METHOD FOR REDUCING IRON ORE

PROBLEM TO BE SOLVED: To provide a method for reducing iron ore where iron ore is reduced at high efficiency, thus the optimization of a molten iron temperature, the improvement of dephosphorization efficiency and the reduction of iron loss are made possible.SOLUTION: Provided is a method for reducing iron ore in converter type molten iron preliminary treatment, including: the first step where the basicity of slag 11 in a converter 10 is controlled to 0.5 to below 1, and also, the viscosity of the slag 11 is controlled to 0.15 Pa s or lower, and iron ore is charged inside the converter 10; and the second step where lime-based raw material is charged inside the converter 10 to increase the basicity of the slag 11 into 1 to 1.5.SELECTED DRAWING: Figure 1 【課題】鉄鉱石を高効率で還元させて、溶銑温度の適正化、脱Ｐ効率の向上、及び、鉄分ロスの低減を可能にする鉄鉱石の還元方法を提供する。【解決手段】転炉型溶銑予備処理における鉄鉱石の還元方法であり、転炉１０内のスラグ１１の塩基度を０．５以上１未満、かつ、スラグ１１の粘度を０．１５Ｐａ・ｓ以下にして、転炉１０内に鉄鉱石を投入する第１工程と、転炉１０内に石灰系原料を投入してスラグ１１の塩基度を上昇させ、１以上１．５以下に調整する第２工程とを有する。【選択図】図１