Abstract
A facile route was proposed to prepare zinc ferrite as a heavy-metal adsorption material from high‑zinc electric arc furnace (EAF) dust by roasting it directly with the addition of low-cost Fe2O3, followed by purification via dilute acid leaching. The effect of the addition of Fe2O3, revealed by the Fe/Zn molar ratio, on the formation of zinc ferrite was investigated. The results showed that adding Fe2O3 could increase the percentage of acid-insoluble zinc in the form of zinc ferrite to 94.13% after roasting at 1000 °C for 2 h with the Fe/Zn molar ratio of 1.8. After removing Ca2ZnSi2O7 impurity and nano bead milling, the product could be used as a good adsorbent due to its superior adsorption capacities of 198.26 mg/g, 24.95 mg/g, and 151.45 mg/g for Pb (II), Cr (VI), and Cd (II), respectively. This study offered a novel method for overall and value-added utilization of EAF dust.
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