| 摘要 |
PROBLEM TO BE SOLVED: To more efficiently remove impurities by promoting a demanganization reaction while suppressing the increase of the quantity of an iron oxide to a minimal value. SOLUTION: This method for removing impurities comprises steps of: dividing a mixed raw material group including a plurality of iron-base raw materials into a first raw material group G1 with a mass of Ma, in which a mass content ratio Ea of silicon to manganese satisfies Ea≤1.5, and a second raw material group G2 with a mass of Mb, in which a mass content ratio Eb of silicon to manganese satisfies Eb>Ea and also the mass Mb satisfies Mb≤1.5Ma; melting the first raw material group G1 at first; adding an iron oxide to the molten cast iron to float up slag to the surface of the molten metal; subsequently adding the second raw material group G2 to the molten metal of the first raw material group G1; and melting the second raw material group G2 together with the first raw material group G1 to float up the slag to the surface of the molten cast iron again. COPYRIGHT: (C)2008,JPO&INPIT
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