Fluidized bed type reduction apparatus for iron ores and method for
reducing iron ores using the apparatus
    1.
    发明授权
    Fluidized bed type reduction apparatus for iron ores and method for reducing iron ores using the apparatus 失效
    用于铁矿石的流化床型还原装置和使用该装置还原铁矿石的方法

    公开(公告)号:US5762681A

    公开(公告)日:1998-06-09

    申请号:US696973

    申请日:1996-10-28

    摘要: A three-stage, fluidized-bed-type reduction apparatus and a method for using it for reducing fine iron ores of wide size ranges, improving the gas utilization and reduction degree, reducing the residence time of iron ores, and increasing the prereduction rate of reduced iron. The apparatus includes serially arranged a drying/preheating furnace with a first cyclone connected to it, a primary prereduction furnace with a second cyclone connected to it, a secondary high-gas-velocity reduction furnace for finally reducing only a coarse ore portion of the prereduced iron ores at a bubbling fluidized state while carrying over the medium/fine ore portion of the iron ores, a secondary low-gas-velocity reduction furnace for finally reducing the medium/fine ores forming a bubbling fluidized bed thereof, an inner cyclone installed in the secondary low-gas-velocity reduction furnace, and a third cyclone for capturing dusty ores not captured by the inner cyclone.

    摘要翻译: PCT No.PCT / KR95 / 00181 Sec。 371日期1996年10月28日第 102(e)日期1996年10月28日PCT提交1995年12月28日PCT公布。 公开号WO96 / 21044 日期1996年7月11日三级流化床型还原装置及其用于还原大范围铁矿石的方法,提高气体利用和还原度,减少铁矿石的停留时间,以及 增加还原铁的预还原率。 该装置包括串联地布置有与其连接的第一旋流器的干燥/预热炉,具有与其连接的第二旋风分离器的初级预还原炉,用于最终仅还原预还原的粗矿石部分的二次高速气体还原炉 铁矿石在鼓泡流化状态下,同时承载铁矿石的中/细矿石部分,二次低气速降低炉,用于最终还原形成其起泡流化床的中/细矿石,内旋风安装在 第二低速气体还原炉和用于捕获未被内旋风分离器捕获的多尘的矿石的第三旋风分离器。

    Fluidized bed type reduction apparatus for iron ore particles and method
for reducing iron ore particles using the apparatus
    2.
    发明授权
    Fluidized bed type reduction apparatus for iron ore particles and method for reducing iron ore particles using the apparatus 失效
    用于铁矿石颗粒的流化床型还原装置和使用该装置还原铁矿石颗粒的方法

    公开(公告)号:US5785733A

    公开(公告)日:1998-07-28

    申请号:US702517

    申请日:1996-10-28

    IPC分类号: C21B11/00 C21B13/00 C21B13/14

    摘要: A reduction apparatus and a method for efficient reduction of fine iron ores of wide grain range comprising serially arranged a drying/preheating furnace, a first reducing furnace for prereduction and a second reduction furnace for final reduction, each working with bubbling fluidized bed and being connected each to a cyclone for capturing iron ore dust contained in the exhaust gases, having each a tapered shape smoothly expanded outwards and thus considerably decreasing elutriation of fine particles, increasing the reduction efficiency and enhancing the utilization of the reducing gas.

    摘要翻译: PCT No.PCT / KR95 / 00182 Sec。 371日期1996年10月28日第 102(e)日期1996年10月28日PCT提交1995年12月28日PCT公布。 出版物WO96 / 21045 日期:1996年7月11日一种用于有效还原宽晶粒范围的细铁矿的还原装置和方法,包括串联布置的干燥/预热炉,用于预还原的第一还原炉和用于最终还原的第二还原炉,每个都用起泡 流化床并且各自连接到旋风分离器,用于捕获废气中含有的铁矿石粉尘,每个锥形形状向外平滑地膨胀,从而大大减少细颗粒的淘析,从而提高还原效率并增强还原气体的利用。