Direct,continuous calcing process Low waste gas temperature,providing good thermal efficiency Size grading of the raw feed material 0 to 30mm,thus no particular requirement for pre-crushing No pre-drying necessary The calcined material is already reduced in size,so that little energy has to be used for fine grinding Automatic control of the rotary kiln operation Standardised sizes up to an output of 1000 tonnes per day in one unit Simple design made of proven and reliable components No refractory brickling in the rotating part