This paper presents a comprehensive study on the production and reduction of high-quality iron ore pellets characterized by a basicity index nearing 0.5 and diameters ranging from 1 to 2 cm. The reduction process was carried out in a hydrogen atmosphere at temperatures spanning 800–1000 °C and a pressure of 8 bar. Initial findings revealed substantial variations in pellet density and compressive strength, attributed to their mean dimensions. To delve into the microstructural transformations occurring during reduction, meticulous microtomographic analyses were conducted on each pellet before and after the reduction process. The research assessed reducibility factors such as porosity, pore size, and tortuosity adjustments across diverse reduction conditions. The study highlights the intimate connection between the reduction process rate, processing parameters, and pellet microstructure. Furthermore, the metallization tendencies were explored through extensive reduction experiments involving multiple pellets. These findings offer crucial insights into optimizing iron ore pellet performance during production and reduction processes, contributing to advancements in industrial applications.

中文翻译：

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铁矿石球团孔隙度的三维表征：综合研究


本文对优质铁矿球团矿的生产和还原进行了全面的研究，其特征是碱度指数接近 0.5，直径范围为 1 至 2 厘米。还原过程在氢气气氛中进行，温度范围为 800-1000°C，压力为 8 bar。初步研究结果显示，颗粒密度和抗压强度存在显着差异，这归因于它们的平均尺寸。为了深入研究还原过程中发生的微观结构转变，在还原过程之前和之后对每个颗粒进行了细致的显微断层扫描分析。该研究评估了不同还原条件下的还原性因素，例如孔隙率、孔径和弯曲度调整。该研究强调了还原工艺速率、工艺参数和颗粒微观结构之间的密切联系。此外，通过涉及多个球团的广泛还原实验探索了金属化趋势。这些发现为优化生产和还原过程中铁矿石球团性能提供了重要见解，有助于工业应用的进步。