Bentonite Dryer Introduction: Bentonite Dryer is specially designed to dry the wet bentonite, and it is one kind of Rotary Drum Dryer . The natural bentonite is with about 25% moisture content, and it is not suitable to be grinded into fine bentonite powder directly by the Raymond Mill. Thus the wet bentonite with moisture content about 25% needs to be reduced to be about 12% so that it is suitable to be grinded by the Raymond Mill into fine powder, usually it is 200 mesh bentonite