Abstract
Zinc oxide powders carbonated at 8 and 13°C in an atmosphere of carbon dioxide (1 atm) and saturated water vapor were investigated by X-ray diffraction analysis and TG/DTA. Similar results were obtained for carbonation at both temperatures. Multiple phases coexisted. The predominant phase changed approximately from the oxide to the normal carbonate via a basic carbonate, as reported by Ohkuma et al. (Nihon Kagaku Kaishi, (1987) 802). Endothermic weight loss was observed at ∼ 90, 220–2250 and 340°C. A tentative formula was proposed for the basic carbonate; Zn 3CO 3(OH) 4·2H 2O. Decomposition reactions were proposed for the first and second endothermic weight losses, Zn 3CO 3(OH) 4·2H 2O→Zn 3CO 3(OH) 4+2H 2O↑ and Zn 3CO 3(OH) 4→3ZnO+CO 2↑+2H 2O↑ , respectively. The third endothermic weight loss was attributed to the decomposition of the normal carbonate.
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