|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Rare Metal Extraction & Processing
||Extraction of platinum group metals from spent catalyst material by a novel pyro-metallurgical process
||Ana Maria Martinez, Kai Tang, Camilla Sommerseth, Karen Sende Osen
|On-Site Speaker (Planned)
||Ana Maria Martinez
The extraction of platinum group metals (PGM) contained in waste automobile catalyst monolithic honeycomb was investigated by a novel approach that combines a pyro-metallurgical and electrolysis step. The first step aims to both up-concentrate the amount of PGMs by using a metal collector, as well as to prepare the conductive material to be used as anode in the electrolysis step. The electrolysis step is carried out in a molten chloride electrolyte, where the PGMs remains as metallic residue, and the refined metal is further reused in the pyro-metallurgical step.
Optimisation of the pyro-metallurgical process led to 82-106% metal recovery rates, while the PGM recovery rates were close to 100%. Furthermore, the electrolyte composition and working temperature, as well as cell design of the subsequent electrolytic method were adjusted. The process was assessed in a lab-scale electrolysis reactor, where PGMs could be extracted selectively with a current efficiency of ca. 70%.
||Recycling and Secondary Recovery, Pyrometallurgy, Electrometallurgy