The thermogravimetric curve TG/DTG obtained for industrial calcium carbonate (Figure 1a) showed a thermal stability up to 600 °C with a small mass loss (Dm = 1.8%) corresponding to volatile material. The decomposition process occurs in a single step in a defined way, between temperature range from 601 to 770 °C, with a Dm = 41.7% due to carbon dioxide release, given rise to calcium oxide: CaCO3 (s) ¬ heat ® CO2 (g) + CaO(s). The calcium carbonate usually decomposes at temperatures over 600 °C without fusion process