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wet ground mica powder mills

wet ground mica powder mills

Mica Natural Pigments

Mica is a group of sheet silicate minerals that includes several closely related materials having highly perfect basal cleavage. All are monoclinic with a tendency towards pseudo hexagonal crystals and are similar in chemical composition. The highly perfect cleavage, which is the most prominent characteristic of mica, is explained by the hexagonal sheet like arrangement of its atoms. Common micas include biotite, lepidolite, muscovite, phlogopite and zinnwaldite. Muscovite mica is a phyllosilicate mineral of aluminum and potassium with the formula KAl22, or 236. It has a highly perfect basal cleavage yielding remarkably thin laminae which are often highly elastic. Muscovite has a Mohs hardness of 2.0 to 2.5 parallel to the face, 4.0 perpendicular to the face and a specific gravity of 2.76 to 3.00. It can be colorless or tinted through grays, browns, greens, yellows, or violet or red, and can be transparent or t...

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Mica is produced in many countries around the world. In the United States, North Carolina is the major producer, accounting for more than half of the total domestic output. The remainder is produced in nine other states. Mica mining in the United States is confined largely to pegmatites and schists. Most mica is obtained by crushing and milling pegmatites and to a lesser extent as a byproduct of feldspar and spodumene mining. Mica is one of the most difficult minerals to grind. Some of the same properties that make mica useful make it difficult to grind. Even thin flakes are tough and elastic and resist abrasion and reduction in size by conventional types of grinding equipment. Two processes, dry grinding and wet grinding, are employed to produce ground mica. The products of the two processes differ from each other in certain physical properties. Wet ground mica, which retains the brilliancy of its cleavage faces, is used primarily in pearlescent paints. Many metallic looking pigmen...

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Mica is not considered to be a hazardous material, but care must be exercised when using the powder to avoid inhaling it, which can irritate the lungs and aggravate a pre existing respiratory condition.

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2 KAl 2 2 $7.50 $11.50 Fine wet ground muscovite mica
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