Cement/Cementitious Material Prepared by Roasting Argon Oxygen Decarburization Slag with Calcium Oxide

To enhance the economic value and utilization of argon oxygen decarburization (AOD) slag, cement/cementitious materials were prepared by roasting AOD slag with calcium oxide, and their compressive and bending strengths were characterized. It was clarified that a phase transition from dicalcium silicate to tricalcium silicate occurs as the calcium oxide content increases. The strength of the cement/cementitious materials (S2) met the requirements of 32.5 ordinary Portland cement (OPC), with a highest compressive strength of 63.18 MPa; and the water requirements for standard consistency, setting time, and stability were determined. Chromium leachability (at 12 days) declined to its lowest value (0.2 mg/l), which is lower than the national requirement for building materials (1.5 mg/l). Therefore, roasting AOD slag with calcium oxide is an effective and feasible method to prepare cement/cementitious materials.