Dolomite Origin, Economic Use, Difference And Protection
According to the Taiwan Minerals Bureau (1996) "Major minerals and rocks in Taiwan", dolomite is found in crystalline limestone and other magnesium-rich metamorphic rocks, and is partially produced in the pores of hydrothermal veins and carbonate rocks. Occasionally used as a cement for various sedimentary rocks, it is the most common rock-forming mineral in carbonate rock. The dolomite of Taiwan is formed by the calcareous exchange of magnesia-exchanged limestone, which mainly occurs in the crystalline limestone zone of the lower part of the Great South Australia schist, which is a convex mirror body, a layered or irregular mineral sac.
Dolomite can be used as a refractory inner layer, a slag forming agent, a cement raw material, a glass flux, a kiln industry, a fertilizer, a stone for construction and decoration, a paint, an insecticide, and a medicine for a reformer used in steel making. Can be used in building materials, ceramics, glass and refractory materials, chemical and agricultural, environmental protection, energy conservation and other fields.
The main components of the dolomite mine are calcium carbonate and magnesium carbonate. This stone looks very close to limestone in appearance, and in fact, dolomite is often found in areas where limestone deposits are found. Most dolomite deposits contain a certain proportion of limestone. The important basis for distinguishing dolomite is that the content of dolomite minerals in the rock is not less than 50%. In addition, dolomite is a porous stone. Because the chemical constituents of dolomite are not sensitive to acidic substances, dolomite has better weather resistance.
In general, two methods of hardness testing and acid testing are used to distinguish limestone from dolomite.
The Mohs Hardness Test (MOH) is a simple mechanical test in which a stone of another known hardness is used to scrape the stone. The hardness of the dolomite is thus measured to be between 3 and 4. The acid test method is to apply the diluted hydrochloric acid to the surface of the stone, the limestone reaction is strong, and the dolomite reaction is not obvious, and the surface will form a powder. If the above test results are not obvious, you need to do laboratory analysis. If you know the source of the stone, the mineral type and composition will be clear.
In general, marble, limestone and dolomite can be used interchangeably as building materials. But even the stones belonging to the same category have different physical properties. Before deciding which type of stone is most suitable for use, all factors such as the absorbency, density and structural integrity of the stone should be taken into account. Can learn from the stone use of other buildings. For example, the exterior wall of a 100-year-old building can be used as a reference for exterior engineering.
Limestone is highly absorbent. In view of this feature, when paving the ground with limestone, it is necessary to take into account the pollution that may occur in the future. Use high-density and low-absorbent stone in areas that are susceptible to environmental damage and heavy stress.
From the perspective of historical buildings, dolomite is used as the outer wall surface and is more resistant to weathering or erosion than marble and limestone. Because of its low calcite content, atmospheric pollution (mainly acid-based) is more resistant to weathering.
In general, marble, dolomite and limestone are softer materials. Therefore, during the construction process and in the future use process, it is highly susceptible to external pollution, and exposes its weak point of poor stain resistance, such as being susceptible to rain, dirt and the like. Compared with granite, these three types of stone have high water permeability and are more susceptible to pollution. The best way to solve this problem is to protect it.
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.
Since its inception, with "business integrity, standard services, sustainable development, commitment to the community" is the principle of the company. Our company has a good reputation, which is oriented by customers' demands, strives for survival by quality reputation, relying on high-quality products and good services.
Addr.: Dayanggou Village Jiguanshan
Town Fengcheng City Dandong,
Contact: Lianchun Yang
Post Code: 118102