Effect of rich-MgO from low-calcium limestone on the calcination and properties of C4A3$-C2S clinker

Abstract

As one type of low-calcium cement, C4A3$-C2S clinker consumes less energy and can utilize rich-MgO low-calcium limestone. The effect of rich-MgO low-calcium limestone on its calcination and properties is studied by means of f-CaO, XRD Rietveld refinement, TG-DTG and Lithofacies analysis. The results show that 3 % ∼ 5 % MgO can promote the absorption of f-CaO and accelerate the formation of highly active monoclinic C3S and C4AF in clinker. When the MgO content is 7.0% and 8%, C4A3$-C2S clinker calcined at 1380°C has excellent mechanical properties and its soundness is still qualified. This research shows that the rich-MgO low-calcium limestone can replace more than 50 % of natural limestone to prepare C4A3$-C2S clinker in cement industrial production.