Introduction:
Mica is a general term for mica minerals, and it is an aluminosilicate of metals such as potassium, aluminum, magnesium, iron and lithium, all of which are layered and monoclinic. The crystal is pseudohexagonal sheet or plate, and occasionally columnar. The layered cleavage is very complete, with glassy luster and the flake is elastic. The refractive index of mica increases with the increase of iron content, which can be from low positive protrusion to positive protrusion. Iron-free varieties are colorless in the flakes. The higher the iron content, the darker the color, and at the same time, the multicolor and absorbency are enhanced.
Mica minerals mainly include biotite, phlogopite, muscovite, lepidolite, sericite, green mica, zinnwaldite, etc. The placer stone is a mixed mineral of mica and Shi Ying. Muscovite and phlogopite are the most widely used in industry, and lepidolite is an important mineral raw material for extracting lithium.
Use:
I. Industrial use:
In industry, biotite is mainly used as an insulating material for electrical equipment and electrical equipment by its insulation and heat resistance, as well as its acid resistance, alkali resistance, compression resistance and peeling resistance. Secondly, it is used to manufacture steam boilers, furnace windows of smelting furnaces and mechanical parts. Mica crumbs and mica powder can be processed into mica paper, and can also replace mica sheets to make various insulating materials with low cost and uniform thickness.
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.
Second, mica medicinal:
Mica, sweet in taste, flat in nature, and the attending muscles are as insensitive as dead people. Cold and fever caused by wind pathogen, just like the body sitting on a boat, dizzy, has the functions of removing common cold, enriching the five internal organs, increasing fertility, making eyes bright, keeping the body light and dexterous for a long time, and prolonging life. Also known as yunzhu, Yunhua, Yunying, Yunye, Yunsha and Phosphorite, it is produced in the middle and deep mountains.