Microstructure and Mechanistic analysis of high-calcium fused magnesia molten heap

To study the significant influence of the microstructure of high-calcium fused magnesia on MgO-based refractories products. The chemical composition, microstructure, phase composition, and densification of the high-calcium fused magnesia with the selected locations were studied. The results revealed that the high-calcium fused magnesia at the core of the furnace bottom and middle of the electrode had the highest MgO content and the content of various impurities is the least. The bond phase is dicalcium silicate (C₂S) and a low melting point silicate phase, and a certain amount of srebrodolskite appears in the upper layer of the molten heap. The longitudinal position from the top to the bottom of the grain size first becomes small and then large. In the horizontal position from the inside to the outside of the grain size firstly becomes large and then small, whose the largest grain size being 938μm. At the bottom of the furnace core of the bulk density is the largest, reaching 3.57g/cm³, the lowest porosity of 1.05%.