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A series of grinding tests were made to investigate the effects of additive amount of grinding aid and feeding rate of cement on the performance of an open circuit vibrating mill during fine grinding of cement. The determination of grinding characteristics were performed, as shown in Table I and II, by varying the additive amount of grinding aid (Ca=0∼0.08%) and the feeding rate of cement (F=10∼44kg/h). At the same time, the mean residence time in the mill, ta, mixing characteristics, σ and E, and hold-up of powder, H, were determined as shown in Table III and IV, by using a small quantity of tracer (barium sulfate powder).The delta response of tracer concentration was found to be represented well by a logarithmic-normal distribution even in the case with grinding aid, as shown in Fig. 2. It was also found that the addition of grinding aid improves grinding efficiencies, enables to make extremely fine cements and improves size distribution curves of products as shown in Table I and II. With the increase of the additive amount of grinding aid Ca or the feeding rate of cement F, the mean staying time ta becomes shorter and the mixing coefficient E becomes larger. The hold-up H decreases with increasing the addition of grinding aid Ca and with decreasing the feeding rate of cement F.

The Effect of Grinding Aid in Fine Grinding of Cement in Continuous Vibrating Ball Mills