| Calcium oxide (CaO formula, other common names are quicklime, calcined lime) is an oxide of calcium, which is widely used. It has a molar ratio of 56.1 g / mol, a thermal expansion coefficient of 0.148 (units?), A melting point of 2572 ¡Æ C.
It is a white crystalline solid and is caustic and alkaline. As a commercial product, quicklime contains both magnesium oxide (MgO), SiO2 silicon oxide and small amounts of Al2O3 aluminum oxide and iron oxides.
Conventional calcium oxide is produced by thermal decomposition (heating) of natural materials such as limestone, which is calcium carbonate (CaCO3). It takes place when this material is heated to a temperature of about 900 ¡Æ C (AmericanScientist), a process known as lime, to remove carbon dioxide in an irreversible chemical reaction. Lower temperatures can create a reversible reaction, which allows material that is calcined into quick lime to re-absorb the surrounding carbon dioxide to become limestone. This is one of the reactions m.. |
