Aug 11, 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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Purpose, Optimization of a ball charge for ore and raw mills with objective load with a high retention time in the ball mill which also leads to over grinding. Determine the permeability of the ball charge in the 1st and 2nd compartment:.
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Primary Rod Mill followed by Secondary Ball Mill. calculate ball mill residence time The Q&A wiki. the hydraulic residence time t is given by t=V/q where V is the volume950 1350 small diameter ball mills.
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Optimization of continuous ball mills used for finish-grinding of ore by varying the L/D ratio, ball charge filling ratio, ball size and residence time The number of stresses can be characterised by the average retention time of the ground material inside the mill if the ball charge grading remains unchanged.
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