| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a refining method for highly efficiently and stably performing desulfurization treatment in a simpler manner without using an LF apparatus and a vacuum-degassing apparatus having high equipment cost and high treatment cost and without adversely affecting environment. <P>SOLUTION: In desulfurization refining of molten iron, hydrogen gas or inert gas containing≥30 vol.% hydrogen gas is blown from above desulfurization slag covering the molten iron surface, while performing desulfurization by adding an desulfurizing agent to the molten iron. In another embodiment, in the first step, the desulfurization is performed by adding the desulfurizing agent and in the second step, a part or the whole of the desulfurization slag covering the molten iron surface in the first step is left, and the hydrogen-containing gas is blown from above the left slag. Blowing the hydrogen-containing gas advances vaporization desulfurization from the desulfurization slag, so that the desulfurization from the molten iron into the slag continues, and excellent desulfurization ability is displayed. Further, as the desulfurizing agent, flux substantially containing no fluorine is used and furthermore, the generated slag is used again as the desulfurizing agent. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
