Effect of Cooling Method on the Mineralogy and Stability of Steel Slag

Steel slag, as a potentially active gelling material, has not been widely used in the field of building materials. The effective utilization steel slag depends on its stability, which is related to cooling process with phases changing. relation between method and stability were carried out present study. slags first melted into liquid state at 1873 K then cooled using four methods, namely, as-furnace cooling, air mist water quenching. characterized by XRD, SEM, chemical analysis. results show that under methods mainly contained Ca2SiO4 (C2S), Ca2SiO4–Ca3P2O8 solid solution (C2SP), Ca3SiO5 (C3S), monoxide (RO), Ca2Fe2O5 (C2F), f-CaO. content increased increase rate. Rapid could reduce RO phase for furnace quenching samples 28.03%, 22.53%, 14.17%, 13.30%, respectively. In addition, rapid effectively f-CaO improve slag.