Dense Medium Separation Ep Calculator
Mineral processing & coal beneficiation: Calculate cut point density (ρ₅₀), Ecart Probable Moyen (Ep), imperfection index, and Tromp partition sharpness.
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Frequently Asked Questions
What is Ecart Probable (Ep) in Dense Medium Separation?
Ecart Probable (Ep) is the standard international metric for separation sharpness in gravity concentration. Calculated as (ρ₇₅ - ρ₂₅) / 2 from the Tromp partition curve, an ideal separation has Ep = 0, whereas modern heavy-media cyclones achieve Ep values between 0.020 and 0.045 g/cm³.
Why does a dense medium cyclone cut at a higher density than the feed medium?
Due to centrifugal acceleration inside the cyclone, fine heavy media particles (magnetite or ferrosilicon) concentrate outward toward the underflow cone. This creates a denser internal fluid core than the incoming feed slurry, causing the effective separation cut density (ρ₅₀) to be 0.05 to 0.15 g/cm³ higher than the feed medium density.
What is Near-Gravity Material (NGM) and why is it dangerous?
Near-Gravity Material is the percentage of raw ore with a specific gravity within ±0.10 g/cm³ of the operating separation cut point. If NGM is high (>15–20%), the particles have almost zero buoyant driving force and take longer to separate, leading to misplaced material and extreme sensitivity to media density fluctuations.