A Study of Performance of Classifier and Mill Capacity in Closed Circuit Grinding

Previously, Tanaka1) proposed a chart of a closed circuit grinding plant. The idea was based upon the assumption that the sharpness of the classifier was perfect. This fictitious condition, however, did not apply to practice.In this paper an assumption is made that the partial collection efficiency of a classifier isand on this assumption the "Charts" (Figs. 4, 5, 6 and 7) have been drawn up. By these, one can easily obtain the values of several variables, such as circulating load, cut-off size of the classifier, residue of the products, etc.Based on these "Charts" (Figs. 4, etc.) and Rittinger's Law, we have got Figs. 8, 9, etc., which show the increase of the product rate vs. circulating load and the performance of the classifier at several values of RP, l and cl.Several relations of closed circuit where n is not 1 are shown in Figs. 13, 14, 15 and 16. These showthat the capacity of the mill increases with the increase of circulating load and that reformation of the classifier at n 1.