Wet Ball Milling Vs Dry Ball Milling Orbis Machinery, LLC. Jun 27, 2019 In the production of ethanol, wet ball milling is the process used, because of its versatile process It produces more products than dry ball milling, but in terms of efficiency, capital, and operating cost, most ethanol plants in the USA prefer to use dry ball milling process In other words, dry ball milling is cost ...