CM 335 Lesson _3--CPEM Chapter 14-Screens

CM 335 Lesson _3--CPEM Chapter 14-Screens - Authors Robert...

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9/22/2008 1 A th R b t L P if Cliff d J Authors: Robert L. Peurifoy, Clifford J. Schexnayder, Aviad Shapira Instructor: Dustin Olson, MBA Screens are use to: ¾ Separate material into i l i particle size ranges. ® To scalp off oversize rock ° To screen out fines. The screening process is based upon the premise that: ° Particle sizes smaller than the screen cloth opening size will pass through the screen. ¾ Oversize pieces will be retained on the screen.
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9/22/2008 2 Screens consists of 2, 3, or 4 decks (layers) of open mesh cloth mounted one above the other in a rectangula r box. The term “mesh” refers to the number of openings per lineal inch. To count the number of openings to an inch, measure from the center of a wire to a point one inch distance The term “mesh” refers to the number of openings per lineal in. Clear opening or “space” is the distance between the inside edges of two parallel wires.
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9/22/2008 3 These screen openings are the most commonly accepted in the industry the industry. Flat top cloth is used as a subscreen which supports a finer wire cloth. Capacity is the rate in tons per hr that 1 sf of screen produces (passes) of the desired size.
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