Abstract
A theoretical treatment of the average particle diameter evolution versus time in a fluidized bed calciner of uranyl nitrate is developed. This evolution is the result of two independent mechanisms: growth and attrition. It has been verified that attrition occurs only during particle formation, becoming negligible in completely calcined particles. The validity of this theory has been demonstrated in tests carried out in a pilot plant reactor of 20 cm diameter, by studying the influence of the operating parameters on both mechanisms.
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