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US 4,225,340 AGranted
Method for the direct reduction of iron using gas from coal
AssigneeMidrex Corporation
InventorsDonald Beggs, John C. Scarlett
Life of this patent
Estimating the term…
Abstract
A method for the direct reduction of iron in which a fossil fuel is gasified to produce a hot gas which is tempered with a cool spent top gas from a reduction furnace, reacted with carbon to upgrade the hot gas in reducing potential, and desulfurized by reaction with lime in a first shaft furnace to form a hot reducing gas. The hot reducing gas is utilized as the reductant in a counterflow shaft reduction furnace and the spent reducing gas is recycled as tempering gas for the hot gas from the hot gasifier.
Claims8
A method for reducing iron oxide comprising:
- a. gasifying fossil fuel to produce a hot gasifier gas;
- b. tempering said hot gasifier gas with clean, cool spent top gas from a direct reduction furnace to form a hot gas mixture;
- c. reacting said hot gas mixture with carbon and a sulfur acceptor to upgrade the quality of the mixture, to desulfurize the mixture, and to form a hot reducing gas;
- and
- d. introducing the hot reducing gas into a direct reduction furnace, reducing the iron oxide therein to a highly metallized product, and forming a CO.sub.2 -containing top gas.
2 more elements
Dependencies are inferred from the claim text.