Limestone is subjected to high temperatures in industrial ovens in a process known as calcination, that originates CaO (calcium oxide) and CO2 (carbon dioxide):


For this reaction to occur, the oven temperature should be at least 850ºC, through the burning of a fuel that can be: timber, fuel oil, natural gas, charcoal…

To obtain calcium hydroxide it is necessary to promote the reaction of quicklime with H2O, with the subsequent release of heat:

CaO+H2O = Ca (OH)2 + 63.7 kJ/mol of CaO

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