ABSTRACT

CONARC^® steelmaking process which combines the basic oxygen and electric arc furnace steelmaking, requires precise operation and control of slag chemistry within an optimum range to reduce the refractory wear. The target slag should be MgO saturated, containing solid particles of magnesium wustite which ensures good foamy slag and causes less erosion of MgO-C refractory. In this present study, FactSage™ software was utilized to study and visualize the MgO saturation of slag through MgO-SiO₂-FeO-CaO-Al₂O₃-MnO and CaO-SiO₂-FeO-MgO-Al₂O₃-MnO systems. The ternary phase diagrams revealed, the slag was MgO-under saturated based on the current pattern of calcined lime and dolomite addition during the process. Based on the findings of this study, the addition pattern were altered to bring the slag regime within the MgO saturation level with good slag basicity. This change showed significant improvement in reducing the erosion rate of MgO-C lining in furnace and thereby reducing the specific gunning mass requirement.

摘要

CONARC ^®炼钢工艺结合了碱性氧气和电弧炉炼钢，需要精确操作并将炉渣化学成分控制在最佳范围内，以减少耐火材料的磨损。目标渣应是MgO饱和的，含有镁维氏体固体颗粒，以保证良好的泡沫渣并减少对MgO-C耐火材料的侵蚀。_{在本研究中，利用 FactSage™ 软件通过 MgO-SiO 2} -FeO-CaO-Al ₂ O ₃ -MnO 和 CaO-SiO ₂ -FeO-MgO-Al ₂ O ₃来研究和可视化炉渣的 MgO 饱和度-MnO系统。三元相图显示，根据当前工艺过程中添加的生石灰和白云石的模式，炉渣是 MgO 饱和状态。根据本研究的结果，改变了添加模式，使炉渣状态处于 MgO 饱和水平内，并具有良好的炉渣碱度。这一变化在降低炉内 MgO-C 衬里的侵蚀率方面取得了显着的进步，从而降低了特定的喷补质量要求。