





Q2. A closed ball mill cyclone circuit treats 100 mtph of ore with an S.G. of 3.3. The solids concentration is 75% in the ball mill, 60% in the pump sump to the cyclone, 32% in the cyclone overflow and 80% in the cyclone underflow. Answer the following: a) Compute the flow rate of the Feed, Product and Underflow slurries over the cyclone



Ball mill circuit classification system performance is considered here first because it provides the basis for subsequent characterization of ball mill breakage efficiency. Major design and operating variables in closed circuit ball milling of a specified feed to a desired product size are summarized in Table 1.



Kolev et al (2021) –In press. Improving the energy efficiency in tumbling mills with the use of Relo grinding media (MDPI) • Lab trials conducted using a standard Bond ball mill (@ Wardell Armstrong) • Standard Bond ball mill procedures were followed –only the RELO media PSD and mass of charge adjusted to match spherical media



mesh (1.7 mm) ensuring that the ball mill will work efficiently. Coarser screens than 10 mm will cause serious losses in ball mill efficiency. Ball mill feed must never exceed 80% passing 3 mm if reasonable ball mill efficiency is expected. The practice of using ½ inch screens (trommels) is an encroachment on this limit and is perhaps the most







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crusher product % medium values match up with the mill feed 24 hours later. Understandably, as the amount of critical size fed to the mill rose, the tonnage of one of the semi-autogenous mills fell from 2000 tph to 1800 tph. 10 15 20 25 30 35 40 45 50 Weight % Medium 1600 1700 1800 1900 2000 2100 2200 2300 2400 Mill Tonnage (tph) …







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The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum 'chunk size', product size as P80 and …



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These mills typically grind ROM ore in a single stage. A large example of such a mill was converted from a single-stage milling application to a semi autogenous ball-mill-crushing circuit, and the application is well described. This refers to high-aspect AG/SAG mills. Ball Charge Motion inside a SAG Mill. With a higher density mill charge.

















e.g.: No good crushing 1000 tph delivering o-size non quality material to a mill that grinds 150 tph. Crush a quality 300 tph to give the mills every opportunity to maintain max tonnage with the required grind. Just an example, I've seen a few places crushing tonnage seems to outweigh crushing quality. Mill densities as well.







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