MetPro

Crusher Sizing Calculator - Bond Third Law

Crushing stage duty from Bond's third law: specific energy, required and installed motor power, reduction ratio and recommended CSS range by crusher type.

Methodology & references

This calculator estimates the duty of a single crushing stage with Bond’s third law: W = 10·CWi·(1/√P80 − 1/√F80) with the crushing work index CWi (typically 5–25 kWh/t), giving specific energy, net power at the shell and a recommended installed motor power with a 15% margin. It also reports the reduction ratio and a recommended closed-side-setting range tied to the product top size and the selected crusher type.

This is a scoping-level tool for early flowsheet work. When you need product size distributions rather than a duty estimate, use the population-balance Crusher PSD Simulator, which models selection, breakage and the CSS/OSS capture geometry explicitly.

References

• Bond, F.C. (1952). The Third Theory of Comminution. Trans. AIME 193, 484–494.
• Wills, B.A. & Finch, J.A. (2016). Wills' Mineral Processing Technology, 8th ed., Ch. 6 (Crushers).

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