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从粗粒结晶结构、颗粒具自由界面、含杂质甚少的磁铁矿或赤铁矿中,生产含硅量低的超级精矿时,有时只要采用多段磁选和分级流程就足够了。磁铁石英岩和磁铁矿铁燧岩矿石的特点是矿石和岩石嵌布粒度极细,因此欲使它们解离,须磨至—44μm;在某些情况下,须磨至—28μm。在美国和加拿大的大多数选矿厂,处理这些矿石时,采用具有虹吸管排矿方式的水力分级机和水力分选机以排除细粒岩泥,而用细筛脱除粗粒脉石矿物。但精选细磨精矿较有效的方法是阳离子反浮选,
From the coarse-grained crystal structure, the particles have free interfaces, and the magnetite or hematite with little impurities produce super-concentrates with a low silicon content, sometimes only a multistage magnetic separation and fractionation process is sufficient. Magnet Quartzite and Magnetite The taconite ore is characterized by its extremely fine grain size of ores and rocks, so it is necessary to mill to -44 μm in order to dissociate them; in some cases it should be ground down to -28 μm. At most processing plants in the United States and Canada, when processing these ores, hydraulic stencils and hydraulic separators with siphon drainage are used to remove fine-grained mud and fine-grained to remove coarse-grained gangue minerals. However, the selection of fine grinding concentrate more effective method is cationic anti-flotation,