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 other aspects.
I. Raw material selection
The main raw material for manufacturing calcium oxide is limestone, whose main component is calcium carbonate. Selection of high-quality limestone raw materials is the key to manufacturing high-quality calcium oxide. In the selection of limestone raw materials, the following factors should be considered:
1. high calcium carbonate content, less impurities;
2. appropriate particle size, easy to calcine;
3. low moisture content, reducing the energy consumption of calcination.
II. Preparation process
The preparation process of calcium oxide mainly includes two steps of limestone calcination and digestion.
1. Calcination
Heat the limestone raw material to a certain temperature to decompose it into calcium oxide and carbon dioxide. The calcination process needs to control the temperature and atmosphere to ensure product quality and yield. Calcination equipment usually adopts rotary kiln or vertical kiln. Digestion
The calcium oxide obtained from calcination reacts with water to produce calcium hydroxide, i.e. slaked lime. The digestion process needs to control the amount of water and reaction temperature to ensure the quality and yield of slaked lime. Digestion equipment usually adopts digester or digestion pool.
Three, production equipment
Calcium oxide production equipment mainly includes calcining equipment and digestion equipment.
1. Calcination equipment
The rotary kiln is commonly used calcination equipment, with simple structure, convenient operation, high production efficiency. The rotary kiln is mainly composed of kiln body, supporting device, transmission device, feeding device, combustion device and so on. In the process of calcination, limestone raw material enters from the end of kiln, and after high temperature calcination, it is discharged from the kiln head, meanwhile, the carbon dioxide produced is discharged from the end of kiln.
2. Digestion equipment
Digester is commonly used digestion equipment, which has the advantages of compact structure, easy operation and high production efficiency. The digester is mainly composed of shell, stirring device, water filling device, discharging device and so on. In the process of digestion, calcium oxide and water are fully contacted and reacted under the action of stirring device, and the generated calcium hydroxide is discharged from the discharging device.
Four, production notes
1. Strictly control the quality of raw materials and particle size, to ensure product quality and yield;
2. Calcination process to control the temperature and atmosphere, to avoid the product over-burning or under-burning;
3. Digestion process to control the amount of water and reaction temperature, to avoid the product over-thickening or over-thinning;
4. The production process to maintain equipment cleanliness and hygiene, and regular maintenance and overhaul of equipment;
5. Strengthen the production safety management, to ensure personal safety of employees;
5. Production safety management, to ensure the personal safety of employees and property safety.
In short, the manufacturing method of calcium oxide needs to focus on raw material selection, preparation process, production equipment and other aspects to ensure product quality and yield. At the same time, management and maintenance need to be strengthened in the production process to improve production efficiency and economic benefits.
