Thermal decomposition of limestone in a large scale thermogravimetric analyzer

The decomposition of calcium carbonate spheres has been investigated using limestone particles of sizes 7, 5 and 2 mm in a large scale thermogravimetric analyzer under near isothermal conditions. Experiments were conducted in atmospheres of pure N 2, and 7%, 14% and 21% CO 2-N mixtures. Data are int...

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Bibliographic Details
Published in:Thermochimica acta 1993-01, Vol.213, p.223-240
Main Authors: Lee, Jia-Twu, Keener, Timothy C., Knoderer, Mark, Khang, Soon-Jai
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
Inorganic chemistry and origins of life
Kinetics and mechanism of reactions
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Summary:The decomposition of calcium carbonate spheres has been investigated using limestone particles of sizes 7, 5 and 2 mm in a large scale thermogravimetric analyzer under near isothermal conditions. Experiments were conducted in atmospheres of pure N 2, and 7%, 14% and 21% CO 2-N mixtures. Data are interpreted in terms of apparent activation energy E and frequency factor A assuming a first-order reaction and Arrhenius temperature dependence of the rate constant. Microscopic analysis has shown that the decomposition reaction takes place at the boundary between the undecomposed carbonate and the layer of porous lime formed outside. This boundary moves towards the center of the particle but remains spherical in shape.
ISSN:0040-6031
1872-762X
DOI:10.1016/0040-6031(93)80018-6