XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 1801
Acid Leaching Test
The acid leaching test flow was shown in Figure 4. The
roasted products were obtained from the suspension oxida-
tion roasting system. First, 50 g of the sample (feed ore or
roasted product) was placed in a 150 mL beaker. Next, a
certain amount of water and pure sulfuric acid were added
to the beaker in turn and mixed with the sample, which
was stirred in thermostatic water. The acid leaching dos-
age, leaching temperature, leaching time, and liquid-solid
ratio were set to meet the test requirements. After the leach-
ing process, the slurry was divided into leaching residue
and leching solution. Drying and weighing the leaching
residues, and analyzing the content of V2O5. The vanadium
leaching rate was calculated by the Equation (7).
η=[1 –(m1α)/(m2β)]×100% (7)
where η is V leaching rate (%),m1 and m2 are the weight of
leaching residue (g) and roasted residue (g), respectively. α
and β are the content of V2O5 of leaching residue (%)and
roasted residue (%),respectively.
RESULTS AND DISCUSSION
Effects of Leaching Parameters on Vanadium
Leaching Efficiency
Effect of Sulfuric Acid Dosage
Sulfuric acid dosage had an important impact on vanadium
leaching efficiency. In the sulfuric acid dosage test, the leach-
ing time was 15 min–360 min and the liquid-solid ratio was
1.5:1. In addition, the feed ore was leached under the con-
dition: leaching temperature of 95 °C, leaching acid dosage
of 20 wt.%–30 wt.% with 5 wt.% CaF2 as an aid-leaching
agent. The leaching condition of the roasted product was
a leaching temperature of 65 °C, a leaching acid dosage of
5 wt.%–15 wt.% with no CaF2. The test results are shown
in Figure 5. With the same leaching time, the vanadium
leaching efficiency improved with the increase of sulfuric
acid dosage. When the dosage increased from 5 wt.% to
15%, the vanadium leaching efficiency of roasted products
improved from 69.27% to 88.12% (under leaching time
of 6 h). Meanwhile, the vanadium leaching efficiency of
feed ore increased from 35.64% to 59.14% (under leaching
time of 6 h) with the sulfuric acid dosage increased from Figure 2. Vanadium phase distribution of feed ore
a: feed ore b: roasted product
Figure 3. Valence analysis of vanadium in samples
Acid Leaching Test
The acid leaching test flow was shown in Figure 4. The
roasted products were obtained from the suspension oxida-
tion roasting system. First, 50 g of the sample (feed ore or
roasted product) was placed in a 150 mL beaker. Next, a
certain amount of water and pure sulfuric acid were added
to the beaker in turn and mixed with the sample, which
was stirred in thermostatic water. The acid leaching dos-
age, leaching temperature, leaching time, and liquid-solid
ratio were set to meet the test requirements. After the leach-
ing process, the slurry was divided into leaching residue
and leching solution. Drying and weighing the leaching
residues, and analyzing the content of V2O5. The vanadium
leaching rate was calculated by the Equation (7).
η=[1 –(m1α)/(m2β)]×100% (7)
where η is V leaching rate (%),m1 and m2 are the weight of
leaching residue (g) and roasted residue (g), respectively. α
and β are the content of V2O5 of leaching residue (%)and
roasted residue (%),respectively.
RESULTS AND DISCUSSION
Effects of Leaching Parameters on Vanadium
Leaching Efficiency
Effect of Sulfuric Acid Dosage
Sulfuric acid dosage had an important impact on vanadium
leaching efficiency. In the sulfuric acid dosage test, the leach-
ing time was 15 min–360 min and the liquid-solid ratio was
1.5:1. In addition, the feed ore was leached under the con-
dition: leaching temperature of 95 °C, leaching acid dosage
of 20 wt.%–30 wt.% with 5 wt.% CaF2 as an aid-leaching
agent. The leaching condition of the roasted product was
a leaching temperature of 65 °C, a leaching acid dosage of
5 wt.%–15 wt.% with no CaF2. The test results are shown
in Figure 5. With the same leaching time, the vanadium
leaching efficiency improved with the increase of sulfuric
acid dosage. When the dosage increased from 5 wt.% to
15%, the vanadium leaching efficiency of roasted products
improved from 69.27% to 88.12% (under leaching time
of 6 h). Meanwhile, the vanadium leaching efficiency of
feed ore increased from 35.64% to 59.14% (under leaching
time of 6 h) with the sulfuric acid dosage increased from Figure 2. Vanadium phase distribution of feed ore
a: feed ore b: roasted product
Figure 3. Valence analysis of vanadium in samples