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AssigneeNippon Steel Corporation
InventorsTetsuharu Ibaraki, Takashi Hiromatsu, Satoshi Kondo, Shoji Imura, Yoichi Abe
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The present invention provides a reducing furnace of the rotary hearth-type and a method for reducing a metal oxide simplified in the process from dehydration to molding, according to which a moisture-rich powdery raw material is reduced at low cost. The present invention also provides an operation method whereby dusts or sludge generated in the refining or processing of metal are economically recycled. A powdery mixture having a moisture content of 100% or higher relative to the total mass of a metal oxide-containing powder and a carbon-containing powder is made into a slurry and mixed by stirring. Thereafter, the slurry is dehydrated to a moisture content of 16 to 26% and compression-molded into articles. The cylindrical or granular shaped articles having a thickness or diameter of 30 mm or less thus obtained are fed to a zone the atmospheric temperature of which is 1170° C. or lower in the furnace and reduced through calcination by a rotary hearth reducing furnace thereby to provide a metal.
A facility for reducing a metal oxide, characterized by comprising a compression molding machine for shaping a mixture of a water containing powder containing a metal oxide and a powder containing carbon into a cylindrical or granular shaped article;
A facility for reducing a metal oxide, characterized by comprising a device for mixing a powder containing a metal oxide and a carbon-based powder in a water containing condition;
12-22. (Cancel)
A shaped article of a raw material for use in a reducing furnace, characterized in that the shaped article is a cylindrical or granular shaped article of 30 mm or less formed by dehydrating a powdery mixture containing a metal oxide, carbon, and water to a moisture content of 15 to 30% by mass relative to the whole mixture and then compression-molding said mixture.
A shaped article of a raw material for use in a reducing furnace, characterized in that the shaped article is a cylindrical or granular shaped article with a moisture content of 16 to 26% by mass, a thickness or diameter of 30 mm or less, and a powder filling rate of 0.43 to 0.58 obtained by compression-molding a mixture of a metal oxide-containing powder and a carbon-containing powder.
Dependencies are inferred from the claim text.