Hou Pengcheng, Gao Peng, Yuan Shuai, Zhang Zhenyue, Han Yuexin
College of Resources and Civil Engineering, Northeastern University, Shenyang 110819, P. R. China.
National-local Joint Engineering Research Center of High-efficient Exploitation Technology for Refractory Iron Ore Resources, Shenyang 110819, P. R. China.
ACS Omega. 2025 Feb 13;10(7):6965-6975. doi: 10.1021/acsomega.4c09725. eCollection 2025 Feb 25.
The Bayan Obo mine is a vast deposit containing multiple types of metals. This research proposed a method called suspension magnetization roasting-magnetic separation. The results indicated that iron concentrates with an iron grade of 65.10% and a recovery rate of 88.74% could be achieved by subjecting the mixture to a temperature of 425 °C for 30 min, a CO concentration of 20%, and a grinding fineness of -0.038 mm with a 95% yield. The rare earth element with a grade of 8.58% and a recovery rate of 92.29% can be extracted from the tailings following magnetic separation. This procedure entailed the transformation of hematite into magnetite, leading to a significant enhancement in the saturation magnetization intensity of the material that underwent treatment. This enhancement facilitated subsequent iron recovery. The roasted particles underwent a transformation, resulting in a roughened surface. Several fissures developed between rare earth elements and other minerals, favoring the process of grinding and separation.
白云鄂博矿是一个蕴藏多种金属的大型矿床。本研究提出了一种悬浮磁化焙烧 - 磁选方法。结果表明，将混合物在425℃下处理30分钟、CO浓度为20%、磨矿细度为-0.038毫米且产率为95%时，可获得铁品位为65.10%、回收率为88.74%的铁精矿。磁选后的尾矿中可提取出品位为8.58%、回收率为92.29%的稀土元素。该过程使赤铁矿转变为磁铁矿，导致经过处理的物料饱和磁化强度显著提高。这种提高促进了后续的铁回收。焙烧后的颗粒发生了转变，表面变得粗糙。稀土元素与其他矿物之间形成了几条裂缝，有利于研磨和分离过程。
