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A crusher is a machine designed to reduce large rocks into smaller rocks, gravel, sand or rock dust.. Crushers may be used to reduce the size, or change the form, of waste materials so they can be more easily disposed of or recycled, or to reduce the size of a solid mix of raw materials (as in rock ore), so that pieces of different composition can be differentiated.
Crushed stone or angular rock is a form of construction aggregate, typically produced by mining a suitable rock deposit and breaking the removed rock down to the desired size using crushers. It is distinct from naturally occurring gravel , which is produced by natural processes of weathering and erosion and typically has a more rounded shape.
Large road-portable plants can crush concrete and asphalt rubble at 600 tons per hour. These systems normally include a side discharge conveyor, a screening plant, and a return conveyor from the screen back to the crusher for re-crushing large chunks. Compact, self-contained crushers can crush up to 150 tons per hour and fit into tighter areas.
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The basic anatomy of a millstone. This is a runner stone; a bedstone would not have the "Spanish Cross" into which the supporting millrind fits.. Millstones or mill stones are stones used in gristmills, used for triturating, crushing or, more specifically, grinding wheat or other grains.
From January 2008 to December 2012, if you bought shares in companies when Ronald A. Williams joined the board, and sold them when he left, you would have a 5.1 percent return on your investment, compared to a -2.8 percent return from the S&P 500.
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A horse-mill consists of a circular trough made of stone, in which is set either one or two large stone wheels called "runners". [8] At the center is a pivot point or "nut". [ 8 ] A horse is harnessed to the outside of the wheel, and driven in a circle, slowly grinding the apples to a pulpy mass called pommage. [ 8 ]
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