Black mica

The main specifications of the biotite produced in our factory are: 20 orders, 40 orders, 60 orders, 80 orders, 100 orders, 200 orders, 325 orders, 400 orders, 500 orders, 600 orders, 800 orders, 1000, 1250, 2500.
The chemical composition of biotite is: K (Mg, Fe2+) 3 (Al, Fe3+) Si3O10 (OH, F) 2, and the homogeneous image is substituted for a wide range, so the chemical composition of the biotite in different rocks is very wide. Black mica in general acid and alkaline magma, high FeO, low MgO; black mica in basic and ultrabasic rocks, high MgO, low FeO; black mica in alkaline pegmatite, MgO low, and Fe2O3 relatively higher.
The crystalline form of the black mica is the same as that of the gold mica. The color is black, dark brown, sometimes with light red, light green or other tones. Containing high titanium, it is light reddish brown, rich in high valent iron and green. Transparent to opaque. Glass luster, black is semi metallic luster. The hardness is 2-3, and the proportion is from 3. 0 to 3. 12. Biotite can be altered to other minerals such as chlorite, muscovite and sericite by hydrothermal solution. Because of its high iron content and poor insulation, biotite is far inferior to Muscovite. Black mica thin films are often used as filling materials for building materials. The black mica with large particle size is very easy to differentiate in the deep diagenetic and shallow rock clocks, especially in the acid or alkaline rock, especially in the acid or alkaline rock.
The distribution of mica minerals in China is uneven. Although the 20 provinces, municipalities and autonomous regions of China are distributed, most of them are concentrated in Xinjiang, Sichuan and Inner Mongolia. 184 places have been found all over the country, of which 88 places in Xinjiang, 67% of the national reserves, 27 in Sichuan, 11.4% of the national reserves, 15 in Inner Mongolia, 8.6% of the national reserves, and 13% in the remaining 54 of the country, distributed in Hebei, Shanxi, Liaoning, Jilin, Heilongjiang, Shandong, Henan, Yunnan, Tibet, Qinghai and Shaanxi. West and other places. The mica mine in Hebei is located in the middle Lingshou County of Taihang Mountains. The strata in Lingshou county are teraean double quality strata, and there are abundant mica minerals in the rock layers. By the exploration of the texture department, the reserves of the mica are 1 million 700 thousand tons, the ore grade is high and the quality is good. It is the largest producer of mica in the country. It is the largest mica processing base and the largest mica outlet in the country.
It is widely used in the building materials industry, fire fighting industry, fire extinguishing agent, welding strip, plastic, electric insulation, paper making, asphalt paper, rubber, pearlite pigment and other chemical industries. Superfine mica powder as a plastic, paint, paint, rubber and other functional filler, can improve its mechanical strength, enhance toughness, adhesion resistance to aging and corrosion resistant type. In addition to high electrical insulation, acid and alkali corrosion, elasticity, toughness and sliding, heat insulation, thermal expansion coefficient and other properties, it is the first to launch the two surface smooth surface, large diameter thickness ratio, shape rules, strong adhesion and so on.