1. The main component of quicklime

is calcium oxide. Usually, the natural rock with the main component of calcium carbonate is calcined at high temperature, which can be decomposed into carbon dioxide and calcium oxide (chemical formula: CaO, namely quicklime, also known as marble).

All natural rocks with calcium carbonate as the main component, such as limestone, chalk and dolomitic limestone, can be used to produce lime.

2. slaked lime or slaked lime

is calcium hydroxide, an inorganic compound with the chemical formula of Ca(OH)2.

is a white powdery solid. After adding water, it has two layers, the upper aqueous solution is called clarified lime water, and the lower suspension is called lime milk or lime slurry. The clear limewater in the upper layer can test carbon dioxide, and the turbid liquid limewater in the lower layer is a building material.

calcium hydroxide is a binary medium-strong alkali (calcium hydroxide is considered as a strong alkali in middle school, but in fact it can't be completely ionized in water, so it is considered as a medium-strong alkali in college textbooks), which has the universality of alkali and has corrosive effects on skin and fabrics.

calcium hydroxide is widely used in industry. It is a common building material, and also used as bactericide and chemical raw material.