Process for the passivation of sponge iron utilizing reducing ga

Details Process for the passivation of sponge iron utilizing reducing ga Process for the passivation of sponge iron utilizing reducing ga

1976-08-23

1978-01-24

Andrews, M. J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 34, C23F 704, C23F 902

Patent

active

040701808

ABSTRACT:
Passivation of sponge iron by a mild reoxidation thereof is effected by contact, at a temperature of 200.degree. to 600.degree. F, with a gaseous atmosphere consisting essentially of 25 to 80% H.sub.2, 15 to 70% CO and 0.5% to 4.0% O.sub.2 for a time in excess of about 1 hour. The passivation atmosphere may be produced by dilution of a free-oxygen-containing gas with conventional reducing gases. Therefore, the process is particularly amenable to the in-line passivation of hot reduced pellets i.e. wherein passivation may be effected directly within the lower portion of a shaft furnace.

REFERENCES:
patent: 2578800 (1951-12-01), Hamister
patent: 3160498 (1964-12-01), Olt et al.
patent: 3617394 (1971-11-01), Mayer
patent: 3844764 (1974-10-01), Beggs
patent: 3850616 (1974-11-01), Cruse, Jr.

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