Patent ID: 8574341
Filing Date: 2013-11-05
Classification: C22B,Y02P

Abstract:
1. A method for recycling metals from waste tungsten catalysts, comprising steps of: leaching, by soaking a waste tungsten catalysts into a highly oxidized acid and conducting a reaction between sulfur of the waste tungsten catalysts and the acid to obtain sulfide and oxidized acidic groups, wherein metals in the waste tungsten catalysts are dissolved and oxidized by the acid to obtain a first solution and dregs, wherein the highly oxidized acid is selected from one of nitric acid, hydrochloric acid, nitrous acid, hypochlorous acid, chlorous acid and perchloride acid; and refining, by extracting metals of the waste tungsten catalysts from the first solution; wherein, the oxidized acidic groups obtained from the step of leaching is converted into highly oxidized acid, which is capable of being recycled.