2nd International Slag Valorisation Symposium | Leuven | 18-20/04/2011 313 Additions of industrial residues for hot stage engineering of stainless steel slags

The disintegration of stainless steel slags, due to the beta to gamma dicalcium silicate transformation, hinders the valorisation and increases the landfilling cost considerably. In this work, two industrial wastes, namely boron residues from the dressing of boron minerals and fly ash from lignite’s combustion, have been used as additives in order to produce physically stable stainless steel slags. Results indicate that 1 wt % of boron residue is sufficient, however, 22 wt % of fly ash is required for a synthetic slag of basicity (CaO/SiO2) = 2. The practical implications in terms of valorisation of the produced slags are also discussed