Dr. Stefan Steinlechner

Abstract:

The pyrometallurgical production of nonferrous metals such as copper and nickel heavily depends on magnesia-chrome refractory linings. Over the course of their service life, these refractories become infiltrated by molten phases containing not only copper or nickel but also associated metals such as cobalt, lead, tin, and zinc. Depending on the process step from which the refractory material originates, they can also be infiltrated by oxide melts (slag) or sulphide melts (matte). Currently, most spent refractories are disposed of in landfills. However, in the context of resource efficiency and sustainability, there is increasing interest in exploring these waste materials as potential secondary resources. This study investigates spent magnesia-chrome refractories focusing on the recovery potential of the infiltrated metals as well as the refractory material itself. Through detailed characterization and laboratory-scale experiments, the research outlines potential separation and recovery strategies, highlighting both opportunities and challenges associated with their practical implementation.