Roasting-magnetic Separation and Direct Reduction of a Refractory Oolitic-hematite Ore
Roasting-magnetic Separation and Direct Reduction of a Refractory Oolitic-hematite Ore
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发表时间：
2008
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通讯作者：
Shen Hui-ting
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作者：
Shen Hui-ting
摘 要：在实验室条件下采用焙烧磁选法和直接还原法处理某鲕状赤铁矿，分别生产磁铁精矿和海绵铁，考察了还原时间、温度、还原剂用量等工艺参数对两种工艺的影响。结果表明，以无烟煤为还原剂，磁选可得到铁品位为61.60%、回收率为96.65%的磁铁矿精矿。 850℃预焙烧45分钟。同时，以无烟煤和碳酸钙混合物为还原剂，将矿石直接在1050℃预还原5小时磁选，可得到品位89%、金属化率90%、回收率85%的海绵铁。
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 1050 ℃ for 5 hours with the mixture of anthracite and calcium carbonate as reductants.