Abstract
Ca2Fe2−xAlxO5 solid solution is an intermediate product for reduction of complex calcium ferrites, which is a restrictive step for efficient metallurgy of high-aluminum iron ore for ironmaking. In this work, three Ca2Fe2−xAlxO5 (x = 0.00, 0.21, 0.41) solid solutions were synthesized to investigate the reduction mechanism of Ca2Fe2−xAlxO5 solid solution. Combined with the Rietveld refinement method, it was confirmed Ca2Fe2−xAlxO5 is a substitutional solid solution, where the Al3+ could replace the position of Fe3+ to lower the cell size with orthorhombic crystal. The reduction result of Ca2Fe2−xAlxO5 shows that the solid solution of Al3+ in Ca2Fe2−xAlxO5 increased the structure stability, in which the reduction-beginning temperature increased from 820 °C to 1020 °C when x increased to 0.41, which was also verified by first principle calculation. It was found the reduction products of Ca2Fe2−xAlxO5 were iron, CaO, and Ca3Al2O6, where the CaO belongs to a solid solution with the lower melting-temperature, resulting in decrease of the reduction rate at the higher temperature. Furthermore, it was revealed that the Al3+ has been gradually dissolved into Ca2Fe2−xAlxO5 remained with the reduction in progress at the earlier stage, but the Al3+ separates from Ca2Fe2−xAlxO5 and reacts with CaO to generate Ca3Al2O6 at the later stage of reduction due to the Al3+ amount exceeding the solid solution limit (x = 0.63 at 1050 °C).
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The authors are grateful to the National Natural Science Foundation of China (U22A20175 and No. 52304317) for financial support of this research.
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Du, Y., Guo, XM. Displacement and Migration Behavior of Al3+ in Ca2Fe2−xAlxO5 Solid Solution During Reduction Process. Metall Mater Trans B (2024). https://doi.org/10.1007/s11663-024-03120-3
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DOI: https://doi.org/10.1007/s11663-024-03120-3