XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 1803
ions and improve the purity of the vanadium product(Hu
et al, 2021 Liu et al., 2020 Xue et al., 2017).
Effect of Leaching Temperature
The leaching temperature had a great impact on the dif-
fusion rate of sulfuric acid to the surface and inside of
the particles and the activity of chemical reactions during
the leaching process. In the leaching temperature test, the
leaching time was 15 min–360 min, the liquid-solid ratio
was 1.5:1, and the leaching temperatures were 45 °C–95
°C. In addition, the sulfuric acid dosage of roasted product
was 10 wt.% while it of feed ore was 30 wt.% and with
5 wt.% CaF2. The results of the leaching temperature test
are shown in Figure 6. The vanadium leaching efficiency
of feed ore increased from 45.17% to 59.14% (leaching
time of 6 h) with the temperature rise from 45 °C to 95 °C.
Meanwhile, it of roasted products increased from 74.28%
to 83.65% (leaching time of 6 h). When the temperature
increased from 65 °C to 95 °C, the increase rate of leaching
efficiency of the roasted product increased and the leaching
efficiency changed little in 6 h. However, when the temper-
ature was 95 °C, the vanadium leaching efficiency of feed
ore was higher than others at any time point. It was indi-
cated that high leaching temperature could promote the
lattice damage of vanadium-bearing minerals in feed ore
during the leaching process. Comparing the change law of
vanadium leaching efficiency of these two minerals, dem-
onstrated that the suspension oxidation roasting process
strengthened the destruction effect of vanadium-bearing
mineral lattice.
Effect of Liquid-Solid Ratio
Liquid-solid ratio played an important role in adjusting
slurry viscosity and mass transfer efficiency. In liquid-solid
ratio experiments, the leaching time was 15 min–360 min
and the liquid-solid ratios were 1.5:1, 3:1, and 5:1. The
sulfuric acid dosage was 30 wt.% with 5 wt.% CaF2 and
the leaching temperature was 95 °C. As for the roasted
product, the sulfuric acid dosage was 10 wt.% and the
leaching temperature was 65 °C. The results are shown
in Figure 7. At different liquid-solid ratios, the vanadium
leaching efficiency of different samples increased with the
extension of leaching time. When the leaching time was 15
min, the vanadium leaching efficiency of roasted products
was 66.00% (L: S=1.5:1), 69.02% (L: S=3:1), and 68.20%
(L: S=5:1), respectively, while the vanadium leaching effi-
ciency of feed ores was 43.01% (L: S=1.5:1), 44.25% (L:
S=3:1), and 42.45% (L: S=5:1), respectively. When the
leaching time prolonged to 360 min, the vanadium leach-
ing efficiency of roasted products was 82.31% (L: S=1.5:1),
Figure 6. The effect of leaching temperature on vanadium leaching efficiency
ions and improve the purity of the vanadium product(Hu
et al, 2021 Liu et al., 2020 Xue et al., 2017).
Effect of Leaching Temperature
The leaching temperature had a great impact on the dif-
fusion rate of sulfuric acid to the surface and inside of
the particles and the activity of chemical reactions during
the leaching process. In the leaching temperature test, the
leaching time was 15 min–360 min, the liquid-solid ratio
was 1.5:1, and the leaching temperatures were 45 °C–95
°C. In addition, the sulfuric acid dosage of roasted product
was 10 wt.% while it of feed ore was 30 wt.% and with
5 wt.% CaF2. The results of the leaching temperature test
are shown in Figure 6. The vanadium leaching efficiency
of feed ore increased from 45.17% to 59.14% (leaching
time of 6 h) with the temperature rise from 45 °C to 95 °C.
Meanwhile, it of roasted products increased from 74.28%
to 83.65% (leaching time of 6 h). When the temperature
increased from 65 °C to 95 °C, the increase rate of leaching
efficiency of the roasted product increased and the leaching
efficiency changed little in 6 h. However, when the temper-
ature was 95 °C, the vanadium leaching efficiency of feed
ore was higher than others at any time point. It was indi-
cated that high leaching temperature could promote the
lattice damage of vanadium-bearing minerals in feed ore
during the leaching process. Comparing the change law of
vanadium leaching efficiency of these two minerals, dem-
onstrated that the suspension oxidation roasting process
strengthened the destruction effect of vanadium-bearing
mineral lattice.
Effect of Liquid-Solid Ratio
Liquid-solid ratio played an important role in adjusting
slurry viscosity and mass transfer efficiency. In liquid-solid
ratio experiments, the leaching time was 15 min–360 min
and the liquid-solid ratios were 1.5:1, 3:1, and 5:1. The
sulfuric acid dosage was 30 wt.% with 5 wt.% CaF2 and
the leaching temperature was 95 °C. As for the roasted
product, the sulfuric acid dosage was 10 wt.% and the
leaching temperature was 65 °C. The results are shown
in Figure 7. At different liquid-solid ratios, the vanadium
leaching efficiency of different samples increased with the
extension of leaching time. When the leaching time was 15
min, the vanadium leaching efficiency of roasted products
was 66.00% (L: S=1.5:1), 69.02% (L: S=3:1), and 68.20%
(L: S=5:1), respectively, while the vanadium leaching effi-
ciency of feed ores was 43.01% (L: S=1.5:1), 44.25% (L:
S=3:1), and 42.45% (L: S=5:1), respectively. When the
leaching time prolonged to 360 min, the vanadium leach-
ing efficiency of roasted products was 82.31% (L: S=1.5:1),
Figure 6. The effect of leaching temperature on vanadium leaching efficiency