Recovery of iron from vanadium tailings with coal-based direct reduction followed by magnetic separation.
Recovery of iron from vanadium tailings with coal-based direct reduction followed by magnetic separation.
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DOI：
10.1016/j.jhazmat.2010.10.062
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发表时间：
2011-01
影响因子：
13.6
通讯作者：
Huifen Yang;Lili Jing;Baogang Zhang
中科院分区：
文献类型：
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作者：
Huifen Yang;Lili Jing;Baogang Zhang
提出了一种煤基直接还原-磁选回收利用钒尾矿中废铁的工艺。实验确定了添加剂用量、尾矿/还原剂/添加剂比例、还原温度和时间以及粒度等工艺参数。最佳工艺参数为：以石灰为添加剂，褐煤为还原剂，钒尾矿：褐煤：石灰= 100：30：10，在1200°C下还原焙烧60 min，焙烧后98%的产品粒度小于30μm。在此条件下，获得了全铁90.31%、金属化铁89.76%、全铁回收率83.88%的磁精矿。此外，采用X射线粉末衍射技术（XRD）对钒尾矿、煤基还原产物和磁精矿进行了物相分析。利用扫描电子显微镜（SEM）分析了上述产物的微观结构，以帮助理解其机理。
A technique with coal-based direct reduction followed by magnetic separation is presented in this study for recovering and reusing iron otherwise wasted in vanadium tailings. Process parameters such as usage of additives, tailings/reductant/additives ratio, reduction temperature and time, as well as particle size were experimentally determined. The optimum process parameters were proposed as follows: using lime as the additive, lignite as the reductant, weight ratios of vanadium tailings/lignite/lime at 100:30:10, reduction roasting at 1200°C for 60min, and particle size of 98% less than 30μm in the final roasted product feeding to magnetic separation. Under these conditions, a magnetic concentrate containing 90.31% total iron and 89.76% metallization iron with a total iron recovery rate of 83.88% was obtained. In addition, mineralography of vanadium tailings, coal-based reduction product and magnetic concentrate were studied by X-ray powder diffraction technique (XRD). The microstructures of above products were analyzed by scanning electron microscope (SEM) to help understand the mechanism.