To understand the effect of CaCl₂ addition on the dephosphorization ability of steelmaking slags, laboratory experiments were carried out to study the phosphorus distribution between CaO–SiO₂–FeO_x–P₂O₅–CaCl₂ slags and carbon-saturated iron at steelmaking temperature. The phosphorus distribution ratio between slag and pure iron foil (\( L_{\text{P}}^{{{\text{Fe-}}\gamma }} \)) was measured by equilibrium experiments and converted into the phosphorus distribution ratio between slag and carbon-saturated iron (\( L_{\text{P}}^{{\text{Fe}}{-}{\text{C}}} \)) using thermodynamic calculations. The influential mechanism of CaCl₂ was also discussed based on the phases in the slags. It was found that the addition of CaCl₂ is beneficial for the improvement of \( L_{\text{P}}^{{{\text{Fe}}{-}{\text{C}}}} \). In the slag with basicity (R = [w(CaO)/w(SiO₂)]) of 1.0, the P content in the liquid slag was increased by the addition of CaCl₂. When the basicity is sufficiently high (e.g., R≥1.5), the addition of CaCl₂ enhances the generation of P-rich solid phases, including both 2CaO·SiO₂–3CaO·P₂O₅ (C₂S–C₃P) and Ca₅Cl(PO₄)₃. Compared with CaCl₂-free slags, CaCl₂ addition in BOF slags doesn’t evidently change the effects of slag basicity and FeO_x content. With the increase of slag basicity (1.0 to 2.0), the amount of C₂S–C₃P solid solution in the slag climbs obviously, resulting in a higher \( L_{\text{P}}^{{{\text{Fe}}{-}{\text{C}}}} \) both in CaCl₂-added slags and CaCl₂-free slags, while \( L_{\text{P}}^{{{\text{Fe}}{-}{\text{C}}}} \) increases first and then decreases when the FeO_x content varies from 15 to 35 pct in this study.

为了解CaCl ₂添加对炼钢渣脱磷能力的影响，通过室内实验研究了CaO-SiO ₂ -FeO _x -P ₂ O ₅ -CaCl ₂渣与碳饱和铁在炼钢过程中的磷分布温度。炉渣与纯铁箔之间的磷分布比（\( L_{\text{P}}^{{{\text{Fe-}}\gamma }} \)）通过平衡实验测量并转化为磷分布炉渣和碳饱和铁之间的比率（\( L_{\text{P}}^{{\text{Fe}}{-}{\text{C}}} \)）使用热力学计算。CaCl的影响机制₂还基于炉渣中的相进行了讨论。发现加入CaCl ₂有利于\( L_{\text{P}}^{{{\text{Fe}}{-}{\text{C}}}} \)的提高。在碱度( R  = [ w (CaO)/ w (SiO ₂ )]) 为1.0 的炉渣中，通过添加CaCl ₂提高了液态炉渣中P 的含量。当碱度足够高（例如，- [R ≥1.5），添加氯化钙的₂增强P-富固体相的产生，包括2CaO·的SiO ₂ -3CaO·P ₂ ø ₅（C ₂S–C ₃ P) 和 Ca ₅ Cl(PO ₄ ) ₃。与不含CaCl _{2 的}炉渣相比，转炉炉渣中CaCl _{2 的}添加并未明显改变炉渣碱度和FeO _x含量的影响。随着炉渣碱度的增加（1.0～2.0），炉渣中C ₂ S-C ₃ P固溶体量明显增加，导致\( L_{\text{P}}^{{{\text {Fe}}{-}{\text{C}}}} \)在添加 CaCl _{2 的}渣和不含 CaCl _{2 的}渣中，而\( L_{\text{P}}^{{{\text{ Fe}}{-}{\text{C}}}} \)先增加后减少，当 FeO _x 在这项研究中，内容从 15 到 35 pct 不等。