In order to optimise the performance of a ball mill, is there any suggested air velocity through the mill that we should use? Our cement plant has some very old ball mills. One in particular is a 4.572m x 13.9m two compartment mill, closed-circuit, with a Sepax separator 2S-375 separator. The separator and mill are vented by the same dust collector. We are currently running a high mill outlet ventilation on the mill, greater than -4" W.C. What is an acceptable mill ventilation static pressure range for this type mill circuit?

1.5 to 2 m/s air velocity through the mill is normal for a closed circuit mill.

Is there any literature about the influence of triethanolamine addition in the cement milling process, related with the final characteristics of cement? Are there a optimum rate of triethanolamine addition in the cement milling process? Can I cause some damage in the final cement characteristics if we use a triethanolamine superdosage?

There are many literature references to the effects of grinding aids and cement conditioners. The optimum rate of addition needs to be determined during a series of trials on the mill. The trials need to be designed to ensure there is no detrimental effects on the final cement characteristics.