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Glossary

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The Group

Glossary

Glossary by alphabetic list :

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Glossary by branch :

  • Abrasives

    substances used for wearing or polishing.

  • Alumina

    Aluminum oxide (Al2O3).

  • Andalusite

    a natural alumino-silicate mineral, transforming into mullite when fired. Usually contains around 60 % alumina.

  • Calcined clays / chamottes

    calcined clays, usually calcined in a rotary kiln, at high temperature (1400 – 1600ºC), and which transform into mullite and glass. C-E Minerals is a world leader in calcined clays.

  • Chromite

    Chrome ore, mined mostly in RSA. Widely used in the foundry industry for its high refractoriness.

  • Engobes

    clay-type raw materials that are projected onto tiles before baking. They enhance tile color and surface.

  • Feldspar

    natural mineral used for the vitrification of ceramic bodies in porcelain and earthenware manufacturing.

  • Fused alumina, brown

    fused in electric arc furnaces. Main raw material is a special (abrasive) grade of bauxite. During the fusion other oxides included in the bauxite (Fe, Ti, Si) are reduced to the desired level. Production can be described as fusing and refining process of bauxite.

  • Fused alumina, special

    by alloying with other elements (e.g. TiO2 and/or Cr2O3) during the fusion of alumina special fused aluminum oxides like the Pink or Ruby type are produced.

  • Fused alumina, white

    fused in electric arc furnaces. During fusion of abrasive grade alumina the physics of aluminum oxide are changed (higher density and different crystal structure and size).

  • Halloysite

    very white, transluscent clay.

  • Magnesite

    an important component of basic refractories. Usually obtained by calcining magnesium carbonate. Can also be fused.

  • Mullite

    the main component of acid refractories = highly refractory alumino-silicate, not found in nature except in traces, but obtained from firing various raw materials: clays, andalusite, kyanite, etc.

  • Refractories

    materials that resist high temperatures. Depending on the application, they cab also bear heavy weights or resist.

  • Refractory grade bauxite

    a natural mineral association, alumina rich, calcined at high temperature. Main producer: China, also Guyana, Brazil.

  • Silicon carbide

    is a synthetic product obtained by running an electric current through a mixture of silica (sand) and petroleum coke (Acheson process). SiC is formed by heat then ground into various grades. A high temperature application product (1,350 - 1,700ºC), SiC offers high mechanical resistance; it is also an excellent heat conductor and resists oxidation well. It therefore increases furnace capacity by reducing product thickness, allows fast baking methods and provides product lifespan. In short, it enables customers to improve productivity. It is notably used in kiln furniture for porcelain.

  • Tabular alumina

    a high quality alumina, requiring a special manufacturing process.

  • White or brown fused alumina (Fused aluminium oxide, fused bauxite)

    products obtained by fusing alumina (white) or bauxite (brown) in an electric arc furnace. During fusion, the physics of aluminum oxide are changed (higher density and different crystal structure and size).

  • Zircon

    Zircon is sold in different forms such as zircon sand or flour. Fused zircon is obtained by melting zircon sand in an electric arc furnace and takes the form of precisely calibrated grains and powders with sizes ranging from several millimeters down to less than a micron. Its unique properties mean it is used as a high value-added raw material in a wide range of applications, particularly on the refractories, friction and technical ceramics markets.

Imerys is based in over 50 countries and has 250 industrial sites.

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