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Formation Kinetics of Calcium Aluminates
Author(s) -
Singh Vipin K.,
Ali Mohammad M.,
Mandal Upendra K.
Publication year - 1990
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.1151-2916.1990.tb05128.x
Subject(s) - activation energy , arrhenius equation , calcium , kinetics , aluminate , chemistry , rate equation , monocalcium phosphate , atmospheric temperature range , mineralogy , materials science , thermodynamics , metallurgy , cement , physics , organic chemistry , quantum mechanics , fishery , fish <actinopterygii> , fish meal , biology
The kinetics of formation of calcium aluminates was studied by firing the reaction mixes in the temperature range 12000° to 1460°C for reaction times from 15 to 360 min. Phases formed were determined by taking X‐ray diffractograms of the samples. It was observed that all stable calcium aluminates were formed and that monocalcium aluminate (CA) grew with calcium dialuminate (CA 2 ) in a 1:2 reaction mix of CaO and Al 2 O 3 . CA reacted further with Al 2 O 3 to form CA 2 . The formation of CA 2 obeyed the rate law equation 1 ‐ (1 ‐ x ) 1/3 = Kt / r 2 . The activation energy for the system (140 kJ·mol −1 (33.4 kcal · mol −1 )) was determined by the Arrhenius equation.