Ironmaking method
AssigneeNippon Steel Corporation
InventorMoritoshi MIZUTANI
Life of this patent
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Abstract
An ironmaking method includes ore beneficiating a high combined water content iron ore including a loss of ignition of 3 to 12 mass % into a goethite-rich part including at least a loss of ignition of 4 mass % or more and an iron content of 55 mass % or more; agglomerating the goethite-rich part into first fired pellets in a pellet induration furnace; and the first fired pellets into a shaft furnace while the first fired pellets have a surface temperature of 600° C. or higher, and directly reducing the first fired pellets using a reducing gas containing 60 volume % or more of hydrogen.
Claims9
An ironmaking method, comprising:
- a high combined water content iron ore including a loss of ignition of 3 to 12 mass % into a goethite-rich part including at least a loss of ignition of 4 mass % or more and an iron content of 55 mass % or more;
- the goethite-rich part into first fired pellets in a pellet induration furnace;
- and
- charging the first fired pellets into a shaft furnace while the first fired pellets have a surface temperature of 600° C. or higher, and directly reducing the first fired pellets using a reducing gas containing 60 volume % or more of hydrogen.
An ironmaking method, comprising:
- an ore beneficiation step in which a high combined water content iron ore including a loss of ignition of 3 to 12 mass % is beneficiated into a goethite-rich part including at least a loss of ignition of 4 mass % or more and an iron content of 55 mass % or more;
- a first agglomeration processing step in which the goethite-rich part is agglomerated into first fired pellets in a pellet induration furnace;
- and
- a first reduction step in which the first fired pellets are charged into a shaft furnace while the first fired pellets have a surface temperature of 600° C. or higher, and directly reduced using a reducing gas containing 60 volume % or more of hydrogen.
Dependencies are inferred from the claim text.