A Study on the Reduction Behavior of Molten EAF Slag

作者：Kim Ju Hun; Joo Seong Woong; Kim Dong Jim; Kim Soo Young; Hwang Jin Il; Lee Hyung Chul; You Byung Don^*

来源：Journal of Korean Institute of Metals and Materials, 2014, 52(10): 791-798.

DOI：10.3365/KJMM.2014.52.10.791

• oxides
• recycling
• melting
• X-ray diffraction
• slag
• off-gas analysis

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 degrees C) 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.

• 出版日期2014-10