Dolomite is an important carbonate mineral.
Chemical composition and crystal structure: The chemical composition of dolomite is CaMg(CO3)2, and its crystals belong to the trigonal crystal system. Its crystal structure is similar to calcite, often exhibiting a rhombohedral shape, with crystal faces frequently curved into a saddle shape, and polysynthetic twinning is common. Dolomite mostly occurs in massive or granular aggregates.
Physical properties: Pure dolomite is white, but due to the presence of other elements and impurities, it can sometimes appear grayish-green, grayish-yellow, or pink. It has a vitreous luster, perfect trihedral cleavage, and is brittle. The Mohs hardness of dolomite is between 3.5 and 4, and its specific gravity is 2.8 to 2.9. Its mineral powder reacts relatively slowly in cold dilute hydrochloric acid.
Types and luminescent properties: Dolomite is a type of carbonate mineral, including iron dolomite and manganese dolomite, among others. Some dolomite exhibits an orange-red glow under cathode ray irradiation, a characteristic that gives it unique application value in specific fields.
Wide Range of Uses: Dolomite is a major mineral component of dolomite and dolomitic limestone, finding wide applications in numerous sectors. It can be used as an alkaline refractory material and a flux in blast furnace ironmaking, and is also used in the production of calcium magnesium phosphate fertilizer and magnesium sulfate. Furthermore, dolomite is an important ingredient in the production of glass and ceramics. It plays a vital role in building materials, ceramics, glass and refractory materials, chemicals, agriculture, environmental protection, and energy conservation.
Processing and Calcination Characteristics: Dolomite can be processed into products of different particle sizes, such as dolomite ore, dolomite sand (6-10 mesh, 10-20 mesh, 20-40 mesh, 40-80 mesh, 80-120 mesh, etc.), and dolomite powder (10 mesh passing through, ultrafine powder 140 mesh, 325 mesh, 600 mesh, 1000 mesh, 1600 mesh, etc.). When dolomite is heated to 700-900℃, it decomposes into a mixture of carbon dioxide and calcium oxide and magnesium oxide (caustic magnesia), which readily reacts with water. When dolomite is calcined at 1500℃, its structure becomes denser, its water resistance is stronger, and its refractoriness reaches up to 2300℃.
Geological Distribution and Resources: Dolomite deposits in my country are mainly distributed in carbonate rock formations, with older strata containing more deposits. The proven dolomite resources are abundant and can meet the needs of economic development. Production areas are distributed throughout all provinces, with the largest output found in the Kazuo County area of Chaoyang City.
