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This article introduces the production methods and applications of calcium aluminate cement,calcium aluminate cement is a cement with special properties, which has wide applications in construction, petrochemical, metallurgical, and other fields. However, attention should be paid to issues such as quality and applicable ranges when using.
Calcium aluminate cement is a cement with monocalcium aluminate (CaO·Al2O3) or dicalcium aluminate (CaO·2Al2O3) as the main mineral components. It is made by mixing natural bauxite or industrial alumina with calcium carbonate (limestone) in a certain proportion, and then calcining or fusing, and it can also be made by mixing iron bauxite with limestone and then fusing.
Calcium aluminate cement production mainly includes the following steps: raw material grinding, raw material mixing, forming, calcining, powder grinding, and quality inspection. The raw materials mainly consist of clinker, gypsum, aluminum powder, and other auxiliary materials, which are ground and then mixed with water to form a paste, then shaped, calcined at high temperatures, and finally ground into powder and quality inspected.
Construction Field
Calcium aluminate cement is widely used in the construction field for manufacturing lightweight partition walls, floors, roofs, etc. Due to its high strength, high-temperature stability, and chemical resistance, it can enhance the durability and safety of buildings.
Petrochemical Field
Calcium aluminate cement is used in the petrochemical field as a sealant and cementing material to enhance the stability of well walls and drilling efficiency.
Metallurgical Field
Calcium aluminate cement is used in the metallurgical field as a high-temperature cementing material, to produce high-temperature furnace materials, and due to its chemical resistance, it can be used in non-ferrous metal smelting.
The setting and hardening speed of calcium aluminate cement is also related to the curing temperature. CA2 minerals harden faster with increasing curing temperature, while CA minerals behave somewhat abnormally, setting faster around 20°C, slowing down at 30°C, and speeding up again above 30°C. It is crucial to choose appropriate curing conditions based on the phase transformation of calcium aluminate hydrates during heating because the types of hydrates formed from calcium aluminate cement can vary with different curing conditions.
In practical use, various grades of calcium aluminate cement are often seen. The grade refers to the strength achieved by the cement after a certain period of curing. For calcium aluminate cement with CA as the main mineral, the grade is generally based on the strength achieved after 3 days of curing. The grades and corresponding physical properties of bauxite cement are shown in Table 2. For calcium aluminate cement with CA2 as the main mineral, the grade is based on the strength achieved after 7 days of curing.
Calcium aluminate cement should be stored in a ventilated, dry, and light-proof place, avoiding high temperature or humid environments.
Conduct quality inspections before use to ensure the product meets quality standards.
Use according to the specified amount and method to avoid overuse or improper use.
Understand the product's performance and applicable range before use to avoid improper usage that could affect results.
