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Kyanite Information

Kyanite is a silicate mineral, usually found in aluminium-rich metamorphic pegmatites and/or sedimentary rock.

Industrial Uses of Kyanite
Kyanite is used to manufacture a wide range of refractory products such as the bricks, mortars and kiln furniture used in high-temperature furnaces.  In foundries, the moulds that are used for casting high-temperature metals are regularly made with Kyanite.

Kyanite is found in products which are used in the railroad and automotive industries, where heat resistance is important. At higher temperatures, Kyanite converts to Mullite that is an excellent material for good thermal shock resistance, creep resistance, high hot strength and chemical corrosion resistance. It is used to reduce thermal cracking during the manufacturing process. Mullite is used to make brake linings and clutch facings. Mullite imparts the right amount of abrasion/ friction to the products resulting in an increased life and ensuring they do not “lock-up”. Almost all brake-linings used in railroad vehicles and large trucks contain between 50-80% Mullite.

Use in Abrasive Products
Kyanite and Mullite are sufficiently hard to be used as a low-level abrasive. Kyanite's heat resistance and hardness make it an excellent material for use in the manufacture of grinding wheels and cutting wheels. It is not used as the primary abrasive; however as part of the binding agent that holds the abrasive particles together in the shape of a wheel.

Expansion of Kyanite When Heated
A unique quality of Kyanite is its ability to expand significantly when heated. Depending  on temperatures, heating conditions and particle size, Kyanite can expand to up to twice its original volume when heated and is used to offset shrinkage from other materials and binders, thereby maintaining volume in the finished product.

Foundry, Refractory and Electrical Porcelains
Kyanite is a non-metallic material that retains its strength at high temperatures and therefore can be used in furnaces, kilns, incinerators and reactors. This is also used to make crucibles and moulds for casting glass and metals and for surfacing flame deflector systems.

Because of its high thermal resistance and extremely low electrical conductivity, it is extremely well suited for the manufacture of a high-refractory-strength porcelain - a porcelain that maintains its strength at very high temperatures. A familiar use of this type of porcelain is the white porcelain insulator on a spark plug.

Refractories use heat-resistant materials that constitute the linings for high-temperature furnaces and reactors and must be able to withstand high temperatures, mechanical wear, thermal shock and chemical corrosion. Kyanite and Mullite are both used extensively in both ferrous and non-ferrous foundries. The finer mesh products (200 and 325 mesh) are a critical ingredient in many mould sprays, where they are used to remove the metal casting from the mould.

Precast refractory shapes are expected to remain a growing specialty in the refractory industry. With improved quality through controlled manufacturing, their expanding use may play a key role in improving refractory lining performance and reduce maintenance costs across all industries.
Examples of precast refractory shapes include:

  • Nozzles
  • Sleeves
  • Curb Blocks
  • Roof Sections
  • Pier Blocks
  • Skimmer Blocks
  • Burner Blocks
  • Checker Wall Blocks
  • Burner Pipe Covers
  • Hearth Shapes
  • Delta Sections
  • Impact Pads
  • Burner Ports
  • Flare Tips
  • Troughs
  • Wall Panels
  • Divider Walls
  • Jambs, Lintel & Sills
  • Well Blocks
  • Flue Caps
  • End Caps
  • Safety Linings
  • Runners
  • Manway Plugs
  • Air Grid Tiles
  • Peep Sites
  • Flue Walls
  • Exhaust Ports
  • Spouts
  • Tap Blocks
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