Mica is layered silicate mineral containing water, divided into muscovite, biotite and lepidolite. Generally the Mohs hardness of Mica is 2-3.5. The bottom surface is completely parallel cleavage and the mica can be stripped into a transparent sheet with elasticity. Mica has a thermal expansion coefficient, good thermostability, gloss, anti-corrosion for acid and alkali, good insulation, non-flammable, good flexibility and toughness, strong adhesion and so on stable chemically features.
Currently, India accounts for 90 % of the world reserves of mica and the export volume accounted for 60% of total world exports. Secondly, China, the United States, Australia and other countries is the major regional of mica production.
The area of mica more than 4 square centimetre is called mica splitting, which beneficiation methods include, hand-selected, friction election and shape election. The area of mica less than 4 square centimetre is called clastic mica, its beneficiation methods include, flotation and dry blowing. Flotation is based on the different physical and chemical properties of the surface of mica and gangue for sorting. By mica ore crushing and mica ore grinding, the mica monomer dissociate from each other. In the role of agents, mica became foam products and separated from the gangue.
Mica ore beneficiation is the enrichment process for raw material mica. As the mica crystals without defects is larger, the higher of the economic value. Therefore, we should as much as possible to protect the natural mica crystals from destruction in the mica ore beneficiation process. Customarily, the beneficiation method is flotation, because it is easy to operate, convenient and simple. After flotation, the mica has a very wide range of application, the industry is mainly the direct use of natural mica crystals processed into the desired products.
The most used in industry is muscovite, followed by phlogopite. It is widely used in building materials, extinguishing and protection, fire extinguishing agents, welding, plastics, electrical insulation, paper, asphalt paper, rubber, pearlescent pigments and other chemical industries. Lepidolite is the main raw material extraction of lithium.
Due to the success of large crystals of synthetic mica, the world's demand for large mica will be gradually reduced. A large amount of natural mica mining will reduce year by year, while the demand for mica fragments will continue to increase. It is estimated that the world demand for sheet mica is continued to decline at an annual rate of 4.6 percent, while demand for mica fragments grow at an average annual rate of 1.5% percent.
In recent years, because of its low price, the utilization of natural mica has been expanding. These mica in the applications need to be processed into the fine mica powder and then processing. With the 2-3.5 Mohs hardness, the mica grinding plant has many kinds, such as the mica ball mill, mica vertical grinding mill, mica trapezium mill, mica medium speed trapezium mill, mica strengthened ultrafine mill.
For the hardness of mica grinding, the mostly used is the mica ball mill made by SBM. It is the key equipment that pulverizes the materials after they are crushed. Ball mills are used primary for single stage fine grinding, regrinding and as the second stage in two stage grinding circuits. According to the need of customers, ball mill can be either wet or dry designs. Ball mills have been designed in standard sizes of the final products between 0.074 mm and 0.4 mm in diameter. So SBM mica grinding plant has been warmly popular all over the world.
Shanghai SBM is the leading professional supplier of solution, equipment and service for crushing and grinding industry. In past 20years, a set of SBM mica processing plant with excellent performance has obtained an enviable reputation from the customers over 120 coumtries in the world.
Now the engineer of SBM designs the mica production line according to the different consumer needs. The whole mica production line consists of mica vibrating feeder, mica jaw crusher, mica impact crusher, mica cone crusher, mica vibrating screen, mica ball mill and so on. The main specifications of the final products is 20 mesh, 40 mesh, 60 mesh, 80 mesh, 100 mesh, 100 mesh, 200 mesh, 325 mesh, 500 mesh, 600 mesh, 800 mesh, 1000 mesh, 1250 mesh and do everything possible to meet different needs.
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