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Article

Investigation of Possible Leaching Control Mechanisms for Chromium and Vanadium in Electric Arc Furnace (EAF) Slags Using Combined Experimental and Modeling Approaches

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Chair of Waste Processing and Waste Management, Montanuniversitaet Leoben, Franz-Josef-Straße 18, 8700 Leoben, Austria
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Energy Research Centre of the Netherlands (ECN) part of TNO, Westerduinweg 3, 1755 ZG Petten, The Netherlands
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Netherlands Organisation for Applied Scientific Research (TNO) Geological Survey of the Netherlands, Princetonlaan 6, 3584 CB Utrecht, The Netherlands
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Hans van der Sloot Consultancy, Glenn Millerhof 29, 1628 TS Hoorn, The Netherlands
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FEhS Building Materials Institute, Bliersheimer Straße 62, 47229 Duisburg, Germany
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Max Aicher Umwelt GmbH, Industriestraße 1, 86405 Meitingen, Germany
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Stahl- und Walzwerk Marienhuette GmbH, Südbahnstraße 11, 8021 Graz, Austria
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Chair of Resource Mineralogy, Montanuniversitaet Leoben, Peter-Tunner-Straße 5, 8700 Leoben, Austria
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Author to whom correspondence should be addressed.
Minerals 2019, 9(9), 525; https://doi.org/10.3390/min9090525
Received: 31 July 2019 / Revised: 24 August 2019 / Accepted: 27 August 2019 / Published: 30 August 2019
(This article belongs to the Special Issue Metallurgical Slags)
In this study, possible leaching control mechanisms for Cr and V in electric arc furnace slags were investigated by using a multi-methodological approach. Aside from chemical and mineralogical bulk analyses, special emphasis was given to surface investigations of the slags prior to and after leaching. In addition, pH dependence leaching tests were performed and the obtained data were evaluated with hydrogeochemical models. Investigations revealed that Cr and V are mainly bound in spinel and wuestite as well as minor amounts of olivine. Spinel and wuestite do not dissolve during water leaching for 48 h, whereas, depending on the composition of olivine, this phase either dissolves and releases V and Cr congruently, or does not dissolve but may hydrate. Melilite may also hydrate, but neither V nor Cr were detected in this phase. It appears that leached V is subsequently adsorbed onto these newly hydrated phases. The combination of the applied methods further showed that the abundance of calcium silicates, spinel, and wuestite is influenced by the FeO/SiO2 and CaO/SiO2 ratio in the slag. Therefore, it is assumed that the leaching of V and Cr can be minimized by changing these ratios to favor the formation of Fe bearing calcium silicate and spinel instead of wuestite. View Full-Text
Keywords: electric arc furnace slag; mineralogical characterization; leaching mechanism; vanadium; chromium; geochemical modeling electric arc furnace slag; mineralogical characterization; leaching mechanism; vanadium; chromium; geochemical modeling
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MDPI and ACS Style

Neuhold, S.; van Zomeren, A.; Dijkstra, J.J.; van der Sloot, H.A.; Drissen, P.; Algermissen, D.; Mudersbach, D.; Schüler, S.; Griessacher, T.; Raith, J.G.; Pomberger, R.; Vollprecht, D. Investigation of Possible Leaching Control Mechanisms for Chromium and Vanadium in Electric Arc Furnace (EAF) Slags Using Combined Experimental and Modeling Approaches. Minerals 2019, 9, 525. https://doi.org/10.3390/min9090525

AMA Style

Neuhold S, van Zomeren A, Dijkstra JJ, van der Sloot HA, Drissen P, Algermissen D, Mudersbach D, Schüler S, Griessacher T, Raith JG, Pomberger R, Vollprecht D. Investigation of Possible Leaching Control Mechanisms for Chromium and Vanadium in Electric Arc Furnace (EAF) Slags Using Combined Experimental and Modeling Approaches. Minerals. 2019; 9(9):525. https://doi.org/10.3390/min9090525

Chicago/Turabian Style

Neuhold, Simone, André van Zomeren, Joris J. Dijkstra, Hans A. van der Sloot, Peter Drissen, David Algermissen, Dirk Mudersbach, Susanne Schüler, Thomas Griessacher, Johann G. Raith, Roland Pomberger, and Daniel Vollprecht. 2019. "Investigation of Possible Leaching Control Mechanisms for Chromium and Vanadium in Electric Arc Furnace (EAF) Slags Using Combined Experimental and Modeling Approaches" Minerals 9, no. 9: 525. https://doi.org/10.3390/min9090525

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