Calcium Carbonate Decomposition in Carbon Dioxide Atmosphere

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Abstract

<jats:p>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<jats:sub>2</jats:sub> 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<jats:sub>2</jats:sub> leaves the CaCO<jats:sub>3</jats:sub> cell and the residue of the CaO apparently assumes a metastable rhombohedral configuration similar to the original CaCO<jats:sub>3</jats:sub>. 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.</jats:p>

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