Patent ID: 8986634
Filing Date: 2015-03-24
Classification: C22B,Y02P

Abstract:
1. A method for recovering metals from waste aluminum catalysts, comprising: roasting a waste aluminum catalyst with sodium salts, leaching the roasted waste aluminum catalyst, and then filtering the leached waste aluminum catalyst to obtain a first solution and a dreg, wherein the first solution comprises vanadium and molybdenum, and the dreg comprises nickel and aluminum; collecting and mixing the dreg with alkali powder to obtain a mixture of the dreg and the alkali powder, roasting the mixture at 300 to 1000° C. with aluminum in the dreg reacting with hydroxyl generated from the roasting of the mixture and further generating aluminum hydroxide, leaching the roasted mixture, and then filtering the leached mixture to obtain a second solution comprising aluminum and a concentrate comprising nickel; and recovering aluminum and nickel by precipitating aluminum and nickel from the second solution and the concentrate respectively.