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Refractory Cement

Refractory cement is a general term used for calcium aluminate cements. “High alumina cement” is also an alternative name for the refractory cement. It is used for specialized applications, such as refractory concretes and as a component in blended cement formulations. Refractory cements are the most important type of non-Portland cements, and they are about five times more expensive than the regular cement. The manufacturing process starts as the ordinary cement and limestone is still the main ingredient. However, an aluminum bearing material is added to the formula, such as bauxite and/or refined alumina. Silicon and iron are also used in the composition.

Calcium Aluminate Cements

The mixture is melted in a reverberatory furnace and left for cooling in a special bath. The purity of the aluminum source used defines the strength of the refractory cement. Monocalcium aluminate, Dodecacalcium hepta-aluminate, Belite, Gehlenite, and Ferrite are some of the examples of the aluminum source. The source defines not only the refractory strength of the product, but its color too. For example, refractory cement with an addition of Al2O3 is pure white. However, Belite added refractory cement looks as a darker shade of gray.

Refractory Cements and Their Uses

Because of the wide range of practical uses, the formula of refractory cement differs almost every time. But as we mentioned above, the refractory industry is the biggest consumer of the refractory cement. Refractory cement is also used in sewer networks, construction concretes, and as a protective liner against microbial corrosions. Foundry floors, flushing gates, and fire training buildings make use of refractory cement too. It is highly resistant against high temperatures / temperature changes, and can easily withstand up to 3.300 F. Petrochemical and nonferrous metals industries also use refractory cement. It hardens rapidly, can resist impact, abrasion, and acids. 

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