STUDIES ON THE REDUCTIVE ROASTING OF ZINC AND IRON CONTAINING STEELMAKING DUST
Abstract
Steelmaking dust generated in electric arc furnaces represents a significant technogenic resource containing valuable metals such as iron and zinc. At the same time, improper disposal of this dust poses a serious environmental hazard. This study examines the feasibility of processing zinc-containing steelmaking dust by means of reductive roasting using petroleum coke as a reducing agent. The chemical composition of the dust collected from the gas-cleaning system of the electric steelmaking shop of JSC «Uzmetkombinat» was analyzed. Experimental investigations were carried out at temperatures up to 1200 °C with varying contents of the reducing agent (40–90 wt.% relative to the dust mass). The degree of zinc volatilization and the behavior of iron oxide reduction were evaluated using atomic absorption spectroscopy. The results demonstrate that increasing the coke content to 80–90 wt.% ensures zinc removal exceeding 50% and almost complete reduction of iron oxides to the metallic state. The resulting solid product (clinker) can be directly utilized in steelmaking processes, while zinc is concentrated in the vapor phase. The proposed technology is environmentally and economically viable and can be implemented using existing Waelz-type equipment for processing.
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List of references
Habashi F. Principles of Extractive Metallurgy. Volume 2: Hydrometallurgy. Gordon and Breach Science Publishers, New York, 1983.
Turkdoğan E.T. Physical Chemistry of High-Temperature Processes. Academic Press, New York, 1980.
Frukhan R.J. Steel Production, Molding, and Processing: Steel Melting and Refining. AISE Steel Foundation, Pittsburgh, 1998.
Pickles K.A. Thermodynamic analysis of selective reduction of electric arc furnace dust. Journal of Hazardous Materials, 2010, 166, pp. 1030-1042.
Oustadakis P., Tsakiridis P.E., Katsiapi A., Agatzini-Leonardou S. The hydrometallurgical process of extracting zinc from the dust of an electric arc furnace. Journal of Hazardous Materials, 2010, 179, pp. 1-7.
Hagelstein C. The Wels process for processing zinc-containing residues. Lead-Zinc 2000, TMS, Warrendale, 2000, pp. 493-506.
Suetens T., Guo M., Blanpain B. Mechanisms of reactions in the carbothermic reduction of zinc oxide in metallurgical waste. Metallurgical and Materials Transactions B, 2015, 46, pp. 123-134.
Antrekovich J., Steinlechner S., Unger A. Extraction of zinc from metallurgical waste by high-temperature processes. Minerals Engineering, 2016, 89, pp. 27-36.
Zhang Y., Li H., Wang X. Carbothermal behavior ZnFe2O4 in electrodeox furnace dust. Thermochimica Acta, 2014, 579, pp. 1-7.
Gezennek A.G., Huber J.K., Patisson F. Dust formation in an electric arc furnace: the birth of particles. Technology of Powders, 2005, 157, pp. 2-11.
Brookard W.J., Davey C.J., Rodopoulos T. The behavior of zinc in the smelting of steel in an electric arc furnace. Enrichment of Mineral Resources, 2005, 18, pp. 205-214.
Piret N., Legu J.G. Zinc Evaporation in Carbothermal Processing of Steel Smelting Dust. Metallurgical Transactions B, 1992, 23, pp. 113-121.
Itō S., Asano K. Kinetics of reduction of zinc oxide by carbon monoxide gas. ISIJ International, 2001, 41, pp. 105-111.
Hwang J.J., Huang H., Zou Y.M. Reduction of zinc from electric arc furnace dust by heat treatment. Journal of Materials Science, 2008, 43, pp. 5935-5943.
Wang K., Sun T., Coo J. Thermodynamic analysis of zinc evaporation from electric arc furnace dust. Journal of Environmentally Clean Production, 2018, 172, pp. 151-160.
Li J., Zhuang X., Carol X. Ecological and resource aspects of electric arc furnace dust utilization. Resources, Preservation and Recycling, 2019, 143, pp. 75-88.
Alamova G.Kh., Rakhimov N.S., Djuraev Sh.Sh., Khojiev Sh.T. Kinetics of carbon-thermal reduction of magnetite. Student Bulletin, 2021, 8 (153), pp. 60-62.
Alamova G.Kh., Rakhimov N.S., Juraev Sh.Sh., Khojiev Sh.T. Reduction of volatile metal oxides. Student Bulletin, 2021, 8 (153), pp. 69-71.
Hojiyev S.T., Nuraliyev O.U., Berdiyarov B.T., Matkarimov S.T. Some thermodynamic aspects of magnetite reduction in the presence of carbon. Universum: Technical Sciences, 2021, 3 (84), pp. 60-64.
Karimjonov B.R., Berdiyarov B.T., Matkarimov S.T., Hojiyev Sh.T. Analysis of modern methods for processing zinc-containing steel dust. Proceedings of the International Scientific Conference, Bukhara, 2020, pp. 65-66.
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