Abstract
Ironsand is a type of titanic-ferrous solution ore. As most ironsands come from rapidly cooled lava, raw ironsand particles consist of complicated distributions of elements and a variety of Ti–Fe solid solution phases. In this study, samples of raw and pre-oxidized ironsands were reduced by hydrogen at 900°C for different time intervals. The formation of multiple microstructures of ironsand during the reduction process were investigated. For raw ironsand, a three-layer core structure, an incompletely reduced core structure, and a lump/net structure appeared in order with the reduction procedure. However, for pre-oxidized ironsand, the unit cells of major phases of ironsand shrink, leading to the formation of microcracks during the oxidation pretreatment. These cracks in turn trigger unordered reduction structures, significantly accelerating the reaction kinetics.
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Acknowledgements
This work was financially supported by the National Nature Science Foundation of China (51604209). Zhenyang Wang also gratefully acknowledges the assistance from the members of the Sustainable Materials Processing (SMP) research group at the University of Toronto and the Laboratory of Advanced Ironmaking at the University of Science and Technology Beijing during the joint research program funded by China Scholarship Council (CSC).
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Wang, Z., Zhang, J., Liu, Z. et al. Formation of Multiple Microstructures During the Reduction of Ironsand. JOM 71, 1776–1784 (2019). https://doi.org/10.1007/s11837-018-3279-0
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DOI: https://doi.org/10.1007/s11837-018-3279-0