METHOD FOR DRYING MOLDING CONTAINING OXIDIZED METAL, METHOD FOR REDUCING OXIDIZED METAL AND ROTARY HEARTH TYPE METAL REDUCTION FURNACE

Title:

METHOD FOR DRYING MOLDING CONTAINING OXIDIZED METAL, METHOD FOR REDUCING OXIDIZED METAL AND ROTARY HEARTH TYPE METAL REDUCTION FURNACE

Document Type and Number:

WIPO Patent Application WO/2003/031659

Kind Code:

A1

Abstract:

A method for drying a molding containing moisture without causing burst or powdering, a method for reducing a dried molding efficiently in a rotary hearth type reduction furnace, and a rotary hearth type metal reduction furnace. At the time of drying a molding composed of powder containing an oxidized metal and carbon, a limit value of moisture evaporation rate causing no burst is determined from the size and porosity of the molding and a steam generation rate lower than that limit value is employed in order to prevent inner pressure rise of the molding due to steam generation. The molding is prevented from bursting or cracking by that method. At the time of drying the molding in the rotary core floor type reduction furnace, heat supply rate to the molding is controlled by that method and burst is prevented thus firing and reducing the molding continuously in the same furnace.

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Inventors:

IBARAKI TETSUHARU (JP)
YAMAMOTO TAKASHI (JP)
ABE YOICHI (JP)
TAKAHASHI SHIGEKI (JP)
NAGAI KAZUNORI (JP)

Application Number:

PCT/JP2002/003273

Publication Date:

April 17, 2003

Filing Date:

April 01, 2002

Export Citation:

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Assignee:

NIPPON STEEL CORP (JP)
IBARAKI TETSUHARU (JP)
YAMAMOTO TAKASHI (JP)
ABE YOICHI (JP)
TAKAHASHI SHIGEKI (JP)
NAGAI KAZUNORI (JP)

International Classes:

C21B13/00; C21B13/10; F27B9/16; F27B9/36; F27D19/00; F27D21/00; C22B1/24; C22B1/245; (IPC1-7): C21B13/10

Foreign References:

JP2001032005A	2001-02-06
JP2001234220A	2001-08-28
JPH1112621A	1999-01-19

Other References:

See also references of EP 1439236A4
None

Attorney, Agent or Firm:

Ishida, Takashi (ISHIDA & ASSOCIATES Toranomon 37 Mori Bldg., 5-1, Toranomon 3-chom, Minato-ku Tokyo, JP)

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