Tailoring the FeO/SiO<sub>2</sub> Ratio in Electric Arc Furnace Slags to Minimize the Leaching of Vanadium and Chromium
Based on recently published research on leaching control mechanisms in electric arc furnace (EAF) slags, it is assumed that a FeO/SiO<sub>2</sub> ratio of around one leads to low leached V and Cr concentrations. This ratio influences the mineral phase composition of the slag toward highe...
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MDPI AG
2020-04-01
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| author | Simone Neuhold David Algermissen Peter Drissen Burkart Adamczyk Peter Presoly Klaus P. Sedlazeck Johannes Schenk Johann G. Raith Roland Pomberger Daniel Vollprecht |
| author_facet | Simone Neuhold David Algermissen Peter Drissen Burkart Adamczyk Peter Presoly Klaus P. Sedlazeck Johannes Schenk Johann G. Raith Roland Pomberger Daniel Vollprecht |
| author_sort | Simone Neuhold |
| collection | DOAJ |
| description | Based on recently published research on leaching control mechanisms in electric arc furnace (EAF) slags, it is assumed that a FeO/SiO<sub>2</sub> ratio of around one leads to low leached V and Cr concentrations. This ratio influences the mineral phase composition of the slag toward higher amounts of spinel and a lower solubility of calcium silicate phases by suppressing the formation of magnesiowuestite and highly soluble calcium silicate phases. To evaluate this hypothesis, laboratory and scaled up tests in an EAF pilot plant were performed on slag samples characterized by elevated V and Cr leaching and a high FeO/SiO<sub>2</sub> ratio. Prior to the melting experiments, the optimum FeO/SiO<sub>2</sub> ratio was calculated via FactSage<sup>TM</sup>. In the melting experiments, the ratio was adjusted by adding quartz sand, which also decreased the basicity (CaO/SiO<sub>2</sub>) of the slag. As a reference, remelting experiments without quartz sand addition were conducted and additionally, the influence of the cooling rate of the slag was examined. The remelted (without quartz sand) and the remelted modified slags (with quartz sand) were analyzed chemically and mineralogically and the leaching behavior was investigated. The modification of the slags yielded a minimized release of V and Cr, supporting the hypothesis that the FeO/SiO<sub>2</sub> ratio influences the mineralogy and the leaching behavior. |
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| last_indexed | 2024-03-10T20:37:07Z |
| publishDate | 2020-04-01 |
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| spelling | doaj.art-bf37a50c0fcb4f7595662bc367cf26ff2023-11-19T20:58:57ZengMDPI AGApplied Sciences2076-34172020-04-01107254910.3390/app10072549Tailoring the FeO/SiO<sub>2</sub> Ratio in Electric Arc Furnace Slags to Minimize the Leaching of Vanadium and ChromiumSimone Neuhold0David Algermissen1Peter Drissen2Burkart Adamczyk3Peter Presoly4Klaus P. Sedlazeck5Johannes Schenk6Johann G. Raith7Roland Pomberger8Daniel Vollprecht9Waste Processing Technology and Waste Management, Montanuniversitaet Leoben, Franz-Josef-Straße 18, 8700 Leoben, AustriaFEhS Building Materials Institute, Bliersheimer Straße 62, 47229 Duisburg, GermanyFEhS Building Materials Institute, Bliersheimer Straße 62, 47229 Duisburg, GermanyFederal Institute for Materials Research and Testing, Richard-Willstätter-Straße 11, 12489 Berlin, GermanyFerrous Metallurgy, Montanuniversitaet Leoben, Franz-Josef-Straße 18, 8700 Leoben, AustriaWaste Processing Technology and Waste Management, Montanuniversitaet Leoben, Franz-Josef-Straße 18, 8700 Leoben, AustriaFerrous Metallurgy, Montanuniversitaet Leoben, Franz-Josef-Straße 18, 8700 Leoben, AustriaResource Mineralogy, Montanuniversitaet Leoben, Peter Tunner-Straße 5, 8700 Leoben, AustriaWaste Processing Technology and Waste Management, Montanuniversitaet Leoben, Franz-Josef-Straße 18, 8700 Leoben, AustriaWaste Processing Technology and Waste Management, Montanuniversitaet Leoben, Franz-Josef-Straße 18, 8700 Leoben, AustriaBased on recently published research on leaching control mechanisms in electric arc furnace (EAF) slags, it is assumed that a FeO/SiO<sub>2</sub> ratio of around one leads to low leached V and Cr concentrations. This ratio influences the mineral phase composition of the slag toward higher amounts of spinel and a lower solubility of calcium silicate phases by suppressing the formation of magnesiowuestite and highly soluble calcium silicate phases. To evaluate this hypothesis, laboratory and scaled up tests in an EAF pilot plant were performed on slag samples characterized by elevated V and Cr leaching and a high FeO/SiO<sub>2</sub> ratio. Prior to the melting experiments, the optimum FeO/SiO<sub>2</sub> ratio was calculated via FactSage<sup>TM</sup>. In the melting experiments, the ratio was adjusted by adding quartz sand, which also decreased the basicity (CaO/SiO<sub>2</sub>) of the slag. As a reference, remelting experiments without quartz sand addition were conducted and additionally, the influence of the cooling rate of the slag was examined. The remelted (without quartz sand) and the remelted modified slags (with quartz sand) were analyzed chemically and mineralogically and the leaching behavior was investigated. The modification of the slags yielded a minimized release of V and Cr, supporting the hypothesis that the FeO/SiO<sub>2</sub> ratio influences the mineralogy and the leaching behavior.https://www.mdpi.com/2076-3417/10/7/2549electric arc furnace (EAF) slagsFactSage<sup>TM</sup> calculationsleaching control mechanismsmelting experimentsquartz sand |
| spellingShingle | Simone Neuhold David Algermissen Peter Drissen Burkart Adamczyk Peter Presoly Klaus P. Sedlazeck Johannes Schenk Johann G. Raith Roland Pomberger Daniel Vollprecht Tailoring the FeO/SiO<sub>2</sub> Ratio in Electric Arc Furnace Slags to Minimize the Leaching of Vanadium and Chromium Applied Sciences electric arc furnace (EAF) slags FactSage<sup>TM</sup> calculations leaching control mechanisms melting experiments quartz sand |
| title | Tailoring the FeO/SiO<sub>2</sub> Ratio in Electric Arc Furnace Slags to Minimize the Leaching of Vanadium and Chromium |
| title_full | Tailoring the FeO/SiO<sub>2</sub> Ratio in Electric Arc Furnace Slags to Minimize the Leaching of Vanadium and Chromium |
| title_fullStr | Tailoring the FeO/SiO<sub>2</sub> Ratio in Electric Arc Furnace Slags to Minimize the Leaching of Vanadium and Chromium |
| title_full_unstemmed | Tailoring the FeO/SiO<sub>2</sub> Ratio in Electric Arc Furnace Slags to Minimize the Leaching of Vanadium and Chromium |
| title_short | Tailoring the FeO/SiO<sub>2</sub> Ratio in Electric Arc Furnace Slags to Minimize the Leaching of Vanadium and Chromium |
| title_sort | tailoring the feo sio sub 2 sub ratio in electric arc furnace slags to minimize the leaching of vanadium and chromium |
| topic | electric arc furnace (EAF) slags FactSage<sup>TM</sup> calculations leaching control mechanisms melting experiments quartz sand |
| url | https://www.mdpi.com/2076-3417/10/7/2549 |
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