Refining of platinum-group metals

CIM Bulletin, Vol. 82, No. 923, 1989

G.P. Demopoulos, Department of Mining and Metallurgical Engineering, McGill University

The recovery and separation of platinum-group metals (PGM) from primary and secondary materials currently attracts a lot of interest due to the high value of the metals and their increasing demand for high-tech applications. Thus, the traditional refining processes are gradually replaced by newer more efficient separation techniques such as solvent extraction and ion exchange. In this paper the classical and modern refining techniques are reviewed and the pertinent solution chemistry dictating proper processing strategies in each case is discussed. The technological advantages of the modern separation methods are emphasized and reference to the recovery of PGM from primary as well as secondary materials is given.

Keywords: Hydrometallurgy, Platinum-group metals, Refining Processes, Separation techniques, Solvent extraction