METHOD FOR PRODUCING HOT METAL USING SOLID REDUCING FURNACE AND SUBMERGED ARC FURNACE

WIPO Patent Application WO/2024/062742

A1

Provided is a method for producing a hot metal, whereby it becomes possible to achieve high energy efficiency in a melting step when reduced iron is produced from iron ore in a solid reducing furnace and then the reduced iron is melted in a SAF to produce a hot metal. The method for producing a hot metal according to the present invention comprises a step for producing first reduced iron from low-grade iron ore pellets, an optional step for producing second reduced iron from high-grade iron ore pellets, an optional step for producing third reduced iron from lump ore, an optional step for preparing fourth reduced iron, and a step for melting the first reduced iron to fourth reduced iron in a SAF and adding a slag-making material to the resultant product for basicity adjustment purpose, in which the following formula is satisfied.　150.0 ≤ S1×W1+S2×W2+S3 ≤ 400.0, in which S1: the slug ratio of the first reduced iron, W1: the blend ratio of the first reduced iron, S2: the average slug ratio of the second reduced iron to fourth reduced iron, W2: the total blend ratio of the second reduced iron to fourth reduced iron, and S3: the amount of the slag-making material to be added in the melting step.

IWAMI YUJI (JP)
HIGUCHI TAKAHIDE (JP)
TAKEHARA KENTA (JP)
HORITA KENYA (JP)
NAKAMURA NAOTO (JP)
FUJIWARA SHOHEI (JP)

PCT/JP2023/025630

March 28, 2024

July 11, 2023

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JFE STEEL CORP (JP)

C21B11/10; C21B3/02; C21B13/12; C21C1/00

JP2018095893A	2018-06-21
JPS5544598A	1980-03-28

SUGIMURA Kenji (JP)

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