Calcined Clay or Refractory clay is obtained by Calcining (heating) superior grade Clay at high temperature (from 850o C to 1600o C).
This removes moisture and volatiles which thereby increases the Alumina content.
Compared to an Alumina content of about 30% to 40% in raw Clay, Calcined Clay has an Alumina content of 40% to 60%.
The Calcination is carried out in Rotary Kilns at different temperature ranging from 850o C to 1600o C depending upon customers application.
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