ABSTRACT

In order to enable the steel companies to achieve carbon peaks and carbon neutrality, the f-CaO content in steel slag should be reduced. For this reason, this study investigates the interface reaction evolution of the quicklime and different slag in the ‘iron’ slagging route of the CaO-FetO-SiO₂-MgO system at the converter steelmaking temperature. The microstructure of the reaction interface was observed by an electron microscope. The results showed that the interface reaction formed CaO-FeO solid solution, (Ca, Mg) olivine phase, and 2CaO·SiO₂. The change in thickness of CaO-FeO and (Ca, Mg) olivine shows a clear trend with the change in slag components.Therefore, the dissolution mechanism of quicklime in the slag was discussed, and the liquid phase mass transfer coefficients in different slags were obtained. The results will provide a theoretical basis for the faster dissolution of lime in slag and reduction of f-CaO content in slag.

摘要

为使钢铁企业实现碳达峰和碳中和，应降低钢渣中的f-CaO含量。为此，本研究考察了转炉炼钢温度下CaO-FetO-SiO _{2 -MgO体系“铁”排渣路线中生石灰与不同炉渣的界面反应演变。}通过电子显微镜观察反应界面的微观结构。结果表明，界面反应形成CaO-FeO固溶体、(Ca, Mg)橄榄石相和2CaO·SiO ₂. CaO-FeO和(Ca,Mg)橄榄石的厚度随着炉渣成分的变化呈现出明显的变化趋势。因此，探讨了生石灰在炉渣中的溶解机理，得到了不同炉渣中的液相传质系数获得。研究结果将为石灰在渣中更快溶解和降低渣中f-CaO含量提供理论依据。