XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 1623
3. The cavitation effect of ultrasound can smash the
vanadium-bearing shale particles into smaller ones
and generate lots of holes and cracks on the sur-
face of the vanadium-bearing muscovite, which is
conducive to the mass transfer and diffusion of the
lixiviant. Hence, the destruction of the structure
of muscovite is serious, and then vanadium is eas-
ily released from the lattice and dissolved into the
solution with the oxidation of NaClO3.
REFERENCES
Bao S, Chen B, Zhang Y, 2020. Research status and pros-
pect of vanadium extraction technology for vanadium-
bearing shale in China. Metal Mine, (10): 20–33.
Bao S, Chen B, Zhang Y, et al., 2023. A comprehensive
review on the ultrasound-enhanced leaching recov-
ery of valuable metals: Applications, mechanisms and
prospects. Ultrasonics Sonochemistry, 98: 106525.
Cai Z, Zhang Y, Liu T, et al., 2015. Vanadium extraction
from refractory stone coal using novel composite addi-
tive. JOM, 67(11): 2629–2634.
Chang J, Zhang E, Zhang L, et al., 2017. A comparison
of ultrasound-augmented and conventional leach-
ing of silver from sintering dust using acidic thiourea.
Ultrasonics Sonochemistry, 34: 222–231.
Figure 8(c) and (f), the vanadium is partly concentrated on
the surface of the muscovite particles in the CL residues,
while almost no vanadium element is detected on that in
UAL residues. These outcomes demonstrate that the vana-
dium is more completely released from the lattice of the
muscovite with the introduction of ultrasound in compari-
son to the CL process.
CONCLUSIONS
In this study, ultrasound-assisted leaching (UAL) technique
is introduced to the whole hydrometallurgical leaching
process of vanadium from vanadium-bearing shale so as
to resolve corresponding issues existed during the conven-
tional leaching (CL) process.
1. Under the optimal leaching conditions, the leach-
ing ratio of vanadium in CL system was only
78.06%, while that in the UAL system reached
89.27%. In particular, the leaching duration was
obviously reduced from 10 h to 3 h with the intro-
duction of ultrasound.
2. The leaching process of vanadium from vana-
dium-bearing shale in these two systems is both
controlled by product diffusion. Nevertheless, the
leaching rate constant for the UAL system is much
higher than that for the CL system, leading to the
high leaching ratio of vanadium at shorter leaching
duration.
Figure 8. Microstructure of the leaching residues obtained from CL (a)-(c) and UAL (d)-(f) systems
3. The cavitation effect of ultrasound can smash the
vanadium-bearing shale particles into smaller ones
and generate lots of holes and cracks on the sur-
face of the vanadium-bearing muscovite, which is
conducive to the mass transfer and diffusion of the
lixiviant. Hence, the destruction of the structure
of muscovite is serious, and then vanadium is eas-
ily released from the lattice and dissolved into the
solution with the oxidation of NaClO3.
REFERENCES
Bao S, Chen B, Zhang Y, 2020. Research status and pros-
pect of vanadium extraction technology for vanadium-
bearing shale in China. Metal Mine, (10): 20–33.
Bao S, Chen B, Zhang Y, et al., 2023. A comprehensive
review on the ultrasound-enhanced leaching recov-
ery of valuable metals: Applications, mechanisms and
prospects. Ultrasonics Sonochemistry, 98: 106525.
Cai Z, Zhang Y, Liu T, et al., 2015. Vanadium extraction
from refractory stone coal using novel composite addi-
tive. JOM, 67(11): 2629–2634.
Chang J, Zhang E, Zhang L, et al., 2017. A comparison
of ultrasound-augmented and conventional leach-
ing of silver from sintering dust using acidic thiourea.
Ultrasonics Sonochemistry, 34: 222–231.
Figure 8(c) and (f), the vanadium is partly concentrated on
the surface of the muscovite particles in the CL residues,
while almost no vanadium element is detected on that in
UAL residues. These outcomes demonstrate that the vana-
dium is more completely released from the lattice of the
muscovite with the introduction of ultrasound in compari-
son to the CL process.
CONCLUSIONS
In this study, ultrasound-assisted leaching (UAL) technique
is introduced to the whole hydrometallurgical leaching
process of vanadium from vanadium-bearing shale so as
to resolve corresponding issues existed during the conven-
tional leaching (CL) process.
1. Under the optimal leaching conditions, the leach-
ing ratio of vanadium in CL system was only
78.06%, while that in the UAL system reached
89.27%. In particular, the leaching duration was
obviously reduced from 10 h to 3 h with the intro-
duction of ultrasound.
2. The leaching process of vanadium from vana-
dium-bearing shale in these two systems is both
controlled by product diffusion. Nevertheless, the
leaching rate constant for the UAL system is much
higher than that for the CL system, leading to the
high leaching ratio of vanadium at shorter leaching
duration.
Figure 8. Microstructure of the leaching residues obtained from CL (a)-(c) and UAL (d)-(f) systems
