期刊
ISIJ INTERNATIONAL
卷 62, 期 6, 页码 1159-1167出版社
IRON STEEL INST JAPAN KEIDANREN KAIKAN
DOI: 10.2355/isijinternational.ISIJINT-2021-559
关键词
iron ore sinter; calcium-ferrite; in situ; X-ray diffraction; X-ray absorption spectroscopy
The reduction behavior of various multi-component calcium ferrites at 900 degrees Celsius was studied, revealing that calcium ferrites with higher aluminum content showed lower reducibility compared to those with lower aluminum content.
Reduction behavior of various multi-component calcium ferrites at 900 degrees C were investigated by using in situ X-ray diffraction (XRD) and X-ray absorption spectroscopy. Reaction products (intermediate components) were determined by XRD and change in X-ray absorption spectra of Fe and Ca K-edges were analyzed to determine reaction rate constants. SFCA-I (Ca-3(Ca,Fe)(Fe,Al)(16)O-28) and SFCA (Ca-2(Fe,Ca)(6)(Fe,Al,Si)(6)O-20) consist of layered structure of spinel and pyroxene. Early stage of reduction reaction, diffraction peaks of spinel structure were observed which indicating SFCA-I and SFCA decomposed into these units at the first step of the reduction reactions. The spinel was reduced sequentially into FeOx then Fe. Intermediate component, Ca-2(Fe,Al)(2)O-5 originated in pyroxene module was hard to reduce and reaction was controlled by decomposition of this phase. Reduction of SFCA-I started later than SFCA (with 5.7 mol% Al2O3) under hydrogen gas reduction condition at 900 degrees C. SFCA with a high aluminum content indicated lower reducibility than that with a low one.
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