Primary jaw crushers typically operate in open circuit under dry conditions. Depending on the size reduction required, the primary jaw crushers are followed by secondary and tertiary crushing. The last crusher in the line of operation operates in closed circuit. That is, the crushed product is screened and the oversize returned to the crusher for further size reduction while the undersize is accepted as the product. Flow sheets showing two such set-ups are shown in Figs. 3.1 and
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Theserod and ball mills may be equipped with either herringbone or single helical gears. These are not recommended for Preliminator, Ballpeb or Compeb mills because the heat generated during dry grinding results in expansion problems
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