The dephosphorization process for producing stainless steel hot metal is divided into desiliconization period and dephosphorization period, and the ability to contain phosphorus in the slag is important for the dephosphorization effect of hot metal. The phase structure of the slags during the desiliconization and dephosphorization phases is studied by X‐ray diffraction (XRD), petrographic analysis, and scanning electron microscopy (SEM). The ability of slag to contain phosphorus during the slagging process of calcium ferrite is discussed. The final slag petrographic composition in the desiliconization stage is mainly free calcium oxide, dicalcium silicate and calcium phosphate solid solution, RO phase, calcium ferrite and metallic iron. The final slag petrographic composition in the dephosphorization phase is mainly composed of tricalcium silicate, dicalcium silicate and calcium phosphate solid solution, RO phase, dicalcium ferrite and free calcium oxide. Compared with the desiliconization phase, the crystal phase obtained during the dephosphorization phase is more stable. The terminal ferrous slag phosphorus in calcium ferrite slag system mainly exists in the form of 2CaO⋅SiO₂−3CaO⋅P₂O₅ solid solution, whereas the content in other phases is small.

中文翻译：

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不锈钢生产中铁水脱磷渣中磷的存在研究

生产不锈钢铁水的脱磷工艺分为脱硅期和脱磷期，炉渣中的磷含量对铁水的脱磷效果很重要。通过X射线衍射（XRD），岩相分析和扫描电子显微镜（SEM）研究了脱硅和脱磷阶段炉渣的相结构。讨论了渣在铁氧体钙结渣过程中的含磷能力。脱硅阶段的最终矿渣岩石学组成主要是游离氧化钙，硅酸二钙和磷酸钙固溶体，RO相，铁素体钙和金属铁。脱磷阶段的最终矿渣岩石学组成主要由硅酸三钙组成，硅酸二钙和磷酸钙固溶体，RO相，铁酸二钙和游离氧化钙。与脱硅相相比，在脱磷相中获得的晶体相更稳定。铁酸钙渣系统中的末端铁渣磷主要以2CaO·SiO的形式存在₂ -3CaO·P ₂ O ₅固溶体，其他相的含量少。