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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 SiC>2), such as silica; forming green agglomerates from this mixture; and hydrother- mally hardening the green agglomerates by contacting them with steam under pressure.
Board of Control of Michigan Technological University, Houghton, Mich.
Certificate of Correction
Goksel, Mehmet A., "Self-reducing iron oxide agglomerates" (1985). Michigan Tech Patents. 47.