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 con-centration 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 in-creases 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.(c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

This study investigates the effect of hydrogen on slag formation behavior in a hydrogen-rich blast furnace. It is found that the participation of iron coke and hydrogen promotes the production of high melting point substances in slag and increases the melting start temperature. Moreover, hydrogen and iron coke also promote the carburization of dripping iron, thereby improving the permeability of the blast furnace.