Jfe Steel Corporation

Nobuyuki Oyama

Naoki Yamamoto

Tetsuya Yamamoto

Yasuo Nagashima

Katsuhiro Iwasaki

Akinori Murao

Yuji Iwami

Kanji Aizawa

Takahide Higuchi

Kota Moriya

Takayuki Ueki

Toshiyuki Hirosawa

Kazumi Iwase

Hiroshi Tako

Hideki Kadoya

Provided is a blast furnace operation method that enables lowering of the reducing agent ratio of a blast furnace. The blast furnace operation method includes injecting pulverized coal through tuyeres of a blast furnace. The method includes adjusting coal containing moisture and volatile matter to form adjusted pulverized coal having a specific surface area within a range of 2 m/g or more and 1000 m/g or less, a lower heating value of 27170 kJ/kg or more, and a volatile matter content within a range of 3 mass % or more and 25 mass % or less. The method further includes injecting, through the tuyeres of the blast furnace, pulverized coal in which the adjusted pulverized coal, in a mixing ratio of 10 mass % or more, is mixed.

Blast furnace operation method

As a pretreatment of a manufacturing process of sintered ore, a sintering material including iron ore, a SiO-containing material, a limestone base powdery material and a solid fuel type powdery material is projected as a additional coating auxiliary raw material into the drum mixer with a additional coating conveyor disposed in proximity to an exhaust outlet of the drum mixer. Preferably, a sintering material excepting a limestone base powdery material and a solid fuel type powdery material is charged from a charge inlet of the drum mixer to granulate and in a region disposed on a downstream side, an additional coating auxiliary raw material including a limestone base powdery material and a solid fuel type powdery material is added, and thereby until reaching the exhaust outlet, the additional coating auxiliary raw material is deposited and formed on a exterior coating portion of the sintering material.

Process for producing sintering feedstock and apparatus therefor

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Tokyo, Japan

Nobuyuki Oyama