Chen Yanxin, Yang Chao, Jiu Shaowu, Zhao Bo, Song Qiang
College of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Materials (Basel). 2022 May 17;15(10):3582. doi: 10.3390/ma15103582.
Steel is one of the most important industrial materials, which mainly comes from the smelting of iron ore. In view of the huge steel consumption every year, the exploitation of vast reserves of siderite ores is significant for improving the self-sufficiency rate of iron ore resources and ensuring the strategic security of the iron and steel industries. This paper investigated the influence of temperature, time, and other parameters on the magnetic properties of roasted siderite ores using the method of suspended roasting and analyzed the washability of roasted ores under weak-magnetic-field conditions using the magnetic separation tube experiment. The findings of the study explained the iron phase transformation process, i.e., FeCO was transformed into FeO by suspension magnetization roasting. Furthermore, the saturation magnetization of the roasted ore increased in due time at a constant temperature range of 550-750 °C and a roasting time of less than 5 s. It also increased with increasing temperature and constant time. The roasted ore achieved the best magnetic characteristics after roasting at 750 °C for 5 s. After low-intensity magnetic separation, the iron grade of the concentrate changed to 55.12%, with a recovery rate of 90.34%. The study results provide a reference for the development and application of siderite suspension magnetization roasting technology.
钢铁是最重要的工业材料之一，主要来源于铁矿石的冶炼。鉴于每年巨大的钢铁消费量，开发大量菱铁矿储量对于提高铁矿石资源的自给率和确保钢铁行业的战略安全具有重要意义。本文采用悬浮焙烧法研究了温度、时间等参数对焙烧菱铁矿矿石磁性的影响，并利用磁选管实验分析了弱磁场条件下焙烧矿石的可选性。研究结果解释了铁的相变过程，即通过悬浮磁化焙烧，FeCO转变为FeO。此外，在550-750℃的恒温范围内，焙烧时间小于5s时，焙烧矿石的饱和磁化强度适时增加。在恒定时间下，它也随温度升高而增加。焙烧矿石在750℃焙烧5s后获得了最佳的磁性特征。经过弱磁选后，精矿铁品位变为55.12%，回收率为90.34%。研究结果为菱铁矿悬浮磁化焙烧技术的开发与应用提供了参考。
