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Electrical separation

Electrical separation . Main parameter - electrical charge. Electrical charge depends on: . A. Time of life Q t = Q 0 exp (– t /  )= Q 0 exp(–   t /  0 ). Q 0 – electrical charge at the moment of birth ( t = 0) Q t – electrical charge at time t t – time

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Electrical separation

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  1. Electrical separation

  2. Main parameter - electrical charge

  3. Electrical charge depends on: A. Time of life Qt = Q0 exp (–t/)= Q0 exp(– t/0) Q0 – electrical charge at the moment of birth (t = 0) Qt – electrical charge at time t t – time  – relaxation time  – conductivity(–1m–1)  – dielectric constant (dimensionless) 0 – electrical permeability of vacuum (8,854·10–12 C2N–1m–2).

  4. B. Relative air moisture log  = a + bc a, b – constant c – relative air moisture

  5. N - population of particles, E -intensity of electrical field, V/m, q/m -electrical charge per unit mass

  6. 1-V.S.Fomienko, NTIS, US Dep. of Commerce Report, No.JPRS-56579, 1972 lub Gupta et al., Powder technology, 75 (1993) 79-87, 2 - Lewowski, Coal Preparation Journal, 1993, 13, 97-105, 3 –unknown source , 4. CRC Handbook, 67th ed., 1986-87

  7. Force Fel acting on a charged particle in electrical field Fel = Qt E = A q E A - surface area, cm2 q - surface charge,C/cm2 E - electrical field, V/m

  8. Ways of charging (electrification) - friction (triboelectric) - ionization (ion bombardment) - induction - contact (dissimilar particles) - other

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