Viscosity and Structural Investigation of High-Concentration Al<sub>2</sub>O<sub>3</sub> and MgO Slag System for FeO Reduction in Electric Arc Furnace Processing
In the present study, the viscosity of the CaO–SiO<sub>2</sub>–FeO–Al<sub>2</sub>O<sub>3</sub>–MgO slag system was measured for the recovery of FeO in the electric arc furnace (EAF) process using Al dross. Considering the MgO-saturated operational condition of the...
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MDPI AG
2021-07-01
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| author | Youngjae Kim Dong-Joon Min |
| author_facet | Youngjae Kim Dong-Joon Min |
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| description | In the present study, the viscosity of the CaO–SiO<sub>2</sub>–FeO–Al<sub>2</sub>O<sub>3</sub>–MgO slag system was measured for the recovery of FeO in the electric arc furnace (EAF) process using Al dross. Considering the MgO-saturated operational condition of the EAF, the viscosity was measured in the MgO-saturated composition at 1823 K with varying FeO and Al<sub>2</sub>O<sub>3</sub> concentrations. An increase in the slag viscosity with decreasing temperature was observed. The activation energy was evaluated, and the change in the thermodynamically equilibrated phase was considered. The changes in the aluminate structure with varying FeO and Al<sub>2</sub>O<sub>3</sub> concentrations were investigated by Fourier-transform infrared spectroscopy, which revealed an increase in the [AlO<sub>4</sub>] tetrahedral structure with increasing Al<sub>2</sub>O<sub>3</sub> concentration. Depolymerization of the aluminate structure was observed at higher FeO concentrations. The Raman spectra showed the polymerization of the silicate network structure at higher Al<sub>2</sub>O<sub>3</sub> concentrations. By associations between the silicate and aluminate structures, a more highly polymerized slag structure was achieved in the present system by increasing the Al<sub>2</sub>O<sub>3</sub> concentration. |
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| language | English |
| last_indexed | 2024-03-10T08:36:26Z |
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| spelling | doaj.art-ba7bc890a6e0475f8bbecc6df9e97f9a2023-11-22T08:40:28ZengMDPI AGMetals2075-47012021-07-01118116910.3390/met11081169Viscosity and Structural Investigation of High-Concentration Al<sub>2</sub>O<sub>3</sub> and MgO Slag System for FeO Reduction in Electric Arc Furnace ProcessingYoungjae Kim0Dong-Joon Min1Mineral Resource Research Division, Korea Institute of Geoscience and Mineral Resources, 124 Gwahak-ro, Yuseong-gu, Daejeon 34132, KoreaDepartment of Materials Science and Engineering, Yonsei University, Seoul 03722, KoreaIn the present study, the viscosity of the CaO–SiO<sub>2</sub>–FeO–Al<sub>2</sub>O<sub>3</sub>–MgO slag system was measured for the recovery of FeO in the electric arc furnace (EAF) process using Al dross. Considering the MgO-saturated operational condition of the EAF, the viscosity was measured in the MgO-saturated composition at 1823 K with varying FeO and Al<sub>2</sub>O<sub>3</sub> concentrations. An increase in the slag viscosity with decreasing temperature was observed. The activation energy was evaluated, and the change in the thermodynamically equilibrated phase was considered. The changes in the aluminate structure with varying FeO and Al<sub>2</sub>O<sub>3</sub> concentrations were investigated by Fourier-transform infrared spectroscopy, which revealed an increase in the [AlO<sub>4</sub>] tetrahedral structure with increasing Al<sub>2</sub>O<sub>3</sub> concentration. Depolymerization of the aluminate structure was observed at higher FeO concentrations. The Raman spectra showed the polymerization of the silicate network structure at higher Al<sub>2</sub>O<sub>3</sub> concentrations. By associations between the silicate and aluminate structures, a more highly polymerized slag structure was achieved in the present system by increasing the Al<sub>2</sub>O<sub>3</sub> concentration.https://www.mdpi.com/2075-4701/11/8/1169CaO–SiO<sub>2</sub>–FeO–Al<sub>2</sub>O<sub>3</sub>–MgO slag systemviscosityslag structuresilicate structurealuminate structureFeO recovery |
| spellingShingle | Youngjae Kim Dong-Joon Min Viscosity and Structural Investigation of High-Concentration Al<sub>2</sub>O<sub>3</sub> and MgO Slag System for FeO Reduction in Electric Arc Furnace Processing Metals CaO–SiO<sub>2</sub>–FeO–Al<sub>2</sub>O<sub>3</sub>–MgO slag system viscosity slag structure silicate structure aluminate structure FeO recovery |
| title | Viscosity and Structural Investigation of High-Concentration Al<sub>2</sub>O<sub>3</sub> and MgO Slag System for FeO Reduction in Electric Arc Furnace Processing |
| title_full | Viscosity and Structural Investigation of High-Concentration Al<sub>2</sub>O<sub>3</sub> and MgO Slag System for FeO Reduction in Electric Arc Furnace Processing |
| title_fullStr | Viscosity and Structural Investigation of High-Concentration Al<sub>2</sub>O<sub>3</sub> and MgO Slag System for FeO Reduction in Electric Arc Furnace Processing |
| title_full_unstemmed | Viscosity and Structural Investigation of High-Concentration Al<sub>2</sub>O<sub>3</sub> and MgO Slag System for FeO Reduction in Electric Arc Furnace Processing |
| title_short | Viscosity and Structural Investigation of High-Concentration Al<sub>2</sub>O<sub>3</sub> and MgO Slag System for FeO Reduction in Electric Arc Furnace Processing |
| title_sort | viscosity and structural investigation of high concentration al sub 2 sub o sub 3 sub and mgo slag system for feo reduction in electric arc furnace processing |
| topic | CaO–SiO<sub>2</sub>–FeO–Al<sub>2</sub>O<sub>3</sub>–MgO slag system viscosity slag structure silicate structure aluminate structure FeO recovery |
| url | https://www.mdpi.com/2075-4701/11/8/1169 |
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