Kinetics and mechanism of formation of monocalcium aluminate, CaAl2O4
Abstract
The kinetics of the reaction for the formation of monocalcium aluminate
(CaAl
2
O
4
) using 1:1 molar mixtures of A.R. grade
calcium carbonate and A.R. α-Al
2
O
3
or gibbsite
have been investigated in the range 1150–1400 °C using
quantitative X-ray diffraction analysis. The phases
Ca
3
Al
2
O
6
and
Ca
12
Al
14
O
33
were found to be
intermediates in the formation of CaAl
2
O
4
, whereas
CaAl
4
O
7
was formed via an initial side
reaction. The formation of CaAl
2
O
4
from the oxides
was found to fit well with the diffusion controlled model of Ginstling and
Brounshtein. The activation energy for the formation of
CaAl
2
O
4
from the amount of
CaAl
2
O
4
formed from the reaction of calcite with
α-Al
2
O
3
was determined to be 205±10 kJ
mol
-1
.
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