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Help CenterXinjiang Mica Phlogopite Concentrate Ore, Natural Mica
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Feature & application of mica
Brief Introduction
Mica is the generic name of the layer-structured aluminum-silicate, which consists of potassium, magnesium, aluminum, iron, lithium. It usually appears in six-square like or diamond-shaped columnar crystal, shaped in plate or sheet.
According to the differences of its chemical elements and optical characteristics, we can classify mica ore into three categories: muscovite-sericites type, phlogopite-biotite type and lithionite-lepidomelane type. The most common minerals in the mica group are: muscovite, sericite, biotite, phlogopite and lithionite.
Muscovite looks in transparent or in light color, while biotite shows in black, dark brown, or dark green. Phlogopite looks in gold, brown, dark green or transparent, while lithionite shows in light purple, rose pink or grey.
Characteristics of Mica:
1. Physical & Chemical Properties:
Mica has the gloss of glass; its cleavage surface shows pearly luster. Its Mons’ hardness scale is 2-3.5, and proportion is 2.7-3.5. The color of mica changes according to its chemical elements, if it contains chromium, it shows in green, while contains lithium, shows in rose pink.
2. Optical Properties
The thickness of mica ’s pairs of reflecting surfaces is only one fourth of the wavelength of UV light, which causes mutual interference when UV light getting through mica, therefore, mica can block the UV light. Additionally, the layer of mica’s directional distribution made it has excellent lightproof performance.
3. Electrical Properties
insulation strength:159-317kV/mm
resistivity:1014-1015 Ω·cm
surface resistivity:1011-1012Ω·cm
dielectric loss angle:tan δ=0.001-0.08(50Hz)
The prominent property of mica is its dielectric insulation. The performance of its insulating property, which decides mica playing an important role in electric industry.
4.Heat Resistance & Stability
When heated up to 100-600 ℃,the elasticity and surface features of muscovite will not be affected. After being heated up to 700-800℃, muscovite will get dehydrated and crispy, the dielectric performance will be changed; while heated up to 1050℃, its structure will get damaged.
Phlogopite has a better dielectric performance than muscovite during the temperature 700℃.
Mica will not affect to acid-alkali in room temperature, even will melt in high acid liquids. But it will get decomposed in boiling acid liquids over a long period of time.
Characteristics of Mica:
Mica, with the characteristics of high electrical insulation, which can endure high temperature and its dramatic changes, also maintains the feature of anti-acid & alkali corrosion, elasticity & toughness, processes excellent heat & sound insulation and low thermal conductivity.
Based on the unique features above, mica is wildly applied to the wireless industry, aviation, motor manufacturing, building materials & paints, fire-fighting & fire extinguisher, welding rods industries, also used in chemical industries such as, plastics, ceramics, dielectrics, paper-making, asphalt paper, cosmetics and pearlescent pigment etc.
Processed mica powder possesses good flowability & absorbability. The most widely-used mica is muscovite and followed with the phlogopite in current industry.
The Current Applications of Mica
1. On Insolation Materials
2. On Plastics Industry
3.On Paper-making Industry
4.On Coatings Industry
5. On Paints Industry
6. On Ceramics
7. On Cosmetics Field
8. On Building Materials
9. Others Fields
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