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How is limestone used to make cement?

Date:2019-06-13 16:35 Source:未知Views:

Limestone is one of the two key components needed to make cement in cement factories.

The other is clay.

Cement powder, limestone, and clay are ground into powder by an vertical mill, mixed together in proper proportions, and fed into a rotary kiln, where the raw material is heated to about 2,700 degrees Fahrenheit.

Although limestone and clay are the main components of cement, very small amounts of aluminum, iron, or gypsum are usually required.

Limestone is used because it contains a lot of calcium oxide, the main ingredient in cement, which usually accounts for about 65% of the final product.

The amount of clay used depends on its silica content, which accounts for about 20% of the cement powder.

The cement powder produced by heating the material is combined with water to eventually harden.

This powdery cement is usually mixed with other materials to form concrete, mortar and other building materials.

Concrete is formed by mixing sand, rock and gravel, which combine in cement to produce a harder product, just like stone.

Mortar is made by mixing cement powder with water, sand and lime.

It is mainly used to form bonds between bricks or tiles.


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