| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for recovering chromium in slag by which chromium oxide contained in the slag developed when molten stainless steel is subjected to decarburization refining, is efficiently reduced and recovered in the molten stainless steel and the lowering of the chromium contained in the slag is performed and the recycling of the slag can be realized by improving powdering caused by expansion. SOLUTION: The method for recovering the chromium oxide in the slag 15 into molten iron 16 by applying reduction treatment, is performed by tapping the slag 15 developed when the molten stainless steel is subjected to the decarburization refining by using a refining furnace, into a ladle 11 charged with the molten iron 16 beforehand undergoing a pretreatment, such as dephosphorization, and heating up. The temperature of the slag 15 at the reduction-treatment is set to 1,500-1,700 deg.C, and a liquid phase ratio of the slag 15 at the end stage of the reduction is set to >=80% and the total concentration of Al2O3 and MgO contained in the slag 15 is set to 20-60 wt.%.</p> |
