Energy consumption and CO₂ emission from the iron and steel industry in Japan are each 12.5% in comparison to them of the whole Japan. Blast furnace process occupies a half of them in the iron and steel industry. Improvement of gaseous reduction for iron ore agglomerates at high temperatures is very effective to decrease in energy consumption and CO₂ emission from blast furnace. In the present study, reducibility at high temperatures of 1100, 1150, 1200℃ and observation of pore occlusion by molten slag were investigated with artificial iron ore agglomerates including CaO and SiO₂, of which have micro pores, macro pores and a penetrated hole.
　　　Influence of the melt formation on the reducibility is very strong, and the reduction rate at 1100℃ is faster than them at 1150 and 1200℃ although the reduction rate constant is more fast in proportion to temperature up. At 1200℃, macro pores become isolation pores by melt. On the other hand, a penetrated hole with 1 or 2mm is not closed by melt, and improves the reducibility. Penetrated hole is very effective to improve the reducibility of iron ore agglomerates at high temperature zones with melt formation.