酸化鉄ペレットの還元に及ぼすガス状硫化物の影響

抄録

Effects of addition of 5% of gaseous sulfide on the rate of reduction of iron oxide pellets were studied in the temperature range of 800°C to 1 000°C with the following results;
(1) The reduction rate was greatly decreased with the addition of COS and H₂S respectively to CO and H₂.
(2) Analysis of the reduction rate based on the unreacted-core model and observation of the fractured surface of partially reduced pellets by using a scanning electron microscope and an electron probe microanalyser demonstrated that the formation of dense FeS shells offered great resistance to the intraparticle diffusion of reducing gas toward the oxide core, thus greatly retarding the reduction of pellets, and that the partial penetration of the sulfide gas into the oxide core was also responsible to the decrease of reduction rate.
Although the sulfide content of reducing gas in the present work is much higher than that of blast furnace shaft gas, the present results will be helpful for better understanding of the behavior of sulfur in the blast furnace shaft.