METHOD FOR PRODUCING CHROMIUM-CONTAINING MOLTEN IRON

Title:

METHOD FOR PRODUCING CHROMIUM-CONTAINING MOLTEN IRON

Document Type and Number:

WIPO Patent Application WO/2020/213393

Kind Code:

A1

Abstract:

According to the present invention, a charge containing: ferrochromium and/or ferrosilicon alloy iron containing metallic Si; and unreduced slag containing Cr oxide generated during oxidative refining is charged into an electric furnace, as a formulation in which a mass ratio defined as the amount of metallic Si/the amount of Cr oxide is 0.30-0.40, and a C concentration is from 2.0 mass% to a saturation concentration. The charge is heated and melted in the electric furnace to produce molten iron which contains Cr reduced from Cr oxide, wherein, during the heating and melting of the charge, the ultimate temperature is 1400-1700°C, the maximum average heating rate in an arbitrary 80°C-span zone from 1300°C to the ultimate temperature is 15°C/min or less, and the minimum average heating rate in an arbitrary 80°C-span zone from 1300°C to the ultimate temperature is 3.0°C/min or greater.

Inventors:

ASAHARA NORIFUMI (JP)
KATO KATSUHIKO (JP)
FUTAKA MIKIO (JP)
TANAKA YASUHIRO (JP)
KANEKO NAOKI (JP)
NAKAGAWA JUNICHI (JP)

Application Number:

PCT/JP2020/014961

Publication Date:

October 22, 2020

Filing Date:

March 31, 2020

Export Citation:

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Assignee:

NIPPON STEEL CORP (JP)

International Classes:

C21C5/52; C22B7/04; C22B34/32

Foreign References:

JP2010242128A	2010-10-28
JP2010090428A	2010-04-22
JP2019080179A	2019-05-23

Other References: