精炼渣与高锰高铝钢液的相互作用

摘要：为了研究精炼渣与高锰高铝钢液相互作用规律，以CaO-5%SiO2-Al2O3-8%MgO精炼渣与Fe-15Mn-10Al-0.7C高锰高铝钢液在1600℃的渣金反应为研究对象，分别在渣金反应5、15、30、60和90min时取钢样和渣样，通过钢液和渣成分变化进行了渣金反应动力学计算。结果表明：整个渣金反应过程中，钢液中［Al］和渣中SiO2不断降低、渣中Al2O3不断增加；精炼渣与高锰高铝钢液反应前期限制性环节为［Al］在边界层的传质，反应后期渣成分发生改变、黏度升高以及渣中固相颗粒形成，使得SiO2在渣中的传质条件恶化，SiO2向反应界面的传质成为渣金反应的速率限制环节；精炼渣与高锰高铝钢反应分3个阶段：初期反应剧烈、中期渣金界面形成尖晶石层并阻碍渣金反应、后期反应趋于稳定。

Interaction between refining slag and high manganese and high aluminum molten steel

In order to study the interaction between refining slag and high-manganese and high aluminum molten steel, a steel-slag reaction experiment between CaO-5%SiO2-Al2O3-8%MgO refining slag and Fe-15Mn-10Al-0.7C molten steel at 1600℃ was performed. Steel and slag samples were taken and analyzed when the slag metal reaction time was 5, 15, 30, 60 and 90min respectively. In addition, the steel slag reaction kinetics was calculated based on laboratory experiment. The results show that the ［Al］ content in molten steel and (SiO2) content in slag decrease, while (Al2O3) increases during steel slag reaction. The mass transfer of ［Al］ in the boundary layer is the controlled process in the early stage of the reaction. As the reaction proceeds, the composition and viscosity of slag obviously change, accompanied by the formation of solid parcitles,which makes the mass transfer of (SiO2) to the reaction interface becoming the limited step. In summary, the interaction between refining slag and steel can be concluded to three stages: (1) Violent reaction during the initial stage; (2) The formation of spinel layer at the slag metal interface;(3) Stable reaction stage.