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1. (WO2017170100) METHOD FOR OPERATING BLAST FURNACE

Pub. No.:    WO/2017/170100    International Application No.:    PCT/JP2017/011641
Publication Date: Fri Oct 06 01:59:59 CEST 2017 International Filing Date: Fri Mar 24 00:59:59 CET 2017
IPC: C21B 5/00
Applicants: JFE STEEL CORPORATION
JFEスチール株式会社
Inventors: YAMAMOTO Naoki
山本 尚貴
MURAO Akinori
村尾 明紀
MORIYA Kota
盛家 晃太
OYAMA Nobuyuki
大山 伸幸
Title: METHOD FOR OPERATING BLAST FURNACE
Abstract:
Provided is a method for operating a blast furnace with which it is possible to reduce the reduction agent ratio of the blast furnace. In this method for operating a blast furnace, pulverized coal is blown from a blast furnace tuyere. The method comprises: adjusting a coal containing water and volatile matter, thereby providing an adjusted pulverized coal having a specific surface area within the range of 2 m2/g to 1000 m2/g, a lower heating value of 27170 kJ/kg or more and a volatile matter content within the range of 3% by mass to 25% by mass; and blowing pulverized coal containing the adjusted pulverized coal in an amount of 10% by mass or more from the blast furnace tuyere.