| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing reduced iron having high crushing strength. SOLUTION: In producing the reduced iron by charging an agglomerate containing iron oxide-containing material and a carbonaceous reducing agent into a heating furnace and heating the agglomerate and reducing the iron oxide in the agglomerate, the method for producing the reduced iron includes: a step where the agglomerate having 0.5-0.9 basicity (ratio of CaO/SiO2) is charged into the heating furnace and intermediate reduced iron having≥50% (not including 100%) metallization rate and≤5.5 mass% total carbon content, and being heated to 1,100-1,200°C, is obtained; and a step where the obtained intermediate reduced iron is heated to the arrival temperature T set in the temperature range of 1,250-1,350°C at the average temperature rising velocity V of 30-70°C/min. COPYRIGHT: (C)2013,JPO&INPIT |
