Browsing by Subject "Magnetic taconite"

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    Iron Ore Beneficiation in the U.S.A.: Past and Future
    (University of Minnesota Duluth, 2000-05-02) Iwasaki, Iwao
    The iron ore mining industry in the U.S. is facing strong competition from high-grade overseas sources. In order for the American iron ore industry to remain competitive, research on low-cost beneficiation methods that ensure high-quality and uniform-quality products must be maintained in order to prepare for evertightening specifications on ironmaking raw materials for blast furnaces and for direct reduction processes. In this article, some of the past developments are reviewed and future prospects are discussed with a special emphasis on flotation technology.
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    Partial Metallization of Coal-Added Pellets for Smelting Reduction
    (University of Minnesota Duluth, 2000-11-14) Iwasaki, Iwao
    In NKK's Duplex-DIOS process, maximum annual productivity is obtained when a DIOS reactor is operated with 30% metallized feed . Laboratory tests were performed to ascertain if 30% metallization could be achieved consistently and with sufficient strength by adding coal less than the stoichiometric requirements. Partially metallized pellets were prepared using an LTV Steel Mining filter cake sample by adding coal in the amount of 35% of the stoichiometric requirements to both unfluxed and fluxed pellets. The optimum temperature of induration was in the range of 1200° to 1300°C. The product analyzed 25 to 30% metallization with compression strengths of 150 to over 300 lb, and apparent densities of 3.4 to 3.5.