Abstract
A brief presentation is made of the raw materials for alumina ceramics. The important source is the alumina trihydrate resulting from the Bayer process. Purification of the Bayer aluminate liquor to minimise organics, iron oxide and silica, reduction of sodium oxide content, special conditions of precipitation and calcination and fine grinding of the calcined material lead to the production of various grades of alumina. Other processes involve acidification of the aluminate liquor followed by drying and calcination or treatment of aluminium amalgam with water to precipitate aluminium hydroxide. Typical properties and applications of alumina ceramics are discussed. A survey of the world scene is made and the situation in India is briefly reviewed. The importance of introducing collaborative efforts to accelerate activities in this field in India is stressed.
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