Method for selective recovery of molybdenum and vanadium values from spent catalysts

摘要: The invention provides a novel method for selectively recovering molybdenumnd vanadium values from spent catalyst used the hydrogenation desulfurization of petroleums by extraction with an alkaline extractant solution without necessity preliminary calcination containing, in addition to molybdenum and values, nickel, cobalt other heavy metals as well sulfur carbonaceous matters contaminants supported or deposited on alumina carrier. inventive utilizes aqueous sodium carbonate admixture hydrogen peroxide oxidizing agent whereby unexpectedly high percent is obtained reaching 99% higher former about 85% latter while aluminum can be minimized.