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SCREENING

SCREENING. Main feature of screening is size of particle. c. a. d. b. spherical particle. Irregular particle. A measure of size is usually diameter. A - histogram (frequency curve). Size distribution. B - distribution curve (cumulated frequency curve). Mechanics of screening.

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SCREENING

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  1. SCREENING

  2. Main feature of screening is size of particle c a d b spherical particle Irregular particle A measure of size is usually diameter

  3. A - histogram (frequency curve) Size distribution

  4. B - distribution curve (cumulated frequency curve)

  5. Mechanics of screening P - inertia G- gravity T - friction

  6. Physics of screening sliding

  7. Physics of screening casting

  8. Movevent of particle with casting (ejection)

  9. Probability of screening Pscrening = Pz Ps Pr H - thickness of particles on screen dr - screen aperture

  10. Kinetics of screening Generally: vpi= –di /dt = ki i,  - velocity of screening l - content of a fraction in the product on the screen i,t = i exp (–ki t) k - rate constant, t - time For instance Malewski, 1990: k0.5 -rate constant for di = dt dt -screen aperture d - constant di - particle size k0,5 = 3600 VBWsCds/Qo, (for meaning of symbols see „Podstawy mineralugii, 2001”)

  11. Particle size analysis

  12. Basic screen types and their classsification (Kelly and Spootiswood)

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