2130 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
Figure 4 presents the FT-IR spectra of DTP, pyrite,
pyrite treated with ultrasonic, pyrite treated with DTP, and
pyrite treated with DTP and 20 minutes of ultrasonic. The
DTP spectrum, in the region between 1100 and 900 cm–1,
were attributed to the P-O-C asymmetric stretching vibra-
tion. The bands between 830 and 680 cm–1 corresponds
to the P-O-C symmetric stretching vibration. Then, the
bands between 575 and 510 cm–1 were attributed to P-S
stretching mode (Dhar et al., 2019). Also, the OH at 3424
cm–1 was attributed to the alcohol, and CH in the region
between 3000 and 2800 cm–1 were attributed to alkyl
groups characteristics of DTP collector. Then, the pyrite
+DTP spectrum shows the adsorption of collector onto
pyrite surface in the region between 1100 and 900 cm–1,
attributed to the P-O-C asymmetric stretching vibration,
and between 830 and 680 cm–1 attributed to the P-O-C
symmetric stretching vibration. The presence of P-S was
negligible (see the enhanced area). This demonstrated the
adsorption of DTP collector onto pyrite surface. Finally,
the pyrite+DTP+20 min ultrasonic shows that the ultra-
sonic does not have an influence in the decomposition of
DTP, even at high ultrasonic time (20 minutes) the DTP
decomposition was not reached. Therefore, it seems like
ultrasonic treatment is not a good alternative to eliminate
the collector adsorbed onto pyrite surface.
Hydrogen Peroxide Treatment
Figure 5 exhibits the FT-IR spectra PAX, pyrite treated
with PAX, pyrite+PAX treated with 0.001M, 0.01M and
0.1 M of H2O2. As it was before mentioned the adsorption
of PAX onto pyrite was identified. Then, the pyrite +PAX
treated with different H2O2 concentrations shows that high
H2O2 concentrations enables the decomposition of PAX
collector since the species C=O and O=S=O appear gradu-
ally with increasing H2O2 concentration. This confirms
that H2O2 is a suitable reagent for PAX decomposition
from pyrite surface. Figure 6 presents the FT-IR spectra of
DTP, pyrite treated with DTP, pyrite+DTP treated with
0.001M, 0.01M and 0.1M of H2O2. As it was before men-
tioned the adsorption of DTP onto pyrite was identified.
Then, the pyrite +DTP treated with different H2O2 con-
centrations shows that high H2O2 concentrations enables
the elimination of DTP collector. This confirms that H2O2
is a suitable reagent for DTP elimination from pyrite sur-
face. Nevertheless, in the spectrum pyrite+DTP treated
with 0.1M of H2O2 it was not possible to identify oxidized
species from the pyrite or the sulfate species from the DTP
decomposition. Only we got that the bands correspond-
ing to collector adsorption disappear from the spectrum.
Therefore, according to these results is not possible yet to
propose an interaction mechanism between pyrite surface,
Figure 4. Infrared spectra of pyrite before and after treatment with DTP and ultrasonic
Figure 4 presents the FT-IR spectra of DTP, pyrite,
pyrite treated with ultrasonic, pyrite treated with DTP, and
pyrite treated with DTP and 20 minutes of ultrasonic. The
DTP spectrum, in the region between 1100 and 900 cm–1,
were attributed to the P-O-C asymmetric stretching vibra-
tion. The bands between 830 and 680 cm–1 corresponds
to the P-O-C symmetric stretching vibration. Then, the
bands between 575 and 510 cm–1 were attributed to P-S
stretching mode (Dhar et al., 2019). Also, the OH at 3424
cm–1 was attributed to the alcohol, and CH in the region
between 3000 and 2800 cm–1 were attributed to alkyl
groups characteristics of DTP collector. Then, the pyrite
+DTP spectrum shows the adsorption of collector onto
pyrite surface in the region between 1100 and 900 cm–1,
attributed to the P-O-C asymmetric stretching vibration,
and between 830 and 680 cm–1 attributed to the P-O-C
symmetric stretching vibration. The presence of P-S was
negligible (see the enhanced area). This demonstrated the
adsorption of DTP collector onto pyrite surface. Finally,
the pyrite+DTP+20 min ultrasonic shows that the ultra-
sonic does not have an influence in the decomposition of
DTP, even at high ultrasonic time (20 minutes) the DTP
decomposition was not reached. Therefore, it seems like
ultrasonic treatment is not a good alternative to eliminate
the collector adsorbed onto pyrite surface.
Hydrogen Peroxide Treatment
Figure 5 exhibits the FT-IR spectra PAX, pyrite treated
with PAX, pyrite+PAX treated with 0.001M, 0.01M and
0.1 M of H2O2. As it was before mentioned the adsorption
of PAX onto pyrite was identified. Then, the pyrite +PAX
treated with different H2O2 concentrations shows that high
H2O2 concentrations enables the decomposition of PAX
collector since the species C=O and O=S=O appear gradu-
ally with increasing H2O2 concentration. This confirms
that H2O2 is a suitable reagent for PAX decomposition
from pyrite surface. Figure 6 presents the FT-IR spectra of
DTP, pyrite treated with DTP, pyrite+DTP treated with
0.001M, 0.01M and 0.1M of H2O2. As it was before men-
tioned the adsorption of DTP onto pyrite was identified.
Then, the pyrite +DTP treated with different H2O2 con-
centrations shows that high H2O2 concentrations enables
the elimination of DTP collector. This confirms that H2O2
is a suitable reagent for DTP elimination from pyrite sur-
face. Nevertheless, in the spectrum pyrite+DTP treated
with 0.1M of H2O2 it was not possible to identify oxidized
species from the pyrite or the sulfate species from the DTP
decomposition. Only we got that the bands correspond-
ing to collector adsorption disappear from the spectrum.
Therefore, according to these results is not possible yet to
propose an interaction mechanism between pyrite surface,
Figure 4. Infrared spectra of pyrite before and after treatment with DTP and ultrasonic