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Ball and tube mills A ball mill is a pulverizer that consists of a horizontal rotating cylinder up to three diameters in length containing a charge of tumbling or cascading steel balls pebbles or rods A tube mill is a revolving cylinder of up to five diameters in length used for fine pulverization of ore rock and other such materials

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Ball and tube mills were the mainstay of the industry At present these mills are used for grinding difficult coals as explained in Section 13 2 1 Construction Ball and tube mills are slow speed 15 35 rpm horizontal cylindrical drums with coal entry on one or both sides and external classifiers

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