Self-reducing iron oxide agglomerates

Details Self-reducing iron oxide agglomerates Self-reducing iron oxide agglomerates

C - Chemistry, Metallurgy

22

B

53/11

C22B 1/243 (2006.01) C21B 13/10 (2006.01) C22B 1/24 (2006.01) C22B 1/245 (2006.01)

Patent

CA 1158442

ABSTRACT OF THE DISCLOSURE Self-reducing agglomerates of an iron oxide- containing material, such as an iron ore concentrate, having a compressive strength of at least about 100 lbs. are produced by preparing a moistened mixture of the ore concentrate, a finely-divided natural pyrolyzed carbonaceous material having a volatile matter (on dry basis) content of about 20 weight % or less in an amount at least sufficient to reduce all the iron oxide to metallic iron, about 1 to about 30 weight % of a bonding agent, such as burned or hydrated lime, and 0 up to about 3 weight % of a siliceous material (as SiO2), such as silica; forming green agglomerates from this mixture; and hydrothermally hardening the green agglomerates by contacting them with steam under pressure.

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