矿石中有害元素硫在转炉冶炼过程的迁移行为

Migration Behavior of Harmful Elements Sulfur in Ore during Converter Smelting Process

本文采用扫描电镜和能谱(SEM/EDS)、X射线光电子能谱(XPS)、Factsage热力学软件、高温热态试验等手段研究了矿石A中含硫物相在炼钢条件下的迁移行为,为矿石在转炉冶炼过程合理的利用提供指导。结果表明,高硫矿石A中硫元素以BaSO,形式存在,尺寸可达到数百微米,形状多不规则;在高温条件下,以BaS0,形式存在的硫元素转变为单质硫进入钢中而导致钢液增硫;无渣条件下,矿石的加入量每增加10kg/t钢,钢液增硫90×10^-6;转妒吹炼过程中采用矿石A作为冷却剂和造渣辅料时,合理的加入量应控制在吨钢15kg以下,当矿石加入量超过吨钢15kg时,钢液终点硫含量增加趋势明显加快。

This paper focuses on the migration behavior of sulfur in ore during converter smelting process using different methods including scanning electron microscope and energy spectrum(SEM/EDS),X ray photoelectron spectroscopy(XPS),Factsage thermodynamic software and hot crucible experiments,which provide guidance for the application of ore′A′in basic oxygen furnace(BOF)process.Results showed that the sulfur in ore′A′existed in the form of BaSO,with hundreds of microns and irregular shapes,which resulted in sulfur picking up after transformation from the form of BaSO,to element sulfur under high temperature condition.The addition of 10kg ore per ton molten steel results in the sulfur increment of 90×10^6 under no slagging condition.A proper amount should be controlled within 15 kg per ton using ore′A′as coolant and slagging materials during BOF process.The increment of sulfur in molten steel is not obvious when the weight ratio of ore and molten steel is below 1.5.If it exceeds 1.5,the sulfur content of liquid steel increased significantly as increasing of ore.