关键词: 难选铁矿石, 褐煤, 无烟煤, 直接还原焙烧, 助熔剂

Abstract: Under different roasting temperature, reduction agent dosage, roasting time, fluxing agent and different grinding fineness, and taking the lignite coal (C1) and fluxing coal (C2) as reduction agents, the effects of different coal types on direct reduction roasting and magnetic separation were investigated. The results showed that the reduction effect of C2 was better than that of C1 without addition of the fluxing agents. The fluxing agent can improve the effect of direct reduction, especially for C1. With the addition of fluxing agents, DRI (Direct Reduced Iron) of 90.32% and 90.34% can be obtained by C1 and C2 respectively, while the recovery with C1 is higher by 5.30% up to be 80.66% than that of C2. Even, C1 costs less than C2, so the coal C1 is more beneficial to the reduction of iron ore.

Key words: Refractory iron ore, Lignite, Anthracitic coal, Direct reduction roasting, Fluxing agent