الكرة مطحنة الكفاءة الكرة معادلة الكفاءة مطحنة. الكرة معادلة الكفاءة مطحنة. Mill (grinding) Wikipedia. A mill is a device that breaks solid materials into smaller pieces by grinding, crushing, or cutting . predictions for ball mills typically use the following form of the Bond equation: Rod mills are less common than ball mills for ...