vermiculite

Vermiculite flake is the name of vermiculite raw ore, and it is the general name of non expanded vermiculite. After the vermiculite is exploited, the impurities are removed and the vermiculite appears to be flaky, so it is called vermiculite, also called the vermiculite, vermiculite, vermiculite, unexpanded vermiculite, and unexpanded vermiculite. Its chemical formula is: (Mg, Ca) 0.3-0.45 (H2O) n{(Mg, Fe3, Al) 3[(Si, Al) Si (c) x.
The name of the mineral from the vermiculite piece comes from Latin, with "worm like" and "worm shaped" meaning. The vermiculite flake is heated to 800 degrees after expansion and deformation, and the expansion process is bending deformation, then the vermiculite is a bit like leech (leech, commonly known as leech), so it is named. Vermiculite chips are generally brown, yellow, dark green, and glossy with oil. After heating, they turn yellow, brown and light white. Vermiculite can be used as building materials, adsorbents, fire insulation materials, mechanical lubricants, soil amendments, and so on.
Physical and chemical properties are often assumed to be assumed by biotite or mica. Mostly brown, brown, golden, bronze, sometimes green. Gloss is weaker than mica, grease gloss or pearl luster. The cleavage is complete, the thin piece has the flexibility. The hardness is 1~1.5. Relative density 2.4~2.7.
Polarizing mirror: colorless to light brown. The two axis crystal (-), the light axis angle is very small. Ng=1.545~1.585, Nm =1.540~1.580, Np=1.525~1.560.
Expansibility; cation exchange and adsorption; expanded vermiculite also has good water absorption; sound insulation; heat insulation and fire resistance; frost resistance; the chemical properties of expanded vermiculite are stable. Insoluble in water. The pH value is 7~8. Nontoxic, tasteless, without side effects.
The occurrence and assemblage are mainly the products of biotite alteration and biotite alteration. Some vermiculite is formed by weathering of biotite.
[industrial application] mainly used in agriculture, environmental protection, building materials and other fields.
Other applications: as filler, friction material can be used as a reinforcing agent and heat stabilizer. The brake pads made from vermiculite have good heat resistance, shear strength and bending strength, and the braking effect is good. The perfume made from vermiculite is the characteristic of long spoil time.
The chemical formula of vermiculite flake is (Mg, Ca) 0.7 (Mg, Fe, Al) 6.0[(Al, Si) 8.0] (OH4.8H2O). Monoclinic system, usually flaky. Brown, yellow, or ancient copper. The grease is luster. The hardness is 1~1.5. Density 2.4~2.7g/cm3, vermiculite roasted at 800~1000 C, the volume expanded rapidly, increased by 6~15 times, and the height reached 30 times. The average bulk density of expanded vermiculite is 100~200Kg/m3, because the vermiculite with calcination expansion has small air interlayer, so it has excellent thermal insulation performance.