Title:
METHOD FOR PRODUCING LOW-CARBON FERROCHROME
Document Type and Number:
WIPO Patent Application WO/2022/149577
Kind Code:
A1
Abstract:
Provided is a method for producing low-carbon ferrochrome, whereby it becomes possible to allow a reduction reaction of chromium oxide to proceed even at a low base degree. The method for producing low-carbon ferrochrome comprises: a first step (S1) for melting chromium ore and calcined lime in an electric furnace; and a second step (S2) for charging a molten raw material that has been melted in the first step (S1) (also referred to as a "primary slag", hereinafter) and a reducing agent into a reaction container and then stirring the primary slag and the reducing agent together to produce low-carbon ferrochrome and a secondary slag. In the second step (S2), a gas bottom blowing device in which a slit-type plug is provided at a center part of the bottom of a reaction container is used, and the stirring gas amount per 1 t of the total charged raw material in the second step (S2) is set to 25 Nl/min to 500 Nl/min.
Inventors:
SUGIMORI HIROICHI (JP)
MORI MASAHIRO (JP)
MORI MASAHIRO (JP)
Application Number:
PCT/JP2022/000098
Publication Date:
July 14, 2022
Filing Date:
January 05, 2022
Export Citation:
Assignee:
JFE MINERAL & ALLOY COMPANY LTD (JP)
International Classes:
C22C33/04
Domestic Patent References:
| WO2021010313A1 | 2021-01-21 |
Foreign References:
| JP2011094210A | 2011-05-12 | |||
| JPH06212343A | 1994-08-02 | |||
| JPH0551690A | 1993-03-02 | |||
| JP2012041618A | 2012-03-01 | |||
| JPH01225743A | 1989-09-08 | |||
| JPS63192841A | 1988-08-10 | |||
| US4565574A | 1986-01-21 |
Attorney, Agent or Firm:
SHIOJIMA, Toshiyuki (JP)
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