Effect of basicity on dephosphorization of hot metal with a low basicity slag at 1653 K.

This research aims to investigate the influence of the slag basicity from 1.40 to 1.83 on dephosphorization of the hot metal with a CaO–FeO–SiO2–MgO–Al2O3 molten slag at the low temperature of 1653 K. The results indicated that the dephosphorization ratio was increased with the increase of basicity. Even at the low basicities of 1.73 and 1.83, the dephosphorization ratios can be as high as 77.3 and 80.7%, respectively. With the increase of basicity, the contents of P2O5 and total iron in the slag were increased, whereas the content of MnO was decreased. The distribution ratio of phosphorus (L P) was expressed as log ⁡ L P = 19.4 Λ − 6381 T + 5.244 + log ⁡ f P + 5 4 log ⁡ P ( O 2) . The L P values calculated by the present method are well consistent with the measurement values. Besides, the dark grey phase B and the light grey phase D could be considered as the phosphorus-rich phases containing C2S solid particles. [ABSTRACT FROM AUTHOR]