Low temperature reactivity in agglomerates containing iron oxide |
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Authors: | Ryan Robinson Fabrice Patisson Bo Björkman |
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Institution: | 1.Lule? University of Technology,Lule?,Sweden;2.LSG2M, Nancy-Université,Nancy Cedex,France |
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Abstract: | In this study, we have attempted to explain the complex reactions that occur during the dehydration of Ca(OH)2, in the presence of solid carbon and Fe2O3, in order to clarify their role as eventual precursors to the reduction and high temperature strength characteristics in
feedstock agglomerates of iron and steelmaking by-products. A series of simultaneous thermo-gravimetric (TG), differential
thermal analytic (DTA), and mass spectrometric (MS) tests were performed on agglomerated sample mixes of Ca(OH)2, C, and Fe2O3 to test the influence of heating rate and particle size on the transformations occurring below 1,073 K in inert atmosphere.
The overall transformation begins with calcium hydroxide dehydration. Nucleation and growth of CaO grains during dehydration,
as well as subsequent gasification of solid carbon, are highly dependent on the governing interstitial particle porosity and
mildly dependent on the heating rate in and around agglomerates. The reduction of hematite in current agglomerates is, by
association to preceding reactions, partly dependent on porosity and heating rate, but the mechanism of reduction was also
found to be highly dependent on the particle size of iron oxides. Furthermore, in areas of intimate contact between CaO and
iron oxide, a calcium ferrite phase appears in the form of angular and calcium-rich particles. |
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