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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 processThere are many different types of mills and many types of materials processed in them Historically mills were powered by hand eg via a hand crank working animal eg horse mill wind or water...

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In an instant the material is carried into the grate or cage assembly where shear forces reduce the larger particles and carry them across the grate surface grinding the particles into a controlled gradation Openings in the grates and cage assemblies allow particles to escape the mill once they are reduced to the appropriate size...

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