Dolomite

Dolomite is formed primarily through a geological process called dolomitization, where magnesium-rich fluids gradually replace calcium ions in limestone or calcareous mudstone. This process results in the formation of sedimentary rocks composed primarily of dolomite.

Dolomite is composed of calcium and magnesium carbonate and has the chemical formula CaMg(CO₃)₂. Dolomite crystallizes in the trigonal-cubic system and has rhombic crystals that are colorless to light-colored, but may appear pink or brown due to impurities such as iron or manganese.

Dolomite has a Mohs hardness of 3.5 to 4, which is relatively soft compared to other minerals. It has a perfect fracture in three directions and a specific density of 2.8 to 2.9 g/cm3.

Description of the calcination process

• Mining: Dolomite, lime or magnesite is mined.
• Grinding: The raw rock is ground into smaller pieces.
• Preheating: The ground rock is preheated in rotary kilns.
• Calcining: The preheated dolomite rock is calcined at high temperatures (usually between 700 and 1100 degrees Celsius).
• Cooling: The calcined products are cooled and ground into powder or granulated form.