2498 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
Pb2+ to the solution respectively, and performing UV spec-
troscopy after 5 minutes of action, analyzing the changes of
absorption peaks, then getting the Pb2+ UV titration curve
of MSA by the changes of peaks.
m
C Ch V
0 #
C =
-^(3)
where,
Γ =adsorption amount of the agent on the mineral
surface
C0 =initial concentration of the agent in the slurry
before interacting with the mineral
C =concentration of the agent in the slurry after
interacting with minerals
V =pulp volume m: mineral quality.
XPS Measurements
X-ray photoelectron spectroscopy (XPS) was conducted
using an ESCALAB 250Xi spectrometer (ThermoFisher
USA). The analysis chamber was maintained under a
vacuum pressure of 8×10–10 Pa, and the excitation source
employed was Al Kα X-ray radiation (hv =1486.6 eV).
Approximately 2.0 grams of the mineral, mixed with MSA
solution and pH-adjusted, was stirred, filtered, and vacuum
dried. The samples underwent XPS analysis, with data pro-
cessing done via Avantage 5.977 software. The 284.8 eV
C1s peak served as the calibration reference
RESULTS AND DISCUSSION
Micro-Flotation Tests Results
The micro-flotation experiments focused on assessing the
impact of Mercaptosuccinic Acid (MSA) and Phosphorknox
on the floatability of molybdenite and galena. As evidenced
in Figure 3, increasing inhibitor dosages correlated with a
marked decrease in galena recovery, while molybdenite’s
recovery remained relatively unchanged, above 95%.
Notably, at an inhibitor concentration of 4.5 mg/L, galena’s
recovery with MSA plummeted to 5.78%, outperforming
Phosphorknox, which resulted in a 7.99% recovery. These
findings underscore MSA’s superior inhibitory capacity over
Phosphorknox, highlighting its potential as a more effective
alternative for suppressing galena flotation in molybdenum
processing.
In examining the pH dependency of the inhibitory
effectiveness of MSA and Phosphorknox (Figure 4), the
tests revealed that MSA maintains its superiority across
different pH levels, suggesting a robust, pH-independent
performance.
Artificial mineral mix tests (Figure 5 and 6) further
corroborated MSA’s enhanced selectivity. With an MSA
dosage of 10 mg/L, molybdenum recovery in the concen-
trate reached 91.27%, while lead recovery was reduced to
23.41%, yielding a Mo-Pb separation coefficient of 5.85.
Comparatively, Phosphorknox achieved a separation coeffi-
cient of 5.30 under similar conditions. These results bolster
the assertion that MSA not only surpasses Phosphorknox in
galena inhibition but also enhances the Mo-Pb separation
efficiency.
0 2 4 6 8 10
0
20
40
60
80
100
Dosage(mg/L)
Galena with Phosphorknox
Molybdenum withPhosphorknox
Galena with MSA
Molybdenum with MSA
Figure 3. The influence of different depressant
dosages on the floatability of molybdenite and galena
(pH=6.8±0.2MIBC: 10 mg/L, Diesel: 15 mg/L)
2 4 6 8 10 12
0
20
40
60
80
100
pH
Galena with phosphorknox
molybdenum with phosphorknox
Galena with MSA
molybdenum with MSA
Figure 4. The influence of pH change on the depressanty
properties of MSA and Phosphorknox
Recovery(%)
Recovery(%)
Pb2+ to the solution respectively, and performing UV spec-
troscopy after 5 minutes of action, analyzing the changes of
absorption peaks, then getting the Pb2+ UV titration curve
of MSA by the changes of peaks.
m
C Ch V
0 #
C =
-^(3)
where,
Γ =adsorption amount of the agent on the mineral
surface
C0 =initial concentration of the agent in the slurry
before interacting with the mineral
C =concentration of the agent in the slurry after
interacting with minerals
V =pulp volume m: mineral quality.
XPS Measurements
X-ray photoelectron spectroscopy (XPS) was conducted
using an ESCALAB 250Xi spectrometer (ThermoFisher
USA). The analysis chamber was maintained under a
vacuum pressure of 8×10–10 Pa, and the excitation source
employed was Al Kα X-ray radiation (hv =1486.6 eV).
Approximately 2.0 grams of the mineral, mixed with MSA
solution and pH-adjusted, was stirred, filtered, and vacuum
dried. The samples underwent XPS analysis, with data pro-
cessing done via Avantage 5.977 software. The 284.8 eV
C1s peak served as the calibration reference
RESULTS AND DISCUSSION
Micro-Flotation Tests Results
The micro-flotation experiments focused on assessing the
impact of Mercaptosuccinic Acid (MSA) and Phosphorknox
on the floatability of molybdenite and galena. As evidenced
in Figure 3, increasing inhibitor dosages correlated with a
marked decrease in galena recovery, while molybdenite’s
recovery remained relatively unchanged, above 95%.
Notably, at an inhibitor concentration of 4.5 mg/L, galena’s
recovery with MSA plummeted to 5.78%, outperforming
Phosphorknox, which resulted in a 7.99% recovery. These
findings underscore MSA’s superior inhibitory capacity over
Phosphorknox, highlighting its potential as a more effective
alternative for suppressing galena flotation in molybdenum
processing.
In examining the pH dependency of the inhibitory
effectiveness of MSA and Phosphorknox (Figure 4), the
tests revealed that MSA maintains its superiority across
different pH levels, suggesting a robust, pH-independent
performance.
Artificial mineral mix tests (Figure 5 and 6) further
corroborated MSA’s enhanced selectivity. With an MSA
dosage of 10 mg/L, molybdenum recovery in the concen-
trate reached 91.27%, while lead recovery was reduced to
23.41%, yielding a Mo-Pb separation coefficient of 5.85.
Comparatively, Phosphorknox achieved a separation coeffi-
cient of 5.30 under similar conditions. These results bolster
the assertion that MSA not only surpasses Phosphorknox in
galena inhibition but also enhances the Mo-Pb separation
efficiency.
0 2 4 6 8 10
0
20
40
60
80
100
Dosage(mg/L)
Galena with Phosphorknox
Molybdenum withPhosphorknox
Galena with MSA
Molybdenum with MSA
Figure 3. The influence of different depressant
dosages on the floatability of molybdenite and galena
(pH=6.8±0.2MIBC: 10 mg/L, Diesel: 15 mg/L)
2 4 6 8 10 12
0
20
40
60
80
100
pH
Galena with phosphorknox
molybdenum with phosphorknox
Galena with MSA
molybdenum with MSA
Figure 4. The influence of pH change on the depressanty
properties of MSA and Phosphorknox
Recovery(%)
Recovery(%)