Calcium hydroxide inorganic compound, chemical formula Ca(OH)2, commonly known as hydrated lime or slaked lime. It is a white powdery solid with two layers of water added. The upper layer of aqueous solution is called clarified lime water and the lower layer of suspension is called lime milk or lime slurry. The limewater clarified by the supernatant can be used to test carbon dioxide, while the lime milk in the substratum is a kind of building material. Calcium hydroxide is a kind of strong alkali, with sterilization and anti-corrosion ability, and has a corrosive effect on skin and fabric [1]. Calcium hydroxide is widely used in industry. It is a common building material, but also used as a fungicide and chemical raw materials