Effect of Slag Viscocity on the Separation of PGM's during Electric Scrap Melting

초록

A recovery of precious metals from spent printed circuit board(PCB) scrap has been investigated by using pyrometallurgical process. For this purpose vertical electrical resistance furnace and high frequency induction furnace were used for calcination and melting the scrap, respectively. In order to enhance the separation of precious metals from the scrap, various slag systems were attempted to be used in the process and copper was used for collector metal to collect precious metals from the scrap. Main variables used in the experiments were the slag properties such as composition and temperature of the slags. High temperature viscometer was used to measure the viscosity of slag system. It was found that viscosity of slag greatly influences on the eparation of precious metals from melted scrap