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Sinters are the main iron source for a blast furnace, and the reducibility of sinters is one of the crucial factors affecting the operation stability of a blast furnace.1–3) Sinters are primarily composed of hematite (Fe2O3), magnetite (Fe3O4), calcium ferrite (mainly silico–ferrite of calcium and aluminum (SFCA)) and slag phases; among them, Fe2O3 and SFCA are in main proportion. Sinters are reduced in a blast furnace, which reduction process is very complicated because temperature as well as gas components change depending on the position of the furnace. This reduction normally proceeds via two steps: (i) Fe2O3, Fe3O4 and SFCA are reduced to wüstite in the lower temperature zone and (ii) wüstite is reduced to metallic iron (Fe) in the thermal reserve zone and in the even higher temperature zone. The overall reduction efficiency of a blast furnace is dominated by the second-step reaction rate at higher temperatures.4–6) Comparison between Reducibilities of Columnar Silico-ferrite of Calcium and Aluminum (SFCA) Covered with Slag and Acicular SFCA with Fine Pores