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公开(公告)号：US20150027275A1
公开(公告)日：2015-01-29
申请号：US14377373
申请日：2013-02-28
Inventor： Shoichi Kikuchi , Takao Harada , Shingo Yoshida
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。
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公开(公告)号：US10683562B2
公开(公告)日：2020-06-16
申请号：US15577151
申请日：2016-04-26
Applicant: Kobe Steel, Ltd.
Inventor： Yui Hosono , Masaki Shimamoto , Takao Harada , Shingo Yoshida , Shoichi Kikuchi , Taiji Hatakeyama
Abstract: The reduced iron manufacturing method of the present invention includes preparing an agglomerate by agglomerating a mixture containing an iron oxide-containing substance and a carbonaceous reducing agent, and preparing reduced iron by heating the agglomerate to reduce iron oxide in the agglomerate, characterized in that Expression (I) as follows is satisfied: Cfix×Xunder105/OFeO≤51 (I) where OFeO is the mass percentage of oxygen contained in the iron oxide in the agglomerate, Cfix is the mass percentage of total fixed carbon contained in the agglomerate, and Xunder105 is the mass percentage of particles having a particle diameter of 105 μm or less with respect to the total mass of particles configuring the carbonaceous reducing agent.
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公开(公告)号：US10017836B2
公开(公告)日：2018-07-10
申请号：US14650376
申请日：2014-01-30
Applicant: Kobe Steel, Ltd.
Inventor： Shoichi Kikuchi , Tsuyoshi Mimura , Takao Harada , Shingo Yoshida
CPC classification number: C22B7/02 , C21B13/0046 , C21B13/105 , C22B1/24 , C22B1/245 , C22B5/10 , Y02P10/216
Abstract: Provided is a technique for increasing the yield of reduced iron, thereby improving productivity when manufacturing reduced iron by heating an agglomerate.This method for manufacturing reduced iron includes: a step in which a mixture is agglomerated, said mixture containing an iron oxide-containing substance, a carbonaceous reducing agent, and a melting point regulator; and a step in which reduced iron is manufactured by heating the obtained agglomerate, reducing and partially melting the iron oxide in the agglomerate, and aggregating the iron component. The particle size of the fine particulate iron generated in the step in which the reduced iron is manufactured is adjusted, and the fine particulate iron is blended into the mixture.
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公开(公告)号：US10144981B2
公开(公告)日：2018-12-04
申请号：US14377373
申请日：2013-02-28
Applicant: Kobe Steel, Ltd.
Inventor： Shoichi Kikuchi , Takao Harada , Shingo Yoshida
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.
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