To explore the influence of Al ₂ O ₃ /TiO ₂ /Na ₂ O on the mineralogical structure and phosphorus enrichment of converter slag, phosphorus enrichment and distribution in the CaO–SiO ₂ –Fe ₂ O ₃ –MgO–Al ₂ O ₃ /TiO ₂ /Na ₂ O slag system were experimentally examined. The results show that phosphorus mainly exists in an n2CaO SiO ₂ –3CaO P ₂ O ₅ (nC ₂ S–C ₃ P) solid solution. Al ₂ O ₃ /TiO ₂ /Na ₂ O is beneficial for phosphorus enrichment in the CaO–SiO ₂ –Fe ₂ O ₃ –MgO slag system to various degrees. This allows screening and separation of the enriched phase in the slag. When Al ₂ O ₃ content was increased from 0 to 15%, the P ₂ O ₅ content in the P-rich phase increased from 13.88 to 21.32%, and the area of the P-rich phase decreased from 57.50 to 37.87%. When the TiO ₂ content was increased from 0 to 10%, the content of P2O5 in the P-rich phase increased from 13.88 to 22.90%, and the area of the P-rich phase decreased from 57.50 to 39.20%. When the contents of Al ₂ O ₃ and TiO ₂ were increased, the previously formed nC ₂ S–C ₃ P solid solution transformed into n0C ₂ S–C ₃ P (n\ n0) with higher phosphorus content. Na ₂ O had no significant effect on phosphorus enrichment, but exerted significant influence on the area of the P-rich phase. When the Na ₂ O content was increased from 0 to 8%, the previously formed nC ₂ S–C ₃ P solid solution gradually became Na ₂ Ca ₄ (PO ₄ ) ₂ SiO ₄ , and the area of the P-rich phase increased from 57.50 to 68.50%. With increasing the content of ATN (a mixture with a mass ratio of Al ₂ O ₃/TiO ₂ /Na ₂ O = 15:4:3) from 0 to 30%, the content of P ₂ O ₅ increased from 13.88 to 42.10% and the area of the P-rich phase decreased from 54.92 to 18.40%.

To explore the influence of Al ₂ O ₃ /TiO ₂ /Na ₂ O on the mineralogical structure and phosphorus enrichment of converter slag, phosphorus enrichment and distribution in the CaO–SiO ₂ –Fe ₂ O ₃ –MgO–Al ₂ O ₃ /TiO ₂ /Na ₂ O slag system were experimentally examined. The results show that phosphorus mainly exists in an n2CaO SiO ₂ –3CaO P ₂ O ₅ (nC ₂ S–C ₃ P) solid solution. Al ₂ O ₃ /TiO ₂ /Na ₂ O is beneficial for phosphorus enrichment in the CaO–SiO ₂ –Fe ₂ O ₃ –MgO slag system to various degrees. This allows screening and separation of the enriched phase in the slag. When Al ₂ O ₃ content was increased from 0 to 15%, the P ₂ O ₅ content in the P-rich phase increased from 13.88 to 21.32%, and the area of the P-rich phase decreased from 57.50 to 37.87%. When the TiO ₂ content was increased from 0 to 10%, the content of P2O5 in the P-rich phase increased from 13.88 to 22.90%, and the area of the P-rich phase decreased from 57.50 to 39.20%. When the contents of Al ₂ O ₃ and TiO ₂ were increased, the previously formed nC ₂ S–C ₃ P solid solution transformed into n0C ₂ S–C ₃ P (n\ n0) with higher phosphorus content. Na ₂ O had no significant effect on phosphorus enrichment, but exerted significant influence on the area of the P-rich phase. When the Na ₂ O content was increased from 0 to 8%, the previously formed nC ₂ S–C ₃ P solid solution gradually became Na ₂ Ca ₄ (PO ₄ ) ₂ SiO ₄ , and the area of the P-rich phase increased from 57.50 to 68.50%. With increasing the content of ATN (a mixture with a mass ratio of Al ₂ O ₃/TiO ₂ /Na ₂ O = 15:4:3) from 0 to 30%, the content of P ₂ O ₅ increased from 13.88 to 42.10% and the area of the P-rich phase decreased from 54.92 to 18.40%.