the mechanism of dolomite decomposition under CO2 is responsible for enhancing the kinetics of calcination and reactivity of dolomitic CaO 21, 32. Thus, dolomite decomposes directly into MgO and CaO at a temperature about 700 C regardless of the CO2 partial pressure in the calcination reaction reduces the utilization ratio of dolomite 18-21. However, dolomite can decompose to lime and periclase at high calcining temperature. Xu et al. 22 used dolomite to produce an expansive agent based on periclase, and the silica-bearing mineral was combined with the lime released from dolomite to form dicalcium silicate.