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Published byArthur Rose Modified over 8 years ago
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SCREENING
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Main feature of screening is size of particle spherical particleIrregular particle d a b c A measure of size is usually diameter
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Size distribution A - histogram (frequency curve)
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B - distribution curve (cumulated frequency curve)
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Mechanics of screening P - inertia G- gravity T - friction
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Physics of screening sliding
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Physics of screeningcasting
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Movevent of particle with casting (ejection)
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Probability of screening P screning = P z P s P r H - thickness of particles on screen d r - screen aperture
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Kinetics of screening i,t = i exp (–k i t) v p i = –d i /dt = k i i, For instance Malewski, 1990: Generally: - velocity of screening k - rate constant, t - time k 0,5 = 3600 VBW sCd s /Q o, (for meaning of symbols see „Podstawy mineralugii, 2001”) - content of a fraction in the product on the screen d t -screen aperture - constant d i - particle size k 0.5 -rate constant for d i = d t
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Particle size analysis
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Basic screen types and their classsification (Kelly and Spootiswood)
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