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General
- Kyanite,
andalusite and sillimanite are minerals with the same chemical formula,
but with different crystal structures and chemical properties.
- The
theoretical composition is about 63 percent alumina and 37 percent
silica.
Process
- Kyanite
is available in varying grain sizes down to 325 mesh and in
calcined-to-mullite form.
- The
decomposed mullite form is volume-stable with temperature increase,
while the raw form of kyanite displays definite expansion during heatup.
Market
- The
United States is the largest producer, with all of the kyanite coming
from central Virginia.
- Kyanite
Mining Corp-oration’s ore deposits are kyanite quartzites containing 15
to 40 percent kyanite and usually about 5 percent of other minerals such
as mica, pyrite and rutile.
Application
- The
interlocking grain structure of andalusite, kyanite and mullite gives
added mechanical strength to refractories and other nonrefractory
ceramic materials.
- Other end
uses of kyanite and related materials include brake shoes and pads,
electrical porcelain, foundry use, precision casting molds and sanitary
ware.
- It is
used primarily as an additive in the production of high-temperature
ceramic products such as furnace bricks, but is also used in abrasives,
brake shoes, cookware, and a wide variety of other industrial and
consumer products.
- Kyanite
has proven invaluable in cements, ramming mixes, and mortars for this
purpose.
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