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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 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.

Patent Number

4,528,029

Assignee

Board of Control of Michigan Technological University, Houghton, Mich.

Application Number

580,828

Date Filed

2-16-1983

Certificate of Correction

No

Issue Date

7-9-1985

Self-reducing iron oxide agglomerates

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