Lime is divided into quick lime and hydrated lime. The main component of lime is calcium oxide (CaO), white solid refractory. Limestone with high (CaO) content is obtained by forging in a ventilated lime kiln to more than 900 ° C. It is absorbent and can be used as a desiccant, which is commonly used by Chinese people to prevent sundries from returning to moisture. React with water (while releasing a lot of heat), or absorb moisture in the humid air, that is, mature lime [calcium hydroxide Ca (OH) 2], also known as "slaked lime". Hydrated lime dissolves 1.56 grams (20 ° C) in one liter of water, and its drink and solution are called "lime water", which is alkaline and absorbs carbon dioxide in the air to form calcium carbonate precipitates.

Hydrated lime is actually calcium hydroxide which is a white powdery solid. The chemical formula Ca (OH) 2 is almost identical in appearance to the white powder! Commonly known as hydrated lime, slaked lime, the aqueous solution is called clarified lime water. It can be used in decoration. However, slaked lime: calcium hydroxide is also a white powdery solid. Chemical formula Ca (OH) 2, commonly known as hydrated lime, slaked lime, after adding water, the upper and lower layers, the upper aqueous solution is called clarified lime water this difference! Can make a strong alkali!

Hydrated lime slaked lime is the same, in fact, it is calcium hydroxide, its basic use is used for making bleaching powder, hard water softener, improving soil acidity, tap water disinfection clarifying agent and construction industry. Color: white powdery solid, solubility: slightly soluble in water, release a lot of heat, corrosive: weak, acid-alkaline: alkaline, calcium hydroxide toxicity protection dust or suspended droplets have a stimulating effect on mucous membranes, can cause sneezing and coughing, and alkali can saponify fat, absorb water from the skin, dissolve protein, stimulate and corrode tissue. Inhalation of lime dust may cause pneumonia.