公开(公告)号：US5919282A

公开(公告)日：1999-07-06

申请号：US817484

申请日：1997-04-17

申请人： Yosuke Hoshijima ,  Kazuo Oonuki ,  Kazuhisa Fukuda ,  Masao Iguchi ,  Hidekazu Kakizoe ,  Hiroki Gofuku ,  Hiroshi Nagahama ,  Hiroaki Yamamoto

发明人： Yosuke Hoshijima ,  Kazuo Oonuki ,  Kazuhisa Fukuda ,  Masao Iguchi ,  Hidekazu Kakizoe ,  Hiroki Gofuku ,  Hiroshi Nagahama ,  Hiroaki Yamamoto

IPC分类号： C21C7/10

CPC分类号： C21C7/10

摘要： In a process for vacuum refining a molten steel wherein a refining flux is used, a fuel gas and an oxygen gas are spouted into the outlet of a top-blown lance of a vacuum refining apparatus to form a burner flame below the top-blown lance, and, at the same time, a refining flux is fed into the top-blown lance with the aid of an oxygen gas as a carrier gas and further passed through the burner flame, and the heated and melted refining flux is allowed to arrive at the surface of the molten steel. In this case, the refining flux feed rate and the circulating flow rate of the molten steel during vacuum refining are regulated so as to have a predetermined relationship, achieving a low flux consumption throughout a period of single refractory life of the vacuum tank.

公开(公告)号：US20100218646A1

公开(公告)日：2010-09-02

申请号：US12682935

申请日：2008-10-16

申请人： Hiroki Gofuku ,  Yuki Kuwauchi ,  Wataru Nagai ,  Kazuhisa Fuxuda ,  Takashi Sawai

发明人： Hiroki Gofuku ,  Yuki Kuwauchi ,  Wataru Nagai ,  Kazuhisa Fuxuda ,  Takashi Sawai

IPC分类号： C22B5/18 ,  C22B1/14 ,  C22B7/00

CPC分类号： C22B7/02 ,  C21B13/0046 ,  C21B13/105 ,  C21B13/143 ,  C21C5/38 ,  C22B1/245 ,  C22B1/248 ,  C22B5/10 ,  Y02P10/216

摘要： A producing method of direct reduced iron includes the steps of: drying an oxidized iron raw material selected from a group including iron ore and iron-making dust generated in an iron-making process to have a predetermined moisture content; mixing the oxidized iron raw material subjected to the drying step and a reducing material having a predetermined moisture content to obtain a mixture; pulverizing the mixture obtained in the mixing step for 80% minus-sieve to have a particle diameter of 70 μm to 500 μm; kneading the mixture after the moisture content of the mixture subjected to the pulverizing step is adjusted; agglomerating the mixture subjected to the kneading step to be agglomerate; and reducing the agglomerate obtained in the agglomerating step by a rotary hearth furnace to generate direct reduced iron.

摘要翻译： 直接还原铁的制造方法包括以下步骤：将选自铁矿石中的氧化铁原料和在制铁过程中产生的铁制粉尘干燥以具有预定的水分含量; 将经过干燥步骤的氧化铁原料和具有预定水分含量的还原材料混合，得到混合物; 将混合工序中得到的混合物粉碎80％的负筛子，使其粒径为70〜500μm， 调整经过粉碎步骤的混合物的水分含量之后捏合该混合物; 使经过捏合步骤的混合物凝聚成团聚物; 并且通过旋转炉床炉减少在附聚步骤中获得的附聚物以产生直接还原铁。

公开(公告)号：US5413623A

公开(公告)日：1995-05-09

申请号：US111413

申请日：1993-08-25

申请人： Kazuo Oonuki ,  Teruyoshi Hiraoka ,  Hiroshi Nagahama ,  Kazuhisa Fukuda ,  Akira Nobumoto ,  Takahiro Isono ,  Atsumi Yamada ,  Hiroki Gofuku

发明人： Kazuo Oonuki ,  Teruyoshi Hiraoka ,  Hiroshi Nagahama ,  Kazuhisa Fukuda ,  Akira Nobumoto ,  Takahiro Isono ,  Atsumi Yamada ,  Hiroki Gofuku

IPC分类号： C21C7/10 ,  C21C7/00

CPC分类号： C21C7/10

摘要： Molten steel is efficiently vacuum treated in a vacuum treatment vessel provided with a top blow lance capable of injecting oxygen and a gaseous fuel at desired flow rates, respectively, into the molten steel. The blow lance is provided on the top of the vacuum treatment vessel and is supported so as to be freely vertically movable. By spacing the lower end of the top blow lance not more than 2 m from the surface of the molten steel bath and injecting only oxygen onto the molten steel, and spacing the lower end of the top blow lance 1.0 m or more from the surface of the molten steel bath and injecting both oxygen and a gaseous fuel gas onto the molten steel, the temperature of the molten steel is prevented from decreasing during the vacuum treatment and the molten steel is so prevented from depositing on the inside wall of the vacuum treatment vessel. The top blow lance includes an oxygen injection section having a throat and a tapered portion connected to the lower end of the throat, and a plurality of fuel gas supply ports provided in the tapered portion. The throat and tapered portion are coaxial with the axial center line of the lance.

摘要翻译： 熔融钢在真空处理容器中被有效地真空处理，所述真空处理容器设有能够以所需流量将氧气和气体燃料分别注入钢水中的顶吹式喷枪。 吹气枪设置在真空处理容器的顶部，并且被支撑为可自由地垂直移动。 通过将顶吹气枪的下端与钢水表面隔开不超过2米，仅将氧气注入到钢水上，并将顶吹气枪的下端距离表面1.0米以上 钢水浴中并将氧气和气体燃料气体注入到钢水上，防止在真空处理期间钢水的温度降低，从而防止钢水沉积在真空处理容器的内壁上 。 顶吹枪包括具有喉部的氧气注入部分和连接到喉部下端的锥形部分，以及设置在锥形部分中的多个燃料气体供给口。 喉部和锥形部分与矛杆的轴向中心线同轴。

公开(公告)号：US08182575B2

公开(公告)日：2012-05-22

申请号：US12682935

申请日：2008-10-16

申请人： Hiroki Gofuku ,  Yuki Kuwauchi ,  Wataru Nagai ,  Kazuhisa Fukuda ,  Takashi Sawai

发明人： Hiroki Gofuku ,  Yuki Kuwauchi ,  Wataru Nagai ,  Kazuhisa Fukuda ,  Takashi Sawai

IPC分类号： C22B1/16 ,  C21B13/08

CPC分类号： C22B7/02 ,  C21B13/0046 ,  C21B13/105 ,  C21B13/143 ,  C21C5/38 ,  C22B1/245 ,  C22B1/248 ,  C22B5/10 ,  Y02P10/216

摘要： A producing method of direct reduced iron includes the steps of: drying an oxidized iron raw material selected from a group including iron ore and iron-making dust generated in an iron-making process to have a predetermined moisture content; mixing the oxidized iron raw material subjected to the drying step and a reducing material having a predetermined moisture content to obtain a mixture; pulverizing the mixture obtained in the mixing step for 80% minus-sieve to have a particle diameter of 70 μm to 500 μm; kneading the mixture after the moisture content of the mixture subjected to the pulverizing step is adjusted; agglomerating the mixture subjected to the kneading step to be agglomerate; and reducing the agglomerate obtained in the agglomerating step by a rotary hearth furnace to generate direct reduced iron.

摘要翻译： 直接还原铁的制造方法包括以下步骤：将选自铁矿石中的氧化铁原料和在制铁过程中产生的铁制粉尘干燥以具有预定的水分含量; 将经过干燥步骤的氧化铁原料和具有预定水分含量的还原材料混合，得到混合物; 将混合工序中得到的混合物粉碎80％的负筛子，使其粒径为70〜500μm， 调整经过粉碎步骤的混合物的水分含量之后捏合该混合物; 使经过捏合步骤的混合物凝聚成团聚物; 并且通过旋转炉床炉减少在附聚步骤中获得的附聚物以产生直接还原铁。