Alkaline leaching of zinc from electric arc furnace steel dust |
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| Affiliation: | 1. Ceramics and Refractories Technological Development Company, CERECO S.A., 72nd km Athens Lamia National Road, P.O. Box 18646, GR 34100 Chalkida, Greece;2. General Department of Applied Sciences, School of Technological Applications, Technological Educational Institute of Sterea Ellada, GR 34400 Psahna, Greece;1. National Research Centre, Ceramics Department, El Buhouth St., 12622 Dokki, Cairo, Egypt;2. Department of Metallurgical and Materials Engineering, Faculty of Petroleum and Mining Engineering, Suez University, P.O. Box 43721, Suez, Egypt;1. Chemical Engineering Department, Jordan University of Science and Technology, Irbid 22110, Jordan;2. Faculty of Engineering, University of Nottingham, Nottingham NG7-2RD, UK;3. Department of Environmental Engineering, Al-Hussein Bin Talal University, Maan 71111, Jordan;1. Energy Safety Research Institute, Swansea University Bay Campus, Swansea, SA1 8EN, UK;2. Department of Chemistry and Department of Materials Science and Nanoengineerging, Rice University, Houston, Texas, 77005, USA;3. Environmental Engineering Programme Area, Faculty of Engineering, Universiti Teknologi Brunei, Brunei Darussalam;1. Chemical Engineering Department, Jordan University of Science and Technology, Irbid, 22110, Jordan;2. United Arab Emirates University, Department of Chemical and Petroleum Engineering, 17 Sheikh Khalifa bin Zayed Street, Al-Ain, 15551, United Arab Emirates;3. Faculty of Engineering, University of Nottingham, Nottingham, NG7-2RD, UK |
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| Abstract: | Electric arc furnaces (EAF) generate about 10–20 kg of dust per metric ton of steel, which constitute a hazardous waste, known as EAF dust. This dust contains a remarkable amount of non-ferrous metals, which include zinc, cadmium, lead, chromium and nickel that could be recovered, reducing the environmental impact of the leachable toxic metals, and generating revenue. In this paper, different alkaline leaching techniques were tested in order to dissolve the zinc present in an EAF dust: (i) conventional agitation leaching; (ii) pressure leaching; (iii) conventional leaching following a microwave pretreatment and (iv) leaching with agitation provided by an ultra-sonic probe. Temperature and sodium hydroxide concentration were the variables tested. The highest zinc recovery from the EAF dust, containing about 12% of zinc, was about 74%. This was achieved after 4 h of leaching in a temperature of 90 °C and with a sodium hydroxide concentration of 6 M of the leaching agent. |
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