Self-reducing iron oxide agglomerates

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

1983-02-16

1985-07-09

Richman, Barry S.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

23313R, C22B 114

Patent

active

045280290

ABSTRACT:
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 SiO.sub.2), such as silica; forming green agglomerates from this mixture; and hydrothermally hardening the green agglomerates by contacting them with steam under pressure.

REFERENCES:
patent: 3770416 (1973-11-01), Goksel
patent: 3993471 (1976-11-01), Yoshmura et al.
patent: 4179283 (1979-12-01), Rehder
patent: 4181520 (1980-01-01), Reuter et al.

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