LF精炼渣成分对帘线钢中铝含量的影响

Effect of Slag Compositions on [Al] Contents in LF Process

根据冶金熔体的共存理论,计算了CaO-MgO-MnO-FeO-SiO2-Al2O3六元渣系各组元的作用浓度。结合生产实际数据,建立了LF精炼过程中精炼渣成分和w[Al]之间氧化还原反应的数学模型,计算了精炼渣成分对w[Al]的影响。结果表明,LF精炼过程中w[Al]受w[Si]、w(FeO)联合控制。低碱度、低Al2O3含量的精炼渣对控制w[Al]有利,如果精炼渣碱度控制在0.9,Al2O3含量(质量分数,下同)控制在3%以下,则可以将w[Al]控制在6×10-6以下。适当提高FeO含量有利于降低w[Al]。

According to the coexistence theory of slag structure, mass action concentrations for CaO-MgO-MnO- FeO-SiO2-A1203 slag were calculated. Based on the practical data, a mathematical model of oxidation-reduction of CAll under some slag conditions in LF refining process was built. The influence factors about [A1] contents with different slag compositions were calculated. The results show that the [A1] contents can be controlled by w[Si] and w（FeO）. The refining slag of lower basicity and W（Al2O3） is advantageous to control [A1] contents, and it should be controlled under 6×10^-6 when the refining slag basicity is 0.9 and w（Al2O3） within 3%. The [A1] contents would be reduced when w（FeO） is appropriately raised. Key words： LF process ; refining slag ; [A1] content ; thermodynamics