塩基性炭酸カルシウムの熱分解機構

概要

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Pyrolysis of basic calcium carbonate (BCC) in inert gas flow was studied. Three endothermic peaks in the DTA curve and three weight losses corresponding to the DTA peaks in the TG curve were observed. The evolved gas was analyzed and the thermal decomposition process was investigated by high temperature X-ray diffractometry. The first endothermic process was found to correspond to the formation of BCC anhydride by dehydration of BCC crystals. The second one corresponded to the formation of calcite and Ca(OH)_2 by decomposition of BCC anhydride, and dehydration of the resulting Ca(OH)_2 into CaO. The third one was related to decarbonation of the calcite into CaO. Infrared absorption spectra of intermediate products support these results. Electron microscopic studies showed that, after the decomposition of plate-like BCC anhydride, calcite particles were produced inside the plate-like condensates. After decarbonation, single crystals of CaO were formed by disintegration of the condensates.
社団法人日本セラミックス協会の論文
1993-08-01