低品位红土镍矿转底炉煤基直接还原-磁选富集镍铁工艺实验研究

Study on the enrichment of nickel-iron from low-grade laterite nickel ore via rotary hearth furnace coal-based direct reduction-magnetic separation process

研究了低品位红土镍矿转底炉煤基直接还原-磁选富集镍铁工艺,探索了矿煤比、还原温度对镍铁回收率、还原率及金属化率的影响。实验表明:矿煤比100:10、还原温度1200℃、还原时间25min为合适的工艺参数,铁的还原率达99.52%,镍金属化率为54.48%,回收率为87.59%。

The enrichment of nickel-iron from low-grade lateritic nickel ore via RHF coal-based direct reduction and magnetic separation process was researched in this paper. Effects of the mine/coal mass ratio and the reduction temperature on the nickel-iron recovery, reduction rate and the degree of metallization were also studied. The results showed that when the mine/coal mass ratio was 100：10, the reduction temperature kept at 100℃ and the reduction time kept for 4 hours, the iron reduction rate was 99.52%, the degree of nickel metallization was 54.48% and the recovery was 87.59%.