... according to different expelling mine. To use the Ball Mill, the material to be ground is loaded ... of several hours. Quite simply, the longer the Ball Mill runs, the finer the powder will be. ... is, and the time how long the Ball Mill runs. Our Ball Mills have been used to grind glass, ... various chemicals, and make Black Powder. Model: MQG Series Company Name: Vipeak Heavy Industry Machinery Co., Ltd ...