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Abstract-A model is presented for the simulation of rotary drum eddy-current separators. The most important part of the model is an improved first-order differential equation for the magnetic moment of nonferrous particles in the field of the separator magnets. The model also includes the mechanical interaction between the particles and the transportation belt, as well as aerodynamic forces. The resulting particle trajectories are compared to experimental data, both on the basis of full trajectories and statistically, in terms of the calculated and measured throw.