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Effect of dehydroxylation on the specific heat of simple clay mixtures

Abstract : Specific heats of four clays (standard reference kaolins, commercial kaolin and montmorillonite) before and after dehydroxylation have been measured. The results were compared with handbook data for the thermal chemical properties of solids. Good agreement has been obtained for the reference kaolin before any thermal treatment. Then, following thermal treatments at 500 °C, 600 °C and 700 °C, dehydroxylation leads to a progressive decrease of heat capacity per unit mass. After dehydroxylation, heat capacity values for all the studied materials are rather similar and agree closely with those estimated by the rule of mixtures. Finally, an empirical relation describing the specific heat capacity (C) in J kg−1 K−1 of dehydroxylated kaolin from 40 °C to 1100 °C is proposed: C = 1128 + 0.102T − 36 × 106T−2 where T is in K.
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https://hal-unilim.archives-ouvertes.fr/hal-00632193
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Soumis le : jeudi 13 octobre 2011 - 16:42:42
Dernière modification le : vendredi 28 février 2020 - 13:26:14

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Aurélie Michot, David Stanley Smith, Solange Degot, Gisèle Laure Lecomte-Nana. Effect of dehydroxylation on the specific heat of simple clay mixtures. Journal of the European Ceramic Society, Elsevier, 2011, 31 (8), pp.1377-1382. ⟨10.1016/j.jeurceramsoc.2011.01.007⟩. ⟨hal-00632193⟩

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