Today in its 8th edition, the “Slag Valorisation Symposium”, organised by the Materials Engineering Department at KU Leuven and held in Belgium since 2009 as a biennial conference, serves as a forum for discussions on the valorisation of slags and other high-temperature metallurgical residues. The symposium has historically brought together different expertise from academia and industry, providing a knowledge platform to share and discuss the upcoming challenges and opportunities in the world of slag valorisation and sustainable high-temperature processes.