International Journal of Applied Ceramic Technology,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 4, 2025
Abstract
The
thermal
decomposition
(TD)
of
magnesite
is
crucial
for
its
high‐value
applications,
and
understanding
reaction
mechanisms
requires
establishing
accurate
kinetic
models.
This
research
investigates
the
TD
kinetics
microcrystalline
under
varying
heating
rates
(HRs)
using
thermogravimetry
differential
scanning
calorimetry
(TG–DSC)
analysis.
Kinetic
parameters
were
derived
Coats–Redfern
(CR),
Kissinger–Akahira–Sunose
(KAS),
Flynn–Wall–Ozawa
(FWO)
methods.
influence
HRs
on
process
resulting
MgO
morphology
was
analyzed.
results
demonstrated
that
as
increased,
rate
curves
shifted
to
higher
temperatures,
necessitating
elevated
temperatures
similar
levels
decomposition.
mean
activation
energy
()
calculated
be
162.45
kJ/mol,
with
a
strong
linear
correlation
between
pre‐exponential
factor,
suggesting
robust
compensation.
followed
two‐dimensional
phase
boundary
mechanism
cylindrical
symmetry.
“Original
shape
pseudomorphs”
found
significantly
affect
microstructure,
particle
size
variation,
behavior
products.
These
findings
provide
important
insights
industrial
processing
magnesite.
Materials,
Journal Year:
2024,
Volume and Issue:
17(16), P. 3968 - 3968
Published: Aug. 9, 2024
Refractory
materials
are
an
important
pillar
for
the
stable
development
of
high-temperature
industry.
A
large
amount
waste
refractories
needs
to
be
further
disposed
every
year,
so
it
is
great
significance
carry
out
research
on
recycling
used
refractories.
In
this
work,
lightweight
composite
aggregate
was
prepared
by
using
discarded
Al2O3-ZrO2-C
as
main
raw
material,
and
performance
improved
adjusting
calcination
temperature
introducing
light
calcined
magnesia
additives.
The
results
showed
that
cold
compressive
strength
thermal
shock
resistance
aggregates
were
significantly
with
increasing
temperature.
Moreover,
introduction
can
effectively
improve
apparent
porosity,
strength,
at
1400
°C.
Consequently,
work
provides
a
useful
reference
resource
utilization
refractories,
while
expected
applied
in
field
insulation.
