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[Chemical Knowledge]：Production and manufacturing method and process of calcium oxide

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The manufacturing method
of calcium oxide
calcium oxide, also known as quicklime, is an important inorganic chemical raw material, widely used in chemical, metallurgy, building materials, medicine, food and other industries. This article will introduce the manufacturing method of calcium oxide in detail, including raw material selection, preparation process, production equipment and so on.

1. raw material selection

manufacturing calcium oxide is the main raw material of limestone, its main component is calcium carbonate. Selection of high quality limestone raw materials is the key to manufacture high quality calcium oxide. When choosing limestone raw materials, the following factors should be considered:

1. High calcium carbonate content and less impurities;
2. Appropriate particle size, easy to calcine;
3. Low moisture content, reducing calcination energy consumption.

2. preparation process
The preparation process of
calcium oxide mainly includes two steps: calcination and digestion of limestone.

1. Calcination

The limestone raw material is heated to a certain temperature to decompose it into calcium oxide and carbon dioxide. The temperature and atmosphere need to be controlled during the calcination process to ensure product quality and output. The calcination equipment usually adopts rotary kiln or vertical kiln.

2. digestion

The calcined calcium oxide is reacted with water to produce calcium hydroxide, I .e., slaked lime. In the process of digestion, it is necessary to control the amount of water and reaction temperature to ensure the quality and output of hydrated lime. Digestion equipment typically employs a digester or digester.

3. production equipment

calcium oxide production equipment mainly includes calcination equipment and digestion equipment.

1. Calcination equipment

rotary kiln is a commonly used calcination equipment, which has the advantages of simple structure, convenient operation and high production efficiency. Rotary kiln is mainly composed of kiln body, supporting device, transmission device, feeding device, combustion device and so on. In the calcination process, the limestone raw material enters from the kiln tail, and is discharged from the kiln head after high-temperature calcination, and the carbon dioxide produced at the same time is discharged from the kiln tail.

2. Digestion equipment

digester is a commonly used digestion equipment, with compact structure, simple operation, high production efficiency. The digester is mainly composed of a shell, a stirring device, a water adding device, and a discharging device. In the digestion process, calcium oxide and water are fully contacted and reacted under the action of the stirring device, and the generated calcium hydroxide is discharged from the discharge device.

4. production precautions

1. Strictly control the quality and particle size of raw materials to ensure product quality and output;
2. Control the temperature and atmosphere during calcination to avoid over-burning or under-burning of products;
3. Control the amount of water added and the reaction temperature during digestion to avoid over-thickening or over-thinning of products;
4. Keep the equipment clean and sanitary during production, regular maintenance and overhaul of equipment;
5. Strengthen production safety management to ensure the safety of employees and property.

In short, the manufacturing method of calcium oxide needs to pay attention to the selection of raw materials, preparation process, production equipment, etc., to ensure product quality and output. At the same time, it is necessary to strengthen management and maintenance in the production process to improve production efficiency and economic benefits.

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