Magnetic separators introduction
Magnetic separation – Magnetic attraction force (Fm)
Fm = V x X x H x grad H
V = particle volume (determined by process)
X = magnetic susceptibility (see table below)
H = magnetic field (created by the magnet system design) in mT
(milliTesla) or kG (kiloGauss) 1 kG = 100 mT = 0.1 T
grad H = Magnetic field gradient (created by the magnet system design) in mT/m
Magnetic separation – Competing forces
• Gravitational force (Fg) is determined by particle size and density.
• Drag force (hydrodynamic, aerodynamic), Fd, is determined by particle size, shape, fluid density, viscosity, turbidity and velocity.
• Centripetal force (Fc).
• Electrostatic forces etc.