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