The main component of lime is calcium oxide.

The main component of lime is calcium oxide, followed by magnesium oxide. Lime is made from products with high calcium carbonate content such as limestone, dolomite, chalk, and shells, which are calcined at 900 to 1100°C. Quicklime can become hydrated lime after absorbing moisture or adding water, so that it can be prepared into lime slurry, lime paste, lime mortar, etc.

The original lime production process is to lay limestone and fuel (wood) in layers, then ignite fire and calcine for a week. Modern production uses equipment such as mechanized and semi-mechanized vertical kilns, rotary kilns, and boiling furnaces. The calcination time is also shortened accordingly. It only takes 2 to 4 hours to produce lime with a rotary kiln, which can increase production efficiency by more than 5 times compared with vertical kiln production.

Uses of lime

1. Pond cleaning and disinfection

Lime can kill pathogenic microorganisms and harmful organisms in the pond during the heat generation process. It can also improve soil pH, total alkalinity, total hardness and other effects, and has the effect of oxidizing and saponifying soil organic matter.

2. Painting walls

Lime is a common indoor and outdoor decoration paint. First use mature and aged lime paste, add an appropriate amount of water to dilute it into lime milk, and then use To paint the walls. However, special attention should be paid during use. Lime will undergo a chemical reaction when it meets water, causing the temperature to rise rapidly, so special attention should be paid.

3. Use as raw material

Lime can be used as raw material. For example, lime is needed to make calcium carbide, soda ash, or bleaching powder. Can still be used for tanning. Nowadays, water pollution is serious, and lime is indispensable, which plays an important role in wastewater purification.