贵州某高铝硅赤铁矿石选矿试验

贵州某贫赤铁矿石属典型的高硅铝、低硫磷赤铁矿石，铁矿物嵌布粒度微细，常规选矿工艺难以获得合格铁精矿。为开发利用该大型贫赤铁矿石资源，对该矿石进行了选择性絮凝沉降脱泥-反浮选提铁降杂试验研究。结果表明，在磨矿细度为-0.045 mm占88%的情况下，经2次絮凝沉降脱泥，1粗1精1扫、中矿顺序返回闭路反浮选流程处理，可获得铁品位为61.20%，SiO₂和Al₂O₃含量分别为6.30%和2.58%，铁回收率为66.48%的铁精矿，该流程与常规还原焙烧-弱磁选流程比较，具有显著的流程简单、能耗和生产成本低的特点。

Beneficiation Experiment of a High Aluminum and Silicon Hematite Ore from Guizhou

The low grade hematite ore from Guizhou is a typical high Al-Si and low S-P hematite.It is difficult to obtain qualified iron concentrate by conventional beneficiation methods due to fine disseminated iron minerals in the ore.Beneficiation experiment of selective flocculation-reverse flotation was carried out on the ore with the purpose of better developing and utilizing the resources.The results showed that with the grinding fineness of 0.045 mm 88% passing，iron concentrate with Fe grade of 61.20%，SiO₂ content of 6.30 %，Al₂O₃ content of 2.58 %，and iron recovery of 66.48 % was obtained with the closed-circuit reverse flotation process of one roughing-one cleaning-one scavenging-middles back to the flow-sheet in turn after secondary flocculating sedimentation.Compared with the conventional flow-sheet of reduction roasting-magnetic separation，this process has the significant advantages as simple flow，low energy consumption and low production costs.