Simulus Laboratories undertook integrated piloting of a complex hydrometallurgical flowsheet to produce copper cathode, nickel/cobalt sulphide and a final PGM product from platinum concentrate. The program included a wide range of unit operations including pressure oxidation in an autoclave, reducing gas heat treatment in kilns up to 900C and a PGM leach in chlorine gas and hydrochloric acid.  Hydrochloric acid recovery was also tested with greater than 99% recovery being achieved.