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In this example the OWi of the SAG mill was found to be 30% higher than the ball mill thus suggesting that the SAG mill was less efficient than the ball mill The apparent inefficiency of SAG mills when using Bond analysis is widely understood to be due to the difference in the slopes of the size distributions In contrast when the SSE75 was calculated it showed the SAG mill consumed 20%

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Rod mills are less common than ball mills for grinding minerals The rods used in the mill usually a high carbon steel can vary in both the length and the diameter However the smaller the rods the larger is the total surface area and hence the greater the grinding efficiency

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· Schellinger s calculated ball mill efficiency in dry or wet ball mill grinding ranges between 10% and 19% with the higher figure occurring at the optimal mill loading In terms of the Brace and Walsh surface free energy of quartz his results give a ball mill efficiency that is less than %

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