What properties does mica have?
Mica is a collective name for minerals of the mica family, which are aluminum silicates of potassium, aluminum, magnesium, iron, lithium and other metals, all of which are layered and have a monoclinic crystal system. The crystals are pseudo-hexagonal sheets or plates, occasionally columnar. The lamellar solution is very complete, has a glassy luster, and the flakes are elastic. The refractive index of mica increases accordingly with the increase of iron content, and it can be from low orthorhombic to medium orthorhombic. Iron-free varieties, colorless in thin section, the higher the iron content, the darker the color, while the polychromaticity and absorption enhancement
Mica ore mainly includes black mica, gold mica, white mica, lithium mica, sericite, green mica, iron lithium mica, etc. Alluvial goldstone is a mixture of mica and quartz minerals. The most used in industry are white mica and gold mica, and lithium mica is an important mineral raw material for refining lithium.
Mica block mica has very high insulating and adiabatic properties, good chemical stability, resistance to strong acids, alkalis and pressure resistance, so it is an important raw material for the manufacture of electrical equipment, so it can also be used as an insulating material inside the hair dryer. Mica also has the ability of birefringence, so it is also an optical instrument material for the manufacture of polarized light sheet. Mica mining for the electrical industry must be a mica block with an effective area of more than 4 square centimeters and without cracks, perforations, and with no more than 3 mm of non-mica minerals on the edges. The quality of mica after mining is divided into 4 categories according to the effective area, and the best special category has to be larger than 65 square centimeters.
The most used in industry is white mica, followed by gold mica, which is widely used in building materials industry, fire fighting industry, fire extinguishing agents, welding rods, plastics, electrical insulation, papermaking, asphalt paper, rubber, pearlescent pigments and other chemical industries.
Uses
Black mica is mainly utilized in the industry for its insulating and heat-resistant properties, as well as resistance to acid, alkali, pressure and stripping, and is used as an insulating material for electrical equipment and electrical appliances; and secondly, it is used in the manufacture of windows of steam boilers and smelting furnaces, and parts of machinery. Crushed mica and mica powder can be processed into mica paper, and can also be used instead of mica flakes to make various kinds of low-cost, uniform thickness insulating materials.
The main application is white mica, followed by gold mica, which is the most used in industry. It is widely used in building materials industry, fire-fighting industry, fire extinguishing agent, welding rod, plastics, electric insulation, paper making, asphalt paper, rubber, pearlescent pigment and other chemical industries. Ultrafine mica powder for plastics, coatings, paints, rubber and other functional fillers, can improve its mechanical strength, enhance the toughness, adhesion anti-aging and corrosion resistance type. In addition to very high electrical insulation, acid and alkali corrosion resistance, elasticity, toughness and sliding, heat and sound insulation, small coefficient of thermal expansion and other properties, but also the first to launch the flake two smooth surface, diameter-thickness ratio, the shape of the regularity of the strong adhesion and other characteristics.
