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1. (WO2018165524) VANADIUM RECOVERY METHOD

Pub. No.:    WO/2018/165524    International Application No.:    PCT/US2018/021700
Publication Date: Fri Sep 14 01:59:59 CEST 2018 International Filing Date: Sat Mar 10 00:59:59 CET 2018
IPC: C22B 34/22
C22B 7/00
C22B 1/04
C22B 3/04
Applicants: WORCESTER POLYTECHNIC INSTITUTE
Inventors: JUNG, Myungwon
MISHRA, Brajendra
Title: VANADIUM RECOVERY METHOD
Abstract:
A vanadium recovery approach utilizes oil fly ash (OFA), in contrast to coal fly ash, for separation and recovery of vanadium. OFA is first carbon burned to reduce the volume for recycling, and also to provide a fuel for other industrial processes. Following an almost 90% weight reduction from carbon burning, the remaining material includes about 18% vanadium. A salt roasting performed at the same temperature (about 650° C) as the carbon burning allows use of the same oven or furnace, reducing heat requirements for the overall process. Salt roasting generates a water-soluble material from which a water leaching process yields a vanadium leach solution containing recovered vanadium, avoiding a need for caustic or volatile leaching agents. Ammonium metavanadate is precipitated from the vanadium leach solution through addition of ammonium sulfate, and a calcination process used to generate vanadium oxide (V2O5).