Common Products Of Dolomite
A refractory product made from calcined dolomite sand. Usually, it contains 40% or more of calcium oxide (CaO), more than 35% of magnesium oxide (MgO), and contains a small amount of impurities such as silicon oxide (SiO2), aluminum oxide (Al2O3), and ferric oxide (Fe2O3). The CaO/MgO ratio of natural dolomite fluctuates greatly. If the CaO/MgO ratio in the brick is less than 1.39, it is called magnesia dolomite brick. According to the production process, dolomite bricks can be divided into: tar (asphalt) combined with non-burned bricks, light-burned oil-impregnated bricks and fired oil-impregnated bricks. Dolomite bricks contain free CaO, which is easy to hydrate and crack in the air, and should not be stored for a long time.
The raw material dolomite is a double salt of calcium carbonate and magnesium carbonate. The molecular formula is CaCO3·MgCO3, hexagonal system, the specific gravity is 2.80~2.99, the Mohs hardness is 3.5~4.5, and the theoretical composition is CaO30.41%, MgO21.87%, CO247. 72%, CaO/MgO ratio is 1.39. China's dolomite is rich in resources and excellent in quality. Its composition is shown in Table 1. Since the 21st century, in addition to natural dolomite sand for brick making materials, synthetic magnesium dolomite sand made from seawater and lime milk has been used to produce high-quality magnesium. Dolomite bricks.
China's converter lining mainly uses tar-bonded dolomite bricks and tar-bonded magnesia dolomite bricks. Some factories use light-burning oil immersion and burning oil-impregnated magnesia dolomite bricks in vulnerable parts. Converters in countries such as Western Europe and Japan mainly use tar combined with heat-treated and fired oil-impregnated dolomite bricks and magnesia dolomite bricks. In addition, the fired oil-impregnated magnesia dolomite bricks are also used as linings for certain refining furnaces outside the furnace.
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, and 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. Dolomite handicrafts According to the uniform 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.
FENGCHENG CITY HEQI BRUCITE MINING CO., LTD is registered in Dandong city, Liaoning province. Sufficient talent reserves, proper environmental governance, convenient transportation and communication.We are mainly engaged in the purchase, processing and sales of mineral products.
Main products: magnesium hydroxide flame retardant and brucite powder. Complete specifications of products, welcome to visit our factory guidance.
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