关键词: 高铝硅赤铁矿, 选择性絮凝, 反浮选

Abstract: 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.

Key words: High aluminum and silicon hematite ore, Selective flocculation, Reverse flotation