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Refractory clay or Calcined Clay is obtained by calcining (heating) superior-grade clay at high temperatures from 850 to 1600 Celsius. This process removes moisture and volatiles as well as increases the alumina content. It has a higher alumina content of 40% to 60%, whereas raw clay has an alumina content of 30% to 40%. The Calcination is carried out in rotary kilns at different temperatures ranging from 850 to 1600 Celsius, depending upon the customer’s application.