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The Cement Grinding Office
The measurement of the ball charge volume load (or filling degree) is essential to maintain the absorbed power of the mill and consequently the mill production.
The most commun way to evaluate the filling degree is the measurement of the free height inside the mill (vertical distance between the top of the charge and the lining in the mill axis).
Normally, it is better to take the height in 3 points (chamber inlet, middle of the chamber and chamber outlet) and make an average.
Other two methods are also used, the number of visible lining plates and the measurement of the central screen or trunnion and its distance with the top of the balls.
The three calculators hereafter allow to know the filling degree in function of these 3 methods of measurement:
- For monochamber mill:
- For 2 chambers mill:
- For 3 chambers mill:
- If you prefer to see an explanation before, go there: