Influence of different dry milling processes on the properties of an ...
After 60 h milling in Pulverisette 0, the γ s d decreased from 164 to 116 mJ/m 2 in contrast with of 148 and 159 obtained with ball mill and air jet mill, respectively. The simultaneous decreases in the specific surface area and of the γ s d can be interpreted by a destruction of channels forming the attapulgite structure.