INCORPORATION OF SULFUR IN AN OPTIMIZED LADLE STEELMAKING SLAG

CaO-Al2O3-SiO2 = 50-42-8 wt% eutectic slags, similar in composition to a secondary steelmaking slag, containing different amounts of CaS, we re heated between 1 673-1 873 K. DTA was performed. Samples were chara cterized by EMP and XRD. Four main phases were present: CaO . Al2O3, 2 CaO . Al2O3 . SiO2, 2CaO . SiO2 and 23CaO . 14Al(2)O(3) . CaS or 22CaO . 14Al(2)O(3) . 2CaS products of the reaction of CaS with 12CaO . 7Al (2)O(3) al 1349(+/-21) K. The sulfur phases crystallized first and the rest of the melt followed the well known CaO-Al2O3-SiO2 phase diagram . For comparison, typical ironmaking and steelmaking slags (CaO-Al2O3- SiO2 = 48-12-40 wt%) were also utilized to study the incorporation of sulfur in their structure. The resulting phases were all glasses with some non-stoichiometry.