Study on the Cementitious Properties of Aluminate Cement Clinker Prepared from Melt Reduction Slag of Quenched and Tempered High-Iron Red Mud

Abstract

Red mud is another worldwide problem after the bulk solid waste of steel slag.The reaction time between phases of aluminate cement clinker in the molten state is approximately 20 min, and the phase composition obtained is CA. After quenching, a large area of the glass phase appeared in the SEM images of the aluminate cement clinker. The compressive strength and flexural strength at 28 days reached 77.7 and 7.6 MPa, respectively, and the hydration strengths at 1, 3, and 28 days were higher than the strength standard of CA50II aluminate cement.Reconstruction of iron extraction tailings from red mud melting reduction is an effective technology to solve the problems of low cementitious activity, complex composition and large chemical fluctuation of red mud, and it has become an effective technology to improve the comprehensive utilization rate of red mud and promote energy savings and emission reduction.