Scientific Reports,
Journal Year:
2024,
Volume and Issue:
14(1)
Published: Jan. 3, 2024
In
order
to
promote
the
sustainable
use
of
resources
and
reduce
waste
glass
tailings
resources.
The
present
study
focuses
on
a
fluorite
mine
as
research
subject,
utilizing
coarse
tailings,
fine
cement
substitute-curing
agent,
recycled
primary
raw
materials.
It
investigates
changes
in
compressive
strength
tailing
with
varying
sand-
binder
ratios
content
at
3-day,
7-day,
28-day
intervals
when
filling
slurry
concentration
is
set
77%
ratio
maintained
2:1.
findings
indicate
that
there
minimal
impact
test
blocks
using
sand
4:1
below
10%.
However,
once
exceeds
10%,
significant
decline
occurs.
Scanning
electron
microscope
(SEM)
images
reveal
ettringite
crystal
formation
both
0%
25%
due
high
levels
Na
Powder Technology,
Journal Year:
2024,
Volume and Issue:
440, P. 119741 - 119741
Published: April 4, 2024
Cement
paste
backfill
(CPB)
can
provide
social
and
economic
benefits
such
as
treating
mine
waste,
preventing
surface
settlement,
providing
a
safe
working
platform
in
underground
mines
improving
ore
recovery.
Rheological
properties
(including
yield
stress
viscosity)
are
key
factors
influencing
the
ability
of
CPB
to
be
successfully
transported
into
specified
stopes.
However,
no
study
has
been
carried
out
comprehensively
examine
rheological
under
combined
effects
sulfate,
temperature
time.
This
was
therefore
evaluate
viscosity
samples
with
different
sulfate
contents
(0
ppm,
5000
15,000
ppm
25,000
ppm),
exposed
temperatures
(2
°C,
20
°C
35
°C)
subjected
curing
or
transport
times
(0,
min.,
1
h
2
h).
Additional
measurements,
TG/DTG,
pH,
zeta
potential
EC
monitoring,
were
also
out.
It
found
that
increased
significantly
simultaneous
increase
time
temperature,
increased,
but
at
relatively
limited
rate.
There
competition
between
stress-reducing
factor
(e.g.
sulfate)
increasing
(temperature,
time).
Higher
had
compensatory
counterbalancing
effect
on
reduction
caused
by
addition
sulfate.
significant
due
greater
number
ettringite
crystals
generated
hydration
products
produced
higher
and/or
longer
The
results
this
research
will
useful
for
efficient
design
long-distance
system
located
permafrost
warm
regions,
deep
well
containing
Materials,
Journal Year:
2023,
Volume and Issue:
16(11), P. 3995 - 3995
Published: May 26, 2023
The
utilization
of
solid
waste
for
filling
mining
presents
substantial
economic
and
environmental
advantages,
making
it
the
primary
focus
current
technology
development.
To
enhance
mechanical
properties
superfine
tailings
cemented
paste
backfill
(SCPB),
this
study
conducted
response
surface
methodology
experiments
to
investigate
impact
various
factors
on
strength
SCPB,
including
composite
cementitious
material,
consisting
cement
slag
powder,
tailings'
grain
size.
Additionally,
microanalysis
techniques
were
used
microstructure
SCPB
development
mechanisms
its
hydration
products.
Furthermore,
machine
learning
was
utilized
predict
under
multi-factor
effects.
findings
reveal
that
combined
effect
powder
dosage
slurry
mass
fraction
has
most
significant
influence
strength,
while
coupling
underflow
productivity
lowest
strength.
Moreover,
with
20%
highest
amount
products
complete
structure.
When
compared
other
commonly
prediction
models,
long-short
term
memory
neural
network
(LSTM)
constructed
in
had
accuracy
conditions,
root
mean
square
error
(RMSE),
correlation
coefficient
(R),
variance
account
(VAF)
reaching
0.1396,
0.9131,
81.8747,
respectively.
By
optimizing
LSTM
using
sparrow
search
algorithm
(SSA),
RMSE,
R,
VAF
improved
by
88.6%,
9.4%,
21.9%,
research
results
can
provide
guidance
efficient
tailings.
Arabian Journal of Chemistry,
Journal Year:
2023,
Volume and Issue:
16(8), P. 104977 - 104977
Published: May 8, 2023
Filling
mining
with
solid
waste
resources
as
aggregates
is
an
important
development
direction
for
cleaner
production
in
mines.
The
hydration
products
have
effect
on
the
mechanical
properties
of
superfine
tailings
cemented
paste
backfill
(SCPB).
This
paper
investigates
mechanism
product
formation
and
thermal
decomposition
SCPB
by
a
series
experiments
combined
kinetics.
Also,
to
optimize
SCPB,
Nano
SiO2
(NS)
related
investigated.
results
show
that
there
are
two
main
stages
kinetic
models
these
both
reaction
order
models.
After
adding
NS,
model
second
stage
changed
random
nucleation
growth
model.
substances
undergo
reactions
first
mainly
such
ettringite
C-S-H,
while
carbonates.
activation
energy
E
pre-exponential
factor
A
NS
added
significantly
improved,
which
indicates
more
stable
structure
its
products.
microscopic
test
can
promote
hydrolysis
C3S
gypsum
increase
products,
turn
improves
strength
SCPB.
In
addition,
addition
decreases
Ca/Si
increases
average
silica
chain
length
C-S-H
gels,
H2O/Si
group
increases,
resulting
enhancement
gels.
