Abstract
In order to search after the condition for the utilization of alunites as ceramic raw materials, changes of their characteristics by calcination and by various treatments were investigated.For the use as ceramic raw materials, alunites must be calcined above the volatilization temperature of SO3, up to the temperature where the internal surface area reaches the maximum. By wet ball-milling and filter-pressing on the calcined material, almost all alkalis and SO3 were extracted and the property as ceramic raw materials was found very satisfactory.
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