Flotation Cell Residence Time Calculator
Calculate the nominal slurry residence time in a flotation cell or bank — accounting for operating level, gas holdup and parallel trains — or solve the effective volume needed for a target time.
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Calculated results
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- Enter cell volume, cells in series and slurry flow.
Before you rely on this: First-pass guide only. Verify safety-critical or regulated work against the relevant standards, your project requirements and a qualified professional.
How to use this calculator
- Enter the cell geometric volume and the number of cells in series per train.
- Optionally set the operating volume fraction and gas holdup to get the effective (slurry-occupied) volume.
- Enter the total slurry flow and the number of active parallel trains to read nominal per-cell and per-bank residence time.
How it works
Effective volume per cell = geometric volume × operating fraction × (1 − gas holdup). The bank effective volume is that multiplied by the cells in series. Flow per train = total flow ÷ active parallel trains, and nominal residence time (minutes) = effective volume ÷ flow per train × 60.
Residence time is a hydraulic quantity only. It does not predict metallurgical recovery — flotation kinetics, bubble surface area flux, froth behaviour, mixing and mineralogy all matter. The optional effectiveness factor is a user-entered sensitivity multiplier, never a hidden default.
Worked example
Two parallel trains of six 100 m³ cells at 1,200 m³/h. At 90% operating volume and 12% gas holdup, effective volume per cell = 100 × 0.9 × 0.88 = 79.2 m³, so a six-cell bank holds 475.2 m³ of slurry. With two active trains the flow per train is 600 m³/h, giving a nominal bank residence time of 475.2 ÷ 600 × 60 = 47.52 minutes.
Common mistakes
- Using geometric volume without the operating-level and gas-holdup deductions — that overstates the true residence time.
- Forgetting to divide the plant flow between parallel trains.
- Reading residence time as recovery. It sizes the opportunity for flotation, it does not guarantee it.
Frequently asked questions
Should I use pulp flow or including-air volume?
Use the actual slurry (pulp) volumetric flow at operating conditions, and reduce the cell volume by the gas holdup so both refer to the slurry phase.
Why is my residence time lower than the design figure?
Bypassed or unavailable cells, higher throughput, or a larger gas holdup all cut effective residence time. Enter only the active cells and the real operating flow.
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Cite this tool
Zerdly. (2026). Flotation Cell Residence Time Calculator. Retrieved from https://www.zerdly.com/tools/flotation-cell-residence-time-calculator/
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.