Abstract

Iron ore tailings are industrial solid wastes generated from mineral processing. The disposal of iron ore tailings leads to environmental threat and serious security because of their tiny particle size and large storage. In this paper, suspension magnetization roasting and magnetic separation technology were utilized to recover iron tailings. The results showed that iron concentrates with iron grade of 65.01% and recovery of 89.07% could be obtained under conditions of CO concentration 30%, roasting temperature 520 °C, roasting time 20 min, grinding particle size of roasted products with 94% mass fraction of − 38 μm and magnetic field strength 1800 Oe. The vibration sample magnetometer, X-ray diffraction, specific surface area detector, scanning electron microscope and energy-dispersive spectrometer showed that unit mass magnetic moment, specific magnetization coefficient and saturation value of magnetization intensity of magnetic concentrate were all significantly improved. Weak magnetic iron ore was selectively transformed into strong magnetic magnetite. Compared with raw ore, there was porous and cracked structure on the surface of roasted ore and magnetic concentrate, which was conducive to magnetization reaction, magnetism and phase transformation of iron ore.

中文翻译：

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通过悬浮磁化焙烧和磁选从铁尾矿中有效富集铁精矿

摘要

铁矿石尾矿是矿物加工产生的工业固体废物。铁矿石尾矿的处理由于其微小的粒径和大的储存量而导致环境威胁和严重的安全性。本文采用悬浮磁化焙烧和磁选技术回收铁尾矿。结果表明：在CO浓度为30％，焙烧温度为520°C，焙烧时间为20min，焙烧产物粒度为94％的条件下，可获得铁品位为65.01％，回收率为89.07％的铁精矿。 − 38μm，磁场强度1800 Oe。振动样品磁力仪，X射线衍射仪，比表面积检测仪，扫描电子显微镜和能量色散仪表明，单位质量磁矩，磁精矿的比磁化系数和磁化强度的饱和值均得到明显提高。弱磁性铁矿石被选择性地转化为强磁性磁铁矿。与原矿相比，焙烧矿和磁性精矿表面存在多孔裂化的结构，有利于铁矿的磁化反应，磁性和相变。