PROCESS AND SYSTEM FOR TOTALLY DRY ORE-DRESSING THROUGH A MAGNETIC SEPARATION UNIT

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The present invention discloses a system and a method for dry refining iron oxide ore fines and superfines in dams for waste and low-grade rejected ores, comprising a drier (9) with hot air injection, mechanical stirring means and shafts provided with blades (9.2) for disaggregating and moving the material horizontally and vertically; a number of air classifiers which are operationally connected to the outlet of the drier and classify the fine and super fine iron ore into predetermined granulometric ranges; and magnetic separators (13, 16, 19) with magnetic rollers (32, 42, 47) arranged in cascade and formed by rare earth magnets of low and/or high magnetic intensity, the magnetic rollers being arranged at a defined inclination angle.