高磷铁水预处理脱磷动力学模型研究

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

针对铁水预处理工艺并基于喷粉冶金原理,建立了高磷铁水预处理脱磷动力学模型。通过将实验室试验结果与模型计算结果对照,验证了模型的有效性,并应用模型计算分析了熔渣脱磷能力和工艺条件对脱磷效果的影响。结果表明:铁水温度控制在1 350℃、渣中w(CaO)控制在50%、高磷铁水预处理的初始w(P)为0.35%、w(FeO)为5%左右,碱度为3具有较强的脱磷能力。

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.