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Reduced iron (1.74% P) is produced from oolitic hematite ore by coal-based reduction and magnetic separation. To realize the comprehensive utilization of Fe and P, the dephosphorization behavior of the reduced iron is investigated in the presence of CaO–SiO 2 –FeO–Al 2 O 3  slag. The P content of the final iron and the P 2 O 5  content of the high-P-containing slag are determined, and the phase composition and P 2 O 5  solubility of the slag are analyzed. The P content can be decreased to 0.2% when the initial slag has a basicity of 3.5 and contains 55% FeO and 6% Al 2 O 3 . The phases of the high-P-containing slag are mainly Ca 2 Al 2 SiO 7 , Ca 2 SiO 4 , Ca 5 (PO 4 ) 2 SiO 4 , and FeO, and P exists in the form of Ca 5 (PO 4 ) 2 SiO 4 . Excessively high basicity or low content of FeO and Al 2 O 3  results in free CaO, which affects the dephosphorization results. The change rule of the intensity of the Ca 5 (PO 4 ) 2 SiO 4  diffraction peak agrees well with the dephosphorization indexes, which further verify the accuracy of the dephosphorization experiments. Moreover, the P 2 O 5  content and P 2 O 5  solubility of the high-P-containing slag reached as high as 14.41 and 94.54%, respectively, indicating that it can be used as a phosphate fertilizer.

Dephosphorization behavior of reduced iron and the properties of high-P-containing slag