This formula calculates the critical speed of any ball mill. Most ball mills operate most efficiently between 65% and 75% of their critical speed. Photo of a 10 Ft diameter by 32 Ft long ball mill in a Cement Plant.
as a supplemental fuel to coal. Only one California plant utilizes gas as a primary kiln fuel. This is a relatively small plant that produces white cement. The remainder of the natural gas usage is associated with boiler and machine drive end uses. Figure 21 Cement Industry End Use Electricity Consumption Process Machine Drive 81% Process Heating 10%