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Alumina Cement

Aluminate Cements / Refractory Cement

Calcium aluminate cements are cements consisting predominantly of hydraulic calcium aluminates. Alternative names are "High Alumina Refractory Binder 'Or "High-alumina cement" They are used in a number of small-scale, specialized applications.

The method of making cement Require Calcium Carbonate and low-silica bauxite and for Higher Refractoriness High Purity Alumina is used. Chirag Fuels Follows Advance technology of Calcination From Procuring high quality raw materail to Finish product.

The main active constituent of calcium aluminate cements is monocalcium aluminate (CaAl2O4, CaO · Al2O3, or CA in the cement chemist notation). It usually contains other calcium aluminates as well as a number of less reactive phases deriving from impurities in the raw materials. Rather a wide range of compositions is encountered, depending on the application and the purity of aluminium source used.

Major Applications : -

Because of their relatively high cost, calcium aluminate cements are used in a number of restricted applications where performance achieved justifies costs:

  • In construction concretes, where rapid strength development is required, even at low temperatures.
  • As a protective liner against microbial corrosion such as in sewer infrastructure.
  • In refractory concretes, where strength is required at high temperatures.
  • As a component in blended cement formulations, for various properties such as ultra-rapid strength development and controlled expansion are required.
  • In sewer networks for their high resistance to biogenic sulfide corrosion.

Technical Specifications : -

Oxide/Mineral General Purpose Buff White Refractory
SiO2 4.0 5.0 2.7 0.4
Al2O3 39.4 53.0 62.4 79.6
Fe2O3 16.4 2.0 0.4 0
CaO 38.4 38.0 34.0 19.8
MgO 1.0 0.1 0.1 0
Na2O 0.1 0.1 0 0
K2O 0.2 0 0 0
TiO2 1.9 1.8 0.4 0.1
Monocalcium aluminate 46 70 70 35
Dodecacalcium hepta-aluminate 10 5 0 0
Monocalcium dialuminate 0 0 17 30
Belite 7 5 0 0
Gehlenite 4 14 11 1
Ferrite 24 5 2 0
Pleocroite 1 1 1 0
Wüstite 7 0 0 0
Corundum 0 0 0 33

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