Closed circuit cement mill circuit. Cement mill open closed circuit.Cement mill open closed circuitour purpose and belief lm heavy industry is committed to provide the global customers with the firstclass products and superior service, striving to maximize and.Jul 27, 2015 Simple 1 “Closed Circuit” Ball Mill with Cyclone Grinding Circuit Flowsheet. This is the path that the ore takes in this circuit. The ore comes from the fine ore storage area to be added to the mill. Again it is ground but this time the ground material is pumped to a classifier to be classified by size.