METHOD FOR PRODUCING MOLTEN IRON WITH ELECTRIC FURNACE

WIPO Patent Application WO/2021/049125

A1

In the present invention, molten iron is produced in an electric furnace at low cost and with high efficiency in terms of energy utilization. Provided is a method of obtaining molten iron m in which, in an electric furnace in which a shaft-type preheating chamber 2 is provided contiguously to an upper part of a melting chamber 1 in order to preheat ferrous scrap x, the ferrous scrap x is preheated by causing exhaust gas produced in the melting chamber 1 to pass through the preheating chamber 2 into which the ferrous scrap x has been filled, and then the preheated ferrous scrap x is caused to successively descend from the inside of the preheating chamber 2 so as to be supplied into the melting chamber 1 and is melted in the melting chamber 1. The ferrous scrap x is charged into the preheating chamber 2 such that the apparent bulk density of the ferrous scrap x filled into the preheating chamber 2 is not less than 0.50 t/m3 but less than 1.00 t/m3 and the ferrous scrap filling ratio HSC/HSF in the preheating chamber 2 is 0.5-0.8. A carbon material is used as an auxiliary heat source for melting the ferrous scrap x in the melting chamber 1, and oxygen and the carbon material are injected into the melting chamber 1 such that the carbon/oxygen ratio C/O is not less than 0.70.

MIWA YOSHIHIRO (JP)
TSUTSUMI KOICHI (JP)
SUMI IKUHIRO (JP)

PCT/JP2020/024337

March 18, 2021

June 22, 2020

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JFE STEEL CORP (JP)

C21C5/52; F27B3/18; F27D13/00

WO2013099807A1

2013-07-04

JP2012180560A	2012-09-20
JPH06228623A	1994-08-16
JPH0914865A	1997-01-17
JP2003200131A	2003-07-15
JP2016509624A	2016-03-31
JP2012180560A	2012-09-20

See also references of EP 4029954A4

GINZA MARONIE P.C. (JP)

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