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US 6,248,152 B1Granted
Method of reducing iron oxide on a movable hearth furnace
AssigneeKawasaki Steel Corporation
InventorsKanji Takeda, Yoshitaka Sawa
Life of this patent
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Abstract
With a solid fine reducing material containing hydrogen placed as a lower layer on a movable hearth, a powdered mixture of an oxide powder dominantly of a fine iron ore and a solid fine reducing material is stacked in layered arrangement, and subsequent reduction operation is performed.
Claims5
A method of reducing iron ore on a movable hearth furnace, comprising the steps of:
- supplying a lower layer of a solid fine reducing material on said hearth, having hydrogen content of 0.5% by weight or more,
- supplying a mixed layer dominantly comprising a fine iron ore and a solid fine reducing material on said movable hearth;
- arranging said powder and said fine reducing material superposed on said lower fine reducing material layer;
- and
- subjecting said oxide powder to reduction by radiant heat transfer transmitted from an upper furnace portion within said furnace,
- wherein a powder mixture comprising a fine iron ore and a solid fine reducing material is stacked in a layered arrangement on said layer of a solid fine reducing material having a hydrogen content of 0.5% by weight or more.
3 more elements
Dependencies are inferred from the claim text.