11
Ceramic materials are inorganic, non-metallic materials and things made from them. They
may be crystalline or partly crystalline. They are formed by the action of heat and subsequent
cooling. Clay was one of the earliest materials used to produce ceramics, but many different
ceramic materials are now used in domestic, industrial and building products.
Traditional ceramic raw materials include clay minerals such as kaolinite, more recent
materials include aluminum oxide, more commonly known as alumina. The modern ceramic
materials, which are classified as advanced ceramics, include silicon carbide and tungsten carbide.
Both are valued for their abrasion resistance, and hence find use in applications such as the wear
plates of crushing equipment in mining operations. Advanced ceramics are also used in the
medicine, electrical and electronics industries.
In art history, ceramics and ceramic art mean art objects such as figures, tiles, and tableware
made from clay and other raw materials by the process of pottery. Some ceramic products are
regarded as fine art, while others are regarded as decorative, industrial or applied art objects, or as
artifacts in archaeology. They may be made by one individual or in a factory where a group of
people design, make and decorate the ware. Decorative ceramics are sometimes called "art
pottery".
The main product produced from clay in KCL is kaolin. Kaolin is named after the hill in
China (Kao-ling) where it was first mined, for many years before its discovery in Europe
(Cornwall, England) in 1745 by William Cook worthy who was looking for a source of material
to produce white china wares
China clay (Kaolin) consisting dominantly of kaolinite is one of the most sophisticated
industrial minerals with a host of applications, viz., in ceramics, refectories, paper coating, filler
for rubber, insecticides, cement, paint, textile, fertilizers and other including abrasives, asbestos
products, fiber glass, chemicals, cosmetics, pharmaceuticals, electrical wares, foundry and glass.
Kaolin is a native hydrated aluminum silicate and is classified as an inorganic. It is used as an
absorbent, skin protectant, slip modifier as well as an opacifying, building and anti- caking agent.
It is also known as below Alba, china clay and koalite. The term kaolin is now variously used as a
clay- mineral group, a rock term (consisting of more than one minerals) an industrial mineral
commodity, and interchangeably with the term china clay.
IMERYS Table ware mines the world’s largest deposit of kaolin located in south west of
England, France, New Zealand and it is from here that some of highest quality kaolin’s are
produced. This kaolin’s have exceptional ceramic properties such as outstanding whiteness and
mechanical strength which are of particular importance to the table ware industry.
Kaolin has been mined in France, England, Germany, Bohemia, and in the United States,
where the best-known deposits are in the south-eastern states. Approximately 40% of the kaolin
produced is used in the filling and coating of paper.