Dolomite-related Research
The molecular formula of dolomite is CaCO 3 MgCO 3 . Theoretical composition: CaO 30.4%, MgO 21.9%, CO 2 47.7%. It often contains impurities such as silicon, aluminum, iron, and titanium. Main use: It is used as a flux in the tire glaze. Some ancient kiln in the north, such as Ding kiln, often add dolomite to the glaze, and dolomite is also added to some glazes in Jingdezhen. The chemical composition of dolomite is CaMg[CO3]2, and the crystal belongs to the trigonal carbonate mineral. The crystal structure of dolomite is similar to calcite. The crystal form is rhombohedral. The crystal face is often bent into a saddle shape. The polycrystalline twin crystal is common, and it is mostly in the form of massive or granular aggregates. Pure dolomite is white, and it is sometimes grayish green, grayish yellow, pink, etc. due to other elements and impurities, and the glass is lustrous.
The dolomite is not only symbiotic with oil and gas reservoirs, but also closely related to the salt or metal deposits. The formation of dolomite is still controversial. The focus is on the source of Mg2+ in the process of dolomitization. The role of dolomitization is often closely related to the deep activities of the basin, and is generally controlled by deep hydrothermal activities. In the basins where dolomitization is more developed, a low-velocity-high-conductivity layer of the middle crust is common in the deep.
According to the homogeneous temperature data of fluid inclusions, it is found that the ambient temperature of dolomite formation is higher than calcite and is usually much higher than the normal formation temperature. According to the comprehensive study, the low-velocity-high-conductivity layer in the deep crust of the basin is serpentine petrified peridotite, which releases a large amount of Mg2+ during the serpentine petrochemical process. The Mg2+-containing hydrothermal fluid rises into the carbonate rock of the basin and the magnesium is strongly formed with CaCO3. It is metamorphic to form dolomite; there are salt precipitates in the hot liquid due to halogen F, Cl, Br and alkali metals K, Na, Li, etc. The hydrothermal fluid also contains CO, CO2, H2, etc., which are in serpentine In the peridotite, Fischer-Tropsch synthesis can be carried out to synthesize hydrocarbons; the iron group metals such as Ni, Cr, Co, V released in the serpentine process are good catalysts.
Dolomite can be used in building materials, ceramics, glass and refractory materials, chemicals and agriculture, environmental protection, energy conservation and other fields. Mainly used as a flux for alkaline refractory materials and blast furnace ironmaking; production of calcium magnesium phosphate fertilizer and preparation of magnesium sulfate; and production of glass and ceramic ingredients. The use is also incorporated into the glaze as a flux. Some ancient kiln in the north, such as Ding kiln, often add dolomite to the glaze, and dolomite is also added to some glazes in Jingdezhen.
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