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    Iron production method of operation in a rotary hearth furnace and improved furnace apparatus
    2.
    发明授权
    Iron production method of operation in a rotary hearth furnace and improved furnace apparatus 有权
    在转炉炉中操作的铁生产方法和改进的炉装置

    公开(公告)号：US06413295B2

    公开(公告)日：2002-07-02

    申请号：US09266989

    申请日：1999-03-12

    申请人： David C. Meissner ,  Glenn E. Hoffman ,  Kyle J. Shoop ,  Takuya Negami ,  Akira Uragami ,  Yasuhiro Tanigaki ,  Shuzo Ito ,  Isao Kobayashi ,  Osamu Tsuge ,  Koji Tokuda ,  Shoichi Kikuchi

    发明人： David C. Meissner ,  Glenn E. Hoffman ,  Kyle J. Shoop ,  Takuya Negami ,  Akira Uragami ,  Yasuhiro Tanigaki ,  Shuzo Ito ,  Isao Kobayashi ,  Osamu Tsuge ,  Koji Tokuda ,  Shoichi Kikuchi

    IPC分类号： C21B1310

    CPC分类号： C21B13/10 ,  C21B13/105 ,  Y02P10/136

    摘要： The present invention is an apparatus and method for the direct reduction of iron oxide utilizing a rotary hearth furnace to form a high purity carbon-containing iron metal button. The hearth layer may be a refractory or a vitreous hearth layer of iron oxide, carbon, and silica compounds. Additionally, coating materials may be introduced onto the refractory or vitreous hearth layer before iron oxide ore and carbon materials are added, with the coating materials preventing attack of the molten iron on the hearth layer. The coating materials may include compounds of carbon, iron oxide, silicon oxide, magnesium oxide, and/or aluminum oxide. The coating materials may be placed as a solid or a slurry on the hearth layer and heated, which provides a protective layer onto which the iron oxide ores and carbon materials are placed. The iron oxide is reduced and forms molten globules of high purity iron and residual carbon, which remain separate from the hearth layer. An improved apparatus includes a cooling plate that is placed in close proximity with the refractory or vitreous hearth layer, cooling the molten globules to form iron metal buttons that are removed from the hearth layer. The improvements due to the present apparatus and method of operation provide high purity iron and carbon solid buttons, which are separate from slag particulates, and discharged without significant loss of iron product to the interior surfaces of the furnace.

    摘要翻译： 本发明是利用旋转炉床炉直接还原氧化铁以形成高纯度含碳铁金属按钮的装置和方法。 炉床层可以是氧化铁，碳和二氧化硅化合物的耐火材料或玻璃质炉床层。 此外，在添加氧化铁矿石和碳材料之前，可以将涂层材料引入耐火玻璃炉床层，涂层材料防止炉底层上的铁水的侵蚀。 涂层材料可以包括碳，氧化铁，氧化硅，氧化镁和/或氧化铝的化合物。 涂层材料可以作为固体或浆料放置在炉床层上并被加热，这提供了氧化铁矿石和碳材料放置在其上的保护层。 氧化铁被还原，形成高纯铁和剩余碳的熔池，它们与炉底层分开。 一种改进的装置包括一个靠近耐火玻璃炉底层放置的冷却板，冷却熔池以形成从炉床层去除的铁金属纽扣。 由于本设备和操作方法的改进提供了与炉渣微粒分离的高纯度铁和碳固体按钮，并且在铁的内表面没有显着损失的铁排出。

    Method of producing iron nuggets
    3.
    发明授权
    Method of producing iron nuggets 有权

    公开(公告)号：US06592649B2

    公开(公告)日：2003-07-15

    申请号：US09892546

    申请日：2001-06-28

    申请人： Shoichi Kikuchi ,  Yasuhiro Tanigaki ,  Koji Tokuda ,  Osamu Tsuchiya ,  Shuzo Ito

    发明人： Shoichi Kikuchi ,  Yasuhiro Tanigaki ,  Koji Tokuda ,  Osamu Tsuchiya ,  Shuzo Ito

    IPC分类号： C21B1100

    CPC分类号： C21B13/10 ,  C21B13/105 ,  Y02P10/136 ,  Y02P10/216

    摘要： The present invention provides a method of producing metallic iron nuggets with a high yield and good productivity, and more particularly a method which can produce metallic iron nuggets which have a high Fe purity and are excellent in transporting and handling due to a large grain diameter with a high yield and good productivity, when they are produced by reducing and melting raw material containing iron oxide such as iron ore and carbonaceous reducing agent such as coke. The method of producing metallic iron nuggets comprises steps of: heating raw material containing carbonaceous reducing agent and iron oxide-containing material in a reducing/melting furnace, reducing iron oxide in the raw material, and then heating and melting the metallic iron produced by the reduction and simultaneously making it coalesce while separating the metallic iron nuggets from slag components characterized in that the fixed carbon content ratio as the carbonaceous reducing agent is at least 73% and the volatile matter content in the raw material is not more than 3.9% are used, and the mixing content of carbonaceous reducing agent is restrained to be not more than 45% in relation to the iron oxide components, which is contained in the iron oxide-containing material of the raw material.