IF钢全氧的控制与预测

Control and prediction of total oxygen in IF steel

分析了IF钢冶炼过程中渣对钢液中[Al]、[Ti]的氧化机理,在此基础上提出了IF钢加铝脱氧后全氧的预测模型.结果表明,熔渣中(FeO)、(MnO)对钢液的二次氧化存在两种方式.当氧化物在渣中的传质是反应限制性环节时,反应发生在渣/钢界面,生成的脱氧产物分布在渣/钢界面,此时渣的氧化性随时间呈指数下降;当脱氧元素在钢中传质是反应限制性环节时,反应发生在钢液内部.对某厂RH精炼渣的数据作回归得到RH加铝后渣的氧化性随时间指数变化的关系式.

The reoxidation mechanisms of IF steel containing Al and Ti by reducible oxides in the slag were analyzed.A model of predicting total oxygen in the molten steel was established based on the reoxidation mechanisms.It was found that two different reaction mechanisms existed when（FeO）and（MnO）in the slag reoxidated the molten steel.Reoxidation occurred at the slag/steel interface when mass transfer of reducible oxides in the slag dominated the reaction,and the oxidability of the slag exponentially declined with prolonging time.When mass transfer of de-oxidative elements in the molten steel dominated the reaction,reoxidation carried out in the molt steel.A specific formula between the oxidability of the slag and time was obtained by regressing the data from a steelmaking plant.