The motion of particles in a jig separator is investigated numerically. The motion of particles is expressed by the BBO-type equation. Three-dimensional flow is simulated by the SIMPLE algorithm. The contact forces among particles are calculated by a discrete element method (DEM) extended to particles of different sizes. The results of simulation show that particles with the same settling velocities and different diameters can also be separated. To analyze the motion of particles in the jig, an equation for the response time of a particle that included added mass, gravity, and drag forces is derived.

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