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    METHOD FOR MANUFACTURING LOW-PHOSPHOROUS MOLTEN IRON
    4.
    发明公开
    METHOD FOR MANUFACTURING LOW-PHOSPHOROUS MOLTEN IRON 审中-公开

    公开(公告)号：EP4212637A1

    公开(公告)日：2023-07-19

    申请号：EP21866515.6

    申请日：2021-08-23

    申请人： JFE Steel Corporation

    发明人： ODA, Nobuhiko ,  TANNO, Masanori ,  YAMADA, Rei

    IPC分类号： C21C5/52 ,  C21C1/02 ,  C21C5/54

    摘要： Proposed is a method for efficiently manufacturing low-phosphorus molten steel by use of a steelmaking electric furnace, in which slag resulting from melting a solid iron source is effectively separated from molten steel, and thus a unit consumption of lime required to reduce a phosphorus content in the molten steel is reduced. The method for manufacturing low-phosphorus molten steel includes: a first step of charging a solid iron source and an optional molten iron source and melting and heating these raw materials by using electric energy; a second step of partly or entirely removing slag generated during the melting; a third step of, after the second step, performing dephosphorization by adding dephosphorization flux; and a fourth step of tapping low-phosphorus molten steel thus refined, and in the method, a slag composition ratio C/(S + A) of the slag to be removed in the second step is adjusted to be in a range of not less than 0.25 and not more than 0.70. Here, the slag composition ratio C/(S + A) is determined by dividing a CaO concentration (C) by a sum of an SiO 2 concentration (S) and an Al 2 O 3 concentration (A) on a mass basis in the slag.

    VERFAHREN ZUR ERZEUGUNG EINER SCHAUMSCHLACKE AUF AUSTENITISCHEN ROSTFREISCHMELZEN IN EINEM ELEKTROLICHTBOGENOFEN
    10.
    发明公开
    VERFAHREN ZUR ERZEUGUNG EINER SCHAUMSCHLACKE AUF AUSTENITISCHEN ROSTFREISCHMELZEN IN EINEM ELEKTROLICHTBOGENOFEN 有权

    公开(公告)号：EP2307580A1

    公开(公告)日：2011-04-13

    申请号：EP09761301.2

    申请日：2009-04-08

    申请人： SMS Siemag Aktiengesellschaft

    发明人： REICHEL, Johann ,  ROSE, Lutz

    IPC分类号： C21C7/00 ,  C21C5/52 ,  C21C5/54

    CPC分类号： C21C5/527 ,  C21C5/54 ,  C21C7/0087 ,  Y02P10/216

    摘要： The invention relates to a process for producing a foamed slag on austenitic stainless melts in an electric arc furnace, wherein a mixture of metal oxides and carbon is introduced into the furnace, underneath the slag and at the metal/slag boundary, the metal oxide is reduced by the carbon and the gases produced bring about the foaming of the slag by the formation of bubbles. Here, the mixture to be charged, which is added in the form of mouldings such as briquettes or pellets, contains not only nickel oxide, iron oxide, iron carriers and carbon but also the required binders.

    摘要翻译： 一种在电弧炉中在奥氏体不锈钢熔体上生产泡沫炉渣的方法。 将金属氧化物和碳的混合物引入炉中，在金属/渣界面处，金属氧化物被渣下方的碳还原，并且所产生的气体通过气泡形成引起炉渣的起泡。 以预制品形式加入的装料混合物，例如块状或粒状，除了氧化镍之外，还含有氧化铁，铁载体，碳和所需的粘合剂。