# Ball Mill Retention Time Formula

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11/08/2010· Re: MATERIAL RETENTION TIME IN A BALL MILL & VRM. You could do that by measuring the material flowrate Q[tons/h] through the mill as well as the quantity M[tons] of material that accumulates within the mill. The retention time, also called residence time, is the ratio (M/Q) [h] .

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on a century or more, ball mill systems were used for all three grinding stages , A producer will work out the correct proportion and type of sulphate to be used , As the retention time in ball mills is 20 to 30 times greater than in vertical roller. Contact

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## Bond Work Index Formula-Equation

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