The main components of dolomite are calcium carbonate and magnesium carbonate. As an important source of calcium and magnesium on the earth, dolomite can be divided into iron dolomite and manganese dolomite. It will slowly bubble out when exposed to cold and dilute hydrochloric acid. Some dolomites emit orange-red light under cathode ray irradiation. With the development of modern science and technology, with the help of the grinding principle of the mill, dolomite is a non-metallic mineral resource that can be developed and utilized in many ways, and has become a non-metallic mineral resource of great economic value.
1. Magnesium smelting industry: Dolomite with a raw ore size of 30120mm is an important raw material for the production of metallic magnesium. At present, in China, the smelting of metal magnesium generally adopts the silicothermal reduction method, and the output rate of magnesium is consistent with the activity of calcined dolomite;
2. Hole plugging material for iron-making blast furnace: If 030mm dolomite burnt white is used as the material for iron-making blast furnace hole plugging. The sales price is about 1,000 yuan/t, which has a good prospect;
3. Production of magnesium carbonate: the production of magnesium carbonate requires the chemical composition of dolomite (% as follows: MgO>18CaO>29SiO2<4. There is no definite requirement for the content of K2ONa2O and acid insoluble matter.
4. Production of magnesium oxide: The new domestic process for extracting magnesium oxide from dolomite is the dolomite recycling method. In addition, the production process and method for preparing special silicon steel grade magnesium oxide using dolomite as the main raw material has also been developed;
5. Production of magnesium sulfate: use dolomite to produce magnesium sulfate. At the same time, by-product CaSO4? H2O can be obtained, not only magnesium sulfate (MgSO4? 7H2O crystals;
6. Production of magnesium hydroxide: It can be obtained by dolomite ammoniating method or acid method decomposing dolomite
7. Glass production: Dolomite and limestone are the third largest components of glass raw materials except silica sand and soda ash. The method of introducing magnesium oxide in dolomite can further reduce the cost and improve the chemical stability and mechanical strength of the product;
8. Ceramics field: Dolomite is used in blanks and glazes to reduce the firing temperature of the blanks and promote the dissolution of quartz and the formation of mullite;
9. Environmental protection field: Dolomite powder can be used to improve the flying of dust in coal mines, as a filter for water treatment.