Ball mill - WikipediaA ball mill is a type of grinder used to grind and blend materials for use in mineral dressing . The ball mill can grind various ores and other materials either wet or dry. There are two kinds of ball mill, grate type and overfall type due to different.wet ball milling method,BALL MILL METHOD FOR DETERMINING THE DISINTEGRATION .This method determines the resistance of aggregate in flexible base material to disintegration in the . The result of this test is the Wet Ball Mill (WBM) value. 1.2.