What's the difference between quicklime and hydrated lime? What's the use? What is its composition?

Lime can be divided into quicklime and hydrated lime. The main component of quicklime is calcium oxide (CaO), and white solid is refractory. Limestone with high CaO content is calcined to above 900℃ in ventilated lime kiln. It is water-absorbent and can be used as a desiccant. People in China often use it to prevent the resurgence of sundries. React with water (release a lot of heat at the same time), or absorb moisture in humid air, that is, mature lime [calcium hydroxide Ca(OH)2], also known as "hydrated lime". Slaked lime is dissolved in one liter of water1.56g (20℃). Its drink and solution are called "lime water", which is alkaline and absorbs carbon dioxide in the air to form calcium carbonate precipitation. Chemical formula of quicklime: chemical formula of CaO Cao hydrated lime: Ca(OH)2 calcium hydroxide CaO+H2O==Ca(OH)2 When water is added, the reaction will release a lot of heat. Although both of them contain calcium, their chemical properties are different. According to this chemical reaction, it can be remembered that quicklime becomes hydrated lime after adding water.