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Ball mill is the key equipment for grinding after the crush process, and it is widely used in the manufacture industries, such as cement, silicate, new building material, refractory material, fertilizer, ferrous metal, nonferrous metal and glass ceramics, it also can be used for the dry and wet grinding for all kinds of ores and other grind-able materials.Ball grinding mill is a horizontal type and tubular running device, has two chambers. Its outside runs along the gear.The material enters spirally and evenly to the first chamber of the milling machine along the input material hollow axis by input material device. In this chamber, there is a ladder scale board or ripple scale board, and different specification steel balls are installed on the scale board, when the barrel body rotates and then produces centrifugal force, at this time, the steel ball is carried to some height and falls to make the material grinding and striking.After grinded coarsely in the first chamber, the material then enters into the second chamber for regrinding with the steel ball and scale board. In the end, the powder is discharged by output material board and the end products are completed.Wet grinding efficiency is higher, and operating conditions is better than dry grinding, the coal industry use more of this process. One of the problems involved in wet coal grinding is the slurry viscosity. After milling, the slurry viscosity is higher, the efficiency of ball mill is slower. When the mud weight and size adapt to viscosity and density of the grinding media, the ball mill grinding can get the best results.In the past, dry grinding and wet grinding was one pair of mutually exclusive process method. Today, thanks to the increase of energy milling process, and environmental pollution problems highlighted. Making dry grinding process has become a competitive mode of production, and in the past only for use in cast iron enamel industry in dry grinding technology, has become a kind of ceramic blanks preparation of the commonly used methods.screw classifier: http://www.fte-china.com/pro/classifiers.html