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Calcium Aluminate Cement (CAC), also known as High Alumina Cement (HAC), along with Portland Cement, belongs to the category of hydraulic cements. The primary mineral composition of the former is calcium aluminate, while the latter primarily consists of calcium silicate. Due to the differences in mineral composition, the properties of the cements also differ.
In 1908, the French company Lafarge successfully produced high alumina cement using a reverberatory furnace melting method and obtained a patent, addressing the issue of corrosion resistance in marine and underground water engineering. During actual use, it was also discovered that high alumina cement has excellent early strength, and during World War I, high alumina cement was extensively used to construct fortifications. After the 1980s, the proportion of monolithic refractories in the refractory materials industry increased rapidly, and the consumption of high alumina cement as a binder also increased steadily.
OREWORLD's calcium aluminate cement is meticulously classified into two basic categories based on its unique chemical composition: Ordinary Calcium Aluminate Cement and Pure Calcium Aluminate Cement. The alumina (Al₂O₃) content of ordinary calcium aluminate cement ranges from 53% to 72%, while the lime (CaO) content fluctuates between 21% and 35%. In contrast, pure calcium aluminate cement exhibits a higher alumina purity, with its content increased to 72% to 82%, and the corresponding lime content slightly reduced to 19% to 23%.
OREWORLD calcium aluminate cement is primarily used as a binder for refractory castables and refractory gunning mixes. The main requirements for ordinary calcium aluminate cement are:
Suitable setting time to ensure sufficient working time, generally requiring an initial setting period of more than 1 hour and a final setting time of less than 8 hours, with the shorter the interval between the initial and final setting, the better;
Sufficient early strength, meaning that after one day of curing, the cement can achieve 60% to 70% of the strength specified by its grade, and after 3 days of curing, it can exceed 90%.
In addition to the above two points, pure calcium aluminate cement is also required to have a certain degree of refractoriness and good workability to meet construction and high-temperature use requirements.
Additionally, medium and low-grade refractory castables, such as clay-based, high-alumina-based castables, use ordinary calcium aluminate cement as a binder. High-grade refractory castables, such as corundum-based, mullite-based, chromium-corundum-based, corundum-spinel-based castables, use pure calcium aluminate cement as a binder. The addition amount of calcium aluminate cement in ordinary refractory castables is 10% to 20%, in low cement refractory castables it is 5% to 7%, and in ultra-low cement castables it is less than 3%.
