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The recovery of vanadium from oil-fired boiler slag was examined, using the techniques of direct leaching and subsequent solvent extraction. Hydrochloric acid leaching showed the best extraction capability for vanadium and other metals in the oil-fired boiler slag. Sodium hydroxide leaching had the highest selectivity for vanadium. A combination of these two leaching methods hastened the recovery of metals and the separation of vanadium. Alternative processes of solvent extraction employed for metal separation from the leachate with a computer program and the best selected process was verified experimentally. As a result 94 %of the vanadium in the oil-fired boiler slag was recovered in pure solution form.

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