AN ANALYSIS OF THE CLOSED-CIRCUIT GRINDING SYSTEM WITH A SEMI-IDEAL CLASSIFIER

Abstract

As a first step towards a more reasonable description of the steady-state characteristics of closed-circuit grinding systems, a grinding system with a semi-ideal classifier-whose performance curve consists of the partition phenomenon towards the coarse products and ideal classification in other respects-is analyzed. The aim of this analysis is to clarify the effects of classifier performance on the steady-state flow-rate and also on the particle size distribution of fine products. Based on the above analysis, the relationship between the total flow-rate of materials through the mill and the steady-state flow rate or the particle size distribution of the fine products is estimated and compared with experience in industrial-scale ball mill systems. Based on all the above investigations, some principles in the system design of closed-circuit grinding processes are suggested.