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公开(公告)号：US20220389527A1
公开(公告)日：2022-12-08
申请号：US17775502
申请日：2020-11-11
发明人： Koji TOKUDA , Tsuyoshi MIMURA
摘要： In a method for producing a molten steel according to one aspect of the present invention, the solid-state direct reduced iron contains 3.0% by mass or more of SiO2 and Al2O3 in total and 1.0% by mass or more of carbon. A ratio of a metallic iron to the total iron content contained in the solid-state direct reduced iron is 90% by mass or more, and an excess carbon content Cx is 0.2% by mass or more to the carbons contained in the solid-state direct reduced iron. The method includes a step in a first furnace of melting 40 to 100% by mass of the solid-state direct reduced iron, and separating a molten pig iron having a carbon content of 2.0 to 5.0% by mass and a temperature of 1350 to 1550° C. and a slag having a basicity of 1.0 to 1.4 and a step in a second furnace of melting a remainder of the solid reduced iron together with the molten pig iron separated in the first furnace and blowing oxygen onto the molten material to decarburize into a molten steel.
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公开(公告)号：US20150322542A1
公开(公告)日：2015-11-12
申请号：US14650376
申请日：2014-01-30
发明人： Shoichi KIKUCHI , Tsuyoshi MIMURA , Takao HARADA , Shingo YOSHIDA
CPC分类号： C22B7/02 , C21B13/0046 , C21B13/105 , C22B1/24 , C22B1/245 , C22B5/10 , Y02P10/216
摘要： 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.
摘要翻译： 提供了提高还原铁产率的技术，从而通过加热附聚物制造还原铁来提高生产率。 制造还原铁的方法包括：混合物凝聚的步骤，所述混合物含有含氧化铁物质，碳质还原剂和熔点调节剂; 并且通过加热获得的附聚物来制造还原铁，还原和部分熔融附聚物中的氧化铁并使铁组分聚集的步骤。 在制造还原铁的步骤中产生的微细铁粒子的粒径被调节，细粒铁混合在混合物中。
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公开(公告)号：US20220396844A1
公开(公告)日：2022-12-15
申请号：US17777071
申请日：2020-12-11
发明人： Koji TOKUDA , Tsuyoshi MIMURA
摘要： A method for producing a molten steel may provide: solid-state direct reduced iron containing 3.0% by mass or more of SiO2 and Al2O3 in total and 1.0% by mass or more of carbon, a ratio of a metallic iron to a total iron content contained in the solid-state direct reduced iron being 90% by mass or more, and an excess carbon content Cx to the carbon contained in the solid-state direct reduced iron being 0.2% by mass or more. Such methods may include: a slag separation including heating the solid-state direct reduced iron and melting it in an electric furnace without introducing oxygen to separate into a molten steel and a slag, and continuously discharging the slag, and a decarburization including blowing, in the electric furnace, a total amount of oxygen introduced into the electric furnace to the molten steel to decarburize the molten steel after the slag separation.
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