Iron tailings is the most common and largest mining waste, and given the serious social, economic, and environmental impacts caused by tailings, green and safe technologies are urgently needed for the efficient treatment of tailings. In the present work, efficient extraction of iron from flotation tailings via the suspension magnetization roasting and magnetic separation has been demonstrated as a promising way to reduce emissions and extracting iron from flotation tailings. The possibility of iron extraction from flotation tailing containing 21.86% iron and transformation mechanism were studied in a pilot-scale experiment. The results revealed that an iron concentrate having an iron grade of 66.51% and iron recovery of 72.90% could be obtained under the following conditions: roasting temperature of 470 °C, reductant concentration of 30%, reductant ratio of 1:1 (CO: H₂), and total gas flow of 16.0 m³/h. The mineralography and magnetic performance of the preconcentration concentrate, roasted product, magnetic concentrate, and magnetic tailings were studied by X-ray diffraction, iron chemical phase analysis, and the vibrating sample magnetometer. The effect of roasting on the microstructure of the products was also analyzed by scanning electron microscopy and laser particle size analysis to help understand the mechanism.

铁尾矿是最常见、规模最大的矿山废弃物，尾矿对社会、经济和环境造成严重影响，迫切需要绿色安全的尾矿高效处理技术。在目前的工作中，通过悬浮磁化焙烧和磁选从浮选尾矿中有效提取铁已被证明是减少排放和从浮选尾矿中提取铁的有前途的方法。中试研究了含铁21.86%的浮选尾矿提铁的可能性及转化机理。结果表明，在以下条件下可以得到铁品位为66.51%，铁回收率为72.90%的铁精矿：焙烧温度470℃，还原剂浓度30%，₂ )，总气体流量为16.0 m ³ /h。通过X射线衍射、铁化学物相分析和振动样品磁强计研究了预浓缩精矿、焙烧产品、磁性精矿和磁性尾矿的矿物学和磁性能。还通过扫描电子显微镜和激光粒度分析来分析焙烧对产品微观结构的影响，以帮助理解其机制。