Title: The Effect of Temperature and Roasting Time on the Conversion of Zinc Ferrite to Zinc Oxide in the Electric Arc Furnace Dust
Abstract: Abstract The dust of electric arc furnaces (EAF-dust) contains significant amounts of zinc in the form of various chemical compounds. Therefore, dust can be used as a raw material for zinc extraction. EAF-dust containing 20 wt.% Zn has been studied. The effect of dust roasting with Ca O and Na 2 CO 3 additives on the degree of conversion of ZnFe 2 O 4 to Zn O was studied experimentally. The effect of the roasting temperature of 700, 850 and 1000 °C and the roasting duration of 1, 2 and 3 hours were established. Ca O and Na 2 CO 3 additives in dust contribute to the destruction of ZnFe 2 O 4 due to the formation of Ca 2 Fe 2 O 5 and NaFeO 2 . After treatment, zinc is presented in the form of acid soluble zinc oxide. The content of acid-soluble zinc increases from 25% in the initial dust to 97 – 98% in the roasting product (“cinder”) under optimal roasting conditions.