Hydrogen on softening-melting and slag forming behavior under the operation of blast furnace with iron coke charging.

The effect on the slag formation behavior in the softening melting zone of a hydrogen-rich blast furnace is investigated by charging iron coke to the iron ore and controlling different volume fractions of hydrogen. The reduction mechanism of iron coke to iron ore under hydrogen-rich conditions is expounded that iron coke and hydrogen increase the concentration of CO around iron ore and promote its further reduction. The participation of iron coke and hydrogen promotes that FeO is reduced to Fe in iron ore, which prompts the production of high melting point substances in slag. The melting point of slag iron increases the melting start temperature. Hydrogen and iron coke promote the carburization of dripping iron so that molten iron drips quickly, which narrows the melting drop interval. From the perspective of the maximum pressure difference and the comprehensive permeability S value, the blast furnace permeability will be improved. • The effect on soft molten drop zone of hydrogen and iron coke. • The reduction mechanism is expounded with hydrogen and iron coke. • The slag melting point rises and molten iron carburization is promoted. • The permeability of the softening melting zone is improved with hydrogen and iron coke. [ABSTRACT FROM AUTHOR]