STEEL-SLAG MASS TRANSFER IN STEEL CONVERTER, BOTTOM AND TOP/BOTTOM COMBINED BLOWING THROUGH COLD MODEL EXPERIMENTS

摘要

Steel-slag mass transfer is a key step in the removal of different components,such as sulphur or phosphorous,during the steelmaking process in the steel converter.As the reactions taking place are very fast,steel-slag mass transfer is an important stage in the overall process.Non-systematic data of the liquid-liquid mass transfer coefficients from real converters,or cold model set-ups,have been reported in the literature.This research work is a study of the steel-slag mass transfer coefficients in a cold model,as similar as possible to a real converter with respect to geometry and physical properties.The effect of the gas flow rate was studied in bottom and top-bottom combined blowing,comparing the efficiency of each blowing type.The results are also analysed developing a two-zone model,due to the existing mixing problems,thus determining the local variation of mass transfer coefficients in the converter.These values are important not only with the aim of modelling the steel -slag reactor,but moreover to analyse the effect of the method of adding reagents to the converter during blowing.