| 摘要 |
<p>PURPOSE:To easily and economically recover chromium and to obtain a useful slag by applying stirring to the chromium oxide-contg. slag discharged in a molten state and adding a reducing agent of the amt. enough to reduce chromium oxide to said slag. CONSTITUTION:After a stainless steel is refined under the atm. pressure in a converter 1, the molten steel 4 is collected into a ladle 3 and the chromium oxide-contg. slag 5 is discharged in the molten state into a slag pot 2. An inert gas such as Ar or N2 is blown from a lance pipe 6 to the molten slag 5 in the slag pot 2 to stir the molten slag. The reducing agent 8 such as Fe-Si or Al dross is added to the slag 5 simultaneously therewith. The reducing agent 8 is added thereto at the amt. enough to reduce the chromium oxide in the slag 5. The treated matter after the above-mentioned treatment is thereby solidified and the solidified matter is taken out of the slag pot 2. The solidified matter is pulverized and the metal component is fractionated and collected. The chromium component is thereby recovered and the slag contg. the metal oxide at a lower ratio and having the high additive value in terms of utilization is obtd.</p> |
