Lime, whose chemical formula is CaO, is a white solid that reacts with water to form calcium hydroxide and gives off a lot of heat.The common name for calcium hydroxide is slaked lime or quicklime, CaO + H2O ═ Ca(OH)2, slaked lime or quicklime.

Lime is an air-hardened inorganic cementitious material with calcium oxide as the main ingredient. Lime is made from limestone, dolomite, chalk, shells, and other products with high calcium carbonate content, calcined at 900 to 1100 degrees Celsius.

Cooking and hardening

The process by which quicklime (CaO) reacts with water to form calcium hydroxide is known as the cooking or digestion of lime. The product of the reaction, calcium hydroxide, is called slaked lime or quicklime.

Lime ripening releases a lot of heat, the volume increases 1.5--2 times. Calcined good, high calcium oxide content of the lime ripening faster, the amount of heat and volume increase is also more. Site of lime ripening commonly used two methods: slaked lime slurry method and slaked lime powder method.

Depending on the amount of water added, lime can be cooked into slaked lime powder or lime paste. Theoretical water requirement for lime ripening is 32% of the weight of lime. In quicklime, uniformly add 60% to 80% of water, you can get fine particles, evenly dispersed lime powder. If cooked with excess water, lime paste with a certain consistency will be obtained.

Lime generally contains overcooked lime, overcooked lime is slow to mature, if the lime paste hardened after the maturation, will be due to the expansion produced by the maturation caused by bulging and cracking. In order to eliminate the hazards of overcooked lime, lime in the cooked, should also be "Chen Fu" about 2 weeks.