Kyanite & Related Materials                       Process, General Information, Market, Commodity Report, Technology, Patent, Report       
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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-orationís 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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