ABSTRACT

The kinetic investigation of the dephosphorization in the new double slag converter steelmaking process was carried out based on the coupled reactions model combining with a heat balance temperature model for the 220-ton industrial experiment. The calculated results of [%C], [%Si], [%P] in the hot metal, and the slag compositions are in good agreement with the experimental results. When the heat balance temperature model is applied, the P prediction results are better rather than those predicted by using the fixed temperatures. The calculated phosphorus distribution ratio increases with the refining time, while the phosphate capacity shows a downward trend due to the decrease in slag basicity and the increase in temperature. The rate-controlling step of the dephosphorization is determined to be the mixed control of the mass transfer of P in the hot metal and P₂O₅ in the slag. As the initial Si concentration is increased, the interfacial oxygen activity required for starting the dephosphorization is increased, leading to the delay of the dephosphorization start time.

摘要

基于耦合反应模型结合热平衡温度模型，对220吨级工业实验进行了双渣转炉炼钢新工艺脱磷动力学研究。铁水中[%C]、[%Si]、[%P]和炉渣成分的计算结果与实验结果吻合较好。当应用热平衡温度模型时，P 预测结果比使用固定温度预测的结果要好。计算出的磷分配比随着精炼时间的延长而增加，而磷容量则由于渣碱度降低和温度升高而呈下降趋势。₂ O ₅中渣。随着初始Si浓度的增加，开始脱磷所需的界面氧活度增加，导致脱磷开始时间延迟。