Partition of valuable components between slag and metal in the blast furnace operating with high chromium, vanadium, titanium, magnetite ores

摘要

In order to master the partition between metal and slag for high chromium vanadium titanium magnetite in ironmaking process, the same batch of sinter, pellet, hot metal and slag were investigated mainly from two viewpoints of phase composition change and distribution of valuable components in this study. Chemical analysis, XRD and SEM-EDS analysis, material balance and distribution of valuable components reveal that the total input-output amounts of valuable components are nearly balanced under the stable operation condition. 98.60% of iron, 86.71% of vanadium, 83.73% of chromium and only 6.48% of titanium have passed to hot metal. The distribution of titanium and silicon between hot metal and slag was investigated, which is in accordance with the previous studies in the laboratory condition. The phase composition change process of vanadium is V2O3 -> [V]. The reduction process of chromium oxide is Cr2O3 -> [Cr]. The titanium oxide is partially reduced into the hot metal in the hearth by the reaction: TiO2 -> [Ti], then the dissolved titanium can easily react with C and N-2 forming Ti(C,N).