This study investigated the segregation behaviour of the phosphorus rich (P-rich) phase from the iron-rich (Fe-rich) phase in steelmaking slag from laboratory to industrial scale using computational fluid dynamics (CFD) in order to propose a suitable separation practice for the P-rich phase. Crucible experiments and corresponding CFD simulations using enthalpy-porosity approach were first performed to verify the concentration difference of phosphorus in the two phases. Both simulation and experimental results showed ~ 17 to 18 pct increase in phosphorus concentration in the top region of the crucible after solidification. The simulations were then scaled up to an industrial slag pot and slag pit. Reasonable agreement was obtained with published results for phosphorus concentration, and the total liquid amount in the 16-tonne slag pot, under practical cooling conditions. Simulations in the 30-tonne slag pit with in-ground insulation showed an increase of ~ 25 pct of the P-rich phase in the top region (while concentrating the Fe-rich phase in the bottom region). Differential concentration of the P-rich phase within the slag (as a result of heat transfer, micro/macro-segregation) suggested that separation of phosphorus in industrial scale slag pot and slag pit—as batch systems—is possible. Suggestions for separation in continuous operation are also discussed.

本研究使用计算流体动力学 (CFD) 从实验室到工业规模研究了炼钢渣中富磷 (P-rich) 相与富铁 (Fe-rich) 相的偏析行为，以提出合适的分离实践。为富P相。首先使用焓-孔隙率方法进行坩埚实验和相应的 CFD 模拟，以验证两相中磷的浓度差异。模拟和实验结果都表明，凝固后坩埚顶部区域的磷浓度增加了约 17 至 18%。然后将模拟放大到工业渣罐和渣坑。与公布的磷浓度结果和 16 吨渣罐中的总液体量取得了合理的一致，在实际冷却条件下。在具有地下绝缘层的 30 吨渣坑中进行的模拟显示，顶部区域的富 P 相增加了约 25%（同时将富铁相集中在底部区域）。渣中富磷相的不同浓度（作为传热、微观/宏观分离的结果）表明，在工业规模的渣罐和渣坑（作为间歇系统）中分离磷是可能的。还讨论了在连续操作中分离的建议。micro/macro-segregation) 表明在工业规模的渣罐和渣坑中分离磷（作为间歇系统）是可能的。还讨论了在连续操作中分离的建议。micro/macro-segregation) 表明在工业规模的渣罐和渣坑中分离磷（作为间歇系统）是可能的。还讨论了在连续操作中分离的建议。