To replace the ball mill liner, the first step is to remove the old liner and clean the surface of the mill to prepare for the new liner installation. This typically involves using heavy machinery, such as a crane or forklift, to lift the liner out of the mill. Once the old liner is removed, the new liner can be installed by carefully positioning it in the mill and securing it in place. This may involve using bolts or other fastening devices to hold the liner in place. It is important to ensure that the new liner is properly aligned and seated to ensure optimal performance of the mill. Additionally, it is important to follow all safety precautions and guidelines when removing and installing a ball mill liner to prevent injury or damage to equipment.