Ball Mill Critical Speed
Calculates the critical rotational speed of a ball mill and the recommended operating speed based on a chosen factor of the critical speed.
📖 Need the theory? Read the methodology, assumptions, and equations in the full reference guide.
1. Define Input Parameters
2. Engineering Output
Mill radius (R)
- m
- m
Critical speed (Nc)
- rpm
- rpm
Recommended operating speed (Nopt)
- rpm
- rpm
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The critical speed of a ball mill is the rotational speed at which centrifugal force balances gravitational force on the grinding media, causing it to cling to the mill wall and cease grinding. Operating below this speed ensures the media cascade and tumble, providing the impact and attrition needed for efficient size reduction. This calculation is essential for designing and operating grinding circuits in mineral processing and cement manufacturing.
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