| 摘要 |
<p>PROBLEM TO BE SOLVED: To promote the uniform mixing of a slag and prevent a reduced slag from-powdering by adding an exothermic agent to a molten reduced slag, blowing oxygen thereinto, maintaining the slag in a molten state and keeping a sufficiently good fluidity. SOLUTION: One or more kinds of metallic silicon, metallic aluminum, metallic iron and iron(II) oxide as an exothermic agent are added from a hopper 2 to a reduced slag 4 in a slag vessel 1 housing the reduced slag 4 and an oxygen-containing gas is then blown from lances 3 into the reduced slag 4. A ferrosilicon can be used as the metallic silicon and an Al ingot for deoxidizing a molten steel can be used as the metallic aluminum. Granular iron can be used as the metallic iron and a mill scale can be used as the iron (II) oxide. Industrial oxygen for a pure oxygen top blowing converter can be used as the oxygen-containing gas. The material of the slag vessel 1 is preferably made of cast iron or lined with a refractory. The oxygen is blown in order to oxidize FeO, Fe, Al and Si and suppress the lowering of the stag temperature by the heat of formation of oxides.</p> |
