Abstract Induration of ilmenite pellets by oxidation is an essential step in the pelletization process since it decides the physical and metallurgical properties of the pellets. In this regard, the induration parameters like temperature and roasting time have been optimized to obtain good quality ilmenite pellets made of concentrates obtained from low-grade ilmenite ores of Odisha, India. The oxidation temperature of 900 °C at a short roasting time of 15 min has been found suitable to achieve recommended requirements of various pellet properties like cold compressive strength, porosity, metallization, tumble, and abrasion indices. X-ray diffraction and microstructural analysis indicate that the recrystallization of hematite in the oxidation process improves the mechanical strength of the pellets. In contrast, the formation of ferric pseudobrookite phase at 1000 °C and 1100 °C oxidation temperatures impairs the pellet strength.

中文翻译：

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低品位钛铁矿球团的硬化方面：氧化参数的优化和直接还原应用的表征

摘要 钛铁矿球团的氧化硬化是球团工艺中必不可少的步骤，因为它决定了球团矿的物理和冶金性能。在这方面，对温度和焙烧时间等硬化参数进行了优化，以获得由印度奥里萨邦低品位钛铁矿精矿制成的优质钛铁矿球团。已发现 900 °C 的氧化温度和 15 分钟的短焙烧时间适合实现各种球团特性的推荐要求，如冷压缩强度、孔隙率、金属化、翻滚和磨损指数。X射线衍射和微观结构分析表明，氧化过程中赤铁矿的再结晶提高了球团的机械强度。相比之下，