Dripping and evolution behavior of primary slag bearing TiO2 through the coke packed bed in a blast-furnace hearth

To investigate the flow of primary slag bearing TiO2 in the cohesive zone of blast furnaces,experiments were carried out based on the laboratory-scale packed bed systems. It is concluded that the initial temperature of slag dripping increases with decreasing Fe O content and increasing TiO2 content. The slag holdup decreases when the Fe O content is in the range of 5wt%–10wt%,whereas it increases when the Fe O content exceeds 10wt%. Meanwhile,the slag holdup decreases when the TiO2 content increases from 5wt% to 10wt% but increases when the TiO2 content exceeds 10wt%. Moreover,slag/coke interface analysis shows that the reaction between Fe O and TiO2 occurs between the slag and the coke. The slag/coke interface is divided into three layers: slag layer,iron-rich layer,and coke layer. TiO2 in the slag is reduced by carbon,and the generated Ti diffuses into iron.