Summary:Mica is the general name of mica group minerals. It is the aluminosilicate of potassium, aluminum, magnesium, iron, lithium and other metals. It has a layered s
Mica is the general name of mica group minerals. It is the aluminosilicate of potassium, aluminum, magnesium, iron, lithium and other metals. It has a layered structure and monoclinic system. The crystal is pseudohexagonal or plate-shaped, occasionally columnar. The lamellar cleavage is very complete, glassy and elastic. The refractive index of mica increases with the increase of iron content, from low to middle positive protuberance. The higher the iron content is, the darker the color is. At the same time, the polychromatic and absorptive properties are enhanced.
Mica minerals mainly include biotite, phlogopite, muscovite, lepidolite, sericite, phlogopite, phlogopite, etc. Muscovite and phlogopite are widely used in industry. Lepidolite is an important mineral raw material for lithium extraction.
Mica group minerals can be divided into three subgroups according to chemical composition and optical characteristics, including Muscovite subgroup, biotite phlogopite subgroup and lepidolite subgroup.
Mica ore widely exists in Asia, Africa and America, but rarely in Europe. Until the 19th century, the value of mica in Europe was still very high. With the colonists mining mica in Africa and South America, the price dropped rapidly.
Mica Block Mica has very high insulation, thermal insulation performance, good chemical stability, strong acid, alkali resistance and compression resistance, so it is an important raw material for manufacturing electrical equipment, so it can also be used as the insulation material in the blower. Mica has birefringence at the same time, so it is also an optical instrument material for making polarized light sheet. Mica mining used in electrical industry must be mica block with effective area more than 4 square centimeter, without crack and perforation, and non mica mineral on the edge shall not exceed 3 mm. After mining, the quality of mica can be divided into four types according to the effective area, and the best special type area is more than 65 square centimeters.
Muscovite is the most widely used in industry, followed by phlogopite. It is widely used in building materials industry, fire fighting industry, fire extinguishing agent, welding rod, plastic, electrical insulation, paper making, asphalt paper, rubber, pearlescent pigment and other chemical industries.
Mica is not easy for grinding , but SBM’s super micron mill can do the job. It can grind mica into 300mesh, 400mesh and 600mesh with very good performance.
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