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Mobile crushers in Durham - johnsimpsoncivils.com- roll crusher separatingroll crusher separator ,For heavy-duty mobile crusher, ... • Provision for overband magnetic separator ... • Units designed to be readily transported on UK and EC standard ampli roll unitsConstruction Planning, Equipment, CHAPTER AGGREGATE …be fed to a roll crusher is directly proportional to the diameter of the rolls. If the feed contains stones that are too large, the rolls will not grip the material