calcium oxide (CaO), or commonly referred to as quicklime, is a high calcium content derivative of our 98.5% pure calcium carbonate (limestone). Calcium oxide is produced by heating calcium carbonate to 2000 degrees F where carbon dioxide disassociates as a gas from the calcium carbonate: {CaCO3} + Heat = {CaO} + {CO2} Calcium oxide can be utilized in a variety of applications because of its physical and chemical qualities. Arij Global Trading quicklime is used in flue gas desulfurization, water and waste water treatment, steel, paper, chemical and environmental applications.