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1 LEM - Laboratoire Environnement et Minéralurgie 2 LCSM - Laboratoire de chimie du solide minéral

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

Autor: Ndue Kanari - Devabrata Mishra - I. Gaballah - Bernard Dupré -



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