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a mill is a device that breaks solid materials into smaller pieces by grinding crushing or cutting. such comminution is an important unit operation in many processes. there are many different types of mills and many types of materials processed in them. . attrition between grinding balls and ore particles causes grinding of finer
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crushing a form of comminution one of the unit operations of mineral processing. in the field of extractive metallurgy mineral processing also known as ore dressing is the for instance stamp mills were used in samarkand as early as 973. crushing is normally carried out on "run of mine" ore while grinding (normally