SPECIFICATION SHEET • SI METRIC
CAT: PROCESS

Circulating-Load Ratio (CLR)

Calculate grinding circuit circulating load ratio from ball mill feed, cyclone feed, overflow, and underflow sizing/assays.

💡 Engineering Knowledge PrimerCirculating Load Ratio (CLR) compares the mass flow of recycled hydrocyclone underflow returned to a ball mill against fresh feed rate. Optimal grinding circuits operate at 200%–350% CLR; lower values cause overgrinding, while higher values risk cyclone rope discharge and mill overload.
OPERATING LIMITS — Circuit-ratio calculation: validate against the full circuit sample and classifier balance.
INPUT DESIGN PARAMETERS (SI)
%
%
%
CALCULATED SPECIFICATION OUTPUT
Circulating Load Ratio (CLR)
✨
165 %
Mill Load Multiplier2.65 x Fresh Feed

Technical Methodology & Engineering Principles

GOVERNING EQUATION
CLR = (Overflow % - Mill Discharge %) / (Mill Discharge % - Underflow %) × 100%
Assumptions & Scope

Closed-circuit grinding steady-state mass equilibrium.

Operating Range & Boundary

Use finite, physically meaningful inputs within the stated operating assumptions.