from the conferences organized by TANGER Ltd. provisional website
An efficient technology is currently being searched for the processing of electric arc furnace (EAF) steelmaking dust obtained at the Ural steelmaking plants. In this study, the hydrometallurgical processing of electric arc furnace dusts after Wealz process was investigated on a laboratory scale under normal temperature and pressure conditions. The Waelz-fume is the following chemical composition: 61 wt% Zn, 10 wt% Cl, 6 wt% Pb, 1 wt% Fe, 1 wt% K. The most optimal for hydrometallurgical processing are ammonia solutions, which allow to transfer zinc into the solution while lead and iron ought to remain as a solid residue. During the process complicated chemical reactions proceed with the zinc complex compounds formation resulting from the interaction between Zn2+, Cl– ions and NH3 ligands depending on the pH value. Therefore, this method does not require the introduction of additional purification stages from chlorine and fluorine ions, which make processing difficult, since their accumulation can lead to difficulty in stripping cathode zinc.The zinc behavior under the influence of ammonium chloride with ammonium as the leaching agents was discussed. Based on the obtained data plots were built and the dependence between the ratio liquid-solid (L/S), ammonium chloride and ammonium concentration were investigated. Optimal leaching parameters were determined. The possibility of zinc electroextraction from the ammonium solutions with obtained cathode zinc was studied.Keywords: EAFD, ammonia, leaching, zinc, electroextraction
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