Patent ID: 9580826
Date: 2017-02-28
CPC Classifications: C22B,C25C,Y02P

Claim:
1. A method for recycling platinum group metals from a catalytic structure, comprising the steps of: a) dissolving the platinum group metal by treating the catalytic structure in an electrolytic cell with a suitable electrolyte including a complexing agent and introducing an electric current into the electrolytic cell; and re-precipitating from said electrolyte including a complexing agent the platinum group metal by increasing the pH of the electrolyte system and adding a reducing agent; wherein the platinum group metal and the electrolyte are not separated prior to re-precipitation of platinum on the catalytic structure; wherein said current is a bias for dissolving platinum with a constant potential with intermittent pulses of lower potential for reestablishing the state of the surface of the catalytic structure; and wherein said current is not an alternating current.