1, chemical composition.
Mica, a complex silicate, is a kind of hydrous aluminosilicate minerals with layered structure and containing lithium, sodium, potassium, magnesium, aluminum, zinc, iron and vanadium.
2. Appearance characteristics.
Layered structure, monoclinic system, the crystal is pseudo-hexagonal flake or plate, occasionally columnar, with glass luster, and the flake is elastic.
3. Subdivide the categories.
Mica minerals mainly include biotite, phlogopite, muscovite, lepidolite, sericite, green mica, zinnwaldite, etc. The placer is a mixed mineral of mica and Shi Ying.
Use of mica:
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 electrode, plastic, electrical insulation, paper making, asphalt paper, rubber, pearlescent pigment and other chemical industries.
Ultrafine mica powder can be used as functional filler for plastics, coatings, paints, rubber, etc., which can improve its mechanical strength, toughness, adhesion, aging resistance and corrosion resistance.
In addition to high electrical insulation, acid and alkali corrosion resistance, elasticity, toughness and sliding, heat and sound insulation, small thermal expansion coefficient and other properties, it is the first to introduce the characteristics of smooth two surfaces, large diameter-thickness ratio, regular shape and strong adhesion.