Polymers,
Год журнала:
2025,
Номер
17(7), С. 932 - 932
Опубликована: Март 29, 2025
Coal
gangue
and
flue
gas
desulfurization
gypsum
(DG)
are
industrial
by-products
whose
utilization
is
critical
for
sustainable
development.
This
study
explores
the
synergistic
activation
of
coal
using
DG
lime
to
develop
eco-friendly
cementitious
materials.
Three
systems-CF
(coal
gangue-DG),
CL
gangue-lime),
CFL
gangue-DG-lime)-were
designed
investigate
effects
on
reactivity.
Unconfined
compressive
strength
tests
identified
optimal
dosages
lime,
while
XRD,
SEM,
TGA-DTG,
NMR
analyses
were
employed
characterize
hydration
products
microstructure.
The
results
demonstrated
that
calcium
ions
from
both
facilitated
formation
C-(A)-S-H
gel,
enhancing
However,
excessive
led
undesirable
volume
expansion
due
ettringite
overproduction,
compromising
material
stability.
Excess
forms
weak
Ca(OH)2
binding
phases
causes
cracking
heat,
reducing
durability.
Thus,
dosage
in
CF
system
70%,
6%.
In
system,
70%
4%
achieve
best
performance.
combined
use
not
only
improved
reactivity
but
also
achieved
an
balance
between
enhancement
long-term
stability,
offering
a
promising
approach
construction
Minerals,
Год журнала:
2024,
Номер
14(8), С. 849 - 849
Опубликована: Авг. 22, 2024
Lithium,
a
critical
material
for
the
global
development
of
green
energy
sources,
is
anomalously
enriched
in
some
coal
deposits
and
by-products
to
levels
that
may
be
considered
economically
viable.
Recovering
lithium
from
coal,
particularly
gangue
or
ashes,
offers
promising
alternative
extracting
this
element.
This
process
could
potentially
lead
economic
gains
positive
environmental
impacts
by
more
efficiently
utilizing
coal-based
waste
materials.
review
focuses
on
concentrations
by-products,
modes
occurrence,
methods
used
identify
lithium-enriched
phases,
currently
available
hydrometallurgical
recovery
methods,
correlated
with
pretreatment
procedures
enable
release
inert
aluminosilicate
minerals.
Leaching
raw
appears
inefficient,
whereas
fly
ash
are
feasible
due
their
simpler
composition
higher
contents.
Lithium
extraction
can
achieve
rates
over
90%,
but
low
high
impurity
leachates
require
advanced
selective
separation
techniques.
Bottom
has
not
yet
been
evaluated
recovery,
despite
its
content
compared
feed
coal.
Molecules,
Год журнала:
2024,
Номер
29(24), С. 5919 - 5919
Опубликована: Дек. 15, 2024
Gallium,
a
critical
and
strategic
material
for
advanced
technologies,
is
anomalously
enriched
in
certain
coal
deposits
by-products.
Recovering
gallium
from
solid
residues
generated
during
production
utilization
can
yield
economic
benefits
positive
environmental
gains
through
more
efficient
waste
processing.
This
systematic
literature
review
focuses
on
concentrations
its
combustion
or
gasification
by-products,
modes
of
occurrence,
gallium-hosting
phases,
hydrometallurgical
recovery
methods,
including
pretreatment
procedures
that
facilitate
metal
release
inert
aluminosilicate
minerals.
Coal
gangue,
especially
fly
ashes
gasification,
are
particularly
promising
due
to
their
higher
content
rates,
which
exceed
90%
under
optimal
conditions.
However,
the
low
high
levels
impurities
leachates
require
innovative
selective
separation
techniques,
primarily
involving
ion
exchange
adsorption.
The
scientific
revealed
coal,
bottom
ash,
coarse
slag
have
not
yet
been
evaluated
recovery,
even
though
wastes
contain
than
original
material.
