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Praters air classifying mills operates by using the combination of two-stage closed circuit grindingmilling with an interstage air classifier all in one convenient unit.The internal air classifier continuously recirculates particles that are larger than desired back into the grinding zone ensuring an optimal final product particle size.
There are two basic types of ball grinding systems open circuit and closed circuit.In the open circuit system, the mill product has the fineness required for the next stage of the process.In the closed-circuit system, the mill product is classified in a separator in a fine fraction that is then taken to the next stage, and a thick fraction.
Operation of closed circuit cement grinding ball mil.Closedcircuit systems the efficiency of the early stages of grinding in a ball mill is much greater than that for formation of ultrafine particles so ball mills operate most efficiently by making a coarse product the fine fractions of this then being separated and the coarse part being returned to the mill inlet.
However, the effect of each is difficult to quantify in practice as these two parameters are usually interrelated.Based on experience acquired over the years and the investigative work conducted by f.Bond, it was established that the optimum circulating load for a closed ball mill cyclone circuit.