| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a refining method for highly efficiently and stably performing desulfurization in a simpler and easier manner, without using an LF apparatus or vacuum degassing apparatus having high equipment cost and high treating cost and without adversely affecting environment. <P>SOLUTION: When molten iron is desulfurization-refined, in the first process, the molten iron is desulfurized by adding a desulfurizing agent thereto and in the second process a part or the whole of desulfurization slag generated at the first process and covering the molten iron surface is left, and oxygen gas or inert gas containing ≥81 vol% the oxygen gas is blown from above the left desulfurizationis slag, and S concentration in the molten iron after the second process is set to be lower than the S concentration after the first process, and further in the third process succeeding to the second process, the molten iron and the slag are deoxidized with a deoxidizing agent. Furthermore, as the desulfurizing agent, flux substantially containing no fluorine is used. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
