Abstract
Significant amounts of electric arc furnace dust originating from steel production are recycled every year by the Waelz process, despite the fact that this type of process has several disadvantages. One alternative method would be the recovery of very high-quality ZnO as well as iron and even chromium in the two-step dust recycling process, which was invented to treat special waste for the recovery of heavy metal-containing residues. The big advantage of that process is that various types of residues, especially dusts, can be treated in an oxidizing first step for cleaning, with a subsequent reducing step for the metal recovery. After the treatment, three different fractions—dust, slag, and an iron alloy, can be used without any limitations. This study focuses on the development of the process along with some thermodynamic considerations. Moreover, a final overview of mass balances of an experiment performed in a 100-kg top blowing rotary converter with further developments is provided.
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Acknowledgements
This work has been funded by the Austrian Federal Ministry of Science, Research and Economy. Additionally, the authors would like to thank the whole team of the Christian Doppler Laboratory for Optimization and Biomass Utilization in Heavy Metal Recycling at the Chair of Nonferrous Metallurgy at the Montanuniversitaet Leoben, Austria. Finally, the authors wish to thank Mr. Manuel Leuchtenmüller for supplying the artwork.
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Rösler, G., Pichler, C., Antrekowitsch, J. et al. “2sDR”: Process Development of a Sustainable Way to Recycle Steel Mill Dusts in the 21st Century. JOM 66, 1721–1729 (2014). https://doi.org/10.1007/s11837-014-1131-8
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DOI: https://doi.org/10.1007/s11837-014-1131-8