METHOD OF RECOVERING VALUABLE METALS FROM THE VRDS SPENT CATALYST

摘要

The present invention discloses method of recovering valuable metals, suc h as vanadium, molybdenum, nickel from the catalysts spent in the VRDS proce ss for desulfurization of pertoleum. The method comprises leaching water-ins oluble reactants after reacting the pre-treated waste crystals in solution o f sodium hydroxide, maintaining the filtrate at pH 9.5 by adding sulfhuric a cid or hydrochloric acid and then heating the filtrate, removing aluminium o xide from the soltuion, aerating the filtrate continously or priodically and agitating the filtrate below pH 1 at 80-100 °C, thereby precipitating molyb denum oxide and vanadium oxide, and leaching and washing the precipitated mo lybdenum oxide and vanadium oxide.