梅山铁尾矿强磁再选粗精矿深度还原试验

Research on Deep Reduction of Reelection Coarse Concentrate After High Intensity Magnetie Separation of Meishan Iron Tailings

由于梅山铁矿石中弱磁性铁矿物含量很高,导致梅山尾矿的铁品位较高。梅山铁矿选矿厂对该尾矿进行了强磁再选,获得了铁品位为31.80%的再选粗精矿。为获得合格的铁产品,东北大学对该再选粗精矿进行了深度还原工艺技术条件研究,结果表明,在还原温度为1 275℃,还原时间为60 min,料层厚度为30 mm,配碳系数为2.0,煤粉粒度为-2.0 mm情况下进行深度还原,金属化率为89.20%的还原物料经1段弱磁选可获得铁品位为80.05%、回收率为98.03%的弱磁选铁粉。

Iron content of Meishan tailings is relatively high,because of high content of weakly magnetic iron minerals in Meishan iron ore.These tailings were treated by Meishan iron concentrator using high intensity magnetic separation,and re-concentrate with 31.80% iron grade were produced.Then deep reduction was used to treat reelection coarse concentrate.The results show that the reduced materials with metallization rate up to 89.20% was obtained under the optimal deep reduction conditions such as reducing temperature 1 275 ℃,reducing time 60 min,thickness of material 30 mm and carbon coefficient 2.0.Iron powder with a TFe grade 80.05% at an iron recovery 98.03% was achieved after one-stage low intensity magnetic separation.