根据弱磁性白云鄂博稀土尾矿在N2环境下升温-降温过程中磁化率的变化,确定尾矿经磁化焙烧、弱磁选回收铁的可行性.对样品进行原位XRD分析进一步证实了在升温过程温度升至580℃时Fe3 O4开始出现.通过大量实验,在N2气氛、无任何添加还原剂的情况下直接磁化焙烧,之后用弱磁选回收铁,发现在焙烧温度800℃,磁选粒度在-45～+74 μm之间时,精矿中的TFe由尾矿的17％提高到61.5％,实现了76.8％回收率的良好指标.
The magnetic susceptibility measurement on weak magnetic minerals of Bayan Obo tailing under N2 atmosphere in a heating-cooling process indicated that the minerals could be magnetized by roasting in this condition.In situ XRD at high temperature confirmed the occurrence of Fe304 at 560 ℃ during cooling.The roasting experiments under N2 atmosphere was done without any reductant added,TFe content in the magnetic concentrate was increased from 17％ to 61.5％ in the tailing and good recovery rate was achieved 76.8％ when roast temperature was 800 ℃ and the mineral size for magnetic separation was between-45 ～+ 74 μm.
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