ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559

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Chemical State Evolution of Iron Ore Sinter Investigated by Wide-Area Imaging XAFS
Yasuo Takeichi Yasuhiro NiwaReiko MuraoMasao Kimura
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JOURNAL OPEN ACCESS Advance online publication

Article ID: ISIJINT-2025-040

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Abstract

We have developed experimental and data analysis techniques of imaging XAFS (X-ray absorption fine structure) and investigated the Fe chemical state distribution in iron ore sinters over a field of view wider than 10 mm. Detailed spectral interpretation was provided for oxides and calcium ferrites at different stages of reduction. At lower temperatures, crack-driven propagation of reduction reaction was observed to penetrate deeper than 1 mm, while fine-grain primary hematite underwent reduction without forming cracks. Once the reduction of calcium ferrites begins, the reduction reaction changes to relatively uniform propagation, independent of mineral phases, resulting in a layered distribution of Fe chemical states.

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© 2025 The Iron and Steel Institute of Japan

This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs license
https://creativecommons.org/licenses/by-nc-nd/4.0/
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