Material’s drying and calcination are different processes, both of them are required to bring heat to materials; drying is to evaporate the wet material to fulfill the final required moisture content; calcination is to heat materials and the complex physical and chemical reactions occur and come to a certain technological requirement. After drying or calcination, the material temperature is very high, which needs cooling treatment, and the corresponding cooler must be used to cool the material to reasonable temperature.
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