PRODUCTION METHOD FOR REDUCED IRON

WIPO Patent Application WO/2012/066899

A1

Provided is a technique which makes production of reduced iron with a per-piece crushing load of 80kgf or greater achievable. In this production method for reduced iron, when heating an agglomerate containing an iron oxide-containing substance and a carbonaceous reducing agent and producing a reduced iron by reducing the iron oxide in the agglomerate, the agglomerate is heated in a first phase wherein heating is conducted so that, with a heating temperature range determined on the basis of the basicity (CaO/SiO2 ratio) of the agglomerate, and described below in (a)-(d), the metallization ratio becomes 60%-95%. The agglomerate is subsequently heated in a second phase wherein heating is conducted at 1300-1400°C, for 5-18 minutes. (a) If CaO/SiO2<0.93, the heating temperature range shall be 1093°C or less. (b) If 0.93≤CaO/SiO2<1.07, the heating temperature range shall be 1223°C or less. (c) If 1.07≤CaO/SiO2<1.87, the heating temperature range shall be 1230°C or less. (d) If 1.87≤CaO/SiO2, the heating temperature range shall be less than 1300°C.

WO/2006/061790	METHOD AND SYSTEM FOR PRODUCING METALLIC IRON NUGGETS
JP4181056	Metallic iron manufacturing method
JP3837845	PRODUCTION OF REDUCED IRON

SUGIYAMA TAKESHI
TATEISHI MASATAKA
HARADA TAKAO
YOSHIDA SHOHEI

PCT/JP2011/074323

May 24, 2012

October 21, 2011

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KOBE STEEL LTD (JP)
SUGIYAMA TAKESHI
TATEISHI MASATAKA
HARADA TAKAO
YOSHIDA SHOHEI

C21B13/10; C22B1/243

WO2011010667A1

2011-01-27

JPS60100635A	1985-06-04
JPH02228411A	1990-09-11
JP2000045008A	2000-02-15
JP2001279313A	2001-10-10
JP2009102746A	2009-05-14

UEKI, Kyuichi et al. (JP)
Hisakazu Ueki (JP)

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