Amine treatment for passivating sponge iron

Details Amine treatment for passivating sponge iron Amine treatment for passivating sponge iron

1980-07-01

1982-05-11

Andrews, M. J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 34, C23F 1102

Patent

active

043291686

ABSTRACT:
Sponge iron may be passivated against reoxidation by air and water vapor by contacting it with an amine containing from about one to about twelve carbon atoms. The amine contact may be accomplished in the vapor phase by adding the amine to a cooling gas which is employed to cool freshly reduced sponge iron to a safe temperature. Alternatively, the cooled sponge iron may be immersed in an aqueous amine solution to inhibit it against reoxidation.

REFERENCES:
patent: 2862808 (1958-12-01), De Jahn
patent: 3346366 (1967-10-01), Mayer et al.
patent: 4169533 (1979-10-01), Rubio

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