Abstract
High-purity hematite was divided into five size fractions, and the reduction behavior of these fractions was investigated to explore the problem of the asynchronous reaction of heterogeneous and complex refractory iron ore. The quantitative relationship between the conversion rate, roasting time, and ore particle size of different temperature systems was determined using the MATLAB software. X-ray diffraction (XRD) and vibrating sample magnetometry (VSM) were conducted on roasted samples, and reducing the ore size was found to promote the transformation of the hematite phase into magnetite during the magnetization roasting process. Scanning electron microscopy (SEM) and specific surface area analysis demonstrated that the new magnetite had a loose porous structure, which provides a channel for CO gas to contact with the new hematite surface. The increase in the ore particle size increased the CO diffusion resistance, resulting in an asynchronous reaction.
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