Circulating Load Calculation Formula - 911 MetallurgistSep 10, 2017 . Here is a formula that allows you to calculate the circulating load ratio around a ball mill and hydrocylone as part of a grinding circuit. For example your ball mill is in closed circuit with a set of cyclones. The grinding mill receives crushed ore feed. The pulp densities around your cyclone are sampled and.ball mill cyclone,Cyclone Monitoring System Improves - CiDRAKennecott Utah Copper's (KUC) Cop- perton Concentrator has four grinding lines each consisting of one semi-auto- genous SAG mill feeding two ball mills in a closed circuit with a hydrocyclone battery (See Figure 1). The aim of the ball mill/cyclone circuit is to produce the optimum flotation feed particle size.