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This work deals with the possibility of hydrometallurgical treatment electric arc furnace (EAF) dust using dilute sulfuric acid solutions. The origin of the EAF dust sample was Železiarne Podbrezová a.s., . Zinc content in the dust was 17.05 wt.% and zinc was present both as zincite ZnO and zinc ferrite ZnFe2O4. The effect of temperature, acid concentration and leaching time on zinc, iron and calcium extraction into the solution was investigated in order to optimize leaching parameters. The leaching experiments were carried out in temperature range within 20 and in aqueous solutions of sulfuric acid with concentrations of 0.05, 0.1, 0.25, 0.5 and . The maximum zinc extraction of 95 % was achieved in H2SO4 at after 90 minutes of leaching, while the iron extraction under the same conditions was 66 %. The main objective of this study was to find out conditions at which the maximum amount of zinc passes into the solution while iron remains in the solid residue. Following conditions were specified as optimum: H2SO4, . The zinc extraction under the given conditions was 65 %, while iron extraction was around 5 %.
Keywords: material recycling, hydrometallurgy, leaching kinetics, EAF dust, zinc© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.