Interfacial Kinetics of Hydrogen with Liquid Slag Containing Iron Oxide

摘要

The rate of reduction of liquid iron oxide contained in the solid iron crucible with H_2 was studied by using a thermobalance. The effect of additives on the chemical reaction rate was estimated by combining the hydrogen reduction rate of pure liquid Fe_tO observed in the present work with the slag composition dependence of CO reduction rate obtained in our previous work. Observed chemical reaction rates were in good accord with the estimated in the reduction of Fe_tO-CaO and Fe_tO-SiO_2 slags. It was found from the comparison of the hydrogen reduction rate with available literature data that the rate of hydrogen reduction is much faster than that with other reducing agents such as solid carbon, carbon dissolved in the liquid iron and CO gas. Therefore, hydrogen should be utilized for more effective and rapid reduction of liquid iron oxide in the bath smelting process while additional heat or energy would be necessary for the endothermic reaction of hydrogen reaction with liquid iron oxide.