Back to results
US 6,475,448 B2Granted
Method for the separation of ruthenium from noble metal solutions
AssigneeW.C. Heraeus GmbH
InventorsMatthias Grehl, Horst Meyer, Dieter Schäfer
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeW.C. Heraeus GmbH
InventorsMatthias Grehl, Horst Meyer, Dieter Schäfer
Estimating the term…
Ruthenium is separated from noble metal solutions, by: a) heating a noble metal solution containing ruthenium to a temperature of T=+50° C. to T=+65° C., the H+ concentration and Cl− concentration are greater than 1 mol/l each; b) addition of chlorate, the resulting suspension/solution having a temperature of T=+50° C. to T=+65° C., heating the suspension solution to T=+80° C. to T=+90° C. and passing a carrier gas through the suspension/solution and capturing the resultant ruthenium tetroxide; c) addition of bromate at a pH of 1 to 3, the resultant suspension/solution having a temperature T=+60° C. to T=+95° C., and passing a carrier gas through the suspension solution and capturing the resultant ruthenium tetroxide.
Method for the separation of ruthenium from noble metal solutions containing ruthenium and H+ and Cl− 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 65° 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 90° 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 95° C., and a carrier gas is passed through the bromated suspension/solution to capture additional ruthenium tetroxide.
Method according to 1 wherein in the second step an equimolecular amount of chlorate is added to the solution.
Dependencies are inferred from the claim text.