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Effect of LiCl on the Rate of Calcite Decomposition
Author(s) -
KNUTSEN GARY F.,
SEARCY ALAN W.,
BERUTO DARIO
Publication year - 1982
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.1151-2916.1982.tb10409.x
Subject(s) - calcite , decomposition , chemistry , recrystallization (geology) , langmuir , eutectic system , knudsen number , analytical chemistry (journal) , mineralogy , inorganic chemistry , chemical engineering , thermodynamics , geology , adsorption , chromatography , alloy , organic chemistry , engineering , paleontology , physics
The rate of decomposition of calcite powder in vacuum was measured by the Langmuir and Knudsen methods. Measured pressures in effusion cells in the absence of additives approach the equilibrium value. The Langmuir experiments gave an apparent equilibrium CO 2 pressure of =3×10 −4 times the known pressure for the reaction. It is suggested that the CO 2 is in equilibrium with the calcite but the CaO is not. In Langmuir experiments, 10 wt% LiCl does not increase the initial decomposition rate. In the Knudsen cells, 10 wt% LiCl can increase the initial rate by >2 times. LiCl reduces the surface area of the product CaO under either condition from ≥30 to ∼1 m 2 /g. Probably an LiCl‐CaO eutectic provides a solution path for CaO recrystallization and, at high CO 2 pressures, also for CaCO 3 decomposition.