| 21. | First, the alloy materials are combined in a ball mill and ground to a fine powder.
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| 22. | However, the grinding action is poor, and the product is often re-ground in a ball mill.
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| 23. | SAG mills are characterized by their large diameter and short length as compared to ball mills.
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| 24. | A new rod mill was added in 1995, and a new grinding ball mill was installed in 1996.
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| 25. | Unlike ball mills, feed to the mill must be regular and uninterrupted; otherwise damaging resonant vibration sets in.
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| 26. | These ingredients are processed in a ball mill, basically a spinning drum with non-sparking ceramic or lead balls.
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| 27. | The floats are sent to an Ersel ball mill operating in closed circuit with a double-deck sizing screen.
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| 28. | The Ball Mill by example it was an prototype of highly sophisticated design and it was not proven.
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| 29. | However the ball mill was unable to cope with the high volumes of ore in the early 1940s.
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| 30. | This gives good cement performance, and reduces energy consumption by 20-40 % compared with a standard ball mill system.
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