Ural Federal University, Yekaterinburg, Russia:

S. V. Mamyachenkov, Professor, Head of the Department of Non-Ferrous Metals Metallurgy, e-mail: svmamyachenkov@yandex.ru
O. S. Anisimova, Associate Professor at the Department of Non-Ferrous Metals Metallurgy, e-mail: osanis@mail.ru
Yu. I. Toporkova, Engineer at the Department of Non-Ferrous Metals Metallurgy, e-mail: iulia.toporkova@gmail.com
D. A. Prodanova, Postgraduate student at the Department of Non-Ferrous Metals Metallurgy, e-mail: dar.kostina2013@yandex.ru

Dust from steelmaking production, in particular electric arc furnace dust (EAFD), is a rich secondary source of zinc. Different approaches to the EAFDs processing with the production of zinc oxide and metal phases as a final product have been studied. Ammonium chloride leaching is selective for zinc, does not require special acid-resistant equipment, and is relatively cheap. The advantages of this method are the possibility of obtaining metallic zinc as a commercial product and the absence of the need for additional solution purification from iron and chlorine ions. Chemical and mineral characterization of Waelz-oxide after the first stage of calcination are presented, the main identified phase is zinc oxide (ZnO), a small amount of Zn associated with iron (Zn₂Fe₂O₄) in the ferrites form and lead in the oxide phase (PbO) are also determined. The thermodynamic analysis of the Zn(II) – NH₄Cl – NH₃ – H₂O system in the HYDRA software medium was carried out, the main zinc compounds were determined under leaching conditions. A matrix of changing conditions is compiled with using the full three-factor experiment method. Based on the obtained results, in the Statistica-10 program, three-dimensional dependences of zinc extraction on varied parameters were constructed and equations describing these dependencies were obtained. The optimal leaching parameters were determined: the concentration of ammonium chloride 4 mol/dm³, the concentration of ammonia 4 mol/dm³, the ratio L:S = 15.

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