| 摘要 |
PROBLEM TO BE SOLVED: To provide a pre-treatment method for molten iron by which fluorine content in every slag produced in an iron-making plant is reduced and is dluted to be made in harmless state. SOLUTION: In the pre-treatment for molten iron, pre-removing silicon, phosphorus and sulfur contained in the molten iron before charging the molten iron 5 into a steelmaking furnace, after desiliconizing and dephosphorizing by blowing a refining agent 2 containing no fluorite into the molten iron held in a torpedo car 6 with carrier gas 12 through a lance 4, the desiliconized and dephosphorized molten iron is shifted to a ladle and desulfurized by mechanically stirring by adding a desulfurizing agent containing the fluorite and also, fluorine-containing slag developed with the desulfurization is used as a part of charging raw material into a blast furnace, and the fluorine in the fluorine-containing slag is diluted and discharged from the blast furnace as the blast furnace slag having≤1000ppm fluorine content. COPYRIGHT: (C)2006,JPO&NCIPI
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