Minerals,
Journal Year:
2024,
Volume and Issue:
14(10), P. 968 - 968
Published: Sept. 25, 2024
In
Slovakia,
around
200
environmental
burdens
that
contain
a
significant
amount
of
usable
raw
materials
were
created
by
the
extraction
ores
or
dumping
industrial
waste.
this
research,
hydrometallurgical
metal
recovery
method
from
metal-bearing
landfill
in
Sereď
was
investigated.
The
analysis
representative
sample
waste
obtained
proved
presence
amounts
metals
(43.45%
Fe;
1.3%
Cr;
0.09%
Co,
and
0.23%
Ni).
A
thermodynamic
study
metals’
(Fe,
Cr,
Ni,
Co)
leaching
probability
confirmed
possibility
an
acidic
environment.
Subsequently,
effect
most
important
factors
on
process
(stirring
intensity,
temperature,
liquid-to-solid
phase
ratio,
acid
concentration)
experimentally
tested.
results
determined
optimal
conditions.
90.35%
Fe
59.62%
Cr
ensured
at
stirring
intensity
400
rpm,
temperature
80
°C,
ratio
40,
H2SO4
concentration
3
mol/dm3.
Various
techniques,
including
SEM,
EDX,
XRD,
Eh-pH
diagrams,
AAS
analysis,
used
to
analyze
samples
products
after
leaching.
precipitating
metals/compounds
leachate
obtain
marketable
product
theoretically
proposed
proven.
Molecules,
Journal Year:
2025,
Volume and Issue:
30(7), P. 1591 - 1591
Published: April 2, 2025
The
traditional
alkaline
process
used
to
prepare
sodium
stannate
faces
the
challenges
of
high
temperature,
low
utilization
rate,
and
large
hydrogen
peroxide
consumption,
which
is
mainly
due
oxidation
dissolution
efficiency
tin.
Here,
a
new
by
ultrasonic-enhanced
tin
at
room
temperature
was
proposed.
effects
ultrasonic
power,
hydroxide
concentration,
dosage,
time
on
were
systematically
investigated.
results
show
that
method
with
cost.
At
as
99.3%
under
ultrasound,
28%
higher
than
conventional
same
conditions.
introduction
ultrasound
promoted
generation
strong
oxidizing
hydroxyl
radicals
(·OH)
from
peroxide,
significantly
improved
surface
roughness
sheet
6.875
μm
in
treatment
34.135
treatment,
destroyed
passivation
layer
sheet,
thereby
improving
Compared
conditions,
could
decrease
reaction
30
°C,
reduce
consumption
33.3%,
save
15%
while
achieving
effect.
This
technology
provides
ideas
for
this
valuable
metal.
Recent Innovations in Chemical Engineering (Formerly Recent Patents on Chemical Engineering),
Journal Year:
2024,
Volume and Issue:
17(4), P. 256 - 280
Published: Aug. 12, 2024
Abstract:
The
current
understanding
and
development
of
monazite
decomposition
technology
using
sodium
hydroxide
are
examined.
Most
previous
assessments
have
primarily
focused
on
the
post-leaching
processing
hydroxide,
including
steps
to
produce
total
rare
earth
oxide
product.
However,
initial
leaching
process
with
alkali
solution
proves
be
highly
significant
in
practice.
It
presents
numerous
problems,
such
as
requirement
for
fine
grinding
ore
down
below
45
microns,
substantial
excess,
extended
reaction
times
achieve
desired
efficiency.
These
requirements
result
increased
energy,
chemical,
equipment
costs.
This
article
is
discussing
conditions
based
published
literature,
problems
associated
this
process,
underlying
reasons,
newly
proposed
variations
under
pressure
a
heated
ball
mill,
limitations
these
variations,
unresolved
issues.
Furthermore,
manuscript
introduces
novel
technique,
high-intensity
ultrasound,
support
which
has
been
applied
technological
cases.
discussion
delves
into
mechanisms
ultrasound
its
applicability
hydroxide.
