Title:
PRODUCTION METHOD FOR GRAINED IRON, AND GRAINED IRON
Document Type and Number:
WIPO Patent Application WO/2023/204071
Kind Code:
A1
Abstract:
Provided is a technology that enables efficient production of grained iron having a low P concentration. The present invention comprises: a first step for melting reduced iron to obtain primary molten iron; a second step for separating the primary molten iron from slag; a third step for subjecting the primary molten iron separated from the slag to dephosphorization to obtain secondary molten iron; and a fourth step for solidifying the secondary molten iron into grains to obtain grained iron. In the third step, an oxygen source and a CaO source are supplied to the primary molten iron for dephosphorization, and the temperature of the secondary molten iron when the dephosphorization is finished is set to be equal to or lower than the temperature of the secondary molten iron when the dephosphorization is started.
Inventors:
SUGINO TOMOHIRO (JP)
NAKASE KENJI (JP)
OGASAWARA FUTOSHI (JP)
KAWABATA RYO (JP)
NAKASE KENJI (JP)
OGASAWARA FUTOSHI (JP)
KAWABATA RYO (JP)
Application Number:
PCT/JP2023/014502
Publication Date:
October 26, 2023
Filing Date:
April 10, 2023
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21B13/00; C21B11/00; C21C1/02; C21C7/064
Foreign References:
| JP2011144431A | 2011-07-28 | |||
| JPH01252753A | 1989-10-09 | |||
| JP2021161465A | 2021-10-11 | |||
| JPS5785905A | 1982-05-28 | |||
| JPS491996B1 | 1974-01-17 | |||
| JPS5439357A | 1979-03-26 |
Attorney, Agent or Firm:
GINZA MARONIE P.C. (JP)
Download PDF: