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Thermal decomposition of zinc carbonate hydroxide |
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| Authors: | N. Kanari, D. Mishra, I. Gaballah, B. Dupr ,Mineral Processing,Environmental Engineering Team |
| Affiliation: | a Laboratoire Environnement et Minéralurgie, Institut National Polytechnique de Lorraine, rue du Doyen M. Roubault, BP 40, 54501, Vandœuvre Cedex, France b Centre National de la Recherche Scientifique, 3 rue Michel-Ange, 75794, Paris Cedex, France c École Nationale Supérieure de Géologie, rue du Doyen M. Roubault, BP 40, 54501, Vandœuvre Cedex, France d Institut National Polytechnique de Lorraine, 2 rue de la Forêt de Haye, 54501, Vandœuvre Cedex, France e Laboratoire de Chimie du Solide Minérale, Associated to CNRS UMR 7555, Université Henri Poincaré, Bvd des Aiguillettes, BP 239, 54506, Vandœuvre, France |
| Abstract: | This study is devoted to the thermal decomposition of two zinc carbonate hydroxide samples up to 400 °C. Thermogravimetric analysis (TGA), boat experiments and differential scanning calorimetry (DSC) measurements were used to follow the decomposition reactions. The initial samples and the solid decomposition products were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) and laser particle size analyzer. Results showed that zinc carbonate hydroxide decomposition started at about 150 °C and the rate of decomposition became significant at temperatures higher than 200 °C. The apparent activation energies (Ea) in the temperature range 150–240 °C for these two samples were 132 and 153 kJ/mol. The XRD analyses of the intermediately decomposed samples and the DSC results up to 400 °C suggested a single-step decomposition of zinc carbonate hydroxide to zinc oxide with not much change in their overall morphologies. |
| Keywords: | Zinc carbonate hydroxide Thermal decomposition Zinc oxide |
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