METHOD FOR DETERMINING A LIFTING ANGLE AND METHOD FOR POSITIONING A GRINDING MILL

The Purpose of the invention to provide a method for determining a lifting angle of a charge inside a grinding mill at a specific point in time and a method for positioning a grinding mill which is more accurate. Method for determining a lifting angle (±) of a charge (2) inside a mill body (1) of a grinding mill being rotatable through a drive train, the method comprises the following steps of rotating the mill body (1); determining a reference lifting angle (± r ) and a corresponding reference driving torque (M r ) of the drive train at a reference point in time; calculating a fill factor (K) for the reference point in time based on the reference lifting angle (±r) and the reference driving torque (M r ); determining a driving torque (M) of the drive train; and calculating the lifting angle (±) based on the driving torque (M) and the fill factor (K).