摘要
针对难选鲕状赤铁矿,在实验室条件下采用磁化焙烧-磁选工艺制取铁精矿和直接还原工艺制取海绵铁,研究了还原时间、温度、还原剂用量等对两种焙烧过程的影响。研究结果表明:采用无烟煤作还原剂,在850℃时焙烧45 min的焙烧矿经过磁选后获得铁精矿品位达到61.60%,回收率达到96.65%的较好指标;采用直接还原在环状装料方式下还原焙烧,采用无烟煤和碳酸钙的混合物为还原剂,1 050℃时焙烧5.0 h,经过磁选得到的海绵铁的品位、金属化率和回收率可分别达到了89%、90%和85%。
Roasting-magnetic separation and direct reduction methods were used to treat an oolitic-hematite ore under laboratory conditions to produce magnetite concentrate and sponge iron respectively. The influences of processing parameters such as reduction time, temperature and reductant dosage on both processes were investigated. The results show that, using anthracite as the reductant, a magnetite concentrate with an iron grade of 61.60% and a recovery of 96.65% can be obtained by magnetic separation of the ore pre-roasted at 850℃ for 45 minutes. Meanwhile, a sponge iron with a grade of 89%, a metallization rate of 90% and a recovery of 85% can be obtained from the magnetic separation of ore pre-reducted directly at 1 050℃ for 5 hours with the mixture of anthracite and calcium carbonate as reductants.
出处
《矿冶工程》
CAS
CSCD
北大核心
2008年第5期30-34,43,共6页
Mining and Metallurgical Engineering
关键词
鲕状赤铁矿
焙烧
磁选
直接还原
海绵铁
oolitic-hematite
roasting
magnetic separation
direct reduction
sponge iron
