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Vol.52, No.10, 791 ~ 799, 2014
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| Title |
| A Study on the Reduction Behavior of Molten EAF Slag |
| 김주훈 Ju Hun Kim , 주성웅 Seong Woong Joo , 김동준 Dong Jun Kim , 김수영 Soo Young Kim , 황진일 Jin Il Hwang , 이형철 Hyung Chul Lee , 유병돈 Byung Don You |
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| Abstract |
| The reduction behavior of molten electric arc furnace (EAF) slag containing (FeO), (MnO) and (P2O5) was investigated using graphite as a reductant. Reaction temperature (1400-1600 ℃) and slag basicity (0.5-2.0) were varied during the experiment. Alumina and magnesia crucibles were used to observe the effect of refractory on the reduction behavior of the molten EAF slag. When an alumina crucible was used, (Al2O3) content in the slag increased significantly by its elution from the crucible. The content of poorly reducible oxides, (CaO), (MgO), and (SiO2), maintained an almost constant level regardless of the reaction temperature, because the increase of (Al2O3) and the decrease in reducible oxides (FeO, MnO, P2O5 etc.) offset one another. The reduction degree of reducible oxides evaluated through chemical composition analysis agreed well with that calculated by off-gas analysis. The reduction degree increased with an increase in the reaction temperature and the slag basicity. The reduction degree in the magnesia crucible was higher than that in the alumina crucible at identical conditions. When a magnesia crucible was used, the reduction reaction was more promoted due to the enhancement of the activity of (FeO) and (MnO), compared to the alumina crucible. |
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| Key Words |
| oxides, recycling, melting, X-ray diffraction, slag, off-gas analysis |
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