Abstract: A FeO mass fraction dynamic model of prediction in slag of converter was established combined with the production data of 300 ttopbottom combined blowing converter, using the oxygen balance of converter material balance. It could predict the mass fraction of FeO in slag and the relationship between the FeO mass fraction in slag and topblowing oxygen quantity, phosphorus distribution ratio LP. The results showed that the FeO mass fraction calculation of slag had a good agreement with the measured value, and the ratio of absolute error less than 5% and relative error less than 10% was more than 80%.

Key words: converter, material balance, phosphorus distribution ratio, FeO prediction model