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a ball mill is a type of grinder used to grind and blend materials for use in mineral dressing processes, paints, pyrotechnics, ceramics and selective laser sintering. it works on the principle of impact and attrition: size reduction is done by impact as the balls drop from near the top of the shell.

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click to view5:40· if 75 percent of critical speed is considered desirable for efficient grinding in a 2.4 meter (8 foot) diameter mill, then the same will be true for a 5.0 meter (15½ foot) diameter mill.

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rod mill as first stage and ball mill sizing with the bond method. for rod mill(s) + calculation. mill % of the critical speed, % 9, mill length, m. 10, mill speed if you think the mill diameter is too high, repeat the calculation for. 2 or more rod

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a ball mill critical speed (actually ball, rod, ag or sag) is the speed at which . the formula derivation ends up as follow: critical speed is: nc. spreadsheet based simulation of closed ball milling circuits (pdf .

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· ball mills are normally operated at around 75% of critical speed, so a mill with diameter 5 metres will turn at around 14 rpm. the mill is usually divided into at least two chambers, allowing the use of different sizes of grinding media.

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