Dolomite is a carbonate mineral, including iron dolomite and manganese dolomite. Its crystal structure resembles calcite, often appearing as rhombohedral crystals. It slowly effervesces when exposed to cold dilute hydrochloric acid. Some dolomite exhibits an orange-red glow under cathode ray irradiation. Dolomite is the main mineral component of dolomite and dolomitic limestone. Dolomite can be used in building materials, ceramics, glass and refractory materials, chemicals, agriculture, environmental protection, and energy conservation. It is mainly used as an alkaline refractory material and flux in blast furnace ironmaking; in the production of calcium magnesium phosphate fertilizer and magnesium sulfate; and as an ingredient in the production of glass and ceramics.
Various quality dolomite products: Dolomite ore, dolomite sand (6-10 mesh, 10-20 mesh, 20-40 mesh, 40-80 mesh, 80-120 mesh), dolomite powder (10 mesh), dolomite ultrafine powder (140 mesh, 325 mesh, 600 mesh, 1000 mesh, 1600 mesh). When heated to 700-900℃, dolomite decomposes into a mixture of carbon dioxide, calcium oxide, and magnesium oxide, known as caustic magnesia, which readily reacts with water. When dolomite is calcined at 1500℃, magnesium oxide becomes periclase, and calcium oxide transforms into crystalline α-CaO, resulting in a dense structure, strong water resistance, and a refractoriness up to 2300℃.
Dolomite deposits in China are distributed within carbonate rock systems, with older strata containing more deposits, primarily concentrated in the Sinian System. Examples include the Liaohe Group in Northeast China, the Sangzi Group in Inner Mongolia, and the Jian'ou Group in Fujian. Furthermore, dolomite deposits are also widespread in the Sinian and Cambrian Systems, with large deposits found in areas such as the Liaodong Peninsula, eastern Hebei, Inner Mongolia, Shanxi, and Jiangsu. Dolomite deposits in the Carboniferous and Permian Systems are mainly distributed in Hubei, Hunan, Guangxi, and Guizhou provinces.
China is rich in dolomite resources, and the proven reserves can meet the needs of economic development. Most of the deposits have been developed and utilized, and the production areas are spread throughout the provinces, with the largest output in the Kazuo County area of Chaoyang City.
