高FeO尖晶石型精矿氧化焙烧过程α-Fe2O3析出规律与再结晶行为研究

与普通磁铁精矿相比，高镁磁铁精矿、铬铁精矿、钛磁铁精矿等复杂尖晶石型精矿制备氧化球团时普遍存在难氧化、焙烧温度高、球团矿强度低等共性问题。α-Fe2O3再结晶是这些球团矿主要的固结形式，因此，围绕α-Fe2O3这一关键对象开展相关研究具有重要意义。当前已有研究主要侧重于尖晶石型精矿的氧化热力学行为、动力学机制和物相转变等方面，而对于α-Fe2O3生成、析出特性及再结晶行为等关键科学问题的研究仍不明确。基于此，本项目拟针对上述四种典型高FeO尖晶石型精矿，开展三个方面的研究：尖晶石型精矿的氧化行为及影响因素、氧化过程物相转变及α-Fe2O3析出规律、新生α-Fe2O3的再结晶行为与调控机制，阐明原料本身性质、α-Fe2O3生成析出特性和再结晶行为、球团固结之间的内在关系，为复杂尖晶石型精矿制备高质量氧化球团矿提供理论依据，本项目研究也将有助于进一步丰富和发展现有铁矿造块理论。

Compared with that made from ordinary magnetite concentrate, pellets made from complex spinel-type iron-bearing concentrates, such as high magnesium magnetite, chromite and titanomagnetite, etc., generally exhibited inferior oxidizability, requirement of higher roasting temperature and lower pellet strength. As with these oxidized pellets, the main consolidation form is recrystallization of α-Fe2O3. Therefore, it's of great significance to conduct relevant studies in terms of α-Fe2O3. Current existing studies are mainly confined to the oxidation thermodynamics behavior and kinetics mechanism of spinel-type concentrates as well as phase transformation, whereas the key scientific issues concerning the formation, precipitation characteristics and recrystallization behavior of α-Fe2O3 and its regulation are still not clear. On this basis, in terms of the above-mentioned four typical high FeO spinel-type concentrates, the present project focuses on the following three aspects: the oxidation behavior of spinel-type concentrates and influence factors, phase transformation and α-Fe2O3 precipitation rule during oxidation process, recrystallization behavior of newly formed α-Fe2O3. This project intends to illuminate the internal relationship of the inherent properties of raw materials, formation-precipitation characteristics and recrystallization behavior of α-Fe2O3, growth of connecting neck among particles and consolidation of the resultant pellets. The findings help provide a theoretical basis for the preparation of high quality oxidized pellets from complex spinel-type concentrates. In addition, the study of this project will also help promote the enrichment and development of the existing theory of iron ore agglomeration.