关键词: 低品位微细粒铁矿石, 高效选矿工艺, 阶段磨选

Abstract: There is an iron ore contains 31.92% iron and 46.44% SiO₂ from abroad.Mineral dissemination of the ore is microfine.Beneficiation test was conducted in order to provide a high efficiency beneficiation process by which qualified iron concentrate can be obtained while in the coarser grinding conditions.The results of small-scale beneficiation test showed that iron concentrate with iron grade above 68% at the grinding fineness of 95% passing 0.043 mm by adopting the process of stage grinding-LIMS-column separator separation，but iron concentrate with iron grade above 68% at the grinding fineness of 90% passing 0.076 mm by adopting the process of stage grinding-LIMS-reverse flotation，moreover can reduce above 45% ore quantity for the third grinding.The results of the pilot-scale test showed that iron concentrate with iron grade of 68.12%，content of 4.59%，iron recovery of 70.02%，magnetic iron recovery of 96.83% can be obtained via two stages grinding(90% passing 0.076 mm)-LIMS-reverse flotation-dehydration and regrinding(95% passing 0.038 mm) for flotation tailings-LIMS-reverse flotation process.High efficient separation was achieved on the ore.

Key words: Fine low-grade iron ore, High efficiency beneficiation process, Stages grinding-stages separation