Importance

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Abstract

Provided is a method for preparing blast furnace blow-in coal that can, at a low cost, obtain blast furnace blow-in coal that suppresses occlusion by blast furnace blow-in ash or accretion of blast furnace blow-in ash in a pathway leading to a tuyere of a blast furnace main body, while suppressing a decrease in the amount of heat release. The method includes selecting first and second coal types satisfying conditions (S2, S3), on the basis of the CaO content in the ash when the oxides of Al, Si, Ca, and Mg in the ash is 100 wt % and the Al₂O₃ content in the ash is 20 wt %, deriving the mixing ratio of the first and second coal types that results in the CaO content in the ash of the mixed coal being at least 40 wt % (S4), and mixing the first and second coal types (S5) at the mixing ratio.

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First Claim