The paper with the title  “Coproduction Development of Mineral Wool and Low Nickel-FeNi by feeding of ALUFLUX”  by Th. Tzevelekou, A. Flampouri, K. Pantazis, P. Lampropoulou, D. Papoulis, B. Tsikouras,  S. Papaefthymiou, E. Metaxa was presented in the 5^th  International Slag Valorisation Symposium, Leuven, Belgium. The Symposium provided a rich overview of the contemporary trends in the worldwide research and innovation strategies as regards the Valorisation of ferrous and non-ferrous slag, fly ash, bottom ash and numerous other high-temperature (metallurgical) residues. Τhe presented paper demonstrated that the use of ALUFLUX – a by-product of secondary aluminum industry, –  in the conventional production process of mineral wool in EAF, as a partial substitute of bauxite, results in the co-production of lighter colored mineral wool with high level of technological properties and a low Ni-FeNi metal, allowing the realization of circular economy concept.