Chemical Engineering & Technology,
Journal Year:
2023,
Volume and Issue:
46(8), P. 1619 - 1629
Published: May 16, 2023
Abstract
An
experimental
evaluation
of
the
flow
field
on
two
high‐gravity
spiral
concentrators
is
presented
along
with
analytical
solutions.
A
digital
depth
gauge
was
used
to
measure
liquid
level
troughs.
The
tracer
particle
trajectories
and
free
surface
velocity
a
were
determined
high‐speed
camera.
increase
in
rate
leads
an
trough
surface.
Three
full
turns
high
gravity
concentrator
are
sufficient
for
achieving
stabilized
flow.
High‐gravity
spirals
show
lower
depths
velocities
but
steeper
outer
zone
than
low‐gravity
spirals.
Higher
contribute
larger
circulation
zones,
which
eventually
help
greater
separation
heavier
minerals
from
gangue
particles.
Energies,
Journal Year:
2023,
Volume and Issue:
16(5), P. 2432 - 2432
Published: March 3, 2023
In
this
study,
the
microencapsulation-hybrid
jig
separation
technique
was
developed
to
improve
efficiency
of
pyrite
and
coal
in
particle
size
range
1–4
mm
where
conventional
becomes
inefficient.
A
hybrid
is
a
gravity
concentrator
combining
concepts
flotation
stratify
particles
based
on
their
apparent
specific
gravity.
Meanwhile,
microencapsulation—a
that
encapsulates
target
materials
with
protective
coating—was
applied
render
hydrophilic
its
from
hydrophobic
coal.
The
results
showed
required
time
for
(0.5
min)
shorter
than
(2
min).
Moreover,
effects
were
reduced
when
used.
However,
lower
because
attachment
bubbles
occurred
both
coal,
which
are
hydrophobic.
Using
technique,
significantly
improved
(~100%)
formation
iron
phosphate
coatings
limited
bubble
attachment.
This
means
promising
clean
technology
not
only
enhances
but
also
passivates
limits
AMD
tailings/rejects.
Energies,
Journal Year:
2024,
Volume and Issue:
17(16), P. 4133 - 4133
Published: Aug. 20, 2024
This
article
presents
the
results
of
an
analysis
aimed
at
verifying
relationship
between
implementation
SDG
Goal
7
and
use
clean
coal
technologies
in
Poland.
Clean
United
Nations
plans
will
constitute
a
crucial
element
strategy
for
sustainable
development
energy
context.
They
are
intended
to
be
one
tools
building
system
based
on
renewable
sources,
constituting
bridge
that
enables
transition
Poland’s
from
sources.
To
identify
whether
this
exists,
Autoregressive
Moving
Average
with
Exogenous
Input
(ARMAX)
model
was
used.
The
structure
model,
its
correctness,
accuracy
were
confirmed
using
information
criteria;
statistical
tests
such
as
Dickey-Fuller,
Doornik-Hansen,
Durbin-Watson,
Breusch-Pagan;
measures
prediction
MAPE,
MAE,
RMSE.
explanatory
variables
Objective
indicators
adopted
by
Eurostat.
Before
being
introduced
ARMAX
they
standardized
Compound
Annual
Growth
Rate
(CAGR)
indicator.
made
it
possible
indicate
which
has
greatest
impact
Poland,
determine
synthetic
CAGR
measure
all
variables,
compare
obtained
indicator
determined
Nations.
