Passivation of sponge iron

Details Passivation of sponge iron Passivation of sponge iron

C - Chemistry, Metallurgy

21

B

53/10

C21B 3/00 (2006.01) C21B 13/00 (2006.01) C22B 1/24 (2006.01)

Patent

CA 1193440

ABSTRACT OF THE DISCLOSURE Sponge iron pellets are protected against re-oxidation by pre-wetting them with water or steam, coating them with a pulverulent passivating agent which is a mixture of iron oxide particles and hydraulic cement particles, then drying the treated pellets. Especially good results are achieved by using a hydraulic cement such as Portland cement and an iron oxide/cement ratio of 40:60 to 70:30.

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