“…In a study on carbonation of pure minerals typically present in steelmaking slag (Bodor et al, 2013), bredigite (Ca 7 Mg(SiO 4 ) 4 ) was the most reactive phase during carbonation, followed e depending on the process conditions e by dicalcium silicate polimorphs (b-and g-Ca 2 SiO 4 ) and cuspidine (Ca 4 Si 2 O 7 F 2 ), or by srebrodolskite (Ca 2 Fe 2 O 5 ) and calcium monoferrite (CaFe 2 O 4 ); however, other investigators (Berryman et al, 2014) reported some low reactivity of srebrodolskite upon carbonation. In real industrial residues the ranking of affinity towards CO 2 observed for pure mineral phases may be altered by a number of factors (Santos et al, 2013b), including differences in sizes of the individual particles, presence of impurities and degree of ion substitutions in crystals (Fern andez Bertos et al, 2004;Mo and Panesar, 2012), as well as accessibility of reactive components within the solid (Bodor et al, 2013). Mineralogical studies on various carbonated steel slags reveal that the reactive minerals include dicalcium silicate, periclase (MgO), akermanite (Ca 2 MgSi 2 O 7 ), merwinite (Ca 3 Mg(SiO 4 ) 2 ), cuspidine as well as a number of CaeAl oxides and CaeMgeAl-silicates (Baciocchi et al, 2015;Chang et al, 2013a;Johnson et al, 2003;Salman et al, 2014;Uibu et al, 2011).…”