Thermal Decomposition of Hydrocalumite over a Temperature Range of 400–1500°C and Its Structure Reconstruction in WaterReport as inadecuate




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Journal of ChemistryVolume 2014 2014, Article ID 454098, 8 pages

Research ArticleState Key Laboratory of Biogeology and Environmental Geology and School of Environmental Studies, China University of Geosciences, 388 Lumo Road, Wuhan, Hubei 430074, China

Received 25 May 2014; Accepted 8 July 2014; Published 17 July 2014

Academic Editor: M. Fernanda Carvalho

Copyright © 2014 Jiao Tian and Qinghai Guo. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The thermal decomposition process and structure memory effect of hydrocalumite were investigated systematically for the first time over a wide temperature range of 400–1500°C. The calcined hydrocalumite samples and their rehydrated products were characterized by XRD, FT-IR, and SEM-EDX. The results show that the calcination products at temperatures ranging from 500 to 900°C are basically mayenite and lime, while one of the final products obtained by calcination at and above 1000°C is probably tricalcium aluminate Ca3Al2O6. For the hydrocalumite samples calcined at temperatures below 1000°C, their lamellar structure can be completely recovered in deionized water at room temperature. However, the further increase of calcination temperature could impair the regeneration ability of hydrocalumite via contact with water. Upon calcination of hydrocalumite at 1000–1500°C followed by reaction with water, a stable compound tricalcium aluminate hexahydrate Ca3Al2O6·6H2O was produced, which is the reason why less hydrocalumite could be regenerated.





Author: Jiao Tian and Qinghai Guo

Source: https://www.hindawi.com/



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