METHOD FOR PRODUCING REDUCED IRON COMPACT IN ROTARY HEARTH REDUCING FURNACE, REDUCED IRON COMPACT, AND METHOD FOR PRODUCING PIG IRON USING THE SAME

Title:

METHOD FOR PRODUCING REDUCED IRON COMPACT IN ROTARY HEARTH REDUCING FURNACE, REDUCED IRON COMPACT, AND METHOD FOR PRODUCING PIG IRON USING THE SAME

Document Type and Number:

WIPO Patent Application WO/2003/025231

Kind Code:

A1

Abstract:

A method for producing a reduced iron compact having a high crushing strength, hardly powdering, and having a high reducibility by using a baking reducing furnace of solid reducing type such as a rotary hearth reducing furnace, a reduced iron compact produced by the method, and a method for smelting−reducing the reduced iron compact in a blast furnace. In the method for producing the reduced iron compact, the compact is so produced that the atomic molar ratios of the carbon in a raw powder of a mixture of an iron oxide−containing powder and a carbon−containing powder and the oxygen chemically bonded to iron, manganese, nickel, zinc, and lead or the content of the ferric oxide in the raw powder is in a specific range and that the porosity is in a specific range, and the compact is placed on the hearth of a reducing furnace which the hearth rotates the compact, heated by the heat of the burning gas in the upper part of the furnace, and baked and reduced above a predetermined temperature.

Inventors:

IBARAKI TETSUHARU
IMURA SHOUJI
ODA HIROSHI
TAKAHASHI MASAHARU
ABE YOICHI
TAKAHASHI SHIGEKI
SUZUKI SATOSHI

Application Number:

PCT/JP2002/009062

Publication Date:

March 27, 2003

Filing Date:

September 05, 2002

Export Citation:

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Assignee:

NIPPON STEEL CORP (JP)

International Classes:

C21B13/00; C22B1/16; C21B13/02; C21B13/10; (IPC1-7): C21B13/10

Foreign References:

JP2000034526A

2000-02-02

Other References: