Department of Materials Science and Engineering, State Key Lab of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China.
J Hazard Mater. 2010 Feb 15;174(1-3):71-7. doi: 10.1016/j.jhazmat.2009.09.018. Epub 2009 Sep 11.
Iron ore tailings have become one kind of the most hazardous solid waste. In order to recycle iron in the tailings, we present a technique using magnetizing roasting process followed by magnetic separation. After analysis of chemical composition and crystalline phase, according to experimental mechanism, the effects of different parameters on recovery efficiency of iron were carried out. The optimum reaction parameters were proposed as the following: ratio of coal: iron ore tailings as 1:100, roasting at 800 degrees C for 30 min, and milling 15 min of roasted samples. With these optimum parameters, the grade of magnetic concentrate was 61.3% Fe and recovery rate of 88.2%. With this method, a great amount of iron can be reused. In addition, the microstructure and phase transformation of the process of magnetizing roasting were studied.
铁矿尾矿已成为最危险的固体废物之一。为了回收尾矿中的铁，我们提出了一种使用磁化焙烧工艺随后进行磁选的技术。在分析化学成分和晶体相之后，根据实验机理，研究了不同参数对铁回收率的影响。提出的最佳反应参数如下：煤与铁矿尾矿的比例为 1:100，在 800°C 下焙烧 30 分钟，并将焙烧样品研磨 15 分钟。在这些最佳参数下，磁性精矿的品位为 61.3%Fe，回收率为 88.2%。通过这种方法，可以大量重复使用铁。此外，还研究了磁化焙烧过程的微观结构和相变。
