Materials,
Journal Year:
2024,
Volume and Issue:
17(22), P. 5447 - 5447
Published: Nov. 7, 2024
In
this
work,
a
kinetic
study
and
modeling
of
the
decomposition
rock
sample
in
an
ascorbic
acid
medium
with
high
content
lepidolite
phase
were
carried
out,
results
which
are
great
importance
due
to
sample’s
lithium
(Li)
content.
The
was
characterized
by
X-ray
diffraction
(XRD),
inductively
coupled
plasma
atomic
emission
spectroscopy
(ICP-AES)
photoelectron
(XPS),
mineral
species
detected
lepidolite,
at
65.3%,
quartz,
30.6%,
muscovite,
4.1%,
quantitative
chemical
analysis
indicating
presence
elements
such
as
Li,
Si,
K,
Na,
O,
Al
and,
lesser
extent,
Fe
Ti;
highlights
that
Li
present
3.38%.
Lithium
element
kinetics
performed,
resulting
curves
comprising
induction
period,
progressive
conversion
stabilization;
highlighted
reaction
progressed
during
first
two
periods,
obtaining
order
(n)
0.4307
for
period
activation
energy
(Ea)
48.58
kJ
mol−1,
followed
n
=
0.309
Ea
25.161
mol−1.
This
suggested
mixed
control
regime
lower
temperature
ranges,
transition
from
transport
temperatures,
nature
concentration
effect
showing
predominates.
parameters
expressions
both
periods
obtained,
calculated
experimental
data
do
not
major
discrepancy.
According
to
the
chemical
composition
and
structure
properties
of
lepidolite
lithium
slag
(i.e.,
LS),
reinforcing
materials
were
prepared
improve
mechanical
flame
retardancy
poly(vinyl
alcohol)
(PVA)/montmorillonite
(MMT)
aerogels.
Specifically,
calcium
sulfate
anhydrous
whiskers
(CSAW)
synthesized
from
LS
rich
in
CaO
SO3
LS-B),
nanofillers
obtained
Al2O3
SiO2
LS-A).
A
densified
columnar-honeycomb
composite
aerogels
was
by
adding
above
CSAW
nano
LS-A.
The
results
show
that
improved
remarkably,
peaks
heat
release
rate,
smoke
production
total
decreased
significantly
with
combined
addition
strength
increased
about
160%,
modules
130%.
fire
safety
also
promoted
significantly,
i.e.,
peak
rate
128.37
kW·m–2,
cut
down
3.0
times.
enhancing
mechanism
effect
LS-A
on
should
be
due
formed
PVA/MMT
filling
proportion
utilized
achieved
more
than
40%.
aerogel
can
potentially
applied
retardant
fields.
This
study
is
great
significance
for
high
value
comprehensive
utilization
LS.
It
provides
an
idea
improving
future.
Materials,
Journal Year:
2024,
Volume and Issue:
17(22), P. 5447 - 5447
Published: Nov. 7, 2024
In
this
work,
a
kinetic
study
and
modeling
of
the
decomposition
rock
sample
in
an
ascorbic
acid
medium
with
high
content
lepidolite
phase
were
carried
out,
results
which
are
great
importance
due
to
sample’s
lithium
(Li)
content.
The
was
characterized
by
X-ray
diffraction
(XRD),
inductively
coupled
plasma
atomic
emission
spectroscopy
(ICP-AES)
photoelectron
(XPS),
mineral
species
detected
lepidolite,
at
65.3%,
quartz,
30.6%,
muscovite,
4.1%,
quantitative
chemical
analysis
indicating
presence
elements
such
as
Li,
Si,
K,
Na,
O,
Al
and,
lesser
extent,
Fe
Ti;
highlights
that
Li
present
3.38%.
Lithium
element
kinetics
performed,
resulting
curves
comprising
induction
period,
progressive
conversion
stabilization;
highlighted
reaction
progressed
during
first
two
periods,
obtaining
order
(n)
0.4307
for
period
activation
energy
(Ea)
48.58
kJ
mol−1,
followed
n
=
0.309
Ea
25.161
mol−1.
This
suggested
mixed
control
regime
lower
temperature
ranges,
transition
from
transport
temperatures,
nature
concentration
effect
showing
predominates.
parameters
expressions
both
periods
obtained,
calculated
experimental
data
do
not
major
discrepancy.
