1814 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
carbon content of 0.034% and V2O5 content of 1.00%.
It mainly contains minerals such as quartz, mica, barite,
and tridymite. The suitable roasting effects and leaching
indicators cannot be achieved solely through primary oxi-
dation roasting, and further high-temperature roasting is
necessary.
High-Temperature Reoxidation Roasting
High-temperature reoxidation roasting is the key to improv-
ing the V2O5 leaching rate. Because the lattice structure
of vanadium-containing minerals can be destroyed by
high temperatures, the leaching activity of vanadium is
improved. It further promotes the oxidation and dissolu-
tion of vanadium. The V2O5 leaching rate of roasted prod-
ucts with different roasting temperatures, gas flow, oxygen
content, and roasting time has been studied, and the results
are shown in Figure 5.
Under the conditions of 21% O2, roasting time of 1 h,
and total gas volume of 600 ml/min, the leaching rate of
V2O5 roasted at 650 °C, 700 °C, 750 °C, 800 °C, 850 °C,
950 °C and 1050 °C was studied. Figure 5(a) shows the
effect of temperature on the leaching rate of V2O5. With
the increase in temperature, the leaching rate curve showed
a trend of increasing first and then decreasing and formed
a peak at 850 °C~950 °C. The leaching rate of the sample
without reoxidation roasting was only 46.47%. When the
roasting temperature increased from 650 °C to 850 °C,
the leaching rate increased from 48.51% to 63.22%
When the temperature continues to rise, the leaching first
slowly increased to 63.49% and then decreased to 57.48%.
Figure 5. Effect of different roasting conditions on the V
2 O
5 leaching rate (a-temperature, b-airflow, c-O
2 content,d-roasting
time)
carbon content of 0.034% and V2O5 content of 1.00%.
It mainly contains minerals such as quartz, mica, barite,
and tridymite. The suitable roasting effects and leaching
indicators cannot be achieved solely through primary oxi-
dation roasting, and further high-temperature roasting is
necessary.
High-Temperature Reoxidation Roasting
High-temperature reoxidation roasting is the key to improv-
ing the V2O5 leaching rate. Because the lattice structure
of vanadium-containing minerals can be destroyed by
high temperatures, the leaching activity of vanadium is
improved. It further promotes the oxidation and dissolu-
tion of vanadium. The V2O5 leaching rate of roasted prod-
ucts with different roasting temperatures, gas flow, oxygen
content, and roasting time has been studied, and the results
are shown in Figure 5.
Under the conditions of 21% O2, roasting time of 1 h,
and total gas volume of 600 ml/min, the leaching rate of
V2O5 roasted at 650 °C, 700 °C, 750 °C, 800 °C, 850 °C,
950 °C and 1050 °C was studied. Figure 5(a) shows the
effect of temperature on the leaching rate of V2O5. With
the increase in temperature, the leaching rate curve showed
a trend of increasing first and then decreasing and formed
a peak at 850 °C~950 °C. The leaching rate of the sample
without reoxidation roasting was only 46.47%. When the
roasting temperature increased from 650 °C to 850 °C,
the leaching rate increased from 48.51% to 63.22%
When the temperature continues to rise, the leaching first
slowly increased to 63.49% and then decreased to 57.48%.
Figure 5. Effect of different roasting conditions on the V
2 O
5 leaching rate (a-temperature, b-airflow, c-O
2 content,d-roasting
time)