Recovery of vanadium from heavy oil and Orimulsion fly ashes

This work concerns a three-step process for the recovery of vanadium from h eavy oil and Orimulsion combustion fly ashes. This consisted of acid leachi ng, oxidation and precipitation of the vanadium pentoxide, followed by wash ing of the precipitate. Preliminary tests were conducted to investigate the effect of some operating parameters for the various steps of the process. After these preliminary tests, the recovery of vanadium from the fly ash sa mples was performed on a laboratory scale and the overall yield of the proc ess was determined. By washing the precipitate, it was possible to reduce t he concentration of the impurities and to allow its use for the production of ferrovanadium alloys. (C) 2000 Elsevier Science B.V. All rights reserved .