### formula for critical speed of mill - escapade-rochepaule.fr

Rod and ball mills circuit sizing method The Cement. Mar 17 Model Input D is the mill effective inside diameter feet Model Output Nc is the critical speed in revolutions per minute Conversions ft minformation on ball mills This formula calculates the critical speed of any ball mill Most ball mills operate most efficiently between 65 and 75 of their critical Rod mill as first stage and ball ...