Cement production involves a large amount of water usage, and proper water treatment is essential. PAC is used to purify the industrial water used in the cement manufacturing process. It can effectively remove impurities, suspended solids, and colloidal substances in the water. By doing so, it not only ensures the quality of the water used in the production line but also helps in preventing the clogging of pipelines and equipment, thus reducing maintenance costs and downtime. For example, in the raw material washing and grinding processes, clean water treated by PAC can improve the fineness and uniformity of the raw materials, which is beneficial for the subsequent cement clinker formation.

During the cement production process, especially in the sedimentation stage of cement slurry, PAC acts as a powerful coagulant. It promotes the flocculation of fine cement particles. When added to the cement slurry, PAC can quickly neutralize the surface charges of the particles, causing them to aggregate into larger flocs. These larger flocs settle more rapidly, which significantly shortens the sedimentation time. This not only improves the production efficiency but also helps in obtaining a more compact and high - quality cement product. A faster sedimentation process also means that the production cycle can be shortened, leading to increased productivity.

PAC has the ability to adjust the pH value of the reaction environment in certain cement - related processes. In some cases, maintaining an appropriate pH is crucial for the chemical reactions involved in cement production. For instance, in the activation of some supplementary cementitious materials, a specific pH range is required to fully utilize the reactivity of these materials. PAC can be used to fine - tune the pH value, ensuring that the chemical reactions proceed smoothly and that the desired properties of the final cement product are achieved.

Indirectly, the use of PAC in the cement production process can contribute to enhancing the strength and durability of cement products. By improving the water quality, flocculation, and reaction conditions, the internal structure of the cement is more uniform and compact. A well - structured cement matrix can better withstand external forces and environmental factors, such as compression, tension, and chemical corrosion. This results in cement products with higher strength and longer - lasting durability, which are highly desirable in construction projects.

In conclusion, polyaluminum chloride coagulant has multiple and significant applications in the cement industry. From water treatment to improving the quality of the final cement products, its role cannot be underestimated. As the cement industry continues to pursue higher - quality and more efficient production methods, the application of PAC is likely to become even more widespread and refined.