The materials whose moisture content is below 6% can be grinded by mill. There is no much influence when the moisture is not more than 10%, but when it is up to 10% and more, the capacity of the grinding mill will be greatly effected. If the moisture is up to 15%, the materials are not suitable to be grinded any more. If you want to grind thus materials with more than 15% moisture content, there will be some problems occurring, for example, vibration of the main body and separator, instability of the blower electric current, materials sticking, and so on. So, when you choose a suitable grinding plant, the moisture content is an essential element to consider.