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Calcium Carbonate Decomposition in Carbon Dioxide Atmosphere
Author(s) -
HYATT EDMOND P.,
CUTLER IVAN B.,
WADSWORTH MILTON E.
Publication year - 1958
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1958.tb13521.x
Subject(s) - carbon dioxide , calcium carbonate , calcite , decomposition , chemistry , mineralogy , controlled atmosphere , nitrogen , vaterite , partial pressure , metastability , carbonate , inorganic chemistry , chemical engineering , materials science , aragonite , organic chemistry , oxygen , engineering
Calcite crystal fragments of known surface area were decomposed in controlled carbon dioxide atmospheres. The decomposing sample was weighed continuously on an automatically recording thermobalance and a rate of weight loss per unit area was obtained. A rate expression involving actual and equilibrium CO 2 pressures and the decomposition rate in pure nitrogen was derived. The mechanism of the decomposition is pictured as being a two‐stage phenomenon. Initially the CO 2 leaves the CaCO 3 cell and the residue of the CaO apparently assumes a metastable rhombohedral configuration similar to the original CaCO 3 . The second step of the reaction is the formation of well‐crystallized CaO from the active CaO. The active CaO thus acts as a bridge for this reversible reaction.