Vanadium recovery from oil fly ash by leaching, precipitation
Despite a lower leaching efficiency (compared to sulfuric acid), sodium hydroxide was selected for vanadium leaching since it is more selective for vanadium (versus other transition metals). Precipitation was preferred to solvent extraction for the second step in the treatment since: (a) it is more selective; enabling complete recovery of vanadate from the leachate in the form of pure ammonium vanadate; and (b) stripping of the loaded organic phase (in the solvent extraction process) was not
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Vanadium element extraction methods smelting, leaching
The general process of obtaining vanadium from its ores is in the form of vanadium pentoxide (V 2 O 5) through performing a variety of processes like smelting, leaching, and roasting after which the pentoxide is reduced to ferrovanadium or vanadium powder. Very pure vanadium metal resembles titanium with respect to certain physical properties of being corrosion resistant, hard, and steel gray in colour.
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