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In order to recycle the phosphorus in P-bearing converter slag and make it used as slag phosphate fertilizer, the effect of MgO and MnO in P-bearing steelmaking slag on phosphorus existence form, P 2 O 5  solubility and magnetic separation behavior were researched systematically. The results show that the phosphorus in slag is mainly in the form of  n 2CaO · SiO 2 –3CaO · P 2 O 5  (for short  n C 2 S–C 3 P) solid solution in the P-rich phase for CaO-SiO 2 -Fe t O-P 2 O 5 -X (X stands for MgO and MnO, respectively). And the increasing of MgO and MnO content has no influence on precipitation of  n C 2 S–C 3 P solid solution in slag, MnO and MgO mainly enter into RO phase and base phase to form MnFe 2 O 4  and MgFe 2 O 4 , which has little effect on the P 2 O 5  content of P-rich phase, so which has little effect on the degree of phosphorus enrichment and phosphorus occurrence form of the P-bearing slag. And adding MgO and MnO into CaO-SiO 2 -P 2 O 5 -Fe 2 O 3  slag system can break the complex net structure formed by Si–O on certain degree, and also hinder the precipitation of β-Ca 3 (PO 4 ) 2  crystal with low citric acid solubility during the melting–cooling process. Therefore, adding appropriate MgO and MnO content into slag can improve the slag P 2 O 5  solubility, but the effect of different amounts of MgO and MnO on the P 2 O 5  solubility has little difference. Meanwhile, adding MgO and MnO into slag can improve the metallization of slag and magnetism of iron-rich phase, make the magnetic substances content increase and separation of phosphorus and iron incomplete, so it is adverse to phosphorus resources recovery from P-bearing slag by magnetic separation method. In order to recycle the phosphorus in P-bearing converter slag, the MgO and MnO content in the P-bearing slag should be controlled in the steelmaking process.

Effect of MgO and MnO on Phosphorus Utilization in P-Bearing Steelmaking Slag