| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an effective coke adding method for treating dust and/or sludge produced in a stainless steel producing process with an electric furnace. SOLUTION: At the time of executing smelting reduction by briquetting the dust and/or the sludge containing available metals and adding the coke into this briquette, the adding quantity of the coke used to the reduction is adjusted to a quantity corresponding to the coke adding quantity (kg/T-dust, sludge) of 0.75-0.90 calculated by A [ 2.6(%total Fe/0.7773)+3.3 (%Cr2 O3 )+2.9 (%NiO)]. Further, the coke used to the reduction is adjusted so that the total of wt. ratio of each grain size of the coke mixed within the following range becomes 100%. The grain sigz and the blending ratio of the coke are <=10mm at 5-20%, 10-15mm at 35-50%, 15-20mm at 25-40% and >20mm at <=10%, respectively.</p> |
