An application of infrared analysis to determine the mineralogical phases formation in fluxes for thin slab casting of steel

► Commercial fluxes are constituted by minerals. ► Cuspidine (3CaO·2SiO2·CaF2) phase is obtained when flux are heated. ► The cuspidine spectrum was obtained with FTIR and XRD techniques. ► The FTIR is proposed as a complementary technique to study the fluxes structure.