The chlorination and volatilization behavior of zinc was investigated by the reaction between ZnO, ZnFe₂O₄ and CaCl₂. Experiments were conducted in a nitrogen atmosphere by using horizontal electric furnace. As a result of changing the ratio of zinc oxide to zinc ferrite at 1000ºC, it was expected that ZnO and ZnFe₂O₄ were chloride volatilized at the same time. In the kinetic study at 950ºC-1030ºC, Jander’s equation showed the experimental result well in the reaction system of this study, and the activation energy was 237 ± 18 kJ / mol. It was also found that carbon influenced the reaction product determination. FeO and CaFe₂O₄ were formed in the presence of carbon, and Ca₂Fe₂O₅ was formed in the absence of carbon.