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以含铁14.51%(质量分数)的铁尾矿为研究对象,采用煤基深度还原—磁选方法回收铁,研究并分析了焙烧过程中不同煤还原剂、助熔剂、焙烧温度以及焙烧时间对铁还原的影响规律。结果表明:对于铁尾矿深度还原,固定碳含量高且含有少量挥发份的煤效果较好;以无烟煤为还原剂,CaO为助熔剂,1300℃焙烧180 min,磁选得到铁产品中铁品位90.12%,铁回收率为72.21%。通过X射线衍射(XRD)、扫描电镜(SEM)及能谱分析(EDS)分析了磁选铁产品中铁的存在形式,结果表明:铁尾矿深度还原过程中铁矿物大部分被还原成金属铁,仅有少部分矿物是金属铁被氧化的磁铁矿和石英,实现了铁尾矿中铁的还原和富集。
The iron tailings with a content of 14.51% (mass fraction) iron were used as the research object. Iron was recovered by the coal-based depth reduction-magnetic separation method. Different coal reducing agents, fluxes, calcination temperature and calcination time The impact of iron reduction rules. The results show that for deep reduction of iron tailings, coal with high fixed carbon content and a small amount of volatiles is better. With anthracite as reducing agent and CaO as flux, calcining at 1300 ℃ for 180 min, the iron grade of iron product is 90.12 %, Iron recovery rate of 72.21%. The existence of iron in the magnetic separation iron was analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results showed that most of the iron minerals were reduced to metallic iron during the deep reduction of iron tailings, Only a small percentage of the minerals are magnetite and quartz oxidized by metallic iron, enabling the reduction and enrichment of iron in the iron tailings.