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    PIG IRON-PRODUCING METHOD AND IRON ORE MATERIAL
    11.
    发明公开
    PIG IRON-PRODUCING METHOD AND IRON ORE MATERIAL 审中-公开

    公开(公告)号：US20240240274A1

    公开(公告)日：2024-07-18

    申请号：US18559427

    申请日：2021-06-21

    申请人： Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)

    发明人： Akito KASAI ,  Masahiro YAKEYA ,  Koji OSUGA

    IPC分类号： C21B5/00

    CPC分类号： C21B5/008

    摘要： A method for producing pig iron using a blast furnace comprising a tuyere, the method including: charging a first layer containing an iron ore material and a second layer containing coke alternately in the blast furnace; and reducing and melting the iron ore material in the stacked first layer while injecting an auxiliary reductant into the blast furnace by hot air blown from the tuyere, in which: the iron ore material contains a plurality of reduced iron molded products obtained by compression molding reduced iron; the reduced iron molded product is in a rectangular shape chamfered in a plan view, having on both faces a bulge resulting from a center portion being thicker than a peripheral portion; and a length ratio of a longer side to a shorter side of the reduced iron molded product in the plan view is less than or equal to 1.5.

    METHOD OF OPERATING AN ELECTRIC ARC FURNACE AND STEEL MILL
    13.
    发明公开
    METHOD OF OPERATING AN ELECTRIC ARC FURNACE AND STEEL MILL 审中-公开

    公开(公告)号：US20240191314A1

    公开(公告)日：2024-06-13

    申请号：US18286667

    申请日：2022-04-20

    申请人： PAUL WURTH S.A.

    发明人： Jan KRULL ,  Katia PAPALIA

    IPC分类号： C21B13/12 ,  C21B13/00 ,  F27B3/22 ,  F27D17/00

    CPC分类号： C21B13/12 ,  C21B13/0006 ,  C21B13/0073 ,  F27B3/22 ,  F27D17/003 ,  C21B2100/80 ,  C21B2300/02

    摘要： The disclosure discloses a method of operating an electric arc furnace, the method comprising capturing, from at least one facility of a steel mill, a heated metallurgical gas comprising water and carbon monoxide; conducting, by a reactor supply line, said metallurgical gas to a reactor; transforming, by a treatment of said metallurgical gas within said reactor, the carbon monoxide and water into hydrogen and carbon dioxide according to a water-gas shift reaction; and subsequently separating said hydrogen by a separation device. The method is characterized in that it further comprises providing an iron-bearing material, which comprises iron mainly in the form of iron oxide, to the electric arc furnace; at least partially melting the iron-bearing material to obtain a molten bath; conducting, by a furnace supply line, said hydrogen to the electric arc furnace, which is arranged downstream of the furnace supply line; and injecting, by a plurality of hydrogen injection devices, said hydrogen into said electric arc furnace, such that said hydrogen reacts as a reducing agent for reducing iron oxide in the molten bath during a smelting operation of the electric arc furnace.

    REDUCED IRON PRODUCTION METHOD AND REDUCED IRON PRODUCTION DEVICE
    14.
    发明公开
    REDUCED IRON PRODUCTION METHOD AND REDUCED IRON PRODUCTION DEVICE 审中-公开

    公开(公告)号：US20240175101A1

    公开(公告)日：2024-05-30

    申请号：US18551597

    申请日：2021-12-03

    申请人： JFE STEEL CORPORATION

    发明人： Koki TERUI ,  Takahide HIGUCHI ,  Tetsuya YAMAMOTO

    IPC分类号： C21B13/02 ,  C21B13/00 ,  C22B1/16

    CPC分类号： C21B13/02 ,  C21B13/0073 ,  C22B1/16

    摘要： Provided is a reduced iron production method that can efficiently produce reduced iron without preheating raw materials. The reduced iron production method includes charging an agglomerate, which is a raw material of reduced iron, into a reducing furnace while introducing a reducing gas, which contains hydrogen as a main component, into the reducing furnace, and reducing iron oxide contained in the agglomerate by the reducing gas to obtain reduced iron, where the agglomerate to be charged into the reducing furnace is an agglomerate that retains heat obtained during its production, and the heat is used in a reduction reaction of the iron oxide.

    METHOD FOR PRODUCING PIG IRON
    16.
    发明公开
    METHOD FOR PRODUCING PIG IRON 审中-公开

    公开(公告)号：US20240167111A1

    公开(公告)日：2024-05-23

    申请号：US18551436

    申请日：2021-05-11

    申请人： Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)

    发明人： Akito KASAI ,  Masahiro YAKEYA

    IPC分类号： C21B5/00

    CPC分类号： C21B5/008 ,  C21B5/001 ,  C21B5/006

    摘要： A method for producing pig iron using a blast furnace containing a tuyere, including stacking a first layer including an iron ore material and a second layer including coke alternately in the blast furnace, charging the coke to a central portion of the blast furnace, and reducing and melting the iron ore material in the first layer while injecting an auxiliary reductant into the blast furnace by hot air blown from the tuyere. In the stacking, the charging of the coke is carried out once or a plurality of times during one charge of stacking a stacking unit composed of one of the first layer and one of the second layer, and a ratio R of a mass (ton/ch) of the coke accumulated in the central portion to a mass of the iron ore material charged in the one charge is greater than or equal to a predetermined value a.