| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for producing molten steel by which in production of the molten steel using iron-scrap and blast furnace molten iron together, electric power consumption is reduced by efficiently melting the iron-scrap and at the same time, steel coming up to a high-class steel produced by a blast furnace-converter method can be produced by decreasing the concentration of impurities such as Cu mixed from the scraps as much as possible. <P>SOLUTION: The method for producing the molten steel is characterized in that the method is carried out using an arc-furnace provided with a melting chamber and a shaft type preheating chamber which is directly connected with the melting chamber and into which exhaust gas generated in the melting chamber is introduced, and that the blast furnace molten iron is directly charged into the melting chamber and also, while continuously or intermittently charging the iron-scrap into the preheating chamber so as to keep a state where the iron-scrap is present continuously in the preheating chamber and the melting chamber, the iron-scrap and the blast furnace molten iron in the melting chamber are heated with arc and the iron-scrap is melted to tap off the molten metal, then after mixing at least a part of the molten metal with the blast furnace molten iron thereby desulfurizing the molten metal, the molten metal is refined in a converter to obtain the molten steel. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
