Brief Introduction
Calcium aluminate cement is a cement with calcium monoaluminate or calcium dialuminate as the main mineral component. It is made of natural bauxite or industrial alumina and calcium carbonate (limestone) in a certain proportion, and is made by calcining or electric melting, and it is also made by melting bauxite and limestone. Calcium Aluminate Cement can be classified into two types of common calcium aluminate cement (Al2O3 53～72%，CaO 21～35%) and pure calcium aluminate cement (Al2O3 72～82%，CaO 19～23%) according to its chemical component . Common calcium aluminate cement also can be classified into two types of low iron content (Fe2O3<2%) and high iron content (Fe2O37～16%). Low iron type also can be classified into bauxite cement (Al2O3 53～56%，CaO 33～35%), Aluminum-60 cement (Al2O3 59%～61%，CaO 27～31%) and aluminate cement (Al2O3 65～70%，CaO 21～24%). Pure calcium aluminate cement can be classified into common type (Al2O3 72～78%) and ultrahigh aluminum type (Al2O3 78～85%). 
Technical Datas
| Calcium Aluminate Cement | ||||||
| CA-65 | CA-68 | CA-70 | CA-75 | CA-80 | ||
| Chemical Composition (%) | Al2O3 | 64-66 | 67-69 | 69-71 | 73-75 | 77-80 |
| CaO | 32-34 | 29-31 | 27-29 | 23-25 | 18-20 | |
| SiO2 | 1.8 | 1.2 | 0.3 | 0.3 | 0.3 | |
| Fe2O3 | 0.6 | 0.6 | 0.3 | 0.3 | 0.3 | |
| Specific Surface (cm2/g) | 4500 | 4500 | 5000 | 5500 | 7000 | |
| Setting time (h:min) | Initial setting (min) | 0:40 | 0:40 | 0:40 | 0:45 | 0:45 |
| Final Setting (min) | 8:00 | 8:00 | 10:00 | 10:00 | 10:00 | |
| Cold Modulus of Rupture (MPa) | 24 hour | 6.0min | 6.0min | 6.0min | 6.0min | 5.0min |
| 72 hour | 8.0min | 8.0min | 8.0min | 8.0min | 6.0min | |
| Cold Crushing Strength (Mpa) | 24hour | 45.0min | 45.0min | 45.0min | 45.0min | 35.0min |
| 72hour | 70.0min | 70.0min | 70.0min | 70.0min | 60.0min | |
| Refractoriness (°C) | 1680 | 1710 | 1730 | 1750 | 1770 | |
Features
1.High temperature resistance,
2.High early strength,
3.Rapid and complete wet hydration,
4.Stable physical performances,
5.Low water requirement,
6.Excellent biological acid erosion,
7.Acts as a bonding material in refractory castables,
8.Large hydration heat,
Application
Calcium Aluminate Cement is mainly used as a binder for refractory castables and refractory spray materials:
Medium and low-grade refractory castables, such as clay and high-alumina castables, use ordinary calcium aluminate cement as the binder. High-grade refractory castables, such as corundum, mullite, chromium-containing corundum, corundum-spinel and other castables use pure calcium aluminate cement as the binder. The addition of calcium aluminate cement in ordinary refractory castables is 10%~20%, the addition of low cement refractory castables is 5%~7%, and the addition of ultra-low cement castables is less than 3%.
Among unshaped refractory materials, castables with calcium aluminate cement as binder are widely used.
