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[Chemical Knowledge]：Properties and Uses of Calcium Oxide

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Calcium oxide is an important inorganic chemical raw material, which is widely used in the field of chemical production. It has a variety of properties and uses, and plays an important role in the development of the chemical industry.

1. the properties of calcium oxide

1. physical properties

calcium oxide is a white or slightly gray powder, odorless, tasteless. It does not dissolve in water, but dissolves in acids. Calcium oxide has a density of about 3.32g/cm³, a melting point of 2572°C and a boiling point of 2850°C.

2. chemical properties

calcium oxide with strong alkaline, can react with acid to generate salt and water. At the same time, it can also react with carbon dioxide to form calcium carbonate. Calcium oxide placed in the air will gradually absorb moisture and carbon dioxide, generating calcium hydroxide and calcium carbonate.

2. calcium oxide use

1. desiccant

calcium oxide has strong water absorption, commonly used as a desiccant. In chemical production, calcium oxide is often used to dry gas, liquid and solid materials.

2. Desulfurizer

In flue gas desulfurization, calcium oxide absorbs sulfur dioxide to produce calcium sulfite, and then reacts with oxygen and limestone to produce calcium sulfate, so as to achieve the purpose of desulfurization.

3. decarbonization agent

calcium oxide can be used to remove carbon dioxide from flue gas. At high temperatures, calcium oxide reacts with carbon dioxide to form calcium carbonate, releasing heat.

4. building materials

of calcium oxide can be used as building materials, and water reaction of calcium hydroxide, the latter and carbon dioxide reaction of calcium carbonate, the formation of hard concrete.

5. Food additive

In the food industry, calcium oxide can be used as a food additive to regulate the acidity and water activity of food and to improve the preservation of food.

In short, calcium oxide has a wide range of uses in the field of chemical production raw materials, and plays an important role in promoting the development of the chemical industry.

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