Study on kinetic model for dephosphorization of high-phosphorus hot metal pretreatment

Focused on the hot metal pretreatment process and based on the powder injection metallurgy principle,a kinetic model for dephosphorization of high-phosphorus hot metal pretreatment was developed.The validity of this model was verified by comparison between the experimental results in laboratory and the calculated results.The influences of dephosphorization capacity of molten slag and technological conditions on the dephosphorization efficiency were calculated by applying the model.The results show that lower temperatures(such as 1 350 ℃) are favorable to dephosphorization,CaO content in slag should be controlled at about wt.50 %,suitable initial phosphorus content in the hot metal with higher phosphorus contents is about wt.0.35 % by comprehensively considering various factors,slag system with higher iron oxide contents and higher basicity(FeO content in slag is about wt.5 % and basicity of slag is about 3) have higher capacity of dephosphorization.