ToolnozaInputs and measurement basis
Measure fresh feed and classifier return over the same steady period, both as dry-solids tonnes per hour. Enter the values and distinguish circulating load relative to fresh feed from recycle fraction of total mill feed.
Fresh dry solids feed (t/h); Returned dry solids (t/h).
Formula and calculation
CL (%) = 100R/F; M = F + R; recycle (%) = 100R/(F + R).
Calculate grinding-circuit circulating load, total mill feed and the recycled share from dry-solids flow rates.
Worked example
F = 100 t/h; R = 250 t/h → CL = 250%; M = 350 t/h; recycle = 71.43%.
How to interpret the result
A circulating load above 100% is possible: the return stream can exceed fresh feed. In the example, the mill processes 3.5 tonnes for every tonne of fresh feed.
This ratio does not measure classification efficiency or energy efficiency. Track product size, classifier separation and mill power before changing operating conditions.
Assumptions and limits
Steady-state dry-solids balance only. Do not mix wet slurry mass, dry solids or volumetric flow. Changes in circuit inventory invalidate a simple instantaneous balance.
Frequently asked questions
Is circulating load the same as recycle percentage? No. CL uses fresh feed as its denominator; recycle percentage uses total mill feed. Always name the denominator when comparing reports.