Untersuchungen zur Weiterentwicklung der Wirbelstrom-Sortiertechnik

Translated title of the contribution: Research into further development of eddy current separation technique

Georg Doninger

Research output: ThesisDoctoral Thesis


A literature and patent research regarding basics of eddy current separation is performed at first. It includes typical parameters regarding the machine itself or the input material. Futhermore, different types of horizontal drum separators are presented. Subsequently, a model for calculating the trajectories of electrically conductive particles by using finite element method is described. This model should be used afterwards for optimization of an existing eccentric drum eddy current separator. After calculating and validating the magnetic system of this magnetic drum, a dynamic model for calculating the electrodynamic forces and torques on test pieces with defined geometry and conductivity is developed, if they are exposed to the rotating magnet drum. The electrodynamic forces and torques are used for solving the equation of motion and for visualization of the trajectories of these test pieces. Afterwards, tests by using a high-speed camera for detecting the particle trajectories and for comparison with the calculated ones are executed. The functional efficiency of a new type of eddy current separators with static magnetic system for separation of fine nonferrous particles is tested. At first, a literature and patent research concerning types of eddy current separators with static magnetic system and their working principle is performed. Possible advantages of a static magnetic system are discussed as well. Finite element method is used for checking different arrangements of the magnetic system and for calculating the electrodynamic forces and torques with a special focus for radial acceleration on test pieces. A prototype with four promising magnetic systems is constructed, and trajectories of these test pieces are detected with a high-speed camera system. In accordance with the results from simulation, one magnetic system is identified as most suitable. For validating the discussed advantages of this static eddy current separator, beneficiation tests on two residual fractions from cable scrap processing are illustrated.
Translated title of the contributionResearch into further development of eddy current separation technique
Original languageGerman
Awarding Institution
  • Montanuniversität
  • Antrekowitsch, Helmut, Co-Supervisor (internal)
  • Flachberger, Helmut, Supervisor (internal)
Publication statusPublished - 2021

Bibliographical note

embargoed until 20-12-2025


  • eddy current separation
  • non ferrous metal separation
  • recycling

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