VRM vs Ball Mill for Cement Grinding - Page 1 of 1 - International .VRM vs Ball Mill for Cement Grinding. Good Days! Gentlemen,. Anybody in this forum who have had some practical/extensive experience on Vertical Roller Mill being used for cement grinding? We are planning to put up a new cement grinding plant using Vertical Roller Mill(300-350 – TPH) and before implementing the.ball mills in working in cement,The cement mill - Understanding CementCement clinker is usually ground using a ball mill. This is essentially a large rotating drum containing grinding media - normally steel balls. As the drum rotates, the motion of the balls crushes the clinker. The drum rotates approximately once every couple of seconds. The drum is generally divided into two or three chambers,.