Energy-saving hydraulic cement production process

In June 2003, France developed a cement production process that can significantly reduce energy consumption. Its main technical features are as follows: First, the cement is a mixture of active volcanic ash, which is a latent hydraulic material, and cement clinker, which is an active material that can produce hydraulic properties of active products. The amount of the second active triad is not Above 95%, the total amount of active material is more than 5%: The active product is a mixture of calcium oxide containing silicon, iron, and aluminum, and calcium carbonate, which is tightly mixed with raw calcium carbonate and burned at 700-900 degrees Celsius. The partial pressure of carbon dioxide is maintained to prevent thermal decomposition of calcium carbonate, dehydration and oxidation, and the use of clay phase and its latent hydraulic calcium compound are simultaneously activated without formation of free calcium oxide surface.
Compared with the cement produced by ordinary methods, the cement produced in the Ming Dynasty has a compressive strength of 10 Mpa or more for 1 day and a compressive strength of 45 Mpa in 28 days. This process not only significantly saves energy, but also significantly reduces the environmental pollution caused by dust.