ABSTRACT

Siderite ore (FeCO₃) is an important iron ore resource that is widely distributed around the world. However, it is difficult to process using conventional methods owing to the low iron grade, easy sliming, and high impurity content. Based on the mechanism of thermal decomposition, the combination of metallurgy and processing is a promising method to process siderite ore. In this study, experiments on thermal decomposition were performed using a fluidization reactor in flowing atmospheres of N₂, CO, and CO₂. The phase transformation and magnetism were characterized via X-ray diffraction, Mössbauer spectroscopy, and vibrating sample magnetometry. The results indicated that the thermal decomposition of siderite ore exhibited significant differences in various atmospheres, particularly for the phase transformation and magnetism, which primarily depended on a two-step function: FeCO₃ → FeO + CO₂ → Fe₃O₄ + CO. It has implications for the utilization of siderite ore resources.

摘要

菱铁矿(FeCO ₃ )是一种重要的铁矿资源，广泛分布于世界各地。但铁品位低，易泥化，杂质含量高，难以用常规方法加工。基于热分解机理，冶金与加工相结合是一种很有前途的菱铁矿加工方法。在这项研究中，使用流化反应器在 N ₂、CO 和 CO _{2的流动气氛中进行了热分解实验}. 通过 X 射线衍射、穆斯堡尔光谱和振动样品磁力测定法表征相变和磁性。结果表明菱铁矿的热分解在各种气氛下表现出显着差异，特别是相变和磁性，这主要取决于两步函数：FeCO 3 → FeO + CO 2 _→ Fe ₃ O ₄ + _CO。对菱铁矿矿资源的利用具有重要意义。