METHOD FOR PRODUCING PIG IRON, AND BLAST FURNACE TO BE USED THEREFOR

WIPO Patent Application WO/2014/027481

A1

Provided is a blast furnace capable of reducing the production costs of pig iron, and suppressing the adhesion of blast-furnace-blowing-coal ash and blockages caused by blast-furnace-blowing-coal ash along the path of the blast-furnace blowing coal to the interior of the blast-furnace body. A blast furnace (100) is equipped with: a blast-furnace body (110); material-insertion means (111-113) for inserting a material (1) containing iron ore and coal into the interior of the blast-furnace body from the top section thereof; hot-air blowing means (114, 115) for blowing hot air (101) into the interior of the blast-furnace body through the tuyere thereof; and blast-furnace-blowing-coal supply means (120-129) for blowing blast-furnace-blowing coal (11) into the interior of the blast-furnace body through the tuyere thereof. Therein, the blast-furnace-blowing-coal supply means blow a blast-furnace blowing coal having the proportion of oxygen atoms contained therein (dry base) set to 10-20 wt%, and the average pore diameter set to 10-50nm, while the hot-air blowing means measure the melting point of the ash in the material in advance, and blow hot air which is 100-150°C lower than the melting point of the ash.

OMOTO SETSUO (JP)
NAKAGAWA KEIICHI (JP)
HAMADA TSUTOMU (JP)
SAKAGUCHI MASAKAZU (JP)

PCT/JP2013/062157

February 20, 2014

April 25, 2013

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MITSUBISHI HEAVY IND LTD (JP)

C21B5/00; C21B7/00

JP2011102439A	2011-05-26
JP2007169750A	2007-07-05
JPH09263807A	1997-10-07

MITSUISHI, Toshiro et al. (JP)
Toshiro Mitsuishi (JP)

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