Calcined Kaolin is broadly used in paints, plastics, coatings, paper and other industries as a reinforcing agent, extender, and filler in the formulation. Raw Kaolin raw is a mixture of clay minerals, quartz, and feldspar, where kaolinite is the main component. Raw Kaolin also known originally as China Clay was discovered in the 7th/8th centuries. Calcined kaolin is produced by heating ultrafine natural kaolin in a kiln at temperatures of 650°C to 750°C. The calcination process increases whiteness and hardness, improves electrical properties, and alters the size and shape of the kaolin particles.
Various grades of calcined kaolin are produced by varying parameters in the calcination process for example retention time in the rotary kiln, firing temperature). Further heating whitens it more and reduces reactivity while keeping abrasiveness low.
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