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Coke acts as a reducing agent, spacer, and heat source, and its strength is important for stable operation of a blast furnace.1,2) In recent years, utilization of high-reactivity coke has been necessary to enhance the efficiency of blast furnace operations with effective use of carbon resources.3,4) Highreactivity coke has received substantial attention because its use has been reported to decrease the reducing agent rate, which is an index of the use of carbonaceous materials in steel making processes.5,6) Ferro-coke is one of the highreactivity cokes, which is produced by blending iron ore with coal during coke production. The reactivity and strength of ferro-coke have been widely investigated. Nomura et al.7) reported that iron ore decreases the expansibility of coal particles even though ferro-coke has a high reactivity. Yamazaki et al. demonstrated that a decrease in the expansibility of coal particles reduces their adhesiveness.8) Yamamoto et al. produced different ferro-cokes with varying coal properties and blending ratios of coals and indicated that some of them show the same strength as chamber oven coke for the same conversion after reaction.9) In the above studies, reactivity and strength of ferro-coke after carbonization have been Effect of Iron Ore Reduction on Ferro-coke Strength with Hypercoal Addition

Effect of Iron Ore Reduction on Ferro-coke Strength with Hyper-coal Addition