Tailoring the FeO/SiO2 Ratio in Electric Arc Furnace Slags to Minimize the Leaching of Vanadium and Chromium
| Autor: | Roland Pomberger, Daniel Vollprecht, Johannes Schenk, Johann Raith, Peter Presoly, David Algermissen, Burkart Adamczyk, Klaus Philipp Sedlazeck, Peter Drissen, Simone Franziska Neuhold |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
FactSageTM calculations
Materials science 0211 other engineering and technologies Vanadium chemistry.chemical_element melting experiments 02 engineering and technology 010501 environmental sciences engineering.material lcsh:Technology 01 natural sciences lcsh:Chemistry Chromium chemistry.chemical_compound leaching control mechanisms General Materials Science lcsh:QH301-705.5 Instrumentation Quartz 021102 mining & metallurgy 0105 earth and related environmental sciences Electric arc furnace Fluid Flow and Transfer Processes lcsh:T Process Chemistry and Technology Metallurgy Spinel General Engineering quartz sand Slag lcsh:QC1-999 Computer Science Applications lcsh:Biology (General) lcsh:QD1-999 chemistry lcsh:TA1-2040 visual_art ddc:540 Calcium silicate engineering visual_art.visual_art_medium Leaching (metallurgy) lcsh:Engineering (General). Civil engineering (General) electric arc furnace (EAF) slags lcsh:Physics |
| Zdroj: | Applied Sciences Volume 10 Issue 7 Applied Sciences, Vol 10, Iss 2549, p 2549 (2020) |
| ISSN: | 2076-3417 |
| Popis: | Based on recently published research on leaching control mechanisms in electric arc furnace (EAF) slags, it is assumed that a FeO/SiO2 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/SiO2 ratio. Prior to the melting experiments, the optimum FeO/SiO2 ratio was calculated via FactSageTM. In the melting experiments, the ratio was adjusted by adding quartz sand, which also decreased the basicity (CaO/SiO2) 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/SiO2 ratio influences the mineralogy and the leaching behavior. |
| Databáze: | OpenAIRE |
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