Influence of iron onto the structural reorganization process during the sintering of kaolins

Abstract : Reference kaolins KGa-1b, KGa-2 and KF are used as starting materials to examine the effect of chemically added iron on their structural transformations (near 950–980 °C) during sintering. The equivalent total Fe2O3 content is varied from 0.21 to 11.72 mass%. Iron addition leads to strong modification of the structural reorganization path of metakaolinite. Iron ions start to diffuse into metakaolinite network at 900 °C and lead to an early breakdown of the system. The corresponding exothermic peak is shifted from 970 °C to 900 °C. Regarding the heating rate, this peak appears to result from three overlapping reactions. The peak temperatures of these reactions are respectively 925 °C, 950 °C and 970 °C. A low heating rate enhances iron diffusion, promoting the structural reorganization process.
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Contributeur : Fabrice Rossignol <>
Soumis le : lundi 16 février 2015 - 10:23:25
Dernière modification le : lundi 22 janvier 2018 - 14:36:02

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Gisèle Laure Lecomte-Nana, Jean-Pierre Bonnet, Nibambin Soro. Influence of iron onto the structural reorganization process during the sintering of kaolins. Journal of the European Ceramic Society, Elsevier, 2013, 33 (4), pp.661-668. ⟨10.1016/j.jeurceramsoc.2012.10.024⟩. ⟨hal-01116973⟩

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