Patent ID: 6475448
Filing Date: 2002-11-05
Classification: C01G,C22B,Y02P

Abstract:
Method for the separation of ruthenium from noble metal solutions containing ruthenium and H+ and Clâˆ’ ions, wherein in a first step the ruthenium-containing noble metal solution having an H+ concentration and Cl31  concentration of greater than 1 mol/l is heated to 50 to 65Â° C., then in a second step chlorate is added to the heated noble metal solution to form a suspension/solution, the suspension/solution is heated to 80 to 90Â° C., a carrier gas is passed through the heated suspension/solution to capture ruthenium tetroxide, and, in a third step, bromate is added to the heated suspension/solution at a pH of 1 to 3 and a temperature of 60 to 95Â° C., and a carrier gas is passed through the bromated suspension/solution to capture additional ruthenium tetroxide.