The author determined the fineness of cement clinker being charged continuously to a concentra-type-mill, whose fine grinding room was devided into five segmental spaces by partition boards parallel to the axis.
The results were as follows:
1) The plots of the 0.088mm oversize values vs. the distances from the mill entrance showed that particle moving velocity through the mill was never homogeneous, but the mixing also in the opposite direction to the exit took place, especially in the vicinity of the entrance or just behind the screens.
2) Rittinger's law was approximately proved to be appliable assuming the moving rate of powder was nearly constant.
3) The exponential law was valid to the particle-distribution in the concentra mill, which was determined by means of a Wagner Turbidimeter.
The grinding-rate equation was derivedd by partial differentiation of the empirical exponential equation: from which the author described the procedure to estimate the most effective grinding condition.
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