Abstract
The oxidative precipitation of vanadium(IV) from its sulfate solutions with ozone has been investigated. During the ozonation, the solution pH was maintained constant by consuming the liberated hydrogen ion with drops of KOH solution. Chemical analysis of the precipitates showed that the values of x and y for the final solid product, KxV2Oy are from 0.30-0.47 (depending on pH) and 5.0, respectively. X-ray diffraction revealed that these potassium-incorporating vanadium(V) oxides have the basic structure of V2O5. The progress of oxidation of vanadium(IV) and precipitation of vanadium(V) were monitored by determining the concentrations of vanadium(IV) and vanadium(V) remaining in the solution and by ORP measurement. The rate of ozonation of vanadium(IV) increases with increasing pH, while the precipitation of vanadium(V) proceeds favourably at pH 1.5 at 25 °C and at pH 2.0 at 70 °C. A rise in temperature accelerates the oxidative precipitation of vanadium(IV) to make recovery of vanadium ion effective.
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