Dolomite crystals are carbonate minerals. Most of the dolomite raw materials are relatively pure, with MgO content >19%, CaO content >30%, CaO/MgO ratio between 1.40-1.68, and low impurity content. Dolomite is widely used in the building materials, glass, ceramics, metallurgy, rubber, welding, paper, plastics and other industries. In addition, it has also been applied in the fields of agriculture, environmental protection, energy conservation, medicine and health care.
Dolomite is selected as a dolomite powder after being sorted, crushed, and ground to 325 to 1250 mesh. Dolomite powder is added to natural rubber and synthetic rubber, and its rubber properties are basically the same as those of adding light calcium powder, but the cost is lower than that of light calcium powder. The use of dolomite to produce rubber universal calcium magnesium powder, as a new type of filler and colorant, can partially or completely replace light calcium powder and lithopone. The surface-modified dolomite powder can greatly enhance the reinforcing performance of the rubber product. The modified dolomite powder is surface-coated with a surface modifier for dolomite powder and then used as a filler. Commonly used surface modifiers are stearic acid or stearic acid fat, titanate, zirconium aluminate, mixed silane coupling agents and the like. The purpose of the modification is to change the surface alkalinity of the dolomite powder, overcome the bonding property between the filler and the rubber, reduce the shrinkage and internal stress, prevent the crack from spreading, and improve the processing property of the product strength.
Dolomite is used the chemical industry to produce magnesium carbonate. The chemical composition (%) of dolomite required for the production of magnesium carbonate is as follows: MgO>18, CaO>29, SiO2<4, and there is no certain requirement for k2o, na2o and acid insoluble content. At present, the production of light magnesium carbonate by dolomite carbonization is widely used in China. This product is a basic raw material for inorganic chemicals. It is mainly used in the manufacture of magnesium salts, magnesium oxide, elemental magnesium, fireproof materials, printing inks, ceramics, chemicals, rubber products fillers and reinforcing agents. It can also be used in shipbuilding, boilers, Steelmaking, glass, pigments, pharmaceuticals and other industries.
Magnesium oxide is widely used in industries such as rubber, enamel, wire and cable, etc. as a filler. In addition, magnesium oxide is also an indispensable refractory material. At present, the new process for extracting magnesia from dolomite in China has a dolomite circulation method. In addition, the production process and method for preparing special silicon steel grade magnesia with dolomite as the main raw material has also been developed.
For the application of dolomite in powder, we have customer sites in many countries. For example, we have a coarse powder field for processing dolomite in Gujarat, India. At the time, the customer requested 200 mesh processing and the screening rate was D99. The current output of the equipment is stable and the output can reach 8 tons. The customer uses the new MTW series European version of the trapezoidal mill for our Shanghai Zenith Mining Machinery Co., Ltd. Compared with the traditional mill, the MTW mill of Zenith has the advantages of low energy consumption, high output and low noise when the host power is 90KW.
The following is a specific comparison between the MTW mill and the conventional mill at a host power of 90 kW.