FUNDAMENTAL ROTATING-DISK STUDY OF PLATINUM RECOVERY FROM AQUEOUS-SOLUTION BY A REDUCTION COLLECTION TECHNIQUE/

A reduction/collection procedure for the recovery of platinum from aqu eous solutions applying metallic iron (in the form of a rotating disk) as reductant and lead or copper ions as reduced platinum collectors w as studied. Fundamental kinetic aspects of the process, such as the in fluence of the pH and of the collector's concentration on platinum rec overy yield, were examined experimentally. The two collectors were com pared with respect to the particle size of the precipitant falling fro m the disk surface. Lead ions seem to give a coarser precipitant compa red to copper and increase the pH region at which the reaction takes p lace. The final product was a mixture of platinum and platinum/lead bi metallic compounds (mainly PbPt).