公开(公告)号：US20150027275A1

公开(公告)日：2015-01-29

申请号：US14377373

申请日：2013-02-28

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

Inventor： Shoichi Kikuchi ,  Takao Harada ,  Shingo Yoshida

IPC: C21B11/08 ,  C21B3/00

CPC classification number: C21B11/08 ,  B22F9/22 ,  C21B3/00 ,  C21B13/0046 ,  C21B13/105 ,  C22B1/245

Abstract: A process for manufacturing reduced iron agglomerates which comprises introducing starting agglomerates that comprise both an iron oxide-containing material and a carbonaceous reducing agent onto the hearth of a moving-bed heating furnace, and heating the agglomerates to reduce the iron oxide contained in the agglomerates, wherein the iron oxide-containing material contained in the starting agglomerates has a mean particle diameter of 4 to 23 μm and contains at least 18% of particles having diameters of 10 μm or less. By the use of such starting agglomerates, the process attains: an improvement in the yield of reduced iron agglomerates having large particle diameters; a reduction in the manufacturing time, said reduction leading to an enhancement in the productivity; and a remarkable reduction in the content of impurities such as sulfur in the reduced-iron agglomerates.

Abstract translation: 一种制造还原铁附聚物的方法，其包括将包含含铁氧化物的材料和碳质还原剂两者的起始附聚物引入移动床加热炉的炉床上，并加热附聚物以减少附聚物中所含的氧化铁 其中，起始附聚物中含有的含氧化铁的材料的平均粒径为4〜23μm，含有至少18％的直径为10μm以下的粒子。 通过使用这种起始附聚物，该方法得到：具有大粒径的还原铁团块的产率的改善; 减少制造时间，所述减少导致生产率的提高; 还原铁附聚物中的杂质如硫的含量显着降低。